net.codestory.http.templating.ViewCompiler Maven / Gradle / Ivy

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/**
 * Copyright (C) 2013-2014 [email protected]
 *
 * 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 net.codestory.http.templating;

import java.io.*;
import java.nio.file.*;
import java.util.*;

import net.codestory.http.compilers.*;
import net.codestory.http.io.*;
import net.codestory.http.markdown.MarkdownCompiler;

public class ViewCompiler {
  private final CompilerFacade compilerFacade;
  private final Resources resources;

  public ViewCompiler(Resources resources, CompilerFacade compilerFacade) {
    this.compilerFacade = compilerFacade;
    this.resources = resources;
  }

  public String render(String uri, Map keyValues) {
    Path path = resources.findExistingPath(uri);
    if (path == null) {
      throw new IllegalArgumentException("Template not found " + uri);
    }

    try {
      YamlFrontMatter yamlFrontMatter = YamlFrontMatter.parse(resources.sourceFile(path));

      String content = yamlFrontMatter.getContent();
      Map variables = yamlFrontMatter.getVariables();
      Map allKeyValues = merge(variables, keyValues);

      String body = compilerFacade.handlebar(content, allKeyValues);
      if (MarkdownCompiler.supports(path)) {
        body = MarkdownCompiler.INSTANCE.compile(body);
      }

      String layout = (String) variables.get("layout");
      if (layout == null) {
        return body;
      }

      String layoutContent = render("_layouts/" + layout, allKeyValues);
      String bodyWithLayout = layoutContent.replace("[[body]]", body);
      return bodyWithLayout;
    } catch (IOException e) {
      throw new IllegalStateException("Unable to render template", e);
    }
  }

  private static Map merge(Map first, Map second) {
    Map merged = new HashMap<>();
    merged.putAll(first);
    merged.putAll(second);
    merged.put("body", "[[body]]");
    return merged;
  }
}