From 52866db1fef59c3138300f00283bf9e8ef1bb3a8 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 25 Sep 2007 20:12:24 +0000
Subject: * parse.y (parser_yyerror): limit error message length.  
 [ruby-dev:31848]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13514 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 parse.y | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'parse.y')

diff --git a/parse.y b/parse.y
index 4511a64e15..1b28727bea 100644
--- a/parse.y
+++ b/parse.y
@@ -4572,6 +4572,7 @@ static int
 parser_yyerror(struct parser_params *parser, const char *msg)
 {
 #ifndef RIPPER
+    const int max_line_margin = 30;
     const char *p, *pe;
     char *buf;
     int len, i;
@@ -4593,10 +4594,23 @@ parser_yyerror(struct parser_params *parser, const char *msg)
     len = pe - p;
     if (len > 4) {
 	char *p2;
+	const char *pre = "", *post = "";
+
+	if (len > max_line_margin * 2 + 10) {
+	    if (lex_p - p > max_line_margin) {
+		p = rb_enc_prev_char(p, lex_p - max_line_margin, rb_enc_get(lex_lastline));
+		pre = "...";
+	    }
+	    if (pe - lex_p > max_line_margin) {
+		pe = rb_enc_prev_char(lex_p, lex_p + max_line_margin, rb_enc_get(lex_lastline));
+		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;
 	p2 = buf; pe = buf + len;
@@ -4607,7 +4621,7 @@ parser_yyerror(struct parser_params *parser, const char *msg)
 	}
 	buf[i] = '^';
 	buf[i+1] = '\0';
-	rb_compile_error_append("%s", buf);
+	rb_compile_error_append("%s%s", pre, buf);
     }
 #else
     dispatch1(parse_error, STR_NEW2(msg));
-- 
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