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patch 8.1.0360: using an external diff program is slow and inflexible

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Problem:    Using an external diff program is slow and inflexible.
Solution:   Include the xdiff library. (Christian Brabandt, closes #2732)
            Use it by default.
This commit is contained in:
Bram Moolenaar
2018-09-10 17:51:58 +02:00
parent 93a1df2c20
commit e828b7621c
42 changed files with 5385 additions and 218 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
Filelist
View File

@@ -273,6 +273,20 @@ SRC_ALL = \
src/libvterm/t/92lp1640917.test \
src/libvterm/t/harness.c \
src/libvterm/t/run-test.pl \
src/xdiff/xdiff.h \
src/xdiff/xdiffi.c \
src/xdiff/xdiffi.h \
src/xdiff/xemit.c \
src/xdiff/xemit.h \
src/xdiff/xhistogram.c \
src/xdiff/xinclude.h \
src/xdiff/xmacros.h \
src/xdiff/xpatience.c \
src/xdiff/xprepare.c \
src/xdiff/xprepare.h \
src/xdiff/xtypes.h \
src/xdiff/xutils.c \
src/xdiff/xutils.h \
# source files for Unix only

9
runtime/doc/diff.txt
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@@ -39,7 +39,9 @@ The second and following arguments may also be a directory name. Vim will
then append the file name of the first argument to the directory name to find
the file.
This only works when a standard "diff" command is available. See 'diffexpr'.
By default an internal diff library will be used. When 'diffopt' or
'diffexpr' has been set an external "diff" command will be used. This only
works when such a diff program is available.
Diffs are local to the current tab page |tab-page|. You can't see diffs with
a window in another tab page. This does make it possible to have several
@@ -344,8 +346,9 @@ between file1 and file2: >
The ">" is replaced with the value of 'shellredir'.
The output of "diff" must be a normal "ed" style diff. Do NOT use a context
diff. This example explains the format that Vim expects: >
The output of "diff" must be a normal "ed" style diff or a unified diff. Do
NOT use a context diff. This example explains the format that Vim expects for
the "ed" style diff: >
1a2
> bbb

30
runtime/doc/options.txt
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@@ -2609,8 +2609,8 @@ A jump table for the options with a short description can be found at |Q_op|.
{not in Vi}
{not available when compiled without the |+diff|
feature}
Expression which is evaluated to obtain an ed-style diff file from two
versions of a file. See |diff-diffexpr|.
Expression which is evaluated to obtain a diff file (either ed-style
or unified-style) from two versions of a file. See |diff-diffexpr|.
This option cannot be set from a |modeline| or in the |sandbox|, for
security reasons.
@@ -2657,11 +2657,31 @@ A jump table for the options with a short description can be found at |Q_op|.
foldcolumn:{n} Set the 'foldcolumn' option to {n} when
starting diff mode. Without this 2 is used.
Examples: >
internal Use the internal diff library. This is
ignored when 'diffexpr' is set. *E960*
When running out of memory when writing a
buffer this item will be ignored for diffs
involving that buffer. Set the 'verbose'
option to see when this happens.
:set diffopt=filler,context:4
indent-heuristic
Use the indent heuristic for the internal
diff library.
algorithm:{text} Use the specified diff algorithm with the
internal diff engine. Currently supported
algorithms are:
myers the default algorithm
minimal spend extra time to generate the
smallest possible diff
patience patience diff algorithm
histogram histogram diff algorithm
Examples: >
:set diffopt=internal,filler,context:4
:set diffopt=
:set diffopt=filler,foldcolumn:3
:set diffopt=internal,filler,foldcolumn:3
:set diffopt-=internal " do NOT use the internal diff parser
<
*'digraph'* *'dg'* *'nodigraph'* *'nodg'*
'digraph' 'dg' boolean (default off)

53
src/Make_cyg_ming.mak
View File

@@ -166,6 +166,25 @@ else
ifndef CROSS_COMPILE
CROSS_COMPILE =
endif
# About the "sh.exe" condition, as explained by Ken Takata:
#
# If the makefile is executed with mingw32-make and sh.exe is not found in
# $PATH, then $SHELL is set to "sh.exe" (without any path). In this case,
# unix-like commands might not work and a dos-style path is needed.
#
# If the makefile is executed with mingw32-make and sh.exe IS found in $PATH,
# then $SHELL is set with the actual path of sh.exe (e.g.
# "C:/msys64/usr/bin/sh.exe"). In this case, unix-like commands can be used.
#
# If it is executed by the "make" command from cmd.exe, $SHELL is set to
# "/bin/sh". If the "make" command is in the $PATH, other unix-like commands
# might also work.
#
# If it is executed by the "make" command from a unix-like shell,
# $SHELL is set with the unix-style path (e.g. "/bin/bash").
# In this case, unix-like commands can be used.
#
ifneq (sh.exe, $(SHELL))
DEL = rm
MKDIR = mkdir -p
@@ -810,6 +829,23 @@ OBJ += $(OUTDIR)/terminal.o \
$(OUTDIR)/term_vterm.o
endif
# Include xdiff
OBJ += $(OUTDIR)/xdiffi.o \
$(OUTDIR)/xemit.o \
$(OUTDIR)/xprepare.o \
$(OUTDIR)/xutils.o \
$(OUTDIR)/xhistogram.o \
$(OUTDIR)/xpatience.o
XDIFF_DEPS = \
xdiff/xdiff.h \
xdiff/xdiffi.h \
xdiff/xemit.h \
xdiff/xinclude.h \
xdiff/xmacros.h \
xdiff/xprepare.h \
xdiff/xtypes.h \
xdiff/xutils.h
ifdef MZSCHEME
MZSCHEME_SUFFIX = Z
@@ -1055,6 +1091,23 @@ $(OUTDIR)/term_unicode.o: libvterm/src/unicode.c $(TERM_DEPS)
$(OUTDIR)/term_vterm.o: libvterm/src/vterm.c $(TERM_DEPS)
$(CCCTERM) libvterm/src/vterm.c -o $@
$(OUTDIR)/xdiffi.o: xdiff/xdiffi.c $(XDIFF_DEPS)
$(CC) -c $(CFLAGS) xdiff/xdiffi.c -o $(OUTDIR)/xdiffi.o
$(OUTDIR)/xemit.o: xdiff/xemit.c $(XDIFF_DEPS)
$(CC) -c $(CFLAGS) xdiff/xemit.c -o $(OUTDIR)/xemit.o
$(OUTDIR)/xprepare.o: xdiff/xprepare.c $(XDIFF_DEPS)
$(CC) -c $(CFLAGS) xdiff/xprepare.c -o $(OUTDIR)/xprepare.o
$(OUTDIR)/xutils.o: xdiff/xutils.c $(XDIFF_DEPS)
$(CC) -c $(CFLAGS) xdiff/xutils.c -o $(OUTDIR)/xutils.o
$(OUTDIR)/xhistogram.o: xdiff/xhistogram.c $(XDIFF_DEPS)
$(CC) -c $(CFLAGS) xdiff/xhistogram.c -o $(OUTDIR)/xhistogram.o
$(OUTDIR)/xpatience.o: xdiff/xpatience.c $(XDIFF_DEPS)
$(CC) -c $(CFLAGS) xdiff/xpatience.c -o $(OUTDIR)/xpatience.o
pathdef.c: $(INCL)
ifneq (sh.exe, $(SHELL))

41
src/Make_mvc.mak
View File

@@ -813,6 +813,24 @@ CUI_OBJ = $(OUTDIR)\iscygpty.obj
!endif
SUBSYSTEM_TOOLS = console
XDIFF_OBJ = $(OBJDIR)/xdiffi.obj \
$(OBJDIR)/xemit.obj \
$(OBJDIR)/xprepare.obj \
$(OBJDIR)/xutils.obj \
$(OBJDIR)/xhistogram.obj \
$(OBJDIR)/xpatience.obj
XDIFF_DEPS = \
xdiff/xdiff.h \
xdiff/xdiffi.h \
xdiff/xemit.h \
xdiff/xinclude.h \
xdiff/xmacros.h \
xdiff/xprepare.h \
xdiff/xtypes.h \
xdiff/xutils.h
!if "$(SUBSYSTEM_VER)" != ""
SUBSYSTEM = $(SUBSYSTEM),$(SUBSYSTEM_VER)
SUBSYSTEM_TOOLS = $(SUBSYSTEM_TOOLS),$(SUBSYSTEM_VER)
@@ -1204,12 +1222,12 @@ all: $(VIM).exe \
tee/tee.exe \
GvimExt/gvimext.dll
$(VIM).exe: $(OUTDIR) $(OBJ) $(GUI_OBJ) $(CUI_OBJ) $(OLE_OBJ) $(OLE_IDL) $(MZSCHEME_OBJ) \
$(VIM).exe: $(OUTDIR) $(OBJ) $(XDIFF_OBJ) $(GUI_OBJ) $(CUI_OBJ) $(OLE_OBJ) $(OLE_IDL) $(MZSCHEME_OBJ) \
$(LUA_OBJ) $(PERL_OBJ) $(PYTHON_OBJ) $(PYTHON3_OBJ) $(RUBY_OBJ) $(TCL_OBJ) \
$(CSCOPE_OBJ) $(TERM_OBJ) $(NETBEANS_OBJ) $(CHANNEL_OBJ) $(XPM_OBJ) \
version.c version.h
$(CC) $(CFLAGS_OUTDIR) version.c
$(link) $(LINKARGS1) -out:$(VIM).exe $(OBJ) $(GUI_OBJ) $(CUI_OBJ) $(OLE_OBJ) \
$(link) $(LINKARGS1) -out:$(VIM).exe $(OBJ) $(XDIFF_OBJ) $(GUI_OBJ) $(CUI_OBJ) $(OLE_OBJ) \
$(LUA_OBJ) $(MZSCHEME_OBJ) $(PERL_OBJ) $(PYTHON_OBJ) $(PYTHON3_OBJ) $(RUBY_OBJ) \
$(TCL_OBJ) $(CSCOPE_OBJ) $(TERM_OBJ) $(NETBEANS_OBJ) $(CHANNEL_OBJ) \
$(XPM_OBJ) $(OUTDIR)\version.obj $(LINKARGS2)
@@ -1304,6 +1322,7 @@ $(NEW_TESTS):
$(MAKE) /NOLOGO -f Make_dos.mak nolog
$(MAKE) /NOLOGO -f Make_dos.mak $@.res
$(MAKE) /NOLOGO -f Make_dos.mak report
cat messages
cd ..
###########################################################################
@@ -1344,6 +1363,24 @@ $(OUTDIR)/dict.obj: $(OUTDIR) dict.c $(INCL)
$(OUTDIR)/diff.obj: $(OUTDIR) diff.c $(INCL)
$(OUTDIR)/xdiffi.obj: $(OUTDIR) xdiff/xdiffi.c $(XDIFF_DEPS)
$(CC) $(CFLAGS_OUTDIR) xdiff/xdiffi.c
$(OUTDIR)/xemit.obj: $(OUTDIR) xdiff/xemit.c $(XDIFF_DEPS)
$(CC) $(CFLAGS_OUTDIR) xdiff/xemit.c
$(OUTDIR)/xprepare.obj: $(OUTDIR) xdiff/xprepare.c $(XDIFF_DEPS)
$(CC) $(CFLAGS_OUTDIR) xdiff/xprepare.c
$(OUTDIR)/xutils.obj: $(OUTDIR) xdiff/xutils.c $(XDIFF_DEPS)
$(CC) $(CFLAGS_OUTDIR) xdiff/xutils.c
$(OUTDIR)/xhistogram.obj: $(OUTDIR) xdiff/xhistogram.c $(XDIFF_DEPS)
$(CC) $(CFLAGS_OUTDIR) xdiff/xhistogram.c
$(OUTDIR)/xpatience.obj: $(OUTDIR) xdiff/xpatience.c $(XDIFF_DEPS)
$(CC) $(CFLAGS_OUTDIR) xdiff/xpatience.c
$(OUTDIR)/digraph.obj: $(OUTDIR) digraph.c $(INCL)
$(OUTDIR)/edit.obj: $(OUTDIR) edit.c $(INCL)

