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Diffstat (limited to 'src/dom/js/jsscan.h')
| -rw-r--r-- | src/dom/js/jsscan.h | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/src/dom/js/jsscan.h b/src/dom/js/jsscan.h new file mode 100644 index 000000000..c61eff926 --- /dev/null +++ b/src/dom/js/jsscan.h @@ -0,0 +1,264 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- + * + * ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Mozilla Communicator client code, released + * March 31, 1998. + * + * The Initial Developer of the Original Code is + * Netscape Communications Corporation. + * Portions created by the Initial Developer are Copyright (C) 1998 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either of the GNU General Public License Version 2 or later (the "GPL"), + * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +#ifndef jsscan_h___ +#define jsscan_h___ +/* + * JS lexical scanner interface. + */ +#include <stddef.h> +#include <stdio.h> +#include "jsopcode.h" +#include "jsprvtd.h" +#include "jspubtd.h" + +JS_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_COMMA = 3, /* comma operator */ + TOK_ASSIGN = 4, /* assignment ops (= += -= etc.) */ + TOK_HOOK = 5, TOK_COLON = 6, /* conditional (?:) */ + TOK_OR = 7, /* logical or (||) */ + TOK_AND = 8, /* logical and (&&) */ + TOK_BITOR = 9, /* bitwise-or (|) */ + TOK_BITXOR = 10, /* bitwise-xor (^) */ + TOK_BITAND = 11, /* bitwise-and (&) */ + TOK_EQOP = 12, /* equality ops (== !=) */ + TOK_RELOP = 13, /* relational ops (< <= > >=) */ + TOK_SHOP = 14, /* shift ops (<< >> >>>) */ + TOK_PLUS = 15, /* plus */ + TOK_MINUS = 16, /* minus */ + TOK_STAR = 17, TOK_DIVOP = 18, /* multiply/divide ops (* / %) */ + TOK_UNARYOP = 19, /* unary prefix operator */ + TOK_INC = 20, TOK_DEC = 21, /* increment/decrement (++ --) */ + TOK_DOT = 22, /* member operator (.) */ + TOK_LB = 23, TOK_RB = 24, /* left and right brackets */ + TOK_LC = 25, TOK_RC = 26, /* left and right curlies (braces) */ + TOK_LP = 27, TOK_RP = 28, /* left and right parentheses */ + 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 */ +#define NTOKENS 4 /* 1 current + 2 lookahead, rounded */ +#define NTOKENS_MASK (NTOKENS-1) /* to power of 2 to avoid divmod by 3 */ + +struct JSTokenStream { + JSToken tokens[NTOKENS];/* circular token buffer */ + uintN cursor; /* index of last parsed token */ + uintN lookahead; /* count of lookahead tokens */ + uintN lineno; /* current line number */ + uintN ungetpos; /* next free char slot in ungetbuf */ + jschar ungetbuf[6]; /* at most 6, 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 */ + FILE *file; /* stdio stream if reading from file */ + JSPrincipals *principals; /* principals associated with source */ + JSSourceHandler listener; /* callback for source; eg debugger */ + void *listenerData; /* listener 'this' data */ + void *listenerTSData;/* listener data for this TokenStream */ +}; + +#define CURRENT_TOKEN(ts) ((ts)->tokens[(ts)->cursor]) +#define ON_CURRENT_LINE(ts,pos) ((uint16)(ts)->lineno == (pos).end.lineno) + +/* JSTokenStream flags */ +#define TSF_ERROR 0x01 /* fatal error while compiling */ +#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_NLFLAG 0x20 /* last linebuf ended with \n */ +#define TSF_CRFLAG 0x40 /* linebuf would have ended with \r */ +#define TSF_DIRTYLINE 0x80 /* stuff other than whitespace since start of line */ + +/* Unicode separators that are treated as line terminators, in addition to \n, \r */ +#define LINE_SEPARATOR 0x2028 +#define PARA_SEPARATOR 0x2029 + +/* + * 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 + * JS_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); + +extern JS_FRIEND_API(JSTokenStream *) +js_NewFileTokenStream(JSContext *cx, const char *filename, FILE *defaultfp); + +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 a compile-time error by its number, using ts or cg to show context. + * Return true for a warning, false for an error. + */ +extern JSBool +js_ReportCompileErrorNumber(JSContext *cx, JSTokenStream *ts, + JSCodeGenerator *cg, uintN flags, + const uintN errorNumber, ...); + +/* + * 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); + +JS_END_EXTERN_C + +#endif /* jsscan_h___ */ |