-- Copyright 2015-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Contributed by Richard Philips.
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-- Elixir LPeg lexer.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local B, P, R, S = lpeg.B, lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('elixir', {fold_by_indentation = true})
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Sigils.
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local sigil11 = P("~") * S("CRSW") * lexer.delimited_range('<>', false, true)
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local sigil12 = P("~") * S("CRSW") * lexer.delimited_range('{}', false, true)
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local sigil13 = P("~") * S("CRSW") * lexer.delimited_range('[]', false, true)
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local sigil14 = P("~") * S("CRSW") * lexer.delimited_range('()', false, true)
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local sigil15 = P("~") * S("CRSW") * lexer.delimited_range('|', false, true)
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local sigil16 = P("~") * S("CRSW") * lexer.delimited_range('/', false, true)
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local sigil17 = P("~") * S("CRSW") * lexer.delimited_range('"', false, true)
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local sigil18 = P("~") * S("CRSW") * lexer.delimited_range("'", false, true)
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local sigil19 = P("~") * S("CRSW") * '"""' * (lexer.any - '"""')^0 * P('"""')^-1
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local sigil10 = P("~") * S("CRSW") * "'''" * (lexer.any - "'''")^0 * P("'''")^-1
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local sigil21 = P("~") * S("crsw") * lexer.delimited_range('<>', false, false)
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local sigil22 = P("~") * S("crsw") * lexer.delimited_range('{}', false, false)
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local sigil23 = P("~") * S("crsw") * lexer.delimited_range('[]', false, false)
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local sigil24 = P("~") * S("crsw") * lexer.delimited_range('()', false, false)
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local sigil25 = P("~") * S("crsw") * lexer.delimited_range('|', false, false)
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local sigil26 = P("~") * S("crsw") * lexer.delimited_range('/', false, false)
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local sigil27 = P("~") * S("crsw") * lexer.delimited_range('"', false, false)
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local sigil28 = P("~") * S("crsw") * lexer.delimited_range("'", false, false)
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local sigil29 = P("~") * S("csrw") * '"""' * (lexer.any - '"""')^0 * P('"""')^-1
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local sigil20 = P("~") * S("csrw") * "'''" * (lexer.any - "'''")^0 * P("'''")^-1
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local sigil_token = token(lexer.REGEX, sigil10 + sigil19 + sigil11 + sigil12 +
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sigil13 + sigil14 + sigil15 + sigil16 +
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sigil17 + sigil18 + sigil20 + sigil29 +
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sigil21 + sigil22 + sigil23 + sigil24 +
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sigil25 + sigil26 + sigil27 + sigil28)
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local sigiladdon_token = token(lexer.EMBEDDED, R('az', 'AZ')^0)
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lex:add_rule('sigil', sigil_token * sigiladdon_token)
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-- Atoms.
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local atom1 = B(1 - P(':')) * P(':') * lexer.delimited_range('"', false)
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local atom2 = B(1 - P(':')) * P(':') * R('az', 'AZ') *
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R('az', 'AZ', '__', '@@', '09')^0 * S('?!')^-1
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local atom3 = B(1 - R('az', 'AZ', '__', '09', '::')) *
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R('AZ') * R('az', 'AZ', '__', '@@', '09')^0 * S('?!')^-1
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lex:add_rule('atom', token(lexer.CONSTANT, atom1 + atom2 + atom3))
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-- Strings.
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local dq_str = lexer.delimited_range('"', false)
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local triple_dq_str = '"""' * (lexer.any - '"""')^0 * P('"""')^-1
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lex:add_rule('string', token(lexer.STRING, triple_dq_str + dq_str))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline_esc^0))
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-- Attributes.
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lex:add_rule('attribute', token(lexer.LABEL, B(1 - R('az', 'AZ', '__')) *
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P('@') * R('az','AZ') *
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R('az','AZ','09','__')^0))
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-- Booleans.
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lex:add_rule('boolean', token(lexer.NUMBER, P(':')^-1 *
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word_match[[true false nil]]))
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-- Functions.
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lex:add_rule('function', token(lexer.FUNCTION, word_match[[
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defstruct defrecordp defrecord defprotocol defp defoverridable defmodule
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defmacrop defmacro defimpl defexception defdelegate defcallback def
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]]))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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is_atom is_binary is_bitstring is_boolean is_float is_function is_integer
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is_list is_map is_number is_pid is_port is_record is_reference is_tuple
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is_exception case when cond for if unless try receive send exit raise throw
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after rescue catch else do end quote unquote super import require alias use
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self with fn
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]]))
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-- Operators
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local operator1 = word_match[[and or not when xor in]]
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local operator2 = P('!==') + '!=' + '!' + '=~' + '===' + '==' + '=' + '<<<' +
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'<<' + '<=' + '<-' + '<' + '>>>' + '>>' + '>=' + '>' + '->' +
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'--' + '-' + '++' + '+' + '&&&' + '&&' + '&' + '|||' + '||' +
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'|>' + '|' + '..' + '.' + '^^^' + '^' + '\\\\' + '::' + '*' +
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'/' + '~~~' + '@'
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lex:add_rule('operator', token(lexer.OPERATOR, operator1 + operator2))
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-- Identifiers
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lex:add_rule('identifier', token(lexer.IDENTIFIER, R('az', '__') *
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R('az', 'AZ', '__', '09')^0 *
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S('?!')^-1))
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-- Numbers
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local dec = lexer.digit * (lexer.digit + P("_"))^0
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local bin = '0b' * S('01')^1
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local oct = '0o' * R('07')^1
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local integer = bin + lexer.hex_num + oct + dec
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local float = lexer.digit^1 * P(".") * lexer.digit^1 * S("eE") *
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(S('+-')^-1 * lexer.digit^1)^-1
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lex:add_rule('number', B(1 - R('az', 'AZ', '__')) * S('+-')^-1 *
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token(lexer.NUMBER, float + integer))
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return lex
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