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awk/testdir/funstack.awk
Arnold D. Robbins d6c466c367 Extract testdir.
2019-06-23 03:13:57 -06:00

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Awk
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### ====================================================================
### @Awk-file{
### author = "Nelson H. F. Beebe",
### version = "1.00",
### date = "09 October 1996",
### time = "15:57:06 MDT",
### filename = "journal-toc.awk",
### address = "Center for Scientific Computing
### Department of Mathematics
### University of Utah
### Salt Lake City, UT 84112
### USA",
### telephone = "+1 801 581 5254",
### FAX = "+1 801 581 4148",
### URL = "http://www.math.utah.edu/~beebe",
### checksum = "25092 977 3357 26493",
### email = "beebe@math.utah.edu (Internet)",
### codetable = "ISO/ASCII",
### keywords = "BibTeX, bibliography, HTML, journal table of
### contents",
### supported = "yes",
### docstring = "Create a journal cover table of contents from
### <at>Article{...} entries in a journal BibTeX
### .bib file for checking the bibliography
### database against the actual journal covers.
### The output can be either plain text, or HTML.
###
### Usage:
### bibclean -max-width 0 BibTeX-file(s) | \
### bibsort -byvolume | \
### awk -f journal-toc.awk \
### [-v HTML=nnn] [-v INDENT=nnn] \
### [-v BIBFILEURL=url] >foo.toc
###
### or if the bibliography is already sorted
### by volume,
###
### bibclean -max-width 0 BibTeX-file(s) | \
### awk -f journal-toc.awk \
### [-v HTML=nnn] [-v INDENT=nnn] \
### [-v BIBFILEURL=url] >foo.toc
###
### A non-zero value of the command-line option,
### HTML=nnn, results in HTML output instead of
### the default plain ASCII text (corresponding
### to HTML=0). The
###
### The INDENT=nnn command-line option specifies
### the number of blanks to indent each logical
### level of HTML. The default is INDENT=4.
### INDENT=0 suppresses indentation. The INDENT
### option has no effect when the default HTML=0
### (plain text output) option is in effect.
###
### When HTML output is selected, the
### BIBFILEURL=url command-line option provides a
### way to request hypertext links from table of
### contents page numbers to the complete BibTeX
### entry for the article. These links are
### created by appending a sharp (#) and the
### citation label to the BIBFILEURL value, which
### conforms with the practice of
### bibtex-to-html.awk.
###
### The HTML output form may be useful as a more
### compact representation of journal article
### bibliography data than the original BibTeX
### file provides. Of course, the
### table-of-contents format provides less
### information, and is considerably more
### troublesome for a computer program to parse.
###
### When URL key values are provided, they will
### be used to create hypertext links around
### article titles. This supports journals that
### provide article contents on the World-Wide
### Web.
