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# lexer.cpp

    00001 // -*- c-basic-offset: 2 -*-
    00002 /*
    00003  *  This file is part of the KDE libraries
    00004  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
    00005  *
    00006  *  This library is free software; you can redistribute it and/or
    00007  *  modify it under the terms of the GNU Library General Public
    00008  *  License as published by the Free Software Foundation; either
    00009  *  version 2 of the License, or (at your option) any later version.
    00010  *
    00011  *  This library is distributed in the hope that it will be useful,
    00012  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    00013  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00014  *  Library General Public License for more details.
    00015  *
    00016  *  You should have received a copy of the GNU Library General Public License
    00017  *  along with this library; see the file COPYING.LIB.  If not, write to
    00018  *  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00019  *  Boston, MA 02111-1307, USA.
    00020  *
    00021  */
    00022
    00023 #ifdef HAVE_CONFIG_H
    00024 #include <config.h>
    00025 #endif
    00026
    00027 #include <ctype.h>
    00028 #include <stdlib.h>
    00029 #include <stdio.h>
    00030 #include <string.h>
    00031 #include <assert.h>
    00032
    00033 #include "value.h"
    00034 #include "object.h"
    00035 #include "types.h"
    00036 #include "interpreter.h"
    00037 #include "nodes.h"
    00038 #include "lexer.h"
    00039 #include "identifier.h"
    00040 #include "lookup.h"
    00041 #include "internal.h"
    00042
    00043 // we can't specify the namespace in yacc's C output, so do it here
    00044 using namespace KJS;
    00045
    00046 static Lexer *currLexer = 0;
    00047
    00048 #ifndef KDE_USE_FINAL
    00049 #include "grammar.h"
    00050 #endif
    00051
    00052 #include "lexer.lut.h"
    00053
    00054 extern YYLTYPE yylloc; // global bison variable holding token info
    00055
    00056 // a bridge for yacc from the C world to C++
    00057 int kjsyylex()
    00058 {
    00059   return Lexer::curr()->lex();
    00060 }
    00061
    00062 Lexer::Lexer()
    00063   : yylineno(1),
    00064     size8(128), size16(128), restrKeyword(false),
    00065     eatNextIdentifier(false), stackToken(-1), lastToken(-1), pos(0),
    00066     code(0), length(0),
    00067 #ifndef KJS_PURE_ECMA
    00068     bol(true),
    00069 #endif
    00070     current(0), next1(0), next2(0), next3(0),
    00071     strings(0), numStrings(0), stringsCapacity(0),
    00072     identifiers(0), numIdentifiers(0), identifiersCapacity(0)
    00073 {
    00074   // allocate space for read buffers
    00075   buffer8 = new char[size8];
    00076   buffer16 = new UChar[size16];
    00077   currLexer = this;
    00078 }
    00079
    00080 Lexer::~Lexer()
    00081 {
    00082   delete [] buffer8;
    00083   delete [] buffer16;
    00084 }
    00085
    00086 Lexer *Lexer::curr()
    00087 {
    00088   if (!currLexer) {
    00089     // create singleton instance
    00090     currLexer = new Lexer();
    00091   }
    00092   return currLexer;
    00093 }
    00094
    00095 #ifdef KJS_DEBUG_MEM
    00096 void Lexer::globalClear()
    00097 {
    00098   delete currLexer;
    00099   currLexer = 0L;
    00100 }
    00101 #endif
    00102
    00103 void Lexer::setCode(const UChar *c, unsigned int len)
    00104 {
    00105   yylineno = 1;
    00106   restrKeyword = false;
    00107   delimited = false;
    00108   eatNextIdentifier = false;
    00109   stackToken = -1;
    00110   lastToken = -1;
    00111   foundBad = false;
    00112   pos = 0;
    00113   code = c;
    00114   length = len;
    00115   skipLF = false;
    00116   skipCR = false;
    00117 #ifndef KJS_PURE_ECMA
    00118   bol = true;
    00119 #endif
    00120
    00121   // read first characters
    00122   current = (length > 0) ? code[0].uc : 0;
    00123   next1 = (length > 1) ? code[1].uc : 0;
    00124   next2 = (length > 2) ? code[2].uc : 0;
    00125   next3 = (length > 3) ? code[3].uc : 0;
    00126 }
    00127
    00128 void Lexer::shift(unsigned int p)
    00129 {
    00130   while (p--) {
    00131     pos++;
    00132     current = next1;
    00133     next1 = next2;
    00134     next2 = next3;
    00135     next3 = (pos + 3 < length) ? code[pos+3].uc : 0;
