1 | /*
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2 | ** mirb - Embeddable Interactive Ruby Shell
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3 | **
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4 | ** This program takes code from the user in
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5 | ** an interactive way and executes it
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6 | ** immediately. It's a REPL...
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7 | */
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8 |
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9 | #include <stdlib.h>
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10 | #include <string.h>
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11 | #include <stdio.h>
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12 | #include <ctype.h>
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13 |
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14 | #include <signal.h>
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15 | #include <setjmp.h>
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16 |
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17 | #ifdef ENABLE_READLINE
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18 | #include <readline/readline.h>
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19 | #include <readline/history.h>
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20 | #define MIRB_ADD_HISTORY(line) add_history(line)
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21 | #define MIRB_READLINE(ch) readline(ch)
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22 | #define MIRB_WRITE_HISTORY(path) write_history(path)
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23 | #define MIRB_READ_HISTORY(path) read_history(path)
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24 | #define MIRB_USING_HISTORY() using_history()
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25 | #elif defined(ENABLE_LINENOISE)
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26 | #define ENABLE_READLINE
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27 | #include <linenoise.h>
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28 | #define MIRB_ADD_HISTORY(line) linenoiseHistoryAdd(line)
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29 | #define MIRB_READLINE(ch) linenoise(ch)
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30 | #define MIRB_WRITE_HISTORY(path) linenoiseHistorySave(path)
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31 | #define MIRB_READ_HISTORY(path) linenoiseHistoryLoad(history_path)
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32 | #define MIRB_USING_HISTORY()
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33 | #endif
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34 |
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35 | #ifndef _WIN32
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36 | #define MIRB_SIGSETJMP(env) sigsetjmp(env, 1)
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37 | #define MIRB_SIGLONGJMP(env, val) siglongjmp(env, val)
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38 | #define SIGJMP_BUF sigjmp_buf
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39 | #else
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40 | #define MIRB_SIGSETJMP(env) setjmp(env)
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41 | #define MIRB_SIGLONGJMP(env, val) longjmp(env, val)
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42 | #define SIGJMP_BUF jmp_buf
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43 | #endif
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44 |
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45 | #include <mruby.h>
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46 | #include <mruby/array.h>
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47 | #include <mruby/proc.h>
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48 | #include <mruby/compile.h>
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49 | #include <mruby/string.h>
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50 |
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51 | #ifdef ENABLE_READLINE
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52 |
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53 | static const char history_file_name[] = ".mirb_history";
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54 |
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55 | static char *
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56 | get_history_path(mrb_state *mrb)
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57 | {
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58 | char *path = NULL;
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59 | const char *home = getenv("HOME");
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60 |
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61 | #ifdef _WIN32
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62 | if (home != NULL) {
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63 | home = getenv("USERPROFILE");
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64 | }
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65 | #endif
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66 |
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67 | if (home != NULL) {
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68 | int len = snprintf(NULL, 0, "%s/%s", home, history_file_name);
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69 | if (len >= 0) {
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70 | size_t size = len + 1;
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71 | path = (char *)mrb_malloc_simple(mrb, size);
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72 | if (path != NULL) {
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73 | int n = snprintf(path, size, "%s/%s", home, history_file_name);
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74 | if (n != len) {
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75 | mrb_free(mrb, path);
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76 | path = NULL;
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77 | }
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78 | }
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79 | }
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80 | }
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81 |
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82 | return path;
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83 | }
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84 |
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85 | #endif
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86 |
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87 | static void
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88 | p(mrb_state *mrb, mrb_value obj, int prompt)
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89 | {
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90 | mrb_value val;
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91 |
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92 | val = mrb_funcall(mrb, obj, "inspect", 0);
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93 | if (prompt) {
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94 | if (!mrb->exc) {
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95 | fputs(" => ", stdout);
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96 | }
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97 | else {
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98 | val = mrb_funcall(mrb, mrb_obj_value(mrb->exc), "inspect", 0);
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99 | }
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100 | }
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101 | if (!mrb_string_p(val)) {
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102 | val = mrb_obj_as_string(mrb, obj);
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103 | }
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104 | fwrite(RSTRING_PTR(val), RSTRING_LEN(val), 1, stdout);