###
### For parsing simplicity, this program requires
### that BibTeX
###
### key = "value"
###
### and
###
### @String{name = "value"}
###
### specifications be entirely contained on
### single lines, which is readily provided by
### the `bibclean -max-width 0' filter. It also
### requires that bibliography entries begin and
### end at the start of a line, and that
### quotation marks, rather than balanced braces,
### delimit string values. This is a
### conventional format that again can be
### guaranteed by bibclean.
###
### This program requires `new' awk, as described
### in the book
###
### Alfred V. Aho, Brian W. Kernighan, and
### Peter J. Weinberger,
### ``The AWK Programming Language'',
### Addison-Wesley (1988), ISBN
### 0-201-07981-X,
###
### such as provided by programs named (GNU)
### gawk, nawk, and recent AT&T awk.
###
### The checksum field above contains a CRC-16
### checksum as the first value, followed by the
### equivalent of the standard UNIX wc (word
### count) utility output of lines, words, and
### characters. This is produced by Robert
### Solovay's checksum utility.",
### }
### ====================================================================
BEGIN { initialize() }
/^ *@ *[Ss][Tt][Rr][Ii][Nn][Gg] *{/ { do_String(); next }
/^ *@ *[Pp][Rr][Ee][Aa][Mm][Bb][Ll][Ee]/ { next }
/^ *@ *[Aa][Rr][Tt][Ii][Cc][Ll][Ee]/ { do_Article(); next }
/^ *@/ { do_Other(); next }
/^ *author *= *\"/ { do_author(); next }
/^ *journal *= */ { do_journal(); next }
/^ *volume *= *\"/ { do_volume(); next }
/^ *number *= *\"/ { do_number(); next }
/^ *year *= *\"/ { do_year(); next }
/^ *month *= */ { do_month(); next }
/^ *title *= *\"/ { do_title(); next }
/^ *pages *= *\"/ { do_pages(); next }
/^ *URL *= *\"/ { do_URL(); next }
/^ *} *$/ { if (In_Article) do_end_entry(); next }
END { terminate() }
########################################################################
# NB: The programming conventions for variables in this program are: #
# UPPERCASE global constants and user options #
# Initialuppercase global variables #
# lowercase local variables #
# Any deviation is an error! #
########################################################################
function do_Article()
{
In_Article = 1
Citation_label = $0
sub(/^[^\{]*{/,"",Citation_label)
sub(/ *, *$/,"",Citation_label)
Author = ""
Title = ""
Journal = ""
Volume = ""
Number = ""
Month = ""
Year = ""
Pages = ""
Url = ""
}
function do_author()
{
Author = TeX_to_HTML(get_value($0))
}
function do_end_entry( k,n,parts)
{
n = split(Author,parts," and ")
if (Last_number != Number)
do_new_issue()
for (k = 1; k < n; ++k)
print_toc_line(parts[k] " and", "", "")
Title_prefix = html_begin_title()
Title_suffix = html_end_title()
if (html_length(Title) <= (MAX_TITLE_CHARS + MIN_LEADERS)) # complete title fits on line
print_toc_line(parts[n], Title, html_begin_pages() Pages html_end_pages())
else # need to split long title over multiple lines
do_long_title(parts[n], Title, html_begin_pages() Pages html_end_pages())
