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# A completion engine provides search suggestions for a search engine. A search engine is identified by a
# "searchUrl", e.g. Settings.get("searchUrl"), or a custom search engine.
#
# Each completion engine defines three functions:
#
# 1. "match" - This takes a searchUrl and returns a boolean indicating whether this completion engine can
# perform completion for the given search engine.
#
# 2. "getUrl" - This takes a list of query terms (queryTerms) and generates a completion URL, that is, a URL
# which will provide completions for this completion engine.
#
# 3. "parse" - This takes a successful XMLHttpRequest object (the request has completed successfully), and
# returns a list of suggestions (a list of strings). This method is always executed within the context
# of a try/catch block, so errors do not propagate.
#
# Each new completion engine must be add to the list "CompletionEngines" at the bottom of this file.
#
# The lookup logic which uses these completion engines is in "./completion_search.coffee".
#
# A base class for common regexp-based matching engines.
class RegexpEngine
constructor: (@regexps) ->
match: (searchUrl) -> Utils.matchesAnyRegexp @regexps, searchUrl
# Several Google completion engines package XML responses in this way.
class GoogleXMLRegexpEngine extends RegexpEngine
doNotCache: false # true (disbaled, experimental)
parse: (xhr) ->
for suggestion in xhr.responseXML.getElementsByTagName "suggestion"
continue unless suggestion = suggestion.getAttribute "data"
suggestion
class Google extends GoogleXMLRegexpEngine
# Example search URL: http://www.google.com/search?q=%s
constructor: ->
super [
# We match the major English-speaking TLDs.
new RegExp "^https?://[a-z]+\.google\.(com|ie|co\.uk|ca|com\.au)/"
new RegExp "localhost/cgi-bin/booky" # Only for smblott.
]
getUrl: (queryTerms) ->
"http://suggestqueries.google.com/complete/search?ss_protocol=legace&client=toolbar&q=#{Utils.createSearchQuery queryTerms}"
class Youtube extends GoogleXMLRegexpEngine
# Example search URL: http://www.youtube.com/results?search_query=%s
constructor: ->
super [ new RegExp "^https?://[a-z]+\.youtube\.com/results" ]
getUrl: (queryTerms) ->
"http://suggestqueries.google.com/complete/search?client=youtube&ds=yt&xml=t&q=#{Utils.createSearchQuery queryTerms}"
class Wikipedia extends RegexpEngine
doNotCache: false # true (disbaled, experimental)
# Example search URL: http://www.wikipedia.org/w/index.php?title=Special:Search&search=%s
constructor: ->
super [ new RegExp "^https?://[a-z]+\.wikipedia\.org/" ]
getUrl: (queryTerms) ->
"https://en.wikipedia.org/w/api.php?action=opensearch&format=json&search=#{Utils.createSearchQuery queryTerms}"
parse: (xhr) ->
JSON.parse(xhr.responseText)[1]
## Does not work...
## class GoogleMaps extends RegexpEngine
## # Example search URL: https://www.google.com/maps/search/%s
## constructor: ->
## super [ new RegExp "^https?://www\.google\.com/maps/search/" ]
##
## getUrl: (queryTerms) ->
## "https://www.google.com/s?tbm=map&fp=1&gs_ri=maps&source=hp&suggest=p&authuser=0&hl=en&pf=p&tch=1&ech=2&q=#{Utils.createSearchQuery queryTerms}"
##
## parse: (xhr) ->
## data = JSON.parse xhr.responseText
## []
class Bing extends RegexpEngine
# Example search URL: https://www.bing.com/search?q=%s
constructor: -> super [ new RegExp "^https?://www\.bing\.com/search" ]
getUrl: (queryTerms) -> "http://api.bing.com/osjson.aspx?query=#{Utils.createSearchQuery queryTerms}"
parse: (xhr) -> JSON.parse(xhr.responseText)[1]
class Amazon extends RegexpEngine
# Example search URL: http://www.amazon.com/s/?field-keywords=%s
constructor: -> super [ new RegExp "^https?://www\.amazon\.(com|co.uk|ca|com.au)/s/" ]
getUrl: (queryTerms) -> "https://completion.amazon.com/search/complete?method=completion&search-alias=aps&client=amazon-search-ui&mkt=1&q=#{Utils.createSearchQuery queryTerms}"
parse: (xhr) -> JSON.parse(xhr.responseText)[1]
class DuckDuckGo extends RegexpEngine
# Example search URL: https://duckduckgo.com/?q=%s
constructor: -> super [ new RegExp "^https?://([a-z]+\.)?duckduckgo\.com/" ]
getUrl: (queryTerms) -> "https://duckduckgo.com/ac/?q=#{Utils.createSearchQuery queryTerms}"
parse: (xhr) ->
suggestion.phrase for suggestion in JSON.parse xhr.responseText
# A dummy search engine which is guaranteed to match any search URL, but never produces completions. This
# allows the rest of the logic to be written knowing that there will always be a completion engine match.
class DummyCompletionEngine
dummy: true
match: -> true
# We return a useless URL which we know will succeed, but which won't generate any network traffic.
getUrl: -> chrome.runtime.getURL "content_scripts/vimium.css"
parse: -> []
# Note: Order matters here.
CompletionEngines = [
Youtube
Google
DuckDuckGo
Wikipedia
Bing
Amazon
DummyCompletionEngine
]
root = exports ? window
root.CompletionEngines = CompletionEngines
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