    00136   }
    00137 }
    00138
    00139 // called on each new line
    00140 void Lexer::nextLine()
    00141 {
    00142   yylineno++;
    00143 #ifndef KJS_PURE_ECMA
    00144   bol = true;
    00145 #endif
    00146 }
    00147
    00148 void Lexer::setDone(State s)
    00149 {
    00150   state = s;
    00151   done = true;
    00152 }
    00153
    00154 int Lexer::lex()
    00155 {
    00156   int token = 0;
    00157   state = Start;
    00158   unsigned short stringType = 0; // either single or double quotes
    00159   pos8 = pos16 = 0;
    00160   done = false;
    00161   terminator = false;
    00162   skipLF = false;
    00163   skipCR = false;
    00164
    00165   // did we push a token on the stack previously ?
    00166   // (after an automatic semicolon insertion)
    00167   if (stackToken >= 0) {
    00168     setDone(Other);
    00169     token = stackToken;
    00170     stackToken = 0;
    00171   }
    00172
    00173   while (!done) {
    00174     if (skipLF && current != '\n') // found \r but not \n afterwards
    00175         skipLF = false;
    00176     if (skipCR && current != '\r') // found \n but not \r afterwards
    00177         skipCR = false;
    00178     if (skipLF || skipCR) // found \r\n or \n\r -> eat the second one
    00179     {
    00180         skipLF = false;
    00181         skipCR = false;
    00182         shift(1);
    00183     }
    00184
    00185     bool cr = (current == '\r');
    00186     bool lf = (current == '\n');
    00187     if (cr)
    00188       skipLF = true;
    00189     else if (lf)
    00190       skipCR = true;
    00191     bool isLineTerminator = cr || lf;
    00192
    00193     switch (state) {
    00194     case Start:
    00195       if (isWhiteSpace(current)) {
    00196         // do nothing
    00197       } else if (current == '/' && next1 == '/') {
    00198         shift(1);
    00199         state = InSingleLineComment;
    00200       } else if (current == '/' && next1 == '*') {
    00201         shift(1);
    00202         state = InMultiLineComment;
    00203       } else if (current == 0) {
    00204         if (!terminator && !delimited) {
    00205           // automatic semicolon insertion if program incomplete
    00206           token = ';';
    00207           stackToken = 0;
    00208           setDone(Other);
    00209         } else
    00210           setDone(Eof);
    00211       } else if (isLineTerminator) {
    00212         nextLine();
    00213         terminator = true;
    00214         if (restrKeyword) {
    00215           token = ';';
    00216           setDone(Other);
    00217         }
    00218       } else if (current == '"' || current == '\'') {
    00219         state = InString;
    00220         stringType = current;
    00221       } else if (isIdentLetter(current)) {
    00222         record16(current);
    00223         state = InIdentifier;
    00224       } else if (current == '0') {
    00225         record8(current);
    00226         state = InNum0;
    00227       } else if (isDecimalDigit(current)) {
    00228         record8(current);
    00229         state = InNum;
    00230       } else if (current == '.' && isDecimalDigit(next1)) {
    00231         record8(current);
    00232         state = InDecimal;
    00233 #ifndef KJS_PURE_ECMA
    00234         // <!-- marks the beginning of a line comment (for www usage)
    00235       } else if (current == '<' && next1 == '!' &&
    00236                  next2 == '-' && next3 == '-') {
    00237         shift(3);
    00238         state = InSingleLineComment;
    00239         // same for -->
    00240       } else if (bol && current == '-' && next1 == '-' &&  next2 == '>') {
    00241         shift(2);
    00242         state = InSingleLineComment;
    00243 #endif
    00244       } else {
    00245         token = matchPunctuator(current, next1, next2, next3);
    00246         if (token != -1) {
    00247           setDone(Other);
    00248         } else {
    00249           //      cerr << "encountered unknown character" << endl;
    00250           setDone(Bad);
    00251         }
    00252       }
    00253       break;
    00254     case InString:
    00255       if (current == stringType) {
    00256         shift(1);
    00257         setDone(String);
    00258       } else if (current == 0 || isLineTerminator) {
