176 lines
6.4 KiB
Ruby
176 lines
6.4 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 Go < RegexLexer
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title "Go"
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desc 'The Go programming language (http://golang.org)'
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tag 'go'
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aliases 'go', 'golang'
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filenames '*.go'
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mimetypes 'text/x-go', 'application/x-go'
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# Characters
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WHITE_SPACE = /\s+/
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NEWLINE = /\n/
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UNICODE_CHAR = /[^\n]/
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UNICODE_LETTER = /[[:alpha:]]/
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UNICODE_DIGIT = /[[:digit:]]/
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# Letters and digits
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LETTER = /#{UNICODE_LETTER}|_/
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DECIMAL_DIGIT = /[0-9]/
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OCTAL_DIGIT = /[0-7]/
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HEX_DIGIT = /[0-9A-Fa-f]/
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# Comments
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LINE_COMMENT = /\/\/(?:(?!#{NEWLINE}).)*/
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GENERAL_COMMENT = /\/\*(?:(?!\*\/).)*\*\//m
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COMMENT = /#{LINE_COMMENT}|#{GENERAL_COMMENT}/
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# Keywords
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KEYWORD = /\b(?:
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break | default | func
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| interface | select | case
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| defer | go | map
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| struct | chan | else
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| goto | package | switch
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| const | fallthrough | if
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| range | type | continue
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| for | import | return
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| var
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)\b/x
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# Identifiers
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IDENTIFIER = / (?!#{KEYWORD})
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#{LETTER}(?:#{LETTER}|#{UNICODE_DIGIT})* /x
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# Operators and delimiters
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OPERATOR = / \+= | \+\+ | \+ | &\^= | &\^
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| &= | && | & | == | =
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| \!= | \! | -= | -- | -
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| \|= | \|\| | \| | <= | <-
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| <<= | << | < | \*= | \*
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| \^= | \^ | >>= | >> | >=
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| > | \/ | \/= | := | %
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| %= | \.\.\. | \. | :
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/x
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SEPARATOR = / \( | \) | \[ | \] | \{
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| \} | , | ;
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/x
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# Integer literals
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DECIMAL_LIT = /[0-9]#{DECIMAL_DIGIT}*/
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OCTAL_LIT = /0#{OCTAL_DIGIT}*/
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HEX_LIT = /0[xX]#{HEX_DIGIT}+/
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INT_LIT = /#{HEX_LIT}|#{DECIMAL_LIT}|#{OCTAL_LIT}/
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# Floating-point literals
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DECIMALS = /#{DECIMAL_DIGIT}+/
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EXPONENT = /[eE][+\-]?#{DECIMALS}/
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FLOAT_LIT = / #{DECIMALS} \. #{DECIMALS}? #{EXPONENT}?
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| #{DECIMALS} #{EXPONENT}
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| \. #{DECIMALS} #{EXPONENT}?
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/x
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# Imaginary literals
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IMAGINARY_LIT = /(?:#{DECIMALS}|#{FLOAT_LIT})i/
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# Rune literals
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ESCAPED_CHAR = /\\[abfnrtv\\'"]/
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LITTLE_U_VALUE = /\\u#{HEX_DIGIT}{4}/
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BIG_U_VALUE = /\\U#{HEX_DIGIT}{8}/
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UNICODE_VALUE = / #{UNICODE_CHAR} | #{LITTLE_U_VALUE}
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| #{BIG_U_VALUE} | #{ESCAPED_CHAR}
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/x
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OCTAL_BYTE_VALUE = /\\#{OCTAL_DIGIT}{3}/
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HEX_BYTE_VALUE = /\\x#{HEX_DIGIT}{2}/
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BYTE_VALUE = /#{OCTAL_BYTE_VALUE}|#{HEX_BYTE_VALUE}/
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CHAR_LIT = /'(?:#{UNICODE_VALUE}|#{BYTE_VALUE})'/
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ESCAPE_SEQUENCE = / #{ESCAPED_CHAR}
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| #{LITTLE_U_VALUE}
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| #{BIG_U_VALUE}
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| #{HEX_BYTE_VALUE}
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/x
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# String literals
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RAW_STRING_LIT = /`(?:#{UNICODE_CHAR}|#{NEWLINE})*`/
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INTERPRETED_STRING_LIT = / "(?: (?!")
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(?: #{UNICODE_VALUE} | #{BYTE_VALUE} )
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)*" /x
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STRING_LIT = /#{RAW_STRING_LIT}|#{INTERPRETED_STRING_LIT}/
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# Predeclared identifiers
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PREDECLARED_TYPES = /\b(?:
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bool | byte | complex64
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| complex128 | error | float32
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| float64 | int8 | int16
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| int32 | int64 | int
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| rune | string | uint8
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| uint16 | uint32 | uint64
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| uintptr | uint
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)\b/x
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PREDECLARED_CONSTANTS = /\b(?:true|false|iota|nil)\b/
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PREDECLARED_FUNCTIONS = /\b(?:
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append | cap | close | complex
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| copy | delete | imag | len
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| make | new | panic | print
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| println | real | recover
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)\b/x
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state :simple_tokens do
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rule(COMMENT, Comment)
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rule(KEYWORD, Keyword)
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rule(PREDECLARED_TYPES, Keyword::Type)
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rule(PREDECLARED_FUNCTIONS, Name::Builtin)
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rule(PREDECLARED_CONSTANTS, Name::Constant)
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rule(IMAGINARY_LIT, Num)
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rule(FLOAT_LIT, Num)
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rule(INT_LIT, Num)
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rule(CHAR_LIT, Str::Char)
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rule(OPERATOR, Operator)
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rule(SEPARATOR, Punctuation)
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rule(IDENTIFIER, Name)
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rule(WHITE_SPACE, Text)
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end
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state :root do
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mixin :simple_tokens
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rule(/`/, Str, :raw_string)
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rule(/"/, Str, :interpreted_string)
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end
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state :interpreted_string do
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rule(ESCAPE_SEQUENCE, Str::Escape)
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rule(/\\./, Error)
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rule(/"/, Str, :pop!)
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rule(/[^"\\]+/, Str)
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end
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state :raw_string do
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rule(/`/, Str, :pop!)
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rule(/[^`]+/m, Str)
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end
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end
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end
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end
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