Based on Jason Toy's CLD v1.0.

Based on BanjoInc's CLD v2.0.

Blazing-fast language detection for Ruby provided using Compact Language Detector v2.0

The detect_language method returns a hash with the language name, code, and reliability.

CLD.detect_language("Working as expected")
# => {:name => "ENGLISH", :code => "en", :reliable => true}

CLD.detect_language("plus ça change, plus c'est la même chose")
# => {:name => "FRENCH", :code => "fr", :reliable => true}

Options

You can pass an options hash as the second argument to detect_language:

CLD.detect_language(text, options = {})

Available options:

• :is_plain_text (Boolean, default: true): Set to false if the input text is HTML. CLD2 will then try to skip HTML tags.
• :best_effort (Boolean, default: false): If true, CLD2 will give its best-effort answer, even on short or ambiguous text, instead of potentially returning "Unknown".
• :tld_hint (String, default: nil): A Top-Level Domain hint (e.g., "id", "us") to boost detection accuracy for languages associated with that TLD.
• :content_language_hint (String, default: nil): An HTTP Content-Language header style hint (e.g., "en,fr") to boost detection for the specified languages.
• :score_as_quads (Boolean, default: false): Forces CLD2 to use quadgram-based scoring for certain languages that are normally detected by script alone. This can be a refinement for more meaningful text detection in those languages but depends on CLD2's internal data tables.

Examples with Options:

# Using best_effort for short text
CLD.detect_language("test", best_effort: true)
# => Might return a language like {:name => "ENGLISH", :code => "en", :reliable => false}
#    instead of "Unknown"

# Providing a TLD hint
CLD.detect_language("Ini adalah teks dalam bahasa Indonesia", tld_hint: "id")
# => {:name => "INDONESIAN", :code => "id", :reliable => true}

# Providing a content language hint
CLD.detect_language("Ceci est un texte en français.", content_language_hint: "fr,en")
# => {:name => "FRENCH", :code => "fr", :reliable => true}

# Using score_as_quads (example, effect depends on text and CLD2 tables)
CLD.detect_language("Ελληνικό κείμενο", score_as_quads: true)
# => May provide a more refined result for Greek

Add this line to your application's Gemfile:

gem 'cld2-small', require 'cld'

And then execute:

$ bundle

Thanks to the Chrome authors, and to Mike McCandless for writing a Python version.

Thanks to Jason Toy for the original cld v1.0 ruby port.

Thanks to BanjoInc for cld v2.0 ruby port.

Licensed the same as CLD2Owners.