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-rw-r--r--parse.y29
1 files changed, 23 insertions, 6 deletions
diff --git a/parse.y b/parse.y
index 7aa04c8..4841743 100644
--- a/parse.y
+++ b/parse.y
@@ -2516,7 +2516,9 @@ static int
yyerror(msg)
const char *msg;
{
- char *p, *pe, *buf;
+ const int max_line_margin = 30;
+ const char *p, *pe;
+ char *buf;
int len, i;
rb_compile_error("%s", msg);
@@ -2535,17 +2537,32 @@ yyerror(msg)
len = pe - p;
if (len > 4) {
+ char *p2;
+ const char *pre = "", *post = "";
+
+ if (len > max_line_margin * 2 + 10) {
+ int re_mbc_startpos _((const char *, int, int, int));
+ if ((len = lex_p - p) > max_line_margin) {
+ p = p + re_mbc_startpos(p, len, len - max_line_margin, 0);
+ pre = "...";
+ }
+ if ((len = pe - lex_p) > max_line_margin) {
+ pe = lex_p + re_mbc_startpos(lex_p, len, max_line_margin, 1);
+ post = "...";
+ }
+ len = pe - p;
+ }
buf = ALLOCA_N(char, len+2);
MEMCPY(buf, p, char, len);
buf[len] = '\0';
- rb_compile_error_append("%s", buf);
+ rb_compile_error_append("%s%s%s", pre, buf, post);
i = lex_p - p;
- p = buf; pe = p + len;
+ p2 = buf; pe = buf + len;
- while (p < pe) {
- if (*p != '\t') *p = ' ';
- p++;
+ while (p2 < pe) {
+ if (*p2 != '\t') *p2 = ' ';
+ p2++;
}
buf[i] = '^';
buf[i+1] = '\0';