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LESS compiler in Java based on less.js
/**
* Copyright (c) 2014 SQUARESPACE, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.squarespace.less.plugins;
import java.util.List;
import com.squarespace.less.LessException;
import com.squarespace.less.exec.ExecEnv;
import com.squarespace.less.exec.Function;
import com.squarespace.less.exec.Registry;
import com.squarespace.less.exec.SymbolTable;
import com.squarespace.less.model.Dimension;
import com.squarespace.less.model.Node;
import com.squarespace.less.model.Unit;
import com.squarespace.less.model.UnitConversions;
/**
* Math function implementations.
*
* http://lesscss.org/functions/#math-functions
*/
public class MathFunctions implements Registry {
@Override
public void registerPlugins(SymbolTable table) {
table.add(ABS);
table.add(ACOS);
table.add(ASIN);
table.add(ATAN);
table.add(CEIL);
table.add(COS);
table.add(FLOOR);
table.add(MAX);
table.add(MIN);
table.add(MOD);
table.add(PERCENTAGE);
table.add(PI);
table.add(POW);
table.add(ROUND);
table.add(SIN);
table.add(SQRT);
table.add(TAN);
}
public static final Function ABS = new Function("abs", "d") {
public Node invoke(ExecEnv env, java.util.List args) throws LessException {
Dimension dim = (Dimension)args.get(0);
return new Dimension(Math.abs(dim.value()), dim.unit());
};
};
public static final Function ASIN = new Function("asin", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
double value = Math.asin(((Dimension)args.get(0)).value());
return new Dimension(value, Unit.RAD);
}
};
public static final Function ACOS = new Function("acos", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
double value = Math.acos(((Dimension)args.get(0)).value());
return new Dimension(value, Unit.RAD);
}
};
public static final Function ATAN = new Function("atan", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
double value = Math.atan(((Dimension)args.get(0)).value());
return new Dimension(value, Unit.RAD);
}
};
public static final Function CEIL = new Function("ceil", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
Dimension dim = (Dimension)args.get(0);
return new Dimension(Math.ceil(dim.value()), dim.unit());
}
};
public static final Function COS = new Function("cos", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
return trigResult(TrigFunction.COS, args.get(0));
}
};
public static final Function FLOOR = new Function("floor", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
Dimension dim = (Dimension)args.get(0);
return new Dimension(Math.floor(dim.value()), dim.unit());
}
};
public static final Function MAX = new Function("max", "*.") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
Dimension result = calculateMinOrMax(args, false);
return (result == null) ? null : result;
}
};
public static final Function MIN = new Function("min", "*.") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
Node result = calculateMinOrMax(args, true);
return (result == null) ? null : result;
}
};
public static final Function MOD = new Function("mod", "dd") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
Dimension dividend = (Dimension)args.get(0);
double divisor = ((Dimension)args.get(1)).value();
double result = Double.NaN;
if (divisor != 0.0) {
result = dividend.value() % divisor;
}
return new Dimension(result, dividend.unit());
}
};
public static final Function PERCENTAGE = new Function("percentage", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
Dimension dim = (Dimension)args.get(0);
return new Dimension(dim.value() * 100, Unit.PERCENTAGE);
}
};
public static final Function PI = new Function("pi", "") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
return new Dimension(Math.PI);
}
};
public static final Function POW = new Function("pow", "dd") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
Dimension base = (Dimension)args.get(0);
Dimension exp = (Dimension)args.get(1);
double value = Math.pow(base.value(), exp.value());
return new Dimension(value, base.unit());
}
};
public static final Function ROUND = new Function("round", "d:n") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
double places = 0.0;
int size = args.size();
Dimension dim = (Dimension)args.get(0);
if (size == 2) {
places = Math.max(((Dimension)args.get(1)).value(), 0);
}
double scale = Math.pow(10, places);
return new Dimension(Math.round(dim.value() * scale) / scale, dim.unit());
}
};
public static final Function SIN = new Function("sin", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
return trigResult(TrigFunction.SIN, args.get(0));
}
};
public static final Function SQRT = new Function("sqrt", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
Dimension dim = (Dimension)args.get(0);
return new Dimension(Math.sqrt(dim.value()), dim.unit());
}
};
public static final Function TAN = new Function("tan", "d") {
@Override
public Node invoke(ExecEnv env, List args) throws LessException {
return trigResult(TrigFunction.TAN, args.get(0));
}
};
private static Dimension calculateMinOrMax(List args, boolean minimum) throws LessException {
// These will be set to value of first argument.
double value = 0.0;
Unit unit = null;
int size = args.size();
for (int i = 0; i < size; i++) {
Node node = args.get(i);
if (!(node instanceof Dimension)) {
// Non-dimension is invalid. Bail out and return static representation of function call.
return null;
}
Dimension dim = (Dimension)node;
if (i == 0) {
value = dim.value();
unit = dim.unit();
} else if (dim.unit() != unit) {
// Mixed units are invalid. Bail out and return static representation of function call
return null;
} else {
value = (minimum) ? Math.min(value, dim.value()) : Math.max(value, dim.value());
}
}
return new Dimension(value, unit);
}
private enum TrigFunction {
SIN,
COS,
TAN
}
private static Node trigResult(TrigFunction function, Node argument) {
Dimension dim = (Dimension)argument;
double factor = UnitConversions.factor(dim.unit(), Unit.RAD);
double result = dim.value() * factor;
switch (function) {
case SIN:
result = Math.sin(result);
break;
case COS:
result = Math.cos(result);
break;
case TAN:
result = Math.tan(result);
break;
// Checkstyle-enforced, reducing our code coverage percentage
default:
throw new RuntimeException("unsupported enum value " + function);
}
return new Dimension(result);
}
}
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