}
function do_journal()
{
if ($0 ~ /[=] *"/) # have journal = "quoted journal name",
Journal = get_value($0)
else # have journal = journal-abbreviation,
{
Journal = get_abbrev($0)
if (Journal in String) # replace abbrev by its expansion
Journal = String[Journal]
}
gsub(/\\-/,"",Journal) # remove discretionary hyphens
}
function do_long_title(author,title,pages, last_title,n)
{
title = trim(title) # discard leading and trailing space
while (length(title) > 0)
{
n = html_breakpoint(title,MAX_TITLE_CHARS+MIN_LEADERS)
last_title = substr(title,1,n)
title = substr(title,n+1)
sub(/^ +/,"",title) # discard any leading space
print_toc_line(author, last_title, (length(title) == 0) ? pages : "")
author = ""
}
}
function do_month( k,n,parts)
{
Month = ($0 ~ /[=] *"/) ? get_value($0) : get_abbrev($0)
gsub(/[\"]/,"",Month)
gsub(/ *# *\\slash *# */," / ",Month)
gsub(/ *# *-+ *# */," / ",Month)
n = split(Month,parts," */ *")
Month = ""
for (k = 1; k <= n; ++k)
Month = Month ((k > 1) ? " / " : "") \
((parts[k] in Month_expansion) ? Month_expansion[parts[k]] : parts[k])
}
function do_new_issue()
{
Last_number = Number
if (HTML)
{
if (Last_volume != Volume)
{
Last_volume = Volume
print_line(prefix(2) "<BR>")
}
html_end_toc()
html_begin_issue()
print_line(prefix(2) Journal "<BR>")
}
else
{
print_line("")
print_line(Journal)
}
print_line(strip_html(vol_no_month_year()))
if (HTML)
{
html_end_issue()
html_toc_entry()
html_begin_toc()
}
else
print_line("")
}
function do_number()
{
Number = get_value($0)
}
function do_Other()
{
In_Article = 0
}
function do_pages()
{
Pages = get_value($0)
sub(/--[?][?]/,"",Pages)
}
function do_String()
{
sub(/^[^\{]*\{/,"",$0) # discard up to and including open brace
sub(/\} *$/,"",$0) # discard from optional whitespace and trailing brace to end of line
String[get_key($0)] = get_value($0)
}
function do_title()
{
Title = TeX_to_HTML(get_value($0))
}
function do_URL( parts)
{
Url = get_value($0)
split(Url,parts,"[,;]") # in case we have multiple URLs
Url = trim(parts[1])
}
function do_volume()
{
Volume = get_value($0)
}
function do_year()
{
Year = get_value($0)
}
function get_abbrev(s)
{ # return abbrev from ``key = abbrev,''
sub(/^[^=]*= */,"",s) # discard text up to start of non-blank value
sub(/ *,? *$/,"",s) # discard trailing optional whitspace, quote,
# optional comma, and optional space
return (s)
}
function get_key(s)
{ # return kay from ``key = "value",''
sub(/^ */,"",s) # discard leading space
sub(/ *=.*$/,"",s) # discard everthing after key
return (s)
}
function get_value(s)
{ # return value from ``key = "value",''
sub(/^[^\"]*\" */,"",s) # discard text up to start of non-blank value
sub(/ *\",? *$/,"",s) # discard trailing optional whitspace, quote,
# optional comma, and optional space
return (s)
}
function html_accents(s)
{
if (index(s,"\\") > 0) # important optimization
{
