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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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15
src/compiler/compiler.cpp
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@@ -78,7 +78,8 @@ void validateExt(const hs_expr_ext &ext) {
static const unsigned long long ALL_EXT_FLAGS = HS_EXT_FLAG_MIN_OFFSET |
HS_EXT_FLAG_MAX_OFFSET |
HS_EXT_FLAG_MIN_LENGTH |
HS_EXT_FLAG_EDIT_DISTANCE;
HS_EXT_FLAG_EDIT_DISTANCE |
HS_EXT_FLAG_HAMMING_DISTANCE;
if (ext.flags & ~ALL_EXT_FLAGS) {
throw CompileError("Invalid hs_expr_ext flag set.");
}
@@ -96,6 +97,13 @@ void validateExt(const hs_expr_ext &ext) {
throw CompileError("In hs_expr_ext, min_length must be less than or "
"equal to max_offset.");
}
if ((ext.flags & HS_EXT_FLAG_EDIT_DISTANCE) &&
(ext.flags & HS_EXT_FLAG_HAMMING_DISTANCE)) {
throw CompileError("In hs_expr_ext, cannot have both edit distance and "
"Hamming distance.");
}
}
ParsedExpression::ParsedExpression(unsigned index_in, const char *expression,
@@ -103,7 +111,7 @@ ParsedExpression::ParsedExpression(unsigned index_in, const char *expression,
const hs_expr_ext *ext)
: expr(index_in, flags & HS_FLAG_ALLOWEMPTY, flags & HS_FLAG_SINGLEMATCH,
false, flags & HS_FLAG_PREFILTER, SOM_NONE, report, 0, MAX_OFFSET,
0, 0) {
0, 0, 0) {
ParseMode mode(flags);
component = parse(expression, mode);
@@ -158,6 +166,9 @@ ParsedExpression::ParsedExpression(unsigned index_in, const char *expression,
if (ext->flags & HS_EXT_FLAG_EDIT_DISTANCE) {
expr.edit_distance = ext->edit_distance;
}
if (ext->flags & HS_EXT_FLAG_HAMMING_DISTANCE) {
expr.hamm_distance = ext->hamming_distance;
}
}
// These are validated in validateExt, so an error will already have been