1 | /* |
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2 | * ej.h -- Ejscript(TM) header |
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3 | * |
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4 | * Copyright (c) Go Ahead Software, Inc., 1992-1999 |
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5 | * |
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6 | * See the file "license.txt" for information on usage and redistribution |
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7 | */ |
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8 | |
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9 | #ifndef _h_EJ |
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10 | #define _h_EJ 1 |
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11 | |
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12 | /******************************** Description *********************************/ |
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13 | |
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14 | /* |
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15 | * Go Ahead Ejscript(TM) header. This defines the Ejscript API and internal |
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16 | * structures. |
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17 | */ |
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18 | |
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19 | /********************************* Includes ***********************************/ |
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20 | |
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21 | #include <ctype.h> |
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22 | #include <stdarg.h> |
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23 | #include <stdlib.h> |
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24 | #ifndef CE |
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25 | #include <fcntl.h> |
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26 | #endif |
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27 | |
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28 | #if LYNX |
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29 | #include <unistd.h> |
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30 | #endif |
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31 | |
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32 | #ifdef QNX4 |
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33 | #include <dirent.h> |
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34 | #endif |
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35 | |
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36 | #if UEMF |
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37 | #include "uemf.h" |
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38 | #else |
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39 | #include <param.h> |
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40 | #include <stat.h> |
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41 | #include "basic/basicInternal.h" |
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42 | #include "emf/emf.h" |
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43 | #include "webs/webs.h" |
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44 | #endif |
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45 | |
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46 | /********************************** Defines ***********************************/ |
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47 | /* |
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48 | * Constants |
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49 | */ |
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50 | #define EJ_INC 110 /* Growth for tags/tokens */ |
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51 | #define EJ_OFFSET 1 /* hAlloc doesn't like 0 entries */ |
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52 | #define EJ_MAX_RECURSE 100 /* Sanity for maximum recursion */ |
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53 | |
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54 | /* |
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55 | * Ejscript Lexical analyser tokens |
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56 | */ |
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57 | #define TOK_ERR -1 /* Any error */ |
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58 | #define TOK_LPAREN 1 /* ( */ |
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59 | #define TOK_RPAREN 2 /* ) */ |
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60 | #define TOK_IF 3 /* if */ |
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61 | #define TOK_ELSE 4 /* else */ |
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62 | #define TOK_LBRACE 5 /* { */ |
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63 | #define TOK_RBRACE 6 /* } */ |
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64 | #define TOK_LOGICAL 7 /* ||, &&, ! */ |
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65 | #define TOK_EXPR 8 /* +, -, /, % */ |
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66 | #define TOK_SEMI 9 /* ; */ |
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67 | #define TOK_LITERAL 10 /* literal string */ |
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68 | #define TOK_FUNCTION 11 /* function name */ |
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69 | #define TOK_NEWLINE 12 /* newline white space */ |
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70 | #define TOK_ID 13 /* function name */ |
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71 | #define TOK_EOF 14 /* End of script */ |
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72 | #define TOK_COMMA 15 /* Comma */ |
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73 | #define TOK_VAR 16 /* var */ |
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74 | #define TOK_ASSIGNMENT 17 /* = */ |
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75 | #define TOK_FOR 18 /* for */ |
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76 | #define TOK_INC_DEC 19 /* ++, -- */ |
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77 | #define TOK_RETURN 20 /* return */ |
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78 | |
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79 | /* |
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80 | * Expression operators |
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81 | */ |
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82 | #define EXPR_LESS 1 /* < */ |
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83 | #define EXPR_LESSEQ 2 /* <= */ |
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84 | #define EXPR_GREATER 3 /* > */ |
