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cuberite-2a/squirrel_3_0_1_stable/squirrel/sqlexer.cpp
cedeel@gmail.com 92c59963f8 Attempt to bring sanity to newlines across systems. 
git-svn-id: http://mc-server.googlecode.com/svn/trunk@606 0a769ca7-a7f5-676a-18bf-c427514a06d6
2012-06-14 13:06:06 +00:00

490 lines
12 KiB
C++
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/*
see copyright notice in squirrel.h
*/
#include "sqpcheader.h"
#include <ctype.h>
#include <stdlib.h>
#include "sqtable.h"
#include "sqstring.h"
#include "sqcompiler.h"
#include "sqlexer.h"
#define CUR_CHAR (_currdata)
#define RETURN_TOKEN(t) { _prevtoken = _curtoken; _curtoken = t; return t;}
#define IS_EOB() (CUR_CHAR <= SQUIRREL_EOB)
#define NEXT() {Next();_currentcolumn++;}
#define INIT_TEMP_STRING() { _longstr.resize(0);}
#define APPEND_CHAR(c) { _longstr.push_back(c);}
#define TERMINATE_BUFFER() {_longstr.push_back(_SC('\0'));}
#define ADD_KEYWORD(key,id) _keywords->NewSlot( SQString::Create(ss, _SC(#key)) ,SQInteger(id))
SQLexer::SQLexer(){}
SQLexer::~SQLexer()
{
_keywords->Release();
}
void SQLexer::Init(SQSharedState *ss, SQLEXREADFUNC rg, SQUserPointer up,CompilerErrorFunc efunc,void *ed)
{
_errfunc = efunc;
_errtarget = ed;
_sharedstate = ss;
_keywords = SQTable::Create(ss, 26);
ADD_KEYWORD(while, TK_WHILE);
ADD_KEYWORD(do, TK_DO);
ADD_KEYWORD(if, TK_IF);
ADD_KEYWORD(else, TK_ELSE);
ADD_KEYWORD(break, TK_BREAK);
ADD_KEYWORD(continue, TK_CONTINUE);
ADD_KEYWORD(return, TK_RETURN);
ADD_KEYWORD(null, TK_NULL);
ADD_KEYWORD(function, TK_FUNCTION);
ADD_KEYWORD(local, TK_LOCAL);
ADD_KEYWORD(for, TK_FOR);
ADD_KEYWORD(foreach, TK_FOREACH);
ADD_KEYWORD(in, TK_IN);
ADD_KEYWORD(typeof, TK_TYPEOF);
ADD_KEYWORD(base, TK_BASE);
ADD_KEYWORD(delete, TK_DELETE);
ADD_KEYWORD(try, TK_TRY);
ADD_KEYWORD(catch, TK_CATCH);
ADD_KEYWORD(throw, TK_THROW);
ADD_KEYWORD(clone, TK_CLONE);
ADD_KEYWORD(yield, TK_YIELD);
ADD_KEYWORD(resume, TK_RESUME);
ADD_KEYWORD(switch, TK_SWITCH);
ADD_KEYWORD(case, TK_CASE);
ADD_KEYWORD(default, TK_DEFAULT);
ADD_KEYWORD(this, TK_THIS);
ADD_KEYWORD(class,TK_CLASS);
ADD_KEYWORD(extends,TK_EXTENDS);
ADD_KEYWORD(constructor,TK_CONSTRUCTOR);
ADD_KEYWORD(instanceof,TK_INSTANCEOF);
ADD_KEYWORD(true,TK_TRUE);
ADD_KEYWORD(false,TK_FALSE);
ADD_KEYWORD(static,TK_STATIC);
ADD_KEYWORD(enum,TK_ENUM);
ADD_KEYWORD(const,TK_CONST);
_readf = rg;
_up = up;
_lasttokenline = _currentline = 1;
_currentcolumn = 0;
_prevtoken = -1;
_reached_eof = SQFalse;
Next();
}
void SQLexer::Error(const SQChar *err)
{
_errfunc(_errtarget,err);
}
void SQLexer::Next()
{
SQInteger t = _readf(_up);
if(t > MAX_CHAR) Error(_SC("Invalid character"));
if(t != 0) {
_currdata = (LexChar)t;
return;
}
_currdata = SQUIRREL_EOB;
_reached_eof = SQTrue;
}
const SQChar *SQLexer::Tok2Str(SQInteger tok)
{
SQObjectPtr itr, key, val;
SQInteger nitr;
