add option to check and warn or bail out on flowtext

Makefile

@@ -17,3 +17,9 @@ test_version:
 
 test_help:
 	PYTHONPATH=. python -m scour.scour --help
+
+test_error_on_flowtext:
+	# this is fine ..
+	PYTHONPATH=. scour --error-on-flowtext unittests/flowtext-less.svg /dev/null
+	# .. and this should bail out!
+	PYTHONPATH=. scour --error-on-flowtext unittests/flowtext.svg /dev/null

scour/scour.py

@@ -2880,6 +2880,14 @@ def scourString(in_string, options=None):
    global numBytesSavedInTransforms
    doc = xml.dom.minidom.parseString(in_string)
 
+   # determine number of flowRoot elements in input document
+   # flowRoot elements don't render at all on current browsers (04/2016)
+   cnt_flowText_el = len(doc.getElementsByTagName('flowRoot'))
+   if cnt_flowText_el:
+      print("SVG input document uses {} flow text elements, which won't render on browsers!".format(cnt_flowText_el))
+      if options.error_on_flowtext:
+         sys.exit(1)
+
    # remove <metadata> if the user wants to
    if options.remove_metadata:
       removeMetadataElements(doc)
@@ -3225,6 +3233,10 @@ _option_group_ids.add_option("--protect-ids-prefix",
    help="don't remove IDs starting with the given prefix")
 _options_parser.add_option_group(_option_group_ids)
 
+_option_group_compatibility = optparse.OptionGroup(_options_parser, "SVG compatibility checks")
+_option_group_compatibility.add_option("--error-on-flowtext",
+   action="store_true", dest="error_on_flowtext", default=False,
+   help="In case the input SVG uses flow text, bail out with error. Otherwise only warn. (default: False)")
 
 
 def maybe_gziped_file(filename, mode="r"):

unittests/flowtext-less.svg

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="210mm"
+   height="297mm"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.48.4 r9939"
+   sodipodi:docname="flowtext-less.svg">
+  <defs
+     id="defs4" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="0.35"
+     inkscape:cx="350"
+     inkscape:cy="520"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     inkscape:window-width="1559"
+     inkscape:window-height="876"
+     inkscape:window-x="41"
+     inkscape:window-y="24"
+     inkscape:window-maximized="1" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Ebene 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <text
+       xml:space="preserve"
+       style="font-size:40px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Sans"
+       x="142.85715"
+       y="638.07648"
+       id="text2997"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan2999"
+         x="142.85715"
+         y="638.07648">abcd</tspan></text>
+  </g>
+</svg>

unittests/flowtext.svg

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="210mm"
+   height="297mm"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.48.4 r9939"
+   sodipodi:docname="Neues Dokument 1">
+  <defs
+     id="defs4" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="0.35"
+     inkscape:cx="350"
+     inkscape:cy="520"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     inkscape:window-width="936"
+     inkscape:window-height="631"
+     inkscape:window-x="41"
+     inkscape:window-y="24"
+     inkscape:window-maximized="0" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Ebene 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <flowRoot
+       xml:space="preserve"
+       id="flowRoot2985"
+       style="font-size:40px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Sans"><flowRegion
+         id="flowRegion2987"><rect
+           id="rect2989"
+           width="480"
+           height="262.85715"
+           x="45.714287"
+           y="218.07646" /></flowRegion><flowPara
+         id="flowPara2991">sfdadasd</flowPara><flowPara
+         id="flowPara2993">asdasd</flowPara><flowPara
+         id="flowPara2995">adsa</flowPara></flowRoot>    <text
+       xml:space="preserve"
+       style="font-size:40px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Sans"
+       x="142.85715"
+       y="638.07648"
+       id="text2997"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan2999"
+         x="142.85715"
+         y="638.07648">abcd</tspan></text>
+  </g>
+</svg>