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85 | #define EXPR_GREATEREQ 4 /* >= */ |
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86 | #define EXPR_EQ 5 /* == */ |
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87 | #define EXPR_NOTEQ 6 /* != */ |
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88 | #define EXPR_PLUS 7 /* + */ |
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89 | #define EXPR_MINUS 8 /* - */ |
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90 | #define EXPR_DIV 9 /* / */ |
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91 | #define EXPR_MOD 10 /* % */ |
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92 | #define EXPR_LSHIFT 11 /* << */ |
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93 | #define EXPR_RSHIFT 12 /* >> */ |
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94 | #define EXPR_MUL 13 /* * */ |
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95 | #define EXPR_ASSIGNMENT 14 /* = */ |
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96 | #define EXPR_INC 15 /* ++ */ |
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97 | #define EXPR_DEC 16 /* -- */ |
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98 | |
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99 | /* |
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100 | * Conditional operators |
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101 | */ |
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102 | #define COND_AND 1 /* && */ |
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103 | #define COND_OR 2 /* || */ |
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104 | #define COND_NOT 3 /* ! */ |
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105 | |
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106 | /* |
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107 | * States |
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108 | */ |
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109 | #define STATE_ERR -1 /* Error state */ |
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110 | #define STATE_EOF 1 /* End of file */ |
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111 | #define STATE_COND 2 /* Parsing a "(conditional)" stmt */ |
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112 | #define STATE_COND_DONE 3 |
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113 | #define STATE_RELEXP 4 /* Parsing a relational expr */ |
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114 | #define STATE_RELEXP_DONE 5 |
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115 | #define STATE_EXPR 6 /* Parsing an expression */ |
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116 | #define STATE_EXPR_DONE 7 |
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117 | #define STATE_STMT 8 /* Parsing General statement */ |
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118 | #define STATE_STMT_DONE 9 |
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119 | #define STATE_STMT_BLOCK_DONE 10 /* End of block "}" */ |
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120 | #define STATE_ARG_LIST 11 /* Function arg list */ |
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121 | #define STATE_ARG_LIST_DONE 12 |
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122 | #define STATE_DEC_LIST 16 /* Declaration list */ |
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123 | #define STATE_DEC_LIST_DONE 17 |
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124 | #define STATE_DEC 18 |
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125 | #define STATE_DEC_DONE 19 |
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126 | #define STATE_BEGIN STATE_STMT |
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127 | |
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128 | /* |
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129 | * Flags. Used in ej_t and as parameter to parse() |
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130 | */ |
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131 | #define FLAGS_EXE 0x1 /* Execute statements */ |
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132 | #define FLAGS_VARIABLES 0x2 /* Allocated variables store */ |
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133 | #define FLAGS_FUNCTIONS 0x4 /* Allocated function store */ |
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134 | |
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135 | /* |
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136 | * Function call structure |
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137 | */ |
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138 | typedef struct { |
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139 | char_t *fname; /* Function name */ |
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140 | char_t **args; /* Args for function (halloc) */ |
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141 | int nArgs; /* Number of args */ |
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142 | } ejfunc_t; |
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143 | |
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144 | /* |
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145 | * EJ evaluation block structure |
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146 | */ |
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147 | typedef struct ejEval { |
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148 | ringq_t tokbuf; /* Current token */ |
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149 | ringq_t script; /* Input script for parsing */ |
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150 | char_t *putBackToken; /* Putback token string */ |
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151 | int putBackTokenId; /* Putback token ID */ |
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152 | char_t *line; /* Current line */ |
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153 | int lineLength; /* Current line length */ |
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154 | int lineNumber; /* Parse line number */ |
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155 | int lineColumn; /* Column in line */ |
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156 | } ejinput_t; |
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157 | |
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158 | /* |
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159 | * Per Ejscript session structure |
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160 | */ |
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161 | typedef struct ej { |
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162 | ejinput_t *input; /* Input evaluation block */ |
