1 | #
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2 | # BaseEmitter
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3 | #
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4 |
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5 | require 'yaml/constants'
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6 | require 'yaml/encoding'
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7 | require 'yaml/error'
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8 |
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9 | module YAML
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10 |
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11 | module BaseEmitter
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12 |
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13 | def options( opt = nil )
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14 | if opt
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15 | @options[opt] || YAML::DEFAULTS[opt]
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16 | else
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17 | @options
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18 | end
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19 | end
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20 |
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21 | def options=( opt )
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22 | @options = opt
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23 | end
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24 |
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25 | #
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26 | # Emit binary data
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27 | #
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28 | def binary_base64( value )
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29 | self << "!binary "
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30 | self.node_text( [value].pack("m"), '|' )
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31 | end
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32 |
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33 | #
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34 | # Emit plain, normal flowing text
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35 | #
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36 | def node_text( value, block = nil )
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37 | @seq_map = false
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38 | valx = value.dup
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39 | unless block
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40 | block =
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41 | if options(:UseBlock)
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42 | '|'
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43 | elsif not options(:UseFold) and valx =~ /\n[ \t]/ and not valx =~ /#{YAML::ESCAPE_CHAR}/
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44 | '|'
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45 | else
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46 | '>'
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47 | end
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48 |
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49 | indt = $&.to_i if block =~ /\d+/
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50 | if valx =~ /(\A\n*[ \t#]|^---\s+)/
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51 | indt = options(:Indent) unless indt.to_i > 0
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52 | block += indt.to_s
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53 | end
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54 |
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55 | block +=
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56 | if valx =~ /\n\Z\n/
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57 | "+"
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58 | elsif valx =~ /\Z\n/
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59 | ""
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60 | else
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61 | "-"
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62 | end
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63 | end
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64 | block += "\n"
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65 | if block[0] == ?"
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66 | esc_skip = ( "\t\n" unless valx =~ /^[ \t]/ ) || ""
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67 | valx = fold( YAML::escape( valx, esc_skip ) + "\"" ).chomp
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68 | self << '"' + indent_text( valx, indt, false )
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69 | else
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70 | if block[0] == ?>
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71 | valx = fold( valx )
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72 | end
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73 | #p [block, indt]
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74 | self << block + indent_text( valx, indt )
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75 | end
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76 | end
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77 |
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78 | #
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79 | # Emit a simple, unqouted string
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80 | #
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81 | def simple( value )
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82 | @seq_map = false
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83 | self << value.to_s
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84 | end
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85 |
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86 | #
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87 | # Emit double-quoted string
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88 | #
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89 | def double( value )
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90 | "\"#{YAML.escape( value )}\""
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91 | end
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92 |
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93 | #
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94 | # Emit single-quoted string
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95 | #
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96 | def single( value )
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97 | "'#{value}'"
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98 | end
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99 |
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100 | #
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101 | # Write a text block with the current indent
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102 | #
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103 | def indent_text( text, mod, first_line = true )
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104 | return "" if text.to_s.empty?
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105 | spacing = indent( mod )
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106 | text = text.gsub( /\A([^\n])/, "#{ spacing }\\1" ) if first_line
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107 | return text.gsub( /\n^([^\n])/, "\n#{spacing}\\1" )
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108 | end
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109 |
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110 | #
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111 | # Write a current indent
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112 | #
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113 | def indent( mod = nil )
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114 | #p [ self.id, level, mod, :INDENT ]
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115 | if level <= 0
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116 | mod ||= 0
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117 | else
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118 | mod ||= options(:Indent)
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119 | mod += ( level - 1 ) * options(:Indent)
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120 | end
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121 | return " " * mod
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122 | end
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123 |
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124 | #
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125 | # Add indent to the buffer
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126 | #
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127 | def indent!
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128 | self << indent
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129 | end
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130 |
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131 | #
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132 | # Folding paragraphs within a column
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133 | #
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134 | def fold( value )
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135 | value.gsub( /(^[ \t]+.*$)|(\S.{0,#{options(:BestWidth) - 1}})(?:[ \t]+|(\n+(?=[ \t]|\Z))|$)/ ) do |s|
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136 | $1 || $2 + ( $3 || "\n" )
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137 | end
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138 | end
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139 |
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140 | #
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141 | # Quick mapping
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142 | #
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143 | def map( type, &e )
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144 | val = Mapping.new
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145 | e.call( val )
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146 | self << "#{type} " if type.length.nonzero?
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147 |
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148 | #
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149 | # Empty hashes
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150 | #
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151 | if val.length.zero?
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152 | self << "{}"
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153 | @seq_map = false
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154 | else
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155 | # FIXME
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156 | # if @buffer.length == 1 and options(:UseHeader) == false and type.length.zero?
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157 | # @headless = 1
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158 | # end
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159 |
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160 | defkey = @options.delete( :DefaultKey )
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161 | if defkey
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162 | seq_map_shortcut
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163 | self << "= : "
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164 | defkey.to_yaml( :Emitter => self )
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165 | end
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166 |
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167 | #
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168 | # Emit the key and value
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169 | #
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170 | val.each { |v|
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171 | seq_map_shortcut
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172 | if v[0].is_complex_yaml?
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173 | self << "? "
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174 | end
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175 | v[0].to_yaml( :Emitter => self )
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176 | if v[0].is_complex_yaml?
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177 | self << "\n"
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178 | indent!
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179 | end
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180 | self << ": "
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181 | v[1].to_yaml( :Emitter => self )
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182 | }
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183 | end
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184 | end
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185 |
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186 | def seq_map_shortcut
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187 | # FIXME: seq_map needs to work with the new anchoring system
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188 | # if @seq_map
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189 | # @anchor_extras[@buffer.length - 1] = "\n" + indent
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190 | # @seq_map = false
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191 | # else
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192 | self << "\n"
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193 | indent!
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194 | # end
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195 | end
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196 |
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197 | #
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198 | # Quick sequence
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199 | #
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200 | def seq( type, &e )
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201 | @seq_map = false
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202 | val = Sequence.new
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203 | e.call( val )
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204 | self << "#{type} " if type.length.nonzero?
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205 |
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206 | #
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207 | # Empty arrays
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208 | #
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209 | if val.length.zero?
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210 | self << "[]"
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211 | else
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212 | # FIXME
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213 | # if @buffer.length == 1 and options(:UseHeader) == false and type.length.zero?
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214 | # @headless = 1
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215 | # end
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216 |
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217 | #
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218 | # Emit the key and value
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219 | #
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220 | val.each { |v|
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221 | self << "\n"
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222 | indent!
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223 | self << "- "
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224 | @seq_map = true if v.class == Hash
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225 | v.to_yaml( :Emitter => self )
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226 | }
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227 | end
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228 | end
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229 |
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230 | end
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231 |
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232 | #
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233 | # Emitter helper classes
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234 | #
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235 | class Mapping < Array
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236 | def add( k, v )
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237 | push [k, v]
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238 | end
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239 | end
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240 |
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241 | class Sequence < Array
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242 | def add( v )
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243 | push v
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244 | end
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245 | end
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246 |
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247 | end
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