53
src/Makefile
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@@ -1400,6 +1400,32 @@ TERM_DEPS = \
TERM_SRC = libvterm/src/*.c
XDIFF_SRC = \
xdiff/xdiffi.c \
xdiff/xemit.c \
xdiff/xprepare.c \
xdiff/xutils.c \
xdiff/xhistogram.c \
xdiff/xpatience.c \
XDIFF_OBJS = \
objects/xdiffi.o \
objects/xemit.o \
objects/xprepare.o \
objects/xutils.o \
objects/xhistogram.o \
objects/xpatience.o \
XDIFF_INCL = \
xdiff/xdiff.h \
xdiff/xdiffi.h \
xdiff/xemit.h \
xdiff/xinclude.h \
xdiff/xmacros.h \
xdiff/xprepare.h \
xdiff/xtypes.h \
xdiff/xutils.h \
### Command to create dependencies based on #include "..."
### prototype headers are ignored due to -DPROTO, system
### headers #include <...> are ignored if we use the -MM option, as
@@ -1611,6 +1637,7 @@ BASIC_SRC = \
SRC = $(BASIC_SRC) \
$(GUI_SRC) \
$(TERM_SRC) \
$(XDIFF_SRC) \
$(HANGULIN_SRC) \
$(LUA_SRC) \
$(MZSCHEME_SRC) \
@@ -1728,6 +1755,7 @@ OBJ_COMMON = \
$(WORKSHOP_OBJ) \
$(NETBEANS_OBJ) \
$(CHANNEL_OBJ) \
$(XDIFF_OBJS) \
$(WSDEBUG_OBJ)
# The files included by tests are not in OBJ_COMMON.
@@ -2731,7 +2759,7 @@ SHADOWDIR = shadow
shadow: runtime pixmaps
$(MKDIR_P) $(SHADOWDIR)
cd $(SHADOWDIR); ln -s ../*.[chm] ../*.in ../*.sh ../*.xs ../*.xbm ../gui_gtk_res.xml ../toolcheck ../proto ../libvterm ../vimtutor ../gvimtutor ../install-sh ../Make_all.mak .
cd $(SHADOWDIR); ln -s ../*.[chm] ../*.in ../*.sh ../*.xs ../*.xbm ../gui_gtk_res.xml ../toolcheck ../proto ../xdiff ../libvterm ../vimtutor ../gvimtutor ../install-sh ../Make_all.mak .
mkdir $(SHADOWDIR)/auto
cd $(SHADOWDIR)/auto; ln -s ../../auto/configure .
$(MKDIR_P) $(SHADOWDIR)/po
@@ -2915,7 +2943,7 @@ objects/crypt_zip.o: crypt_zip.c
objects/dict.o: dict.c
$(CCC) -o $@ dict.c
objects/diff.o: diff.c
objects/diff.o: diff.c $(XDIFF_INCL)
$(CCC) -o $@ diff.c
objects/digraph.o: digraph.c
@@ -3229,6 +3257,27 @@ objects/term_unicode.o: libvterm/src/unicode.c $(TERM_DEPS)
objects/term_vterm.o: libvterm/src/vterm.c $(TERM_DEPS)
$(CCCTERM) -o $@ libvterm/src/vterm.c
CCCDIFF = $(CCC_NF) $(ALL_CFLAGS)
objects/xdiffi.o: xdiff/xdiffi.c $(XDIFF_INCL)
$(CCCDIFF) -o $@ xdiff/xdiffi.c
objects/xprepare.o: xdiff/xprepare.c $(XDIFF_INCL)
$(CCCDIFF) -o $@ xdiff/xprepare.c
objects/xutils.o: xdiff/xutils.c $(XDIFF_INCL)
$(CCCDIFF) -o $@ xdiff/xutils.c
objects/xemit.o: xdiff/xemit.c $(XDIFF_INCL)
$(CCCDIFF) -o $@ xdiff/xemit.c
objects/xhistogram.o: xdiff/xhistogram.c $(XDIFF_INCL)
$(CCCDIFF) -o $@ xdiff/xhistogram.c
objects/xpatience.o: xdiff/xpatience.c $(XDIFF_INCL)
$(CCCDIFF) -o $@ xdiff/xpatience.c
###############################################################################
### MacOS X installation
###

831
src/diff.c
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File diff suppressed because it is too large Load Diff

4
src/structs.h
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@@ -2433,7 +2433,9 @@ struct file_buffer
term_T *b_term; /* When not NULL this buffer is for a terminal
* window. */
#endif
#ifdef FEAT_DIFF
int b_diff_failed; // internal diff failed for this buffer
#endif
}; /* file_buffer */

20
src/testdir/dumps/Test_diff_01.dump Normal file
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@@ -0,0 +1,20 @@
| +0#0000e05#a8a8a8255@1|-+0#4040ff13#afffff255@34||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1|0+0#0000000#5fd7ff255| @33
| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|2+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|2+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|3+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|3+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|4+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|4+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|5+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|5+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|6+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|6+0#0000000#ffffff0| @33
|++0#0000e05#a8a8a8255| |+|-@1| @1|4| |l|i|n|e|s|:| |7|-@19||+1#0000000#ffffff0|++0#0000e05#a8a8a8255| |+|-@1| @1|4| |l|i|n|e|s|:| |7|-@19
| @1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
|X+3#0000000&|f|i|l|e|1| @12|1|,|1| @11|A|l@1| |X+1&&|f|i|l|e|2| @12|1|,|1| @11|A|l@1
|:+0&&> @73

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@@ -0,0 +1,20 @@
| +0#0000e05#a8a8a8255@1|0+0#0000000#5fd7ff255| @33||+1&#ffffff0| +0#0000e05#a8a8a8255@1|-+0#4040ff13#afffff255@34
| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|2+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|2+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|3+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|3+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|4+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|4+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|5+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|5+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|6+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|6+0#0000000#ffffff0| @33
|++0#0000e05#a8a8a8255| |+|-@1| @1|4| |l|i|n|e|s|:| |7|-@19||+1#0000000#ffffff0|++0#0000e05#a8a8a8255| |+|-@1| @1|4| |l|i|n|e|s|:| |7|-@19
| @1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
|X+3#0000000&|f|i|l|e|1| @12|1|,|1| @11|A|l@1| |X+1&&|f|i|l|e|2| @12|1|,|1| @11|A|l@1
|:+0&&> @73

20
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@@ -0,0 +1,20 @@
|++0#0000e05#a8a8a8255| |+|-@1| @1|4| |l|i|n|e|s|:| |1|-@19||+1#0000000#ffffff0|++0#0000e05#a8a8a8255| |+|-@1| @1|4| |l|i|n|e|s|:| |1|-@19
| @1|5+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|5+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|6+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|6+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|7+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|7+0#0000000#ffffff0| @33
| +0#0000e05#a8a8a8255@1|8+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|8+0#0000000#ffffff0| @33
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|X+3#0000000&|f|i|l|e|1| @12|0|,|0|-|1| @9|A|l@1| |X+1&&|f|i|l|e|2| @12|0|,|0|-|1| @9|A|l@1
|:+0&&> @73

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@@ -0,0 +1,20 @@
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|:+0&&> @73

