47 lines
1.5 KiB
Ruby
47 lines
1.5 KiB
Ruby
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# frozen_string_literal: true
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module Rouge
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module Guessers
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class Modeline < Guesser
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include Util
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# [jneen] regexen stolen from linguist
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EMACS_MODELINE = /-\*-\s*(?:(?!mode)[\w-]+\s*:\s*(?:[\w+-]+)\s*;?\s*)*(?:mode\s*:)?\s*([\w+-]+)\s*(?:;\s*(?!mode)[\w-]+\s*:\s*[\w+-]+\s*)*;?\s*-\*-/i
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# First form vim modeline
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# [text]{white}{vi:|vim:|ex:}[white]{options}
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# ex: 'vim: syntax=ruby'
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VIM_MODELINE_1 = /(?:vim|vi|ex):\s*(?:ft|filetype|syntax)=(\w+)\s?/i
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# Second form vim modeline (compatible with some versions of Vi)
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# [text]{white}{vi:|vim:|Vim:|ex:}[white]se[t] {options}:[text]
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# ex: 'vim set syntax=ruby:'
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VIM_MODELINE_2 = /(?:vim|vi|Vim|ex):\s*se(?:t)?.*\s(?:ft|filetype|syntax)=(\w+)\s?.*:/i
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MODELINES = [EMACS_MODELINE, VIM_MODELINE_1, VIM_MODELINE_2]
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def initialize(source, opts={})
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@source = source
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@lines = opts[:lines] || 5
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end
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def filter(lexers)
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# don't bother reading the stream if we've already decided
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return lexers if lexers.size == 1
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source_text = get_source(@source)
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lines = source_text.split(/\n/)
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search_space = (lines.first(@lines) + lines.last(@lines)).join("\n")
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matches = MODELINES.map { |re| re.match(search_space) }.compact
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return lexers unless matches.any?
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match_set = Set.new(matches.map { |m| m[1] })
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lexers.select { |l| match_set.include?(l.tag) || l.aliases.any? { |a| match_set.include?(a) } }
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end
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end
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end
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end
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