62 lines
2.0 KiB
Lua
Executable File
62 lines
2.0 KiB
Lua
Executable File
-- Copyright 2006-2019 JMS. See License.txt.
|
|
-- Scala 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('scala')
|
|
|
|
-- Whitespace.
|
|
local ws = token(lexer.WHITESPACE, lexer.space^1)
|
|
lex:add_rule('whitespace', ws)
|
|
|
|
-- Classes.
|
|
lex:add_rule('class', token(lexer.KEYWORD, P('class')) * ws^1 *
|
|
token(lexer.CLASS, lexer.word))
|
|
|
|
-- Keywords.
|
|
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
|
|
abstract case catch class def do else extends false final finally for forSome
|
|
if implicit import lazy match new null object override package private
|
|
protected return sealed super this throw trait try true type val var while
|
|
with yield
|
|
]]))
|
|
|
|
-- Types.
|
|
lex:add_rule('type', token(lexer.TYPE, word_match[[
|
|
Array Boolean Buffer Byte Char Collection Double Float Int Iterator LinkedList
|
|
List Long Map None Option Set Short SortedMap SortedSet String TreeMap TreeSet
|
|
]]))
|
|
|
|
-- Functions.
|
|
lex:add_rule('function', token(lexer.FUNCTION, lexer.word) * #P('('))
|
|
|
|
-- Identifiers.
|
|
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
|
|
|
|
-- Strings.
|
|
local symbol = "'" * lexer.word
|
|
local dq_str = lexer.delimited_range('"', true)
|
|
local tq_str = '"""' * (lexer.any - '"""')^0 * P('"""')^-1
|
|
lex:add_rule('string', token(lexer.STRING, tq_str + symbol + dq_str))
|
|
|
|
-- Comments.
|
|
local line_comment = '//' * lexer.nonnewline_esc^0
|
|
local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
|
|
lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
|
|
|
|
-- Numbers.
|
|
lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
|
|
S('LlFfDd')^-1))
|
|
|
|
-- Operators.
|
|
lex:add_rule('operator', token(lexer.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}')))
|
|
|
|
-- Fold points.
|
|
lex:add_fold_point(lexer.OPERATOR, '{', '}')
|
|
lex:add_fold_point(lexer.COMMENT, '/*', '*/')
|
|
lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
|
|
|
|
return lex
|