343 lines
12 KiB
C
343 lines
12 KiB
C
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/*
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js.h -- JavaScript header
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Copyright (c) All Rights Reserved. See details at the end of the file.
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*/
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#ifndef _h_JS
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#define _h_JS 1
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/********************************* Includes ***********************************/
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#include "goahead.h"
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#if ME_GOAHEAD_JAVASCRIPT
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/********************************** Defines ***********************************/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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Constants
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*/
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#define JS_INC 110 /* Growth for tags/tokens */
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#define JS_SCRIPT_INC 1023 /* Growth for ej scripts */
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#define JS_OFFSET 1 /* hAlloc doesn't like 0 entries */
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#define JS_MAX_RECURSE 100 /* Sanity for maximum recursion */
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/*
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Javascript Lexical analyser tokens
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*/
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#define TOK_ERR -1 /* Any error */
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#define TOK_LPAREN 1 /* ( */
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#define TOK_RPAREN 2 /* ) */
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#define TOK_IF 3 /* if */
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#define TOK_ELSE 4 /* else */
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#define TOK_LBRACE 5 /* { */
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#define TOK_RBRACE 6 /* } */
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#define TOK_LOGICAL 7 /* ||, &&, ! */
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#define TOK_EXPR 8 /* +, -, /, % */
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#define TOK_SEMI 9 /* ; */
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#define TOK_LITERAL 10 /* literal string */
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#define TOK_FUNCTION 11 /* function name */
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#define TOK_NEWLINE 12 /* newline white space */
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#define TOK_ID 13 /* function name */
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#define TOK_EOF 14 /* End of script */
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#define TOK_COMMA 15 /* Comma */
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#define TOK_VAR 16 /* var */
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#define TOK_ASSIGNMENT 17 /* = */
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#define TOK_FOR 18 /* for */
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#define TOK_INC_DEC 19 /* ++, -- */
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#define TOK_RETURN 20 /* return */
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/*
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Expression operators
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*/
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#define EXPR_LESS 1 /* < */
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#define EXPR_LESSEQ 2 /* <= */
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#define EXPR_GREATER 3 /* > */
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#define EXPR_GREATEREQ 4 /* >= */
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#define EXPR_EQ 5 /* == */
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#define EXPR_NOTEQ 6 /* != */
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#define EXPR_PLUS 7 /* + */
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#define EXPR_MINUS 8 /* - */
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#define EXPR_DIV 9 /* / */
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#define EXPR_MOD 10 /* % */
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#define EXPR_LSHIFT 11 /* << */
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#define EXPR_RSHIFT 12 /* >> */
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#define EXPR_MUL 13 /* * */
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#define EXPR_ASSIGNMENT 14 /* = */
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#define EXPR_INC 15 /* ++ */
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#define EXPR_DEC 16 /* -- */
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#define EXPR_BOOL_COMP 17 /* ! */
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/*
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Conditional operators
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*/
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#define COND_AND 1 /* && */
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#define COND_OR 2 /* || */
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#define COND_NOT 3 /* ! */
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/*
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States
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*/
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#define STATE_ERR -1 /* Error state */
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#define STATE_EOF 1 /* End of file */
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#define STATE_COND 2 /* Parsing a "(conditional)" stmt */
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#define STATE_COND_DONE 3
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#define STATE_RELEXP 4 /* Parsing a relational expr */
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#define STATE_RELEXP_DONE 5
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#define STATE_EXPR 6 /* Parsing an expression */
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#define STATE_EXPR_DONE 7
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#define STATE_STMT 8 /* Parsing General statement */
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#define STATE_STMT_DONE 9
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#define STATE_STMT_BLOCK_DONE 10 /* End of block "}" */
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#define STATE_ARG_LIST 11 /* Function arg list */
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#define STATE_ARG_LIST_DONE 12
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#define STATE_DEC_LIST 16 /* Declaration list */
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#define STATE_DEC_LIST_DONE 17
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#define STATE_DEC 18
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#define STATE_DEC_DONE 19
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#define STATE_RET 20 /* Return statement */
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#define STATE_BEGIN STATE_STMT
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/*
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Flags. Used in Js and as parameter to parse()
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*/
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#define FLAGS_EXE 0x1 /* Execute statements */
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#define FLAGS_VARIABLES 0x2 /* Allocated variables store */
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#define FLAGS_FUNCTIONS 0x4 /* Allocated function store */
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/*
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Function call structure
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*/
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typedef struct JsFun {
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char *fname; /* Function name */
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char **args; /* Args for function (halloc) */
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int nArgs; /* Number of args */
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} JsFun;
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/*
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Evaluation block structure
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*/
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typedef struct JsInput {
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WebsBuf tokbuf; /* Current token */
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WebsBuf script; /* Input script for parsing */
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char *putBackToken; /* Putback token string */
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int putBackTokenId; /* Putback token ID */
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char *line; /* Current line */
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int lineLength; /* Current line length */
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int lineNumber; /* Parse line number */
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int lineColumn; /* Column in line */
