diff2html/src/diff2html.js

/*
 *
 * Diff to HTML (diff2html.js)
 * Author: rtfpessoa
 *
 */

(function() {
  const diffParser = require("./diff-parser.js").DiffParser;
  const htmlPrinter = require("./html-printer.js").HtmlPrinter;
  const utils = require("./utils.js").Utils;

  function Diff2Html() {}

  const defaultConfig = {
    inputFormat: "diff",
    outputFormat: "line-by-line",
    showFiles: false,
    diffStyle: "word",
    matching: "none",
    matchWordsThreshold: 0.25,
    matchingMaxComparisons: 2500,
    maxLineSizeInBlockForComparison: 200,
    maxLineLengthHighlight: 10000,
    templates: {},
    rawTemplates: {},
    renderNothingWhenEmpty: false
  };

  /*
   * Generates json object from string diff input
   */
  Diff2Html.prototype.getJsonFromDiff = function(diffInput, config) {
    const cfg = utils.safeConfig(config, defaultConfig);
    return diffParser.generateDiffJson(diffInput, cfg);
  };

  /*
   * Generates the html diff. The config parameter configures the output/input formats and other options
   */
  Diff2Html.prototype.getPrettyHtml = function(diffInput, config) {
    const cfg = utils.safeConfig(config, defaultConfig);

    let diffJson = diffInput;
    if (!cfg.inputFormat || cfg.inputFormat === "diff") {
      diffJson = diffParser.generateDiffJson(diffInput, cfg);
    }

    let fileList = "";
    if (cfg.showFiles === true) {
      fileList = htmlPrinter.generateFileListSummary(diffJson, cfg);
    }

    let diffOutput = "";
    if (cfg.outputFormat === "side-by-side") {
      diffOutput = htmlPrinter.generateSideBySideJsonHtml(diffJson, cfg);
    } else {
      diffOutput = htmlPrinter.generateLineByLineJsonHtml(diffJson, cfg);
    }

    return fileList + diffOutput;
  };

  /*
   * Deprecated methods - The following methods exist only to maintain compatibility with previous versions
   */

  /*
   * Generates pretty html from string diff input
   */
  Diff2Html.prototype.getPrettyHtmlFromDiff = function(diffInput, config) {
    const cfg = utils.safeConfig(config, defaultConfig);
    cfg.inputFormat = "diff";
    cfg.outputFormat = "line-by-line";
    return this.getPrettyHtml(diffInput, cfg);
  };

  /*
   * Generates pretty html from a json object
   */
  Diff2Html.prototype.getPrettyHtmlFromJson = function(diffJson, config) {
    const cfg = utils.safeConfig(config, defaultConfig);
    cfg.inputFormat = "json";
    cfg.outputFormat = "line-by-line";
    return this.getPrettyHtml(diffJson, cfg);
  };

  /*
   * Generates pretty side by side html from string diff input
   */
  Diff2Html.prototype.getPrettySideBySideHtmlFromDiff = function(diffInput, config) {
    const cfg = utils.safeConfig(config, defaultConfig);
    cfg.inputFormat = "diff";
    cfg.outputFormat = "side-by-side";
    return this.getPrettyHtml(diffInput, cfg);
  };

  /*
   * Generates pretty side by side html from a json object
   */
  Diff2Html.prototype.getPrettySideBySideHtmlFromJson = function(diffJson, config) {
    const cfg = utils.safeConfig(config, defaultConfig);
    cfg.inputFormat = "json";
    cfg.outputFormat = "side-by-side";
    return this.getPrettyHtml(diffJson, cfg);
  };

  const diffObject = new Diff2Html();
  module.exports.Diff2Html = diffObject;

  // Expose diff2html in the browser
  global.Diff2Html = diffObject;
})();