Add google translate vocabulary

extra/google/translate/authors.txt

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+Doug Coleman

extra/google/translate/translate.factor

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+! Copyright (C) 2010 Doug Coleman.
+! See http://factorcode.org/license.txt for BSD license.
+USING: assocs combinators fry grouping http.client io
+json.reader kernel locals namespaces sequences ;
+IN: google.translate
+
+CONSTANT: google-translate-url "http://ajax.googleapis.com/ajax/services/language/translate"
+
+CONSTANT: maximum-translation-size 5120
+
+: parameters>assoc ( text from to -- assoc )
+    "|" glue [
+        [ "q" set ] [ "langpair" set ] bi*
+        "1.0" "v" set
+    ] { } make-assoc ;
+
+: assoc>query-response ( assoc -- response )
+    google-translate-url http-post nip ;
+
+ERROR: response-error response error ;
+
+: throw-response-error ( response -- * )
+    "responseDetails" over at response-error ;
+
+: check-response ( response -- response )
+    "responseStatus" over at {
+        { 200 [ ] }
+        { 400 [ throw-response-error ] }
+        [ drop throw-response-error ]
+    } case ;
+
+: query-response>text ( response -- text )
+    json> check-response
+    "responseData" swap at
+    "translatedText" swap at ;
+
+: (translate) ( text from to -- text' )
+    parameters>assoc
+    assoc>query-response
+    query-response>text ;
+
+: translate ( text from to -- text' )
+    [ maximum-translation-size group ] 2dip
+    '[ _ _ (translate) ] map concat ;
+
+:: translation-party ( text source target -- )
+    text dup print [
+        dup source target translate dup print
+        target source translate dup print
+        swap dupd = not
+    ] loop drop ;
+
+! Example:
+! "dog" "en" "de" translate .
+! "Hund"