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184
src/testdir/test_diffmode.vim
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@@ -1,4 +1,6 @@
" Tests for diff mode
source shared.vim
source screendump.vim
func Test_diff_fold_sync()
enew!
@@ -33,6 +35,18 @@ func Test_diff_fold_sync()
endfunc
func Test_vert_split()
set diffopt=filler
call Common_vert_split()
set diffopt&
endfunc
func Test_vert_split_internal()
set diffopt=internal,filler
call Common_vert_split()
set diffopt&
endfunc
func Common_vert_split()
" Disable the title to avoid xterm keeping the wrong one.
set notitle noicon
new
@@ -275,10 +289,8 @@ func Test_diffoff()
bwipe!
endfunc
func Test_diffopt_icase()
set diffopt=icase,foldcolumn:0
e one
func Common_icase_test()
edit one
call setline(1, ['One', 'Two', 'Three', 'Four', 'Fi#ve'])
redraw
let normattr = screenattr(1, 1)
@@ -300,32 +312,54 @@ func Test_diffopt_icase()
diffoff!
%bwipe!
endfunc
func Test_diffopt_icase()
set diffopt=icase,foldcolumn:0
call Common_icase_test()
set diffopt&
endfunc
func Test_diffopt_iwhite()
set diffopt=iwhite,foldcolumn:0
func Test_diffopt_icase_internal()
set diffopt=icase,foldcolumn:0,internal
call Common_icase_test()
set diffopt&
endfunc
e one
" Difference in trailing spaces should be ignored,
func Common_iwhite_test()
edit one
" Difference in trailing spaces and amount of spaces should be ignored,
" but not other space differences.
call setline(1, ["One \t", 'Two', 'Three', 'Four'])
call setline(1, ["One \t", 'Two', 'Three', 'one two', 'one two', 'Four'])
redraw
let normattr = screenattr(1, 1)
diffthis
botright vert new two
call setline(1, ["One\t ", "Two\t ", 'Three', ' Four'])
call setline(1, ["One\t ", "Two\t ", 'Three', 'one two', 'onetwo', ' Four'])
diffthis
redraw
call assert_equal(normattr, screenattr(1, 1))
call assert_equal(normattr, screenattr(2, 1))
call assert_equal(normattr, screenattr(3, 1))
call assert_notequal(normattr, screenattr(4, 1))
call assert_equal(normattr, screenattr(4, 1))
call assert_notequal(normattr, screenattr(5, 1))
call assert_notequal(normattr, screenattr(6, 1))
diffoff!
%bwipe!
endfunc
func Test_diffopt_iwhite()
set diffopt=iwhite,foldcolumn:0
call Common_iwhite_test()
set diffopt&
endfunc
func Test_diffopt_iwhite_internal()
set diffopt=internal,iwhite,foldcolumn:0
call Common_iwhite_test()
set diffopt&
endfunc
@@ -339,8 +373,13 @@ func Test_diffopt_context()
set diffopt=context:2
call assert_equal('+-- 2 lines: 1', foldtextresult(1))
set diffopt=internal,context:2
call assert_equal('+-- 2 lines: 1', foldtextresult(1))
set diffopt=context:1
call assert_equal('+-- 3 lines: 1', foldtextresult(1))
set diffopt=internal,context:1
call assert_equal('+-- 3 lines: 1', foldtextresult(1))
diffoff!
%bwipe!
@@ -348,7 +387,7 @@ func Test_diffopt_context()
endfunc
func Test_diffopt_horizontal()
set diffopt=horizontal
set diffopt=internal,horizontal
diffsplit
call assert_equal(&columns, winwidth(1))
@@ -362,7 +401,7 @@ func Test_diffopt_horizontal()
endfunc
func Test_diffopt_vertical()
set diffopt=vertical
set diffopt=internal,vertical
diffsplit
call assert_equal(&lines - 2, winheight(1))
@@ -376,7 +415,7 @@ func Test_diffopt_vertical()
endfunc
func Test_diffopt_hiddenoff()
set diffopt=filler,foldcolumn:0,hiddenoff
set diffopt=internal,filler,foldcolumn:0,hiddenoff
e! one
call setline(1, ['Two', 'Three'])
redraw
@@ -399,7 +438,7 @@ func Test_diffopt_hiddenoff()
endfunc
func Test_diffoff_hidden()
set diffopt=filler,foldcolumn:0
set diffopt=internal,filler,foldcolumn:0
e! one
call setline(1, ['Two', 'Three'])
redraw
@@ -629,3 +668,118 @@ func Test_diff_lastline()
bwipe!
bwipe!
endfunc
func WriteDiffFiles(list1, list2)
call writefile(a:list1, 'Xfile1')
call writefile(a:list2, 'Xfile2')
endfunc
" Verify a screendump with both the external and external diff.
func VerifyBoth(buf, dumpfile, extra)
call term_sendkeys(a:buf, ":diffupdate!\<cr>")
" trailing : for leaving the cursor on the command line
for cmd in [":set diffopt=filler" . a:extra . "\<cr>:", ":set diffopt+=internal\<cr>:"]
call term_sendkeys(a:buf, cmd)
if VerifyScreenDump(a:buf, a:dumpfile, {}, cmd =~ 'internal' ? 'internal' : 'external')
break " don't let the next iteration overwrite the "failed" file.
endif
endfor
endfunc
func Test_diff_screen()
if !CanRunVimInTerminal() || !has('menu')
return
endif
" clean up already existing swap files, just in case
call delete('.Xfile1.swp')
call delete('.Xfile2.swp')
" Test 1: Add a line in beginning of file 2
call WriteDiffFiles([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
let buf = RunVimInTerminal('-d Xfile1 Xfile2', {})
" Set autoread mode, ,so that Vim won't complain once we re-write the test
" files
call term_sendkeys(buf, ":set autoread\<cr>\<c-w>w:set autoread\<cr>\<c-w>w")
call VerifyBoth(buf, 'Test_diff_01', '')
" Test 2: Add a line in beginning of file 1
call WriteDiffFiles([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
call VerifyBoth(buf, 'Test_diff_02', '')
" Test 3: Add a line at the end of file 2
call WriteDiffFiles([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11])
call VerifyBoth(buf, 'Test_diff_03', '')
" Test 4: Add a line at the end of file 1
call WriteDiffFiles([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
call VerifyBoth(buf, 'Test_diff_04', '')
" Test 5: Add a line in the middle of file 2, remove on at the end of file 1
call WriteDiffFiles([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11], [1, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10])
call VerifyBoth(buf, 'Test_diff_05', '')
" Test 6: Add a line in the middle of file 1, remove on at the end of file 2
call WriteDiffFiles([1, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11])
call VerifyBoth(buf, 'Test_diff_06', '')
" Test 7 - 9: Test normal/patience/histogram diff algorithm
call WriteDiffFiles(['#include <stdio.h>', '', '// Frobs foo heartily', 'int frobnitz(int foo)', '{',
\ ' int i;', ' for(i = 0; i < 10; i++)', ' {', ' printf("Your answer is: ");',
\ ' printf("%d\n", foo);', ' }', '}', '', 'int fact(int n)', '{', ' if(n > 1)', ' {',
\ ' return fact(n-1) * n;', ' }', ' return 1;', '}', '', 'int main(int argc, char **argv)',
\ '{', ' frobnitz(fact(10));', '}'],
\ ['#include <stdio.h>', '', 'int fib(int n)', '{', ' if(n > 2)', ' {',
\ ' return fib(n-1) + fib(n-2);', ' }', ' return 1;', '}', '', '// Frobs foo heartily',
\ 'int frobnitz(int foo)', '{', ' int i;', ' for(i = 0; i < 10; i++)', ' {',
\ ' printf("%d\n", foo);', ' }', '}', '',
\ 'int main(int argc, char **argv)', '{', ' frobnitz(fib(10));', '}'])
call term_sendkeys(buf, ":diffupdate!\<cr>")
call term_sendkeys(buf, ":set diffopt+=internal\<cr>")
call VerifyScreenDump(buf, 'Test_diff_07', {})
call term_sendkeys(buf, ":set diffopt+=algorithm:patience\<cr>")
call VerifyScreenDump(buf, 'Test_diff_08', {})
call term_sendkeys(buf, ":set diffopt+=algorithm:histogram\<cr>")
call VerifyScreenDump(buf, 'Test_diff_09', {})
" Test 10-11: normal/indent-heuristic
call term_sendkeys(buf, ":set diffopt&vim\<cr>")
call WriteDiffFiles(['', ' def finalize(values)', '', ' values.each do |v|', ' v.finalize', ' end'],
\ ['', ' def finalize(values)', '', ' values.each do |v|', ' v.prepare', ' end', '',
\ ' values.each do |v|', ' v.finalize', ' end'])
call term_sendkeys(buf, ":diffupdate!\<cr>")
call term_sendkeys(buf, ":set diffopt+=internal\<cr>")
call VerifyScreenDump(buf, 'Test_diff_10', {})
call term_sendkeys(buf, ":set diffopt+=indent-heuristic\<cr>")
call VerifyScreenDump(buf, 'Test_diff_11', {})
" Test 12: diff the same file
call WriteDiffFiles([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
call VerifyBoth(buf, 'Test_diff_12', '')
" Test 13: diff an empty file
call WriteDiffFiles([], [])
call VerifyBoth(buf, 'Test_diff_13', '')
" Test 14: test diffopt+=icase
call WriteDiffFiles(['a', 'b', 'cd'], ['A', 'b', 'cDe'])
call VerifyBoth(buf, 'Test_diff_14', " diffopt+=filler diffopt+=icase")
" Test 15-16: test diffopt+=iwhite
call WriteDiffFiles(['int main()', '{', ' printf("Hello, World!");', ' return 0;', '}'],
\ ['int main()', '{', ' if (0)', ' {', ' printf("Hello, World!");', ' return 0;', ' }', '}'])
call term_sendkeys(buf, ":diffupdate!\<cr>")
call term_sendkeys(buf, ":set diffopt&vim diffopt+=filler diffopt+=iwhite\<cr>")
call VerifyScreenDump(buf, 'Test_diff_15', {})
call term_sendkeys(buf, ":set diffopt+=internal\<cr>")
call VerifyScreenDump(buf, 'Test_diff_16', {})
" clean up
call StopVimInTerminal(buf)
call delete('Xfile1')
call delete('Xfile2')
endfunc

2
src/version.c
View File

@@ -794,6 +794,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
360,
/**/
359,
/**/

504
src/xdiff/COPYING Normal file
View File

@@ -0,0 +1,504 @@
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Version 2.1, February 1999
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59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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That's all there is to it!

14
src/xdiff/README.txt Normal file
View File

@@ -0,0 +1,14 @@
The files in this directory come from the xdiff implementation in git.
You can find it here: https://github.com/git/git/tree/master/xdiff
The files were last updated 2018 September 10.
This is originally based on libxdiff, which can be found here:
http://www.xmailserver.org/xdiff-lib.html
The git version was used because it has been maintained and improved.
And since it's part of git it is expected to be reliable.
The code is distributed under the GNU LGPL license. It is included in the
COPYING file.
The first work for including xdiff in Vim was done by Christian Brabandt.

142
src/xdiff/xdiff.h Normal file
View File

@@ -0,0 +1,142 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#if !defined(XDIFF_H)
#define XDIFF_H
#ifdef __cplusplus
extern "C" {
#endif /* #ifdef __cplusplus */
/* xpparm_t.flags */
#define XDF_NEED_MINIMAL (1 << 0)
#define XDF_IGNORE_WHITESPACE (1 << 1)
#define XDF_IGNORE_WHITESPACE_CHANGE (1 << 2)
#define XDF_IGNORE_WHITESPACE_AT_EOL (1 << 3)
#define XDF_IGNORE_CR_AT_EOL (1 << 4)
#define XDF_WHITESPACE_FLAGS (XDF_IGNORE_WHITESPACE | \
XDF_IGNORE_WHITESPACE_CHANGE | \
XDF_IGNORE_WHITESPACE_AT_EOL | \
XDF_IGNORE_CR_AT_EOL)
#define XDF_IGNORE_BLANK_LINES (1 << 7)
#define XDF_PATIENCE_DIFF (1 << 14)
#define XDF_HISTOGRAM_DIFF (1 << 15)
#define XDF_DIFF_ALGORITHM_MASK (XDF_PATIENCE_DIFF | XDF_HISTOGRAM_DIFF)
#define XDF_DIFF_ALG(x) ((x) & XDF_DIFF_ALGORITHM_MASK)
#define XDF_INDENT_HEURISTIC (1 << 23)
/* xdemitconf_t.flags */
#define XDL_EMIT_FUNCNAMES (1 << 0)
#define XDL_EMIT_FUNCCONTEXT (1 << 2)
/* merge simplification levels */
#define XDL_MERGE_MINIMAL 0
#define XDL_MERGE_EAGER 1
#define XDL_MERGE_ZEALOUS 2
#define XDL_MERGE_ZEALOUS_ALNUM 3
/* merge favor modes */
#define XDL_MERGE_FAVOR_OURS 1
#define XDL_MERGE_FAVOR_THEIRS 2
#define XDL_MERGE_FAVOR_UNION 3
/* merge output styles */
#define XDL_MERGE_DIFF3 1
typedef struct s_mmfile {
char *ptr;
long size;
} mmfile_t;
typedef struct s_mmbuffer {
char *ptr;
long size;
} mmbuffer_t;
typedef struct s_xpparam {
unsigned long flags;
/* See Documentation/diff-options.txt. */
char **anchors;
size_t anchors_nr;
} xpparam_t;
typedef struct s_xdemitcb {
void *priv;
int (*outf)(void *, mmbuffer_t *, int);
} xdemitcb_t;
typedef long (*find_func_t)(const char *line, long line_len, char *buffer, long buffer_size, void *priv);
typedef int (*xdl_emit_hunk_consume_func_t)(long start_a, long count_a,
long start_b, long count_b,
void *cb_data);
typedef struct s_xdemitconf {
long ctxlen;
long interhunkctxlen;
unsigned long flags;
find_func_t find_func;
void *find_func_priv;
xdl_emit_hunk_consume_func_t hunk_func;
} xdemitconf_t;
typedef struct s_bdiffparam {
long bsize;
} bdiffparam_t;
#define xdl_malloc(x) malloc(x)
#define xdl_free(ptr) free(ptr)
#define xdl_realloc(ptr,x) realloc(ptr,x)
void *xdl_mmfile_first(mmfile_t *mmf, long *size);
long xdl_mmfile_size(mmfile_t *mmf);
int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdemitconf_t const *xecfg, xdemitcb_t *ecb);
typedef struct s_xmparam {
xpparam_t xpp;
int marker_size;
int level;
int favor;
int style;
const char *ancestor; /* label for orig */
const char *file1; /* label for mf1 */
const char *file2; /* label for mf2 */
} xmparam_t;
#define DEFAULT_CONFLICT_MARKER_SIZE 7
int xdl_merge(mmfile_t *orig, mmfile_t *mf1, mmfile_t *mf2,
xmparam_t const *xmp, mmbuffer_t *result);
#ifdef __cplusplus
}
#endif /* #ifdef __cplusplus */
#endif /* #if !defined(XDIFF_H) */

1043
src/xdiff/xdiffi.c Normal file
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64
src/xdiff/xdiffi.h Normal file
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/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#if !defined(XDIFFI_H)
#define XDIFFI_H
typedef struct s_diffdata {
long nrec;
unsigned long const *ha;
long *rindex;
char *rchg;
} diffdata_t;
typedef struct s_xdalgoenv {
long mxcost;
long snake_cnt;
long heur_min;
} xdalgoenv_t;
typedef struct s_xdchange {
struct s_xdchange *next;
long i1, i2;
long chg1, chg2;
int ignore;
} xdchange_t;
int xdl_recs_cmp(diffdata_t *dd1, long off1, long lim1,
diffdata_t *dd2, long off2, long lim2,
long *kvdf, long *kvdb, int need_min, xdalgoenv_t *xenv);
int xdl_do_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdfenv_t *xe);
int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags);
int xdl_build_script(xdfenv_t *xe, xdchange_t **xscr);
void xdl_free_script(xdchange_t *xscr);
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg);
int xdl_do_patience_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdfenv_t *env);
int xdl_do_histogram_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdfenv_t *env);
#endif /* #if !defined(XDIFFI_H) */

