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/*
 * Copyright (c) 1999 World Wide Web Consortium
 * (Massachusetts Institute of Technology, Institut National de Recherche
 *  en Informatique et en Automatique, Keio University).
 * All Rights Reserved. http://www.w3.org/Consortium/Legal/
 *
 * $Id: LexicalUnitImpl.java,v 1.3 2000/02/15 02:08:19 plehegar Exp $
 */
package org.w3c.flute.parser;

import org.w3c.css.sac.LexicalUnit;

/**
 * @version $Revision: 1.3 $
 * @author  Philippe Le Hegaret
 */
class LexicalUnitImpl implements LexicalUnit {

    LexicalUnit prev;
    LexicalUnit next;

    short type;
    int line;
    int column;

    int i;
    float  f;
    short  dimension;
    String sdimension;
    String s;
    String fname;
    LexicalUnitImpl params;

    LexicalUnitImpl(short type, int line, int column, LexicalUnitImpl p) { 
	if (p != null) {
	    prev = p;
	    p.next = this;
	}
	this.line = line;
	this.column = column -1;
	this.type = type;
    }

    LexicalUnitImpl(int line, int column, LexicalUnitImpl previous, int i) {
        this(SAC_INTEGER, line, column, previous);
        this.i = i;
    }

    LexicalUnitImpl(int line, int column, LexicalUnitImpl previous,
		    short dimension, String sdimension, float f) {
        this(dimension, line, column, previous);
        this.f = f;
        this.dimension = dimension;
        this.sdimension = sdimension;
    }    

    LexicalUnitImpl(int line, int column, LexicalUnitImpl previous,
		    short type, String s) {
        this(type, line, column, previous);
        this.s = s;
    }

    LexicalUnitImpl(short type, int line, int column,
		    LexicalUnitImpl previous, String fname, 
		    LexicalUnitImpl params) {
        this(type, line, column, previous);
        this.fname = fname;
        this.params = params;
    }    

    

    public int getLineNumber() {
	return line;
    }

    public int getColumnNumber() {
	return column;
    }

    public short getLexicalUnitType() {
	return type;
    }

    public LexicalUnit getNextLexicalUnit() {
	return next;
    }

    public LexicalUnit getPreviousLexicalUnit() {
	return prev;
    }

    public int getIntegerValue() {
        return i;
    }

    void setIntegerValue(int i) {
        this.i = i;
    }     
    
    public float getFloatValue() {
        return f;
    }
    
    void setFloatValue(float f) {
        this.f = f;
    }

    public String getDimensionUnitText() {
        switch (type) {
        case SAC_PERCENTAGE:
            return "%";
        case SAC_EM:
            return "em";
        case SAC_EX:
            return "ex";
        case SAC_PIXEL:
            return "px";
        case SAC_CENTIMETER:
            return "cm";
        case SAC_MILLIMETER:
            return "mm";
        case SAC_INCH:
            return "in";
        case SAC_POINT:
            return "pt";
        case SAC_PICA:
            return "pc";
        case SAC_DEGREE:
            return "deg";
        case SAC_RADIAN:
            return "rad";
        case SAC_GRADIAN:
            return "grad";
        case SAC_MILLISECOND:
            return "ms";
        case SAC_SECOND:
            return "s";
        case SAC_HERTZ:
            return "Hz";
        case SAC_KILOHERTZ:
            return "kHz";
        case SAC_DIMENSION:
            return sdimension;
        default:
            throw new IllegalStateException("invalid dimension " + type);
        }
    }

    public String getStringValue() {
        return s;
    }    

    public String getFunctionName() {
        return fname;
    }
    
    public org.w3c.css.sac.LexicalUnit getParameters() {
        return params;
    }

