58 lines
1.8 KiB
Lua
Executable File
58 lines
1.8 KiB
Lua
Executable File
-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
|
|
-- ANTLR LPeg lexer.
|
|
|
|
local lexer = require('lexer')
|
|
local token, word_match = lexer.token, lexer.word_match
|
|
local P, R, S = lpeg.P, lpeg.R, lpeg.S
|
|
|
|
local lex = lexer.new('antlr')
|
|
|
|
-- Whitespace.
|
|
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
|
|
|
|
-- Keywords.
|
|
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
|
|
abstract break case catch continue default do else extends final finally for
|
|
if implements instanceof native new private protected public return static
|
|
switch synchronized throw throws transient try volatile
|
|
while package import header options tokens strictfp
|
|
false null super this true
|
|
]]))
|
|
|
|
-- Types.
|
|
lex:add_rule('type', token(lexer.TYPE, word_match[[
|
|
boolean byte char class double float int interface long short void
|
|
]]))
|
|
|
|
-- Functions.
|
|
lex:add_rule('func', token(lexer.FUNCTION, 'assert'))
|
|
|
|
-- Identifiers.
|
|
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
|
|
|
|
-- Comments.
|
|
local line_comment = '//' * lexer.nonnewline^0
|
|
local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
|
|
lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
|
|
|
|
-- Actions.
|
|
lex:add_rule('action', token(lexer.OPERATOR, P('{')) *
|
|
token('action', (1 - P('}'))^0) *
|
|
token(lexer.OPERATOR, P('}'))^-1)
|
|
lex:add_style('action', lexer.STYLE_NOTHING)
|
|
|
|
-- Strings.
|
|
lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'", true)))
|
|
|
|
-- Operators.
|
|
lex:add_rule('operator', token(lexer.OPERATOR, S('$@:;|.=+*?~!^>-()[]{}')))
|
|
|
|
-- Fold points.
|
|
lex:add_fold_point(lexer.OPERATOR, ':', ';')
|
|
lex:add_fold_point(lexer.OPERATOR, '(', ')')
|
|
lex:add_fold_point(lexer.OPERATOR, '{', '}')
|
|
lex:add_fold_point(lexer.COMMENT, '/*', '*/')
|
|
lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
|
|
|
|
return lex
|