зеркало из https://github.com/mozilla/pjs.git
262 строки
11 KiB
C
262 строки
11 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.0 (the "NPL"); you may not use this file except in
|
|
* compliance with the NPL. You may obtain a copy of the NPL at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the NPL is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
|
|
* for the specific language governing rights and limitations under the
|
|
* NPL.
|
|
*
|
|
* The Initial Developer of this code under the NPL is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
|
|
* Reserved.
|
|
*/
|
|
|
|
#ifndef jsscan_h___
|
|
#define jsscan_h___
|
|
/*
|
|
* JS lexical scanner interface.
|
|
*/
|
|
#include <stddef.h>
|
|
#ifdef JSFILE
|
|
#include <stdio.h>
|
|
#endif
|
|
#include "jsopcode.h"
|
|
#include "jsprvtd.h"
|
|
#include "jspubtd.h"
|
|
|
|
#ifdef JSD_LOWLEVEL_SOURCE
|
|
#include "jsdebug.h"
|
|
#endif
|
|
|
|
PR_BEGIN_EXTERN_C
|
|
|
|
typedef enum JSTokenType {
|
|
TOK_ERROR = -1, /* well-known as the only code < EOF */
|
|
TOK_EOF = 0, /* end of file */
|
|
TOK_EOL = 1, /* end of line */
|
|
TOK_SEMI = 2, /* semicolon */
|
|
TOK_LB = 3, TOK_RB = 4, /* left and right brackets */
|
|
TOK_LC = 5, TOK_RC = 6, /* left and right curlies (braces) */
|
|
TOK_LP = 7, TOK_RP = 8, /* left and right parentheses */
|
|
TOK_COMMA = 9, /* comma operator */
|
|
TOK_ASSIGN = 10, /* assignment ops (= += -= etc.) */
|
|
TOK_HOOK = 11, TOK_COLON = 12, /* conditional (?:) */
|
|
TOK_OR = 13, /* logical or (||) */
|
|
TOK_AND = 14, /* logical and (&&) */
|
|
TOK_BITOR = 15, /* bitwise-or (|) */
|
|
TOK_BITXOR = 16, /* bitwise-xor (^) */
|
|
TOK_BITAND = 17, /* bitwise-and (&) */
|
|
TOK_EQOP = 18, /* equality ops (== !=) */
|
|
TOK_RELOP = 19, /* relational ops (< <= > >=) */
|
|
TOK_SHOP = 20, /* shift ops (<< >> >>>) */
|
|
TOK_PLUS = 21, /* plus */
|
|
TOK_MINUS = 22, /* minus */
|
|
TOK_STAR = 23, TOK_DIVOP = 24, /* multiply/divide ops (* / %) */
|
|
TOK_UNARYOP = 25, /* unary prefix operator */
|
|
TOK_INC = 26, TOK_DEC = 27, /* increment/decrement (++ --) */
|
|
TOK_DOT = 28, /* member operator (.) */
|
|
TOK_NAME = 29, /* identifier */
|
|
TOK_NUMBER = 30, /* numeric constant */
|
|
TOK_STRING = 31, /* string constant */
|
|
TOK_OBJECT = 32, /* RegExp or other object constant */
|
|
TOK_PRIMARY = 33, /* true, false, null, this, super */
|
|
TOK_FUNCTION = 34, /* function keyword */
|
|
TOK_EXPORT = 35, /* export keyword */
|
|
TOK_IMPORT = 36, /* import keyword */
|
|
TOK_IF = 37, /* if keyword */
|
|
TOK_ELSE = 38, /* else keyword */
|
|
TOK_SWITCH = 39, /* switch keyword */
|
|
TOK_CASE = 40, /* case keyword */
|
|
TOK_DEFAULT = 41, /* default keyword */
|
|
TOK_WHILE = 42, /* while keyword */
|
|
TOK_DO = 43, /* do keyword */
|
|
TOK_FOR = 44, /* for keyword */
|
|
TOK_BREAK = 45, /* break keyword */
|
|
TOK_CONTINUE = 46, /* continue keyword */
|
|
TOK_IN = 47, /* in keyword */
|
|
TOK_VAR = 48, /* var keyword */
|
|
TOK_WITH = 49, /* with keyword */
|
|
TOK_RETURN = 50, /* return keyword */
|
|
TOK_NEW = 51, /* new keyword */
|
|
TOK_DELETE = 52, /* delete keyword */
|
|
TOK_DEFSHARP = 53, /* #n= for object/array initializers */
|
|
TOK_USESHARP = 54, /* #n# for object/array initializers */
|
|
TOK_TRY = 55, /* try keyword */
|
|
