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-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
-- R 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 = 'rstats'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local comment = token(l.COMMENT, '#' * l.nonnewline^0)
-- Strings.
local sq_str = l.delimited_range("'", true)
local dq_str = l.delimited_range('"', true)
local string = token(l.STRING, sq_str + dq_str)
-- Numbers.
local number = token(l.NUMBER, (l.float + l.integer) * P('i')^-1)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'break', 'else', 'for', 'if', 'in', 'next', 'repeat', 'return', 'switch',
'try', 'while', 'Inf', 'NA', 'NaN', 'NULL', 'FALSE', 'TRUE'
})
-- Types.
local type = token(l.TYPE, word_match{
'array', 'character', 'complex', 'data.frame', 'double', 'factor', 'function',
'integer', 'list', 'logical', 'matrix', 'numeric', 'vector'
})
-- 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},
}
return M
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