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-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
-- Io LPeg lexer.
local l = require('lexer')
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'io_lang'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local line_comment = (P('#') + '//') * l.nonnewline^0
local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
local comment = token(l.COMMENT, line_comment + block_comment)
-- Strings.
local sq_str = l.delimited_range("'")
local dq_str = l.delimited_range('"')
local tq_str = '"""' * (l.any - '"""')^0 * P('"""')^-1
local string = token(l.STRING, tq_str + sq_str + dq_str)
-- Numbers.
local number = token(l.NUMBER, l.float + l.integer)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'block', 'method', 'while', 'foreach', 'if', 'else', 'do', 'super', 'self',
'clone', 'proto', 'setSlot', 'hasSlot', 'type', 'write', 'print', 'forward'
})
-- Types.
local type = token(l.TYPE, word_match{
'Block', 'Buffer', 'CFunction', 'Date', 'Duration', 'File', 'Future', 'List',
'LinkedList', 'Map', 'Nop', 'Message', 'Nil', 'Number', 'Object', 'String',
'WeakLink'
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S('`~@$%^&*-+/=\\<>?.,:;()[]{}'))
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'type', type},
{'identifier', identifier},
{'string', string},
{'comment', comment},
{'number', number},
{'operator', operator},
}
M._foldsymbols = {
_patterns = {'[%(%)]', '/%*', '%*/', '#', '//'},
[l.OPERATOR] = {['('] = 1, [')'] = -1},
[l.COMMENT] = {
['/*'] = 1, ['*/'] = -1, ['#'] = l.fold_line_comments('#'),
['//'] = l.fold_line_comments('//')
}
}
return M
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