TOK_CATCH = 56, /* catch keyword */
|
|
TOK_FINALLY = 57, /* finally keyword */
|
|
TOK_THROW = 58, /* throw keyword */
|
|
TOK_INSTANCEOF = 59, /* instanceof keyword */
|
|
TOK_DEBUGGER = 60, /* debugger keyword */
|
|
TOK_RESERVED, /* reserved keywords */
|
|
TOK_LIMIT /* domain size */
|
|
} JSTokenType;
|
|
|
|
#define IS_PRIMARY_TOKEN(tt) \
|
|
((uintN)((tt) - TOK_NAME) <= (uintN)(TOK_PRIMARY - TOK_NAME))
|
|
|
|
struct JSTokenPtr {
|
|
uint16 index; /* index of char in physical line */
|
|
uint16 lineno; /* physical line number */
|
|
};
|
|
|
|
struct JSTokenPos {
|
|
JSTokenPtr begin; /* first character and line of token */
|
|
JSTokenPtr end; /* index 1 past last char, last line */
|
|
};
|
|
|
|
struct JSToken {
|
|
JSTokenType type; /* char value or above enumerator */
|
|
JSTokenPos pos; /* token position in file */
|
|
jschar *ptr; /* beginning of token in line buffer */
|
|
union {
|
|
struct {
|
|
JSOp op; /* operator, for minimal parser */
|
|
JSAtom *atom; /* atom table entry */
|
|
} s;
|
|
jsdouble dval; /* floating point number */
|
|
} u;
|
|
};
|
|
|
|
#define t_op u.s.op
|
|
#define t_atom u.s.atom
|
|
#define t_dval u.dval
|
|
|
|
typedef struct JSTokenBuf {
|
|
jschar *base; /* base of line or stream buffer */
|
|
jschar *limit; /* limit for quick bounds check */
|
|
jschar *ptr; /* next char to get, or slot to use */
|
|
} JSTokenBuf;
|
|
|
|
#define JS_LINE_LIMIT 256 /* logical line buffer size limit --
|
|
physical line length is unlimited */
|
|
|
|
struct JSTokenStream {
|
|
JSToken token; /* last token scanned */
|
|
JSToken pushback; /* pushed-back already-scanned token */
|
|
uintN lineno; /* current line number */
|
|
uintN ungetpos; /* next free char slot in ungetbuf */
|
|
jschar ungetbuf[4]; /* at most 4, for \uXXXX lookahead */
|
|
uintN flags; /* flags -- see below */
|
|
ptrdiff_t linelen; /* physical linebuf segment length */
|
|
ptrdiff_t linepos; /* linebuf offset in physical line */
|
|
JSTokenBuf linebuf; /* line buffer for diagnostics */
|
|
JSTokenBuf userbuf; /* user input buffer if !file */
|
|
JSTokenBuf tokenbuf; /* current token string buffer */
|
|
const char *filename; /* input filename or null */
|
|
#ifdef JSFILE
|
|
FILE *file; /* stdio stream if reading from file */
|
|
#endif
|
|
JSPrincipals *principals; /* principals associated with given input */
|
|
#ifdef JSD_LOWLEVEL_SOURCE
|
|
JSDContext *jsdc; /* used to cram source into debugger */
|
|
JSDSourceText *jsdsrc; /* used to cram source into debugger */
|
|
#endif
|
|
};
|
|
|
|
/* JSTokenStream flags */
|
|
#define TSF_ERROR 0x01 /* fatal error while scanning */
|
|
#define TSF_EOF 0x02 /* hit end of file */
|
|
#define TSF_NEWLINES 0x04 /* tokenize newlines */
|
|
#define TSF_REGEXP 0x08 /* looking for a regular expression */
|
|
#define TSF_INTERACTIVE 0x10 /* interactive parsing mode */
|
|
#define TSF_NLFLAG 0x20 /* last linebuf ended with \n */
|
|
#define TSF_CRFLAG 0x40 /* linebuf would have ended with \r */
|
|
|
|
/*
|
|
* At most one non-EOF token can be pushed back onto a TokenStream between
|
|
* Get or successful Match operations. These macros manipulate the pushback
|
|
* token to clear it when changing scanning modes (upon initialzation, after
|
|
* errors, or between newline-sensitive and insensitive states).
