Added printing requirements

reportlab/pdfbase/_can_cmap_data.py

@@ -0,0 +1,60 @@
+#
+"""
+This is a utility to 'can' the widths data for certain CID fonts.
+Now we're using Unicode, we don't need 20 CMAP files for each Asian
+language, nor the widths of the non-normal characters encoded in each
+font.  we just want a dictionary of the character widths in a given
+font which are NOT 1000 ems wide, keyed on Unicode character (not CID).
+
+Running off CMAP files we get the following widths...::
+
+    >>> font = UnicodeCIDFont('HeiseiMin-W3')
+    >>> font.stringWidth(unicode(','), 10)
+    2.5
+    >>> font.stringWidth(unicode('m'), 10)
+    7.7800000000000002
+    >>> font.stringWidth(u'\u6771\u4EAC', 10)
+    20.0
+    >>> 
+
+"""
+
+from pprint import pprint as pp
+
+from reportlab.pdfbase._cidfontdata import defaultUnicodeEncodings
+from reportlab.pdfbase.cidfonts import UnicodeCIDFont
+
+
+def run():
+
+    buf = []
+    buf.append('widthsByUnichar = {}')
+    for fontName, (language, encName) in defaultUnicodeEncodings.items():
+        print('handling %s : %s : %s' % (fontName, language, encName))
+
+        #this does just about all of it for us, as all the info
+        #we need is present.
+        font = UnicodeCIDFont(fontName)
+
+        widthsByCID = font.face._explicitWidths
+        cmap = font.encoding._cmap
+        nonStandardWidthsByUnichar = {}
+        for codePoint, cid in cmap.items():
+            width = widthsByCID.get(cid, 1000)
+            if width != 1000:
+                nonStandardWidthsByUnichar[chr(codePoint)] = width
+        
+
+        
+        print('created font width map (%d items).  ' % len(nonStandardWidthsByUnichar))
+
+        buf.append('widthsByUnichar["%s"] = %s' % (fontName, repr(nonStandardWidthsByUnichar)))
+        
+        
+    src = '\n'.join(buf) + '\n'
+    open('canned_widths.py','w').write(src)
+    print('wrote canned_widths.py')
+
+if __name__=='__main__':
+    run()
+