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querystr.go
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querystr.go
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// vim:ts=4:sw=4:noexpandtab
package ranking
import (
"regexp"
"strings"
)
// Represents a query string with pre-compiled regular expressions for faster
// matching.
type QueryStr struct {
query string
boundaryRegexp *regexp.Regexp
anywhereRegexp *regexp.Regexp
}
func NewQueryStr(query string) QueryStr {
var result QueryStr
result.query = query
// Remove (?i) at the beginning of the query, which (at least currently)
// means case-insensitive.
strippedQuery := strings.Replace(query, "(?i)", "", 1)
// XXX: This only works for very simple (one-word) queries.
quotedQuery := regexp.QuoteMeta(strippedQuery)
//fmt.Printf("quoted query: %s\n", quotedQuery)
result.boundaryRegexp = regexp.MustCompile(`(?i)\b` + quotedQuery + `\b`)
result.anywhereRegexp = regexp.MustCompile(`(?i)` + quotedQuery)
return result
}
func (qs *QueryStr) Match(path *string) float32 {
// XXX: These values might need to be tweaked.
index := qs.boundaryRegexp.FindStringIndex(*path)
if index != nil {
return 0.75 + (0.25 * (1.0 - float32(index[0])/float32(len(*path))))
}
index = qs.anywhereRegexp.FindStringIndex(*path)
if index != nil {
return 0.5 + (0.25 * (1.0 - float32(index[0])/float32(len(*path))))
}
return 0.5
}