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105 | putc('\n', stdout);
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106 | }
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107 |
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108 | /* Guess if the user might want to enter more
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109 | * or if he wants an evaluation of his code now */
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110 | static mrb_bool
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111 | is_code_block_open(struct mrb_parser_state *parser)
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112 | {
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113 | mrb_bool code_block_open = FALSE;
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114 |
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115 | /* check for heredoc */
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116 | if (parser->parsing_heredoc != NULL) return TRUE;
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117 | if (parser->heredoc_end_now) {
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118 | parser->heredoc_end_now = FALSE;
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119 | return FALSE;
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120 | }
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121 |
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122 | /* check for unterminated string */
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123 | if (parser->lex_strterm) return TRUE;
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124 |
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125 | /* check if parser error are available */
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126 | if (0 < parser->nerr) {
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127 | const char unexpected_end[] = "syntax error, unexpected $end";
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128 | const char *message = parser->error_buffer[0].message;
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129 |
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130 | /* a parser error occur, we have to check if */
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131 | /* we need to read one more line or if there is */
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132 | /* a different issue which we have to show to */
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133 | /* the user */
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134 |
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135 | if (strncmp(message, unexpected_end, sizeof(unexpected_end) - 1) == 0) {
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136 | code_block_open = TRUE;
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137 | }
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138 | else if (strcmp(message, "syntax error, unexpected keyword_end") == 0) {
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139 | code_block_open = FALSE;
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140 | }
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141 | else if (strcmp(message, "syntax error, unexpected tREGEXP_BEG") == 0) {
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142 | code_block_open = FALSE;
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143 | }
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144 | return code_block_open;
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145 | }
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146 |
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147 | switch (parser->lstate) {
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148 |
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149 | /* all states which need more code */
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150 |
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151 | case EXPR_BEG:
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152 | /* beginning of a statement, */
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153 | /* that means previous line ended */
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154 | code_block_open = FALSE;
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155 | break;
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156 | case EXPR_DOT:
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157 | /* a message dot was the last token, */
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158 | /* there has to come more */
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159 | code_block_open = TRUE;
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160 | break;
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161 | case EXPR_CLASS:
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162 | /* a class keyword is not enough! */
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163 | /* we need also a name of the class */
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164 | code_block_open = TRUE;
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165 | break;
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166 | case EXPR_FNAME:
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167 | /* a method name is necessary */
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168 | code_block_open = TRUE;
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169 | break;
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170 | case EXPR_VALUE:
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171 | /* if, elsif, etc. without condition */
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172 | code_block_open = TRUE;
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173 | break;
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174 |
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175 | /* now all the states which are closed */
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176 |
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177 | case EXPR_ARG:
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178 | /* an argument is the last token */
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179 | code_block_open = FALSE;
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180 | break;
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181 |
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182 | /* all states which are unsure */
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183 |
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184 | case EXPR_CMDARG:
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185 | break;
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186 | case EXPR_END:
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187 | /* an expression was ended */
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188 | break;
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189 | case EXPR_ENDARG:
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190 | /* closing parenthese */
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191 | break;
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192 | case EXPR_ENDFN:
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193 | /* definition end */
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194 | break;
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195 | case EXPR_MID:
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196 | /* jump keyword like break, return, ... */
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197 | break;
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198 | case EXPR_MAX_STATE:
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199 | /* don't know what to do with this token */
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200 | break;
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201 | default:
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202 | /* this state is unexpected! */
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203 | break;
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204 | }
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205 |
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206 | return code_block_open;
