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bpo-33306: Improve SyntaxError messages for unbalanced parentheses. (GH-6516)

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Serhiy Storchaka 2018-12-17 17:34:14 +02:00 • committed by GitHub
parent bdabb0737c
commit 94cf308ee2
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5 changed files with 47 additions and 7 deletions
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32
Parser/tokenizer.c
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@ -1842,12 +1842,44 @@ tok_get(struct tok_state *tok, char **p_start, char **p_end)
case '(':
case '[':
case '{':
#ifndef PGEN
if (tok->level >= MAXLEVEL) {
return syntaxerror(tok, "too many nested parentheses");
}
tok->parenstack[tok->level] = c;
tok->parenlinenostack[tok->level] = tok->lineno;
#endif
tok->level++;
break;
case ')':
case ']':
case '}':
#ifndef PGEN
if (!tok->level) {
return syntaxerror(tok, "unmatched '%c'", c);
}
#endif
tok->level--;
#ifndef PGEN
int opening = tok->parenstack[tok->level];
if (!((opening == '(' && c == ')') ||
(opening == '[' && c == ']') ||
(opening == '{' && c == '}')))
{
if (tok->parenlinenostack[tok->level] != tok->lineno) {
return syntaxerror(tok,
"closing parenthesis '%c' does not match "
"opening parenthesis '%c' on line %d",
c, opening, tok->parenlinenostack[tok->level]);
}
else {
return syntaxerror(tok,
"closing parenthesis '%c' does not match "
"opening parenthesis '%c'",
c, opening);
}
}
#endif
break;
}