52 lines
1.6 KiB
Lua
52 lines
1.6 KiB
Lua
|
-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
|
||
|
|
-- Io 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('io_lang')
|
||
|
|
|
||
|
|
-- Whitespace.
|
||
|
|
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
|
||
|
|
|
||
|
|
-- Keywords.
|
||
|
|
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
|
||
|
|
block method while foreach if else do super self clone proto setSlot hasSlot
|
||
|
|
type write print forward
|
||
|
|
]]))
|
||
|
|
|
||
|
|
-- Types.
|
||
|
|
lex:add_rule('type', token(lexer.TYPE, word_match[[
|
||
|
|
Block Buffer CFunction Date Duration File Future LinkedList List Map Message
|
||
|
|
Nil Nop Number Object String WeakLink
|
||
|
|
]]))
|
||
|
|
|
||
|
|
-- Identifiers.
|
||
|
|
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
|
||
|
|
|
||
|
|
-- Strings.
|
||
|
|
local sq_str = lexer.delimited_range("'")
|
||
|
|
local dq_str = lexer.delimited_range('"')
|
||
|
|
local tq_str = '"""' * (lexer.any - '"""')^0 * P('"""')^-1
|
||
|
|
lex:add_rule('string', token(lexer.STRING, tq_str + sq_str + dq_str))
|
||
|
|
|
||
|
|
-- Comments.
|
||
|
|
local line_comment = (P('#') + '//') * lexer.nonnewline^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))
|
||
|
|
|
||
|
|
-- 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
|