#ifndef LiteralParser_h
#define LiteralParser_h
#include "JSGlobalObjectFunctions.h"
#include "JSValue.h"
#include "UString.h"
namespace JSC {
class LiteralParser {
public:
typedef enum { StrictJSON, NonStrictJSON } ParserMode;
LiteralParser(ExecState* exec, const UString& s, ParserMode mode)
: m_exec(exec)
, m_lexer(s, mode)
, m_mode(mode)
{
}
JSValue tryLiteralParse()
{
m_lexer.next();
JSValue result = parse(m_mode == StrictJSON ? StartParseExpression : StartParseStatement);
if (m_lexer.currentToken().type != TokEnd)
return JSValue();
return result;
}
private:
enum ParserState { StartParseObject, StartParseArray, StartParseExpression,
StartParseStatement, StartParseStatementEndStatement,
DoParseObjectStartExpression, DoParseObjectEndExpression,
DoParseArrayStartExpression, DoParseArrayEndExpression };
enum TokenType { TokLBracket, TokRBracket, TokLBrace, TokRBrace,
TokString, TokIdentifier, TokNumber, TokColon,
TokLParen, TokRParen, TokComma, TokTrue, TokFalse,
TokNull, TokEnd, TokError };
class Lexer {
public:
struct LiteralParserToken {
TokenType type;
const UChar* start;
const UChar* end;
UString stringToken;
double numberToken;
};
Lexer(const UString& s, ParserMode mode)
: m_string(s)
, m_mode(mode)
, m_ptr(s.data())
, m_end(s.data() + s.size())
{
}
TokenType next()
{
return lex(m_currentToken);
}
const LiteralParserToken& currentToken()
{
return m_currentToken;
}
private:
TokenType lex(LiteralParserToken&);
template <ParserMode mode> TokenType lexString(LiteralParserToken&);
TokenType lexNumber(LiteralParserToken&);
LiteralParserToken m_currentToken;
UString m_string;
ParserMode m_mode;
const UChar* m_ptr;
const UChar* m_end;
};
class StackGuard;
JSValue parse(ParserState);
ExecState* m_exec;
LiteralParser::Lexer m_lexer;
ParserMode m_mode;
};
}
#endif