-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
-- Actionscript LPeg lexer.

local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S

local lex = lexer.new('actionscript')

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

-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
  break continue delete do else for function if in new on return this typeof var
  void while with NaN Infinity false null true undefined
  -- Reserved for future use.
  abstract case catch class const debugger default export extends final finally
  goto implements import instanceof interface native package private Void
  protected public dynamic static super switch synchonized throw throws
  transient try volatile
]]))

-- Types.
lex:add_rule('type', token(lexer.TYPE, word_match[[
  Array Boolean Color Date Function Key MovieClip Math Mouse Number Object
  Selection Sound String XML XMLNode XMLSocket
  -- Reserved for future use.
  boolean byte char double enum float int long short
]]))

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

-- Strings.
local sq_str = lexer.delimited_range("'", true)
local dq_str = lexer.delimited_range('"', true)
local ml_str = '<![CDATA[' * (lexer.any - ']]>')^0 * ']]>'
lex:add_rule('string', token(lexer.STRING, sq_str + dq_str + ml_str))

-- Comments.
local line_comment = '//' * lexer.nonnewline^0
local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))

-- Numbers.
lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
                                           S('LlUuFf')^-2))

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

-- Fold points.
lex:add_fold_point(lexer.OPERATOR, '{', '}')
lex:add_fold_point(lexer.COMMENT, '/*', '*/')
lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
lex:add_fold_point(lexer.STRING, '<![CDATA[', ']]>')

return lex
