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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