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-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
-- Smalltalk 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 = 'smalltalk'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local comment = token(l.COMMENT, l.delimited_range('"', false, true))
-- Strings.
local sq_str = l.delimited_range("'")
local literal = '$' * l.word
local string = token(l.STRING, sq_str + literal)
-- Numbers.
local number = token(l.NUMBER, l.float + l.integer)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'true', 'false', 'nil', 'self', 'super', 'isNil', 'not', 'Smalltalk',
'Transcript'
})
-- Types.
local type = token(l.TYPE, word_match{
'Date', 'Time', 'Boolean', 'True', 'False', 'Character', 'String', 'Array',
'Symbol', 'Integer', 'Object'
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S(':=_<>+-/*!()[]'))
-- Labels.
local label = token(l.LABEL, '#' * l.word)
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'type', type},
{'identifier', identifier},
{'string', string},
{'comment', comment},
{'number', number},
{'label', label},
{'operator', operator},
}
M._foldsymbols = {
_patterns = {'[%[%]]'},
[l.OPERATOR] = {['['] = 1, [']'] = -1}
}
return M
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