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search.go
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search.go
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package imdb
import (
"fmt"
"net/url"
"regexp"
"strconv"
"strings"
"github.com/jbowtie/gokogiri/xml"
)
// SearchQuery represents a query for items (shows, series or episodes)
type SearchQuery struct {
Query string
Year int
Category ItemType
Exact bool
}
// paremeters returns the IMDB URL parameters for the search
func (s *SearchQuery) parameters() *url.Values {
parameters := &url.Values{}
if s.Year != 0 {
parameters.Set("q", fmt.Sprintf("%s (%d)", s.Query, s.Year))
} else {
parameters.Set("q", s.Query)
}
if s.Exact {
parameters.Set("exact", "true")
}
if s.Category != Unknown {
parameters.Set("s", "tt")
switch s.Category {
case Movie:
parameters.Set("ttype", "ft")
case Series:
parameters.Set("ttype", "tv")
case Episode:
parameters.Set("ttype", "ep")
}
}
return parameters
}
// encode returns a GET request parameter string
func (s *SearchQuery) encode() string {
return s.parameters().Encode()
}
// Search executes the query
func Search(query *SearchQuery) ([]*Item, error) {
return SearchWithClient(query, nil)
}
// SearchWithClient executes the query using the given HTTP client to communicate
// with IMDB.
func SearchWithClient(query *SearchQuery, client HttpGetter) ([]*Item, error) {
searchPage, err := parsePage(client, fmt.Sprintf(
"http://akas.imdb.com/find?%s", query.encode(),
))
if err != nil {
return nil, fmt.Errorf("unable to parse search page: %s", err)
}
rows, err := searchPage.Search(
`//table[contains(@class, 'findList')]//tr[contains(@class, 'findResult')]`,
)
if err != nil {
return nil, fmt.Errorf("unable to find search results: %s", err)
}
var items []*Item
for i := range rows {
item, err := parseSearchResult(rows[i])
if err != nil {
return nil, fmt.Errorf("unable to parse search result: %s", err)
}
if item != nil {
if query.Category != Any {
item.itemType = query.Category
}
items = append(items, item)
}
}
return items, nil
}
func parseSearchResult(row xml.Node) (*Item, error) {
textElements, err := row.Search("td[@class='result_text']")
if err != nil {
return nil, fmt.Errorf("unable to find result text: %s", err)
}
if len(textElements) < 1 {
return nil, fmt.Errorf("no result text")
}
id, err := getSearchResultID(textElements[0])
if err != nil {
return nil, err
}
if id == 0 {
return nil, nil
}
if len(textElements[0].Content()) == 0 {
return nil, nil
}
groups := regexp.MustCompile(
`(.+)[\s]+\(([0-9]+)\)[\s]*`,
).FindStringSubmatch(
textElements[0].Content(),
)
if len(groups) < 3 {
return nil, fmt.Errorf(
"unable to parse result line (%s)", textElements[0].Content(),
)
}
title := strings.Trim(groups[1], " \r\t\n")
year, err := strconv.Atoi(groups[2])
if err != nil {
return nil, fmt.Errorf("unable to parse year (%s): %s", groups[3], err)
}
item := New(id)
item.title = &title
item.year = &year
return item, nil
}
func getSearchResultID(resultTextElement xml.Node) (int, error) {
linkElements, err := resultTextElement.Search("a")
if err != nil {
return 0, fmt.Errorf("unable to find result link: %s", err)
}
if len(linkElements) < 1 {
return 0, fmt.Errorf("no result link")
}
href := linkElements[0].Attribute("href")
if href == nil {
return 0, fmt.Errorf("malformed result link")
}
if !strings.Contains(href.String(), "/title/tt") {
return 0, nil // not a valid search result
}
return idFromLink(href.String())
}