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ComponentRepeat: remove firsts_cache, precalc code

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Firsts are easy to compute in ComponentRepeat::first() now.
This commit is contained in:
Justin Viiret 2016-01-04 15:33:05 +11:00 committed by Matthew Barr
parent 3d049d6de3
commit e92a20e5fa
2 changed files with 16 additions and 32 deletions
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44
src/parser/ComponentRepeat.cpp
View File

@ -87,8 +87,7 @@ ComponentRepeat::ComponentRepeat(const ComponentRepeat &other)
type(other.type), sub_comp(unique_ptr<Component>(other.sub_comp->clone())),
m_min(other.m_min), m_max(other.m_max),
m_firsts(other.m_firsts), m_lasts(other.m_lasts),
posFirst(other.posFirst), posLast(other.posLast),
firsts_cache(other.firsts_cache) {}
posFirst(other.posFirst), posLast(other.posLast) {}
bool ComponentRepeat::empty() const {
return m_min == 0 || sub_comp->empty();
@ -175,14 +174,24 @@ void ComponentRepeat::notePositions(GlushkovBuildState &bs) {
}
recordPosBounds(posFirst, bs.getBuilder().numVertices());
precalc_firsts(); /* ComponentRepeat requires firsts to be calculated ahead
* of time and cached due to expense */
// Each optional repeat has an epsilon at the end of its firsts list.
for (u32 i = m_min; i < m_firsts.size(); i++) {
m_firsts[i].push_back(GlushkovBuildState::POS_EPSILON);
}
}
vector<PositionInfo> ComponentRepeat::first() const {
DEBUG_PRINTF("firsts = %s\n", dumpPositions(firsts_cache.begin(),
firsts_cache.end()).c_str());
return firsts_cache;
if (!m_max) {
return {};
}
assert(!m_firsts.empty()); // notePositions should already have run
const vector<PositionInfo> &firsts = m_firsts.front();
DEBUG_PRINTF("firsts = %s\n",
dumpPositions(begin(firsts), end(firsts)).c_str());
return firsts;
}
void ComponentRepeat::buildFollowSet(GlushkovBuildState &bs,
@ -331,27 +340,6 @@ inf_check:
}
}
void ComponentRepeat::precalc_firsts() {
DEBUG_PRINTF("building firsts for {%u,%u} repeat with %s sub\n", m_min,
m_max, sub_comp->empty() ? "emptiable" : "non-emptiable");
/* For normal repeat, our optional repeats each have an epsilon at the end
* of their firsts lists.
*/
for (u32 i = m_min; i < m_firsts.size(); i++) {
m_firsts[i].push_back(GlushkovBuildState::POS_EPSILON);
}
firsts_cache.clear();
if (!m_max) {
return;
}
assert(!m_firsts.empty()); // notePositions should already have run
const vector<PositionInfo> &f = m_firsts.front();
firsts_cache.insert(firsts_cache.end(), f.begin(), f.end());
}
static
bool hasPositionFlags(const Component &c) {
for (const auto &e : c.first()) {

4
src/parser/ComponentRepeat.h
View File

@ -120,8 +120,6 @@ public:
enum RepeatType type;
protected:
/** Called by \ref buildFollowSet to connect up the various repeats. */
void precalc_firsts();
void postSubNotePositionHook();
void wireRepeats(GlushkovBuildState &bs);
@ -134,8 +132,6 @@ protected:
Position posFirst;
Position posLast;
std::vector<PositionInfo> firsts_cache;
ComponentRepeat(const ComponentRepeat &other);
};