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Made scanner follow coding style.

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Review URL: http://codereview.chromium.org/2832018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4916 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
lrn@chromium.org 2010-06-22 12:31:24 +00:00
parent 7287aff403
commit 05fa888927
2 changed files with 62 additions and 54 deletions
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3
src/scanner.cc
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@ -200,6 +200,7 @@ void ExternalStringUTF16Buffer<StringType, CharType>::SeekForward(int pos) {
// ----------------------------------------------------------------------------
// Keyword Matcher
KeywordMatcher::FirstState KeywordMatcher::first_states_[] = {
{ "break", KEYWORD_PREFIX, Token::BREAK },
{ NULL, C, Token::ILLEGAL },
@ -335,7 +336,7 @@ void KeywordMatcher::Step(uc32 input) {
// Scanner
Scanner::Scanner(ParserMode pre)
: stack_overflow_(false), is_pre_parsing_(pre == PREPARSE) { }
: is_pre_parsing_(pre == PREPARSE), stack_overflow_(false) { }
void Scanner::Initialize(Handle<String> source,

113
src/scanner.h
View File

@ -154,7 +154,12 @@ class KeywordMatcher {
// *: Actually "future reserved keywords". These are the only ones we
// recognized, the remaining are allowed as identifiers.
public:
KeywordMatcher() : state_(INITIAL), token_(Token::IDENTIFIER) {}
KeywordMatcher()
: state_(INITIAL),
token_(Token::IDENTIFIER),
keyword_(NULL),
counter_(0),
keyword_token_(Token::ILLEGAL) {}
Token::Value token() { return token_; }
@ -206,17 +211,6 @@ class KeywordMatcher {
// State map for first keyword character range.
static FirstState first_states_[kFirstCharRangeLength];
// Current state.
State state_;
// Token for currently added characters.
Token::Value token_;
// Matching a specific keyword string (there is only one possible valid
// keyword with the current prefix).
const char* keyword_;
int counter_;
Token::Value keyword_token_;
// If input equals keyword's character at position, continue matching keyword
// from that position.
inline bool MatchKeywordStart(uc32 input,
@ -246,15 +240,26 @@ class KeywordMatcher {
char match,
State new_state,
Token::Value keyword_token) {
if (input == match) { // Matched "do".
state_ = new_state;
token_ = keyword_token;
return true;
if (input != match) {
return false;
}
return false;
state_ = new_state;
token_ = keyword_token;
return true;
}
void Step(uc32 input);
// Current state.
State state_;
// Token for currently added characters.
Token::Value token_;
// Matching a specific keyword string (there is only one possible valid
// keyword with the current prefix).
const char* keyword_;
int counter_;
Token::Value keyword_token_;
};
@ -362,37 +367,6 @@ class Scanner {
static const int kNoEndPosition = 1;
private:
void Init(Handle<String> source,
unibrow::CharacterStream* stream,
int start_position, int end_position,
ParserLanguage language);
// Different UTF16 buffers used to pull characters from. Based on input one of
// these will be initialized as the actual data source.
CharacterStreamUTF16Buffer char_stream_buffer_;
ExternalStringUTF16Buffer<ExternalTwoByteString, uint16_t>
two_byte_string_buffer_;
ExternalStringUTF16Buffer<ExternalAsciiString, char> ascii_string_buffer_;
// Source. Will point to one of the buffers declared above.
UTF16Buffer* source_;
// Used to convert the source string into a character stream when a stream
// is not passed to the scanner.
SafeStringInputBuffer safe_string_input_buffer_;
// Buffer to hold literal values (identifiers, strings, numbers)
// using 0-terminated UTF-8 encoding.
UTF8Buffer literal_buffer_1_;
UTF8Buffer literal_buffer_2_;
bool stack_overflow_;
static StaticResource<Utf8Decoder> utf8_decoder_;
// One Unicode character look-ahead; c0_ < 0 at the end of the input.
uc32 c0_;
// The current and look-ahead token.
struct TokenDesc {
Token::Value token;
@ -400,11 +374,10 @@ class Scanner {
UTF8Buffer* literal_buffer;
};
TokenDesc current_; // desc for current token (as returned by Next())
TokenDesc next_; // desc for next token (one token look-ahead)
bool has_line_terminator_before_next_;
bool is_pre_parsing_;
bool is_parsing_json_;
void Init(Handle<String> source,
unibrow::CharacterStream* stream,
int start_position, int end_position,
ParserLanguage language);
// Literal buffer support
void StartLiteral();
@ -426,6 +399,7 @@ class Scanner {
return SkipJavaScriptWhiteSpace();
}
}
bool SkipJavaScriptWhiteSpace();
bool SkipJsonWhiteSpace();
Token::Value SkipSingleLineComment();
@ -460,11 +434,13 @@ class Scanner {
// the integer part is zero), and may include an exponent part (e.g., "e-10").
// Hexadecimal and octal numbers are not allowed.
Token::Value ScanJsonNumber();
// A JSON string (production JSONString) is subset of valid JavaScript string
// literals. The string must only be double-quoted (not single-quoted), and
// the only allowed backslash-escapes are ", /, \, b, f, n, r, t and
// four-digit hex escapes (uXXXX). Any other use of backslashes is invalid.
Token::Value ScanJsonString();
// Used to recognizes one of the literals "true", "false", or "null". These
// are the only valid JSON identifiers (productions JSONBooleanLiteral,
// JSONNullLiteral).
@ -489,6 +465,37 @@ class Scanner {
// Decodes a unicode escape-sequence which is part of an identifier.
// If the escape sequence cannot be decoded the result is kBadRune.
uc32 ScanIdentifierUnicodeEscape();
TokenDesc current_; // desc for current token (as returned by Next())
TokenDesc next_; // desc for next token (one token look-ahead)
bool has_line_terminator_before_next_;
bool is_pre_parsing_;
bool is_parsing_json_;
// Different UTF16 buffers used to pull characters from. Based on input one of
// these will be initialized as the actual data source.
CharacterStreamUTF16Buffer char_stream_buffer_;
ExternalStringUTF16Buffer<ExternalTwoByteString, uint16_t>
two_byte_string_buffer_;
ExternalStringUTF16Buffer<ExternalAsciiString, char> ascii_string_buffer_;
// Source. Will point to one of the buffers declared above.
UTF16Buffer* source_;
// Used to convert the source string into a character stream when a stream
// is not passed to the scanner.
SafeStringInputBuffer safe_string_input_buffer_;
// Buffer to hold literal values (identifiers, strings, numbers)
// using 0-terminated UTF-8 encoding.
UTF8Buffer literal_buffer_1_;
UTF8Buffer literal_buffer_2_;
bool stack_overflow_;
static StaticResource<Utf8Decoder> utf8_decoder_;
// One Unicode character look-ahead; c0_ < 0 at the end of the input.
uc32 c0_;
};
} } // namespace v8::internal