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