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Add support for Hamming distance approx matching

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This commit is contained in:
Matthew Barr
2017-10-10 15:26:35 +11:00
committed by Xiang Wang
parent 5827bd1c2b
commit 1891f14755
13 changed files with 169 additions and 56 deletions
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7
src/nfagraph/ng_expr_info.cpp
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@@ -161,14 +161,17 @@ void fillExpressionInfo(ReportManager &rm, const CompileContext &cc,
throw CompileError(expr.index, "Pattern can never match.");
}
bool hamming = expr.hamm_distance > 0;
u32 e_dist = hamming ? expr.hamm_distance : expr.edit_distance;
// validate graph's suitability for fuzzing
validate_fuzzy_compile(g, expr.edit_distance, expr.utf8, cc.grey);
validate_fuzzy_compile(g, e_dist, hamming, expr.utf8, cc.grey);
resolveAsserts(rm, g, expr);
assert(allMatchStatesHaveReports(g));
// fuzz graph - this must happen before any transformations are made
make_fuzzy(g, expr.edit_distance, cc.grey);
make_fuzzy(g, e_dist, hamming, cc.grey);
pruneUseless(g);
pruneEmptyVertices(g);