runtime/JSGlobalObjectFunctions.cpp

   1 /*
   2  *  Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
   4  *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
   5  *  Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
   6  *  Copyright (C) 2007 Maks Orlovich
   7  *
   8  *  This library is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU Library General Public
  10  *  License as published by the Free Software Foundation; either
  11  *  version 2 of the License, or (at your option) any later version.
  12  *
  13  *  This library is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  Library General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU Library General Public License
  19  *  along with this library; see the file COPYING.LIB.  If not, write to
  20  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21  *  Boston, MA 02110-1301, USA.
  22  *
  23  */
  24
  25 #include "config.h"
  26 #include "JSGlobalObjectFunctions.h"
  27
  28 #include "CallFrame.h"
  29 #include "GlobalEvalFunction.h"
  30 #include "JSGlobalObject.h"
  31 #include "LiteralParser.h"
  32 #include "JSString.h"
  33 #include "Interpreter.h"
  34 #include "Parser.h"
  35 #include "dtoa.h"
  36 #include "Lexer.h"
  37 #include "Nodes.h"
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <wtf/ASCIICType.h>
  42 #include <wtf/Assertions.h>
  43 #include <wtf/MathExtras.h>
  44 #include <wtf/unicode/UTF8.h>
  45
  46 using namespace WTF;
  47 using namespace Unicode;
  48
  49 namespace JSC {
  50
  51 static JSValue encode(ExecState* exec, const ArgList& args, const char* doNotEscape)
  52 {
  53     UString str = args.at(0).toString(exec);
  54     CString cstr = str.UTF8String(true);
  55     if (!cstr.c_str())
  56         return throwError(exec, URIError, "String contained an illegal UTF-16 sequence.");
  57
  58     UString result = "";
  59     const char* p = cstr.c_str();
  60     for (size_t k = 0; k < cstr.size(); k++, p++) {
  61         char c = *p;
  62         if (c && strchr(doNotEscape, c))
  63             result.append(c);
  64         else {
  65             char tmp[4];
  66             snprintf(tmp, sizeof(tmp), "%%%02X", static_cast<unsigned char>(c));
  67             result += tmp;
  68         }
  69     }
  70     return jsString(exec, result);
  71 }
  72
  73 static JSValue decode(ExecState* exec, const ArgList& args, const char* doNotUnescape, bool strict)
  74 {
  75     UString result = "";
  76     UString str = args.at(0).toString(exec);
  77     int k = 0;
  78     int len = str.size();
  79     const UChar* d = str.data();
  80     UChar u = 0;
  81     while (k < len) {
  82         const UChar* p = d + k;
  83         UChar c = *p;
  84         if (c == '%') {
  85             int charLen = 0;
  86             if (k <= len - 3 && isASCIIHexDigit(p[1]) && isASCIIHexDigit(p[2])) {
  87                 const char b0 = Lexer::convertHex(p[1], p[2]);
  88                 const int sequenceLen = UTF8SequenceLength(b0);
  89                 if (sequenceLen != 0 && k <= len - sequenceLen * 3) {
  90                     charLen = sequenceLen * 3;
  91                     char sequence[5];
  92                     sequence[0] = b0;
  93                     for (int i = 1; i < sequenceLen; ++i) {
  94                         const UChar* q = p + i * 3;
  95                         if (q[0] == '%' && isASCIIHexDigit(q[1]) && isASCIIHexDigit(q[2]))
  96                             sequence[i] = Lexer::convertHex(q[1], q[2]);
  97                         else {
  98                             charLen = 0;
  99                             break;
 100                         }
 101                     }
 102                     if (charLen != 0) {
 103                         sequence[sequenceLen] = 0;
 104                         const int character = decodeUTF8Sequence(sequence);
 105                         if (character < 0 || character >= 0x110000)
 106                             charLen = 0;
 107                         else if (character >= 0x10000) {
 108                             // Convert to surrogate pair.
