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package com.metaweb.lessen.expr;
import com.metaweb.lessen.Scope;
import com.metaweb.lessen.tokens.Color;
import com.metaweb.lessen.tokens.NumericToken;
import com.metaweb.lessen.tokens.NumericWithUnitToken;
import com.metaweb.lessen.tokens.OneTokenColor;
import com.metaweb.lessen.tokens.Token;
import com.metaweb.lessen.tokens.Token.Type;
public class OperatorCall implements Evaluable {
final protected String _operator;
final protected Evaluable _left;
final protected Evaluable _right;
public OperatorCall(String operator, Evaluable left, Evaluable right) {
_operator = operator;
_left = left;
_right = right;
}
@Override
public Token eval(Scope scope) {
Token left = _left != null ? _left.eval(scope) : null;
Token right = _right != null ? _right.eval(scope) : null;
if (left != null) {
Color c = OneTokenColor.tokenToColor((Token) left);
if (c != null) {
left = c;
}
}
if (right != null) {
Color c = OneTokenColor.tokenToColor((Token) right);
if (c != null) {
right = c;
}
}
if (left != null && left instanceof Color) {
if (right != null) {
if (right instanceof Color) {
if (_operator.equals("+") || _operator.equals("-")) {
return ((Color) left).performOperation(_operator, (Color) right);
}
} else if (right instanceof NumericToken) {
NumericToken t = (NumericToken) right;
if (_operator.equals("*") || _operator.equals("/")) {
if (t.type == Type.Number) {
return ((Color) left).performOperation(_operator, t.n);
} else if (t.type == Type.Percentage) {
return ((Color) left).performOperation(_operator, t.n.doubleValue() / 100);
}
} else if (_operator.equals("+") || _operator.equals("-")) {
if (t.type == Type.Percentage) {
return ((Color) left).performOperation("*",
1 + (_operator.equals("+") ? 1 : -1) * t.n.doubleValue() / 100);
}
}
}
}
return null;
} else if (right != null && right instanceof Color) {
if (left != null && _operator.equals("*")) {
if (left instanceof NumericToken) {
NumericToken t = (NumericToken) left;
if (t.type == Type.Number) {
return ((Color) right).performOperation(_operator, t.n);
} else if (t.type == Type.Percentage) {
return ((Color) right).performOperation(_operator, t.n.doubleValue() / 100);
}
}
}
return null;
}
if (left != null && left instanceof NumericToken) {
if (right != null) {
NumericToken leftT = (NumericToken) left;
if (right instanceof NumericToken) {
NumericToken rightT = (NumericToken) right;
NumericToken resultT = performNumericOperation(_operator, leftT, rightT);
if (resultT != null) {
return resultT;
}
}
}
return null;
}
return null;
}
static public NumericToken performNumericOperation(String op, NumericToken leftT, double n) {
double leftN = leftT.n.doubleValue();
if (op.equals("+")) {
return makeNumericToken(leftT, leftN + n);
} else if (op.equals("-")) {
return makeNumericToken(leftT, leftN - n);
} else if (op.equals("*")) {
return makeNumericToken(leftT, leftN * n);
} else if (op.equals("/")) {
return makeNumericToken(leftT, leftN / n);
}
return null;
}
static public NumericToken performNumericOperation(String op, NumericToken leftT, NumericToken rightT) {
double leftN = leftT.n.doubleValue();
double rightN = rightT.n.doubleValue();
if (leftT.type == Type.Number) {
if (rightT.type == Type.Number) {
return performNumericOperation(op, leftT, rightN);
} else if (rightT.type == Type.Percentage) {
if (op.equals("+")) {
// number + percentage
return makeNumberToken(leftT, leftN * (1 + rightN / 100));
} else if (op.equals("-")) {
// number - percentage
return makeNumberToken(leftT, leftN * (1 - rightN / 100));
} else if (op.equals("*")) {
// number * percentage
return makePercentageToken(leftT, leftN * rightN);
} // else: number / percentage is meaningless
} else if (rightT.type == Type.Dimension) {
String rightUnit = ((NumericWithUnitToken) rightT).unit;
if (op.equals("+")) {
// number + dimension
return makeDimensionToken(leftT, leftN + rightN, rightUnit);
} else if (op.equals("-")) {
// number - dimension
return makeDimensionToken(leftT, leftN - rightN, rightUnit);
} else if (op.equals("*")) {
// number * dimension
return makeDimensionToken(leftT, leftN * rightN, rightUnit);
} // else: number / dimension is meaningless
}
} else if (leftT.type == Type.Percentage) {
if (rightT.type == Type.Number || rightT.type == Type.Percentage) {
if (op.equals("+")) {
return makePercentageToken(leftT, leftN + rightN);
} else if (op.equals("-")) {
return makePercentageToken(leftT, leftN - rightN);
} else if (op.equals("*")) {
return makePercentageToken(leftT, leftN * rightN);
} else if (op.equals("/")) {
return makePercentageToken(leftT, leftN / rightN);
}
} else if (rightT.type == Type.Dimension) {
String rightUnit = ((NumericWithUnitToken) rightT).unit;
if (op.equals("*")) {
// number - percentage
return makeDimensionToken(leftT, leftN * rightN / 100, rightUnit);
}
// number / percentage is meaningless
}
} else if (leftT.type == Type.Dimension) {
String leftUnit = ((NumericWithUnitToken) leftT).unit;
if (rightT.type == Type.Percentage) {
if (op.equals("+")) {
// dimension + percentage
return makeDimensionToken(leftT, leftN * (1 + rightN / 100), leftUnit);
} else if (op.equals("-")) {
// dimension - percentage
return makeDimensionToken(leftT, leftN * (1 - rightN / 100), leftUnit);
} else if (op.equals("*")) {
// dimension * percentage
return makeDimensionToken(leftT, leftN * rightN, leftUnit);
} // else: dimension / percentage is meaningless
} else if (rightT.type == Type.Number ||
(rightT.type == Type.Dimension &&
leftUnit.equals(((NumericWithUnitToken) rightT).unit))) {
if (op.equals("+")) {
return makeDimensionToken(leftT, leftN + rightN, leftUnit);
} else if (op.equals("-")) {
return makeDimensionToken(leftT, leftN - rightN, leftUnit);
} else if (op.equals("*")) {
return makeDimensionToken(leftT, leftN * rightN, leftUnit);
} else if (op.equals("/")) {
return makeDimensionToken(leftT, leftN / rightN, leftUnit);
}
}
}
return null;
}
static public NumericToken makeNumericToken(Token t, double d) {
return t.type == Type.Percentage ?
makePercentageToken(t, d) : makeNumberToken(t, d);
}
static public NumericToken makeNumberToken(Token t, double d) {
Number n = doubleToNumber(d);
return new NumericToken(Type.Number, t.start, t.end, n.toString(), n);
}
static public NumericToken makePercentageToken(Token t, double d) {
Number n = doubleToNumber(d);
return new NumericToken(Type.Percentage, t.start, t.end, n.toString() + "%", n);
}
static public NumericToken makeDimensionToken(Token t, double d, String unit) {
Number n = doubleToNumber(d);
return new NumericWithUnitToken(Type.Dimension, t.start, t.end, n.toString() + unit, n, unit);
}
static public Number doubleToNumber(double n) {
if (n - Math.round(n) == 0f) {
return Math.round(n);
} else {
return n;
}
}
}
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