312
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/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#include "xinclude.h"
static long xdl_get_rec(xdfile_t *xdf, long ri, char const **rec) {
*rec = xdf->recs[ri]->ptr;
return xdf->recs[ri]->size;
}
static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb) {
long size, psize = strlen(pre);
char const *rec;
size = xdl_get_rec(xdf, ri, &rec);
if (xdl_emit_diffrec(rec, size, pre, psize, ecb) < 0) {
return -1;
}
return 0;
}
/*
* Starting at the passed change atom, find the latest change atom to be included
* inside the differential hunk according to the specified configuration.
* Also advance xscr if the first changes must be discarded.
*/
xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg)
{
xdchange_t *xch, *xchp, *lxch;
long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
long max_ignorable = xecfg->ctxlen;
unsigned long ignored = 0; /* number of ignored blank lines */
/* remove ignorable changes that are too far before other changes */
for (xchp = *xscr; xchp && xchp->ignore; xchp = xchp->next) {
xch = xchp->next;
if (xch == NULL ||
xch->i1 - (xchp->i1 + xchp->chg1) >= max_ignorable)
*xscr = xch;
}
if (*xscr == NULL)
return NULL;
lxch = *xscr;
for (xchp = *xscr, xch = xchp->next; xch; xchp = xch, xch = xch->next) {
long distance = xch->i1 - (xchp->i1 + xchp->chg1);
if (distance > max_common)
break;
if (distance < max_ignorable && (!xch->ignore || lxch == xchp)) {
lxch = xch;
ignored = 0;
} else if (distance < max_ignorable && xch->ignore) {
ignored += xch->chg2;
} else if (lxch != xchp &&
xch->i1 + (long)ignored - (lxch->i1 + lxch->chg1) > max_common) {
break;
} else if (!xch->ignore) {
lxch = xch;
ignored = 0;
} else {
ignored += xch->chg2;
}
}
return lxch;
}
static long def_ff(const char *rec, long len, char *buf, long sz, void *priv UNUSED)
{
if (len > 0 &&
(isalpha((unsigned char)*rec) || /* identifier? */
*rec == '_' || /* also identifier? */
*rec == '$')) { /* identifiers from VMS and other esoterico */
if (len > sz)
len = sz;
while (0 < len && isspace((unsigned char)rec[len - 1]))
len--;
memcpy(buf, rec, len);
return len;
}
return -1;
}
static long match_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri,
char *buf, long sz)
{
const char *rec;
long len = xdl_get_rec(xdf, ri, &rec);
if (!xecfg->find_func)
return def_ff(rec, len, buf, sz, xecfg->find_func_priv);
return xecfg->find_func(rec, len, buf, sz, xecfg->find_func_priv);
}
static int is_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri)
{
char dummy[1];
return match_func_rec(xdf, xecfg, ri, dummy, sizeof(dummy)) >= 0;
}
struct func_line {
long len;
char buf[80];
};
static long get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg,
struct func_line *func_line, long start, long limit)
{
long l, size, step = (start > limit) ? -1 : 1;
char *buf, dummy[1];
buf = func_line ? func_line->buf : dummy;
size = func_line ? sizeof(func_line->buf) : sizeof(dummy);
for (l = start; l != limit && 0 <= l && l < xe->xdf1.nrec; l += step) {
long len = match_func_rec(&xe->xdf1, xecfg, l, buf, size);
if (len >= 0) {
if (func_line)
func_line->len = len;
return l;
}
}
return -1;
}
static int is_empty_rec(xdfile_t *xdf, long ri)
{
const char *rec;
long len = xdl_get_rec(xdf, ri, &rec);
while (len > 0 && XDL_ISSPACE(*rec)) {
rec++;
len--;
}
return !len;
}
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg) {
long s1, s2, e1, e2, lctx;
xdchange_t *xch, *xche;
long funclineprev = -1;
struct func_line func_line = { 0 };
for (xch = xscr; xch; xch = xche->next) {
xche = xdl_get_hunk(&xch, xecfg);
if (!xch)
break;
s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
long fs1, i1 = xch->i1;
/* Appended chunk? */
if (i1 >= xe->xdf1.nrec) {
long i2 = xch->i2;
/*
* We don't need additional context if
* a whole function was added.
*/
while (i2 < xe->xdf2.nrec) {
if (is_func_rec(&xe->xdf2, xecfg, i2))
goto post_context_calculation;
i2++;
}
/*
* Otherwise get more context from the
* pre-image.
*/
i1 = xe->xdf1.nrec - 1;
}
fs1 = get_func_line(xe, xecfg, NULL, i1, -1);
while (fs1 > 0 && !is_empty_rec(&xe->xdf1, fs1 - 1) &&
!is_func_rec(&xe->xdf1, xecfg, fs1 - 1))
fs1--;
if (fs1 < 0)
fs1 = 0;
if (fs1 < s1) {
s2 -= s1 - fs1;
s1 = fs1;
}
}
post_context_calculation:
lctx = xecfg->ctxlen;
lctx = XDL_MIN(lctx, xe->xdf1.nrec - (xche->i1 + xche->chg1));
lctx = XDL_MIN(lctx, xe->xdf2.nrec - (xche->i2 + xche->chg2));
e1 = xche->i1 + xche->chg1 + lctx;
e2 = xche->i2 + xche->chg2 + lctx;
if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
long fe1 = get_func_line(xe, xecfg, NULL,
xche->i1 + xche->chg1,
xe->xdf1.nrec);
while (fe1 > 0 && is_empty_rec(&xe->xdf1, fe1 - 1))
fe1--;
if (fe1 < 0)
fe1 = xe->xdf1.nrec;
if (fe1 > e1) {
e2 += fe1 - e1;
e1 = fe1;
}
/*
* Overlap with next change? Then include it
* in the current hunk and start over to find
* its new end.
*/
if (xche->next) {
long l = XDL_MIN(xche->next->i1,
xe->xdf1.nrec - 1);
if (l - xecfg->ctxlen <= e1 ||
get_func_line(xe, xecfg, NULL, l, e1) < 0) {
xche = xche->next;
goto post_context_calculation;
}
}
}
/*
* Emit current hunk header.
*/
if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
get_func_line(xe, xecfg, &func_line,
s1 - 1, funclineprev);
funclineprev = s1 - 1;
}
if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
func_line.buf, func_line.len, ecb) < 0)
return -1;
/*
* Emit pre-context.
*/
for (; s2 < xch->i2; s2++)
if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
for (s1 = xch->i1, s2 = xch->i2;; xch = xch->next) {
/*
* Merge previous with current change atom.
*/
for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++)
if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
/*
* Removes lines from the first file.
*/
for (s1 = xch->i1; s1 < xch->i1 + xch->chg1; s1++)
if (xdl_emit_record(&xe->xdf1, s1, "-", ecb) < 0)
return -1;
/*
* Adds lines from the second file.
*/
for (s2 = xch->i2; s2 < xch->i2 + xch->chg2; s2++)
if (xdl_emit_record(&xe->xdf2, s2, "+", ecb) < 0)
return -1;
if (xch == xche)
break;
s1 = xch->i1 + xch->chg1;
s2 = xch->i2 + xch->chg2;
}
/*
* Emit post-context.
*/
for (s2 = xche->i2 + xche->chg2; s2 < e2; s2++)
if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
}
return 0;
}

36
src/xdiff/xemit.h Normal file
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@@ -0,0 +1,36 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#if !defined(XEMIT_H)
#define XEMIT_H
typedef int (*emit_func_t)(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg);
xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg);
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg);
#endif /* #if !defined(XEMIT_H) */