# Convert common lower-case accented letters according to the
# table on p. 169 of in Peter Flynn's ``The World Wide Web
# Handbook'', International Thomson Computer Press, 1995, ISBN
# 1-85032-205-8. The official table of ISO Latin 1 SGML
# entities used in HTML can be found in the file
# /usr/local/lib/html-check/lib/ISOlat1.sgml (your path
# may differ).
gsub(/{\\\a}/, "\\&agrave;", s)
gsub(/{\\'a}/, "\\&aacute;", s)
gsub(/{\\[\^]a}/,"\\&acirc;", s)
gsub(/{\\~a}/, "\\&atilde;", s)
gsub(/{\\\"a}/, "\\&auml;", s)
gsub(/{\\aa}/, "\\&aring;", s)
gsub(/{\\ae}/, "\\&aelig;", s)
gsub(/{\\c{c}}/,"\\&ccedil;", s)
gsub(/{\\\e}/, "\\&egrave;", s)
gsub(/{\\'e}/, "\\&eacute;", s)
gsub(/{\\[\^]e}/,"\\&ecirc;", s)
gsub(/{\\\"e}/, "\\&euml;", s)
gsub(/{\\\i}/, "\\&igrave;", s)
gsub(/{\\'i}/, "\\&iacute;", s)
gsub(/{\\[\^]i}/,"\\&icirc;", s)
gsub(/{\\\"i}/, "\\&iuml;", s)
# ignore eth and thorn
gsub(/{\\~n}/, "\\&ntilde;", s)
gsub(/{\\\o}/, "\\&ograve;", s)
gsub(/{\\'o}/, "\\&oacute;", s)
gsub(/{\\[\^]o}/, "\\&ocirc;", s)
gsub(/{\\~o}/, "\\&otilde;", s)
gsub(/{\\\"o}/, "\\&ouml;", s)
gsub(/{\\o}/, "\\&oslash;", s)
gsub(/{\\\u}/, "\\&ugrave;", s)
gsub(/{\\'u}/, "\\&uacute;", s)
gsub(/{\\[\^]u}/,"\\&ucirc;", s)
gsub(/{\\\"u}/, "\\&uuml;", s)
gsub(/{\\'y}/, "\\&yacute;", s)
gsub(/{\\\"y}/, "\\&yuml;", s)
# Now do the same for upper-case accents
gsub(/{\\\A}/, "\\&Agrave;", s)
gsub(/{\\'A}/, "\\&Aacute;", s)
gsub(/{\\[\^]A}/, "\\&Acirc;", s)
gsub(/{\\~A}/, "\\&Atilde;", s)
gsub(/{\\\"A}/, "\\&Auml;", s)
gsub(/{\\AA}/, "\\&Aring;", s)
gsub(/{\\AE}/, "\\&AElig;", s)
gsub(/{\\c{C}}/,"\\&Ccedil;", s)
gsub(/{\\\e}/, "\\&Egrave;", s)
gsub(/{\\'E}/, "\\&Eacute;", s)
gsub(/{\\[\^]E}/, "\\&Ecirc;", s)
gsub(/{\\\"E}/, "\\&Euml;", s)
gsub(/{\\\I}/, "\\&Igrave;", s)
gsub(/{\\'I}/, "\\&Iacute;", s)
gsub(/{\\[\^]I}/, "\\&Icirc;", s)
gsub(/{\\\"I}/, "\\&Iuml;", s)
# ignore eth and thorn
gsub(/{\\~N}/, "\\&Ntilde;", s)
gsub(/{\\\O}/, "\\&Ograve;", s)
gsub(/{\\'O}/, "\\&Oacute;", s)
gsub(/{\\[\^]O}/, "\\&Ocirc;", s)
gsub(/{\\~O}/, "\\&Otilde;", s)
gsub(/{\\\"O}/, "\\&Ouml;", s)
gsub(/{\\O}/, "\\&Oslash;", s)
gsub(/{\\\U}/, "\\&Ugrave;", s)
gsub(/{\\'U}/, "\\&Uacute;", s)
gsub(/{\\[\^]U}/, "\\&Ucirc;", s)
gsub(/{\\\"U}/, "\\&Uuml;", s)
gsub(/{\\'Y}/, "\\&Yacute;", s)
gsub(/{\\ss}/, "\\&szlig;", s)
# Others not mentioned in Flynn's book
gsub(/{\\'\\i}/,"\\&iacute;", s)
gsub(/{\\'\\j}/,"j", s)
}
return (s)
}
function html_begin_issue()
{
print_line("")
print_line(prefix(2) "<HR>")
print_line("")
print_line(prefix(2) "<H1>")
print_line(prefix(3) "<A NAME=\"" html_label() "\">")
}
function html_begin_pages()
{
return ((HTML && (BIBFILEURL != "")) ? ("<A HREF=\"" BIBFILEURL "#" Citation_label "\">") : "")
}
function html_begin_pre()
{
In_PRE = 1
print_line("<PRE>")
}
function html_begin_title()
{
return ((HTML && (Url != "")) ? ("<A HREF=\"" Url "\">") : "")
}
function html_begin_toc()
{
html_end_toc()
html_begin_pre()
}
function html_body( k)
{
for (k = 1; k <= BodyLines; ++k)
print Body[k]
}
function html_breakpoint(title,maxlength, break_after,k)
