-- Copyright 2006-2021 Mitchell. See LICENSE.
-- Applescript 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('applescript')

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

-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
  script property prop end copy to set global local on to of in given with
  without return continue tell if then else repeat times while until from exit
  try error considering ignoring timeout transaction my get put into is
  -- References.
  each some every whose where id index first second third fourth fifth sixth
  seventh eighth ninth tenth last front back st nd rd th middle named through
  thru before after beginning the
  -- Commands.
  close copy count delete duplicate exists launch make move open print quit
  reopen run save saving
  -- Operators.
  div mod and not or as contains equal equals isn't
]], true))

-- Constants.
lex:add_rule('constant', token(lexer.CONSTANT, word_match[[
  case diacriticals expansion hyphens punctuation
  -- Predefined variables.
  it me version pi result space tab anything
  -- Text styles.
  bold condensed expanded hidden italic outline plain shadow strikethrough
  subscript superscript underline
  -- Save options.
  ask no yes
  -- Booleans.
  false true
  -- Date and time.
  weekday monday mon tuesday tue wednesday wed thursday thu friday fri saturday
  sat sunday sun month january jan february feb march mar april apr may june jun
  july jul august aug september sep october oct november nov december dec
  minutes hours days weeks
]], true))

-- Identifiers.
local word = lexer.alpha * (lexer.alnum + '_')^0
lex:add_rule('identifier', token(lexer.IDENTIFIER, word))

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

-- Comments.
local line_comment = lexer.to_eol('--')
local block_comment = lexer.range('(*', '*)')
lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))

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

-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('+-^*/&<>=:,(){}')))

-- Fold points.
lex:add_fold_point(lexer.COMMENT, '(*', '*)')

return lex
