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XmlExplodeTag.java

/* {{{ License.
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
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 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */ //}}}

// :indentSize=4:lineSeparator=\n:noTabs=false:tabSize=4:folding=explicit:collapseFolds=0:

package org.mathpiper.builtin.functions.core;

import org.mathpiper.builtin.BuiltinFunction;
import org.mathpiper.lisp.cons.AtomCons;
import org.mathpiper.lisp.cons.Cons;
import org.mathpiper.lisp.Environment;
import org.mathpiper.lisp.LispError;
import org.mathpiper.lisp.cons.ConsPointer;
import org.mathpiper.lisp.cons.SublistCons;
import org.mathpiper.lisp.tokenizers.MathPiperTokenizer;

/**
 *
 *  
 */
public class XmlExplodeTag extends BuiltinFunction
{

    public void evaluate(Environment aEnvironment, int aStackTop) throws Exception
    {
        ConsPointer out = new ConsPointer();
        out.setCons(getArgumentPointer(aEnvironment, aStackTop, 1).getCons());
        LispError.checkIsString(aEnvironment, aStackTop, out, 1);

        String str = (String) out.car();
        int strInd = 0;
        strInd++;
        if (str.charAt(strInd) != '<')
        {
            getTopOfStackPointer(aEnvironment, aStackTop).setCons(out.getCons());
            return;
        }
        LispError.checkArgument(aEnvironment, aStackTop, str.charAt(strInd) == '<', 1);
        strInd++;
        String type = "\"Open\"";

        if (str.charAt(strInd) == '/')
        {
            type = "\"Close\"";
            strInd++;
        }
        String tag = new String();

        tag = tag + "\"";
        while (MathPiperTokenizer.isAlpha(str.charAt(strInd)))
        {
            char c = str.charAt(strInd);
            strInd++;
            if (c >= 'a' && c <= 'z')
            {
                c = (char) (c + ('A' - 'a'));
            }
            tag = tag + c;
        }
        tag = tag + "\"";

        Cons info = null;

        while (str.charAt(strInd) == ' ')
        {
            strInd++;
        }
        while (str.charAt(strInd) != '>' && str.charAt(strInd) != '/')
        {
            String name = new String();
            name = name + "\"";

            while (MathPiperTokenizer.isAlpha(str.charAt(strInd)))
            {
                char c = str.charAt(strInd);
                strInd++;
                if (c >= 'a' && c <= 'z')
                {
                    c = (char) (c + ('A' - 'a'));
                }
                name = name + c;
            }
            name = name + "\"";
            LispError.checkArgument(aEnvironment, aStackTop, str.charAt(strInd) == '=', 1);
            strInd++;
            LispError.checkArgument(aEnvironment, aStackTop, str.charAt(strInd) == '\"', 1);
            String value = new String();

            value = value + (str.charAt(strInd));
            strInd++;
            while (str.charAt(strInd) != '\"')
            {
                value = value + (str.charAt(strInd));
                strInd++;
            }
            value = value + (str.charAt(strInd));
            strInd++;

            //printf("[%s], [%s]\n",name.String(),value.String());
            {
                Cons ls = AtomCons.getInstance(aEnvironment, "List");
                Cons nm = AtomCons.getInstance(aEnvironment, name);
                Cons vl = AtomCons.getInstance(aEnvironment, value);
                nm.cdr().setCons(vl);
                ls.cdr().setCons(nm);
                Cons newinfo = SublistCons.getInstance(aEnvironment, ls);
                newinfo.cdr().setCons(info);
                info = newinfo;
            }
            while (str.charAt(strInd) == ' ')
            {
                strInd++;

            //printf("End is %c\n",str[0]);
            }
        }
        if (str.charAt(strInd) == '/')
        {
            type = "\"OpenClose\"";
            strInd++;
            while (str.charAt(strInd) == ' ')
            {
                strInd++;
            }
        }
        {
            Cons ls = AtomCons.getInstance(aEnvironment, "List");
            ls.cdr().setCons(info);
            info = SublistCons.getInstance(aEnvironment, ls);
        }

        Cons xm = AtomCons.getInstance(aEnvironment, "XmlTag");
        Cons tg = AtomCons.getInstance(aEnvironment, tag);
        Cons tp = AtomCons.getInstance(aEnvironment, type);
        info.cdr().setCons(tp);
        tg.cdr().setCons(info);
        xm.cdr().setCons(tg);
        getTopOfStackPointer(aEnvironment, aStackTop).setCons(SublistCons.getInstance(aEnvironment, xm));

    }
}



/*
%mathpiper_docs,name="XmlExplodeTag",categories="User Functions;Input/Output;Built In"
*CMD XmlExplodeTag --- convert XML strings to tag objects
*CORE
*CALL
      XmlExplodeTag(xmltext)
*PARMS

{xmltext} -- string containing some XML tokens

*DESC

{XmlExplodeTag} parses the car XML token in {xmltext}
and returns a MathPiper expression.

The following subset of XML syntax is supported currently:

*     {<TAG [options]>} -- an opening tag
*     {</TAG [options]>} -- a closing tag
*     {<TAG [options] />} -- an open/close tag
*     plain (non-tag) text

The tag options take the form {paramname="value"}.

If given an XML tag, {XmlExplodeTag} returns a structure of the form {XmlTag(name,params,type)}.
In the returned object,
{name} is the (capitalized) tag name, {params} is an assoc list with
the options (key fields capitalized), and type can be either "Open", "Close" or "OpenClose".

If given a plain text string, the same string is returned.


*E.G.
      In> XmlExplodeTag("some plain text")
      Out> "some plain text";
      In> XmlExplodeTag("<a name=\"blah blah\"
        align=\"left\">")
      Out> XmlTag("A",{{"ALIGN","left"},
        {"NAME","blah blah"}},"Open");
      In> XmlExplodeTag("</p>")
      Out> XmlTag("P",{},"Close");
      In> XmlExplodeTag("<br/>")
      Out> XmlTag("BR",{},"OpenClose");

*SEE XmlTokenizer
%/mathpiper_docs
*/

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