rstats.lua (1609B)
- -- Copyright 2006-2024 Mitchell. See LICENSE.
- -- 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', 'F', 'T',
- -- Frequently used operators.
- '|>', '%%', '%*%', '%/%', '%in%', '%o%', '%x%'
- }))
- -- Types.
- lex:add_rule('type', token(lexer.TYPE, word_match{
- 'array', 'character', 'closure', 'complex', 'data.frame', 'double', 'environment', 'expression',
- 'externalptr', 'factor', 'function', 'integer', 'list', 'logical', 'matrix', 'numeric',
- 'pairlist', 'promise', 'raw', 'symbol', '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) * P('L')^-1))
- -- Operators.
- lex:add_rule('operator', token(lexer.OPERATOR, S('<->+*/^=.,:;|$()[]{}')))
- -- Folding
- lex:add_fold_point(lexer.OPERATOR, '(', ')')
- lex:add_fold_point(lexer.OPERATOR, '[', ']')
- lex:add_fold_point(lexer.OPERATOR, '{', '}')
- lexer.property['scintillua.comment'] = '#'
- return lex