 109                             result.append(static_cast<UChar>(0xD800 | ((character - 0x10000) >> 10)));
 110                             u = static_cast<UChar>(0xDC00 | ((character - 0x10000) & 0x3FF));
 111                         } else
 112                             u = static_cast<UChar>(character);
 113                     }
 114                 }
 115             }
 116             if (charLen == 0) {
 117                 if (strict)
 118                     return throwError(exec, URIError);
 119                 // The only case where we don't use "strict" mode is the "unescape" function.
 120                 // For that, it's good to support the wonky "%u" syntax for compatibility with WinIE.
 121                 if (k <= len - 6 && p[1] == 'u'
 122                         && isASCIIHexDigit(p[2]) && isASCIIHexDigit(p[3])
 123                         && isASCIIHexDigit(p[4]) && isASCIIHexDigit(p[5])) {
 124                     charLen = 6;
 125                     u = Lexer::convertUnicode(p[2], p[3], p[4], p[5]);
 126                 }
 127             }
 128             if (charLen && (u == 0 || u >= 128 || !strchr(doNotUnescape, u))) {
 129                 c = u;
 130                 k += charLen - 1;
 131             }
 132         }
 133         k++;
 134         result.append(c);
 135     }
 136     return jsString(exec, result);
 137 }
 138
 139 bool isStrWhiteSpace(UChar c)
 140 {
 141     switch (c) {
 142         case 0x0009:
 143         case 0x000A:
 144         case 0x000B:
 145         case 0x000C:
 146         case 0x000D:
 147         case 0x0020:
 148         case 0x00A0:
 149         case 0x2028:
 150         case 0x2029:
 151             return true;
 152         default:
 153             return c > 0xff && isSeparatorSpace(c);
 154     }
 155 }
 156
 157 static int parseDigit(unsigned short c, int radix)
 158 {
 159     int digit = -1;
 160
 161     if (c >= '0' && c <= '9')
 162         digit = c - '0';
 163     else if (c >= 'A' && c <= 'Z')
 164         digit = c - 'A' + 10;
 165     else if (c >= 'a' && c <= 'z')
 166         digit = c - 'a' + 10;
 167
 168     if (digit >= radix)
 169         return -1;
 170     return digit;
 171 }
 172
 173 double parseIntOverflow(const char* s, int length, int radix)
 174 {
 175     double number = 0.0;
 176     double radixMultiplier = 1.0;
 177
 178     for (const char* p = s + length - 1; p >= s; p--) {
 179         if (radixMultiplier == Inf) {
 180             if (*p != '0') {
 181                 number = Inf;
 182                 break;
 183             }
 184         } else {
 185             int digit = parseDigit(*p, radix);
 186             number += digit * radixMultiplier;
 187         }
 188
 189         radixMultiplier *= radix;
 190     }
 191
 192     return number;
 193 }
 194
 195 static double parseInt(const UString& s, int radix)
 196 {
 197     int length = s.size();
 198     const UChar* data = s.data();
 199     int p = 0;
 200
 201     while (p < length && isStrWhiteSpace(data[p]))
 202         ++p;
 203
 204     double sign = 1;
 205     if (p < length) {
 206         if (data[p] == '+')
 207             ++p;
 208         else if (data[p] == '-') {
 209             sign = -1;
 210             ++p;
 211         }
 212     }
 213
 214     if ((radix == 0 || radix == 16) && length - p >= 2 && data[p] == '0' && (data[p + 1] == 'x' || data[p + 1] == 'X')) {
 215         radix = 16;
 216         p += 2;
 217     } else if (radix == 0) {
 218         if (p < length && data[p] == '0')
 219             radix = 8;
 220         else
 221             radix = 10;
 222     }
 223
 224     if (radix < 2 || radix > 36)
 225         return NaN;
 226
 227     int firstDigitPosition = p;
 228     bool sawDigit = false;
 229     double number = 0;
 230     while (p < length) {
 231         int digit = parseDigit(data[p], radix);
 232         if (digit == -1)
 233             break;
 234         sawDigit = true;
 235         number *= radix;
 236         number += digit;
 237         ++p;
 238     }
 239
 240     if (number >= mantissaOverflowLowerBound) {
 241         if (radix == 10)
 242             number = WTF::strtod(s.substr(firstDigitPosition, p - firstDigitPosition).ascii(), 0);
 243         else if (radix == 2 || radix == 4 || radix == 8 || radix == 16 || radix == 32)
 244             number = parseIntOverflow(s.substr(firstDigitPosition, p - firstDigitPosition).ascii(), p - firstDigitPosition, radix);
 245     }
 246
 247     if (!sawDigit)
 248         return NaN;
 249
 250     return sign * number;
 251 }
 252
 253 static double parseFloat(const UString& s)
 254 {
 255     // Check for 0x prefix here, because toDouble allows it, but we must treat it as 0.