386
src/xdiff/xhistogram.c Normal file
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@@ -0,0 +1,386 @@
/*
* Copyright (C) 2010, Google Inc.
* and other copyright owners as documented in JGit's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "xinclude.h"
#include "xtypes.h"
#include "xdiff.h"
#define MAX_PTR INT_MAX
#define MAX_CNT INT_MAX
#define LINE_END(n) (line##n + count##n - 1)
#define LINE_END_PTR(n) (*line##n + *count##n - 1)
struct histindex {
struct record {
unsigned int ptr, cnt;
struct record *next;
} **records, /* an occurrence */
**line_map; /* map of line to record chain */
chastore_t rcha;
unsigned int *next_ptrs;
unsigned int table_bits,
records_size,
line_map_size;
unsigned int max_chain_length,
key_shift,
ptr_shift;
unsigned int cnt,
has_common;
xdfenv_t *env;
xpparam_t const *xpp;
};
struct region {
unsigned int begin1, end1;
unsigned int begin2, end2;
};
#define LINE_MAP(i, a) (i->line_map[(a) - i->ptr_shift])
#define NEXT_PTR(index, ptr) \
(index->next_ptrs[(ptr) - index->ptr_shift])
#define CNT(index, ptr) \
((LINE_MAP(index, ptr))->cnt)
#define REC(env, s, l) \
(env->xdf##s.recs[l - 1])
static int cmp_recs(xpparam_t const *xpp,
xrecord_t *r1, xrecord_t *r2)
{
return r1->ha == r2->ha &&
xdl_recmatch(r1->ptr, r1->size, r2->ptr, r2->size,
xpp->flags);
}
#define CMP_ENV(xpp, env, s1, l1, s2, l2) \
(cmp_recs(xpp, REC(env, s1, l1), REC(env, s2, l2)))
#define CMP(i, s1, l1, s2, l2) \
(cmp_recs(i->xpp, REC(i->env, s1, l1), REC(i->env, s2, l2)))
#define TABLE_HASH(index, side, line) \
XDL_HASHLONG((REC(index->env, side, line))->ha, index->table_bits)
static int scanA(struct histindex *index, int line1, int count1)
{
int ptr, tbl_idx;
unsigned int chain_len;
struct record **rec_chain, *rec;
for (ptr = LINE_END(1); line1 <= ptr; ptr--) {
tbl_idx = TABLE_HASH(index, 1, ptr);
rec_chain = index->records + tbl_idx;
rec = *rec_chain;
chain_len = 0;
while (rec) {
if (CMP(index, 1, rec->ptr, 1, ptr)) {
/*
* ptr is identical to another element. Insert
* it onto the front of the existing element
* chain.
*/
NEXT_PTR(index, ptr) = rec->ptr;
rec->ptr = ptr;
/* cap rec->cnt at MAX_CNT */
rec->cnt = XDL_MIN(MAX_CNT, rec->cnt + 1);
LINE_MAP(index, ptr) = rec;
goto continue_scan;
}
rec = rec->next;
chain_len++;
}
if (chain_len == index->max_chain_length)
return -1;
/*
* This is the first time we have ever seen this particular
* element in the sequence. Construct a new chain for it.
*/
if (!(rec = xdl_cha_alloc(&index->rcha)))
return -1;
rec->ptr = ptr;
rec->cnt = 1;
rec->next = *rec_chain;
*rec_chain = rec;
LINE_MAP(index, ptr) = rec;
continue_scan:
; /* no op */
}
return 0;
}
static int try_lcs(struct histindex *index, struct region *lcs, int b_ptr,
int line1, int count1, int line2, int count2)
{
unsigned int b_next = b_ptr + 1;
struct record *rec = index->records[TABLE_HASH(index, 2, b_ptr)];
unsigned int as, ae, bs, be, np, rc;
int should_break;
for (; rec; rec = rec->next) {
if (rec->cnt > index->cnt) {
if (!index->has_common)
index->has_common = CMP(index, 1, rec->ptr, 2, b_ptr);
continue;
}
as = rec->ptr;
if (!CMP(index, 1, as, 2, b_ptr))
continue;
index->has_common = 1;
for (;;) {
should_break = 0;
np = NEXT_PTR(index, as);
bs = b_ptr;
ae = as;
be = bs;
rc = rec->cnt;
while (line1 < (int)as && line2 < (int)bs
&& CMP(index, 1, as - 1, 2, bs - 1)) {
as--;
bs--;
if (1 < rc)
rc = XDL_MIN(rc, CNT(index, as));
}
while ((int)ae < LINE_END(1) && (int)be < LINE_END(2)
&& CMP(index, 1, ae + 1, 2, be + 1)) {
ae++;
be++;
if (1 < rc)
rc = XDL_MIN(rc, CNT(index, ae));
}
if (b_next <= be)
b_next = be + 1;
if (lcs->end1 - lcs->begin1 < ae - as || rc < index->cnt) {
lcs->begin1 = as;
lcs->begin2 = bs;
lcs->end1 = ae;
lcs->end2 = be;
index->cnt = rc;
}
if (np == 0)
break;
while (np <= ae) {
np = NEXT_PTR(index, np);
if (np == 0) {
should_break = 1;
break;
}
}
if (should_break)
break;
as = np;
}
}
return b_next;
}
static int fall_back_to_classic_diff(xpparam_t const *xpp, xdfenv_t *env,
int line1, int count1, int line2, int count2)
{
xpparam_t xpparam;
xpparam.flags = xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
return xdl_fall_back_diff(env, &xpparam,
line1, count1, line2, count2);
}
static inline void free_index(struct histindex *index)
{
xdl_free(index->records);
xdl_free(index->line_map);
xdl_free(index->next_ptrs);
xdl_cha_free(&index->rcha);
}
static int find_lcs(xpparam_t const *xpp, xdfenv_t *env,
struct region *lcs,
int line1, int count1, int line2, int count2)
{
int b_ptr;
int sz, ret = -1;
struct histindex index;
memset(&index, 0, sizeof(index));
index.env = env;
index.xpp = xpp;
index.records = NULL;
index.line_map = NULL;
/* in case of early xdl_cha_free() */
index.rcha.head = NULL;
index.table_bits = xdl_hashbits(count1);
sz = index.records_size = 1 << index.table_bits;
sz *= sizeof(struct record *);
if (!(index.records = (struct record **) xdl_malloc(sz)))
goto cleanup;
memset(index.records, 0, sz);
sz = index.line_map_size = count1;
sz *= sizeof(struct record *);
if (!(index.line_map = (struct record **) xdl_malloc(sz)))
goto cleanup;
memset(index.line_map, 0, sz);
sz = index.line_map_size;
sz *= sizeof(unsigned int);
if (!(index.next_ptrs = (unsigned int *) xdl_malloc(sz)))
goto cleanup;
memset(index.next_ptrs, 0, sz);
/* lines / 4 + 1 comes from xprepare.c:xdl_prepare_ctx() */
if (xdl_cha_init(&index.rcha, sizeof(struct record), count1 / 4 + 1) < 0)
goto cleanup;
index.ptr_shift = line1;
index.max_chain_length = 64;
if (scanA(&index, line1, count1))
goto cleanup;
index.cnt = index.max_chain_length + 1;
for (b_ptr = line2; b_ptr <= LINE_END(2); )
b_ptr = try_lcs(&index, lcs, b_ptr, line1, count1, line2, count2);
if (index.has_common && index.max_chain_length < index.cnt)
ret = 1;
else
ret = 0;
cleanup:
free_index(&index);
return ret;
}
static int histogram_diff(xpparam_t const *xpp, xdfenv_t *env,
int line1, int count1, int line2, int count2)
{
struct region lcs;
int lcs_found;
int result;
redo:
result = -1;
if (count1 <= 0 && count2 <= 0)
return 0;
if (LINE_END(1) >= MAX_PTR)
return -1;
if (!count1) {
while(count2--)
env->xdf2.rchg[line2++ - 1] = 1;
return 0;
} else if (!count2) {
while(count1--)
env->xdf1.rchg[line1++ - 1] = 1;
return 0;
}
memset(&lcs, 0, sizeof(lcs));
lcs_found = find_lcs(xpp, env, &lcs, line1, count1, line2, count2);
if (lcs_found < 0)
goto out;
else if (lcs_found)
result = fall_back_to_classic_diff(xpp, env, line1, count1, line2, count2);
else {
if (lcs.begin1 == 0 && lcs.begin2 == 0) {
while (count1--)
env->xdf1.rchg[line1++ - 1] = 1;
while (count2--)
env->xdf2.rchg[line2++ - 1] = 1;
result = 0;
} else {
result = histogram_diff(xpp, env,
line1, lcs.begin1 - line1,
line2, lcs.begin2 - line2);
if (result)
goto out;
/*
* result = histogram_diff(xpp, env,
* lcs.end1 + 1, LINE_END(1) - lcs.end1,
* lcs.end2 + 1, LINE_END(2) - lcs.end2);
* but let's optimize tail recursion ourself:
*/
count1 = LINE_END(1) - lcs.end1;
line1 = lcs.end1 + 1;
count2 = LINE_END(2) - lcs.end2;
line2 = lcs.end2 + 1;
goto redo;
}
}
out:
return result;
}
int xdl_do_histogram_diff(mmfile_t *file1, mmfile_t *file2,
xpparam_t const *xpp, xdfenv_t *env)
{
if (xdl_prepare_env(file1, file2, xpp, env) < 0)
return -1;
return histogram_diff(xpp, env,
env->xdf1.dstart + 1, env->xdf1.dend - env->xdf1.dstart + 1,
env->xdf2.dstart + 1, env->xdf2.dend - env->xdf2.dstart + 1);
}

61
src/xdiff/xinclude.h Normal file
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@@ -0,0 +1,61 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
/* defines HAVE_ATTRIBUTE_UNUSED */
#ifdef HAVE_CONFIG_H
# include "../auto/config.h"
#endif
/* Mark unused function arguments with UNUSED, so that gcc -Wunused-parameter
* can be used to check for mistakes. */
#ifdef HAVE_ATTRIBUTE_UNUSED
# define UNUSED __attribute__((unused))
#else
# define UNUSED
#endif
#if defined(_MSC_VER)
# define inline __inline
#endif
#if !defined(XINCLUDE_H)
#define XINCLUDE_H
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#if !defined(_WIN32)
#include <unistd.h>
#endif
#include <string.h>
#include <limits.h>
#include "xmacros.h"
#include "xdiff.h"
#include "xtypes.h"
#include "xutils.h"
#include "xprepare.h"
#include "xdiffi.h"
#include "xemit.h"
#endif /* #if !defined(XINCLUDE_H) */

54
src/xdiff/xmacros.h Normal file
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@@ -0,0 +1,54 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#if !defined(XMACROS_H)
#define XMACROS_H
#define XDL_MIN(a, b) ((a) < (b) ? (a): (b))
#define XDL_MAX(a, b) ((a) > (b) ? (a): (b))
#define XDL_ABS(v) ((v) >= 0 ? (v): -(v))
#define XDL_ISDIGIT(c) ((c) >= '0' && (c) <= '9')
#define XDL_ISSPACE(c) (isspace((unsigned char)(c)))
#define XDL_ADDBITS(v,b) ((v) + ((v) >> (b)))
#define XDL_MASKBITS(b) ((1UL << (b)) - 1)
#define XDL_HASHLONG(v,b) (XDL_ADDBITS((unsigned long)(v), b) & XDL_MASKBITS(b))
#define XDL_PTRFREE(p) do { if (p) { xdl_free(p); (p) = NULL; } } while (0)
#define XDL_LE32_PUT(p, v) \
do { \
unsigned char *__p = (unsigned char *) (p); \
*__p++ = (unsigned char) (v); \
*__p++ = (unsigned char) ((v) >> 8); \
*__p++ = (unsigned char) ((v) >> 16); \
*__p = (unsigned char) ((v) >> 24); \
} while (0)
#define XDL_LE32_GET(p, v) \
do { \
unsigned char const *__p = (unsigned char const *) (p); \
(v) = (unsigned long) __p[0] | ((unsigned long) __p[1]) << 8 | \
((unsigned long) __p[2]) << 16 | ((unsigned long) __p[3]) << 24; \
} while (0)
#endif /* #if !defined(XMACROS_H) */