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207 | }
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208 |
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209 | struct _args {
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210 | FILE *rfp;
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211 | mrb_bool verbose : 1;
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212 | int argc;
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213 | char** argv;
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214 | };
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215 |
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216 | static void
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217 | usage(const char *name)
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218 | {
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219 | static const char *const usage_msg[] = {
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220 | "switches:",
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221 | "-v print version number, then run in verbose mode",
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222 | "--verbose run in verbose mode",
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223 | "--version print the version",
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224 | "--copyright print the copyright",
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225 | NULL
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226 | };
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227 | const char *const *p = usage_msg;
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228 |
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229 | printf("Usage: %s [switches]\n", name);
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230 | while (*p)
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231 | printf(" %s\n", *p++);
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232 | }
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233 |
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234 | static int
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235 | parse_args(mrb_state *mrb, int argc, char **argv, struct _args *args)
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236 | {
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237 | static const struct _args args_zero = { 0 };
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238 |
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239 | *args = args_zero;
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240 |
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241 | for (argc--,argv++; argc > 0; argc--,argv++) {
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242 | char *item;
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243 | if (argv[0][0] != '-') break;
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244 |
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245 | item = argv[0] + 1;
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246 | switch (*item++) {
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247 | case 'v':
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248 | if (!args->verbose) mrb_show_version(mrb);
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249 | args->verbose = TRUE;
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250 | break;
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251 | case '-':
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252 | if (strcmp((*argv) + 2, "version") == 0) {
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253 | mrb_show_version(mrb);
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254 | exit(EXIT_SUCCESS);
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255 | }
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256 | else if (strcmp((*argv) + 2, "verbose") == 0) {
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257 | args->verbose = TRUE;
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258 | break;
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259 | }
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260 | else if (strcmp((*argv) + 2, "copyright") == 0) {
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261 | mrb_show_copyright(mrb);
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262 | exit(EXIT_SUCCESS);
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263 | }
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264 | default:
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265 | return EXIT_FAILURE;
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266 | }
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267 | }
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268 |
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269 | if (args->rfp == NULL) {
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270 | if (*argv != NULL) {
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271 | args->rfp = fopen(argv[0], "r");
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272 | if (args->rfp == NULL) {
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273 | printf("Cannot open program file. (%s)\n", *argv);
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274 | return EXIT_FAILURE;
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275 | }
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276 | argc--; argv++;
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277 | }
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278 | }
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279 | args->argv = (char **)mrb_realloc(mrb, args->argv, sizeof(char*) * (argc + 1));
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280 | memcpy(args->argv, argv, (argc+1) * sizeof(char*));
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281 | args->argc = argc;
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282 |
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283 | return EXIT_SUCCESS;
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284 | }
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285 |
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286 | static void
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287 | cleanup(mrb_state *mrb, struct _args *args)
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288 | {
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289 | if (args->rfp)
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290 | fclose(args->rfp);
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291 | mrb_free(mrb, args->argv);
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292 | mrb_close(mrb);
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293 | }
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294 |
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295 | /* Print a short remark for the user */
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296 | static void
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297 | print_hint(void)
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298 | {
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299 | printf("mirb - Embeddable Interactive Ruby Shell\n\n");
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300 | }
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301 |
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302 | #ifndef ENABLE_READLINE
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303 | /* Print the command line prompt of the REPL */
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304 | static void
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305 | print_cmdline(int code_block_open)
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306 | {
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307 | if (code_block_open) {
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308 | printf("* ");
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309 | }
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310 | else {
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311 | printf("> ");
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312 | }
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313 | fflush(stdout);
