1 | require "rexml/child"
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2 | require "rexml/source"
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3 |
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4 | module REXML
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5 | # Represents an XML Instruction; IE, <? ... ?>
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6 | # TODO: Add parent arg (3rd arg) to constructor
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7 | class Instruction < Child
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8 | START = '<\?'
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9 | STOP = '\?>'
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10 |
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11 | # target is the "name" of the Instruction; IE, the "tag" in <?tag ...?>
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12 | # content is everything else.
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13 | attr_accessor :target, :content
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14 |
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15 | # Constructs a new Instruction
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16 | # @param target can be one of a number of things. If String, then
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17 | # the target of this instruction is set to this. If an Instruction,
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18 | # then the Instruction is shallowly cloned (target and content are
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19 | # copied). If a Source, then the source is scanned and parsed for
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20 | # an Instruction declaration.
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21 | # @param content Must be either a String, or a Parent. Can only
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22 | # be a Parent if the target argument is a Source. Otherwise, this
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23 | # String is set as the content of this instruction.
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24 | def initialize(target, content=nil)
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25 | if target.kind_of? String
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26 | super()
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27 | @target = target
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28 | @content = content
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29 | elsif target.kind_of? Instruction
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30 | super(content)
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31 | @target = target.target
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32 | @content = target.content
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33 | end
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34 | @content.strip! if @content
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35 | end
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36 |
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37 | def clone
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38 | Instruction.new self
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39 | end
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40 |
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41 | def write writer, indent=-1, transitive=false, ie_hack=false
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42 | indent(writer, indent)
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43 | writer << START.sub(/\\/u, '')
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44 | writer << @target
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45 | writer << ' '
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46 | writer << @content
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47 | writer << STOP.sub(/\\/u, '')
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48 | end
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49 |
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50 | # @return true if other is an Instruction, and the content and target
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51 | # of the other matches the target and content of this object.
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52 | def ==( other )
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53 | other.kind_of? Instruction and
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54 | other.target == @target and
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55 | other.content == @content
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56 | end
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57 |
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58 | def node_type
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59 | :processing_instruction
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60 | end
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61 |
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62 | def inspect
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63 | "<?p-i #{target} ...?>"
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64 | end
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65 | end
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66 | end
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