{
# Return the largest character position in title AFTER which we
# can break the title across lines, without exceeding maxlength
# visible characters.
if (html_length(title) > maxlength) # then need to split title across lines
{
# In the presence of HTML markup, the initialization of
# k here is complicated, because we need to advance it
# until html_length(title) is at least maxlength,
# without invoking the expensive html_length() function
# too frequently. The need to split the title makes the
# alternative of delayed insertion of HTML markup much
# more complicated.
break_after = 0
for (k = min(maxlength,length(title)); k < length(title); ++k)
{
if (substr(title,k+1,1) == " ")
{ # could break after position k
if (html_length(substr(title,1,k)) <= maxlength)
break_after = k
else # advanced too far, retreat back to last break_after
break
}
}
if (break_after == 0) # no breakpoint found by forward scan
{ # so switch to backward scan
for (k = min(maxlength,length(title)) - 1; \
(k > 0) && (substr(title,k+1,1) != " "); --k)
; # find space at which to break title
if (k < 1) # no break point found
k = length(title) # so must print entire string
}
else
k = break_after
}
else # title fits on one line
k = length(title)
return (k)
}
function html_end_issue()
{
print_line(prefix(3) "</A>")
print_line(prefix(2) "</H1>")
}
function html_end_pages()
{
return ((HTML && (BIBFILEURL != "")) ? "</A>" : "")
}
function html_end_pre()
{
if (In_PRE)
{
print_line("</PRE>")
In_PRE = 0
}
}
function html_end_title()
{
return ((HTML && (Url != "")) ? "</A>" : "")
}
function html_end_toc()
{
html_end_pre()
}
function html_fonts(s, arg,control_word,k,level,n,open_brace)
{
open_brace = index(s,"{")
if (open_brace > 0) # important optimization
{
level = 1
for (k = open_brace + 1; (level != 0) && (k <= length(s)); ++k)
{
if (substr(s,k,1) == "{")
level++
else if (substr(s,k,1) == "}")
level--
}
# {...} is now found at open_brace ... (k-1)
for (control_word in Font_decl_map) # look for {\xxx ...}
{
if (substr(s,open_brace+1,length(control_word)+1) ~ \
("\\" control_word "[^A-Za-z]"))
{
n = open_brace + 1 + length(control_word)
arg = trim(substr(s,n,k - n))
if (Font_decl_map[control_word] == "toupper") # arg -> ARG
arg = toupper(arg)
else if (Font_decl_map[control_word] != "") # arg -> <TAG>arg</TAG>
arg = "<" Font_decl_map[control_word] ">" arg "</" Font_decl_map[control_word] ">"
return (substr(s,1,open_brace-1) arg html_fonts(substr(s,k)))
}
}
for (control_word in Font_cmd_map) # look for \xxx{...}
{
if (substr(s,open_brace - length(control_word),length(control_word)) ~ \
("\\" control_word))
{
n = open_brace + 1
arg = trim(substr(s,n,k - n))
if (Font_cmd_map[control_word] == "toupper") # arg -> ARG
arg = toupper(arg)
else if (Font_cmd_map[control_word] != "") # arg -> <TAG>arg</TAG>
arg = "<" Font_cmd_map[control_word] ">" arg "</" Font_cmd_map[control_word] ">"
n = open_brace - length(control_word) - 1
return (substr(s,1,n) arg html_fonts(substr(s,k)))
}
}
}
return (s)
}
function html_header()
{
USER = ENVIRON["USER"]
if (USER == "")
USER = ENVIRON["LOGNAME"]
if (USER == "")
USER = "????"
"hostname" | getline HOSTNAME
"date" | getline DATE
("ypcat passwd | grep '^" USER ":' | awk -F: '{print $5}'") | getline PERSONAL_NAME
if (PERSONAL_NAME == "")
("grep '^" USER ":' /etc/passwd | awk -F: '{print $5}'") | getline PERSONAL_NAME
print "<!-- WARNING: Do NOT edit this file. It was converted from -->"
print "<!-- BibTeX format to HTML by journal-toc.awk version " VERSION_NUMBER " " VERSION_DATE " -->"
print "<!-- on " DATE " -->"
print "<!-- for " PERSONAL_NAME " (" USER "@" HOSTNAME ") -->"
print ""
print ""
print "<!DOCTYPE HTML public \"-//IETF//DTD HTML//EN\">"
print ""
print "<HTML>"
print prefix(1) "<HEAD>"
print prefix(2) "<TITLE>"
print prefix(3) Journal
print prefix(2) "</TITLE>"
print prefix(2) "<LINK REV=\"made\" HREF=\"mailto:" USER "@" HOSTNAME "\">"
print prefix(1) "</HEAD>"
print ""
print prefix(1) "<BODY>"
}
function html_label( label)
{
label = Volume "(" Number "):" Month ":" Year
gsub(/[^A-Za-z0-9():,;.\/\-]/,"",label)
return (label)
}
function html_length(s)
{ # Return visible length of s, ignoring any HTML markup
if (HTML)
{
gsub(/<\/?[^>]*>/,"",s) # remove SGML tags
gsub(/&[A-Za-z0-9]+;/,"",s) # remove SGML entities
}
return (length(s))
}
function html_toc()
{
print prefix(2) "<H1>"
print prefix(3) "Table of contents for issues of " Journal
print prefix(2) "</H1>"
print HTML_TOC
}
function html_toc_entry()
{
HTML_TOC = HTML_TOC " <A HREF=\"#" html_label() "\">"
HTML_TOC = HTML_TOC vol_no_month_year()
HTML_TOC = HTML_TOC "</A><BR>" "\n"
}
function html_trailer()
{
html_end_pre()
print prefix(1) "</BODY>"
print "</HTML>"
}
function initialize()
{
# NB: Update these when the program changes
VERSION_DATE = "[09-Oct-1996]"
VERSION_NUMBER = "1.00"
HTML = (HTML == "") ? 0 : (0 + HTML)
if (INDENT == "")
INDENT = 4
if (HTML == 0)
INDENT = 0 # indentation suppressed in ASCII mode
LEADERS = " . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ."
