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dfa: prune_overlong -> clear_deeper_reports

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Rather than pruning states, we simply clear reports on states that are
too deep and allow Hopcroft minimisation to reduce the size of the DFA
afterwards.
This commit is contained in:
Justin Viiret
2017-04-13 13:18:33 +10:00
committed by Matthew Barr
parent 8650a1a33f
commit 41d7aa8281
3 changed files with 18 additions and 107 deletions
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4
src/smallwrite/smallwrite_build.cpp
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@@ -279,7 +279,7 @@ void SmallWriteBuildImpl::add(const NGHolder &g, const ExpressionInfo &expr) {
return;
}
if (prune_overlong(*r, cc.grey.smallWriteLargestBuffer)) {
if (clear_deeper_reports(*r, cc.grey.smallWriteLargestBuffer)) {
minimize_hopcroft(*r, cc.grey);
}
@@ -725,7 +725,7 @@ bytecode_ptr<NFA> prepEngine(raw_dfa &rdfa, u32 roseQuality,
if (*small_region <= *start_offset) {
return nullptr;
}
if (prune_overlong(rdfa, *small_region - *start_offset)) {
if (clear_deeper_reports(rdfa, *small_region - *start_offset)) {
minimize_hopcroft(rdfa, cc.grey);
if (rdfa.start_anchored == DEAD_STATE) {
DEBUG_PRINTF("all patterns pruned out\n");