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} JsInput;
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/**
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Javascript engine structure
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@defgroup Js Js
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*/
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typedef struct Js {
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JsInput *input; /* Input evaluation block */
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WebsHash functions; /* Symbol table for functions */
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WebsHash *variables; /* hAlloc list of variables */
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int variableMax; /* Number of entries */
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JsFun *func; /* Current function */
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char *result; /* Current expression result */
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char *error; /* Error message */
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char *token; /* Pointer to token string */
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int tid; /* Current token id */
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int jid; /* Halloc handle */
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int flags; /* Flags */
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void *userHandle; /* User defined handle */
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} Js;
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/**
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Javascript function procedure
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@ingroup Js
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*/
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typedef int (*JsProc)(int jid, void *handle, int argc, char **argv);
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/******************************** Prototypes **********************************/
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/**
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Utility routine to parse function arguments
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@param argc Count of arguments in argv
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@param argv Array of arguments
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@param fmt Printf style format string
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@return Count of the arguments parsed
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@ingroup Js
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*/
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PUBLIC int jsArgs(int argc, char **argv, cchar *fmt, ...);
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/**
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Close a javascript engine
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@param jid Javascript ID allocated via jsOpenEngine
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@ingroup Js
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*/
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PUBLIC void jsCloseEngine(int jid);
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/**
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Emit a parse error
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@param js Javascript engine object
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@param fmt Error message format string
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@ingroup Js
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*/
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PUBLIC void jsError(Js *js, cchar *fmt, ...);
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/**
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Parse and evaluate a script. Return the last function return value.
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@param jid Javascript ID allocated via jsOpenEngine
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@param script Script to evaluate
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@param emsg Pointer to a string to receive any error message
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@param str String value to use as the result. Set to null for errors.
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@ingroup Js
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*/
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PUBLIC char *jsEval(int jid, cchar *script, char **emsg);
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/**
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Get the function result value
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@param jid Javascript ID allocated via jsOpenEngine
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@return Function return value string. Caller must not free.
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@ingroup Js
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*/
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PUBLIC cchar *jsGetResult(int jid);
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/**
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Get a variable value
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@param jid Javascript ID allocated via jsOpenEngine
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@param var Variable name
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@param value Returned value.
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@return If successful, a positive variable index, otherwise -1. This will be zero for global variables
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and > 0 for local variables.
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@ingroup Js
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*/
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PUBLIC int jsGetVar(int jid, cchar *var, cchar **value);
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/**
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Open a new javascript engine
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@param variables Hash table of variables
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@param functions Hash table of functions
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@ingroup Js
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*/
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PUBLIC int jsOpenEngine(WebsHash variables, WebsHash functions);
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/**
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Set a local variable
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@param jid Javascript ID allocated via jsOpenEngine
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@param var Variable name
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@param value Value to use
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@ingroup Js
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*/
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PUBLIC void jsSetLocalVar(int jid, cchar *var, cchar *value);
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/**
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Set a global variable
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@param jid Javascript ID allocated via jsOpenEngine
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@param var Variable name
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@param value value to use
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@ingroup Js
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*/
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PUBLIC void jsSetGlobalVar(int jid, cchar *var, cchar *value);
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/**
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Set the function return result
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@param jid Javascript ID allocated via jsOpenEngine
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@param str String value to use as the result
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@ingroup Js
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*/
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PUBLIC void jsSetResult(int jid, cchar *str);
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/**
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Set a variable value in the top most variable frame
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@param jid Javascript ID allocated via jsOpenEngine
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@param var Variable name
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@param value Value to set
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@ingroup Js
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*/
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PUBLIC void jsSetVar(int jid, cchar *var, cchar *value);
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/**
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Set a global function
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@param jid Javascript ID allocated via jsOpenEngine
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@param name Javascript function name
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@param fn C function providing the implementation.
