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/*
* ej.h -- Ejscript(TM) header
*
* Copyright (c) Go Ahead Software, Inc., 1992-1999
*
* See the file "license.txt" for information on usage and redistribution
*/
#ifndef _h_EJ
#define _h_EJ 1
/******************************** Description *********************************/
/*
* Go Ahead Ejscript(TM) header. This defines the Ejscript API and internal
* structures.
*/
/********************************* Includes ***********************************/
#include <ctype.h>
#include <stdarg.h>
#include <stdlib.h>
#ifndef CE
#include <fcntl.h>
#endif
#if LYNX
#include <unistd.h>
#endif
#ifdef QNX4
#include <dirent.h>
#endif
#if UEMF
#include "uemf.h"
#else
#include <param.h>
#include <stat.h>
#include "basic/basicInternal.h"
#include "emf/emf.h"
#include "webs/webs.h"
#endif
/********************************** Defines ***********************************/
/*
* Constants
*/
#define EJ_INC 110 /* Growth for tags/tokens */
#define EJ_OFFSET 1 /* hAlloc doesn't like 0 entries */
#define EJ_MAX_RECURSE 100 /* Sanity for maximum recursion */
/*
* Ejscript Lexical analyser tokens
*/
#define TOK_ERR -1 /* Any error */
#define TOK_LPAREN 1 /* ( */
#define TOK_RPAREN 2 /* ) */
#define TOK_IF 3 /* if */
#define TOK_ELSE 4 /* else */
#define TOK_LBRACE 5 /* { */
#define TOK_RBRACE 6 /* } */
#define TOK_LOGICAL 7 /* ||, &&, ! */
#define TOK_EXPR 8 /* +, -, /, % */
#define TOK_SEMI 9 /* ; */
#define TOK_LITERAL 10 /* literal string */
#define TOK_FUNCTION 11 /* function name */
#define TOK_NEWLINE 12 /* newline white space */
#define TOK_ID 13 /* function name */
#define TOK_EOF 14 /* End of script */
#define TOK_COMMA 15 /* Comma */
#define TOK_VAR 16 /* var */
#define TOK_ASSIGNMENT 17 /* = */
#define TOK_FOR 18 /* for */
#define TOK_INC_DEC 19 /* ++, -- */
#define TOK_RETURN 20 /* return */
/*
* Expression operators
*/
#define EXPR_LESS 1 /* < */
#define EXPR_LESSEQ 2 /* <= */
#define EXPR_GREATER 3 /* > */
#define EXPR_GREATEREQ 4 /* >= */
#define EXPR_EQ 5 /* == */
#define EXPR_NOTEQ 6 /* != */
#define EXPR_PLUS 7 /* + */
#define EXPR_MINUS 8 /* - */
#define EXPR_DIV 9 /* / */
#define EXPR_MOD 10 /* % */
#define EXPR_LSHIFT 11 /* << */
#define EXPR_RSHIFT 12 /* >> */
#define EXPR_MUL 13 /* * */
#define EXPR_ASSIGNMENT 14 /* = */
#define EXPR_INC 15 /* ++ */
#define EXPR_DEC 16 /* -- */
/*
* Conditional operators
*/
#define COND_AND 1 /* && */
#define COND_OR 2 /* || */
#define COND_NOT 3 /* ! */
/*
* States
*/
#define STATE_ERR -1 /* Error state */
#define STATE_EOF 1 /* End of file */
#define STATE_COND 2 /* Parsing a "(conditional)" stmt */
#define STATE_COND_DONE 3
#define STATE_RELEXP 4 /* Parsing a relational expr */
#define STATE_RELEXP_DONE 5
#define STATE_EXPR 6 /* Parsing an expression */
#define STATE_EXPR_DONE 7
#define STATE_STMT 8 /* Parsing General statement */
#define STATE_STMT_DONE 9
#define STATE_STMT_BLOCK_DONE 10 /* End of block "}" */
#define STATE_ARG_LIST 11 /* Function arg list */
#define STATE_ARG_LIST_DONE 12
#define STATE_DEC_LIST 16 /* Declaration list */
#define STATE_DEC_LIST_DONE 17
#define STATE_DEC 18
#define STATE_DEC_DONE 19
#define STATE_BEGIN STATE_STMT
/*
* Flags. Used in ej_t and as parameter to parse()
*/
#define FLAGS_EXE 0x1 /* Execute statements */
#define FLAGS_VARIABLES 0x2 /* Allocated variables store */
#define FLAGS_FUNCTIONS 0x4 /* Allocated function store */
/*
* Function call structure
*/
typedef struct {
char_t *fname; /* Function name */