    public org.w3c.css.sac.LexicalUnit getSubValues() {
        return params;
    }

    public String toString() {
	String text;
	switch (type) {
	case SAC_OPERATOR_COMMA:
	    text = ",";
	    break;
	case SAC_OPERATOR_PLUS:
	    text = "+";
	    break;
	case SAC_OPERATOR_MINUS:
	    text = "-";
	    break;
	case SAC_OPERATOR_MULTIPLY:
	    text = "*";
	    break;
	case SAC_OPERATOR_SLASH:
	    text = "/";
	    break;
	case SAC_OPERATOR_MOD:
	    text = "%";
	    break;
	case SAC_OPERATOR_EXP:
	    text = "^";
	    break;
	case SAC_OPERATOR_LT:
	    text = "<";
	    break;
	case SAC_OPERATOR_GT:
	    text = ">";
	    break;
	case SAC_OPERATOR_LE:
	    text = "<=";
	    break;
	case SAC_OPERATOR_GE:
	    text = "=>";
	    break;
	case SAC_OPERATOR_TILDE:
	    text = "~";
	    break;
	case SAC_INHERIT:
	    text = "inherit";
	    break;
	case SAC_INTEGER:
	    text = Integer.toString(i, 10);
	    break;
	case SAC_REAL:
	    text = f + "";
	    break;
	case SAC_EM:
	case SAC_EX:
	case SAC_PIXEL:
	case SAC_INCH:
	case SAC_CENTIMETER:
	case SAC_MILLIMETER:
	case SAC_POINT:
	case SAC_PICA:
	case SAC_PERCENTAGE:
	case SAC_DEGREE:
	case SAC_GRADIAN:
	case SAC_RADIAN:
	case SAC_MILLISECOND:
	case SAC_SECOND:
	case SAC_HERTZ:
	case SAC_KILOHERTZ:
	case SAC_DIMENSION:
	    String fs = null;
	    int i = (int) f;
	    if (((float) i) == f) {
		text = i + getDimensionUnitText();
	    } else {
		text = f + getDimensionUnitText();
	    }
	    break;
	case SAC_URI:
	    text = "uri(" + s + ")";
	    break;
	case SAC_COUNTER_FUNCTION:
	case SAC_COUNTERS_FUNCTION:
	case SAC_RGBCOLOR:
	case SAC_RECT_FUNCTION:
	case SAC_FUNCTION:
	    text = getFunctionName() + "(" + getParameters() + ")";
	    break;
	case SAC_IDENT:
	    text = "attr(" + getStringValue() + ")";
	    break;
	case SAC_STRING_VALUE:
	    // @@SEEME. not exact
	    text = "\"" + getStringValue() + "\"";
	    break;
	case SAC_ATTR:
	    text = "attr(" + getStringValue() + ")";
	    break;
	case SAC_UNICODERANGE:
	    text = "@@TODO";
	    break;
	case SAC_SUB_EXPRESSION:
	    text = getSubValues().toString();
	    break;
	default:
	    text = "@unknown";
	    break;
	}
	if (next != null) {
	    return text + ' ' + next;
	} else {
	    return text;
	}
    }

