make 'koch web' work again

lib/pure/parsecfg.nim

@@ -17,12 +17,37 @@
 ##
 ## .. include:: ../../doc/mytest.cfg
 ##     :literal:
-## The file ``examples/parsecfgex.nim`` demonstrates how to use the
-## configuration file parser:
-##
-## .. code-block:: nim
-##     :file: ../../examples/parsecfgex.nim
 ##
+
+##[ Here is an example of how to use the configuration file parser:
+
+.. code-block:: nim
+
+    import
+      os, parsecfg, strutils, streams
+
+    var f = newFileStream(paramStr(1), fmRead)
+    if f != nil:
+      var p: CfgParser
+      open(p, f, paramStr(1))
+      while true:
+        var e = next(p)
+        case e.kind
+        of cfgEof: break
+        of cfgSectionStart:   ## a ``[section]`` has been parsed
+          echo("new section: " & e.section)
+        of cfgKeyValuePair:
+          echo("key-value-pair: " & e.key & ": " & e.value)
+        of cfgOption:
+          echo("command: " & e.key & ": " & e.value)
+        of cfgError:
+          echo(e.msg)
+      close(p)
+    else:
+      echo("cannot open: " & paramStr(1))
+
+]##
+
 ## Examples
 ## --------
 ##

lib/pure/parsexml.nim

@@ -26,27 +26,125 @@
 ##   creates.
 ##
 ##
-## Example 1: Retrieve HTML title
+
-## ==============================
+##[
-##
+
-## The file ``examples/htmltitle.nim`` demonstrates how to use the
+Example 1: Retrieve HTML title
-## XML parser to accomplish a simple task: To determine the title of an HTML
+==============================
-## document.
+
-##
+The file ``examples/htmltitle.nim`` demonstrates how to use the
-## .. code-block:: nim
+XML parser to accomplish a simple task: To determine the title of an HTML
-##     :file: ../../examples/htmltitle.nim
+document.
-##
+
-##
+.. code-block:: nim
-## Example 2: Retrieve all HTML links
+
-## ==================================
+    # Example program to show the parsexml module
-##
+    # This program reads an HTML file and writes its title to stdout.
-## The file ``examples/htmlrefs.nim`` demonstrates how to use the
+    # Errors and whitespace are ignored.
-## XML parser to accomplish another simple task: To determine all the links
+
-## an HTML document contains.
+    import os, streams, parsexml, strutils
-##
+
-## .. code-block:: nim
+    if paramCount() < 1:
-##     :file: ../../examples/htmlrefs.nim
+      quit("Usage: htmltitle filename[.html]")
-##
+
+    var filename = addFileExt(paramStr(1), "html")
+    var s = newFileStream(filename, fmRead)
+    if s == nil: quit("cannot open the file " & filename)
+    var x: XmlParser
+    open(x, s, filename)
+    while true:
+      x.next()
+      case x.kind
+      of xmlElementStart:
+        if cmpIgnoreCase(x.elementName, "title") == 0:
+          var title = ""
+          x.next()  # skip "<title>"
+          while x.kind == xmlCharData:
+            title.add(x.charData)
+            x.next()
+          if x.kind == xmlElementEnd and cmpIgnoreCase(x.elementName, "title") == 0:
+            echo("Title: " & title)
+            quit(0) # Success!
+          else:
+            echo(x.errorMsgExpected("/title"))
+
+      of xmlEof: break # end of file reached
+      else: discard # ignore other events
+
+    x.close()
+    quit("Could not determine title!")
+
+]##
+
+##[
+
+Example 2: Retrieve all HTML links
+==================================
+
+The file ``examples/htmlrefs.nim`` demonstrates how to use the
+XML parser to accomplish another simple task: To determine all the links
+an HTML document contains.
+
+.. code-block:: nim
+
+    # 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: XmlParser
+    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()
+
+]##
 
 import
   hashes, strutils, lexbase, streams, unicode