-- Copyright 2006-2023 Mitchell. See LICENSE.
-- Groovy 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('groovy')

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

-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match {
    'abstract', 'break', 'case', 'catch', 'continue', 'default', 'do', 'else',
    'extends', 'final', 'finally', 'for', 'if', 'implements', 'instanceof',
    'native', 'new', 'private', 'protected', 'public', 'return', 'static',
    'switch', 'synchronized', 'throw', 'throws', 'transient', 'try', 'volatile',
    'while', 'strictfp', 'package', 'import', 'as', 'assert', 'def', 'mixin',
    'property', 'test', 'using', 'in', 'false', 'null', 'super', 'this', 'true',
    'it'
}))

-- Functions.
lex:add_rule('function', token(lexer.FUNCTION, word_match {
    'abs', 'any', 'append', 'asList', 'asWritable', 'call', 'collect',
    'compareTo', 'count', 'div', 'dump', 'each', 'eachByte', 'eachFile',
    'eachLine', 'every', 'find', 'findAll', 'flatten', 'getAt', 'getErr',
    'getIn', 'getOut', 'getText', 'grep', 'immutable', 'inject', 'inspect',
    'intersect', 'invokeMethods', 'isCase', 'join', 'leftShift', 'minus',
    'multiply', 'newInputStream', 'newOutputStream', 'newPrintWriter',
    'newReader', 'newWriter', 'next', 'plus', 'pop', 'power', 'previous',
    'print', 'println', 'push', 'putAt', 'read', 'readBytes', 'readLines',
    'reverse', 'reverseEach', 'round', 'size', 'sort', 'splitEachLine', 'step',
    'subMap', 'times', 'toInteger', 'toList', 'tokenize', 'upto',
    'waitForOrKill', 'withPrintWriter', 'withReader', 'withStream',
    'withWriter', 'withWriterAppend', 'write', 'writeLine'
}))

-- Types.
lex:add_rule('type', token(lexer.TYPE, word_match(
                               'boolean byte char class double float int interface long short void')))

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

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

-- Strings.
local sq_str = lexer.range("'")
local dq_str = lexer.range('"')
local tq_str = lexer.range("'''") + lexer.range('"""')
local string = token(lexer.STRING, tq_str + sq_str + dq_str)
local regex_str = lexer.after_set('=~|!<>+-*?&,:;([{', lexer.range('/', true))
local regex = token(lexer.REGEX, regex_str)
lex:add_rule('string', string + regex)

-- 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.OPERATOR, '{', '}')
lex:add_fold_point(lexer.COMMENT, '/*', '*/')

lexer.property['scintillua.comment'] = '//'

return lex
