[279] | 1 | ##
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| 2 | # IO
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| 3 |
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| 4 | class IOError < StandardError; end
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| 5 | class EOFError < IOError; end
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| 6 |
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| 7 | class IO
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| 8 | SEEK_SET = 0
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| 9 | SEEK_CUR = 1
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| 10 | SEEK_END = 2
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| 11 |
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| 12 | BUF_SIZE = 4096
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| 13 |
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| 14 | def self.open(*args, &block)
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| 15 | io = self.new(*args)
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| 16 |
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| 17 | return io unless block
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| 18 |
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| 19 | begin
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| 20 | yield io
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| 21 | ensure
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| 22 | begin
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| 23 | io.close unless io.closed?
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| 24 | rescue StandardError
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| 25 | end
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| 26 | end
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| 27 | end
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| 28 |
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| 29 | def self.popen(command, mode = 'r', opts={}, &block)
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| 30 | if !self.respond_to?(:_popen)
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| 31 | raise NotImplementedError, "popen is not supported on this platform"
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| 32 | end
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| 33 | io = self._popen(command, mode, opts)
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| 34 | return io unless block
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| 35 |
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| 36 | begin
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| 37 | yield io
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| 38 | ensure
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| 39 | begin
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| 40 | io.close unless io.closed?
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| 41 | rescue IOError
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| 42 | # nothing
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| 43 | end
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| 44 | end
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| 45 | end
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| 46 |
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| 47 | def self.pipe(&block)
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| 48 | if !self.respond_to?(:_pipe)
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| 49 | raise NotImplementedError, "pipe is not supported on this platform"
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| 50 | end
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| 51 | if block
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| 52 | begin
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| 53 | r, w = IO._pipe
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| 54 | yield r, w
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| 55 | ensure
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| 56 | r.close unless r.closed?
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| 57 | w.close unless w.closed?
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| 58 | end
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| 59 | else
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| 60 | IO._pipe
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| 61 | end
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| 62 | end
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| 63 |
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| 64 | def self.read(path, length=nil, offset=nil, opt=nil)
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| 65 | if not opt.nil? # 4 arguments
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| 66 | offset ||= 0
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| 67 | elsif not offset.nil? # 3 arguments
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| 68 | if offset.is_a? Hash
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| 69 | opt = offset
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| 70 | offset = 0
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| 71 | else
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| 72 | opt = {}
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| 73 | end
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| 74 | elsif not length.nil? # 2 arguments
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| 75 | if length.is_a? Hash
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| 76 | opt = length
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| 77 | offset = 0
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| 78 | length = nil
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| 79 | else
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| 80 | offset = 0
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| 81 | opt = {}
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| 82 | end
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| 83 | else # only 1 argument
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| 84 | opt = {}
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| 85 | offset = 0
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| 86 | length = nil
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| 87 | end
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| 88 |
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| 89 | str = ""
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| 90 | fd = -1
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| 91 | io = nil
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| 92 | begin
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| 93 | if path[0] == "|"
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| 94 | io = IO.popen(path[1..-1], (opt[:mode] || "r"))
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| 95 | else
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| 96 | fd = IO.sysopen(path)
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| 97 | io = IO.open(fd, opt[:mode] || "r")
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| 98 | end
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| 99 | io.seek(offset) if offset > 0
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| 100 | str = io.read(length)
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| 101 | ensure
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| 102 | if io
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| 103 | io.close
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| 104 | elsif fd != -1
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| 105 | IO._sysclose(fd)
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| 106 | end
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| 107 | end
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| 108 | str
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| 109 | end
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| 110 |
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| 111 | def flush
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| 112 | # mruby-io always writes immediately (no output buffer).
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| 113 | raise IOError, "closed stream" if self.closed?
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| 114 | self
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| 115 | end
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| 116 |
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| 117 | def hash
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| 118 | # We must define IO#hash here because IO includes Enumerable and
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| 119 | # Enumerable#hash will call IO#read...