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314 | }
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315 | #endif
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316 |
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317 | void mrb_codedump_all(mrb_state*, struct RProc*);
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318 |
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319 | static int
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320 | check_keyword(const char *buf, const char *word)
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321 | {
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322 | const char *p = buf;
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323 | size_t len = strlen(word);
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324 |
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325 | /* skip preceding spaces */
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326 | while (*p && isspace((unsigned char)*p)) {
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327 | p++;
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328 | }
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329 | /* check keyword */
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330 | if (strncmp(p, word, len) != 0) {
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331 | return 0;
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332 | }
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333 | p += len;
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334 | /* skip trailing spaces */
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335 | while (*p) {
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336 | if (!isspace((unsigned char)*p)) return 0;
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337 | p++;
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338 | }
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339 | return 1;
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340 | }
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341 |
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342 |
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343 | #ifndef ENABLE_READLINE
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344 | volatile sig_atomic_t input_canceled = 0;
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345 | void
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346 | ctrl_c_handler(int signo)
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347 | {
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348 | input_canceled = 1;
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349 | }
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350 | #else
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351 | SIGJMP_BUF ctrl_c_buf;
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352 | void
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353 | ctrl_c_handler(int signo)
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354 | {
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355 | MIRB_SIGLONGJMP(ctrl_c_buf, 1);
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356 | }
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357 | #endif
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358 |
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359 | int
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360 | main(int argc, char **argv)
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361 | {
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362 | char ruby_code[4096] = { 0 };
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363 | char last_code_line[1024] = { 0 };
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364 | #ifndef ENABLE_READLINE
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365 | int last_char;
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366 | size_t char_index;
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367 | #else
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368 | char *history_path;
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369 | char* line;
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370 | #endif
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371 | mrbc_context *cxt;
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372 | struct mrb_parser_state *parser;
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373 | mrb_state *mrb;
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374 | mrb_value result;
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375 | struct _args args;
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376 | mrb_value ARGV;
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377 | int n;
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378 | int i;
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379 | mrb_bool code_block_open = FALSE;
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380 | int ai;
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381 | unsigned int stack_keep = 0;
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382 |
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383 | /* new interpreter instance */
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384 | mrb = mrb_open();
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385 | if (mrb == NULL) {
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386 | fputs("Invalid mrb interpreter, exiting mirb\n", stderr);
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387 | return EXIT_FAILURE;
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388 | }
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389 |
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390 | n = parse_args(mrb, argc, argv, &args);
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391 | if (n == EXIT_FAILURE) {
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392 | cleanup(mrb, &args);
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393 | usage(argv[0]);
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394 | return n;
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395 | }
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396 |
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397 | ARGV = mrb_ary_new_capa(mrb, args.argc);
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398 | for (i = 0; i < args.argc; i++) {
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399 | char* utf8 = mrb_utf8_from_locale(args.argv[i], -1);
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400 | if (utf8) {
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401 | mrb_ary_push(mrb, ARGV, mrb_str_new_cstr(mrb, utf8));
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402 | mrb_utf8_free(utf8);
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403 | }
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404 | }
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405 | mrb_define_global_const(mrb, "ARGV", ARGV);
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406 |
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407 | #ifdef ENABLE_READLINE
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408 | history_path = get_history_path(mrb);
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409 | if (history_path == NULL) {
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410 | fputs("failed to get history path\n", stderr);
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411 | mrb_close(mrb);
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412 | return EXIT_FAILURE;
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413 | }
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414 |
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415 | MIRB_USING_HISTORY();
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416 | MIRB_READ_HISTORY(history_path);
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417 | #endif
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418 |
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419 | print_hint();
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420 |
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421 | cxt = mrbc_context_new(mrb);
