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regexp_object.cpp
1/*
2 * This file is part of the KDE libraries
3 * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
4 * Copyright (C) 2003 Apple Computer, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 */
21
22#include <stdio.h>
23
24#include "value.h"
25#include "object.h"
26#include "types.h"
27#include "interpreter.h"
28#include "operations.h"
29#include "internal.h"
30#include "regexp.h"
31#include "regexp_object.h"
32#include "error_object.h"
33#include "lookup.h"
34
35using namespace KJS;
36
37// ------------------------------ RegExpPrototypeImp ---------------------------
38
39// ECMA 15.9.4
40
41const ClassInfo RegExpPrototypeImp::info = {"RegExp", 0, 0, 0};
42
43RegExpPrototypeImp::RegExpPrototypeImp(ExecState *exec,
44 ObjectPrototypeImp *objProto,
45 FunctionPrototypeImp *funcProto)
46 : ObjectImp(objProto)
47{
48 Value protect(this);
49 setInternalValue(String(""));
50
51 // The constructor will be added later in RegExpObject's constructor (?)
52
53 static const Identifier execPropertyName("exec");
54 putDirect(execPropertyName,
55 new RegExpProtoFuncImp(exec,funcProto,RegExpProtoFuncImp::Exec, 0, execPropertyName), DontEnum);
56 static const Identifier testPropertyName("test");
57 putDirect(testPropertyName,
58 new RegExpProtoFuncImp(exec,funcProto,RegExpProtoFuncImp::Test, 0, testPropertyName), DontEnum);
59 putDirect(toStringPropertyName,
60 new RegExpProtoFuncImp(exec,funcProto,RegExpProtoFuncImp::ToString, 0, toStringPropertyName), DontEnum);
61 static const Identifier compilePropertyName("compile");
62 putDirect(compilePropertyName,
63 new RegExpProtoFuncImp(exec,funcProto,RegExpProtoFuncImp::Compile, 1, compilePropertyName), DontEnum);
64}
65
66// ------------------------------ RegExpProtoFuncImp ---------------------------
67
68RegExpProtoFuncImp::RegExpProtoFuncImp(ExecState * /*exec*/, FunctionPrototypeImp *funcProto,
69 int i, int len, const Identifier &_ident)
70 : InternalFunctionImp(funcProto), id(i)
71{
72 Value protect(this);
73 putDirect(lengthPropertyName, len, DontDelete|ReadOnly|DontEnum);
74 ident = _ident;
75}
76
77bool RegExpProtoFuncImp::implementsCall() const
78{
79 return true;
80}
81
82Value RegExpProtoFuncImp::call(ExecState *exec, Object &thisObj, const List &args)
83{
84 if (!thisObj.inherits(&RegExpImp::info)) {
85 if (thisObj.inherits(&RegExpPrototypeImp::info)) {
86 switch (id) {
87 case ToString: return String("//"); // FireFox returns /(?:)/
88 }
89 }
90 Object err = Error::create(exec,TypeError);
91 exec->setException(err);
92 return err;
93 }
94
95 RegExpImp *reimp = static_cast<RegExpImp*>(thisObj.imp());
96 RegExp *re = reimp->regExp();
97 String s;
98 UString str;
99 switch (id) {
100 case Exec: // 15.10.6.2
101 case Test:
102 {
103 s = args[0].toString(exec);
104 int length = s.value().size();
105
106 // Get values from the last time (in case of /g)
107 Value lastIndex = thisObj.get(exec,"lastIndex");
108 int i = lastIndex.isValid() ? lastIndex.toInt32(exec) : 0;
109 bool globalFlag = thisObj.get(exec,"global").toBoolean(exec);
110 if (!globalFlag)
111 i = 0;
112 if (i < 0 || i > length) {
113 thisObj.put(exec,"lastIndex", Number(0), DontDelete | DontEnum);
114 if (id == Test)
115 return Boolean(false);
116 else
117 return Null();
118 }
119 RegExpObjectImp* regExpObj = static_cast<RegExpObjectImp*>(exec->lexicalInterpreter()->builtinRegExp().imp());
120 int **ovector = regExpObj->registerRegexp( re, s.value() );
121
122 re->prepareMatch(s.value());
123 str = re->match(s.value(), i, 0L, ovector);
124 re->doneMatch();