    00259         setDone(Bad);
    00260       } else if (current == '\\') {
    00261         state = InEscapeSequence;
    00262       } else {
    00263         record16(current);
    00264       }
    00265       break;
    00266     // Escape Sequences inside of strings
    00267     case InEscapeSequence:
    00268       if (isOctalDigit(current)) {
    00269         if (current >= '0' && current <= '3' &&
    00270             isOctalDigit(next1) && isOctalDigit(next2)) {
    00271           record16(convertOctal(current, next1, next2));
    00272           shift(2);
    00273           state = InString;
    00274         } else if (isOctalDigit(current) && isOctalDigit(next1)) {
    00275           record16(convertOctal('0', current, next1));
    00276           shift(1);
    00277           state = InString;
    00278         } else if (isOctalDigit(current)) {
    00279           record16(convertOctal('0', '0', current));
    00280           state = InString;
    00281         } else {
    00282           setDone(Bad);
    00283         }
    00284       } else if (current == 'x')
    00285         state = InHexEscape;
    00286       else if (current == 'u')
    00287         state = InUnicodeEscape;
    00288       else {
    00289     if (isLineTerminator)
    00290       nextLine();
    00291         record16(singleEscape(current));
    00292         state = InString;
    00293       }
    00294       break;
    00295     case InHexEscape:
    00296       if (isHexDigit(current) && isHexDigit(next1)) {
    00297         state = InString;
    00298         record16(convertHex(current, next1));
    00299         shift(1);
    00300       } else if (current == stringType) {
    00301         record16('x');
    00302         shift(1);
    00303         setDone(String);
    00304       } else {
    00305         record16('x');
    00306         record16(current);
    00307         state = InString;
    00308       }
    00309       break;
    00310     case InUnicodeEscape:
    00311       if (isHexDigit(current) && isHexDigit(next1) &&
    00312           isHexDigit(next2) && isHexDigit(next3)) {
    00313         record16(convertUnicode(current, next1, next2, next3));
    00314         shift(3);
    00315         state = InString;
    00316       } else if (current == stringType) {
    00317         record16('u');
    00318         shift(1);
    00319         setDone(String);
    00320       } else {
    00321         setDone(Bad);
    00322       }
    00323       break;
    00324     case InSingleLineComment:
    00325       if (isLineTerminator) {
    00326         nextLine();
    00327         terminator = true;
    00328         if (restrKeyword) {
    00329           token = ';';
    00330           setDone(Other);
    00331         } else
    00332           state = Start;
    00333       } else if (current == 0) {
    00334         setDone(Eof);
    00335       }
    00336       break;
    00337     case InMultiLineComment:
    00338       if (current == 0) {
    00339         setDone(Bad);
    00340       } else if (isLineTerminator) {
    00341         nextLine();
    00342       } else if (current == '*' && next1 == '/') {
    00343         state = Start;
    00344         shift(1);
    00345       }
    00346       break;
    00347     case InIdentifier:
    00348       if (isIdentLetter(current) || isDecimalDigit(current)) {
    00349         record16(current);
    00350         break;
    00351       }
    00352       setDone(Identifier);
    00353       break;
    00354     case InNum0:
    00355       if (current == 'x' || current == 'X') {
    00356         record8(current);
    00357         state = InHex;
    00358       } else if (current == '.') {
    00359         record8(current);
    00360         state = InDecimal;
    00361       } else if (current == 'e' || current == 'E') {
    00362         record8(current);
    00363         state = InExponentIndicator;
    00364       } else if (isOctalDigit(current)) {
    00365         record8(current);
    00366         state = InOctal;
    00367       } else if (isDecimalDigit(current)) {
    00368         record8(current);
    00369         state = InDecimal;
    00370       } else {
    00371         setDone(Number);
    00372       }
    00373       break;
    00374     case InHex:
    00375       if (isHexDigit(current)) {
    00376         record8(current);
