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Diffstat (limited to 'examples/urlExtractorNew.py')
-rw-r--r-- | examples/urlExtractorNew.py | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/examples/urlExtractorNew.py b/examples/urlExtractorNew.py new file mode 100644 index 0000000..0aac875 --- /dev/null +++ b/examples/urlExtractorNew.py @@ -0,0 +1,35 @@ +# URL extractor
+# Copyright 2004, Paul McGuire
+from pyparsing import Literal,Suppress,CharsNotIn,CaselessLiteral,\
+ Word,dblQuotedString,alphanums,SkipTo,makeHTMLTags
+import urllib.request, urllib.parse, urllib.error
+import pprint
+
+# Define the pyparsing grammar for a URL, that is:
+# URLlink ::= <a href= URL>linkText</a>
+# URL ::= doubleQuotedString | alphanumericWordPath
+# Note that whitespace may appear just about anywhere in the link. Note also
+# that it is not necessary to explicitly show this in the pyparsing grammar; by default,
+# pyparsing skips over whitespace between tokens.
+linkOpenTag,linkCloseTag = makeHTMLTags("a")
+link = linkOpenTag + SkipTo(linkCloseTag)("body") + linkCloseTag.suppress()
+
+# Go get some HTML with some links in it.
+serverListPage = urllib.request.urlopen( "http://www.google.com" )
+htmlText = serverListPage.read()
+serverListPage.close()
+
+# scanString is a generator that loops through the input htmlText, and for each
+# match yields the tokens and start and end locations (for this application, we are
+# not interested in the start and end values).
+for toks,strt,end in link.scanString(htmlText):
+ print(toks.startA.href,"->",toks.body)
+
+# Create dictionary from list comprehension, assembled from each pair of tokens returned
+# from a matched URL.
+pprint.pprint(
+ dict( [ (toks.body,toks.startA.href) for toks,strt,end in link.scanString(htmlText) ] )
+ )
+
+
+
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