61 lines
2.9 KiB
Factor
61 lines
2.9 KiB
Factor
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USING: help.markup help.syntax present multiline xml.data ;
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IN: xml.literals
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ABOUT: "xml.literals"
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ARTICLE: "xml.literals" "XML literals"
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"The " { $vocab-link "xml.literals" } " vocabulary provides a convenient syntax for generating XML documents and chunks. It defines the following parsing words:"
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{ $subsection POSTPONE: <XML }
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{ $subsection POSTPONE: [XML }
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"These can be used for creating an XML literal, which can be used with variables or a fry-like syntax to interpolate data into XML."
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{ $subsection { "xml.literals" "interpolation" } } ;
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HELP: <XML
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{ $syntax "<XML <?xml version=\"1.0\"?><document>...</document> XML>" }
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{ $description "This gives syntax for literal XML documents. When evaluated, there is an XML document (" { $link xml } ") on the stack. It can be used for interpolation as well, if interpolation slots are used. For more information about XML interpolation, see " { $link { "xml.literals" "interpolation" } } "." } ;
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HELP: [XML
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{ $syntax "[XML foo <x>...</x> bar <y>...</y> baz XML]" }
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{ $description "This gives syntax for literal XML documents. When evaluated, there is an XML chunk (" { $link xml-chunk } ") on the stack. For more information about XML interpolation, see " { $link { "xml.literals" "interpolation" } } "." } ;
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ARTICLE: { "xml.literals" "interpolation" } "XML interpolation syntax"
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"XML interpolation has two forms for each of the words " { $link POSTPONE: <XML } " and " { $link POSTPONE: [XML } ": a fry-like form and a locals form. To splice locals in, use the syntax " { $snippet "<-variable->" } ". To splice something in from the stack, in the style of " { $vocab-link "fry" } ", use the syntax " { $snippet "<->" } ". An XML interpolation form may only use one of these styles."
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$nl
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"These forms can be used where a tag might go, as in " { $snippet "[XML <foo><-></foo> XML]" } " or where an attribute might go, as in " { $snippet "[XML <foo bar=<->/> XML]" } ". When an attribute is spliced in, it is not included if the value is " { $snippet "f" } " and if the value is not a string, the value is put through " { $link present } ". Here is an example of the fry style of XML interpolation:"
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{ $example
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{" USING: splitting sequences xml.writer xml.literals ;
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"one two three" " " split
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[ [XML <item><-></item> XML] ] map
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<XML <doc><-></doc> XML> pprint-xml"}
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{" <?xml version="1.0" encoding="UTF-8"?>
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<doc>
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<item>
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one
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</item>
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<item>
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two
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</item>
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<item>
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three
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</item>
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</doc>"} }
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"Here is an example of the locals version:"
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{ $example
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{" USING: locals urls xml.literals xml.writer ;
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[let |
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number [ 3 ]
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false [ f ]
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url [ URL" http://factorcode.org/" ]
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string [ "hello" ]
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word [ \ drop ] |
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<XML
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<x
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number=<-number->
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false=<-false->
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url=<-url->
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string=<-string->
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word=<-word-> />
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XML> pprint-xml ] "}
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{" <?xml version="1.0" encoding="UTF-8"?>
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<x number="3" url="http://factorcode.org/" string="hello" word="drop"/>"} } ;
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