    00377       } else {
    00378         setDone(Hex);
    00379       }
    00380       break;
    00381     case InOctal:
    00382       if (isOctalDigit(current)) {
    00383         record8(current);
    00384       }
    00385       else if (isDecimalDigit(current)) {
    00386         record8(current);
    00387         state = InDecimal;
    00388       } else
    00389         setDone(Octal);
    00390       break;
    00391     case InNum:
    00392       if (isDecimalDigit(current)) {
    00393         record8(current);
    00394       } else if (current == '.') {
    00395         record8(current);
    00396         state = InDecimal;
    00397       } else if (current == 'e' || current == 'E') {
    00398         record8(current);
    00399         state = InExponentIndicator;
    00400       } else
    00401         setDone(Number);
    00402       break;
    00403     case InDecimal:
    00404       if (isDecimalDigit(current)) {
    00405         record8(current);
    00406       } else if (current == 'e' || current == 'E') {
    00407         record8(current);
    00408         state = InExponentIndicator;
    00409       } else
    00410         setDone(Number);
    00411       break;
    00412     case InExponentIndicator:
    00413       if (current == '+' || current == '-') {
    00414         record8(current);
    00415       } else if (isDecimalDigit(current)) {
    00416         record8(current);
    00417         state = InExponent;
    00418       } else
    00419         setDone(Bad);
    00420       break;
    00421     case InExponent:
    00422       if (isDecimalDigit(current)) {
    00423         record8(current);
    00424       } else
    00425         setDone(Number);
    00426       break;
    00427     default:
    00428       assert(!"Unhandled state in switch statement");
    00429     }
    00430
    00431     // move on to the next character
    00432     if (!done)
    00433       shift(1);
    00434 #ifndef KJS_PURE_ECMA
    00435     if (state != Start && state != InSingleLineComment)
    00436       bol = false;
    00437 #endif
    00438   }
    00439
    00440   // no identifiers allowed directly after numeric literal, e.g. "3in" is bad
    00441   if ((state == Number || state == Octal || state == Hex)
    00442       && isIdentLetter(current))
    00443     state = Bad;
    00444
    00445   // terminate string
    00446   buffer8[pos8] = '\0';
    00447
    00448 #ifdef KJS_DEBUG_LEX
    00449   fprintf(stderr, "line: %d ", lineNo());
    00450   fprintf(stderr, "yytext (%x): ", buffer8[0]);
    00451   fprintf(stderr, "%s ", buffer8);
    00452 #endif
    00453
    00454   long double dval = 0;
    00455   if (state == Number) {
    00456     dval = strtod(buffer8, 0L);
    00457   } else if (state == Hex) { // scan hex numbers
    00458     dval = 0;
    00459     if (buffer8[0] == '0' && (buffer8[1] == 'x' || buffer8[1] == 'X')) {
    00460       for (const char *p = buffer8+2; *p; p++) {
    00461     if (!isHexDigit(*p)) {
    00462       dval = 0;
    00463       break;
    00464     }
    00465     dval = dval * 16 + convertHex(*p);
    00466       }
    00467     }
    00468     state = Number;
    00469   } else if (state == Octal) {   // scan octal number
    00470     dval = 0;
    00471     if (buffer8[0] == '0') {
    00472       for (const char *p = buffer8+1; *p; p++) {
    00473     if (*p < '0' || *p > '7') {
    00474       dval = 0;
    00475       break;
    00476     }
    00477     dval = dval * 8 + *p - '0';
    00478       }
    00479     }
    00480     state = Number;
    00481   }
    00482
    00483 #ifdef KJS_DEBUG_LEX
    00484   switch (state) {
    00485   case Eof:
    00486     printf("(EOF)\n");
    00487     break;
    00488   case Other:
    00489     printf("(Other)\n");
    00490     break;
    00491   case Identifier:
    00492     printf("(Identifier)/(Keyword)\n");
    00493     break;
    00494   case String:
    00495     printf("(String)\n");
    00496     break;
    00497   case Number:
    00498     printf("(Number)\n");
    00499     break;
    00500   default:
    00501     printf("(unknown)");
    00502   }
    00503 #endif
    00504
    00505   if (state != Identifier && eatNextIdentifier)
    00506     eatNextIdentifier = false;
    00507
    00508   restrKeyword = false;
    00509   delimited = false;
    00510   yylloc.first_line = yylineno; // ???
