[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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| 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 | 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 | strcpy(last_code_line, line);
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| 401 | strcat(last_code_line, "\n");
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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 | strcat(ruby_code, last_code_line);
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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 | strcpy(ruby_code, last_code_line);
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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 | }
|
---|
| 473 | p(mrb, result, 1);
|
---|
| 474 | }
|
---|
| 475 | }
|
---|
| 476 | ruby_code[0] = '\0';
|
---|
| 477 | last_code_line[0] = '\0';
|
---|
| 478 | mrb_gc_arena_restore(mrb, ai);
|
---|
| 479 | }
|
---|
| 480 | mrb_parser_free(parser);
|
---|
| 481 | cxt->lineno++;
|
---|
| 482 | }
|
---|
| 483 |
|
---|
| 484 | #ifdef ENABLE_READLINE
|
---|
| 485 | MIRB_WRITE_HISTORY(history_path);
|
---|
| 486 | mrb_free(mrb, history_path);
|
---|
| 487 | #endif
|
---|
| 488 |
|
---|
| 489 | mrbc_context_free(mrb, cxt);
|
---|
| 490 | mrb_close(mrb);
|
---|
| 491 |
|
---|
| 492 | return 0;
|
---|
| 493 | }
|
---|