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123 lines
4.4 KiB
123 lines
4.4 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
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<HTML>
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<HEAD>
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<TITLE>Mini-XML Programmers Manual, Version 2.2.1</TITLE>
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<META NAME="author" CONTENT="Michael Sweet">
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<META NAME="copyright" CONTENT="Copyright 2003-2005">
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=iso-iso-8859-1">
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<LINK REL="Start" HREF="index.html">
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<LINK REL="Contents" HREF="toc.html">
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<LINK REL="Prev" HREF="LoadCallbacks.html">
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<LINK REL="Next" HREF="CustomDataTypes.html">
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<STYLE TYPE="text/css"><!--
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BODY { font-family: serif }
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H1 { font-family: sans-serif }
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H2 { font-family: sans-serif }
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H3 { font-family: sans-serif }
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H4 { font-family: sans-serif }
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H5 { font-family: sans-serif }
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H6 { font-family: sans-serif }
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SUB { font-size: smaller }
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SUP { font-size: smaller }
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PRE { font-family: monospace }
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--></STYLE>
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</HEAD>
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<BODY>
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<A HREF="toc.html">Contents</A>
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<A HREF="LoadCallbacks.html">Previous</A>
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<A HREF="CustomDataTypes.html">Next</A>
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<HR NOSHADE>
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<H2><A name="SAVE_CALLBACKS">Save Callbacks</A></H2>
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<P><A href="#LOAD_XML">Chapter 2</A> also introduced the <A href="mxmlSaveFile.html#mxmlSaveFile">
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<TT>mxmlSaveFile()</TT></A>, <A href="mxmlSaveString.html#mxmlSaveString">
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<TT>mxmlSaveString()</TT></A>, and <A href="mxmlSaveAllocString.html#mxmlSaveAllocString">
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<TT>mxmlSaveAllocString()</TT></A> functions. The last argument to these
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functions is a callback function which is used to automatically insert
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whitespace in an XML document.</P>
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<P>Your callback function will be called up to four times for each
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element node with a pointer to the node and a "where" value of <TT>
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MXML_WS_BEFORE_OPEN</TT>, <TT>MXML_WS_AFTER_OPEN</TT>, <TT>
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MXML_WS_BEFORE_CLOSE</TT>, or <TT>MXML_WS_AFTER_CLOSE</TT>. The callback
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function should return <TT>NULL</TT> if no whitespace should be added
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and the string to insert (spaces, tabs, carriage returns, and newlines)
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otherwise. The following whitespace callback can be used to add
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whitespace to XHTML output to make it more readable in a standard text
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editor:</P>
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<!-- NEW PAGE -->
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<PRE>
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/*
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* 'whitespace_cb()' - Let the mxmlSaveFile() function know when to insert
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* newlines and tabs...
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*/
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const char * /* O - Whitespace string or NULL */
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whitespace_cb(mxml_node_t *node, /* I - Element node */
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int where) /* I - Open or close tag? */
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{
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const char *name; /* Name of element */
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/*
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* We can conditionally break to a new line before or after any element.
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* These are just common HTML elements...
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*/
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name = node->value.element.name;
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if (!strcmp(name, "html") || !strcmp(name, "head") || !strcmp(name, "body") ||
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!strcmp(name, "pre") || !strcmp(name, "p") ||
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!strcmp(name, "h1") || !strcmp(name, "h2") || !strcmp(name, "h3") ||
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!strcmp(name, "h4") || !strcmp(name, "h5") || !strcmp(name, "h6"))
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{
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/*
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* Newlines before open and after close...
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*/
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if (where == MXML_WS_BEFORE_OPEN || where == MXML_WS_AFTER_CLOSE)
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return ("\n");
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}
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else if (!strcmp(name, "dl") || !strcmp(name, "ol") || !strcmp(name, "ul"))
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{
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/*
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* Put a newline before and after list elements...
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*/
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return ("\n");
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}
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else if (!strcmp(name, "dd") || !strcmp(name, "dt") || !strcmp(name, "li"))
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{
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/*
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* Put a tab before <li>'s, <dd>'s, and <dt>'s, and a newline after them...
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*/
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if (where == MXML_WS_BEFORE_OPEN)
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return ("\t");
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else if (where == MXML_WS_AFTER_CLOSE)
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return ("\n");
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}
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/*
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* Return NULL for no added whitespace...
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*/
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return (NULL);
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}
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</PRE>
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<!-- NEW PAGE -->
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<P>To use this callback function, simply use the name when you call any
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of the save functions:</P>
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<PRE>
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FILE *fp;
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<A href="mxmlnodet.html#mxml_node_t">mxml_node_t</A> *tree;
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fp = fopen("filename.xml", "w");
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<A href="mxmlSaveFile.html#mxmlSaveFile">mxmlSaveFile</A>(tree, fp, whitespace_cb);
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fclose(fp);
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</PRE>
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<HR NOSHADE>
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<A HREF="toc.html">Contents</A>
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<A HREF="LoadCallbacks.html">Previous</A>
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<A HREF="CustomDataTypes.html">Next</A>
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</BODY>
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</HTML>
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