125 regExpObj->setSubPatterns(re->subPatterns());
126
127 if (id == Test)
128 return Boolean(!str.isNull());
129
130 if (str.isNull()) // no match
131 {
132 if (globalFlag)
133 thisObj.put(exec,"lastIndex",Number(0), DontDelete | DontEnum);
134 return Null();
135 }
136 else // success
137 {
138 if (globalFlag)
139 thisObj.put(exec,"lastIndex",Number( (*ovector)[1] ), DontDelete | DontEnum);
140 return regExpObj->arrayOfMatches(exec,str);
141 }
142 }
143 break;
144 case ToString:
145 s = thisObj.get(exec,"source").toString(exec);
146 str = "/";
147 str += s.value();
148 str += "/";
149 if (thisObj.get(exec,"global").toBoolean(exec)) {
150 str += "g";
151 }
152 if (thisObj.get(exec,"ignoreCase").toBoolean(exec)) {
153 str += "i";
154 }
155 if (thisObj.get(exec,"multiline").toBoolean(exec)) {
156 str += "m";
157 }
158 return String(str);
159 case Compile: {
160 RegExp* newEngine = RegExpObjectImp::makeEngine(exec, args[0].toString(exec), args[1]);
161 if (!newEngine)
162 return exec->exception();
163 reimp->setRegExp(newEngine);
164 return Value(reimp);
165 }
166 }
167
168
169 return Undefined();
170}
171
172// ------------------------------ RegExpImp ------------------------------------
173
174const ClassInfo RegExpImp::info = {"RegExp", 0, 0, 0};
175
176RegExpImp::RegExpImp(RegExpPrototypeImp *regexpProto)
177 : ObjectImp(regexpProto), reg(0L)
178{
179}
180
181RegExpImp::~RegExpImp()
182{
183 delete reg;
184}
185
186void RegExpImp::setRegExp(RegExp *r)
187{
188 delete reg;
189 reg = r;
190
191 Object protect(this);//Protect self from GC (we are allocating a StringImp, and may be new)
192 putDirect("global", (r->flags() & RegExp::Global) ? BooleanImp::staticTrue : BooleanImp::staticFalse,
193 DontDelete | ReadOnly | DontEnum);
194 putDirect("ignoreCase", (r->flags() & RegExp::IgnoreCase) ? BooleanImp::staticTrue : BooleanImp::staticFalse,
195 DontDelete | ReadOnly | DontEnum);
196 putDirect("multiline", (r->flags() & RegExp::Multiline) ? BooleanImp::staticTrue : BooleanImp::staticFalse,
197 DontDelete | ReadOnly | DontEnum);
198
199 putDirect("source", new StringImp(r->pattern()), DontDelete | ReadOnly | DontEnum);
200 putDirect("lastIndex", NumberImp::zero(), DontDelete | DontEnum);
201}
202
203// ------------------------------ RegExpObjectImp ------------------------------
204
205RegExpObjectImp::RegExpObjectImp(ExecState * /*exec*/,
206 FunctionPrototypeImp *funcProto,
207 RegExpPrototypeImp *regProto)
208
209 : InternalFunctionImp(funcProto), lastOvector(0L), lastNrSubPatterns(0)
210{
211 Value protect(this);
212 // ECMA 15.10.5.1 RegExp.prototype
213 putDirect(prototypePropertyName, regProto, DontEnum|DontDelete|ReadOnly);
214
215 // no. of arguments for constructor
216 putDirect(lengthPropertyName, NumberImp::two(), ReadOnly|DontDelete|DontEnum);
217}
218
219RegExpObjectImp::~RegExpObjectImp()
220{
221 delete [] lastOvector;
222}
223
224int **RegExpObjectImp::registerRegexp( const RegExp* re, const UString& s )
225{
226 lastString = s;
227 delete [] lastOvector;
228 lastOvector = 0;
229 lastNrSubPatterns = re->subPatterns();
230 return &lastOvector;
231}
232
233Object RegExpObjectImp::arrayOfMatches(ExecState *exec, const UString &result) const
234{
235 List list;
236 // The returned array contains 'result' as first item, followed by the list of matches
237 list.append(String(result));
238 if ( lastOvector )
239 for ( unsigned int i = 1 ; i < lastNrSubPatterns + 1 ; ++i )
240 {
241 UString substring = lastString.substr( lastOvector[2*i], lastOvector[2*i+1] - lastOvector[2*i] );
242 list.append(String(substring));