    00511   yylloc.last_line = yylineno;
    00512
    00513   switch (state) {
    00514   case Eof:
    00515     token = 0;
    00516     break;
    00517   case Other:
    00518     if(token == '}' || token == ';') {
    00519       delimited = true;
    00520     }
    00521     break;
    00522   case Identifier:
    00523     if ((token = Lookup::find(&mainTable, buffer16, pos16)) < 0) {
    00524       // Lookup for keyword failed, means this is an identifier
    00525       // Apply anonymous-function hack below (eat the identifier)
    00526       if (eatNextIdentifier) {
    00527         eatNextIdentifier = false;
    00528 #ifdef KJS_VERBOSE
    00529         UString debugstr(buffer16, pos16); fprintf(stderr,"Anonymous function hack: eating identifier %s\n",debugstr.ascii());
    00530 #endif
    00531         token = lex();
    00532         break;
    00533       }
    00534       /* TODO: close leak on parse error. same holds true for String */
    00535       kjsyylval.ident = makeIdentifier(buffer16, pos16);
    00536       token = IDENT;
    00537       break;
    00538     }
    00539
    00540     eatNextIdentifier = false;
    00541     // Hack for "f = function somename() { ... }", too hard to get into the grammar
    00542     // Same for building an array with function pointers ( 'name', func1, 'name2', func2 )
    00543     // There are lots of other uses, we really have to get this into the grammar
    00544     if ( token == FUNCTION &&
    00545          ( lastToken == '=' || lastToken == ',' || lastToken == '(' ) )
    00546             eatNextIdentifier = true;
    00547
    00548     if (token == CONTINUE || token == BREAK ||
    00549         token == RETURN || token == THROW)
    00550       restrKeyword = true;
    00551     break;
    00552   case String:
    00553     kjsyylval.ustr = makeUString(buffer16, pos16);
    00554     token = STRING;
    00555     break;
    00556   case Number:
    00557     kjsyylval.dval = dval;
    00558     token = NUMBER;
    00559     break;
    00560   case Bad:
    00561     foundBad = true;
    00562     return -1;
    00563   default:
    00564     assert(!"unhandled numeration value in switch");
    00565     return -1;
    00566   }
    00567   lastToken = token;
    00568   return token;
    00569 }
    00570
    00571 bool Lexer::isWhiteSpace(unsigned short c)
    00572 {
    00573   return (c == ' ' || c == '\t' ||
    00574           c == 0x0b || c == 0x0c || c == 0xa0);
    00575 }
    00576
    00577 bool Lexer::isIdentLetter(unsigned short c)
    00578 {
    00579   // Allow any character in the Unicode categories
    00580   // Uppercase letter (Lu), Lowercase letter (Ll),
    00581   // Titlecase letter (Lt)", Modifier letter (Lm),
    00582   // Other letter (Lo), or Letter number (Nl).