while((nitr = _keywords->Next(false,itr, key, val)) != -1) {
itr = (SQInteger)nitr;
if(((SQInteger)_integer(val)) == tok)
return _stringval(key);
}
return NULL;
}
void SQLexer::LexBlockComment()
{
bool done = false;
while(!done) {
switch(CUR_CHAR) {
case _SC('*'): { NEXT(); if(CUR_CHAR == _SC('/')) { done = true; NEXT(); }}; continue;
case _SC('\n'): _currentline++; NEXT(); continue;
case SQUIRREL_EOB: Error(_SC("missing \"*/\" in comment"));
default: NEXT();
}
}
}
void SQLexer::LexLineComment()
{
do { NEXT(); } while (CUR_CHAR != _SC('\n') && (!IS_EOB()));
}
SQInteger SQLexer::Lex()
{
_lasttokenline = _currentline;
while(CUR_CHAR != SQUIRREL_EOB) {
switch(CUR_CHAR){
case _SC('\t'): case _SC('\r'): case _SC(' '): NEXT(); continue;
case _SC('\n'):
_currentline++;
_prevtoken=_curtoken;
_curtoken=_SC('\n');
NEXT();
_currentcolumn=1;
continue;
case _SC('#'): LexLineComment(); continue;
case _SC('/'):
NEXT();
switch(CUR_CHAR){
case _SC('*'):
NEXT();
LexBlockComment();
continue;
case _SC('/'):
LexLineComment();
continue;
case _SC('='):
NEXT();
RETURN_TOKEN(TK_DIVEQ);
continue;
case _SC('>'):
NEXT();
RETURN_TOKEN(TK_ATTR_CLOSE);
continue;
default:
RETURN_TOKEN('/');
}
case _SC('='):
NEXT();
if (CUR_CHAR != _SC('=')){ RETURN_TOKEN('=') }
else { NEXT(); RETURN_TOKEN(TK_EQ); }
case _SC('<'):
NEXT();
switch(CUR_CHAR) {
case _SC('='):
NEXT();
if(CUR_CHAR == _SC('>')) {
NEXT();
RETURN_TOKEN(TK_3WAYSCMP);
}
RETURN_TOKEN(TK_LE)
break;
case _SC('-'): NEXT(); RETURN_TOKEN(TK_NEWSLOT); break;
case _SC('<'): NEXT(); RETURN_TOKEN(TK_SHIFTL); break;
case _SC('/'): NEXT(); RETURN_TOKEN(TK_ATTR_OPEN); break;
}
RETURN_TOKEN('<');
case _SC('>'):
NEXT();
if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_GE);}
else if(CUR_CHAR == _SC('>')){
NEXT();
if(CUR_CHAR == _SC('>')){
NEXT();
RETURN_TOKEN(TK_USHIFTR);
}
RETURN_TOKEN(TK_SHIFTR);
}
else { RETURN_TOKEN('>') }
case _SC('!'):
NEXT();
if (CUR_CHAR != _SC('=')){ RETURN_TOKEN('!')}
else { NEXT(); RETURN_TOKEN(TK_NE); }
case _SC('@'): {
SQInteger stype;
NEXT();
if(CUR_CHAR != _SC('"')) {
RETURN_TOKEN('@');
}
if((stype=ReadString('"',true))!=-1) {
RETURN_TOKEN(stype);
}
Error(_SC("error parsing the string"));
}
case _SC('"'):
case _SC('\''): {
SQInteger stype;
if((stype=ReadString(CUR_CHAR,false))!=-1){
RETURN_TOKEN(stype);
}
Error(_SC("error parsing the string"));
}
case _SC('{'): case _SC('}'): case _SC('('): case _SC(')'): case _SC('['): case _SC(']'):
case _SC(';'): case _SC(','): case _SC('?'): case _SC('^'): case _SC('~'):
{SQInteger ret = CUR_CHAR;
NEXT(); RETURN_TOKEN(ret); }
case _SC('.'):
NEXT();
if (CUR_CHAR != _SC('.')){ RETURN_TOKEN('.') }
NEXT();
if (CUR_CHAR != _SC('.')){ Error(_SC("invalid token '..'")); }
NEXT();
RETURN_TOKEN(TK_VARPARAMS);
case _SC('&'):
NEXT();
if (CUR_CHAR != _SC('&')){ RETURN_TOKEN('&') }
else { NEXT(); RETURN_TOKEN(TK_AND); }
case _SC('|'):
NEXT();
if (CUR_CHAR != _SC('|')){ RETURN_TOKEN('|') }