MAX_TITLE_CHARS = 36 # 36 produces a 79-char output line when there is
# just an initial page number. If this is
# increased, the LEADERS string may need to be
# lengthened.
MIN_LEADERS = 4 # Minimum number of characters from LEADERS
# required when leaders are used. The total
# number of characters that can appear in a
# title line is MAX_TITLE_CHARS + MIN_LEADERS.
# Leaders are omitted when the title length is
# between MAX_TITLE_CHARS and this sum.
MIN_LEADERS_SPACE = " " # must be at least MIN_LEADERS characters long
Month_expansion["jan"] = "January"
Month_expansion["feb"] = "February"
Month_expansion["mar"] = "March"
Month_expansion["apr"] = "April"
Month_expansion["may"] = "May"
Month_expansion["jun"] = "June"
Month_expansion["jul"] = "July"
Month_expansion["aug"] = "August"
Month_expansion["sep"] = "September"
Month_expansion["oct"] = "October"
Month_expansion["nov"] = "November"
Month_expansion["dec"] = "December"
Font_cmd_map["\\emph"] = "EM"
Font_cmd_map["\\textbf"] = "B"
Font_cmd_map["\\textit"] = "I"
Font_cmd_map["\\textmd"] = ""
Font_cmd_map["\\textrm"] = ""
Font_cmd_map["\\textsc"] = "toupper"
Font_cmd_map["\\textsl"] = "I"
Font_cmd_map["\\texttt"] = "t"
Font_cmd_map["\\textup"] = ""
Font_decl_map["\\bf"] = "B"
Font_decl_map["\\em"] = "EM"
Font_decl_map["\\it"] = "I"
Font_decl_map["\\rm"] = ""
Font_decl_map["\\sc"] = "toupper"
Font_decl_map["\\sf"] = ""
Font_decl_map["\\tt"] = "TT"
Font_decl_map["\\itshape"] = "I"
Font_decl_map["\\upshape"] = ""
Font_decl_map["\\slshape"] = "I"
Font_decl_map["\\scshape"] = "toupper"
Font_decl_map["\\mdseries"] = ""
Font_decl_map["\\bfseries"] = "B"
Font_decl_map["\\rmfamily"] = ""
Font_decl_map["\\sffamily"] = ""
Font_decl_map["\\ttfamily"] = "TT"
}
function min(a,b)
{
return (a < b) ? a : b
}
function prefix(level)
{
# Return a prefix of up to 60 blanks
if (In_PRE)
return ("")
else
return (substr(" ", \
1, INDENT * level))
}
function print_line(line)
{
if (HTML) # must buffer in memory so that we can accumulate TOC
Body[++BodyLines] = line
else
print line
}
function print_toc_line(author,title,pages, extra,leaders,n,t)
{
# When we have a multiline title, the hypertext link goes only
# on the first line. A multiline hypertext link looks awful
# because of long underlines under the leading indentation.
if (pages == "") # then no leaders needed in title lines other than last one
t = sprintf("%31s %s%s%s", author, Title_prefix, title, Title_suffix)
else # last title line, with page number
{
n = html_length(title) # potentially expensive
extra = n % 2 # extra space for aligned leader dots
if (n <= MAX_TITLE_CHARS) # then need leaders
leaders = substr(LEADERS, 1, MAX_TITLE_CHARS + MIN_LEADERS - extra - \
min(MAX_TITLE_CHARS,n))
else # title (almost) fills line, so no leaders
leaders = substr(MIN_LEADERS_SPACE,1, \
(MAX_TITLE_CHARS + MIN_LEADERS - extra - n))
t = sprintf("%31s %s%s%s%s%s %4s", \
author, Title_prefix, title, Title_suffix, \
(extra ? " " : ""), leaders, pages)