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| 120 | self.__id__
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| 121 | end
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| 122 |
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| 123 | def write(string)
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| 124 | str = string.is_a?(String) ? string : string.to_s
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| 125 | return str.size unless str.size > 0
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| 126 |
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| 127 | len = syswrite(str)
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| 128 | if len != -1
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| 129 | @pos += len
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| 130 | return len
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| 131 | end
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| 132 |
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| 133 | raise IOError
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| 134 | end
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| 135 |
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| 136 | def <<(str)
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| 137 | write(str)
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| 138 | self
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| 139 | end
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| 140 |
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| 141 | def eof?
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| 142 | _check_readable
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| 143 | begin
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| 144 | buf = _read_buf
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| 145 | return buf.size == 0
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| 146 | rescue EOFError
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| 147 | return true
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| 148 | end
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| 149 | end
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| 150 | alias_method :eof, :eof?
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| 151 |
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| 152 | def pos
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| 153 | raise IOError if closed?
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| 154 | @pos
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| 155 | end
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| 156 | alias_method :tell, :pos
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| 157 |
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| 158 | def pos=(i)
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| 159 | seek(i, SEEK_SET)
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| 160 | end
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| 161 |
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| 162 | def rewind
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| 163 | seek(0, SEEK_SET)
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| 164 | end
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| 165 |
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| 166 | def seek(i, whence = SEEK_SET)
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| 167 | raise IOError if closed?
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| 168 | @pos = sysseek(i, whence)
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| 169 | @buf = ''
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| 170 | 0
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| 171 | end
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| 172 |
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| 173 | def _read_buf
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| 174 | return @buf if @buf && @buf.size > 0
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| 175 | @buf = sysread(BUF_SIZE)
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| 176 | end
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| 177 |
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| 178 | def ungetc(substr)
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| 179 | raise TypeError.new "expect String, got #{substr.class}" unless substr.is_a?(String)
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| 180 | @pos -= substr.size
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| 181 | if @buf.empty?
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| 182 | @buf = substr.dup
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| 183 | else
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| 184 | @buf = substr + @buf
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| 185 | end
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| 186 | nil
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| 187 | end
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| 188 |
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| 189 | def read(length = nil)
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| 190 | unless length.nil?
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| 191 | unless length.is_a? Fixnum
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| 192 | raise TypeError.new "can't convert #{length.class} into Integer"
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| 193 | end
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| 194 | if length < 0
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| 195 | raise ArgumentError.new "negative length: #{length} given"
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| 196 | end
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| 197 | if length == 0
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| 198 | return "" # easy case
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| 199 | end
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| 200 | end
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| 201 |
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| 202 | array = []
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| 203 | start_pos = @pos
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| 204 | while 1
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| 205 | begin
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| 206 | _read_buf
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| 207 | rescue EOFError => e
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| 208 | array = nil if array.empty? and (not length.nil?) and length != 0
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| 209 | break
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| 210 | end
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| 211 |
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| 212 | if length && (@pos - start_pos + @buf.size) >= length
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| 213 | len = length - (@pos - start_pos)
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| 214 | array.push @buf[0, len]
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| 215 | @pos += len
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| 216 | @buf = @buf[len, @buf.size - len]
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| 217 | break
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| 218 | else
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| 219 | array.push @buf
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| 220 | @pos += @buf.size
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| 221 | @buf = ''
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| 222 | end
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| 223 | end
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| 224 |
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| 225 | array && array.join
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| 226 | end
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| 227 |
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| 228 | def readline(arg = $/, limit = nil)
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| 229 | case arg
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| 230 | when String
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| 231 | rs = arg
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| 232 | when Fixnum
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| 233 | rs = $/
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| 234 | limit = arg
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| 235 | else
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| 236 | raise ArgumentError
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| 237 | end
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| 238 |
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| 239 | if rs.nil?
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| 240 | return read
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| 241 | end
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| 242 |
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| 243 | if rs == ""
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| 244 | rs = $/ + $/
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| 245 | end
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| 246 |
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| 247 | array = []
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| 248 | start_pos = @pos
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| 249 | while 1
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| 250 | begin
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| 251 | _read_buf
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| 252 | rescue EOFError => e
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| 253 | array = nil if array.empty?