243 }
244 Object arr = exec->lexicalInterpreter()->builtinArray().construct(exec, list);
245 arr.put(exec, "index", Number(lastOvector[0]));
246 arr.put(exec, "input", String(lastString));
247 return arr;
248}
249
250Value RegExpObjectImp::get(ExecState *exec, const Identifier &p) const
251{
252 UString s = p.ustring();
253 if (s[0] == '$' && lastOvector)
254 {
255 bool ok;
256 unsigned long i = s.substr(1).toULong(&ok);
257 if (ok)
258 {
259 if (i < lastNrSubPatterns + 1)
260 {
261 UString substring = lastString.substr( lastOvector[2*i], lastOvector[2*i+1] - lastOvector[2*i] );
262 return String(substring);
263 }
264 return String("");
265 }
266 }
267 return InternalFunctionImp::get(exec, p);
268}
269
270bool RegExpObjectImp::hasProperty(ExecState *exec, const Identifier &p) const
271{
272 UString s = p.ustring();
273 if (s[0] == '$' && lastOvector) {
274 bool ok;
275 (void)s.substr(1).toULong(&ok);
276 if (ok)
277 return true;
278 }
279
280 return InternalFunctionImp::hasProperty(exec, p);
281}
282
283bool RegExpObjectImp::implementsConstruct() const
284{
285 return true;
286}
287
288RegExp* RegExpObjectImp::makeEngine(ExecState *exec, const UString &p, const Value &flagsInput)
289{
290 UString flags = flagsInput.type() == UndefinedType ? UString("") : flagsInput.toString(exec);
291
292 // Check for validity of flags
293 for (int pos = 0; pos < flags.size(); ++pos) {
294 switch (flags[pos].unicode()) {
295 case 'g':
296 case 'i':
297 case 'm':
298 break;
299 default: {
300 Object err = Error::create(exec, SyntaxError,
301 "Invalid regular expression flags");
302 exec->setException(err);
303 return 0;
304 }
305 }
306 }
307
308 bool global = (flags.find("g") >= 0);
309 bool ignoreCase = (flags.find("i") >= 0);
310 bool multiline = (flags.find("m") >= 0);
311
312 int reflags = RegExp::None;
313 if (global)
314 reflags |= RegExp::Global;
315 if (ignoreCase)
316 reflags |= RegExp::IgnoreCase;
317 if (multiline)
318 reflags |= RegExp::Multiline;
319
320 RegExp *re = new RegExp(p, reflags);
321 if (!re->isValid()) {
322 Object err = Error::create(exec, SyntaxError,
323 "Invalid regular expression");
324 exec->setException(err);
325 delete re;
326 return 0;
327 }
328 return re;
329}
330
331// ECMA 15.10.4
332Object RegExpObjectImp::construct(ExecState *exec, const List &args)
333{
334 UString p;
335 if (args.isEmpty()) {
336 p = "";
337 } else {
338 Value a0 = args[0];
339 if (a0.isA(ObjectType) && a0.toObject(exec).inherits(&RegExpImp::info)) {
340 // It's a regexp. Check that no flags were passed.
341 if (args.size() > 1 && args[1].type() != UndefinedType) {
342 Object err = Error::create(exec,TypeError);
343 exec->setException(err);
344 return err;
345 }
346 RegExpImp *rimp = static_cast<RegExpImp*>(Object::dynamicCast(a0).imp());
347 p = rimp->regExp()->pattern();
348 } else {
349 p = a0.toString(exec);
350 }
351 }
352
353 RegExp* re = makeEngine(exec, p, args[1]);
354 if (!re)
355 return exec->exception().toObject(exec);
356
357 RegExpPrototypeImp *proto = static_cast<RegExpPrototypeImp*>(exec->lexicalInterpreter()->builtinRegExpPrototype().imp());
358 RegExpImp *dat = new RegExpImp(proto);
359 Object obj(dat); // protect from GC
360 dat->setRegExp(re);
361
362 return obj;
363}
364
365bool RegExpObjectImp::implementsCall() const
366{
367 return true;
368}
369
370// ECMA 15.10.3
371Value RegExpObjectImp::call(ExecState *exec, Object &/*thisObj*/,
372 const List &args)
373{
374 // TODO: handle RegExp argument case (15.10.3.1)
375
376 return construct(exec, args);
377}
KJS::Boolean
Represents an primitive Boolean value.
