# frozen_string_literal: false

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module IRB

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class << (MagicFile = Object.new)

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# see parser_magic_comment in parse.y

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ENCODING_SPEC_RE = %r"coding\s*[=:]\s*([[:alnum:]\-_]+)"

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def open(path)

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io = File.open(path, 'rb')

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line = io.gets

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line = io.gets if line[0,2] == "#!"

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encoding = detect_encoding(line)

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internal_encoding = encoding

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encoding ||= IRB.default_src_encoding

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io.rewind

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io.set_encoding(encoding, internal_encoding)

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if block_given?

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begin

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return (yield io)

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ensure

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io.close

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end

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else

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return io

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end

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end

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private

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def detect_encoding(line)

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return unless line[0] == ?#

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line = line[1..-1]

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line = $1 if line[/-\*-\s*(.*?)\s*-*-$/]

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return nil unless ENCODING_SPEC_RE =~ line

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encoding = $1

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return encoding.sub(/-(?:mac|dos|unix)/i, '')

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end

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end

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end

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