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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
| 4 // This file encapsulates all the interaction with the | 4 // This file encapsulates all the interaction with the |
| 5 // JSC regular expression library also referred to as pcre | 5 // JSC regular expression library also referred to as pcre |
| 6 | 6 |
| 7 #include "lib/regexp_jsc.h" | 7 #include "lib/regexp_jsc.h" |
| 8 | 8 |
| 9 #include "platform/assert.h" | 9 #include "platform/assert.h" |
| 10 #include "vm/allocation.h" | 10 #include "vm/allocation.h" |
| 11 #include "vm/exceptions.h" | 11 #include "vm/exceptions.h" |
| 12 #include "vm/globals.h" | 12 #include "vm/globals.h" |
| 13 #include "vm/isolate.h" | 13 #include "vm/isolate.h" |
| 14 #include "third_party/jscre/pcre.h" | 14 #include "third_party/jscre/pcre.h" |
| 15 | 15 |
| 16 namespace dart { | 16 namespace dart { |
| 17 | 17 |
| 18 static uint16_t* GetTwoByteData(const String& str) { | 18 static uint16_t* GetTwoByteData(const String& str) { |
| 19 Zone* zone = Isolate::Current()->current_zone(); | 19 StackZone* zone = Isolate::Current()->current_zone(); |
| 20 uint16_t* two_byte_str = zone->Alloc<uint16_t>(str.Length()); | 20 uint16_t* two_byte_str = zone->Alloc<uint16_t>(str.Length()); |
| 21 for (intptr_t i = 0; i < str.Length(); i++) { | 21 for (intptr_t i = 0; i < str.Length(); i++) { |
| 22 two_byte_str[i] = str.CharAt(i); | 22 two_byte_str[i] = str.CharAt(i); |
| 23 } | 23 } |
| 24 return two_byte_str; | 24 return two_byte_str; |
| 25 } | 25 } |
| 26 | 26 |
| 27 | 27 |
| 28 static void* JSREMalloc(size_t size) { | 28 static void* JSREMalloc(size_t size) { |
| 29 intptr_t regexp_size = static_cast<intptr_t>(size); | 29 intptr_t regexp_size = static_cast<intptr_t>(size); |
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| 110 // First convert the input str to UTF16 format as the jscre library expects | 110 // First convert the input str to UTF16 format as the jscre library expects |
| 111 // strings to be in UTF16 encoding. | 111 // strings to be in UTF16 encoding. |
| 112 uint16_t* two_byte_str = GetTwoByteData(str); | 112 uint16_t* two_byte_str = GetTwoByteData(str); |
| 113 | 113 |
| 114 // Execute a regex match by calling into the jscre library. | 114 // Execute a regex match by calling into the jscre library. |
| 115 jscre::JSRegExp* jscregexp = | 115 jscre::JSRegExp* jscregexp = |
| 116 reinterpret_cast<jscre::JSRegExp*>(regex.GetDataStartAddress()); | 116 reinterpret_cast<jscre::JSRegExp*>(regex.GetDataStartAddress()); |
| 117 ASSERT(jscregexp != NULL); | 117 ASSERT(jscregexp != NULL); |
| 118 const Smi& num_bracket_exprs = Smi::Handle(regex.num_bracket_expressions()); | 118 const Smi& num_bracket_exprs = Smi::Handle(regex.num_bracket_expressions()); |
| 119 intptr_t num_bracket_expressions = num_bracket_exprs.Value(); | 119 intptr_t num_bracket_expressions = num_bracket_exprs.Value(); |
| 120 Zone* zone = Isolate::Current()->current_zone(); | 120 StackZone* zone = Isolate::Current()->current_zone(); |
| 121 // The jscre library rounds the passed in size to a multiple of 3 in order | 121 // The jscre library rounds the passed in size to a multiple of 3 in order |
| 122 // to reuse the passed in offsets array as a temporary chunk of working | 122 // to reuse the passed in offsets array as a temporary chunk of working |
| 123 // storage during matching, so we just pass in a size which is a multiple | 123 // storage during matching, so we just pass in a size which is a multiple |
| 124 // of 3. | 124 // of 3. |
| 125 const int kJscreMultiple = 3; | 125 const int kJscreMultiple = 3; |
| 126 int offsets_length = (num_bracket_expressions + 1) * kJscreMultiple; | 126 int offsets_length = (num_bracket_expressions + 1) * kJscreMultiple; |
| 127 int* offsets = NULL; | 127 int* offsets = NULL; |
| 128 offsets = zone->Alloc<int>(offsets_length); | 128 offsets = zone->Alloc<int>(offsets_length); |
| 129 int retval = jscre::jsRegExpExecute(jscregexp, | 129 int retval = jscre::jsRegExpExecute(jscregexp, |
| 130 two_byte_str, | 130 two_byte_str, |
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| 163 i += kMatchPair) { | 163 i += kMatchPair) { |
| 164 start = Smi::New(offsets[i]); | 164 start = Smi::New(offsets[i]); |
| 165 end = Smi::New(offsets[i + 1]); | 165 end = Smi::New(offsets[i + 1]); |
| 166 array.SetAt(i, start); | 166 array.SetAt(i, start); |
| 167 array.SetAt(i+1, end); | 167 array.SetAt(i+1, end); |
| 168 } | 168 } |
| 169 return array.raw(); | 169 return array.raw(); |
| 170 } | 170 } |
| 171 | 171 |
| 172 } // namespace dart | 172 } // namespace dart |
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