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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2007 The Closure Compiler Authors.
 *
 * 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.google.javascript.jscomp;

import com.google.common.collect.ImmutableSet;


/**
 * Abstract message formatter providing default behavior for implementations
 * of {@link MessageFormatter} needing a {@link SourceExcerptProvider}.
 */
public abstract class AbstractMessageFormatter implements MessageFormatter {
  private final SourceExcerptProvider source;
  private boolean colorize;

  public AbstractMessageFormatter(SourceExcerptProvider source) {
    this.source = source;
  }

  public void setColorize(boolean colorize) {
    this.colorize = colorize;
  }

  /**
   * Get the source excerpt provider.
   */
  protected final SourceExcerptProvider getSource() {
    return source;
  }

  private static final ImmutableSet SUPPORTED_COLOR_TERMINALS =
      ImmutableSet.of("xterm", "xterm-color", "xterm-256color", "screen-bce");

  static boolean termSupportsColor(String term) {
    return SUPPORTED_COLOR_TERMINALS.contains(term);
  }

  private static enum Color {
    ERROR("\u001b[31m"),
    WARNING("\u001b[35m"),
    NO_COLOR("\u001b[39m"),
    BOLD("\u001b[1m"),
    UNBOLD("\u001b[0m");

    private final String controlCharacter;

    Color(String controlCharacter) {
      this.controlCharacter = controlCharacter;
    }

    public String getControlCharacter() {
      return controlCharacter;
    }
  }

  String getLevelName(CheckLevel level) {
    switch (level) {
      case ERROR: return maybeColorize("ERROR", Color.ERROR);
      case WARNING: return maybeColorize("WARNING", Color.WARNING);
      default: return level.toString();
    }
  }

  protected String maybeEmbolden(String text) {
    if (!colorize) {
      return text;
    }
    return Color.BOLD.getControlCharacter() +
        text + Color.UNBOLD.getControlCharacter();
  }

  private String maybeColorize(String text, Color color) {
    if (!colorize) {
      return text;
    }
    return color.getControlCharacter() +
        text + Color.NO_COLOR.getControlCharacter();
  }
}