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Diffstat (limited to 'activesupport/lib/active_support/vendor/builder-2.1.2/lib/builder/xmlmarkup.rb')
| -rw-r--r-- | activesupport/lib/active_support/vendor/builder-2.1.2/lib/builder/xmlmarkup.rb | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/vendor/builder-2.1.2/lib/builder/xmlmarkup.rb b/activesupport/lib/active_support/vendor/builder-2.1.2/lib/builder/xmlmarkup.rb new file mode 100644 index 0000000000..ec59dddc36 --- /dev/null +++ b/activesupport/lib/active_support/vendor/builder-2.1.2/lib/builder/xmlmarkup.rb @@ -0,0 +1,328 @@ +#!/usr/bin/env ruby +#-- +# Copyright 2004, 2005 by Jim Weirich (jim@weirichhouse.org). +# All rights reserved. + +# Permission is granted for use, copying, modification, distribution, +# and distribution of modified versions of this work as long as the +# above copyright notice is included. +#++ + +# Provide a flexible and easy to use Builder for creating XML markup. +# See XmlBuilder for usage details. + +require 'builder/xmlbase' + +module Builder + + # Create XML markup easily. All (well, almost all) methods sent to + # an XmlMarkup object will be translated to the equivalent XML + # markup. Any method with a block will be treated as an XML markup + # tag with nested markup in the block. + # + # Examples will demonstrate this easier than words. In the + # following, +xm+ is an +XmlMarkup+ object. + # + # xm.em("emphasized") # => <em>emphasized</em> + # xm.em { xmm.b("emp & bold") } # => <em><b>emph & bold</b></em> + # xm.a("A Link", "href"=>"http://onestepback.org") + # # => <a href="http://onestepback.org">A Link</a> + # xm.div { br } # => <div><br/></div> + # xm.target("name"=>"compile", "option"=>"fast") + # # => <target option="fast" name="compile"\> + # # NOTE: order of attributes is not specified. + # + # xm.instruct! # <?xml version="1.0" encoding="UTF-8"?> + # xm.html { # <html> + # xm.head { # <head> + # xm.title("History") # <title>History</title> + # } # </head> + # xm.body { # <body> + # xm.comment! "HI" # <! -- HI --> + # xm.h1("Header") # <h1>Header</h1> + # xm.p("paragraph") # <p>paragraph</p> + # } # </body> + # } # </html> + # + # == Notes: + # + # * The order that attributes are inserted in markup tags is + # undefined. + # + # * Sometimes you wish to insert text without enclosing tags. Use + # the <tt>text!</tt> method to accomplish this. + # + # Example: + # + # xm.div { # <div> + # xm.text! "line"; xm.br # line<br/> + # xm.text! "another line"; xmbr # another line<br/> + # } # </div> + # + # * The special XML characters <, >, and & are converted to <, + # > and & automatically. Use the <tt><<</tt> operation to + # insert text without modification. + # + # * Sometimes tags use special characters not allowed in ruby + # identifiers. Use the <tt>tag!</tt> method to handle these + # cases. + # + # Example: + # + # xml.tag!("SOAP:Envelope") { ... } + # + # will produce ... + # + # <SOAP:Envelope> ... </SOAP:Envelope>" + # + # <tt>tag!</tt> will also take text and attribute arguments (after + # the tag name) like normal markup methods. (But see the next + # bullet item for a better way to handle XML namespaces). + # + # * Direct support for XML namespaces is now available. If the + # first argument to a tag call is a symbol, it will be joined to + # the tag to produce a namespace:tag combination. It is easier to + # show this than describe it. + # + # xml.SOAP :Envelope do ... end + # + # Just put a space before the colon in a namespace to produce the + # right form for builder (e.g. "<tt>SOAP:Envelope</tt>" => + # "<tt>xml.SOAP :Envelope</tt>") + # + # * XmlMarkup builds the markup in any object (called a _target_) + # that accepts the <tt><<</tt> method. If no target is given, + # then XmlMarkup defaults to a string target. + # + # Examples: + # + # xm = Builder::XmlMarkup.new + # result = xm.title("yada") + # # result is a string containing the markup. + # + # buffer = "" + # xm = Builder::XmlMarkup.new(buffer) + # # The markup is appended to buffer (using <<) + # + # xm = Builder::XmlMarkup.new(STDOUT) + # # The markup is written to STDOUT (using <<) + # + # xm = Builder::XmlMarkup.new + # x2 = Builder::XmlMarkup.new(:target=>xm) + # # Markup written to +x2+ will be send to +xm+. + # + # * Indentation is enabled by providing the number of spaces to + # indent for each level as a second argument to XmlBuilder.new. + # Initial indentation may be specified using a third parameter. + # + # Example: + # + # xm = Builder.new(:indent=>2) + # # xm will produce nicely formatted and indented XML. + # + # xm = Builder.new(:indent=>2, :margin=>4) + # # xm will produce nicely formatted and indented XML with 2 + # # spaces per indent and an over all indentation level of 4. + # + # builder = Builder::XmlMarkup.new(:target=>$stdout, :indent=>2) + # builder.name { |b| b.first("Jim"); b.last("Weirich) } + # # prints: + # # <name> + # # <first>Jim</first> + # # <last>Weirich</last> + # # </name> + # + # * The instance_eval implementation which forces self to refer to + # the message receiver as self is now obsolete. We now use normal + # block calls to execute the markup block. This means that all + # markup methods must now be explicitly send to the xml builder. + # For instance, instead of + # + # xml.div { strong("text") } + # + # you need to write: + # + # xml.div { xml.strong("text") } + # + # Although more verbose, the subtle change in semantics within the + # block was found to be prone to error. To make this change a + # little less cumbersome, the markup block now gets the markup + # object sent as an argument, allowing you to use a shorter alias + # within the block. + # + # For example: + # + # xml_builder = Builder::XmlMarkup.new + # xml_builder.div { |xml| + # xml.stong("text") + # } + # + class XmlMarkup < XmlBase + + # Create an XML markup builder. Parameters are specified by an + # option hash. + # + # :target=><em>target_object</em>:: + # Object receiving the markup. +out+ must respond to the + # <tt><<</tt> operator. The default is a plain string target. + # + # :indent=><em>indentation</em>:: + # Number of spaces used for indentation. The default is no + # indentation and no line breaks. + # + # :margin=><em>initial_indentation_level</em>:: + # Amount of initial indentation (specified in levels, not + # spaces). + # + # :escape_attrs=><b>OBSOLETE</em>:: + # The :escape_attrs option is no longer supported by builder + # (and will be quietly ignored). String attribute values are + # now automatically escaped. If you need unescaped attribute + # values (perhaps you are using entities in the attribute + # values), then give the value as a Symbol. This allows much + # finer control over escaping attribute values. + # + def initialize(options={}) + indent = options[:indent] || 0 + margin = options[:margin] || 0 + super(indent, margin) + @target = options[:target] || "" + end + + # Return the target of the builder. + def target! + @target + end + + def comment!(comment_text) + _ensure_no_block block_given? + _special("<!-- ", " -->", comment_text, nil) + end + + # Insert an XML declaration into the XML markup. + # + # For example: + # + # xml.declare! :ELEMENT, :blah, "yada" + # # => <!ELEMENT blah "yada"> + def declare!(inst, *args, &block) + _indent + @target << "<!#{inst}" + args.each do |arg| + case arg + when String + @target << %{ "#{arg}"} # " WART + when Symbol + @target << " #{arg}" + end + end + if block_given? + @target << " [" + _newline + _nested_structures(block) + @target << "]" + end + @target << ">" + _newline + end + + # Insert a processing instruction into the XML markup. E.g. + # + # For example: + # + # xml.instruct! + # #=> <?xml version="1.0" encoding="UTF-8"?> + # xml.instruct! :aaa, :bbb=>"ccc" + # #=> <?aaa bbb="ccc"?> + # + def instruct!(directive_tag=:xml, attrs={}) + _ensure_no_block block_given? + if directive_tag == :xml + a = { :version=>"1.0", :encoding=>"UTF-8" } + attrs = a.merge attrs + end + _special( + "<?#{directive_tag}", + "?>", + nil, + attrs, + [:version, :encoding, :standalone]) + end + + # Insert a CDATA section into the XML markup. + # + # For example: + # + # xml.cdata!("text to be included in cdata") + # #=> <![CDATA[text to be included in cdata]]> + # + def cdata!(text) + _ensure_no_block block_given? + _special("<![CDATA[", "]]>", text, nil) + end + + private + + # NOTE: All private methods of a builder object are prefixed when + # a "_" character to avoid possible conflict with XML tag names. + + # Insert text directly in to the builder's target. + def _text(text) + @target << text + end + + # Insert special instruction. + def _special(open, close, data=nil, attrs=nil, order=[]) + _indent + @target << open + @target << data if data + _insert_attributes(attrs, order) if attrs + @target << close + _newline + end + + # Start an XML tag. If <tt>end_too</tt> is true, then the start + # tag is also the end tag (e.g. <br/> + def _start_tag(sym, attrs, end_too=false) + @target << "<#{sym}" + _insert_attributes(attrs) + @target << "/" if end_too + @target << ">" + end + + # Insert an ending tag. + def _end_tag(sym) + @target << "</#{sym}>" + end + + # Insert the attributes (given in the hash). + def _insert_attributes(attrs, order=[]) + return if attrs.nil? + order.each do |k| + v = attrs[k] + @target << %{ #{k}="#{_attr_value(v)}"} if v # " WART + end + attrs.each do |k, v| + @target << %{ #{k}="#{_attr_value(v)}"} unless order.member?(k) # " WART + end + end + + def _attr_value(value) + case value + when Symbol + value.to_s + else + _escape_quote(value.to_s) + end + end + + def _ensure_no_block(got_block) + if got_block + fail IllegalBlockError, + "Blocks are not allowed on XML instructions" + end + end + + end + +end |