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      1 // Copyright 2011 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #include "break-iterator.h"
     29 
     30 #include "unicode/brkiter.h"
     31 #include "unicode/locid.h"
     32 #include "unicode/rbbi.h"
     33 
     34 namespace v8 {
     35 namespace internal {
     36 
     37 v8::Persistent<v8::FunctionTemplate> BreakIterator::break_iterator_template_;
     38 
     39 icu::BreakIterator* BreakIterator::UnpackBreakIterator(
     40     v8::Handle<v8::Object> obj) {
     41   if (break_iterator_template_->HasInstance(obj)) {
     42     return static_cast<icu::BreakIterator*>(
     43         obj->GetPointerFromInternalField(0));
     44   }
     45 
     46   return NULL;
     47 }
     48 
     49 icu::UnicodeString* BreakIterator::ResetAdoptedText(
     50     v8::Handle<v8::Object> obj, v8::Handle<v8::Value> value) {
     51   // Get the previous value from the internal field.
     52   icu::UnicodeString* text = static_cast<icu::UnicodeString*>(
     53       obj->GetPointerFromInternalField(1));
     54   delete text;
     55 
     56   // Assign new value to the internal pointer.
     57   v8::String::Value text_value(value);
     58   text = new icu::UnicodeString(
     59       reinterpret_cast<const UChar*>(*text_value), text_value.length());
     60   obj->SetPointerInInternalField(1, text);
     61 
     62   // Return new unicode string pointer.
     63   return text;
     64 }
     65 
     66 void BreakIterator::DeleteBreakIterator(v8::Persistent<v8::Value> object,
     67                                         void* param) {
     68   v8::Persistent<v8::Object> persistent_object =
     69       v8::Persistent<v8::Object>::Cast(object);
     70 
     71   // First delete the hidden C++ object.
     72   // Unpacking should never return NULL here. That would only happen if
     73   // this method is used as the weak callback for persistent handles not
     74   // pointing to a break iterator.
     75   delete UnpackBreakIterator(persistent_object);
     76 
     77   delete static_cast<icu::UnicodeString*>(
     78       persistent_object->GetPointerFromInternalField(1));
     79 
     80   // Then dispose of the persistent handle to JS object.
     81   persistent_object.Dispose();
     82 }
     83 
     84 // Throws a JavaScript exception.
     85 static v8::Handle<v8::Value> ThrowUnexpectedObjectError() {
     86   // Returns undefined, and schedules an exception to be thrown.
     87   return v8::ThrowException(v8::Exception::Error(
     88       v8::String::New("BreakIterator method called on an object "
     89                       "that is not a BreakIterator.")));
     90 }
     91 
     92 v8::Handle<v8::Value> BreakIterator::BreakIteratorAdoptText(
     93     const v8::Arguments& args) {
     94   if (args.Length() != 1 || !args[0]->IsString()) {
     95     return v8::ThrowException(v8::Exception::SyntaxError(
     96         v8::String::New("Text input is required.")));
     97   }
     98 
     99   icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
    100   if (!break_iterator) {
    101     return ThrowUnexpectedObjectError();
    102   }
    103 
    104   break_iterator->setText(*ResetAdoptedText(args.Holder(), args[0]));
    105 
    106   return v8::Undefined();
    107 }
    108 
    109 v8::Handle<v8::Value> BreakIterator::BreakIteratorFirst(
    110     const v8::Arguments& args) {
    111   icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
    112   if (!break_iterator) {
    113     return ThrowUnexpectedObjectError();
    114   }
    115 
    116   return v8::Int32::New(break_iterator->first());
    117 }
    118 
    119 v8::Handle<v8::Value> BreakIterator::BreakIteratorNext(
    120     const v8::Arguments& args) {
    121   icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
    122   if (!break_iterator) {
    123     return ThrowUnexpectedObjectError();
    124   }
    125 
    126   return v8::Int32::New(break_iterator->next());
    127 }
    128 
    129 v8::Handle<v8::Value> BreakIterator::BreakIteratorCurrent(
    130     const v8::Arguments& args) {
    131   icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
    132   if (!break_iterator) {
    133     return ThrowUnexpectedObjectError();
    134   }
    135 
    136   return v8::Int32::New(break_iterator->current());
    137 }
    138 
    139 v8::Handle<v8::Value> BreakIterator::BreakIteratorBreakType(
    140     const v8::Arguments& args) {
    141   icu::BreakIterator* break_iterator = UnpackBreakIterator(args.Holder());
    142   if (!break_iterator) {
    143     return ThrowUnexpectedObjectError();
    144   }
    145 
    146   // TODO(cira): Remove cast once ICU fixes base BreakIterator class.
    147   icu::RuleBasedBreakIterator* rule_based_iterator =
    148       static_cast<icu::RuleBasedBreakIterator*>(break_iterator);
    149   int32_t status = rule_based_iterator->getRuleStatus();
    150   // Keep return values in sync with JavaScript BreakType enum.
