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Regex: Various small code tweaks

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This commit is contained in:
Maxime Coste 2017-11-28 01:03:54 +08:00
parent 4598832ed5
commit ae0911b533
1 changed files with 12 additions and 13 deletions
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23
src/regex_impl.cc
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@ -79,6 +79,7 @@ struct ParsedRegex
Codepoint value; Codepoint value;
Quantifier quantifier; Quantifier quantifier;
}; };
static_assert(sizeof(Node) == 16, "");
Vector<Node, MemoryDomain::Regex> nodes; Vector<Node, MemoryDomain::Regex> nodes;
@ -503,13 +504,13 @@ private:
return {ParsedRegex::Quantifier::One}; return {ParsedRegex::Quantifier::One};
constexpr int max_repeat = 1000; constexpr int max_repeat = 1000;
auto read_bound = [max_repeat, this](auto& pos, auto begin, auto end) { auto read_bound = [&]() {
int16_t res = 0; int16_t res = 0;
for (; pos != end; ++pos) for (auto begin = m_pos; m_pos != m_regex.end(); ++m_pos)
{ {
const auto cp = *pos; const auto cp = *m_pos;
if (cp < '0' or cp > '9') if (cp < '0' or cp > '9')
return pos == begin ? (int16_t)-1 : res; return m_pos == begin ? (int16_t)-1 : res;
res = res * 10 + cp - '0'; res = res * 10 + cp - '0';
if (res > max_repeat) if (res > max_repeat)
parse_error(format("Explicit quantifier is too big, maximum is {}", max_repeat)); parse_error(format("Explicit quantifier is too big, maximum is {}", max_repeat));
@ -531,17 +532,16 @@ private:
case '?': ++m_pos; return {ParsedRegex::Quantifier::Optional, check_greedy()}; case '?': ++m_pos; return {ParsedRegex::Quantifier::Optional, check_greedy()};
case '{': case '{':
{ {
auto it = m_pos+1; ++m_pos;
const int16_t min = read_bound(it, it, m_regex.end()); const int16_t min = read_bound();
int16_t max = min; int16_t max = min;
if (*it == ',') if (*m_pos == ',')
{ {
++it; ++m_pos;
max = read_bound(it, it, m_regex.end()); max = read_bound();
} }
if (*it++ != '}') if (*m_pos++ != '}')
parse_error("expected closing bracket"); parse_error("expected closing bracket");
m_pos = it;
return {ParsedRegex::Quantifier::RepeatMinMax, check_greedy(), min, max}; return {ParsedRegex::Quantifier::RepeatMinMax, check_greedy(), min, max};
} }
default: return {ParsedRegex::Quantifier::One}; default: return {ParsedRegex::Quantifier::One};
@ -887,7 +887,6 @@ private:
case ParsedRegex::AnyChar: case ParsedRegex::AnyChar:
for (auto& b : start_chars.map) for (auto& b : start_chars.map)
b = true; b = true;
start_chars.map[CompiledRegex::StartChars::other] = true;
return node.quantifier.allows_none(); return node.quantifier.allows_none();
case ParsedRegex::Class: case ParsedRegex::Class:
{ {