else { NEXT(); RETURN_TOKEN(TK_OR); }
case _SC(':'):
NEXT();
if (CUR_CHAR != _SC(':')){ RETURN_TOKEN(':') }
else { NEXT(); RETURN_TOKEN(TK_DOUBLE_COLON); }
case _SC('*'):
NEXT();
if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_MULEQ);}
else RETURN_TOKEN('*');
case _SC('%'):
NEXT();
if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_MODEQ);}
else RETURN_TOKEN('%');
case _SC('-'):
NEXT();
if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_MINUSEQ);}
else if (CUR_CHAR == _SC('-')){ NEXT(); RETURN_TOKEN(TK_MINUSMINUS);}
else RETURN_TOKEN('-');
case _SC('+'):
NEXT();
if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_PLUSEQ);}
else if (CUR_CHAR == _SC('+')){ NEXT(); RETURN_TOKEN(TK_PLUSPLUS);}
else RETURN_TOKEN('+');
case SQUIRREL_EOB:
return 0;
default:{
if (scisdigit(CUR_CHAR)) {
SQInteger ret = ReadNumber();
RETURN_TOKEN(ret);
}
else if (scisalpha(CUR_CHAR) || CUR_CHAR == _SC('_')) {
SQInteger t = ReadID();
RETURN_TOKEN(t);
}
else {
SQInteger c = CUR_CHAR;
if (sciscntrl((int)c)) Error(_SC("unexpected character(control)"));
NEXT();
RETURN_TOKEN(c);
}
RETURN_TOKEN(0);
}
}
}
return 0;
}
SQInteger SQLexer::GetIDType(SQChar *s)
{
SQObjectPtr t;
if(_keywords->Get(SQString::Create(_sharedstate, s), t)) {
return SQInteger(_integer(t));
}
return TK_IDENTIFIER;
}
SQInteger SQLexer::ReadString(SQInteger ndelim,bool verbatim)
{
INIT_TEMP_STRING();
NEXT();
if(IS_EOB()) return -1;
for(;;) {
while(CUR_CHAR != ndelim) {
switch(CUR_CHAR) {
case SQUIRREL_EOB:
Error(_SC("unfinished string"));
return -1;
case _SC('\n'):
if(!verbatim) Error(_SC("newline in a constant"));
APPEND_CHAR(CUR_CHAR); NEXT();
_currentline++;
break;
case _SC('\\'):
if(verbatim) {
APPEND_CHAR('\\'); NEXT();
}
else {
NEXT();
switch(CUR_CHAR) {
case _SC('x'): NEXT(); {
if(!isxdigit(CUR_CHAR)) Error(_SC("hexadecimal number expected"));
const SQInteger maxdigits = 4;
SQChar temp[maxdigits+1];
SQInteger n = 0;
while(isxdigit(CUR_CHAR) && n < maxdigits) {
temp[n] = CUR_CHAR;
n++;
NEXT();
}
temp[n] = 0;
SQChar *sTemp;
APPEND_CHAR((SQChar)scstrtoul(temp,&sTemp,16));
}
break;
case _SC('t'): APPEND_CHAR(_SC('\t')); NEXT(); break;
case _SC('a'): APPEND_CHAR(_SC('\a')); NEXT(); break;
case _SC('b'): APPEND_CHAR(_SC('\b')); NEXT(); break;
case _SC('n'): APPEND_CHAR(_SC('\n')); NEXT(); break;
case _SC('r'): APPEND_CHAR(_SC('\r')); NEXT(); break;
case _SC('v'): APPEND_CHAR(_SC('\v')); NEXT(); break;
case _SC('f'): APPEND_CHAR(_SC('\f')); NEXT(); break;
case _SC('0'): APPEND_CHAR(_SC('\0')); NEXT(); break;
case _SC('\\'): APPEND_CHAR(_SC('\\')); NEXT(); break;
case _SC('"'): APPEND_CHAR(_SC('"')); NEXT(); break;
case _SC('\''): APPEND_CHAR(_SC('\'')); NEXT(); break;
default:
Error(_SC("unrecognised escaper char"));
break;
}
}
break;
default:
APPEND_CHAR(CUR_CHAR);
NEXT();
}
}
NEXT();
if(verbatim && CUR_CHAR == '"') { //double quotation
