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