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Contents
module Rouge
module Lexers
class Prolog < RegexLexer
desc "The Prolog programming language (http://en.wikipedia.org/wiki/Prolog)"
tag 'prolog'
aliases 'prolog'
filenames '*.pro', '*.P', '*.prolog', '*.pl'
mimetypes 'text/x-prolog'
def self.analyze_text(text)
return 0.1 if text =~ /\A\w+(\(\w+\,\s*\w+\))*\./
return 0.1 if text.include? ':-'
end
state :basic do
rule /\s+/, 'Text'
rule /^#.*/, 'Comment.Single'
rule /\/\*/, 'Comment.Multiline', :nested_comment
rule /[\[\](){}|.,;!]/, 'Punctuation'
rule /:-|-->/, 'Punctuation'
rule /"[^"]*"/, 'Literal.String.Double'
rule /\d+\.\d+/, 'Literal.Number.Float'
rule /\d+/, 'Literal.Number'
end
state :atoms do
rule /[[:lower:]]([_[:lower:][:digit:]])*/, 'Literal.String.Symbol'
rule /'[^']*'/, 'Literal.String.Symbol'
end
state :operators do
rule /(<|>|=<|>=|==|=:=|=|\/|\/\/|\*|\+|-)(?=\s|[a-zA-Z0-9\[])/,
'Operator'
rule /is/, 'Operator'
rule /(mod|div|not)/, 'Operator'
rule /[#&*+-.\/:<=>?@^~]+/, 'Operator'
end
state :variables do
rule /[A-Z]+\w*/, 'Name.Variable'
rule /_[[:word:]]*/, 'Name.Variable'
end
state :root do
mixin :basic
mixin :atoms
mixin :variables
mixin :operators
end
state :nested_comment do
rule /\/\*/, 'Comment.Multiline', :push
rule /\s*\*[^*\/]+/, 'Comment.Multiline'
rule /\*\//, 'Comment.Multiline', :pop!
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems