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path: root/support/meper/src/EditorFilter.java
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/* EditorFilter.java
 * This file is part of source files of MEPer.
 * It defines the behaviors of the editor.
 * 
 * @author Shengjun Pan
*/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import java.util.*;
import javax.swing.undo.*;

public class EditorFilter extends DocumentFilter {

    String[] keywords ={"beginfig","endfig","for","draw","drawarrow","endfor",
                        "def", "vardef", "enddef","if", "fi", "withcolor","fill",
			"shifted", "scaled", "rotated", "withpen"};
    String[] datatypes = {"picture","numeric","path","pair","transform","color",
                          "string", "boolean", "pen"};

    int fontSize = 14;
    HashMap<String,SimpleAttributeSet> tokenToAset;
    JTextPane editor;
    JButton saveButton;

    public EditorFilter(JTextPane ed, JButton sb) {

        editor = ed;
        saveButton = sb;

        tokenToAset = new HashMap<String,SimpleAttributeSet>();

        SimpleAttributeSet aset= new SimpleAttributeSet();
        StyleConstants.setForeground(aset, Color.BLUE);
        StyleConstants.setBold(aset, true);
        StyleConstants.setFontSize(aset,fontSize);
        tokenToAset.put("keyword", aset);

        aset= new SimpleAttributeSet();
        StyleConstants.setForeground(aset, Color.GREEN);
        StyleConstants.setBold(aset, true);
        StyleConstants.setFontSize(aset,fontSize);
        tokenToAset.put("digits", aset);
        
        aset= new SimpleAttributeSet();
        StyleConstants.setForeground(aset, Color.BLACK);
        StyleConstants.setBold(aset, false);
        StyleConstants.setFontSize(aset,fontSize);
        tokenToAset.put("normal", aset);

        aset= new SimpleAttributeSet();
        StyleConstants.setForeground(aset, Color.GREEN);
        StyleConstants.setBold(aset, true);
        StyleConstants.setFontSize(aset,fontSize);
        tokenToAset.put("datatype", aset);

        aset= new SimpleAttributeSet();
        StyleConstants.setForeground(aset, Color.MAGENTA);
        StyleConstants.setBold(aset, true);
        StyleConstants.setFontSize(aset,fontSize);
        tokenToAset.put("quoted", aset);

        //editor.addKeyListener(this);
        editor.setFont(new Font(Font.MONOSPACED,Font.PLAIN,fontSize));

        // enable undo/redo
        final UndoManager undoManager = new UndoManager();
        editor.getDocument().addUndoableEditListener(undoManager);
        editor.getInputMap().put(KeyStroke.getKeyStroke("ctrl Z"), "undo");
        editor.getActionMap().put("undo", new AbstractAction() {
                public void actionPerformed(ActionEvent evt) {
                    try { undoManager.undo();}
                    catch (Throwable t) {Toolkit.getDefaultToolkit().beep();}
                }});
        editor.getInputMap().put(KeyStroke.getKeyStroke("ctrl R"), "redo");
        editor.getActionMap().put("redo", new AbstractAction() {
                public void actionPerformed(ActionEvent evt) {
                    try { undoManager.redo();}
                    catch (Throwable t) {Toolkit.getDefaultToolkit().beep();}
                }});

    }

    @Override
    public void insertString(FilterBypass fb, int offs,
                         String str, AttributeSet a)
        throws BadLocationException {
        saveButton.setEnabled(true);
        highlightAndInsert(fb, offs, str);
    }
    
    @Override
    public void replace(DocumentFilter.FilterBypass fb, int offs, int len,
        String str, AttributeSet a) throws BadLocationException {
        saveButton.setEnabled(true);
        super.remove(fb, offs, len);
        highlightAndInsert(fb,offs,str);
    }

    @Override
    public void remove(DocumentFilter.FilterBypass fb, int offs, int len)
    throws BadLocationException {
        saveButton.setEnabled(true);
        boolean removingWhite = fb.getDocument().getText(offs, len).trim().isEmpty();

        super.remove(fb, offs, len);
        String indent = "";
        String smallerIndent ="";
        try {
            indent = indent(offs,false);
            smallerIndent = indent(offs,true);
            int newLineOffs = offs - indent.length()-1;
            String maybeNewline=newLineOffs<0?"":editor.getDocument().getText(newLineOffs, 1);
            if(removingWhite && indent.length()>0 && (maybeNewline.isEmpty() || maybeNewline.equals("\n"))){
                super.remove(fb,newLineOffs+1, indent.length());
                super.insertString(fb,newLineOffs+1,smallerIndent, tokenToAset.get("normal"));
            } else if(offs>0) { highlightAndInsert(fb,offs,"");}
        } catch(Throwable t) {}
    }
   
   private void highlightAndInsert(FilterBypass fb, int offs, String str)
           throws BadLocationException {

