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-- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
-- LPeg lexer for the Icon programming language.
-- http://www.cs.arizona.edu/icon
-- Contributed by Carl Sturtivant.
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 = 'icon'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
--Comments
local line_comment = '#' * l.nonnewline_esc^0
local comment = token(l.COMMENT, line_comment)
-- Strings.
local cset = l.delimited_range("'")
local str = l.delimited_range('"')
local string = token(l.STRING, cset + str)
-- Numbers.
local radix_literal = P('-')^-1 * l.dec_num * S('rR') * l.alnum^1
local number = token(l.NUMBER, radix_literal + l.float + l.integer)
-- Preprocessor.
local preproc_word = word_match{
'include', 'line', 'define', 'undef', 'ifdef', 'ifndef', 'else', 'endif',
'error'
}
local preproc = token(l.PREPROCESSOR, S(' \t')^0 * P('$') * preproc_word)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'break', 'by', 'case', 'create', 'default', 'do', 'else', 'end', 'every',
'fail', 'global', 'if', 'initial', 'invocable', 'link', 'local', 'next',
'not', 'of', 'procedure', 'record', 'repeat', 'return', 'static', 'suspend',
'then', 'to', 'until', 'while'
})
-- Icon Keywords: unique to Icon; use l.TYPE, as Icon is dynamically typed
local type = token(l.TYPE, P('&') * word_match{
'allocated', 'ascii', 'clock', 'collections', 'cset', 'current', 'date',
'dateline', 'digits', 'dump', 'e', 'error', 'errornumber', 'errortext',
'errorvalue', 'errout', 'fail', 'features', 'file', 'host', 'input', 'lcase',
'letters', 'level', 'line', 'main', 'null', 'output', 'phi', 'pi', 'pos',
'progname', 'random', 'regions', 'source', 'storage', 'subject', 'time',
'trace', 'ucase', 'version'
})
-- 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},
{'comment', comment},
{'string', string},
{'number', number},
{'preproc', preproc},
{'operator', operator},
}
M._foldsymbols = {
_patterns = {'%l+', '#'},
[l.PREPROCESSOR] = {ifdef = 1, ifndef = 1, endif = -1},
[l.KEYWORD] = { procedure = 1, ['end'] = -1},
[l.COMMENT] = {['#'] = l.fold_line_comments('#')}
}
return M
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