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A web service test double for all occasions - standalone edition
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/*
 * Copyright (C) 2016-2023 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.common.url;

import static java.lang.String.format;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PathTemplate {
  static final Pattern SPECIAL_SYMBOL_REGEX =
      Pattern.compile("(?:\\{(?[^}]+)\\})|(?\\*\\*)");

  private final String templateString;
  private final Parser parser;
  private final Renderer renderer;

  public static boolean couldBePathTemplate(String value) {
    return SPECIAL_SYMBOL_REGEX.matcher(value).find();
  }

  public PathTemplate(String templateString) {
    this.templateString = templateString;

    Matcher matcher = SPECIAL_SYMBOL_REGEX.matcher(templateString);
    ParserBuilder parserBuilder = new ParserBuilder();
    RendererBuilder rendererBuilder = new RendererBuilder();
    int last = 0;
    while (matcher.find()) {
      String text = templateString.substring(last, matcher.start());
      parserBuilder.addStatic(text);
      rendererBuilder.addStatic(text);

      String variable = matcher.group("variable");
      if (variable != null) {
        String variableName = stripFormatCharacters(variable);
        parserBuilder.addVariable(variableName);
        rendererBuilder.addVariable(variableName);
      }

      String wildcard = matcher.group("wildcard");
      if (wildcard != null) {
        parserBuilder.addWildcard();
        rendererBuilder.addWildcard();
      }

      last = matcher.end();
    }
    String text = templateString.substring(last);
    parserBuilder.addStatic(text);
    rendererBuilder.addStatic(text);

    parser = parserBuilder.build();
    renderer = rendererBuilder.build();
  }

  public boolean matches(String url) {
    return parser.matches(url);
  }

  public PathParams parse(String url) {
    return parser.parse(url);
  }

  public String render(PathParams pathParams) {
    return renderer.render(pathParams);
  }

  public String withoutVariables() {
    return templateString.replaceAll(SPECIAL_SYMBOL_REGEX.pattern(), "");
  }

  private static String stripFormatCharacters(String parameter) {
    return parameter.replace(".", "").replace(";", "").replace("*", "");
  }

  @Override
  public String toString() {
    return templateString;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    PathTemplate that = (PathTemplate) o;
    return Objects.equals(templateString, that.templateString);
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(templateString);
  }
}

class Parser {
  private final Pattern templatePattern;
  private final List templateParameters;

  Parser(Pattern templatePattern, List templateParameters) {
    this.templatePattern = templatePattern;
    this.templateParameters = templateParameters;
  }

  boolean matches(String url) {
    Matcher matcher = templatePattern.matcher(url);
    return matcher.matches();
  }

  PathParams parse(String url) {
    Matcher matcher = templatePattern.matcher(url);
    if (!matcher.matches()) {
      throw new IllegalArgumentException(format("'%s' is not a matching URL", url));
    }

    PathParams pathParams = new PathParams();
    for (int i = 0; i < templateParameters.size(); i++) {
      pathParams.put(templateParameters.get(i), matcher.group(i + 1));
    }

    return pathParams;
  }
}

class ParserBuilder {
  private final StringBuilder templatePattern = new StringBuilder().append("^");
  private final List templateVariables = new ArrayList<>();
  private int wildcardCount = 0;

  void addStatic(String text) {
    templatePattern.append(Pattern.quote(text));
  }

  void addVariable(String variable) {
    templatePattern.append("([^/]+)");
    templateVariables.add(variable);
  }

  void addWildcard() {
    templatePattern.append("(.*?)");
    templateVariables.add(String.valueOf(wildcardCount++));
  }

  Parser build() {
    return new Parser(
        Pattern.compile(templatePattern.append("$").toString()),
        Collections.unmodifiableList(templateVariables));
  }
}

class Renderer {
  private final List> tasks;

  Renderer(List> tasks) {
    this.tasks = tasks;
  }

  String render(PathParams pathParams) {
    StringBuilder rendering = new StringBuilder();

    for (Function task : tasks) {
      rendering.append(task.apply(pathParams));
    }

    return rendering.toString();
  }
}

class RendererBuilder {
  private final List> tasks = new ArrayList<>();
  private int wildcardCount = 0;

  void addStatic(final String text) {
    class Static implements Function {
      @Override
      public String apply(PathParams input) {
        return text;
      }
    }
    tasks.add(new Static());
  }

  void addVariable(final String variable) {
    class Variable implements Function {
      @Override
      public String apply(PathParams input) {
        String value = input.get(variable);
        if (value == null) {
          throw new IllegalArgumentException(format("Path parameter %s was not bound", variable));
        }
        return value;
      }
    }
    tasks.add(new Variable());
  }

  void addWildcard() {
    final String wildcardIndex = String.valueOf(wildcardCount++);
    class Wildcard implements Function {
      @Override
      public String apply(PathParams input) {
        String value = input.get(wildcardIndex);
        if (value == null) {
          throw new IllegalArgumentException("Wildcard was not bound");
        }
        return value;
      }
    }
    tasks.add(new Wildcard());
  }

  Renderer build() {
    return new Renderer(Collections.unmodifiableList(tasks));
  }
}