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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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32 #include "utils.h" | 32 #include "utils.h" |
33 #include "list.h" | 33 #include "list.h" |
34 #include "scanner-base.h" | 34 #include "scanner-base.h" |
35 #include "preparse-data.h" | 35 #include "preparse-data.h" |
36 #include "preparser.h" | 36 #include "preparser.h" |
37 | 37 |
38 namespace v8 { | 38 namespace v8 { |
39 namespace internal { | 39 namespace internal { |
40 | 40 |
41 // UTF16Buffer based on a v8::UnicodeInputStream. | 41 // UTF16Buffer based on a v8::UnicodeInputStream. |
42 class InputStreamUTF16Buffer : public UTF16Buffer { | 42 class InputStreamUTF16Buffer : public UC16CharacterStream { |
43 public: | 43 public: |
44 explicit InputStreamUTF16Buffer(UnicodeInputStream* stream) | 44 explicit InputStreamUTF16Buffer(UnicodeInputStream* stream) |
45 : UTF16Buffer(), | 45 : UC16CharacterStream(), |
46 stream_(stream) { } | 46 stream_(stream), |
47 pushback_active_(false) { | |
48 buffer_cursor_ = buffer_end_ = buffer_; | |
49 ReadBlock(); | |
50 } | |
47 | 51 |
48 virtual ~InputStreamUTF16Buffer() { } | 52 virtual ~InputStreamUTF16Buffer() { } |
49 | 53 |
50 virtual void PushBack(uc32 ch) { | 54 virtual void PushBack(uc16 ch) { |
55 if (buffer_cursor_ > buffer_) { | |
56 // While we can stay within the buffer, just do so. | |
57 buffer_cursor_--; | |
58 ASSERT_EQ(*buffer_cursor_, ch); | |
59 return; | |
60 } | |
Erik Corry
2010/12/07 12:27:30
Can the contents of this first if be put in a non-
Lasse Reichstein
2010/12/07 14:05:54
Pushback is a rare operation. I doubt there is any
| |
61 if (!pushback_active_) { | |
62 // Push back the entire buffer to the stream and let the | |
63 // stream handle pushbacks from now. | |
64 // We leave buffer_cursor_ == buffer_end_, so the next read | |
65 // will fill the buffer from the current position. | |
66 while (buffer_end_ > buffer_) { | |
67 stream_->PushBack(*--buffer_end_); | |
68 } | |
Erik Corry
2010/12/07 12:27:30
Do we need a PushBackBlock method? This looks slo
Lasse Reichstein
2010/12/07 14:05:54
The interface should be reconsidered. It might not
| |
69 pushback_active_ = true; | |
70 } | |
51 stream_->PushBack(ch); | 71 stream_->PushBack(ch); |
52 pos_--; | 72 pos_--; |
53 } | 73 } |
54 | 74 |
55 virtual uc32 Advance() { | 75 protected: |
56 uc32 result = stream_->Next(); | 76 virtual bool ReadBlock() { |
57 if (result >= 0) pos_++; | 77 pushback_active_ = false; |
58 return result; | 78 int32_t value; |
79 buffer_cursor_ = buffer_end_ = buffer_; | |
80 while ((value = stream_->Next()) >= 0) { | |
81 if (value > static_cast<int32_t>(unibrow::Utf8::kMaxThreeByteChar)) { | |
82 value = unibrow::Utf8::kBadChar; | |
83 } | |
84 // buffer_end_ is a const pointer, but buffer_ is writable. | |
85 buffer_[buffer_end_++ - buffer_] = static_cast<uc16>(value); | |
86 if (buffer_end_ == buffer_ + kBufferSize) break; | |
87 } | |
88 return buffer_end_ > buffer_; | |
59 } | 89 } |
60 | 90 |
61 virtual void SeekForward(int pos) { | 91 virtual unsigned SlowSeekForward(unsigned pos) { |
62 // Seeking in the input is not used by preparsing. | 92 // Seeking in the input is not used by preparsing. |
63 // It's only used by the real parser based on preparser data. | 93 // It's only used by the real parser based on preparser data. |
64 UNIMPLEMENTED(); | 94 UNIMPLEMENTED(); |
95 return 0; | |
65 } | 96 } |
66 | 97 |
67 private: | 98 private: |
99 static const unsigned kBufferSize = 512; | |
68 v8::UnicodeInputStream* const stream_; | 100 v8::UnicodeInputStream* const stream_; |
101 uc16 buffer_[kBufferSize]; | |
102 bool pushback_active_; | |
69 }; | 103 }; |
70 | 104 |
71 | 105 |
72 class StandAloneJavaScriptScanner : public JavaScriptScanner { | 106 class StandAloneJavaScriptScanner : public JavaScriptScanner { |
73 public: | 107 public: |
74 void Initialize(UTF16Buffer* source) { | 108 void Initialize(UC16CharacterStream* source) { |
75 source_ = source; | 109 source_ = source; |
76 literal_flags_ = kLiteralString | kLiteralIdentifier; | 110 literal_flags_ = kLiteralString | kLiteralIdentifier; |
77 Init(); | 111 Init(); |
78 // Skip initial whitespace allowing HTML comment ends just like | 112 // Skip initial whitespace allowing HTML comment ends just like |
79 // after a newline and scan first token. | 113 // after a newline and scan first token. |
80 has_line_terminator_before_next_ = true; | 114 has_line_terminator_before_next_ = true; |
81 SkipWhiteSpace(); | 115 SkipWhiteSpace(); |
82 Scan(); | 116 Scan(); |
83 } | 117 } |
84 }; | 118 }; |
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119 return PreParserData(size, data); | 153 return PreParserData(size, data); |
120 } | 154 } |
121 | 155 |
122 } // namespace v8. | 156 } // namespace v8. |
123 | 157 |
124 | 158 |
125 // Used by ASSERT macros and other immediate exits. | 159 // Used by ASSERT macros and other immediate exits. |
126 extern "C" void V8_Fatal(const char* file, int line, const char* format, ...) { | 160 extern "C" void V8_Fatal(const char* file, int line, const char* format, ...) { |
127 exit(EXIT_FAILURE); | 161 exit(EXIT_FAILURE); |
128 } | 162 } |
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