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[3.11] gh-112387: Fix error positions for decoded strings with backwards tokenize errors (GH-112409) #112469

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Merged
merged 1 commit into from
Nov 27, 2023
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[3.11] gh-112387: Fix error positions for decoded strings with backwards tokenize errors (GH-112409) #112469

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4 changes: 4 additions & 0 deletions Lib/test/test_syntax.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2143,6 +2143,10 @@ def test_error_parenthesis(self):
"""
self._check_error(code, "parenthesis '\\)' does not match opening parenthesis '\\['")

# Examples with dencodings
s = b'# coding=latin\n(aaaaaaaaaaaaaaaaa\naaaaaaaaaaa\xb5'
self._check_error(s, "'\(' was never closed")

def test_error_string_literal(self):

self._check_error("'blech", "unterminated string literal")
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2023-11-25-22-39-44.gh-issue-112387.AbBq5W.rst
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@@ -0,0 +1,2 @@
Fix error positions for decoded strings with backwards tokenize errors.
Patch by Pablo Galindo
4 changes: 4 additions & 0 deletions Parser/pegen_errors.c
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Expand Up @@ -266,6 +266,10 @@ get_error_line_from_tokenizer_buffers(Parser *p, Py_ssize_t lineno)
Py_ssize_t relative_lineno = p->starting_lineno ? lineno - p->starting_lineno + 1 : lineno;
const char* buf_end = p->tok->fp_interactive ? p->tok->interactive_src_end : p->tok->inp;

if (buf_end < cur_line) {
buf_end = cur_line + strlen(cur_line);
}

for (int i = 0; i < relative_lineno - 1; i++) {
char *new_line = strchr(cur_line, '\n');
// The assert is here for debug builds but the conditional that
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