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-- Copyright 2006-2020 Mitchell mitchell.att.foicica.com. See License.txt.
-- Gap 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('gap')
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
and break continue do elif else end fail false fi for function if in infinity
local not od or rec repeat return then true until while
]]))
-- 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.dec_num * -lexer.alpha))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('*+-,./:;<=>~^#()[]{}')))
-- Fold points.
lex:add_fold_point(lexer.KEYWORD, 'function', 'end')
lex:add_fold_point(lexer.KEYWORD, 'do', 'od')
lex:add_fold_point(lexer.KEYWORD, 'if', 'fi')
lex:add_fold_point(lexer.KEYWORD, 'repeat', 'until')
lex:add_fold_point(lexer.COMMENT, lexer.fold_consecutive_lines('#'))
return lex
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