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# Example program to show the new parsexml module
# This program reads an HTML file and writes all its used links to stdout.
# Errors and whitespace are ignored.
import os, streams, parsexml, strutils
proc `=?=` (a, b: string): bool =
# little trick: define our own comparator that ignores case
return cmpIgnoreCase(a, b) == 0
if paramCount() < 1:
quit("Usage: htmlrefs filename[.html]")
var links = 0 # count the number of links
var filename = addFileExt(ParamStr(1), "html")
var s = newFileStream(filename, fmRead)
if s == nil: quit("cannot open the file " & filename)
var x: TXmlParser
open(x, s, filename)
next(x) # get first event
block mainLoop:
while true:
case x.kind
of xmlElementOpen:
# the <a href = "xyz"> tag we are interested in always has an attribute,
# thus we search for ``xmlElementOpen`` and not for ``xmlElementStart``
if x.elementName =?= "a":
x.next()
if x.kind == xmlAttribute:
if x.attrKey =?= "href":
var link = x.attrValue
inc(links)
# skip until we have an ``xmlElementClose`` event
while true:
x.next()
case x.kind
of xmlEof: break mainLoop
of xmlElementClose: break
else: discard
x.next() # skip ``xmlElementClose``
# now we have the description for the ``a`` element
var desc = ""
while x.kind == xmlCharData:
desc.add(x.charData)
x.next()
Echo(desc & ": " & link)
else:
x.next()
of xmlEof: break # end of file reached
of xmlError:
Echo(errorMsg(x))
x.next()
else: x.next() # skip other events
echo($links & " link(s) found!")
x.close()
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