Definition: value.h:316
KJS::ExecState
Represents the current state of script execution.
Definition: interpreter.h:438
KJS::ExecState::lexicalInterpreter
Interpreter * lexicalInterpreter() const
Returns the interpreter associated with the current scope's global object.
Definition: interpreter.cpp:394
KJS::FunctionPrototypeImp
The initial value of Function.prototype (and thus all objects created with the Function constructor)
Definition: function_object.h:34
KJS::Identifier
Represents an Identifier for a Javascript object.
Definition: identifier.h:32
KJS::Identifier::ustring
const UString & ustring() const
returns a UString of the identifier
Definition: identifier.h:52
KJS::InternalFunctionImp
Base class for all function objects.
Definition: function.h:40
KJS::Interpreter::builtinRegExp
Object builtinRegExp() const
Returns the builtin "RegExp" object.
Definition: interpreter.cpp:208
KJS::Interpreter::builtinRegExpPrototype
Object builtinRegExpPrototype() const
Returns the builtin "RegExp.prototype" object.
Definition: interpreter.cpp:253
KJS::Interpreter::builtinArray
Object builtinArray() const
Returns the builtin "Array" object.
Definition: interpreter.cpp:183
KJS::List
Native list type.
Definition: list.h:48
KJS::List::append
void append(const Value &val)
Append an object to the end of the list.
Definition: list.h:66
KJS::List::isEmpty
bool isEmpty() const
Definition: list.h:86
KJS::List::size
int size() const
Definition: list.h:90
KJS::Null
Represents an primitive Null value.
Definition: value.h:294
KJS::Number
Represents an primitive Number value.
Definition: value.h:367
KJS::Object
Represents an Object.
Definition: object.h:81
KJS::Object::construct
Object construct(ExecState *exec, const List &args)
Creates a new object based on this object.
Definition: object.h:696
KJS::Object::put
void put(ExecState *exec, const Identifier &propertyName, const Value &value, int attr=None)
Sets the specified property.
Definition: object.h:669
KJS::Object::get
Value get(ExecState *exec, const Identifier &propertyName) const
Retrieves the specified property from the object.
Definition: object.h:663
KJS::String
Represents an primitive String value.
Definition: value.h:340
KJS::UString
Unicode string class.
Definition: ustring.h:189
KJS::UString::toULong
unsigned long toULong(bool *ok, bool tolerateEmptyString) const
Attempts an conversion to an unsigned long integer.
Definition: ustring.cpp:685
KJS::UString::find
int find(const UString &f, int pos=0) const
Definition: ustring.cpp:798
KJS::UString::isNull
bool isNull() const
Definition: ustring.h:343
KJS::UString::size
int size() const
Definition: ustring.h:359
KJS::UString::substr
UString substr(int pos=0, int len=-1) const
Definition: ustring.cpp:868
KJS::Undefined
Represents an primitive Undefined value.
Definition: value.h:269
KJS::Value
Value objects are act as wrappers ("smart pointers") around ValueImp objects and their descendents.
Definition: value.h:167
KJS::Value::toString
UString toString(ExecState *exec) const
Performs the ToString type conversion operation on this value (ECMA 9.8)
Definition: value.h:246
KJS::Value::isA
bool isA(Type t) const
Checks whether or not the value is of a particular tpye.
Definition: value.h:203
KJS::Value::toObject
Object toObject(ExecState *exec) const
Performs the ToObject type conversion operation on this value (ECMA 9.9)
Definition: object.h:358
KJS::Value::toInt32
int toInt32(ExecState *exec) const
Performs the ToInt32 type conversion operation on this value (ECMA 9.5)
Definition: value.h:231
KJS::Value::toBoolean
bool toBoolean(ExecState *exec) const
Performs the ToBoolean type conversion operation on this value (ECMA 9.2)
Definition: value.h:216
KJS::Value::isValid
bool isValid() const
Returns whether or not this is a valid value.
Definition: value.h:181
KJS::Value::type
Type type() const
Returns the type of value.
Definition: value.h:195
KJS::ClassInfo
Class Information.
Definition: object.h:58

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