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-- Copyright 2006-2020 Mitchell mitchell.att.foicica.com. See License.txt.
-- R LPeg lexer.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, S = lpeg.P, lpeg.S
local lex = lexer.new('rstats')
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
break else for if in next repeat return switch try while
Inf NA NaN NULL FALSE TRUE
]]))
-- Types.
lex:add_rule('type', token(lexer.TYPE, word_match[[
array character complex data.frame double factor function integer list logical
matrix numeric vector
]]))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
-- Strings.
local sq_str = lexer.range("'", true)
local dq_str = lexer.range('"', true)
lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
-- Comments.
lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#')))
-- Numbers.
lex:add_rule('number', token(lexer.NUMBER, lexer.number * P('i')^-1))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('<->+*/^=.,:;|$()[]{}')))
return lex
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