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@ingroup Js
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*/
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PUBLIC int jsSetGlobalFunction(int jid, cchar *name, JsProc fn);
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/*
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Internal API
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*/
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PUBLIC int jsCloseBlock(int jid, int vid);
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PUBLIC char *jsEvalBlock(int jid, cchar *script, char **emsg);
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PUBLIC WebsHash jsGetFunctionTable(int jid);
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PUBLIC void *jsGetGlobalFunction(int jid, cchar *name);
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PUBLIC int jsGetLineNumber(int jid);
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PUBLIC void *jsGetUserHandle(int jid);
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PUBLIC WebsHash jsGetVariableTable(int jid);
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PUBLIC int jsLexOpen(Js *ep);
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PUBLIC void jsLexClose(Js *ep);
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PUBLIC int jsLexOpenScript(Js *ep, cchar *script);
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PUBLIC void jsLexCloseScript(Js *ep);
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PUBLIC void jsLexSaveInputState(Js *ep, JsInput *state);
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PUBLIC void jsLexFreeInputState(Js *ep, JsInput *state);
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PUBLIC void jsLexRestoreInputState(Js *ep, JsInput *state);
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PUBLIC int jsLexGetToken(Js *ep, int state);
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PUBLIC void jsLexPutbackToken(Js *ep, int tid, cchar *string);
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PUBLIC int jsOpenBlock(int jid);
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PUBLIC int jsRemoveGlobalFunction(int jid, cchar *name);
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PUBLIC int jsSetGlobalFunctionDirect(WebsHash functions, cchar *name, JsProc fn);
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PUBLIC void jsSetUserHandle(int jid, void *handle);
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#if ME_GOAHEAD_LEGACY
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typedef Js ej_t;
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typedef JsInput jsinput_t;
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typedef JsFun jsfunc_t;
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#define ejOpenBlock jsOpenBlock
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#define ejCloseBlock jsCloseBlock
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#define ejEvalBlock jsEvalBlock
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#define ejRemoveGlobalFunction jsRemoveGlobalFunction
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#define ejGetGlobalFunction jsGetGlobalFunction
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#define ejSetGlobalFunctionDirect jsSetGlobalFunctionDirect
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#define ejError jsError
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#define ejSetUserHandle jsSetUserHandle
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#define ejGetUserHandle jsGetUserHandle
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#define ejGetLineNumber jsGetLineNumber
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#define ejGetResult jsGetResult
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#define ejSetLocalVar jsSetLocalVar
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#define ejSetGlobalVar jsSetGlobalVar
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#define ejLexOpen jsLexOpen
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#define ejLexClose jsLexClose
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#define ejLexOpenScript jsLexOpenScript
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#define ejLexCloseScript jsLexCloseScript
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#define ejLexSaveInputState jsLexSaveInputState
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#define ejLexFreeInputState jsLexFreeInputState
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#define ejLexRestoreInputState jsLexRestoreInputState
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#define ejLexGetToken jsLexGetToken
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#define ejLexPutbackToken jsLexPutbackToken
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#define ejGetVariableTable jsGetVariableTable
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#define ejGetFunctionTable jsGetFunctionTable
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#define ejArgs jsArgs
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#define ejSetResult jsSetResult
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#define ejOpenEngine jsOpenEngine
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#define ejCloseEngine jsCloseEngine
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#define ejSetGlobalFunction jsSetGlobalFunction
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#define ejSetVar jsSetVar
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#define ejGetVar jsGetVar
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#define ejEval jsEval
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* ME_GOAHEAD_JAVASCRIPT */
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#endif /* _h_JS */
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/*
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Copyright (c) Embedthis Software. All Rights Reserved.
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This software is distributed under commercial and open source licenses.
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You may use the Embedthis GoAhead open source license or you may acquire
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a commercial license from Embedthis Software. You agree to be fully bound
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by the terms of either license. Consult the LICENSE.md distributed with
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this software for full details and other copyrights.
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*/
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