390
src/xdiff/xpatience.c Normal file
View File

@@ -0,0 +1,390 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003-2016 Davide Libenzi, Johannes E. Schindelin
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#include "xinclude.h"
#include "xtypes.h"
#include "xdiff.h"
/*
* The basic idea of patience diff is to find lines that are unique in
* both files. These are intuitively the ones that we want to see as
* common lines.
*
* The maximal ordered sequence of such line pairs (where ordered means
* that the order in the sequence agrees with the order of the lines in
* both files) naturally defines an initial set of common lines.
*
* Now, the algorithm tries to extend the set of common lines by growing
* the line ranges where the files have identical lines.
*
* Between those common lines, the patience diff algorithm is applied
* recursively, until no unique line pairs can be found; these line ranges
* are handled by the well-known Myers algorithm.
*/
#define NON_UNIQUE ULONG_MAX
/*
* This is a hash mapping from line hash to line numbers in the first and
* second file.
*/
struct hashmap {
int nr, alloc;
struct entry {
unsigned long hash;
/*
* 0 = unused entry, 1 = first line, 2 = second, etc.
* line2 is NON_UNIQUE if the line is not unique
* in either the first or the second file.
*/
unsigned long line1, line2;
/*
* "next" & "previous" are used for the longest common
* sequence;
* initially, "next" reflects only the order in file1.
*/
struct entry *next, *previous;
/*
* If 1, this entry can serve as an anchor. See
* Documentation/diff-options.txt for more information.
*/
unsigned anchor : 1;
} *entries, *first, *last;
/* were common records found? */
unsigned long has_matches;
mmfile_t *file1, *file2;
xdfenv_t *env;
xpparam_t const *xpp;
};
static int is_anchor(xpparam_t const *xpp, const char *line)
{
size_t i;
for (i = 0; i < xpp->anchors_nr; i++) {
if (!strncmp(line, xpp->anchors[i], strlen(xpp->anchors[i])))
return 1;
}
return 0;
}
/* The argument "pass" is 1 for the first file, 2 for the second. */
static void insert_record(xpparam_t const *xpp, int line, struct hashmap *map,
int pass)
{
xrecord_t **records = pass == 1 ?
map->env->xdf1.recs : map->env->xdf2.recs;
xrecord_t *record = records[line - 1], *other;
/*
* After xdl_prepare_env() (or more precisely, due to
* xdl_classify_record()), the "ha" member of the records (AKA lines)
* is _not_ the hash anymore, but a linearized version of it. In
* other words, the "ha" member is guaranteed to start with 0 and
* the second record's ha can only be 0 or 1, etc.
*
* So we multiply ha by 2 in the hope that the hashing was
* "unique enough".
*/
int index = (int)((record->ha << 1) % map->alloc);
while (map->entries[index].line1) {
other = map->env->xdf1.recs[map->entries[index].line1 - 1];
if (map->entries[index].hash != record->ha ||
!xdl_recmatch(record->ptr, record->size,
other->ptr, other->size,
map->xpp->flags)) {
if (++index >= map->alloc)
index = 0;
continue;
}
if (pass == 2)
map->has_matches = 1;
if (pass == 1 || map->entries[index].line2)
map->entries[index].line2 = NON_UNIQUE;
else
map->entries[index].line2 = line;
return;
}
if (pass == 2)
return;
map->entries[index].line1 = line;
map->entries[index].hash = record->ha;
map->entries[index].anchor = is_anchor(xpp, map->env->xdf1.recs[line - 1]->ptr);
if (!map->first)
map->first = map->entries + index;
if (map->last) {
map->last->next = map->entries + index;
map->entries[index].previous = map->last;
}
map->last = map->entries + index;
map->nr++;
}
/*
* This function has to be called for each recursion into the inter-hunk
* parts, as previously non-unique lines can become unique when being
* restricted to a smaller part of the files.
*
* It is assumed that env has been prepared using xdl_prepare().
*/
static int fill_hashmap(mmfile_t *file1, mmfile_t *file2,
xpparam_t const *xpp, xdfenv_t *env,
struct hashmap *result,
int line1, int count1, int line2, int count2)
{
result->file1 = file1;
result->file2 = file2;
result->xpp = xpp;
result->env = env;
/* We know exactly how large we want the hash map */
result->alloc = count1 * 2;
result->entries = (struct entry *)
xdl_malloc(result->alloc * sizeof(struct entry));
if (!result->entries)
return -1;
memset(result->entries, 0, result->alloc * sizeof(struct entry));
/* First, fill with entries from the first file */
while (count1--)
insert_record(xpp, line1++, result, 1);
/* Then search for matches in the second file */
while (count2--)
insert_record(xpp, line2++, result, 2);
return 0;
}
/*
* Find the longest sequence with a smaller last element (meaning a smaller
* line2, as we construct the sequence with entries ordered by line1).
*/
static int binary_search(struct entry **sequence, int longest,
struct entry *entry)
{
int left = -1, right = longest;
while (left + 1 < right) {
int middle = left + (right - left) / 2;
/* by construction, no two entries can be equal */
if (sequence[middle]->line2 > entry->line2)
right = middle;
else
left = middle;
}
/* return the index in "sequence", _not_ the sequence length */
return left;
}
/*
* The idea is to start with the list of common unique lines sorted by
* the order in file1. For each of these pairs, the longest (partial)
* sequence whose last element's line2 is smaller is determined.
*
* For efficiency, the sequences are kept in a list containing exactly one
* item per sequence length: the sequence with the smallest last
* element (in terms of line2).
*/
static struct entry *find_longest_common_sequence(struct hashmap *map)
{
struct entry **sequence = xdl_malloc(map->nr * sizeof(struct entry *));
int longest = 0, i;
struct entry *entry;
/*
* If not -1, this entry in sequence must never be overridden.
* Therefore, overriding entries before this has no effect, so
* do not do that either.
*/
int anchor_i = -1;
for (entry = map->first; entry; entry = entry->next) {
if (!entry->line2 || entry->line2 == NON_UNIQUE)
continue;
i = binary_search(sequence, longest, entry);
entry->previous = i < 0 ? NULL : sequence[i];
++i;
if (i <= anchor_i)
continue;
sequence[i] = entry;
if (entry->anchor) {
anchor_i = i;
longest = anchor_i + 1;
} else if (i == longest) {
longest++;
}
}
/* No common unique lines were found */
if (!longest) {
xdl_free(sequence);
return NULL;
}
/* Iterate starting at the last element, adjusting the "next" members */
entry = sequence[longest - 1];
entry->next = NULL;
while (entry->previous) {
entry->previous->next = entry;
entry = entry->previous;
}
xdl_free(sequence);
return entry;
}
static int match(struct hashmap *map, int line1, int line2)
{
xrecord_t *record1 = map->env->xdf1.recs[line1 - 1];
xrecord_t *record2 = map->env->xdf2.recs[line2 - 1];
return xdl_recmatch(record1->ptr, record1->size,
record2->ptr, record2->size, map->xpp->flags);
}
static int patience_diff(mmfile_t *file1, mmfile_t *file2,
xpparam_t const *xpp, xdfenv_t *env,
int line1, int count1, int line2, int count2);
static int walk_common_sequence(struct hashmap *map, struct entry *first,
int line1, int count1, int line2, int count2)
{
int end1 = line1 + count1, end2 = line2 + count2;
int next1, next2;
for (;;) {
/* Try to grow the line ranges of common lines */
if (first) {
next1 = first->line1;
next2 = first->line2;
while (next1 > line1 && next2 > line2 &&
match(map, next1 - 1, next2 - 1)) {
next1--;
next2--;
}
} else {
next1 = end1;
next2 = end2;
}
while (line1 < next1 && line2 < next2 &&
match(map, line1, line2)) {
line1++;
line2++;
}
/* Recurse */
if (next1 > line1 || next2 > line2) {
struct hashmap submap;
memset(&submap, 0, sizeof(submap));
if (patience_diff(map->file1, map->file2,
map->xpp, map->env,
line1, next1 - line1,
line2, next2 - line2))
return -1;
}
if (!first)
return 0;
while (first->next &&
first->next->line1 == first->line1 + 1 &&
first->next->line2 == first->line2 + 1)
first = first->next;
line1 = first->line1 + 1;
line2 = first->line2 + 1;
first = first->next;
}
}
static int fall_back_to_classic_diff(struct hashmap *map,
int line1, int count1, int line2, int count2)
{
xpparam_t xpp;
xpp.flags = map->xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
return xdl_fall_back_diff(map->env, &xpp,
line1, count1, line2, count2);
}
/*
* Recursively find the longest common sequence of unique lines,
* and if none was found, ask xdl_do_diff() to do the job.
*
* This function assumes that env was prepared with xdl_prepare_env().
*/
static int patience_diff(mmfile_t *file1, mmfile_t *file2,
xpparam_t const *xpp, xdfenv_t *env,
int line1, int count1, int line2, int count2)
{
struct hashmap map;
struct entry *first;
int result = 0;
/* trivial case: one side is empty */
if (!count1) {
while(count2--)
env->xdf2.rchg[line2++ - 1] = 1;
return 0;
} else if (!count2) {
while(count1--)
env->xdf1.rchg[line1++ - 1] = 1;
return 0;
}
memset(&map, 0, sizeof(map));
if (fill_hashmap(file1, file2, xpp, env, &map,
line1, count1, line2, count2))
return -1;
/* are there any matching lines at all? */
if (!map.has_matches) {
while(count1--)
env->xdf1.rchg[line1++ - 1] = 1;
while(count2--)
env->xdf2.rchg[line2++ - 1] = 1;
xdl_free(map.entries);
return 0;
}
first = find_longest_common_sequence(&map);
if (first)
result = walk_common_sequence(&map, first,
line1, count1, line2, count2);
else
result = fall_back_to_classic_diff(&map,
line1, count1, line2, count2);
xdl_free(map.entries);
return result;
}
int xdl_do_patience_diff(mmfile_t *file1, mmfile_t *file2,
xpparam_t const *xpp, xdfenv_t *env)
{
if (xdl_prepare_env(file1, file2, xpp, env) < 0)
return -1;
/* environment is cleaned up in xdl_diff() */
return patience_diff(file1, file2, xpp, env,
1, env->xdf1.nrec, 1, env->xdf2.nrec);
}

