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-- Copyright 2006-2024 Mitchell. See LICENSE.
-- Haskell LPeg lexer.
-- Modified by Alex Suraci.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, S = lpeg.P, lpeg.S
local lex = lexer.new('haskell', {fold_by_indentation = true})
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
'case', 'class', 'data', 'default', 'deriving', 'do', 'else', 'if', 'import', 'in', 'infix',
'infixl', 'infixr', 'instance', 'let', 'module', 'newtype', 'of', 'then', 'type', 'where', '_',
'as', 'qualified', 'hiding'
}))
-- Types & type constructors.
local word = (lexer.alnum + S("._'#"))^0
local op = lexer.punct - S('()[]{}')
lex:add_rule('type', token(lexer.TYPE, (lexer.upper * word) + (':' * (op^1 - ':'))))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, (lexer.alpha + '_') * word))
-- Strings.
local sq_str = lexer.range("'", true)
local dq_str = lexer.range('"')
lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
-- Comments.
local line_comment = lexer.to_eol('--', true)
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, op))
lexer.property['scintillua.comment'] = '--'
return lex
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