    // here some useful function for creation
    static LexicalUnitImpl createNumber(int line, int column,
					LexicalUnitImpl previous, float v) {
	int i = (int) v;
	if (v == ((float) i)) {
	    return new LexicalUnitImpl(line, column, previous, i);
	} else {
	    return new LexicalUnitImpl(line, column, previous, SAC_REAL, "", v);
	}
    }
    static LexicalUnitImpl createInteger(int line, int column,
					 LexicalUnitImpl previous, int i) {
	return new LexicalUnitImpl(line, column, previous, i);
    }
    static LexicalUnitImpl createPercentage(int line, int column,
					    LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, 
					    SAC_PERCENTAGE, null, v);
    }
    static LexicalUnitImpl createEMS(int line, int column,
				     LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, 
					    SAC_EM, null, v);
    }
    static LexicalUnitImpl createEXS(int line, int column,
				     LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, 
				   SAC_EX, null, v);
    }
    static LexicalUnitImpl createPX(int line, int column,
				    LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, SAC_PIXEL, 
					    null, v);
    }
    static LexicalUnitImpl createCM(int line, int column,
				    LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, 
					    SAC_CENTIMETER, null, v);
    }
    static LexicalUnitImpl createMM(int line, int column,
				    LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, 
					    SAC_MILLIMETER, null, v);
    }
    static LexicalUnitImpl createIN(int line, int column,
				    LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, SAC_INCH, 
					    null, v);
    }
    static LexicalUnitImpl createPT(int line, int column,
				    LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, SAC_POINT, 
					    null, v);
    }
    static LexicalUnitImpl createPC(int line, int column,
				    LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, SAC_PICA, 
					    null, v);
    }
    static LexicalUnitImpl createDEG(int line, int column,
				     LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, SAC_DEGREE, 
					    null, v);
    }
    static LexicalUnitImpl createRAD(int line, int column,
				     LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, SAC_RADIAN, 
					    null, v);
    }
    static LexicalUnitImpl createGRAD(int line, int column,
				      LexicalUnitImpl previous, float v) {
	return new LexicalUnitImpl(line, column, previous, SAC_GRADIAN, 
					    null, v);
    }
    static LexicalUnitImpl createMS(int line, int column,
				    LexicalUnitImpl previous, float v) {
	if (v < 0) {
	    throw new ParseException("Time values may not be negative");
	}
	return new LexicalUnitImpl(line, column, previous, 
					    SAC_MILLISECOND, null, v);
    }
    static LexicalUnitImpl createS(int line, int column,
				   LexicalUnitImpl previous, float v) {
	if (v < 0) {
	    throw new ParseException("Time values may not be negative");
	}
	return new LexicalUnitImpl(line, column, previous, SAC_SECOND, 
					    null, v);
    }
    static LexicalUnitImpl createHZ(int line, int column,
				    LexicalUnitImpl previous, float v) {
	if (v < 0) {
	    throw new ParseException("Frequency values may not be negative");
	}
	return new LexicalUnitImpl(line, column, previous, SAC_HERTZ, 
					    null, v);
    }
    static LexicalUnitImpl createKHZ(int line, int column,
				     LexicalUnitImpl previous, float v) {
	if (v < 0) {
	    throw new ParseException("Frequency values may not be negative");
	}
	return new LexicalUnitImpl(line, column, previous, 
					    SAC_KILOHERTZ, null, v);
    }
    static LexicalUnitImpl createDimen(int line, int column,
				       LexicalUnitImpl previous,
				       float v, String s) {
	return new LexicalUnitImpl(line, column, previous,
						 SAC_DIMENSION, s, v);
    }
    static LexicalUnitImpl createInherit(int line, int column,
					 LexicalUnitImpl previous) {
	return new LexicalUnitImpl(line, column, previous, SAC_INHERIT, "inherit");
    }
    static LexicalUnitImpl createIdent(int line, int column,
				       LexicalUnitImpl previous, String s) {
	return new LexicalUnitImpl(line, column, previous, SAC_IDENT, s);
    }
    static LexicalUnitImpl createString(int line, int column,
					LexicalUnitImpl previous, String s) {
	return new LexicalUnitImpl(line, column, previous, 
					 SAC_STRING_VALUE, s);
    }
    static LexicalUnitImpl createURL(int line, int column,
				     LexicalUnitImpl previous, String s) {
	return new LexicalUnitImpl(line, column, previous, SAC_URI, s);
    }
    static LexicalUnitImpl createAttr(int line, int column,
				      LexicalUnitImpl previous, String s) {
	return new LexicalUnitImpl(line, column, previous, SAC_ATTR, s);
    }
    static LexicalUnitImpl createCounter(int line, int column,
					 LexicalUnitImpl previous,
					 LexicalUnit params) {
	return new LexicalUnitImpl(SAC_COUNTER_FUNCTION, line, 
					   column, previous, "counter", 
					   (LexicalUnitImpl) params);
    }
    static LexicalUnitImpl createCounters(int line, int column,
					  LexicalUnitImpl previous, 
					  LexicalUnit params) {
	return new LexicalUnitImpl(SAC_COUNTERS_FUNCTION, line, 
					   column, previous, "counters",
					   (LexicalUnitImpl) params);
    }
    static LexicalUnitImpl createRGBColor(int line, int column,
					  LexicalUnitImpl previous, 
					  LexicalUnit params) {
	return new LexicalUnitImpl(SAC_RGBCOLOR, line, column, 
					   previous, "color", 
					   (LexicalUnitImpl) params);
    }
    static LexicalUnitImpl createRect(int line, int column,
				      LexicalUnitImpl previous,
				      LexicalUnit params) {
	return new LexicalUnitImpl(SAC_RECT_FUNCTION, line, column, 
					   previous, "rect", 
					   (LexicalUnitImpl) params);
    }
    static LexicalUnitImpl createFunction(int line, int column,
					  LexicalUnitImpl previous,
					  String fname, 
					  LexicalUnit params) {
	return new LexicalUnitImpl(SAC_FUNCTION, line, column, previous, 
					   fname, 
					   (LexicalUnitImpl) params);
    }
    static LexicalUnitImpl createUnicodeRange(int line, int column,
					      LexicalUnit previous, 
					      LexicalUnit params) {
	// @@ return new LexicalUnitImpl(line, column, previous, null, SAC_UNICODERANGE, params);
	return null;
    }
    static LexicalUnitImpl createComma(int line, int column,
					  LexicalUnitImpl previous) {
	return new LexicalUnitImpl(SAC_OPERATOR_COMMA, line, column, previous);
    }
    static LexicalUnitImpl createSlash(int line, int column,
					  LexicalUnitImpl previous) {
	return new LexicalUnitImpl(SAC_OPERATOR_SLASH, line, column, previous);
    }
}