traxys/tree-sitter
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Add repeat rules

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This commit is contained in:
Max Brunsfeld 2013-11-15 08:46:45 -08:00
parent 80acabb03e
commit 92e73a9e70
8 changed files with 96 additions and 12 deletions
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20
src/rules/pattern.cpp
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@ -41,21 +41,25 @@ namespace tree_sitter {
case '(':
next();
result = rule();
if (peek() == ')') {
if (peek() != ')')
error("mismatched parens");
else
next();
return result;
} else {
throw std::string("Invalid regex pattern: ") + input;
}
break;
case ')':
error("mismatched parens");
break;
case '\\':
next();
result = character(peek());
next();
break;
default:
result = character(peek());
next();
return result;
break;
}
return result;
}
void next() {
@ -70,6 +74,10 @@ namespace tree_sitter {
return position < length;
}
void error(const char *message) {
throw std::string("Invalid regex pattern '") + input + "': " + message;
}
const std::string input;
const size_t length;
int position;