refactor svgtemplate into seperate file

svgtemplate.py

@@ -0,0 +1,43 @@
+# vim: tabstop=4 shiftwidth=4 expandtab
+import builtins
+import cssutils
+import os
+from lxml import etree
+from xml.sax.saxutils import escape as xmlescape
+
+def open(task):
+    with builtins.open(os.path.join(task.workdir, task.infile), 'r') as fp:
+        return fp.read()
+
+def replacetext(svgstr, task):
+    for key in task.parameters.keys():
+        svgstr = svgstr.replace(key, xmlescape(str(task.parameters[key])))
+    return svgstr
+
+def transform(svgstr, frame, task):
+    parser = etree.XMLParser(huge_tree=True)
+    svg = etree.fromstring(svgstr.encode('utf-8'), parser)
+    # apply the replace-pairs to the input text, by finding the specified xml-elements by their id and modify their css-parameter the correct value
+    for replaceinfo in frame:
+        (id, type, key, value) = replaceinfo
+        for el in svg.findall(".//*[@id='" + id.replace("'", "\\'") + "']"):
+            if type == 'style':
+                style = cssutils.parseStyle(el.attrib['style'] if 'style' in el.attrib else '')
+                style[key] = str(value)
+                el.attrib['style'] = style.cssText
+            elif type == 'attr':
+                el.attrib[key] = str(value)
+            elif type == 'text':
+                el.text = str(value)
+    # if '$subtitle' in task.parameters and task.parameters['$subtitle'] == '':
+    #   child = svg.findall(".//*[@id='subtitle']")[0]
+    #   child.getparent().remove(child)
+    return etree.tostring(svg, encoding='unicode')
+
+def write(svgstr, task):
+    # open the output-file (named ".gen.svg" in the workdir)
+    outfile = os.path.join(task.workdir, '.gen.svg')
+    with builtins.open(outfile, 'w') as fp:
+        # write the generated svg-text into the output-file
+        fp.write(svgstr)
+    return outfile