    151   if (status >= UBRK_WORD_NONE && status < UBRK_WORD_NONE_LIMIT) {
    152     return v8::Int32::New(UBRK_WORD_NONE);
    153   } else if (status >= UBRK_WORD_NUMBER && status < UBRK_WORD_NUMBER_LIMIT) {
    154     return v8::Int32::New(UBRK_WORD_NUMBER);
    155   } else if (status >= UBRK_WORD_LETTER && status < UBRK_WORD_LETTER_LIMIT) {
    156     return v8::Int32::New(UBRK_WORD_LETTER);
    157   } else if (status >= UBRK_WORD_KANA && status < UBRK_WORD_KANA_LIMIT) {
    158     return v8::Int32::New(UBRK_WORD_KANA);
    159   } else if (status >= UBRK_WORD_IDEO && status < UBRK_WORD_IDEO_LIMIT) {
    160     return v8::Int32::New(UBRK_WORD_IDEO);
    161   } else {
    162     return v8::Int32::New(-1);
    163   }
    164 }
    165 
    166 v8::Handle<v8::Value> BreakIterator::JSBreakIterator(
    167     const v8::Arguments& args) {
    168   v8::HandleScope handle_scope;
    169 
    170   if (args.Length() != 2 || !args[0]->IsString() || !args[1]->IsString()) {
    171     return v8::ThrowException(v8::Exception::SyntaxError(
    172         v8::String::New("Locale and iterator type are required.")));
    173   }
    174 
    175   v8::String::Utf8Value locale(args[0]);
    176   icu::Locale icu_locale(*locale);
    177 
    178   UErrorCode status = U_ZERO_ERROR;
    179   icu::BreakIterator* break_iterator = NULL;
    180   v8::String::Utf8Value type(args[1]);
    181   if (!strcmp(*type, "character")) {
    182     break_iterator =
    183         icu::BreakIterator::createCharacterInstance(icu_locale, status);
    184   } else if (!strcmp(*type, "word")) {
    185     break_iterator =
    186         icu::BreakIterator::createWordInstance(icu_locale, status);
    187   } else if (!strcmp(*type, "sentence")) {
    188     break_iterator =
    189         icu::BreakIterator::createSentenceInstance(icu_locale, status);
    190   } else if (!strcmp(*type, "line")) {
    191     break_iterator =
    192         icu::BreakIterator::createLineInstance(icu_locale, status);
    193   } else {
    194     return v8::ThrowException(v8::Exception::SyntaxError(
    195         v8::String::New("Invalid iterator type.")));
    196   }
    197 
    198   if (U_FAILURE(status)) {
    199     delete break_iterator;
    200     return v8::ThrowException(v8::Exception::Error(
    201         v8::String::New("Failed to create break iterator.")));
    202   }
    203 
    204   if (break_iterator_template_.IsEmpty()) {
    205     v8::Local<v8::FunctionTemplate> raw_template(v8::FunctionTemplate::New());
    206 
    207     raw_template->SetClassName(v8::String::New("v8Locale.v8BreakIterator"));
    208 
    209     // Define internal field count on instance template.
    210     v8::Local<v8::ObjectTemplate> object_template =
    211         raw_template->InstanceTemplate();
    212 
    213     // Set aside internal fields for icu break iterator and adopted text.
    214     object_template->SetInternalFieldCount(2);
    215 
    216     // Define all of the prototype methods on prototype template.
    217     v8::Local<v8::ObjectTemplate> proto = raw_template->PrototypeTemplate();
    218     proto->Set(v8::String::New("adoptText"),
    219                v8::FunctionTemplate::New(BreakIteratorAdoptText));
    220     proto->Set(v8::String::New("first"),
    221                v8::FunctionTemplate::New(BreakIteratorFirst));
    222     proto->Set(v8::String::New("next"),
    223                v8::FunctionTemplate::New(BreakIteratorNext));
    224     proto->Set(v8::String::New("current"),
    225                v8::FunctionTemplate::New(BreakIteratorCurrent));
    226     proto->Set(v8::String::New("breakType"),
    227                v8::FunctionTemplate::New(BreakIteratorBreakType));
    228 
    229     break_iterator_template_ =
    230         v8::Persistent<v8::FunctionTemplate>::New(raw_template);
    231   }
    232 
    233   // Create an empty object wrapper.
    234   v8::Local<v8::Object> local_object =
    235       break_iterator_template_->GetFunction()->NewInstance();
    236   v8::Persistent<v8::Object> wrapper =
    237       v8::Persistent<v8::Object>::New(local_object);
    238 
    239   // Set break iterator as internal field of the resulting JS object.
    240   wrapper->SetPointerInInternalField(0, break_iterator);
    241   // Make sure that the pointer to adopted text is NULL.
    242   wrapper->SetPointerInInternalField(1, NULL);
    243 
    244   // Make object handle weak so we can delete iterator once GC kicks in.
    245   wrapper.MakeWeak(NULL, DeleteBreakIterator);
    246 
    247   return wrapper;
    248 }
    249 
    250 } }  // namespace v8::internal
    251