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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package godoc
import (
"bytes"
"fmt"
"net/http"
"regexp"
"strings"
)
type SearchResult struct {
Query string
Alert string // error or warning message
// identifier matches
Pak HitList // packages matching Query
Hit *LookupResult // identifier matches of Query
Alt *AltWords // alternative identifiers to look for
// textual matches
Found int // number of textual occurrences found
Textual []FileLines // textual matches of Query
Complete bool // true if all textual occurrences of Query are reported
Idents map[SpotKind][]Ident
}
func (c *Corpus) Lookup(query string) SearchResult {
result := &SearchResult{Query: query}
index, timestamp := c.CurrentIndex()
if index != nil {
// identifier search
if r, err := index.Lookup(query); err == nil {
result = r
} else if err != nil && !c.IndexFullText {
// ignore the error if full text search is enabled
// since the query may be a valid regular expression
result.Alert = "Error in query string: " + err.Error()
return *result
}
// full text search
if c.IndexFullText && query != "" {
rx, err := regexp.Compile(query)
if err != nil {
result.Alert = "Error in query regular expression: " + err.Error()
return *result
}
// If we get maxResults+1 results we know that there are more than
// maxResults results and thus the result may be incomplete (to be
// precise, we should remove one result from the result set, but
// nobody is going to count the results on the result page).
result.Found, result.Textual = index.LookupRegexp(rx, c.MaxResults+1)
result.Complete = result.Found <= c.MaxResults
if !result.Complete {
result.Found-- // since we looked for maxResults+1
}
}
}
// is the result accurate?
if c.IndexEnabled {
if ts := c.FSModifiedTime(); timestamp.Before(ts) {
// The index is older than the latest file system change under godoc's observation.
result.Alert = "Indexing in progress: result may be inaccurate"
}
} else {
result.Alert = "Search index disabled: no results available"
}
return *result
}
// SearchResultDoc optionally specifies a function returning an HTML body
// displaying search results matching godoc documentation.
func (p *Presentation) SearchResultDoc(result SearchResult) []byte {
return applyTemplate(p.SearchDocHTML, "searchDocHTML", result)
}
// SearchResultCode optionally specifies a function returning an HTML body
// displaying search results matching source code.
func (p *Presentation) SearchResultCode(result SearchResult) []byte {
return applyTemplate(p.SearchCodeHTML, "searchCodeHTML", result)
}
// SearchResultTxt optionally specifies a function returning an HTML body
// displaying search results of textual matches.
func (p *Presentation) SearchResultTxt(result SearchResult) []byte {
return applyTemplate(p.SearchTxtHTML, "searchTxtHTML", result)
}
// HandleSearch obtains results for the requested search and returns a page
// to display them.
func (p *Presentation) HandleSearch(w http.ResponseWriter, r *http.Request) {
query := strings.TrimSpace(r.FormValue("q"))
result := p.Corpus.Lookup(query)
var contents bytes.Buffer
for _, f := range p.SearchResults {
contents.Write(f(p, result))
}
var title string
if haveResults := contents.Len() > 0; haveResults {
title = fmt.Sprintf(`Results for query: %v`, query)
if !p.Corpus.IndexEnabled {
result.Alert = ""
}
} else {
title = fmt.Sprintf(`No results found for query %q`, query)
}
body := bytes.NewBuffer(applyTemplate(p.SearchHTML, "searchHTML", result))
body.Write(contents.Bytes())
p.ServePage(w, Page{
Title: title,
Tabtitle: query,
Query: query,
Body: body.Bytes(),
})
}
func (p *Presentation) serveSearchDesc(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/opensearchdescription+xml")
data := map[string]interface{}{
"BaseURL": fmt.Sprintf("http://%s", r.Host),
}
applyTemplateToResponseWriter(w, p.SearchDescXML, &data)
}
// tocColCount returns the no. of columns
// to split the toc table to.
func tocColCount(result SearchResult) int {
tocLen := tocLen(result)
colCount := 0
// Simple heuristic based on visual aesthetic in manual testing.
switch {
case tocLen <= 10:
colCount = 1
case tocLen <= 20:
colCount = 2
case tocLen <= 80:
colCount = 3
default:
colCount = 4
}
return colCount
}
// tocLen calculates the no. of items in the toc table
// by going through various fields in the SearchResult
// that is rendered in the UI.
func tocLen(result SearchResult) int {
tocLen := 0
for _, val := range result.Idents {
if len(val) != 0 {
tocLen++
}
}
// If no identifiers, then just one item for the header text "Package <result.Query>".
// See searchcode.html for further details.
if len(result.Idents) == 0 {
tocLen++
}
if result.Hit != nil {
if len(result.Hit.Decls) > 0 {
tocLen += len(result.Hit.Decls)
// We need one extra item for the header text "Package-level declarations".
tocLen++
}
if len(result.Hit.Others) > 0 {
tocLen += len(result.Hit.Others)
// We need one extra item for the header text "Local declarations and uses".
tocLen++
}
}
// For "textual occurrences".
tocLen++
return tocLen
}
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