    00583   // Also see: http://www.unicode.org/Public/UNIDATA/UnicodeData.txt */
    00584   return (c >= 'a' && c <= 'z' ||
    00585           c >= 'A' && c <= 'Z' ||
    00586           // A with grave - O with diaeresis
    00587           c >= 0x00c0 && c <= 0x00d6 ||
    00588           // O with stroke - o with diaeresis
    00589           c >= 0x00d8 && c <= 0x00f6 ||
    00590           // o with stroke - turned h with fishook and tail
    00591           c >= 0x00f8 && c <= 0x02af ||
    00592           // Greek etc. TODO: not precise
    00593           c >= 0x0388 && c <= 0x1ffc ||
    00594           c == '$' || c == '_');
    00595   /* TODO: use complete category table */
    00596 }
    00597
    00598 bool Lexer::isDecimalDigit(unsigned short c)
    00599 {
    00600   return (c >= '0' && c <= '9');
    00601 }
    00602
    00603 bool Lexer::isHexDigit(unsigned short c)
    00604 {
    00605   return (c >= '0' && c <= '9' ||
    00606           c >= 'a' && c <= 'f' ||
    00607           c >= 'A' && c <= 'F');
    00608 }
    00609
    00610 bool Lexer::isOctalDigit(unsigned short c)
    00611 {
    00612   return (c >= '0' && c <= '7');
    00613 }
    00614
    00615 int Lexer::matchPunctuator(unsigned short c1, unsigned short c2,
    00616                               unsigned short c3, unsigned short c4)
    00617 {
    00618   if (c1 == '>' && c2 == '>' && c3 == '>' && c4 == '=') {
    00619     shift(4);
    00620     return URSHIFTEQUAL;
    00621   } else if (c1 == '=' && c2 == '=' && c3 == '=') {
    00622     shift(3);
    00623     return STREQ;
    00624   } else if (c1 == '!' && c2 == '=' && c3 == '=') {
    00625     shift(3);
    00626     return STRNEQ;
    00627    } else if (c1 == '>' && c2 == '>' && c3 == '>') {
    00628     shift(3);
    00629     return URSHIFT;
    00630   } else if (c1 == '<' && c2 == '<' && c3 == '=') {
    00631     shift(3);
    00632     return LSHIFTEQUAL;
    00633   } else if (c1 == '>' && c2 == '>' && c3 == '=') {
    00634     shift(3);
    00635     return RSHIFTEQUAL;
    00636   } else if (c1 == '<' && c2 == '=') {
    00637     shift(2);
    00638     return LE;
    00639   } else if (c1 == '>' && c2 == '=') {
    00640     shift(2);
    00641     return GE;
    00642   } else if (c1 == '!' && c2 == '=') {
    00643     shift(2);
    00644     return NE;
    00645   } else if (c1 == '+' && c2 == '+') {
    00646     shift(2);
    00647     if (terminator)
    00648       return AUTOPLUSPLUS;
    00649     else
    00650       return PLUSPLUS;
    00651   } else if (c1 == '-' && c2 == '-') {
    00652     shift(2);
    00653     if (terminator)
    00654       return AUTOMINUSMINUS;
    00655     else
    00656       return MINUSMINUS;
    00657   } else if (c1 == '=' && c2 == '=') {
    00658     shift(2);
    00659     return EQEQ;
    00660   } else if (c1 == '+' && c2 == '=') {
    00661     shift(2);
    00662     return PLUSEQUAL;
    00663   } else if (c1 == '-' && c2 == '=') {
    00664     shift(2);
    00665     return MINUSEQUAL;
    00666   } else if (c1 == '*' && c2 == '=') {
    00667     shift(2);
    00668     return MULTEQUAL;
    00669   } else if (c1 == '/' && c2 == '=') {
    00670     shift(2);
    00671     return DIVEQUAL;
    00672   } else if (c1 == '&' && c2 == '=') {
    00673     shift(2);
    00674     return ANDEQUAL;
    00675   } else if (c1 == '^' && c2 == '=') {
    00676     shift(2);
    00677     return XOREQUAL;
    00678   } else if (c1 == '%' && c2 == '=') {
    00679     shift(2);