char_t **args; /* Args for function (halloc) */
int nArgs; /* Number of args */
} ejfunc_t;
/*
* EJ evaluation block structure
*/
typedef struct ejEval {
ringq_t tokbuf; /* Current token */
ringq_t script; /* Input script for parsing */
char_t *putBackToken; /* Putback token string */
int putBackTokenId; /* Putback token ID */
char_t *line; /* Current line */
int lineLength; /* Current line length */
int lineNumber; /* Parse line number */
int lineColumn; /* Column in line */
} ejinput_t;
/*
* Per Ejscript session structure
*/
typedef struct ej {
ejinput_t *input; /* Input evaluation block */
sym_fd_t functions; /* Symbol table for functions */
sym_fd_t *variables; /* hAlloc list of variables */
int variableMax; /* Number of entries */
ejfunc_t *func; /* Current function */
char_t *result; /* Current expression result */
char_t *error; /* Error message */
char_t *token; /* Pointer to token string */
int tid; /* Current token id */
int eid; /* Halloc handle */
int flags; /* Flags */
int userHandle; /* User defined handle */
} ej_t;
/******************************** Prototypes **********************************/
extern int ejOpenEngine(sym_fd_t variables, sym_fd_t functions);
extern void ejCloseEngine(int eid);
extern int ejOpenBlock(int eid);
extern int ejCloseBlock(int eid, int vid);
extern char_t *ejEval(int eid, char_t *script, char_t **emsg);
extern char_t *ejEvalBlock(int eid, char_t *script, char_t **emsg);
extern char_t *ejEvalFile(int eid, char_t *path, char_t **emsg);
extern int ejSetGlobalFunction(int eid, char_t *name,
int (*fn)(int eid, void *handle, int argc, char_t **argv));
extern void *ejGetGlobalFunction(int eid, char_t *name);
extern int ejSetGlobalFunctionDirect(sym_fd_t functions, char_t *name,
int (*fn)(int eid, void *handle, int argc, char_t **argv));
extern int ejArgs(int argc, char_t **argv, char_t *fmt, ...);
extern void ejError(ej_t* ep, char_t* fmt, ...);
extern void ejSetUserHandle(int eid, int handle);
extern int ejGetUserHandle(int eid);
extern int ejGetLineNumber(int eid);
extern void ejSetResult(int eid, char_t *s);
extern char_t *ejGetResult(int eid);
extern void ejSetVar(int eid, char_t *var, char_t *value);
extern void ejSetLocalVar(int eid, char_t *var, char_t *value);
extern int ejGetVar(int eid, char_t *var, char_t **value);
extern void ejSetGlobalVar(int eid, char_t *var, char_t *value);
extern int ejLexOpen(ej_t* ep);
extern void ejLexClose(ej_t* ep);
extern int ejLexOpenScript(ej_t* ep, char_t *script);
extern void ejLexCloseScript(ej_t* ep);
extern void ejLexSaveInputState(ej_t* ep, ejinput_t* state);
extern void ejLexFreeInputState(ej_t* ep, ejinput_t* state);
extern void ejLexRestoreInputState(ej_t* ep, ejinput_t* state);
extern int ejLexGetToken(ej_t* ep, int state);
extern void ejLexPutbackToken(ej_t* ep, int tid, char_t *string);
extern sym_fd_t ejGetVariableTable(int eid);
extern sym_fd_t ejGetFunctionTable(int eid);
extern int ejEmfOpen(int eid);
extern void ejEmfClose(int eid);
extern int ejEmfDbRead(int eid, void *handle, int argc, char_t **argv);
extern int ejEmfDbReadKeyed(int eid, void *handle, int argc, char_t **argv);
extern int ejEmfDbTableGetNrow(int eid, void *handle, int argc, char_t **argv);
extern int ejEmfTrace(int eid, void *handle, int argc, char_t **argv);
extern int ejEmfDbWrite(int eid, void *handle, int argc, char_t **argv);
#endif /* _h_EJ */
/*****************************************************************************/
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