 256     // Need to skip any whitespace and then one + or - sign.
 257     int length = s.size();
 258     const UChar* data = s.data();
 259     int p = 0;
 260     while (p < length && isStrWhiteSpace(data[p]))
 261         ++p;
 262
 263     if (p < length && (data[p] == '+' || data[p] == '-'))
 264         ++p;
 265
 266     if (length - p >= 2 && data[p] == '0' && (data[p + 1] == 'x' || data[p + 1] == 'X'))
 267         return 0;
 268
 269     return s.toDouble(true /*tolerant*/, false /* NaN for empty string */);
 270 }
 271
 272 JSValue JSC_HOST_CALL globalFuncEval(ExecState* exec, JSObject* function, JSValue thisValue, const ArgList& args)
 273 {
 274     JSObject* thisObject = thisValue.toThisObject(exec);
 275     JSObject* unwrappedObject = thisObject->unwrappedObject();
 276     if (!unwrappedObject->isGlobalObject() || static_cast<JSGlobalObject*>(unwrappedObject)->evalFunction() != function)
 277         return throwError(exec, EvalError, "The \"this\" value passed to eval must be the global object from which eval originated");
 278
 279     JSValue x = args.at(0);
 280     if (!x.isString())
 281         return x;
 282
 283     UString s = x.toString(exec);
 284
 285     LiteralParser preparser(exec, s, LiteralParser::NonStrictJSON);
 286     if (JSValue parsedObject = preparser.tryLiteralParse())
 287         return parsedObject;
 288
 289     int errLine;
 290     UString errMsg;
 291
 292     SourceCode source = makeSource(s);
 293     RefPtr<EvalNode> evalNode = exec->globalData().parser->parse<EvalNode>(exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);
 294
 295     if (!evalNode)
 296         return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), NULL);
 297
 298     return exec->interpreter()->execute(evalNode.get(), exec, thisObject, static_cast<JSGlobalObject*>(unwrappedObject)->globalScopeChain().node(), exec->exceptionSlot());
 299 }
 300
 301 JSValue JSC_HOST_CALL globalFuncParseInt(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 302 {
 303     JSValue value = args.at(0);
 304     int32_t radix = args.at(1).toInt32(exec);
 305
 306     if (radix != 0 && radix != 10)
 307         return jsNumber(exec, parseInt(value.toString(exec), radix));
 308
 309     if (value.isInt32())
 310         return value;
 311
 312     if (value.isDouble()) {
 313         double d = value.asDouble();
 314         if (isfinite(d))
 315             return jsNumber(exec, (d > 0) ? floor(d) : ceil(d));
 316         if (isnan(d) || isinf(d))
 317             return jsNaN(exec);
 318         return jsNumber(exec, 0);
 319     }
 320
 321     return jsNumber(exec, parseInt(value.toString(exec), radix));
 322 }
 323
 324 JSValue JSC_HOST_CALL globalFuncParseFloat(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 325 {
 326     return jsNumber(exec, parseFloat(args.at(0).toString(exec)));
 327 }
 328
 329 JSValue JSC_HOST_CALL globalFuncIsNaN(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 330 {
 331     return jsBoolean(isnan(args.at(0).toNumber(exec)));
 332 }
 333
 334 JSValue JSC_HOST_CALL globalFuncIsFinite(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 335 {
 336     double n = args.at(0).toNumber(exec);
 337     return jsBoolean(!isnan(n) && !isinf(n));
 338 }
 339
 340 JSValue JSC_HOST_CALL globalFuncDecodeURI(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 341 {
 342     static const char do_not_unescape_when_decoding_URI[] =
 343         "#$&+,/:;=?@";
 344