|
|
*/
|
|
#define CLEAR_PUSHBACK(ts) ((ts)->pushback.type = TOK_EOF)
|
|
#define SCAN_NEWLINES(ts) ((ts)->flags |= TSF_NEWLINES)
|
|
#define HIDE_NEWLINES(ts) \
|
|
PR_BEGIN_MACRO \
|
|
(ts)->flags &= ~TSF_NEWLINES; \
|
|
if ((ts)->pushback.type == TOK_EOL) \
|
|
(ts)->pushback.type = TOK_EOF; \
|
|
PR_END_MACRO
|
|
|
|
/* Clear ts member that might point above a released cx->tempPool mark. */
|
|
#define RESET_TOKENBUF(ts) ((ts)->tokenbuf.base = (ts)->tokenbuf.limit = NULL)
|
|
|
|
/*
|
|
* Create a new token stream, either from an input buffer or from a file.
|
|
* Return null on file-open or memory-allocation failure.
|
|
*
|
|
* NB: All of js_New{,Buffer,File}TokenStream() return a pointer to transient
|
|
* memory in the current context's temp pool. This memory is deallocated via
|
|
* PR_ARENA_RELEASE() after parsing is finished.
|
|
*/
|
|
extern JSTokenStream *
|
|
js_NewTokenStream(JSContext *cx, const jschar *base, size_t length,
|
|
const char *filename, uintN lineno, JSPrincipals *principals);
|
|
|
|
extern JS_FRIEND_API(JSTokenStream *)
|
|
js_NewBufferTokenStream(JSContext *cx, const jschar *base, size_t length);
|
|
|
|
#ifdef JSFILE
|
|
extern JS_FRIEND_API(JSTokenStream *)
|
|
js_NewFileTokenStream(JSContext *cx, const char *filename, FILE *defaultfp);
|
|
#endif
|
|
|
|
extern JS_FRIEND_API(JSBool)
|
|
js_CloseTokenStream(JSContext *cx, JSTokenStream *ts);
|
|
|
|
/*
|
|
* Initialize the scanner, installing JS keywords into cx's global scope.
|
|
*/
|
|
extern JSBool
|
|
js_InitScanner(JSContext *cx);
|
|
|
|
/*
|
|
* Friend-exported API entry point to call a mapping function on each reserved
|
|
* identifier in the scanner's keyword table.
|
|
*/
|
|
extern JS_FRIEND_API(void)
|
|
js_MapKeywords(void (*mapfun)(const char *));
|
|
|
|
/*
|
|
* Report an error found while scanning ts to a window or other output device
|
|
* associated with cx.
|
|
*/
|
|
extern void
|
|
js_ReportCompileError(JSContext *cx, JSTokenStream *ts, const char *format,
|
|
...);
|
|
|
|
/*
|
|
* Look ahead one token and return its type.
|
|
*/
|
|
extern JSTokenType
|
|
js_PeekToken(JSContext *cx, JSTokenStream *ts);
|
|
|
|
extern JSTokenType
|
|
js_PeekTokenSameLine(JSContext *cx, JSTokenStream *ts);
|
|
|
|
/*
|
|
* Get the next token from ts.
|
|
*/
|
|
extern JSTokenType
|
|
js_GetToken(JSContext *cx, JSTokenStream *ts);
|
|
|
|
/*
|
|
* Push back the last scanned token onto ts.
|
|
*/
|
|
extern void
|
|
js_UngetToken(JSTokenStream *ts);
|
|
|
|
/*
|
|
* Get the next token from ts if its type is tt.
|
|
*/
|
|
extern JSBool
|
|
js_MatchToken(JSContext *cx, JSTokenStream *ts, JSTokenType tt);
|
|
|
|
PR_END_EXTERN_C
|
|
|
|
#endif /* jsscan_h___ */
|