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Use bit-flags for storing regex regex options

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This commit is contained in:
Olivier Perret 2018-06-17 12:28:07 +02:00
parent 8edef8b3f1
commit b5ee1db1c4
1 changed files with 23 additions and 15 deletions
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34
src/regex_impl.cc
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@ -153,6 +153,14 @@ private:
Codepoint operator()(Codepoint cp) { throw regex_error{"Invalid utf8 in regex"}; } Codepoint operator()(Codepoint cp) { throw regex_error{"Invalid utf8 in regex"}; }
}; };
enum class Flags
{
None = 0,
IgnoreCase = 1 << 0,
DotMatchesNewLine = 1 << 1,
};
friend constexpr bool with_bit_ops(Meta::Type<Flags>) { return true; }
using Iterator = utf8::iterator<const char*, Codepoint, int, InvalidPolicy>; using Iterator = utf8::iterator<const char*, Codepoint, int, InvalidPolicy>;
using NodeIndex = ParsedRegex::NodeIndex; using NodeIndex = ParsedRegex::NodeIndex;
@ -204,17 +212,17 @@ private:
while (true) while (true)
{ {
auto m = *it++; auto m = *it++;
if (m == 'i' or m == 'I') switch (m)
m_ignore_case = (m == 'i');
else if (m == 's' or m == 'S')
m_dot_maches_newline = (m == 's');
else if (m == ')')
{ {
case 'i': m_flags |= Flags::IgnoreCase; break;
case 'I': m_flags &= ~Flags::IgnoreCase; break;
case 's': m_flags |= Flags::DotMatchesNewLine; break;
case 'S': m_flags &= ~Flags::DotMatchesNewLine; break;
case ')':
m_pos = Iterator{it, m_regex}; m_pos = Iterator{it, m_regex};
return true; return true;
default: return false;
} }
else
return false;
} }
} }
return false; return false;
@ -285,7 +293,7 @@ private:
{ {
case '.': case '.':
++m_pos; ++m_pos;
if (m_dot_maches_newline) if (m_flags & Flags::DotMatchesNewLine)
return new_node(ParsedRegex::AnyChar); return new_node(ParsedRegex::AnyChar);
else else
{ {
@ -431,7 +439,7 @@ private:
{ {
CharacterClass character_class; CharacterClass character_class;
character_class.ignore_case = m_ignore_case; character_class.ignore_case = (m_flags & Flags::IgnoreCase);
character_class.negative = m_pos != m_regex.end() and *m_pos == '^'; character_class.negative = m_pos != m_regex.end() and *m_pos == '^';
if (character_class.negative) if (character_class.negative)
++m_pos; ++m_pos;
@ -492,7 +500,7 @@ private:
parse_error("unclosed character class"); parse_error("unclosed character class");
++m_pos; ++m_pos;
if (m_ignore_case) if (character_class.ignore_case)
{ {
for (auto& range : character_class.ranges) for (auto& range : character_class.ranges)
{ {
@ -578,7 +586,7 @@ private:
if (res == max_nodes) if (res == max_nodes)
parse_error(format("regex parsed to more than {} ast nodes", max_nodes)); parse_error(format("regex parsed to more than {} ast nodes", max_nodes));
const NodeIndex next = res+1; const NodeIndex next = res+1;
m_parsed_regex.nodes.push_back({op, m_ignore_case, next, value, quantifier}); m_parsed_regex.nodes.push_back({op, m_flags & Flags::IgnoreCase, next, value, quantifier});
return res; return res;
} }
@ -614,8 +622,8 @@ private:
ParsedRegex m_parsed_regex; ParsedRegex m_parsed_regex;
StringView m_regex; StringView m_regex;
Iterator m_pos; Iterator m_pos;
bool m_ignore_case = false;
bool m_dot_maches_newline = true; Flags m_flags = Flags::DotMatchesNewLine;
static constexpr struct CharacterClassEscape { static constexpr struct CharacterClassEscape {
Codepoint cp; Codepoint cp;