{"id":1395,"date":"2018-01-19T19:22:47","date_gmt":"2018-01-19T19:22:47","guid":{"rendered":"http:\/\/goofy-trucks.flywheelsites.com\/dynamic-xml-conversion-using-the-sax-parser-page-3\/"},"modified":"2018-01-19T19:24:45","modified_gmt":"2018-01-19T19:24:45","slug":"dynamic-xml-conversion-using-the-sax-parser-page-3","status":"publish","type":"post","link":"https:\/\/phpbuilder.com\/dynamic-xml-conversion-using-the-sax-parser-page-3\/","title":{"rendered":"Dynamic XML Conversion Using the SAX Parser Page 3"},"content":{"rendered":"
\n
\n
By PHP Builder Staff<\/div>\n
on April 28, 2003<\/div>\n<\/p><\/div>\n
\n

Creating the conversion functions<\/h2>\n
\nEach conversion function has two arguments: <\/div>\n
\n
    \n
  1. $contents<\/code>: The character data between the opening and closing tag.
    \nThis can include text, HTML tags and the output of conversion functions for tags nested between the
    \ncurrently processed. The function should include this in its return value.<\/li>\n
  2. $attrs<\/code>: An array containing the attributes of the tag. Note that the EXPAT parser
    \nautomatically changes the attribute names to uppercase.<\/li>\n<\/ol>\n<\/div>\n
    So the function to handle this tag: <font face=”bold”>blah<\/font>
    \nreceives these attributes:<\/div>\n
    \n<\/p>\n

    <?php
    \n
    $contents<\/span>=<\/span>'blah'<\/span>;
    \n
    <\/span>$attrs<\/span>=array(<\/span>'FACE'<\/span>=><\/span>'bold'<\/span>);\u00a0
    \n
    <\/span>?>
    \n
    <\/span>
    \n<\/span>
    \n<\/code><\/font><\/div>\n

    Here is an example conversion function: <\/div>\n
    \n<\/p>\n

    <?php
    \n
    <\/span>function\u00a0<\/span>handle_bigheadline<\/span>(<\/span>$contents<\/span>,<\/span>$attrs<\/span>)\u00a0{
    \n
    \u00a0\u00a0\u00a0\u00a0return(<\/span>'<b><font\u00a0size=\"5\"\u00a0face=\"Verdana\">'<\/span>.<\/span>$contents<\/span>.<\/span>'<\/font><\/b>'<\/span>);
    \n
    }
    \n
    <\/span>
    \n<\/span>
    \n<\/code><\/font><\/div>\n

    \nThe function wraps the contents it receives into some HTML to make it look like a headline.
    \nIt then returns this modified content to the conversion framework, which uses it as part of the
    \ncontents parameter for the function that converts the tag surrounding it.\n<\/div>\n
    \nHere is the function to convert the <dayofweek \/> – tag:\n<\/div>\n
    \n<\/p>\n

    <?php
    \n
    <\/span>function\u00a0<\/span>handle_dayofweek<\/span>(<\/span>$contents<\/span>,<\/span>$attrs<\/span>)\u00a0{
    \n
    \u00a0\u00a0\u00a0\u00a0return(<\/span>date<\/span>(<\/span>\"l\"<\/span>));
    \n
    }
    \n
    <\/span>?>
    \n
    <\/span>
    \n<\/span>
    \n<\/code><\/font><\/div>\n

    \nThe function ignores the contents and attributes which are passed and just returns the name of the current
    \nweekday. So if you put some stuff between -Tags, it would never show up in the converted HTML.
    \n<\/dayoweek><\/div>\n
    \nBuilding the Conversion Framework<\/div>\n
    \nAs mentioned before, we will use the SAX parser to build the conversion framework.
    \nSAX is an event based parser. It works like this:
    \nIt chops up the document into elements. There are three element types: Start tags, end tags and character data. (Actually there are some more, but we won’t need them in this example.)
    \nThen for each element it encounters in the document, the parser calls a function assigned to the element type.\n<\/div>\n
    \nThe element handling functions receive these parameters:<\/div>\n
    \n\n\n\n\n\n
    \nFunction<\/th>\nParameters<\/th>\n<\/tr>\n
    Opening Tag<\/td>\nName of the tag, array containing its attributes<\/td>\n<\/tr>\n
    Character data\t<\/td>\nA string containing the characters<\/td>\n<\/tr>\n
    Closing Tag<\/td>\nName of the tag<\/td>\n<\/tr>\n<\/table>\n<\/div>\n
    \nWe want to combine these three functions, so that we can use the attribute data to handle the contents data.
    \nOur conversion functions will be called when the parser encounters a closing tag.\n<\/div>\n
    \n
      \n
    1. An array containing the attributes of the tag (the SAX parser passes this to the opening tag function) <\/li>\n
    2. \nThe character data between the opening and closing tag (can contain the output of conversion functions
      \nfor other tags nested between these tags)\n<\/li>\n<\/ol>\n<\/div>\n
      \nWe will have to think up a way to store these values when we receive them so that we have them at hand when the
      \nparser encounters the closing tag.\n<\/div>\n<\/div>\n

      <\/p>\n

      \n
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      This article describes an alternative way of converting XML to HTML using the SAX parser. For each tag you<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1395","post","type-post","status-publish","format-standard","hentry","category-tutorials"],"_links":{"self":[{"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/posts\/1395","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/comments?post=1395"}],"version-history":[{"count":1,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/posts\/1395\/revisions"}],"predecessor-version":[{"id":3265,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/posts\/1395\/revisions\/3265"}],"wp:attachment":[{"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/media?parent=1395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/categories?post=1395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phpbuilder.com\/wp-json\/wp\/v2\/tags?post=1395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}