}
Title_prefix = "" # forget any hypertext
Title_suffix = "" # link material
# Efficency note: an earlier version accumulated the body in a
# single scalar like this: "Body = Body t". Profiling revealed
# this statement as the major hot spot, and the change to array
# storage made the program more than twice as fast. This
# suggests that awk might benefit from an optimization of
# "s = s t" that uses realloc() instead of malloc().
if (HTML)
Body[++BodyLines] = t
else
print t
}
function protect_SGML_characters(s)
{
gsub(/&/,"\\&amp;",s) # NB: this one MUST be first
gsub(/</,"\\&lt;",s)
gsub(/>/,"\\&gt;",s)
gsub(/\"/,"\\&quot;",s)
return (s)
}
function strip_braces(s, k)
{ # strip non-backslashed braces from s and return the result
return (strip_char(strip_char(s,"{"),"}"))
}
function strip_char(s,c, k)
{ # strip non-backslashed instances of c from s, and return the result
k = index(s,c)
if (k > 0) # then found the character
{
if (substr(s,k-1,1) != "\\") # then not backslashed char
s = substr(s,1,k-1) strip_char(substr(s,k+1),c) # so remove it (recursively)
else # preserve backslashed char
s = substr(s,1,k) strip_char(s,k+1,c)
}
return (s)
}
function strip_html(s)
{
gsub(/<\/?[^>]*>/,"",s)
return (s)
}
function terminate()
{
if (HTML)
{
html_end_pre()
HTML = 0 # NB: stop line buffering
html_header()
html_toc()
html_body()
html_trailer()
}
}
function TeX_to_HTML(s, k,n,parts)
{
# First convert the four SGML reserved characters to SGML entities
if (HTML)
{
gsub(/>/, "\\&gt;", s)
gsub(/</, "\\&lt;", s)
gsub(/"/, "\\&quot;", s)
}
gsub(/[$][$]/,"$$",s) # change display math to triple dollars for split
n = split(s,parts,/[$]/)# split into non-math (odd) and math (even) parts
s = ""
for (k = 1; k <= n; ++k) # unbrace non-math part, leaving math mode intact
s = s ((k > 1) ? "$" : "") \
((k % 2) ? strip_braces(TeX_to_HTML_nonmath(parts[k])) : \
TeX_to_HTML_math(parts[k]))
gsub(/[$][$][$]/,"$$",s) # restore display math
return (s)
}
function TeX_to_HTML_math(s)
{
# Mostly a dummy for now, but HTML 3 could support some math translation
gsub(/\\&/,"\\&amp;",s) # reduce TeX ampersands to SGML entities
return (s)
}
function TeX_to_HTML_nonmath(s)
{
if (index(s,"\\") > 0) # important optimization
{
gsub(/\\slash +/,"/",s) # replace TeX slashes with conventional ones
gsub(/ *\\emdash +/," --- ",s) # replace BibNet emdashes with conventional ones
gsub(/\\%/,"%",s) # reduce TeX percents to conventional ones
gsub(/\\[$]/,"$",s) # reduce TeX dollars to conventional ones
gsub(/\\#/,"#",s) # reduce TeX sharps to conventional ones
if (HTML) # translate TeX markup to HTML
{
gsub(/\\&/,"\\&amp;",s) # reduce TeX ampersands to SGML entities
s = html_accents(s)
s = html_fonts(s)
}
else # plain ASCII text output: discard all TeX markup
{
gsub(/\\\&/, "\\&", s) # reduce TeX ampersands to conventional ones
gsub(/\\[a-z][a-z] +/,"",s) # remove TeX font changes
gsub(/\\[^A-Za-z]/,"",s) # remove remaining TeX control symbols
}
}
return (s)
}
function trim(s)
{
gsub(/^[ \t]+/,"",s)
gsub(/[ \t]+$/,"",s)
return (s)
}
function vol_no_month_year()
{
return ("Volume " wrap(Volume) ", Number " wrap(Number) ", " wrap(Month) ", " wrap(Year))
}
function wrap(value)
{
return (HTML ? ("<STRONG>" value "</STRONG>") : value)
}
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