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/*
* @file ejsInternal.h
* @brief Private header for Embedded Javascript (ECMAScript)
* @overview This Embedded Javascript header defines the private Embedded
* Javascript internal structures.
*/
/********************************* Copyright **********************************/
/*
* @copy default.g
*
* Copyright (c) Mbedthis Software LLC, 2003-2005. All Rights Reserved.
* Portions Copyright (c) GoAhead Software, 1995-2000. All Rights Reserved.
*
* This software is distributed under commercial and open source licenses.
* You may use the GPL open source license described below or you may acquire
* a commercial license from Mbedthis Software. You agree to be fully bound
* by the terms of either license. Consult the LICENSE.TXT distributed with
* this software for full details.
*
* This software is open source; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See the GNU General Public License for more
* details at: http://www.mbedthis.com/downloads/gplLicense.html
*
* This program is distributed WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* This GPL license does NOT permit incorporating this software into
* proprietary programs. If you are unable to comply with the GPL, you must
* acquire a commercial license to use this software. Commercial licenses
* for this software and support services are available from Mbedthis
* Software at http://www.mbedthis.com
*
* @end
*/
/********************************* Includes ***********************************/
#ifndef _h_EJS_INTERNAL
#define _h_EJS_INTERNAL 1
#include "ejs.h"
/********************************** Defines ***********************************/
#ifdef __cplusplus
extern "C" {
#endif
/*
* Constants
*/
#if BLD_FEATURE_SQUEEZE
#define EJS_PARSE_INCR 256 /* Growth factor */
#define EJS_MAX_RECURSE 25 /* Sanity for maximum recursion */
#define EJS_MAX_ID 128 /* Maximum ID length */
#define EJS_OBJ_HASH_SIZE 13 /* Object hash table size */
#define EJS_SMALL_OBJ_HASH_SIZE 11 /* Small object hash size */
#define EJS_LIST_INCR 8 /* Growth increment for lists */
#else
#define EJS_PARSE_INCR 1024 /* Growth factor */
#define EJS_MAX_RECURSE 100 /* Sanity for maximum recursion */
#define EJS_MAX_ID 256 /* Maximum ID length */
#define EJS_OBJ_HASH_SIZE 29 /* Object hash table size */
#define EJS_SMALL_OBJ_HASH_SIZE 11 /* Small object hash size */
#define EJS_LIST_INCR 16 /* Growth increment for lists */
#endif
#define EJS_TOKEN_STACK 4 /* Put back token stack */
/*
* Lexical analyser tokens
*/
#define EJS_TOK_ERR -1 /* Any error */
#define EJS_TOK_LPAREN 1 /* ( */
#define EJS_TOK_RPAREN 2 /* ) */
#define EJS_TOK_IF 3 /* if */
#define EJS_TOK_ELSE 4 /* else */
#define EJS_TOK_LBRACE 5 /* { */
#define EJS_TOK_RBRACE 6 /* } */
#define EJS_TOK_LOGICAL 7 /* ||, &&, ! */
#define EJS_TOK_EXPR 8 /* +, -, /, % */
#define EJS_TOK_SEMI 9 /* ; */
#define EJS_TOK_LITERAL 10 /* literal string */
#define EJS_TOK_FUNCTION_NAME 11 /* functionName */
#define EJS_TOK_NEWLINE 12 /* newline white space */
#define EJS_TOK_ID 13 /* Identifier */
#define EJS_TOK_EOF 14 /* End of script */
#define EJS_TOK_COMMA 15 /* Comma */
#define EJS_TOK_VAR 16 /* var */
#define EJS_TOK_ASSIGNMENT 17 /* = */
#define EJS_TOK_FOR 18 /* for */
#define EJS_TOK_INC_DEC 19 /* ++, -- */
#define EJS_TOK_RETURN 20 /* return */
#define EJS_TOK_PERIOD 21 /* . */
#define EJS_TOK_LBRACKET 22 /* [ */
#define EJS_TOK_RBRACKET 23 /* ] */
#define EJS_TOK_NEW 24 /* new */
#define EJS_TOK_DELETE 25 /* delete */
#define EJS_TOK_IN 26 /* in */
#define EJS_TOK_FUNCTION 27 /* function */
#define EJS_TOK_NUMBER 28 /* Number */
/*
* Expression operators
*/
#define EJS_EXPR_LESS 1 /* < */
#define EJS_EXPR_LESSEQ 2 /* <= */
#define EJS_EXPR_GREATER 3 /* > */
#define EJS_EXPR_GREATEREQ 4 /* >= */
#define EJS_EXPR_EQ 5 /* == */
#define EJS_EXPR_NOTEQ 6 /* != */
#define EJS_EXPR_PLUS 7 /* + */
#define EJS_EXPR_MINUS 8 /* - */
#define EJS_EXPR_DIV 9 /* / */
#define EJS_EXPR_MOD 10 /* % */
#define EJS_EXPR_LSHIFT 11 /* << */
#define EJS_EXPR_RSHIFT 12 /* >> */
#define EJS_EXPR_MUL 13 /* * */
#define EJS_EXPR_ASSIGNMENT 14 /* = */
#define EJS_EXPR_INC 15 /* ++ */
#define EJS_EXPR_DEC 16 /* -- */
#define EJS_EXPR_BOOL_COMP 17 /* ! */
/*
* Conditional operators
*/
#define EJS_COND_AND 1 /* && */
#define EJS_COND_OR 2 /* || */
#define EJS_COND_NOT 3 /* ! */
/*
* States
*/
#define EJS_STATE_ERR -1 /* Error state */
#define EJS_STATE_EOF 1 /* End of file */
#define EJS_STATE_COND 2 /* Parsing a "(conditional)" stmt */
#define EJS_STATE_COND_DONE 3
#define EJS_STATE_RELEXP 4 /* Parsing a relational expr */
#define EJS_STATE_RELEXP_DONE 5
#define EJS_STATE_EXPR 6 /* Parsing an expression */
#define EJS_STATE_EXPR_DONE 7
#define EJS_STATE_STMT 8 /* Parsing General statement */
#define EJS_STATE_STMT_DONE 9
#define EJS_STATE_STMT_BLOCK_DONE 10 /* End of block "}" */
#define EJS_STATE_ARG_LIST 11 /* Function arg list */
#define EJS_STATE_ARG_LIST_DONE 12
#define EJS_STATE_DEC_LIST 16 /* Declaration list */
#define EJS_STATE_DEC_LIST_DONE 17
#define EJS_STATE_DEC 18 /* Declaration statement */
#define EJS_STATE_DEC_DONE 19
#define EJS_STATE_RET 20 /* Return statement */
#define EJS_STATE_BEGIN EJS_STATE_STMT
/*
* General parsing flags.
