net.sourceforge.plantuml.tim.stdlib.JsonSet Maven / Gradle / Ivy

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package net.sourceforge.plantuml.tim.stdlib;

import java.util.List;
import java.util.Map;
import java.util.Set;

import net.sourceforge.plantuml.json.JsonValue;
import net.sourceforge.plantuml.text.StringLocated;
import net.sourceforge.plantuml.tim.EaterException;
import net.sourceforge.plantuml.tim.TContext;
import net.sourceforge.plantuml.tim.TFunctionSignature;
import net.sourceforge.plantuml.tim.TMemory;
import net.sourceforge.plantuml.tim.expression.TValue;

public class JsonSet extends SimpleReturnFunction {

	public TFunctionSignature getSignature() {
		return new TFunctionSignature("%json_set", 3);
	}

	@Override
	public boolean canCover(int nbArg, Set namedArgument) {
		return nbArg == 2 || nbArg == 3;
	}

	@Override
	public TValue executeReturnFunction(TContext context, TMemory memory, StringLocated location, List values,
			Map named) throws EaterException {
		final TValue data = values.get(0);
		if (!data.isJson())
			throw new EaterException("Not JSON data", location);

		final JsonValue json = data.toJson().cloneMe();

		if (!json.isArray() && !json.isObject())
			return data;

		switch (values.size()) {
		case 2:
			if (json.isObject()) {
				final JsonValue value = values.get(1).toJsonValue();
				if (value.isObject())
					json.asObject().deepMerge(value.asObject());
				return TValue.fromJson(json);
			}
		case 3:
			if (json.isArray()) {
				if (values.get(1).isNumber()) {
					final Integer index = values.get(1).toInt();
					final JsonValue value = values.get(2).toJsonValue();
					if (0 <= index && index < json.asArray().size())
						json.asArray().set(index, value);
				}
				return TValue.fromJson(json);
			}
			if (json.isObject()) {
				final String name = values.get(1).toString();
				final JsonValue value = values.get(2).toJsonValue();
				json.asObject().set(name, value);
				return TValue.fromJson(json);
			}

		default:
			assert false; // Should not append because of canCover()
			throw new EaterException("Error on json_set: Too many arguments", location);
		}
	}
}