144 lines
4.1 KiB
Ruby
144 lines
4.1 KiB
Ruby
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# -*- coding: utf-8 #
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# frozen_string_literal: true
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module Rouge
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module Lexers
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class Scala < RegexLexer
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title "Scala"
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desc "The Scala programming language (scala-lang.org)"
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tag 'scala'
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aliases 'scala'
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filenames '*.scala', '*.sbt'
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mimetypes 'text/x-scala', 'application/x-scala'
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# As documented in the ENBF section of the scala specification
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# http://www.scala-lang.org/docu/files/ScalaReference.pdf
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whitespace = /\p{Space}/
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letter = /[\p{L}$_]/
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upper = /[\p{Lu}$_]/
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digits = /[0-9]/
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parens = /[(){}\[\]]/
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delims = %r([‘’".;,])
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# negative lookahead to filter out other classes
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op = %r(
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(?!#{whitespace}|#{letter}|#{digits}|#{parens}|#{delims})
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[\u0020-\u007F\p{Sm}\p{So}]
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)x
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idrest = %r(#{letter}(?:#{letter}|#{digits})*(?:(?<=_)#{op}+)?)x
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keywords = %w(
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abstract case catch def do else extends final finally for forSome
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if implicit lazy match new override private protected requires return
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sealed super this throw try val var while with yield
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)
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state :root do
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rule /(class|trait|object)(\s+)/ do
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groups Keyword, Text
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push :class
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end
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rule /'#{idrest}[^']/, Str::Symbol
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rule /[^\S\n]+/, Text
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rule %r(//.*?\n), Comment::Single
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rule %r(/\*), Comment::Multiline, :comment
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rule /@#{idrest}/, Name::Decorator
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rule %r(
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(#{keywords.join("|")})\b|
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(<[%:-]|=>|>:|[#=@_\u21D2\u2190])(\b|(?=\s)|$)
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)x, Keyword
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rule /:(?!#{op})/, Keyword, :type
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rule /#{upper}#{idrest}\b/, Name::Class
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rule /(true|false|null)\b/, Keyword::Constant
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rule /(import|package)(\s+)/ do
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groups Keyword, Text
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push :import
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end
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rule /(type)(\s+)/ do
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groups Keyword, Text
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push :type
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end
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rule /""".*?"""(?!")/m, Str
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rule /"(\\\\|\\"|[^"])*"/, Str
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rule /'\\.'|'[^\\]'|'\\u[0-9a-fA-F]{4}'/, Str::Char
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rule idrest, Name
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rule /`[^`]+`/, Name
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rule /\[/, Operator, :typeparam
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rule /[\(\)\{\};,.#]/, Operator
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rule /#{op}+/, Operator
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rule /([0-9][0-9]*\.[0-9]*|\.[0-9]+)([eE][+-]?[0-9]+)?[fFdD]?/, Num::Float
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rule /([0-9][0-9]*[fFdD])/, Num::Float
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rule /0x[0-9a-fA-F]+/, Num::Hex
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rule /[0-9]+L?/, Num::Integer
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rule /\n/, Text
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end
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state :class do
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rule /(#{idrest}|#{op}+|`[^`]+`)(\s*)(\[)/ do
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groups Name::Class, Text, Operator
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push :typeparam
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end
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rule /\s+/, Text
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rule /{/, Operator, :pop!
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rule /\(/, Operator, :pop!
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rule %r(//.*?\n), Comment::Single, :pop!
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rule %r(#{idrest}|#{op}+|`[^`]+`), Name::Class, :pop!
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end
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state :type do
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rule /\s+/, Text
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rule /<[%:]|>:|[#_\u21D2]|forSome|type/, Keyword
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rule /([,\);}]|=>|=)(\s*)/ do
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groups Operator, Text
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pop!
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end
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rule /[\(\{]/, Operator, :type
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typechunk = /(?:#{idrest}|#{op}+\`[^`]+`)/
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rule /(#{typechunk}(?:\.#{typechunk})*)(\s*)(\[)/ do
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groups Keyword::Type, Text, Operator
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pop!
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push :typeparam
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end
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rule /(#{typechunk}(?:\.#{typechunk})*)(\s*)$/ do
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groups Keyword::Type, Text
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pop!
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end
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rule %r(//.*?\n), Comment::Single, :pop!
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rule /\.|#{idrest}|#{op}+|`[^`]+`/, Keyword::Type
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end
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state :typeparam do
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rule /[\s,]+/, Text
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rule /<[%:]|=>|>:|[#_\u21D2]|forSome|type/, Keyword
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rule /([\]\)\}])/, Operator, :pop!
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rule /[\(\[\{]/, Operator, :typeparam
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rule /\.|#{idrest}|#{op}+|`[^`]+`/, Keyword::Type
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end
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state :comment do
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rule %r([^/\*]+), Comment::Multiline
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rule %r(/\*), Comment::Multiline, :comment
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rule %r(\*/), Comment::Multiline, :pop!
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rule %r([*/]), Comment::Multiline
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end
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state :import do
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rule %r((#{idrest}|\.)+), Name::Namespace, :pop!
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end
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end
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end
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end
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