    00680     return MODEQUAL;
    00681   } else if (c1 == '|' && c2 == '=') {
    00682     shift(2);
    00683     return OREQUAL;
    00684   } else if (c1 == '<' && c2 == '<') {
    00685     shift(2);
    00686     return LSHIFT;
    00687   } else if (c1 == '>' && c2 == '>') {
    00688     shift(2);
    00689     return RSHIFT;
    00690   } else if (c1 == '&' && c2 == '&') {
    00691     shift(2);
    00692     return AND;
    00693   } else if (c1 == '|' && c2 == '|') {
    00694     shift(2);
    00695     return OR;
    00696   }
    00697
    00698   switch(c1) {
    00699     case '=':
    00700     case '>':
    00701     case '<':
    00702     case ',':
    00703     case '!':
    00704     case '~':
    00705     case '?':
    00706     case ':':
    00707     case '.':
    00708     case '+':
    00709     case '-':
    00710     case '*':
    00711     case '/':
    00712     case '&':
    00713     case '|':
    00714     case '^':
    00715     case '%':
    00716     case '(':
    00717     case ')':
    00718     case '{':
    00719     case '}':
    00720     case '[':
    00721     case ']':
    00722     case ';':
    00723       shift(1);
    00724       return static_cast<int>(c1);
    00725     default:
    00726       return -1;
    00727   }
    00728 }
    00729
    00730 unsigned short Lexer::singleEscape(unsigned short c) const
    00731 {
    00732   switch(c) {
    00733   case 'b':
    00734     return 0x08;
    00735   case 't':
    00736     return 0x09;
    00737   case 'n':
    00738     return 0x0A;
    00739   case 'v':
    00740     return 0x0B;
    00741   case 'f':
    00742     return 0x0C;
    00743   case 'r':
    00744     return 0x0D;
    00745   case '"':
    00746     return 0x22;
    00747   case '\'':
    00748     return 0x27;
    00749   case '\\':
    00750     return 0x5C;
    00751   default:
    00752     return c;
    00753   }
    00754 }
    00755
    00756 unsigned short Lexer::convertOctal(unsigned short c1, unsigned short c2,
    00757                                       unsigned short c3) const
    00758 {
    00759   return ((c1 - '0') * 64 + (c2 - '0') * 8 + c3 - '0');
    00760 }
    00761
    00762 unsigned char Lexer::convertHex(unsigned short c)
    00763 {
    00764   if (c >= '0' && c <= '9')
    00765     return (c - '0');
    00766   else if (c >= 'a' && c <= 'f')
    00767     return (c - 'a' + 10);
    00768   else
    00769     return (c - 'A' + 10);
    00770 }
    00771
    00772 unsigned char Lexer::convertHex(unsigned short c1, unsigned short c2)
    00773 {
    00774   return ((convertHex(c1) << 4) + convertHex(c2));
    00775 }
    00776
    00777 UChar Lexer::convertUnicode(unsigned short c1, unsigned short c2,
    00778                                      unsigned short c3, unsigned short c4)
    00779 {
    00780   return UChar((convertHex(c1) << 4) + convertHex(c2),
    00781                (convertHex(c3) << 4) + convertHex(c4));
    00782 }
    00783
    00784 void Lexer::record8(unsigned short c)
    00785 {
    00786   assert(c <= 0xff);
    00787
    00788   // enlarge buffer if full
    00789   if (pos8 >= size8 - 1) {
    00790     char *tmp = new char[2 * size8];
    00791     memcpy(tmp, buffer8, size8 * sizeof(char));
    00792     delete [] buffer8;
    00793     buffer8 = tmp;
    00794     size8 *= 2;
    00795   }
    00796
    00797   buffer8[pos8++] = (char) c;
    00798 }
    00799
    00800 void Lexer::record16(UChar c)
    00801 {
    00802   // enlarge buffer if full
