118 lines
2.1 KiB
C
118 lines
2.1 KiB
C
#include <stdio.h>
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#include "picrin.h"
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#if PIC_ENABLE_READLINE
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# include <string.h>
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# include <stdlib.h>
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# include <readline/readline.h>
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# include <readline/history.h>
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#endif
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#define CODE_MAX_LENGTH 1024
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#define LINE_MAX_LENGTH 256
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int
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main(int argc, char *argv[], char **envp)
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{
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pic_state *pic;
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char code[CODE_MAX_LENGTH] = "", line[LINE_MAX_LENGTH];
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char *read_line, *prompt;
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pic_value v;
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struct pic_proc *proc;
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int ai;
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bool r;
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#if ! PIC_ENABLE_READLINE
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char last_char;
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int char_index;
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#endif
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pic = pic_open(argc, argv, envp);
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ai = pic_gc_arena_preserve(pic);
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while (1) {
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prompt = code[0] == '\0' ? "> " : "* ";
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#if PIC_ENABLE_READLINE
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read_line = readline(prompt);
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if (read_line == NULL) {
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goto eof;
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}
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else {
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strncpy(line, read_line, LINE_MAX_LENGTH - 1);
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add_history(read_line);
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free(read_line);
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}
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#else
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printf(prompt);
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char_index = 0;
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while ((last_char = getchar()) != '\n') {
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if (last_char == EOF)
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goto eof;
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if (char_index == LINE_MAX_LENGTH)
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goto overflow;
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line[char_index++] = last_char;
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}
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line[char_index] = '\0';
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#endif
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if (strlen(code) + strlen(line) >= CODE_MAX_LENGTH)
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goto overflow;
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strcat(code, line);
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/* read */
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r = pic_parse(pic, code, &v);
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if (! r) { /* wait for more input */
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goto next;
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}
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code[0] = '\0';
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if (pic_undef_p(v)) { /* parse error */
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goto next;
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}
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#if DEBUG
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printf("[read: ");
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pic_debug(pic, v);
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printf("]\n");
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#endif
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/* eval */
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proc = pic_codegen(pic, v, pic->global_env);
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if (proc == NULL) {
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printf("compilation error: %s\n", pic->errmsg);
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pic->errmsg = NULL;
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goto next;
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}
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v = pic_run(pic, proc, pic_nil_value());
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if (pic_undef_p(v)) {
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printf("runtime error: %s\n", pic->errmsg);
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pic->errmsg = NULL;
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goto next;
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}
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/* print */
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printf("=> ");
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pic_debug(pic, v);
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printf("\n");
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next:
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pic_gc_arena_restore(pic, ai);
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}
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eof:
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puts("");
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goto exit;
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overflow:
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puts("** [fatal] line input overflow");
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goto exit;
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exit:
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pic_close(pic);
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return 0;
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}
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