483
src/xdiff/xprepare.c Normal file
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@@ -0,0 +1,483 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#include "xinclude.h"
#define XDL_KPDIS_RUN 4
#define XDL_MAX_EQLIMIT 1024
#define XDL_SIMSCAN_WINDOW 100
#define XDL_GUESS_NLINES1 256
#define XDL_GUESS_NLINES2 20
typedef struct s_xdlclass {
struct s_xdlclass *next;
unsigned long ha;
char const *line;
long size;
long idx;
long len1, len2;
} xdlclass_t;
typedef struct s_xdlclassifier {
unsigned int hbits;
long hsize;
xdlclass_t **rchash;
chastore_t ncha;
xdlclass_t **rcrecs;
long alloc;
long count;
long flags;
} xdlclassifier_t;
static int xdl_init_classifier(xdlclassifier_t *cf, long size, long flags);
static void xdl_free_classifier(xdlclassifier_t *cf);
static int xdl_classify_record(unsigned int pass, xdlclassifier_t *cf, xrecord_t **rhash,
unsigned int hbits, xrecord_t *rec);
static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_t const *xpp,
xdlclassifier_t *cf, xdfile_t *xdf);
static void xdl_free_ctx(xdfile_t *xdf);
static int xdl_clean_mmatch(char const *dis, long i, long s, long e);
static int xdl_cleanup_records(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xdf2);
static int xdl_trim_ends(xdfile_t *xdf1, xdfile_t *xdf2);
static int xdl_optimize_ctxs(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xdf2);
static int xdl_init_classifier(xdlclassifier_t *cf, long size, long flags) {
cf->flags = flags;
cf->hbits = xdl_hashbits((unsigned int) size);
cf->hsize = 1 << cf->hbits;
if (xdl_cha_init(&cf->ncha, sizeof(xdlclass_t), size / 4 + 1) < 0) {
return -1;
}
if (!(cf->rchash = (xdlclass_t **) xdl_malloc(cf->hsize * sizeof(xdlclass_t *)))) {
xdl_cha_free(&cf->ncha);
return -1;
}
memset(cf->rchash, 0, cf->hsize * sizeof(xdlclass_t *));
cf->alloc = size;
if (!(cf->rcrecs = (xdlclass_t **) xdl_malloc(cf->alloc * sizeof(xdlclass_t *)))) {
xdl_free(cf->rchash);
xdl_cha_free(&cf->ncha);
return -1;
}
cf->count = 0;
return 0;
}
static void xdl_free_classifier(xdlclassifier_t *cf) {
xdl_free(cf->rcrecs);
xdl_free(cf->rchash);
xdl_cha_free(&cf->ncha);
}
static int xdl_classify_record(unsigned int pass, xdlclassifier_t *cf, xrecord_t **rhash,
unsigned int hbits, xrecord_t *rec) {
long hi;
char const *line;
xdlclass_t *rcrec;
xdlclass_t **rcrecs;
line = rec->ptr;
hi = (long) XDL_HASHLONG(rec->ha, cf->hbits);
for (rcrec = cf->rchash[hi]; rcrec; rcrec = rcrec->next)
if (rcrec->ha == rec->ha &&
xdl_recmatch(rcrec->line, rcrec->size,
rec->ptr, rec->size, cf->flags))
break;
if (!rcrec) {
if (!(rcrec = xdl_cha_alloc(&cf->ncha))) {
return -1;
}
rcrec->idx = cf->count++;
if (cf->count > cf->alloc) {
cf->alloc *= 2;
if (!(rcrecs = (xdlclass_t **) xdl_realloc(cf->rcrecs, cf->alloc * sizeof(xdlclass_t *)))) {
return -1;
}
cf->rcrecs = rcrecs;
}
cf->rcrecs[rcrec->idx] = rcrec;
rcrec->line = line;
rcrec->size = rec->size;
rcrec->ha = rec->ha;
rcrec->len1 = rcrec->len2 = 0;
rcrec->next = cf->rchash[hi];
cf->rchash[hi] = rcrec;
}
(pass == 1) ? rcrec->len1++ : rcrec->len2++;
rec->ha = (unsigned long) rcrec->idx;
hi = (long) XDL_HASHLONG(rec->ha, hbits);
rec->next = rhash[hi];
rhash[hi] = rec;
return 0;
}
static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_t const *xpp,
xdlclassifier_t *cf, xdfile_t *xdf) {
unsigned int hbits;
long nrec, hsize, bsize;
unsigned long hav;
char const *blk, *cur, *top, *prev;
xrecord_t *crec;
xrecord_t **recs, **rrecs;
xrecord_t **rhash;
unsigned long *ha;
char *rchg;
long *rindex;
ha = NULL;
rindex = NULL;
rchg = NULL;
rhash = NULL;
recs = NULL;
if (xdl_cha_init(&xdf->rcha, sizeof(xrecord_t), narec / 4 + 1) < 0)
goto abort;
if (!(recs = (xrecord_t **) xdl_malloc(narec * sizeof(xrecord_t *))))
goto abort;
if (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF)
hbits = hsize = 0;
else {
hbits = xdl_hashbits((unsigned int) narec);
hsize = 1 << hbits;
if (!(rhash = (xrecord_t **) xdl_malloc(hsize * sizeof(xrecord_t *))))
goto abort;
memset(rhash, 0, hsize * sizeof(xrecord_t *));
}
nrec = 0;
if ((cur = blk = xdl_mmfile_first(mf, &bsize)) != NULL) {
for (top = blk + bsize; cur < top; ) {
prev = cur;
hav = xdl_hash_record(&cur, top, xpp->flags);
if (nrec >= narec) {
narec *= 2;
if (!(rrecs = (xrecord_t **) xdl_realloc(recs, narec * sizeof(xrecord_t *))))
goto abort;
recs = rrecs;
}
if (!(crec = xdl_cha_alloc(&xdf->rcha)))
goto abort;
crec->ptr = prev;
crec->size = (long) (cur - prev);
crec->ha = hav;
recs[nrec++] = crec;
if ((XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF) &&
xdl_classify_record(pass, cf, rhash, hbits, crec) < 0)
goto abort;
}
}
if (!(rchg = (char *) xdl_malloc((nrec + 2) * sizeof(char))))
goto abort;
memset(rchg, 0, (nrec + 2) * sizeof(char));
if (!(rindex = (long *) xdl_malloc((nrec + 1) * sizeof(long))))
goto abort;
if (!(ha = (unsigned long *) xdl_malloc((nrec + 1) * sizeof(unsigned long))))
goto abort;
xdf->nrec = nrec;
xdf->recs = recs;
xdf->hbits = hbits;
xdf->rhash = rhash;
xdf->rchg = rchg + 1;
xdf->rindex = rindex;
xdf->nreff = 0;
xdf->ha = ha;
xdf->dstart = 0;
xdf->dend = nrec - 1;
return 0;
abort:
xdl_free(ha);
xdl_free(rindex);
xdl_free(rchg);
xdl_free(rhash);
xdl_free(recs);
xdl_cha_free(&xdf->rcha);
return -1;
}
static void xdl_free_ctx(xdfile_t *xdf) {
xdl_free(xdf->rhash);
xdl_free(xdf->rindex);
xdl_free(xdf->rchg - 1);
xdl_free(xdf->ha);
xdl_free(xdf->recs);
xdl_cha_free(&xdf->rcha);
}
int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdfenv_t *xe) {
long enl1, enl2, sample;
xdlclassifier_t cf;
memset(&cf, 0, sizeof(cf));
/*
* For histogram diff, we can afford a smaller sample size and
* thus a poorer estimate of the number of lines, as the hash
* table (rhash) won't be filled up/grown. The number of lines
* (nrecs) will be updated correctly anyway by
* xdl_prepare_ctx().
*/
sample = (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF
? XDL_GUESS_NLINES2 : XDL_GUESS_NLINES1);
enl1 = xdl_guess_lines(mf1, sample) + 1;
enl2 = xdl_guess_lines(mf2, sample) + 1;
if (XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF &&
xdl_init_classifier(&cf, enl1 + enl2 + 1, xpp->flags) < 0)
return -1;
if (xdl_prepare_ctx(1, mf1, enl1, xpp, &cf, &xe->xdf1) < 0) {
xdl_free_classifier(&cf);
return -1;
}
if (xdl_prepare_ctx(2, mf2, enl2, xpp, &cf, &xe->xdf2) < 0) {
xdl_free_ctx(&xe->xdf1);
xdl_free_classifier(&cf);
return -1;
}
if ((XDF_DIFF_ALG(xpp->flags) != XDF_PATIENCE_DIFF) &&
(XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF) &&
xdl_optimize_ctxs(&cf, &xe->xdf1, &xe->xdf2) < 0) {
xdl_free_ctx(&xe->xdf2);
xdl_free_ctx(&xe->xdf1);
xdl_free_classifier(&cf);
return -1;
}
if (XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF)
xdl_free_classifier(&cf);
return 0;
}
void xdl_free_env(xdfenv_t *xe) {
xdl_free_ctx(&xe->xdf2);
xdl_free_ctx(&xe->xdf1);
}
static int xdl_clean_mmatch(char const *dis, long i, long s, long e) {
long r, rdis0, rpdis0, rdis1, rpdis1;
/*
* Limits the window the is examined during the similar-lines
* scan. The loops below stops when dis[i - r] == 1 (line that
* has no match), but there are corner cases where the loop
* proceed all the way to the extremities by causing huge
* performance penalties in case of big files.
*/
if (i - s > XDL_SIMSCAN_WINDOW)
s = i - XDL_SIMSCAN_WINDOW;
if (e - i > XDL_SIMSCAN_WINDOW)
e = i + XDL_SIMSCAN_WINDOW;
/*
* Scans the lines before 'i' to find a run of lines that either
* have no match (dis[j] == 0) or have multiple matches (dis[j] > 1).
* Note that we always call this function with dis[i] > 1, so the
* current line (i) is already a multimatch line.
*/
for (r = 1, rdis0 = 0, rpdis0 = 1; (i - r) >= s; r++) {
if (!dis[i - r])
rdis0++;
else if (dis[i - r] == 2)
rpdis0++;
else
break;
}
/*
* If the run before the line 'i' found only multimatch lines, we
* return 0 and hence we don't make the current line (i) discarded.
* We want to discard multimatch lines only when they appear in the
* middle of runs with nomatch lines (dis[j] == 0).
*/
if (rdis0 == 0)
return 0;
for (r = 1, rdis1 = 0, rpdis1 = 1; (i + r) <= e; r++) {
if (!dis[i + r])
rdis1++;
else if (dis[i + r] == 2)
rpdis1++;
else
break;
}
/*
* If the run after the line 'i' found only multimatch lines, we
* return 0 and hence we don't make the current line (i) discarded.
*/
if (rdis1 == 0)
return 0;
rdis1 += rdis0;
rpdis1 += rpdis0;
return rpdis1 * XDL_KPDIS_RUN < (rpdis1 + rdis1);
}
/*
* Try to reduce the problem complexity, discard records that have no
* matches on the other file. Also, lines that have multiple matches
* might be potentially discarded if they happear in a run of discardable.
*/
static int xdl_cleanup_records(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xdf2) {
long i, nm, nreff, mlim;
xrecord_t **recs;
xdlclass_t *rcrec;
char *dis, *dis1, *dis2;
if (!(dis = (char *) xdl_malloc(xdf1->nrec + xdf2->nrec + 2))) {
return -1;
}
memset(dis, 0, xdf1->nrec + xdf2->nrec + 2);
dis1 = dis;
dis2 = dis1 + xdf1->nrec + 1;
if ((mlim = xdl_bogosqrt(xdf1->nrec)) > XDL_MAX_EQLIMIT)
mlim = XDL_MAX_EQLIMIT;
for (i = xdf1->dstart, recs = &xdf1->recs[xdf1->dstart]; i <= xdf1->dend; i++, recs++) {
rcrec = cf->rcrecs[(*recs)->ha];
nm = rcrec ? rcrec->len2 : 0;
dis1[i] = (nm == 0) ? 0: (nm >= mlim) ? 2: 1;
}
if ((mlim = xdl_bogosqrt(xdf2->nrec)) > XDL_MAX_EQLIMIT)
mlim = XDL_MAX_EQLIMIT;
for (i = xdf2->dstart, recs = &xdf2->recs[xdf2->dstart]; i <= xdf2->dend; i++, recs++) {
rcrec = cf->rcrecs[(*recs)->ha];
nm = rcrec ? rcrec->len1 : 0;
dis2[i] = (nm == 0) ? 0: (nm >= mlim) ? 2: 1;
}
for (nreff = 0, i = xdf1->dstart, recs = &xdf1->recs[xdf1->dstart];
i <= xdf1->dend; i++, recs++) {
if (dis1[i] == 1 ||
(dis1[i] == 2 && !xdl_clean_mmatch(dis1, i, xdf1->dstart, xdf1->dend))) {
xdf1->rindex[nreff] = i;
xdf1->ha[nreff] = (*recs)->ha;
nreff++;
} else
xdf1->rchg[i] = 1;
}
xdf1->nreff = nreff;
for (nreff = 0, i = xdf2->dstart, recs = &xdf2->recs[xdf2->dstart];
i <= xdf2->dend; i++, recs++) {
if (dis2[i] == 1 ||
(dis2[i] == 2 && !xdl_clean_mmatch(dis2, i, xdf2->dstart, xdf2->dend))) {
xdf2->rindex[nreff] = i;
xdf2->ha[nreff] = (*recs)->ha;
nreff++;
} else
xdf2->rchg[i] = 1;
}
xdf2->nreff = nreff;
xdl_free(dis);
return 0;
}
/*
* Early trim initial and terminal matching records.
*/
static int xdl_trim_ends(xdfile_t *xdf1, xdfile_t *xdf2) {
long i, lim;
xrecord_t **recs1, **recs2;
recs1 = xdf1->recs;
recs2 = xdf2->recs;
for (i = 0, lim = XDL_MIN(xdf1->nrec, xdf2->nrec); i < lim;
i++, recs1++, recs2++)
if ((*recs1)->ha != (*recs2)->ha)
break;
xdf1->dstart = xdf2->dstart = i;
recs1 = xdf1->recs + xdf1->nrec - 1;
recs2 = xdf2->recs + xdf2->nrec - 1;
for (lim -= i, i = 0; i < lim; i++, recs1--, recs2--)
if ((*recs1)->ha != (*recs2)->ha)
break;
xdf1->dend = xdf1->nrec - i - 1;
xdf2->dend = xdf2->nrec - i - 1;
return 0;
}
static int xdl_optimize_ctxs(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xdf2) {
if (xdl_trim_ends(xdf1, xdf2) < 0 ||
xdl_cleanup_records(cf, xdf1, xdf2) < 0) {
return -1;
}
return 0;
}

34
src/xdiff/xprepare.h Normal file
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@@ -0,0 +1,34 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#if !defined(XPREPARE_H)
#define XPREPARE_H
int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdfenv_t *xe);
void xdl_free_env(xdfenv_t *xe);
#endif /* #if !defined(XPREPARE_H) */

67
src/xdiff/xtypes.h Normal file
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@@ -0,0 +1,67 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#if !defined(XTYPES_H)
#define XTYPES_H
typedef struct s_chanode {
struct s_chanode *next;
long icurr;
} chanode_t;
typedef struct s_chastore {
chanode_t *head, *tail;
long isize, nsize;
chanode_t *ancur;
chanode_t *sncur;
long scurr;
} chastore_t;
typedef struct s_xrecord {
struct s_xrecord *next;
char const *ptr;
long size;
unsigned long ha;
} xrecord_t;
typedef struct s_xdfile {
chastore_t rcha;
long nrec;
unsigned int hbits;
xrecord_t **rhash;
long dstart, dend;
xrecord_t **recs;
char *rchg;
long *rindex;
long nreff;
unsigned long *ha;
} xdfile_t;
typedef struct s_xdfenv {
xdfile_t xdf1, xdf2;
} xdfenv_t;
#endif /* #if !defined(XTYPES_H) */