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163 | sym_fd_t functions; /* Symbol table for functions */ |
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164 | sym_fd_t *variables; /* hAlloc list of variables */ |
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165 | int variableMax; /* Number of entries */ |
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166 | ejfunc_t *func; /* Current function */ |
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167 | char_t *result; /* Current expression result */ |
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168 | char_t *error; /* Error message */ |
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169 | char_t *token; /* Pointer to token string */ |
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170 | int tid; /* Current token id */ |
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171 | int eid; /* Halloc handle */ |
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172 | int flags; /* Flags */ |
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173 | int userHandle; /* User defined handle */ |
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174 | } ej_t; |
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175 | |
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176 | /******************************** Prototypes **********************************/ |
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177 | |
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178 | extern int ejOpenEngine(sym_fd_t variables, sym_fd_t functions); |
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179 | extern void ejCloseEngine(int eid); |
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180 | extern int ejOpenBlock(int eid); |
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181 | extern int ejCloseBlock(int eid, int vid); |
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182 | extern char_t *ejEval(int eid, char_t *script, char_t **emsg); |
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183 | extern char_t *ejEvalBlock(int eid, char_t *script, char_t **emsg); |
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184 | extern char_t *ejEvalFile(int eid, char_t *path, char_t **emsg); |
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185 | extern int ejSetGlobalFunction(int eid, char_t *name, |
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186 | int (*fn)(int eid, void *handle, int argc, char_t **argv)); |
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187 | extern void *ejGetGlobalFunction(int eid, char_t *name); |
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188 | extern int ejSetGlobalFunctionDirect(sym_fd_t functions, char_t *name, |
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189 | int (*fn)(int eid, void *handle, int argc, char_t **argv)); |
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190 | extern int ejArgs(int argc, char_t **argv, char_t *fmt, ...); |
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191 | extern void ejError(ej_t* ep, char_t* fmt, ...); |
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192 | extern void ejSetUserHandle(int eid, int handle); |
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193 | extern int ejGetUserHandle(int eid); |
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194 | extern int ejGetLineNumber(int eid); |
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195 | extern void ejSetResult(int eid, char_t *s); |
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196 | extern char_t *ejGetResult(int eid); |
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197 | extern void ejSetVar(int eid, char_t *var, char_t *value); |
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198 | extern void ejSetLocalVar(int eid, char_t *var, char_t *value); |
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199 | extern int ejGetVar(int eid, char_t *var, char_t **value); |
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200 | extern void ejSetGlobalVar(int eid, char_t *var, char_t *value); |
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201 | |
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202 | extern int ejLexOpen(ej_t* ep); |
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203 | extern void ejLexClose(ej_t* ep); |
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204 | extern int ejLexOpenScript(ej_t* ep, char_t *script); |
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205 | extern void ejLexCloseScript(ej_t* ep); |
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206 | extern void ejLexSaveInputState(ej_t* ep, ejinput_t* state); |
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207 | extern void ejLexFreeInputState(ej_t* ep, ejinput_t* state); |
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208 | extern void ejLexRestoreInputState(ej_t* ep, ejinput_t* state); |
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209 | extern int ejLexGetToken(ej_t* ep, int state); |
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210 | extern void ejLexPutbackToken(ej_t* ep, int tid, char_t *string); |
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211 | |
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212 | extern sym_fd_t ejGetVariableTable(int eid); |
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213 | extern sym_fd_t ejGetFunctionTable(int eid); |
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214 | |
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215 | extern int ejEmfOpen(int eid); |
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216 | extern void ejEmfClose(int eid); |
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217 | |
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218 | extern int ejEmfDbRead(int eid, void *handle, int argc, char_t **argv); |
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219 | extern int ejEmfDbReadKeyed(int eid, void *handle, int argc, char_t **argv); |
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220 | extern int ejEmfDbTableGetNrow(int eid, void *handle, int argc, char_t **argv); |
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221 | extern int ejEmfTrace(int eid, void *handle, int argc, char_t **argv); |
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222 | extern int ejEmfDbWrite(int eid, void *handle, int argc, char_t **argv); |
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223 | |
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224 | #endif /* _h_EJ */ |
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225 | |
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226 | /*****************************************************************************/ |
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