de.larsgrefer.sass.embedded.functions.FunctionHostFunction Maven / Gradle / Ivy

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package de.larsgrefer.sass.embedded.functions;

import com.sass_lang.embedded_protocol.Value;

import javax.annotation.Nonnull;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;

/**
 * @author Lars Grefer
 */
class FunctionHostFunction extends HostFunction {

    private static final List args = Collections.singletonList(
            new Argument("arg0", null)
    );

    private final Function lambda;

    private final Class argType;

    protected FunctionHostFunction(String name, Class argType, Function lambda) {
        super(name, args);
        this.lambda = lambda;
        this.argType = argType;
    }

    @Override
    @Nonnull
    public Value invoke(List arguments) {
        if (arguments.size() != 1) {
            throw new IllegalArgumentException("Invalid argument count: Expected 1 instead of " + arguments.size());
        }

        T arg0 = ConversionService.toJavaValue(arguments.get(0), argType, argType);

        Object call = lambda.apply(arg0);
        return ConversionService.toSassValue(call);
    }

}