sigel.xslt.core — me.flowthing/sigel 0.2.3

Write and execute XSLT transformations with Clojure.

XML namespaces

Scenario:

• Your source XML document is in an XML namespace.
• You want to transform that document with Sigel into the same namespace.
• You want to write literal XML elements in your transformation, instead of using xsl:element.

For example, you want to transform this:

<a xmlns="my-ns"/>

To this:

<b xmlns="my-ns"/>

In your XSLT transformation, you want to write something like this:

(xsl/template {:match "a"} [:b])

Instead of this:

(xsl/template {:match "a"}
  (xsl/element {:name "b"}))

If you create a literal element with [:b], though, clojure.data.xml puts it into the empty namespace. That means that the XSLT stylesheet Sigel produces will have this:

<xsl:template match="a">
  <!-- note the empty xmlns namespace declaration -->
  <b xmlns=""/>
</xsl:template>

When what you actually want is this:

<xsl:template match="a">
  <b/>
</xsl:template>

To do that, you must first set up your namespace with clojure.data.xml/alias-uri:

(xml/alias-uri 'my-ns "my-ns-uri")

You then need to set the xmlns attribute of your stylesheet and use the my-ns prefix when emitting literal XML elements:

(xsl/stylesheet {:version 3.0 :xmlns "my-ns-uri"}
  (xsl/template {:match "a"} [::my-ns/b]))

*compiler* clj

A default XSLT compiler.

If you don't pass in your own XsltCompiler instance when compiling a stylesheet, Sigel uses this instance.

apply-templates clj

(apply-templates transformer source)

(apply-templates transformer source destination)

compile-edn clj

(compile-edn path)

Compile a stylesheet defined in an EDN file.

To write an EDN stylesheet, instead of calling the functions in the sigel.xslt.elements namespace, use the :xsl namespace prefix like this:

;; a.edn
[:xsl/stylesheet {:version 3.0}
  [:xsl/template {:match "a"} [:b]]]

Then compile the stylesheet and transform some XML with it:

(xslt/transform (xslt/compile-edn "resources/examples/a.edn") "<a/>")
;;=> #object[net.sf.saxon.s9api.XdmNode 0xf2a49c4 "<b/>"]

compile-sexp clj

(compile-sexp stylesheet)

(compile-sexp compiler stylesheet)

Compile an XSLT stylesheet written in Clojure.

If you don't pass in an XsltCompiler, Sigel uses *compiler*.

You can execute the compiled stylesheet with transform.

Example:

;; Define an XSLT stylesheet.
(def stylesheet
  (xsl/stylesheet {:version 3.0}
    (xsl/template {:match "a"} [:b])))

;; Compile the stylesheet.
(xslt/compile-sexp stylesheet)
;;=> #object[net.sf.saxon.s9api.XsltExecutable 0x1098b3aa "net.sf.saxon.s9api.XsltExecutable@1098b3aa"]

compile-source clj

(compile-source stylesheet)

(compile-source compiler stylesheet)

Compile an XSLT stylesheet from a Source.

compile-xslt clj

(compile-xslt input)

Compile a stylesheet defined in an XSLT resource.

The input must be something that [[io/input-stream]] can coerce into an input stream.

compiler clj

(compiler)

Create a new XsltCompiler.

pipeline clj

(pipeline [ex & exs] params source destination)

transform clj

(transform executables source)

(transform executables params source)

Execute one or more XSLT transformations on the given source file.

Example:

;; Define an XSLT transformation.
(def stylesheet
  (xslt3-identity (xsl/template {:match "a"} [:b])))

;; Compile the stylesheet and use it to transform "<a/>".
(xslt/transform (xslt/compile-sexp stylesheet) "<a/>")
;;=> "<b/>"

To execute multiple transformations in sequence, pass a sequence of compiled stylesheets.

Example:

(def stylesheet-1
  (xslt3-identity (xsl/template {:match "a"} [:b])))

(def stylesheet-2
  (xslt3-identity (xsl/template {:match "b"} [:c])))

(def compiled-stylesheets
  [(xslt/compile-sexp stylesheet-1) (xslt/compile-sexp stylesheet-2)])

(xslt/transform compiled-stylesheets "<a/>")
;;=> "<c/>"

You can pass a map of parameters to the XSLT stylesheet.

Example:

(def xslt
  (xsl/stylesheet {:version 3.0 :xmlns:xs "http://www.w3.org/2001/XMLSchema"}
    (xsl/param {:name "factor" :as "xs:integer"})

    (xsl/template {:match "num"}
      (xsl/copy (xsl/value-of {:select "xs:int(.) * $factor"})))))

(xslt/transform (xslt/compile-sexp xslt) {:factor 10} "<num>1</num>")
;;=> "<num>10</num>"

transform-to-file clj

(transform-to-file executables source target)

(transform-to-file executables params source target)

Execute one or more XSLT transformations on the given source file.

See also transform.

Example:

;; Define an XSLT transformation.
(def stylesheet
  (xslt3-identity (xsl/template {:match "a"} [:b])))

;; Compile the stylesheet and use it to transform "<a/>".
;;
;; Save the result of the transformation into "/tmp/b.xml".
(xslt/transform-to-file (xslt/compile-sexp stylesheet)
                        "<a/>"
                        (io/file "/tmp/b.xml")