*/
#define EJS_FLAGS_EXE 0x1 /* Execute statements */
#define EJS_FLAGS_LOCAL 0x2 /* Get local vars only */
#define EJS_FLAGS_GLOBAL 0x4 /* Get global vars only */
#define EJS_FLAGS_CREATE 0x8 /* Create var */
#define EJS_FLAGS_ASSIGNMENT 0x10 /* In assignment stmt */
#define EJS_FLAGS_DELETE 0x20 /* Deleting a variable */
#define EJS_FLAGS_FOREACH 0x40 /* In foreach */
#define EJS_FLAGS_NEW 0x80 /* In a new stmt() */
#define EJS_FLAGS_EXIT 0x100 /* Must exit */
/*
* Putback token
*/
typedef struct EjsToken {
char *token; /* Token string */
int id; /* Token ID */
} EjsToken;
/*
* EJ evaluation block structure
*/
typedef struct ejEval {
EjsToken putBack[EJS_TOKEN_STACK]; /* Put back token stack */
int putBackIndex; /* Top of stack index */
MprStr line; /* Current line */
int lineLength; /* Current line length */
int lineNumber; /* Parse line number */
int lineColumn; /* Column in line */
MprStr script; /* Input script for parsing */
char *scriptServp; /* Next token in the script */
int scriptSize; /* Length of script */
MprStr tokbuf; /* Current token */
char *tokEndp; /* Pointer past end of token */
char *tokServp; /* Pointer to next token char */
int tokSize; /* Size of token buffer */
struct ejEval *next; /* used for backtraces */
const char *procName; /* gives name in backtrace */
} EjsInput;
/*
* Function call structure
*/
typedef struct {
MprArray *args; /* Args for function */
MprVar *fn; /* Function definition */
char *procName; /* Function name */
} EjsProc;
/*
* Per EJS structure
*/
typedef struct ej {
EjsHandle altHandle; /* alternate callback handle */
MprVar *currentObj; /* Ptr to current object */
MprVar *currentProperty; /* Ptr to current property */
EjsId eid; /* Halloc handle */
char *error; /* Error message */
int exitStatus; /* Status to exit() */
int flags; /* Flags */
MprArray *frames; /* List of variable frames */
MprVar *global; /* Global object */
EjsInput *input; /* Input evaluation block */
MprVar *local; /* Local object */
EjsHandle primaryHandle; /* primary callback handle */
EjsProc *proc; /* Current function */
MprVar result; /* Variable result */
void *thisPtr; /* C++ ptr for functions */
int tid; /* Current token id */
char *token; /* Pointer to token string */
MprVar tokenNumber; /* Parsed number */
} Ejs;
typedef int EjsBlock; /* Scope block id */
/*
* Function callback when using Alternate handles.
*/
typedef int (*EjsAltStringCFunction)(EjsHandle userHandle, EjsHandle altHandle,
int argc, char **argv);
typedef int (*EjsAltCFunction)(EjsHandle userHandle, EjsHandle altHandle,
int argc, MprVar **argv);
/******************************** Prototypes **********************************/
/*
* Ejs Lex
*/
extern int ejsLexOpenScript(Ejs* ep, char *script);
extern void ejsLexCloseScript(Ejs* ep);
extern int ejsInitInputState(EjsInput *ip);
extern void ejsLexSaveInputState(Ejs* ep, EjsInput* state);
extern void ejsLexFreeInputState(Ejs* ep, EjsInput* state);
extern void ejsLexRestoreInputState(Ejs* ep, EjsInput* state);
extern int ejsLexGetToken(Ejs* ep, int state);
extern void ejsLexPutbackToken(Ejs* ep, int tid, char *string);
/*
* Parsing
*/
extern MprVar *ejsFindObj(Ejs *ep, int state, const char *property,
int flags);
extern MprVar *ejsFindProperty(Ejs *ep, int state, MprVar *obj,
char *property, int flags);
extern int ejsGetVarCore(Ejs *ep, const char *var, MprVar **obj,
MprVar **varValue, int flags);
extern int ejsParse(Ejs *ep, int state, int flags);
extern Ejs *ejsPtr(EjsId eid);
extern void ejsSetExitStatus(int eid, int status);
extern void ejsSetFlags(int orFlags, int andFlags);
/*
* Create variable scope blocks
*/
extern EjsBlock ejsOpenBlock(EjsId eid);
extern int ejsCloseBlock(EjsId eid, EjsBlock vid);
extern int ejsEvalBlock(EjsId eid, char *script, MprVar *v, char **err);
extern int ejsDefineStandardProperties(MprVar *objVar);
/*
* Error handling
*/
extern void ejsError(Ejs *ep, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
#ifdef __cplusplus
}
#endif
#endif /* _h_EJS_INTERNAL */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim:tw=78
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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