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module Linguist
module Strategy
# Detects XML files based on root tag.
class XML
# Scope of the search for the root tag
# Number of lines to check at the beginning of the file
SEARCH_SCOPE = 2
# Public: Use the root tag to detect the XML blobs, only if no other
# candidates were previously identified.
#
# blob - An object that quacks like a blob.
# candidates - A list of candidate languages.
#
# Examples
#
# XML.call(FileBlob.new("path/to/file"))
#
# Returns the list of candidates if it wasn't empty, an array with the
# XML language as sole item if the root tag is detected, and an empty
# Array otherwise.
def self.call(blob, candidates = [])
return candidates if candidates.any?
header = blob.first_lines(SEARCH_SCOPE).join("\n")
/<?xml version=/.match(header) ? [Language["XML"]] : []
end
end
end
end
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