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require "rexml/child"
require "rexml/source"
module REXML
# Represents an XML Instruction; IE, <? ... ?>
class Instruction < Child
START = '<\?'
START_RE = /\A<\?/u
STOP = '\?>'
STOP_RE = /\?>/u
PATTERN = /#{START}(.*?)(\s+.*?)?#{STOP}/um
# target is the "name" of the Instruction; IE, the "tag" in <?tag ...?>
# content is everything else.
attr_accessor :target, :content
# Constructs a new Instruction
# @param target can be one of a number of things. If String, then
# the target of this instruction is set to this. If an Instruction,
# then the Instruction is shallowly cloned (target and content are
# copied). If a Source, then the source is scanned and parsed for
# an Instruction declaration.
# @param content Must be either a String, or a Parent. Can only
# be a Parent if the target argument is a Source. Otherwise, this
# String is set as the content of this instruction.
def initialize(target, content=nil)
if target.kind_of? Source
super(content)
md = target.match(PATTERN, true)
@target, @content = md[1], md[2]
elsif target.kind_of? String
super()
@target = target
@content = content
elsif target.kind_of? Instruction
super(content)
@target = target.target
@content = target.content
end
@content.strip! if @content
end
def clone
Instruction.new self
end
def write writer, indent=0
indent(writer, indent)
writer << START.sub(/\\/u, '')
writer << @target
writer << ' '
writer << @content
writer << STOP.sub(/\\/u, '')
end
# @return true if other is an Instruction, and the content and target
# of the other matches the target and content of this object.
def ==( other )
other.kind_of? Instruction and
other.target == @target and
other.content == @content
end
def Instruction.parse_stream source, listener
md = source.match(PATTERN, true)
listener.instruction md[1], md[2]
end
end
end
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