       // invoke automatical indentation only if a single <ENTER> is received.
       // In the case of pasting multiple lines, the original indentation
       // should be reserved.
       if(str.length()==1 && str.charAt(0)=='\n') {
                String indent = "";
                try {
                    indent = indent(offs,false);
                    super.insertString(fb,offs, "\n"+indent, tokenToAset.get("normal"));
                } catch(Throwable t) {}
                return;
       }
 
       //translate
       String newstr="";
       for(int i=0;i<str.length(); i++){
           char c= str.charAt(i);
           switch(c) {
           case '\t':
           {
               newstr += "    ";
               break;
           }
           default:
               newstr += c;
            }
       }

        String prefix, suffix;
       // search for partial word before
        int from=offs;
        if (newstr.isEmpty() || !Character.isWhitespace(newstr.charAt(0))){
            from --;
            while(from >=0 ) {
                char c = fb.getDocument().getText(from, 1).charAt(0);
                if(Character.isWhitespace(c)){ break;}
                from--;
            }
            from ++;
        }
        prefix = fb.getDocument().getText(from, offs-from);

        // search for partial word after
        int to=offs;
        if (newstr.isEmpty() || !Character.isWhitespace(newstr.charAt(newstr.length()-1))){
            int wholeLen = fb.getDocument().getLength();
            while(to < wholeLen) {
                char c = fb.getDocument().getText(to,1).charAt(0);
                if(Character.isWhitespace(c)){break;}
                to++;
            }
        }
        suffix = fb.getDocument().getText(offs,to-offs);

        // removing the partial words
        offs -= prefix.length();
        super.remove(fb, offs, prefix.length()+suffix.length());


        String[] words = newstr.split(" ",-1);
        words[0] = prefix + words[0];
        words[words.length-1] += suffix;


        newstr = prefix + newstr + suffix;
        String state="normal";
        if(offs>0){
            Color fgcolor=StyleConstants.getForeground(editor.getStyledDocument().getCharacterElement(offs-1).getAttributes());
            if (fgcolor.equals(StyleConstants.getForeground(tokenToAset.get("quoted"))))
                state = "quoted";
        }

        String token="";
        char c;
        newstr += '\0';
        for(int i=0;i< newstr.length();i++){
            c = newstr.charAt(i);
            String newstate="normal";
            if(c=='\0') newstate = "done";
            else if(state.equals("quoted")|| state.equals("lquote")) newstate= (c=='\"')? "rquote":"quoted";
            else if(Character.isDigit(c)) newstate = "digits";
            else if(Character.isLetter(c)) newstate = "word";
            else if(c=='\"') newstate= "lquote";

            if (!state.equals(newstate)) {
                String key="normal";
                if(state.equals("digits")) key="digits";
                else if(state.equals("word") && isKeyword(token)) key="keyword";
                else if(state.equals("word") && isDatatype(token)) key="datatype";
                else if(state.equals("quoted")) key="quoted";

                super.insertString(fb, offs, token, tokenToAset.get(key));
                offs += token.length();
                state = newstate;
                token = "";
            }
            token +=c;
        }

      editor.setCaretPosition(offs-suffix.length());
    }

   // return the indent (as string of whitespaces) of the current line
   // or closest shorter indent of previous lines if 'wantShorter' is true.
  private String indent(int offs, boolean wantShorter) throws BadLocationException {
       int pos=offs-1;
       int pos_firstNonWhite = offs;
       int firstIndentSize=-1;
       while(pos>=0){
           char ch= editor.getText(pos, 1).charAt(0);
           if(ch=='\n') {
               int previousIndentSize = pos_firstNonWhite-pos-1;
               if(!wantShorter || previousIndentSize < firstIndentSize) break;
               if(firstIndentSize<0)  firstIndentSize = previousIndentSize;
               pos_firstNonWhite = pos;
           }
           if(!Character.isWhitespace(ch)) {
               pos_firstNonWhite = pos;
           }
           pos --;
       }
       return editor.getText(pos+1, pos_firstNonWhite-pos-1);
   }

   private boolean isKeyword(String word) {
        for(int i=0;i<keywords.length;i++)
            if(keywords[i].equals(word))
                    return true;
        return false;
   }
   private boolean isDatatype(String word) {
        for(int i=0;i<datatypes.length;i++)
            if(datatypes[i].equals(word))
                    return true;
        return false;
   }
}