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/*
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* ejIntrn.h -- Ejscript(TM) header
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*
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* Copyright (c) GoAhead Software, Inc., 1992-2000
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*
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* See the file "license.txt" for information on usage and redistribution
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*/
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#ifndef _h_EJINTERNAL
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#define _h_EJINTERNAL 1
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/******************************** Description *********************************/
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/*
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* GoAhead Ejscript(TM) header. This defines the Ejscript API and internal
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* structures.
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*/
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/********************************* Includes ***********************************/
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#if CE
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#if ! UEMF
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#include <io.h>
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#endif
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#endif
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#if LYNX
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#include <unistd.h>
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#endif
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#ifdef QNX4
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#include <dirent.h>
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#endif
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#if UEMF
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#include "uemf.h"
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#else
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#include <param.h>
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#include <stat.h>
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#include "basic/basicInternal.h"
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#include "emf/emfInternal.h"
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#endif
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#include "ej.h"
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/********************************** Defines ***********************************/
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/*
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* Constants
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*/
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#define EJ_INC 110 /* Growth for tags/tokens */
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#define EJ_SCRIPT_INC 1023 /* Growth for ej scripts */
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#define EJ_OFFSET 1 /* hAlloc doesn't like 0 entries */
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#define EJ_MAX_RECURSE 100 /* Sanity for maximum recursion */
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/*
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* Ejscript 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 ej_t 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 {
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char_t *fname; /* Function name */
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char_t **args; /* Args for function (halloc) */
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int nArgs; /* Number of args */
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} ejfunc_t;
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/*
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* EJ evaluation block structure
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*/
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typedef struct ejEval {
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ringq_t tokbuf; /* Current token */
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ringq_t script; /* Input script for parsing */
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char_t *putBackToken; /* Putback token string */
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int putBackTokenId; /* Putback token ID */
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char_t *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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} ejinput_t;
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/*
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* Per Ejscript session structure
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*/
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typedef struct ej {
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ejinput_t *input; /* Input evaluation block */
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sym_fd_t functions; /* Symbol table for functions */
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sym_fd_t *variables; /* hAlloc list of variables */
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int variableMax; /* Number of entries */
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ejfunc_t *func; /* Current function */
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char_t *result; /* Current expression result */
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char_t *error; /* Error message */
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char_t *token; /* Pointer to token string */
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int tid; /* Current token id */
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int eid; /* Halloc handle */
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int flags; /* Flags */
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int userHandle; /* User defined handle */
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} ej_t;
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/******************************** Prototypes **********************************/
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extern int ejOpenBlock(int eid);
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extern int ejCloseBlock(int eid, int vid);
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extern char_t *ejEvalBlock(int eid, char_t *script, char_t **emsg);
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#ifndef __NO_EJ_FILE
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extern char_t *ejEvalFile(int eid, char_t *path, char_t **emsg);
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#endif
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extern int ejRemoveGlobalFunction(int eid, char_t *name);
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extern void *ejGetGlobalFunction(int eid, char_t *name);
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extern int ejSetGlobalFunctionDirect(sym_fd_t functions, char_t *name,
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int (*fn)(int eid, void *handle, int argc, char_t **argv));
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extern void ejError(ej_t* ep, char_t* fmt, ...);
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extern void ejSetUserHandle(int eid, int handle);
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extern int ejGetUserHandle(int eid);
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extern int ejGetLineNumber(int eid);
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extern char_t *ejGetResult(int eid);
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extern void ejSetLocalVar(int eid, char_t *var, char_t *value);
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extern void ejSetGlobalVar(int eid, char_t *var, char_t *value);
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extern int ejLexOpen(ej_t* ep);
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extern void ejLexClose(ej_t* ep);
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extern int ejLexOpenScript(ej_t* ep, char_t *script);
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extern void ejLexCloseScript(ej_t* ep);
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extern void ejLexSaveInputState(ej_t* ep, ejinput_t* state);
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extern void ejLexFreeInputState(ej_t* ep, ejinput_t* state);
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extern void ejLexRestoreInputState(ej_t* ep, ejinput_t* state);
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extern int ejLexGetToken(ej_t* ep, int state);
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extern void ejLexPutbackToken(ej_t* ep, int tid, char_t *string);
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extern sym_fd_t ejGetVariableTable(int eid);
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extern sym_fd_t ejGetFunctionTable(int eid);
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extern int ejEmfOpen(int eid);
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extern void ejEmfClose(int eid);
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extern int ejEmfDbRead(int eid, void *handle, int argc, char_t **argv);
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extern int ejEmfDbReadKeyed(int eid, void *handle, int argc, char_t **argv);
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extern int ejEmfDbTableGetNrow(int eid, void *handle, int argc, char_t **argv);
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extern int ejEmfDbDeleteRow(int eid, void *handle, int argc, char_t **argv);
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extern int ejEmfTrace(int eid, void *handle, int argc, char_t **argv);
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extern int ejEmfDbWrite(int eid, void *handle, int argc, char_t **argv);
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extern int ejEmfDbCollectTable(int eid, void *handle, int argc, char_t **argv);
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#endif /* _h_EJINTERNAL */
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