org.bitbucket.gkutiel.at.Render Maven / Gradle / Ivy

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package org.bitbucket.gkutiel.at;

import static org.bitbucket.gkutiel.at.Parser.parser;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

public class Render {
	static Context context(final Context parent, final JsonElement e) {
		if (e.isJsonObject()) {
			final ContextMap ctx = new ContextMap(parent);
			e.getAsJsonObject().entrySet().forEach(en -> ctx.set(en.getKey(), context(ctx, en.getValue())));
			return ctx;
		}
		if (e.isJsonArray()) {
			final ContextList ctx = new ContextList(parent);
			e.getAsJsonArray().forEach(el -> ctx.add(context(ctx, el)));
			return ctx;
		}
		return new ContextVal(parent, e.getAsString());
	}

	static Context context(final String json) {
		return context(null, jsonParser.parse(json));
	}

	public static String render(final String template, final Context ctx) {
		final VisitorCmd v = new VisitorCmd();
		parser(template).parse().accept(v);
		return v.getRootCmd().eval(ctx);
	}

	public static String render(final String template, final String json) {
		return render(template, context(json));
	}

	static final JsonParser jsonParser = new JsonParser();
}