APPEND_CHAR(CUR_CHAR);
NEXT();
}
else {
break;
}
}
TERMINATE_BUFFER();
SQInteger len = _longstr.size()-1;
if(ndelim == _SC('\'')) {
if(len == 0) Error(_SC("empty constant"));
if(len > 1) Error(_SC("constant too long"));
_nvalue = _longstr[0];
return TK_INTEGER;
}
_svalue = &_longstr[0];
return TK_STRING_LITERAL;
}
void LexHexadecimal(const SQChar *s,SQUnsignedInteger *res)
{
*res = 0;
while(*s != 0)
{
if(scisdigit(*s)) *res = (*res)*16+((*s++)-'0');
else if(scisxdigit(*s)) *res = (*res)*16+(toupper(*s++)-'A'+10);
else { assert(0); }
}
}
void LexInteger(const SQChar *s,SQUnsignedInteger *res)
{
*res = 0;
while(*s != 0)
{
*res = (*res)*10+((*s++)-'0');
}
}
SQInteger scisodigit(SQInteger c) { return c >= _SC('0') && c <= _SC('7'); }
void LexOctal(const SQChar *s,SQUnsignedInteger *res)
{
*res = 0;
while(*s != 0)
{
if(scisodigit(*s)) *res = (*res)*8+((*s++)-'0');
else { assert(0); }
}
}
SQInteger isexponent(SQInteger c) { return c == 'e' || c=='E'; }
#define MAX_HEX_DIGITS (sizeof(SQInteger)*2)
SQInteger SQLexer::ReadNumber()
{
#define TINT 1
#define TFLOAT 2
#define THEX 3
#define TSCIENTIFIC 4
#define TOCTAL 5
SQInteger type = TINT, firstchar = CUR_CHAR;
SQChar *sTemp;
INIT_TEMP_STRING();
NEXT();
if(firstchar == _SC('0') && (toupper(CUR_CHAR) == _SC('X') || scisodigit(CUR_CHAR)) ) {
if(scisodigit(CUR_CHAR)) {
type = TOCTAL;
while(scisodigit(CUR_CHAR)) {
APPEND_CHAR(CUR_CHAR);
NEXT();
}
if(scisdigit(CUR_CHAR)) Error(_SC("invalid octal number"));
}
else {
NEXT();
type = THEX;
while(isxdigit(CUR_CHAR)) {
APPEND_CHAR(CUR_CHAR);
NEXT();
}
if(_longstr.size() > MAX_HEX_DIGITS) Error(_SC("too many digits for an Hex number"));
}
}
else {
APPEND_CHAR((int)firstchar);
while (CUR_CHAR == _SC('.') || scisdigit(CUR_CHAR) || isexponent(CUR_CHAR)) {
if(CUR_CHAR == _SC('.')) type = TFLOAT;
if(isexponent(CUR_CHAR)) {
if(type != TFLOAT) Error(_SC("invalid numeric format"));
type = TSCIENTIFIC;
APPEND_CHAR(CUR_CHAR);
NEXT();
if(CUR_CHAR == '+' || CUR_CHAR == '-'){
APPEND_CHAR(CUR_CHAR);
NEXT();
}
if(!scisdigit(CUR_CHAR)) Error(_SC("exponent expected"));
}
APPEND_CHAR(CUR_CHAR);
NEXT();
}
}
TERMINATE_BUFFER();
switch(type) {
case TSCIENTIFIC:
case TFLOAT:
_fvalue = (SQFloat)scstrtod(&_longstr[0],&sTemp);
return TK_FLOAT;
case TINT:
LexInteger(&_longstr[0],(SQUnsignedInteger *)&_nvalue);
return TK_INTEGER;
case THEX:
LexHexadecimal(&_longstr[0],(SQUnsignedInteger *)&_nvalue);
return TK_INTEGER;
case TOCTAL:
LexOctal(&_longstr[0],(SQUnsignedInteger *)&_nvalue);
return TK_INTEGER;
}
return 0;
}
SQInteger SQLexer::ReadID()
{
SQInteger res;
INIT_TEMP_STRING();
do {
APPEND_CHAR(CUR_CHAR);
NEXT();
} while(scisalnum(CUR_CHAR) || CUR_CHAR == _SC('_'));
TERMINATE_BUFFER();
res = GetIDType(&_longstr[0]);
if(res == TK_IDENTIFIER || res == TK_CONSTRUCTOR) {
_svalue = &_longstr[0];
}
return res;
}
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