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mirb_editor.c: table-drive is_dedent_keyword()

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Replace the if-else chain with a data table that encodes each
dedent keyword, its valid delimiters, and whether it can appear
at end of line.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-01-31 21:12:00 +09:00
parent d6b06634ec
commit 9b24e120bc
1 changed files with 27 additions and 14 deletions
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mrbgems/mruby-bin-mirb/tools/mirb/mirb_editor.c
+27 -14
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@@ -40,25 +40,38 @@ leading_spaces(const char *line)
}
/*
* Check if content starts with a dedenting keyword
* (end, else, elsif, when, in, rescue, ensure) or '}'
* Dedent keyword table: keywords that reduce indentation level.
* allow_eol: keyword can appear alone at end of line
* delims: valid non-NUL characters that can follow the keyword
*/
static const struct {
const char *word;
const char *delims;
mrb_bool allow_eol;
} dedent_table[] = {
{"else", " \t", TRUE},
{"elsif", " ", FALSE},
{"end", " \t.)", TRUE},
{"ensure", " \t", TRUE},
{"in", " ", FALSE},
{"rescue", " \t", TRUE},
{"when", " ", FALSE},
};
static mrb_bool
is_dedent_keyword(const char *content)
{
size_t i;
if (content[0] == '}') return TRUE;
if (strncmp(content, "end", 3) == 0 &&
(content[3] == '\0' || content[3] == ' ' || content[3] == '\t' ||
content[3] == '.' || content[3] == ')')) return TRUE;
if (strncmp(content, "else", 4) == 0 &&
(content[4] == '\0' || content[4] == ' ' || content[4] == '\t')) return TRUE;
if (strncmp(content, "elsif", 5) == 0 && content[5] == ' ') return TRUE;
if (strncmp(content, "when", 4) == 0 && content[4] == ' ') return TRUE;
if (strncmp(content, "in", 2) == 0 && content[2] == ' ') return TRUE;
if (strncmp(content, "rescue", 6) == 0 &&
(content[6] == '\0' || content[6] == ' ' || content[6] == '\t')) return TRUE;
if (strncmp(content, "ensure", 6) == 0 &&
(content[6] == '\0' || content[6] == ' ' || content[6] == '\t')) return TRUE;
for (i = 0; i < sizeof(dedent_table)/sizeof(dedent_table[0]); i++) {
size_t len = strlen(dedent_table[i].word);
if (strncmp(content, dedent_table[i].word, len) == 0) {
char c = content[len];
if (c == '\0') return dedent_table[i].allow_eol;
return strchr(dedent_table[i].delims, c) != NULL;
}
}
return FALSE;
}