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-- Dart LPeg lexer.
-- Written by Brian Schott (@Hackerpilot on Github).
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 = 'dart'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local line_comment = '//' * l.nonnewline_esc^0
local nested_comment = l.nested_pair('/*', '*/')
local comment = token(l.COMMENT, line_comment + nested_comment)
-- Strings.
local sq_str = S('r')^-1 * l.delimited_range("'", true)
local dq_str = S('r')^-1 * l.delimited_range('"', true)
local sq_str_multiline = S('r')^-1 * l.delimited_range('"""')
local dq_str_multiline = S('r')^-1 * l.delimited_range("''' ")
local string = token(l.STRING,
sq_str + dq_str + sq_str_multiline + dq_str_multiline)
-- Numbers.
local number = token(l.NUMBER, (l.float + l.hex_num))
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'assert', 'break', 'case', 'catch', 'class', 'const', 'continue', 'default',
'do', 'else', 'enum', 'extends', 'false', 'final' , 'finally', 'for', 'if',
'in', 'is', 'new', 'null', 'rethrow', 'return', 'super', 'switch', 'this',
'throw', 'true', 'try', 'var', 'void', 'while', 'with',
})
local builtin_identifiers = token(l.CONSTANT, word_match{
'abstract', 'as', 'dynamic', 'export', 'external', 'factory', 'get',
'implements', 'import', 'library', 'operator', 'part', 'set', 'static',
'typedef'
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S('#?=!<>+-*$/%&|^~.,;()[]{}'))
-- Preprocs.
local annotation = token('annotation', '@' * l.word^1)
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'constant', builtin_identifiers},
{'string', string},
{'identifier', identifier},
{'comment', comment},
{'number', number},
{'operator', operator},
{'annotation', annotation},
}
M._tokenstyles = {
annotation = l.STYLE_PREPROCESSOR,
}
M._foldsymbols = {
_patterns = {'[{}]', '/[*+]', '[*+]/', '//'},
[l.OPERATOR] = {['{'] = 1, ['}'] = -1},
[l.COMMENT] = {
['/*'] = 1, ['*/'] = -1, ['/+'] = 1, ['+/'] = -1,
['//'] = l.fold_line_comments('//')
}
}
return M
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