67 lines
2.2 KiB
Lua
67 lines
2.2 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Java LPeg lexer.
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-- Modified by Brian Schott.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('java')
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-- Whitespace.
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local ws = token(lexer.WHITESPACE, lexer.space^1)
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lex:add_rule('whitespace', ws)
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-- Classes.
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lex:add_rule('classdef', token(lexer.KEYWORD, P('class')) * ws *
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token(lexer.CLASS, lexer.word))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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abstract assert break case catch class const continue default do else enum
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extends final finally for goto if implements import instanceof interface
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native new package private protected public return static strictfp super
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switch synchronized this throw throws transient try while volatile
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-- Literals.
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true false null
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]]))
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-- Types.
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lex:add_rule('type', token(lexer.TYPE, word_match[[
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boolean byte char double float int long short void
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Boolean Byte Character Double Float Integer Long Short String
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]]))
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-- Functions.
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lex:add_rule('function', token(lexer.FUNCTION, lexer.word) * #P('('))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Strings.
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lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'", true) +
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lexer.delimited_range('"', true)))
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-- Comments.
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local line_comment = '//' * lexer.nonnewline_esc^0
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local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
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lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
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S('LlFfDd')^-1))
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-- Annotations.
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lex:add_rule('annotation', token('annotation', '@' * lexer.word))
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lex:add_style('annotation', lexer.STYLE_PREPROCESSOR)
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}')))
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-- Fold points.
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lex:add_fold_point(lexer.OPERATOR, '{', '}')
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lex:add_fold_point(lexer.COMMENT, '/*', '*/')
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lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
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return lex
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