fix bug [ 1685070 ] PathAlongPath - Error message when no paths selected

[inkscape.git] / share / extensions / inkex.py

diff --git a/share/extensions/inkex.py b/share/extensions/inkex.py
index b8bba3803860d9d3b74154709d3768f91da4ba1b..8be7b5282869fa4355d7ae6d30a28730a68d0a25 100755 (executable)
--- a/share/extensions/inkex.py
+++ b/share/extensions/inkex.py
@@ -19,7 +19,7 @@ You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 """
-import sys, copy, optparse
+import sys, copy, optparse, random, re
 
 #a dictionary of all of the xmlns prefixes in a standard inkscape doc
 NSS = {
@@ -32,8 +32,29 @@ u'inkscape'    :u'http://www.inkscape.org/namespaces/inkscape',
 u'xlink'    :u'http://www.w3.org/1999/xlink'
 }
 
+#a dictionary of unit to user unit conversion factors
+uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'pc':15.0}
+def unittouu(string):
+    '''Returns userunits given a string representation of units in another system'''
+    unit = re.compile('(%s)$' % '|'.join(uuconv.keys()))
+    param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
+
+    p = param.match(string)
+    u = unit.search(string)    
+    if p:
+        retval = float(p.string[p.start():p.end()])
+    else:
+        retval = 0.0
+    if u:
+        try:
+            return retval * uuconv[u.string[u.start():u.end()]]
+        except KeyError:
+            pass
+    return retval
+
 try:
     import xml.dom.ext
+    import xml.dom.minidom
     import xml.dom.ext.reader.Sax2
     import xml.xpath
 except:
@@ -59,11 +80,15 @@ class InkOption(optparse.Option):
 
 class Effect:
     """A class for creating Inkscape SVG Effects"""
-    def __init__(self):
+    def __init__(self, *args, **kwargs):
+        self.id_characters = '0123456789abcdefghijklmnopqrstuvwkyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
         self.document=None
+        self.ctx=None
         self.selected={}
+        self.doc_ids={}
         self.options=None
         self.args=None
+        self.use_minidom=kwargs.pop("use_minidom", False)
         self.OptionParser = optparse.OptionParser(usage="usage: %prog [options] SVGfile",option_class=InkOption)
         self.OptionParser.add_option("--id",
                         action="append", type="string", dest="ids", default=[], 
@@ -83,14 +108,43 @@ class Effect:
                 stream = open(self.args[-1],'r')
         except:
             stream = sys.stdin
-        self.document = reader.fromStream(stream)
+        if self.use_minidom:
+            self.document = xml.dom.minidom.parse(stream)
+        else:
+            self.document = reader.fromStream(stream)
+        self.ctx = xml.xpath.Context.Context(self.document,processorNss=NSS)
         stream.close()
+    def getposinlayer(self):
+        ctx = xml.xpath.Context.Context(self.document,processorNss=NSS)
+        #defaults
+        self.current_layer = self.document.documentElement
+        self.view_center = (0.0,0.0)
+
+        layerattr = xml.xpath.Evaluate('//sodipodi:namedview/@inkscape:current-layer',self.document,context=ctx)
+        if layerattr:
+            layername = layerattr[0].value
+            layer = xml.xpath.Evaluate('//g[@id="%s"]' % layername,self.document,context=ctx)
+            if layer:
+                self.current_layer = layer[0]
+
+        xattr = xml.xpath.Evaluate('//sodipodi:namedview/@inkscape:cx',self.document,context=ctx)
+        yattr = xml.xpath.Evaluate('//sodipodi:namedview/@inkscape:cy',self.document,context=ctx)
+        doc_height = unittouu(self.document.documentElement.getAttribute('height'))
+        if xattr and yattr:
+            x = xattr[0].value
+            y = yattr[0].value
+            if x and y:
+                self.view_center = (float(x), doc_height - float(y)) # FIXME: y-coordinate flip, eliminate it when it's gone in Inkscape
     def getselected(self):
         """Collect selected nodes"""
         for id in self.options.ids:
             path = '//*[@id="%s"]' % id
             for node in xml.xpath.Evaluate(path,self.document):
                 self.selected[id] = node
+    def getdocids(self):
+        docIdNodes = xml.xpath.Evaluate('//@id',self.document,context=self.ctx)
+        for m in docIdNodes:
+            self.doc_ids[m.value] = 1
     def output(self):
         """Serialize document into XML on stdout"""
         xml.dom.ext.Print(self.document)
@@ -98,6 +152,24 @@ class Effect:
         """Affect an SVG document with a callback effect"""
         self.getoptions()
         self.parse()
+        self.getposinlayer()
         self.getselected()
+        self.getdocids()
         self.effect()
         self.output()
+        
+    def uniqueId(self, old_id, make_new_id = True):
+        new_id = old_id
+        if make_new_id:
+            while new_id in self.doc_ids:
+                new_id = "%s%s" % (new_id,random.choice(self.id_characters))
+            self.doc_ids[new_id] = 1
+        return new_id
+    def xpathSingle(self, path):
+        try:
+            retval = xml.xpath.Evaluate(path,self.document,context=self.ctx)[0]
+        except:
+            debug("No matching node for expression: %s" % path)
+            retval = None
+        return retval
+