-- Copyright 2020-2021 Christian Hesse. See LICENSE.
-- Mikrotik RouterOS script 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('routeros')

-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))

-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
  -- Control.
  :delay :do on-error while :error :foreach in do :for from to step :if do else
  :return :while do
  -- Menu specific commands.
  add disable edit enable export find get info monitor print append as-value
  brief count-only detail file follow follow-only from interval terse value-list
  where without-paging remove set
  -- Output & string handling.
  :beep :blink :environment :execute :find :len :log alert critical debug
  emergency error info notice warning :parse :pick :put :terminal :time :typeof
  -- Variable declaration.
  :global :local :set
  -- Variable casting.
  :toarray :tobool :toid :toip :toip6 :tonum :tostr :totime
  -- Boolean values and logical operators.
  false no true yes and in or
  -- Networking.
  :ping :resolve
]]))

-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))

-- Comments.
lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#')))

-- Numbers.
lex:add_rule('number', token(lexer.NUMBER, lexer.number))

-- Strings.
lex:add_rule('string', token(lexer.STRING, lexer.range('"')))

-- Variables.
lex:add_rule('variable', token(lexer.VARIABLE, '$' * (S('!#?*@$') +
  lexer.digit^1 + lexer.word + lexer.range('{', '}', true, false, true))))

-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('=!%<>+-/*&|~.,;()[]{}')))

-- Fold points.
lex:add_fold_point(lexer.OPERATOR, '{', '}')
lex:add_fold_point(lexer.COMMENT, lexer.fold_consecutive_lines('#'))

return lex
