Class: Nokogiri::XSLT::Stylesheet

Inherits:
Object
  • Object
show all
Defined in:
lib/nokogiri/xslt/stylesheet.rb,
ext/nokogiri/xslt_stylesheet.c

Overview

A Stylesheet represents an XSLT Stylesheet object. Stylesheet creation is done through Nokogiri.XSLT. Here is an example of transforming an XML::Document with a Stylesheet:

doc   = Nokogiri::XML(File.read('some_file.xml'))
xslt  = Nokogiri::XSLT(File.read('some_transformer.xslt'))

puts xslt.transform(doc)

See Nokogiri::XSLT::Stylesheet#transform for more transformation information.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.parse_stylesheet_doc(document) ⇒ Object

Parse a stylesheet from document.



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# File 'ext/nokogiri/xslt_stylesheet.c', line 64

static VALUE parse_stylesheet_doc(VALUE klass, VALUE xmldocobj)
{
    xmlDocPtr xml, xml_cpy;
    VALUE errstr, exception;
    xsltStylesheetPtr ss ;
    Data_Get_Struct(xmldocobj, xmlDoc, xml);
    exsltRegisterAll();

    errstr = rb_str_new(0, 0);
    xsltSetGenericErrorFunc((void *)errstr, xslt_generic_error_handler);

    xml_cpy = xmlCopyDoc(xml, 1); /* 1 => recursive */
    ss = xsltParseStylesheetDoc(xml_cpy);

    xsltSetGenericErrorFunc(NULL, NULL);

    if (!ss) {
	xmlFreeDoc(xml_cpy);
	exception = rb_exc_new3(rb_eRuntimeError, errstr);
	rb_exc_raise(exception);
    }

    return Nokogiri_wrap_xslt_stylesheet(ss);
}

Instance Method Details

#apply_to(document, params = []) ⇒ Object

Apply an XSLT stylesheet to an XML::Document. params is an array of strings used as XSLT parameters. returns serialized document



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# File 'lib/nokogiri/xslt/stylesheet.rb', line 20

def apply_to document, params = []
  serialize(transform(document, params))
end

#serialize(document) ⇒ Object

Serialize document to an xml string.



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# File 'ext/nokogiri/xslt_stylesheet.c', line 96

static VALUE serialize(VALUE self, VALUE xmlobj)
{
    xmlDocPtr xml ;
    nokogiriXsltStylesheetTuple *wrapper;
    xmlChar* doc_ptr ;
    int doc_len ;
    VALUE rval ;

    Data_Get_Struct(xmlobj, xmlDoc, xml);
    Data_Get_Struct(self, nokogiriXsltStylesheetTuple, wrapper);
    xsltSaveResultToString(&doc_ptr, &doc_len, xml, wrapper->ss);
    rval = NOKOGIRI_STR_NEW(doc_ptr, doc_len);
    xmlFree(doc_ptr);
    return rval ;
}

#transform(document, params = []) ⇒ Object

Apply an XSLT stylesheet to an XML::Document. params is an array of strings used as XSLT parameters. returns Nokogiri::XML::Document

Example:

doc   = Nokogiri::XML(File.read(ARGV[0]))
xslt  = Nokogiri::XSLT(File.read(ARGV[1]))
puts xslt.transform(doc, ['key', 'value'])


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# File 'ext/nokogiri/xslt_stylesheet.c', line 131

static VALUE transform(int argc, VALUE* argv, VALUE self)
{
    VALUE xmldoc, paramobj, errstr, exception ;
    xmlDocPtr xml ;
    xmlDocPtr result ;
    nokogiriXsltStylesheetTuple *wrapper;
    const char** params ;
    long param_len, j ;
    int parse_error_occurred ;

    rb_scan_args(argc, argv, "11", &xmldoc, &paramobj);
    if (NIL_P(paramobj)) { paramobj = rb_ary_new2(0L) ; }
    if (!rb_obj_is_kind_of(xmldoc, cNokogiriXmlDocument))
      rb_raise(rb_eArgError, "argument must be a Nokogiri::XML::Document");

    /* handle hashes as arguments. */
    if(T_HASH == TYPE(paramobj)) {
      paramobj = rb_funcall(paramobj, rb_intern("to_a"), 0);
      paramobj = rb_funcall(paramobj, rb_intern("flatten"), 0);
    }

    Check_Type(paramobj, T_ARRAY);

    Data_Get_Struct(xmldoc, xmlDoc, xml);
    Data_Get_Struct(self, nokogiriXsltStylesheetTuple, wrapper);

    param_len = RARRAY_LEN(paramobj);
    params = calloc((size_t)param_len+1, sizeof(char*));
    for (j = 0 ; j < param_len ; j++) {
      VALUE entry = rb_ary_entry(paramobj, j);
      const char * ptr = StringValueCStr(entry);
      params[j] = ptr;
    }
    params[param_len] = 0 ;

    errstr = rb_str_new(0, 0);
    xsltSetGenericErrorFunc((void *)errstr, xslt_generic_error_handler);
    xmlSetGenericErrorFunc((void *)errstr, xslt_generic_error_handler);

    result = xsltApplyStylesheet(wrapper->ss, xml, params);
    free(params);

    xsltSetGenericErrorFunc(NULL, NULL);
    xmlSetGenericErrorFunc(NULL, NULL);

    parse_error_occurred = (Qfalse == rb_funcall(errstr, rb_intern("empty?"), 0));

    if (parse_error_occurred) {
      exception = rb_exc_new3(rb_eRuntimeError, errstr);
      rb_exc_raise(exception);
    }

    return Nokogiri_wrap_xml_document((VALUE)0, result) ;
}