 345     return decode(exec, args, do_not_unescape_when_decoding_URI, true);
 346 }
 347
 348 JSValue JSC_HOST_CALL globalFuncDecodeURIComponent(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 349 {
 350     return decode(exec, args, "", true);
 351 }
 352
 353 JSValue JSC_HOST_CALL globalFuncEncodeURI(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 354 {
 355     static const char do_not_escape_when_encoding_URI[] =
 356         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 357         "abcdefghijklmnopqrstuvwxyz"
 358         "0123456789"
 359         "!#$&'()*+,-./:;=?@_~";
 360
 361     return encode(exec, args, do_not_escape_when_encoding_URI);
 362 }
 363
 364 JSValue JSC_HOST_CALL globalFuncEncodeURIComponent(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 365 {
 366     static const char do_not_escape_when_encoding_URI_component[] =
 367         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 368         "abcdefghijklmnopqrstuvwxyz"
 369         "0123456789"
 370         "!'()*-._~";
 371
 372     return encode(exec, args, do_not_escape_when_encoding_URI_component);
 373 }
 374
 375 JSValue JSC_HOST_CALL globalFuncEscape(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 376 {
 377     static const char do_not_escape[] =
 378         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 379         "abcdefghijklmnopqrstuvwxyz"
 380         "0123456789"
 381         "*+-./@_";
 382
 383     UString result = "";
 384     UString s;
 385     UString str = args.at(0).toString(exec);
 386     const UChar* c = str.data();
 387     for (int k = 0; k < str.size(); k++, c++) {
 388         int u = c[0];
 389         if (u > 255) {
 390             char tmp[7];
 391             snprintf(tmp, sizeof(tmp), "%%u%04X", u);
 392             s = UString(tmp);
 393         } else if (u != 0 && strchr(do_not_escape, static_cast<char>(u)))
 394             s = UString(c, 1);
 395         else {
 396             char tmp[4];
 397             snprintf(tmp, sizeof(tmp), "%%%02X", u);
 398             s = UString(tmp);
 399         }
 400         result += s;
 401     }
 402
 403     return jsString(exec, result);
 404 }
 405
 406 JSValue JSC_HOST_CALL globalFuncUnescape(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 407 {
 408     UString result = "";
 409     UString str = args.at(0).toString(exec);
 410     int k = 0;
 411     int len = str.size();
 412     while (k < len) {
 413         const UChar* c = str.data() + k;
 414         UChar u;
 415         if (c[0] == '%' && k <= len - 6 && c[1] == 'u') {
 416             if (isASCIIHexDigit(c[2]) && isASCIIHexDigit(c[3]) && isASCIIHexDigit(c[4]) && isASCIIHexDigit(c[5])) {
 417                 u = Lexer::convertUnicode(c[2], c[3], c[4], c[5]);
 418                 c = &u;
 419                 k += 5;
 420             }
 421         } else if (c[0] == '%' && k <= len - 3 && isASCIIHexDigit(c[1]) && isASCIIHexDigit(c[2])) {
 422             u = UChar(Lexer::convertHex(c[1], c[2]));
 423             c = &u;
 424             k += 2;
 425         }
 426         k++;
 427         result.append(*c);
 428     }
 429
 430     return jsString(exec, result);
 431 }
 432
 433 #ifndef NDEBUG
 434 JSValue JSC_HOST_CALL globalFuncJSCPrint(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 435 {
 436     CStringBuffer string;
 437     args.at(0).toString(exec).getCString(string);
 438     puts(string.data());
 439     return jsUndefined();
 440 }
 441 #endif
 442
 443 } // namespace JSC