[270] | 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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[331] | 14 | #include <signal.h>
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| 15 | #include <setjmp.h>
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| 16 |
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[270] | 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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[331] | 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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[270] | 44 |
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[331] | 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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[270] | 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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[331] | 210 | FILE *rfp;
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[270] | 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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[331] | 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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[270] | 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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[331] | 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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[270] | 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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[331] | 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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[270] | 359 | int
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| 360 | main(int argc, char **argv)
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| 361 | {
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[331] | 362 | char ruby_code[4096] = { 0 };
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[270] | 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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[331] | 366 | size_t char_index;
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[270] | 367 | #else
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| 368 | char *history_path;
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[331] | 369 | char* line;
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[270] | 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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[331] | 376 | mrb_value ARGV;
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[270] | 377 | int n;
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[331] | 378 | int i;
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[270] | 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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[331] | 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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[270] | 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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[331] | 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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[270] | 438 | #ifndef ENABLE_READLINE
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| 439 | print_cmdline(code_block_open);
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| 440 |
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[331] | 441 | signal(SIGINT, ctrl_c_handler);
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[270] | 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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[331] | 445 | if (char_index >= sizeof(last_code_line)-2) {
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[270] | 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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[331] | 451 | signal(SIGINT, SIG_DFL);
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| 452 | if (input_canceled) {
|
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| 453 | ruby_code[0] = '\0';
|
---|
| 454 | last_code_line[0] = '\0';
|
---|
| 455 | code_block_open = FALSE;
|
---|
| 456 | puts("^C");
|
---|
| 457 | input_canceled = 0;
|
---|
| 458 | continue;
|
---|
| 459 | }
|
---|
[270] | 460 | if (last_char == EOF) {
|
---|
| 461 | fputs("\n", stdout);
|
---|
| 462 | break;
|
---|
| 463 | }
|
---|
| 464 |
|
---|
| 465 | last_code_line[char_index++] = '\n';
|
---|
| 466 | last_code_line[char_index] = '\0';
|
---|
| 467 | #else
|
---|
[331] | 468 | if (MIRB_SIGSETJMP(ctrl_c_buf) == 0) {
|
---|
| 469 | ;
|
---|
| 470 | }
|
---|
| 471 | else {
|
---|
| 472 | ruby_code[0] = '\0';
|
---|
| 473 | last_code_line[0] = '\0';
|
---|
| 474 | code_block_open = FALSE;
|
---|
| 475 | puts("^C");
|
---|
| 476 | }
|
---|
| 477 | signal(SIGINT, ctrl_c_handler);
|
---|
| 478 | line = MIRB_READLINE(code_block_open ? "* " : "> ");
|
---|
| 479 | signal(SIGINT, SIG_DFL);
|
---|
| 480 |
|
---|
[270] | 481 | if (line == NULL) {
|
---|
| 482 | printf("\n");
|
---|
| 483 | break;
|
---|
| 484 | }
|
---|
| 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 |
|
---|
[331] | 495 | done:
|
---|
| 496 |
|
---|
[270] | 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 | }
|
---|
[331] | 547 | /* pass a proc for evaluation */
|
---|
[270] | 548 | /* evaluate the bytecode */
|
---|
[331] | 549 | result = mrb_vm_run(mrb,
|
---|
[270] | 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 | }
|
---|