-- Copyright 2006-2018 Robert Gieseke. See License.txt.
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-- Literate CoffeeScript LPeg lexer.
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-- http://coffeescript.org/#literate
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local lexer = require('lexer')
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local token = lexer.token
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local P, S = lpeg.P, lpeg.S
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local lex = lexer.new('litcoffee', {inherit = lexer.load('markdown')})
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-- Embedded CoffeeScript.
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local coffeescript = lexer.load('coffeescript')
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local coffee_start_rule = token(lexer.STYLE_EMBEDDED, (P(' ')^4 + P('\t')))
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local coffee_end_rule = token(lexer.STYLE_EMBEDDED, lexer.newline)
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lex:embed(coffeescript, coffee_start_rule, coffee_end_rule)
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-- Use 'markdown_whitespace' instead of lexer.WHITESPACE since the latter would
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-- expand to 'litcoffee_whitespace'.
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lex:modify_rule('whitespace', token('markdown_whitespace', S(' \t')^1 +
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S('\r\n')^1))
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return lex
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