    00803   if (pos16 >= size16 - 1) {
    00804     UChar *tmp = new UChar[2 * size16];
    00805     memcpy(tmp, buffer16, size16 * sizeof(UChar));
    00806     delete [] buffer16;
    00807     buffer16 = tmp;
    00808     size16 *= 2;
    00809   }
    00810
    00811   buffer16[pos16++] = c;
    00812 }
    00813
    00814 bool Lexer::scanRegExp()
    00815 {
    00816   pos16 = 0;
    00817   bool lastWasEscape = false;
    00818   bool inBrackets = false;
    00819
    00820   while (1) {
    00821     if (current == '\r' || current == '\n' || current == 0)
    00822       return false;
    00823     else if (current != '/' || lastWasEscape == true || inBrackets == true)
    00824     {
    00825         // keep track of '[' and ']'
    00826         if ( !lastWasEscape ) {
    00827           if ( current == '[' && !inBrackets )
    00828             inBrackets = true;
    00829           if ( current == ']' && inBrackets )
    00830             inBrackets = false;
    00831         }
    00832         record16(current);
    00833         lastWasEscape =
    00834             !lastWasEscape && (current == '\\');
    00835     }
    00836     else { // end of regexp
    00837       pattern = UString(buffer16, pos16);
    00838       pos16 = 0;
    00839       shift(1);
    00840       break;
    00841     }
    00842     shift(1);
    00843   }
    00844
    00845   while (isIdentLetter(current)) {
    00846     record16(current);
    00847     shift(1);
    00848   }
    00849   flags = UString(buffer16, pos16);
    00850
    00851   return true;
    00852 }
    00853
    00854
    00855 void Lexer::doneParsing()
    00856 {
    00857   for (unsigned i = 0; i < numIdentifiers; i++) {
    00858     delete identifiers[i];
    00859   }
    00860   free(identifiers);
    00861   identifiers = 0;
    00862   numIdentifiers = 0;
    00863   identifiersCapacity = 0;
    00864
    00865   for (unsigned i = 0; i < numStrings; i++) {
    00866     delete strings[i];
    00867   }
    00868   free(strings);
    00869   strings = 0;
    00870   numStrings = 0;
    00871   stringsCapacity = 0;
    00872 }
    00873
    00874 const int initialCapacity = 64;
    00875 const int growthFactor = 2;
    00876
    00877 Identifier *Lexer::makeIdentifier(UChar *buffer, unsigned int pos)
    00878 {
    00879   if (numIdentifiers == identifiersCapacity) {
    00880     identifiersCapacity = (identifiersCapacity == 0) ? initialCapacity : identifiersCapacity *growthFactor;
    00881     identifiers = (KJS::Identifier **)realloc(identifiers, sizeof(KJS::Identifier *) * identifiersCapacity);
    00882   }
    00883
    00884   KJS::Identifier *identifier = new KJS::Identifier(buffer, pos);
    00885   identifiers[numIdentifiers++] = identifier;
    00886   return identifier;
    00887 }
    00888
    00889 UString *Lexer::makeUString(UChar *buffer, unsigned int pos)
    00890 {
    00891   if (numStrings == stringsCapacity) {
    00892     stringsCapacity = (stringsCapacity == 0) ? initialCapacity : stringsCapacity *growthFactor;
    00893     strings = (UString **)realloc(strings, sizeof(UString *) * stringsCapacity);
    00894   }
    00895
    00896   UString *string = new UString(buffer, pos);
    00897   strings[numStrings++] = string;
    00898   return string;
    00899 }

This file is part of the documentation for kjs Library Version 3.4.1.
Documentation copyright © 1996-2004 the KDE developers.
Generated on Sat Jun 11 20:23:06 2005 by doxygen 1.4.1 written by Dimitri van Heesch, © 1997-2003