hare

commit 8c1ca1afada2eca337fd466a79e6fb46d2ffecfe
parent 2fc399c5e592dc6c8114e790510d4b232f0d341a
Author: Alexey Yerin <yyp@disroot.org>
Date:   Sun, 19 Feb 2023 22:52:39 +0300

hare::lex: error out when encountering an invalid escape sequence

Signed-off-by: Alexey Yerin <yyp@disroot.org>

Diffstat:
M
hare/lex/+test.ha
 | 
10
++++++++++
M
hare/lex/lex.ha
 | 
2
++

2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/hare/lex/+test.ha b/hare/lex/+test.ha
@@ -322,6 +322,16 @@ fn loc(line: uint, col: uint) location = location {
 
 	const s = lex(&lexer) as error as syntax;
 	assert(s.1 == "Source file is not valid UTF-8");
+
+	// Regression: invalid escape sequences such as "\^" used to casue a
+	// crash
+	const in = ['"': u8, '\\': u8, '^': u8, '"': u8];
+
+	let buf = bufio::fixed(in, mode::READ);
+	let lexer = init(&buf, "<test>");
+
+	const s = lex(&lexer) as error as syntax;
+	assert(s.1 == "unknown escape sequence");
 };
 
 
diff --git a/hare/lex/lex.ha b/hare/lex/lex.ha
@@ -218,6 +218,8 @@ fn lex_rune(lex: *lexer, loc: location) (rune | error) = {
 		return lex_unicode(lex, loc, 4);
 	case 'U' =>
 		return lex_unicode(lex, loc, 8);
+	case =>
+		return syntaxerr(mkloc(lex), "unknown escape sequence");
 	};
 };