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422 | cxt->capture_errors = TRUE;
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423 | cxt->lineno = 1;
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424 | mrbc_filename(mrb, cxt, "(mirb)");
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425 | if (args.verbose) cxt->dump_result = TRUE;
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426 |
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427 | ai = mrb_gc_arena_save(mrb);
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428 |
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429 | while (TRUE) {
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430 | char *utf8;
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431 |
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432 | if (args.rfp) {
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433 | if (fgets(last_code_line, sizeof(last_code_line)-1, args.rfp) != NULL)
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434 | goto done;
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435 | break;
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436 | }
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437 |
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438 | #ifndef ENABLE_READLINE
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439 | print_cmdline(code_block_open);
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440 |
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441 | signal(SIGINT, ctrl_c_handler);
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442 | char_index = 0;
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443 | while ((last_char = getchar()) != '\n') {
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444 | if (last_char == EOF) break;
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445 | if (char_index >= sizeof(last_code_line)-2) {
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446 | fputs("input string too long\n", stderr);
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447 | continue;
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448 | }
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449 | last_code_line[char_index++] = last_char;
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450 | }
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451 | signal(SIGINT, SIG_DFL);
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452 | if (input_canceled) {
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453 | ruby_code[0] = '\0';
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454 | last_code_line[0] = '\0';
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455 | code_block_open = FALSE;
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456 | puts("^C");
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457 | input_canceled = 0;
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458 | continue;
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459 | }
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460 | if (last_char == EOF) {
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461 | fputs("\n", stdout);
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462 | break;
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463 | }
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464 |
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465 | last_code_line[char_index++] = '\n';
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466 | last_code_line[char_index] = '\0';
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467 | #else
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468 | if (MIRB_SIGSETJMP(ctrl_c_buf) == 0) {
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469 | ;
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470 | }
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471 | else {
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472 | ruby_code[0] = '\0';
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473 | last_code_line[0] = '\0';
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474 | code_block_open = FALSE;
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475 | puts("^C");
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476 | }
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477 | signal(SIGINT, ctrl_c_handler);
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478 | line = MIRB_READLINE(code_block_open ? "* " : "> ");
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479 | signal(SIGINT, SIG_DFL);
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480 |
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481 | if (line == NULL) {
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482 | printf("\n");
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483 | break;
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484 | }
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485 | if (strlen(line) > sizeof(last_code_line)-2) {
|
---|
486 | fputs("input string too long\n", stderr);
|
---|
487 | continue;
|
---|
488 | }
|
---|
489 | strcpy(last_code_line, line);
|
---|
490 | strcat(last_code_line, "\n");
|
---|
491 | MIRB_ADD_HISTORY(line);
|
---|
492 | free(line);
|
---|
493 | #endif
|
---|
494 |
|
---|
495 | done:
|
---|
496 |
|
---|
497 | if (code_block_open) {
|
---|
498 | if (strlen(ruby_code)+strlen(last_code_line) > sizeof(ruby_code)-1) {
|
---|
499 | fputs("concatenated input string too long\n", stderr);
|
---|
500 | continue;
|
---|
501 | }
|
---|
502 | strcat(ruby_code, last_code_line);
|
---|
503 | }
|
---|
504 | else {
|
---|
505 | if (check_keyword(last_code_line, "quit") || check_keyword(last_code_line, "exit")) {
|
---|
506 | break;
|
---|
507 | }
|
---|
508 | strcpy(ruby_code, last_code_line);
|
---|
509 | }
|
---|
510 |
|
---|
511 | utf8 = mrb_utf8_from_locale(ruby_code, -1);
|
---|
512 | if (!utf8) abort();
|
---|
513 |
|
---|
514 | /* parse code */
|
---|
515 | parser = mrb_parser_new(mrb);
|
---|
516 | if (parser == NULL) {
|
---|
517 | fputs("create parser state error\n", stderr);
|
---|
518 | break;
|
---|
519 | }
|
---|
520 | parser->s = utf8;
|
---|
521 | parser->send = utf8 + strlen(utf8);
|
---|
522 | parser->lineno = cxt->lineno;
|
---|
523 | mrb_parser_parse(parser, cxt);
|
---|
524 | code_block_open = is_code_block_open(parser);
|
---|
525 | mrb_utf8_free(utf8);
|
---|
526 |
|
---|
527 | if (code_block_open) {
|
---|
528 | /* no evaluation of code */
|
---|
529 | }
|
---|
530 | else {
|
---|
531 | if (0 < parser->nerr) {
|
---|
532 | /* syntax error */
|
---|
533 | printf("line %d: %s\n", parser->error_buffer[0].lineno, parser->error_buffer[0].message);
|
---|
534 | }
|
---|
535 | else {
|
---|
536 | /* generate bytecode */
|
---|
537 | struct RProc *proc = mrb_generate_code(mrb, parser);
|
---|
538 | if (proc == NULL) {
|
---|
539 | fputs("codegen error\n", stderr);
|
---|
540 | mrb_parser_free(parser);
|
---|
541 | break;
|
---|
542 | }
|
---|
543 |
|
---|
544 | if (args.verbose) {
|
---|
545 | mrb_codedump_all(mrb, proc);
|
---|
546 | }
|
---|
547 | /* pass a proc for evaluation */
|
---|
548 | /* evaluate the bytecode */
|
---|
549 | result = mrb_vm_run(mrb,
|
---|
550 | proc,
|
---|
551 | mrb_top_self(mrb),
|
---|
552 | stack_keep);
|
---|
553 | stack_keep = proc->body.irep->nlocals;
|
---|
554 | /* did an exception occur? */
|
---|
555 | if (mrb->exc) {
|
---|
556 | p(mrb, mrb_obj_value(mrb->exc), 0);
|
---|
557 | mrb->exc = 0;
|
---|
558 | }
|
---|
559 | else {
|
---|
560 | /* no */
|
---|
561 | if (!mrb_respond_to(mrb, result, mrb_intern_lit(mrb, "inspect"))){
|
---|
562 | result = mrb_any_to_s(mrb, result);
|
---|
563 | }
|
---|
564 | p(mrb, result, 1);
|
---|
565 | }
|
---|
566 | }
|
---|
567 | ruby_code[0] = '\0';
|
---|
568 | last_code_line[0] = '\0';
|
---|
569 | mrb_gc_arena_restore(mrb, ai);
|
---|
570 | }
|
---|
571 | mrb_parser_free(parser);
|
---|
572 | cxt->lineno++;
|
---|
573 | }
|
---|
574 |
|
---|
575 | #ifdef ENABLE_READLINE
|
---|
576 | MIRB_WRITE_HISTORY(history_path);
|
---|
577 | mrb_free(mrb, history_path);
|
---|
578 | #endif
|
---|
579 |
|
---|
580 | mrbc_context_free(mrb, cxt);
|
---|
581 | mrb_close(mrb);
|
---|
582 |
|
---|
583 | return 0;
|
---|
584 | }
|
---|