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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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10
util/ExpressionParser.rl
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@@ -49,7 +49,8 @@ enum ParamKey {
PARAM_MIN_OFFSET,
PARAM_MAX_OFFSET,
PARAM_MIN_LENGTH,
PARAM_EDIT_DISTANCE
PARAM_EDIT_DISTANCE,
PARAM_HAMM_DISTANCE
};
%%{
@@ -97,6 +98,10 @@ enum ParamKey {
ext->flags |= HS_EXT_FLAG_EDIT_DISTANCE;
ext->edit_distance = num;
break;
case PARAM_HAMM_DISTANCE:
ext->flags |= HS_EXT_FLAG_HAMMING_DISTANCE;
ext->hamming_distance = num;
break;
case PARAM_NONE:
default:
// No key specified, syntax invalid.
@@ -158,7 +163,8 @@ bool HS_CDECL readExpression(const std::string &input, std::string &expr,
param = ('min_offset' @{ key = PARAM_MIN_OFFSET; } |
'max_offset' @{ key = PARAM_MAX_OFFSET; } |
'min_length' @{ key = PARAM_MIN_LENGTH; } |
'edit_distance' @{ key = PARAM_EDIT_DISTANCE; });
'edit_distance' @{ key = PARAM_EDIT_DISTANCE; } |
'hamming_distance' @{ key = PARAM_HAMM_DISTANCE; });
value = (digit @accumulateNum)+ >{num = 0;};
param_spec = (' '* param '=' value ' '*) >{ key = PARAM_NONE; }