goxslt

A proof-of-concept XSLT processor written in Go.

Note: This is an experimental implementation and not intended for production use. It supports only a subset of the XSLT specification.

Supported Features

Instructions

• xsl:template (match and named templates with priority)
• xsl:apply-templates with xsl:sort and xsl:with-param
• xsl:call-template with xsl:with-param
• xsl:value-of
• xsl:for-each with xsl:sort
• xsl:for-each-group (group-by, current-group(), current-grouping-key())
• xsl:if, xsl:choose/xsl:when/xsl:otherwise
• xsl:variable, xsl:param (with as type declarations)
• xsl:copy, xsl:copy-of
• xsl:element, xsl:attribute
• xsl:text, xsl:sequence
• xsl:comment, xsl:processing-instruction
• xsl:number (single/multiple/any level, format patterns)
• xsl:message (with terminate, custom message handler)
• xsl:result-document (multiple output documents)
• xsl:analyze-string with xsl:matching-substring/xsl:non-matching-substring and regex-group()
• xsl:map, xsl:map-entry (XPath maps and arrays supported)
• xsl:function (stylesheet functions callable from XPath)

Stylesheet Structure

• xsl:output (method, indent, version, omit-xml-declaration)
• xsl:import and xsl:include (with precedence and cycle detection)
• Stylesheet parameters (xsl:param at top level, passable via CLI or API)
• Attribute Value Templates (class="item-{@id}")
• Literal result elements
• Match patterns with predicates (book[@lang='en']), path patterns, union patterns

Installation

go install github.com/speedata/goxslt/cmd/goxslt@latest

Usage

goxslt -s source.xml -t stylesheet.xsl [-o output.xml] [param=value ...]

Library Usage

package main

import (
    "fmt"
    "os"

    "github.com/speedata/goxml"
    "github.com/speedata/goxslt"
)

func main() {
    sourceDoc, _ := goxml.Parse(os.Stdin)
    xsltFile, _ := os.Open("style.xsl")
    xsltDoc, _ := goxml.Parse(xsltFile)

    ss, _ := goxslt.Compile(xsltDoc)
    result, _ := goxslt.Transform(ss, sourceDoc)

    fmt.Print(goxslt.SerializeIndent(result.Document, "  "))

    // Secondary documents produced by xsl:result-document
    for href, doc := range result.SecondaryDocuments {
        os.WriteFile(href, []byte(goxslt.SerializeResult(doc)), 0644)
    }
}

W3C XSLT Test Suite

To run the W3C XSLT 3.0 conformance tests, clone the test suite into testdata/w3c/:

git clone https://github.com/w3c/xslt30-test.git testdata/w3c

Then run:

go test -v -run TestW3C ./...

The directory is listed in .gitignore. If it is not present, the tests are skipped automatically.

License

MIT — see LICENSE.