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|
package search
import (
"searchEngine/analyzer"
"searchEngine/index"
)
func Search(idx *index.InvertedIndex, query string) []string {
tokenizedQuery := analyzer.ProcessText(query)
if len(tokenizedQuery) == 0 {
return nil
}
idx.Mu.RLock()
defer idx.Mu.RUnlock()
firstToken := tokenizedQuery[0]
baseIDs, exists := idx.Data[firstToken]
if !exists {
return nil
}
intersection := make([]index.Posting, len(baseIDs))
copy(intersection, baseIDs)
for i := 1; i < len(tokenizedQuery); i++ {
token := tokenizedQuery[i]
nextIDs, exists := idx.Data[token]
if !exists {
return nil
}
lookup := make(map[int]struct{})
for _, id := range nextIDs {
lookup[id.DocId] = struct{}{}
}
var filtered []index.Posting
for _, id := range intersection {
if _, found := lookup[id.DocId]; found {
filtered = append(filtered, id)
}
}
intersection = filtered
}
var results []string
for _, id := range intersection {
if title, exists := idx.DocNames[id.DocId]; exists {
results = append(results, title)
}
}
return results
}
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