425
src/xdiff/xutils.c Normal file
View File

@@ -0,0 +1,425 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#include <limits.h>
#include <assert.h>
#include "xinclude.h"
long xdl_bogosqrt(long n) {
long i;
/*
* Classical integer square root approximation using shifts.
*/
for (i = 1; n > 0; n >>= 2)
i <<= 1;
return i;
}
int xdl_emit_diffrec(char const *rec, long size, char const *pre, long psize,
xdemitcb_t *ecb) {
int i = 2;
mmbuffer_t mb[3];
mb[0].ptr = (char *) pre;
mb[0].size = psize;
mb[1].ptr = (char *) rec;
mb[1].size = size;
if (size > 0 && rec[size - 1] != '\n') {
mb[2].ptr = (char *) "\n\\ No newline at end of file\n";
mb[2].size = strlen(mb[2].ptr);
i++;
}
if (ecb->outf(ecb->priv, mb, i) < 0) {
return -1;
}
return 0;
}
void *xdl_mmfile_first(mmfile_t *mmf, long *size)
{
*size = mmf->size;
return mmf->ptr;
}
long xdl_mmfile_size(mmfile_t *mmf)
{
return mmf->size;
}
int xdl_cha_init(chastore_t *cha, long isize, long icount) {
cha->head = cha->tail = NULL;
cha->isize = isize;
cha->nsize = icount * isize;
cha->ancur = cha->sncur = NULL;
cha->scurr = 0;
return 0;
}
void xdl_cha_free(chastore_t *cha) {
chanode_t *cur, *tmp;
for (cur = cha->head; (tmp = cur) != NULL;) {
cur = cur->next;
xdl_free(tmp);
}
}
void *xdl_cha_alloc(chastore_t *cha) {
chanode_t *ancur;
void *data;
if (!(ancur = cha->ancur) || ancur->icurr == cha->nsize) {
if (!(ancur = (chanode_t *) xdl_malloc(sizeof(chanode_t) + cha->nsize))) {
return NULL;
}
ancur->icurr = 0;
ancur->next = NULL;
if (cha->tail)
cha->tail->next = ancur;
if (!cha->head)
cha->head = ancur;
cha->tail = ancur;
cha->ancur = ancur;
}
data = (char *) ancur + sizeof(chanode_t) + ancur->icurr;
ancur->icurr += cha->isize;
return data;
}
long xdl_guess_lines(mmfile_t *mf, long sample) {
long nl = 0, size, tsize = 0;
char const *data, *cur, *top;
if ((cur = data = xdl_mmfile_first(mf, &size)) != NULL) {
for (top = data + size; nl < sample && cur < top; ) {
nl++;
if (!(cur = memchr(cur, '\n', top - cur)))
cur = top;
else
cur++;
}
tsize += (long) (cur - data);
}
if (nl && tsize)
nl = xdl_mmfile_size(mf) / (tsize / nl);
return nl + 1;
}
int xdl_blankline(const char *line, long size, long flags)
{
long i;
if (!(flags & XDF_WHITESPACE_FLAGS))
return (size <= 1);
for (i = 0; i < size && XDL_ISSPACE(line[i]); i++)
;
return (i == size);
}
/*
* Have we eaten everything on the line, except for an optional
* CR at the very end?
*/
static int ends_with_optional_cr(const char *l, long s, long i)
{
int complete = s && l[s-1] == '\n';
if (complete)
s--;
if (s == i)
return 1;
/* do not ignore CR at the end of an incomplete line */
if (complete && s == i + 1 && l[i] == '\r')
return 1;
return 0;
}
int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags)
{
int i1, i2;
if (s1 == s2 && !memcmp(l1, l2, s1))
return 1;
if (!(flags & XDF_WHITESPACE_FLAGS))
return 0;
i1 = 0;
i2 = 0;
/*
* -w matches everything that matches with -b, and -b in turn
* matches everything that matches with --ignore-space-at-eol,
* which in turn matches everything that matches with --ignore-cr-at-eol.
*
* Each flavor of ignoring needs different logic to skip whitespaces
* while we have both sides to compare.
*/
if (flags & XDF_IGNORE_WHITESPACE) {
goto skip_ws;
while (i1 < s1 && i2 < s2) {
if (l1[i1++] != l2[i2++])
return 0;
skip_ws:
while (i1 < s1 && XDL_ISSPACE(l1[i1]))
i1++;
while (i2 < s2 && XDL_ISSPACE(l2[i2]))
i2++;
}
} else if (flags & XDF_IGNORE_WHITESPACE_CHANGE) {
while (i1 < s1 && i2 < s2) {
if (XDL_ISSPACE(l1[i1]) && XDL_ISSPACE(l2[i2])) {
/* Skip matching spaces and try again */
while (i1 < s1 && XDL_ISSPACE(l1[i1]))
i1++;
while (i2 < s2 && XDL_ISSPACE(l2[i2]))
i2++;
continue;
}
if (l1[i1++] != l2[i2++])
return 0;
}
} else if (flags & XDF_IGNORE_WHITESPACE_AT_EOL) {
while (i1 < s1 && i2 < s2 && l1[i1] == l2[i2]) {
i1++;
i2++;
}
} else if (flags & XDF_IGNORE_CR_AT_EOL) {
/* Find the first difference and see how the line ends */
while (i1 < s1 && i2 < s2 && l1[i1] == l2[i2]) {
i1++;
i2++;
}
return (ends_with_optional_cr(l1, s1, i1) &&
ends_with_optional_cr(l2, s2, i2));
}
/*
* After running out of one side, the remaining side must have
* nothing but whitespace for the lines to match. Note that
* ignore-whitespace-at-eol case may break out of the loop
* while there still are characters remaining on both lines.
*/
if (i1 < s1) {
while (i1 < s1 && XDL_ISSPACE(l1[i1]))
i1++;
if (s1 != i1)
return 0;
}
if (i2 < s2) {
while (i2 < s2 && XDL_ISSPACE(l2[i2]))
i2++;
return (s2 == i2);
}
return 1;
}
static unsigned long xdl_hash_record_with_whitespace(char const **data,
char const *top, long flags) {
unsigned long ha = 5381;
char const *ptr = *data;
int cr_at_eol_only = (flags & XDF_WHITESPACE_FLAGS) == XDF_IGNORE_CR_AT_EOL;
for (; ptr < top && *ptr != '\n'; ptr++) {
if (cr_at_eol_only) {
/* do not ignore CR at the end of an incomplete line */
if (*ptr == '\r' &&
(ptr + 1 < top && ptr[1] == '\n'))
continue;
}
else if (XDL_ISSPACE(*ptr)) {
const char *ptr2 = ptr;
int at_eol;
while (ptr + 1 < top && XDL_ISSPACE(ptr[1])
&& ptr[1] != '\n')
ptr++;
at_eol = (top <= ptr + 1 || ptr[1] == '\n');
if (flags & XDF_IGNORE_WHITESPACE)
; /* already handled */
else if (flags & XDF_IGNORE_WHITESPACE_CHANGE
&& !at_eol) {
ha += (ha << 5);
ha ^= (unsigned long) ' ';
}
else if (flags & XDF_IGNORE_WHITESPACE_AT_EOL
&& !at_eol) {
while (ptr2 != ptr + 1) {
ha += (ha << 5);
ha ^= (unsigned long) *ptr2;
ptr2++;
}
}
continue;
}
ha += (ha << 5);
ha ^= (unsigned long) *ptr;
}
*data = ptr < top ? ptr + 1: ptr;
return ha;
}
unsigned long xdl_hash_record(char const **data, char const *top, long flags) {
unsigned long ha = 5381;
char const *ptr = *data;
if (flags & XDF_WHITESPACE_FLAGS)
return xdl_hash_record_with_whitespace(data, top, flags);
for (; ptr < top && *ptr != '\n'; ptr++) {
ha += (ha << 5);
ha ^= (unsigned long) *ptr;
}
*data = ptr < top ? ptr + 1: ptr;
return ha;
}
unsigned int xdl_hashbits(unsigned int size) {
unsigned int val = 1, bits = 0;
for (; val < size && bits < CHAR_BIT * sizeof(unsigned int); val <<= 1, bits++);
return bits ? bits: 1;
}
int xdl_num_out(char *out, long val) {
char *ptr, *str = out;
char buf[32];
ptr = buf + sizeof(buf) - 1;
*ptr = '\0';
if (val < 0) {
*--ptr = '-';
val = -val;
}
for (; val && ptr > buf; val /= 10)
*--ptr = "0123456789"[val % 10];
if (*ptr)
for (; *ptr; ptr++, str++)
*str = *ptr;
else
*str++ = '0';
*str = '\0';
return str - out;
}
int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
const char *func, long funclen, xdemitcb_t *ecb) {
int nb = 0;
mmbuffer_t mb;
char buf[128];
memcpy(buf, "@@ -", 4);
nb += 4;
nb += xdl_num_out(buf + nb, c1 ? s1: s1 - 1);
if (c1 != 1) {
memcpy(buf + nb, ",", 1);
nb += 1;
nb += xdl_num_out(buf + nb, c1);
}
memcpy(buf + nb, " +", 2);
nb += 2;
nb += xdl_num_out(buf + nb, c2 ? s2: s2 - 1);
if (c2 != 1) {
memcpy(buf + nb, ",", 1);
nb += 1;
nb += xdl_num_out(buf + nb, c2);
}
memcpy(buf + nb, " @@", 3);
nb += 3;
if (func && funclen) {
buf[nb++] = ' ';
if (funclen > (long)sizeof(buf) - nb - 1)
funclen = sizeof(buf) - nb - 1;
memcpy(buf + nb, func, funclen);
nb += funclen;
}
buf[nb++] = '\n';
mb.ptr = buf;
mb.size = nb;
if (ecb->outf(ecb->priv, &mb, 1) < 0)
return -1;
return 0;
}
int xdl_fall_back_diff(xdfenv_t *diff_env, xpparam_t const *xpp,
int line1, int count1, int line2, int count2)
{
/*
* This probably does not work outside Git, since
* we have a very simple mmfile structure.
*
* Note: ideally, we would reuse the prepared environment, but
* the libxdiff interface does not (yet) allow for diffing only
* ranges of lines instead of the whole files.
*/
mmfile_t subfile1, subfile2;
xdfenv_t env;
subfile1.ptr = (char *)diff_env->xdf1.recs[line1 - 1]->ptr;
subfile1.size = diff_env->xdf1.recs[line1 + count1 - 2]->ptr +
diff_env->xdf1.recs[line1 + count1 - 2]->size - subfile1.ptr;
subfile2.ptr = (char *)diff_env->xdf2.recs[line2 - 1]->ptr;
subfile2.size = diff_env->xdf2.recs[line2 + count2 - 2]->ptr +
diff_env->xdf2.recs[line2 + count2 - 2]->size - subfile2.ptr;
if (xdl_do_diff(&subfile1, &subfile2, xpp, &env) < 0)
return -1;
memcpy(diff_env->xdf1.rchg + line1 - 1, env.xdf1.rchg, count1);
memcpy(diff_env->xdf2.rchg + line2 - 1, env.xdf2.rchg, count2);
xdl_free_env(&env);
return 0;
}

47
src/xdiff/xutils.h Normal file
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@@ -0,0 +1,47 @@
/*
* LibXDiff by Davide Libenzi ( File Differential Library )
* Copyright (C) 2003 Davide Libenzi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Davide Libenzi <davidel@xmailserver.org>
*
*/
#if !defined(XUTILS_H)
#define XUTILS_H
long xdl_bogosqrt(long n);
int xdl_emit_diffrec(char const *rec, long size, char const *pre, long psize,
xdemitcb_t *ecb);
int xdl_cha_init(chastore_t *cha, long isize, long icount);
void xdl_cha_free(chastore_t *cha);
void *xdl_cha_alloc(chastore_t *cha);
long xdl_guess_lines(mmfile_t *mf, long sample);
int xdl_blankline(const char *line, long size, long flags);
int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags);
unsigned long xdl_hash_record(char const **data, char const *top, long flags);
unsigned int xdl_hashbits(unsigned int size);
int xdl_num_out(char *out, long val);
int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
const char *func, long funclen, xdemitcb_t *ecb);
int xdl_fall_back_diff(xdfenv_t *diff_env, xpparam_t const *xpp,
int line1, int count1, int line2, int count2);
#endif /* #if !defined(XUTILS_H) */