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| 254 | break
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| 255 | end
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| 256 |
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| 257 | if limit && (@pos - start_pos + @buf.size) >= limit
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| 258 | len = limit - (@pos - start_pos)
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| 259 | array.push @buf[0, len]
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| 260 | @pos += len
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| 261 | @buf = @buf[len, @buf.size - len]
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| 262 | break
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| 263 | elsif idx = @buf.index(rs)
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| 264 | len = idx + rs.size
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| 265 | array.push @buf[0, len]
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| 266 | @pos += len
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| 267 | @buf = @buf[len, @buf.size - len]
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| 268 | break
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| 269 | else
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| 270 | array.push @buf
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| 271 | @pos += @buf.size
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| 272 | @buf = ''
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| 273 | end
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| 274 | end
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| 275 |
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| 276 | raise EOFError.new "end of file reached" if array.nil?
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| 277 |
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| 278 | array.join
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| 279 | end
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| 280 |
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| 281 | def gets(*args)
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| 282 | begin
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| 283 | readline(*args)
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| 284 | rescue EOFError => e
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| 285 | nil
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| 286 | end
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| 287 | end
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| 288 |
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| 289 | def readchar
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| 290 | _read_buf
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| 291 | c = @buf[0]
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| 292 | @buf = @buf[1, @buf.size]
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| 293 | @pos += 1
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| 294 | c
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| 295 | end
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| 296 |
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| 297 | def getc
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| 298 | begin
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| 299 | readchar
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| 300 | rescue EOFError => e
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| 301 | nil
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| 302 | end
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| 303 | end
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| 304 |
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| 305 | # 15.2.20.5.3
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| 306 | def each(&block)
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| 307 | while line = self.gets
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| 308 | block.call(line)
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| 309 | end
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| 310 | self
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| 311 | end
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| 312 |
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| 313 | # 15.2.20.5.4
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| 314 | def each_byte(&block)
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| 315 | while char = self.getc
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| 316 | block.call(char)
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| 317 | end
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| 318 | self
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| 319 | end
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| 320 |
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| 321 | # 15.2.20.5.5
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| 322 | alias each_line each
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| 323 |
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| 324 | alias each_char each_byte
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| 325 |
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| 326 | def readlines
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| 327 | ary = []
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| 328 | while (line = gets)
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| 329 | ary << line
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| 330 | end
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| 331 | ary
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| 332 | end
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| 333 |
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| 334 | def puts(*args)
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| 335 | i = 0
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| 336 | len = args.size
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| 337 | while i < len
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| 338 | s = args[i].to_s
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| 339 | write s
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| 340 | write "\n" if (s[-1] != "\n")
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| 341 | i += 1
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| 342 | end
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| 343 | write "\n" if len == 0
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| 344 | nil
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| 345 | end
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| 346 |
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| 347 | def print(*args)
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| 348 | i = 0
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| 349 | len = args.size
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| 350 | while i < len
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| 351 | write args[i].to_s
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| 352 | i += 1
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| 353 | end
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| 354 | end
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| 355 |
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| 356 | def printf(*args)
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| 357 | write sprintf(*args)
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| 358 | nil
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| 359 | end
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| 360 |
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| 361 | alias_method :to_i, :fileno
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| 362 | alias_method :tty?, :isatty
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| 363 | end
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| 364 |
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| 365 | STDIN = IO.open(0, "r")
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| 366 | STDOUT = IO.open(1, "w")
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| 367 | STDERR = IO.open(2, "w")
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| 368 |
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| 369 | $stdin = STDIN
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| 370 | $stdout = STDOUT
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| 371 | $stderr = STDERR
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| 372 |
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| 373 | module Kernel
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| 374 | def print(*args)
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| 375 | $stdout.print(*args)
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| 376 | end
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| 377 |
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| 378 | def puts(*args)
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| 379 | $stdout.puts(*args)
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| 380 | end
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| 381 |
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| 382 | def printf(*args)
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| 383 | $stdout.printf(*args)
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| 384 | end
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| 385 |
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| 386 | def gets(*args)
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| 387 | $stdin.gets(*args)
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| 388 | end
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| 389 |
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| 390 | def getc(*args)
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| 391 | $stdin.getc(*args)
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| 392 | end
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| 393 | end
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