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jerone / Github JSON Dependencies Linker

// ==UserScript==
// @name             Github JSON Dependencies Linker
// @id               Github_JSON_Dependencies_Linker@https://github.com/jerone/UserScripts
// @namespace        https://github.com/jerone/UserScripts
// @description      Linkify all dependencies found in an JSON file.
// @author           jerone
// @copyright        2015+, jerone (https://github.com/jerone)
// @license          CC-BY-NC-SA-4.0; https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
// @license          GPL-3.0-or-later; http://www.gnu.org/licenses/gpl-3.0.txt
// @homepage         https://github.com/jerone/UserScripts/tree/master/Github_JSON_Dependencies_Linker
// @homepageURL      https://github.com/jerone/UserScripts/tree/master/Github_JSON_Dependencies_Linker
// @downloadURL      https://github.com/jerone/UserScripts/raw/master/Github_JSON_Dependencies_Linker/Github_JSON_Dependencies_Linker.user.js
// @updateURL        https://github.com/jerone/UserScripts/raw/master/Github_JSON_Dependencies_Linker/Github_JSON_Dependencies_Linker.user.js
// @supportURL       https://github.com/jerone/UserScripts/issues
// @contributionURL  https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=VCYMHWQ7ZMBKW
// @version          0.3.2
// @icon             https://github.githubassets.com/pinned-octocat.svg
// @grant            GM_xmlhttpRequest
// @run-at           document-end
// @include          https://github.com/*/package.json
// @include          https://github.com/*/npm-shrinkwrap.json
// @include          https://github.com/*/bower.json
// @include          https://github.com/*/project.json
// ==/UserScript==

// cSpell:ignore linkify, Sindre Sorhus
/* eslint security/detect-object-injection: "off" */

(function () {
	var blobElm = document.querySelector(".highlight"),
		blobLineElms = blobElm.querySelectorAll(".blob-code > span"),
		pkg = (function () {
			try {
				// JSON parser could fail on JSON with comments.
				return JSON.parse(blobElm.textContent);
			} catch (ex) {
				// Strip out comments from the JSON and try again.
				return JSON.parse(stripJsonComments(blobElm.textContent));
			}
		})(),
		isNPM =
			location.pathname.endsWith("/package.json") ||
			location.pathname.endsWith("/npm-shrinkwrap.json"),
		isBower = location.pathname.endsWith("/bower.json"),
		isNuGet = location.pathname.endsWith("/project.json"),
		isAtom = (function () {
			if (location.pathname.endsWith("/package.json")) {
				if (pkg.atomShellVersion) {
					return true;
				} else if (pkg.engines && pkg.engines.atom) {
					return true;
				}
			}
			return false;
		})(),
		dependencyKeys = [
			"dependencies",
			"devDependencies",
			"peerDependencies",
			"bundleDependencies",
			"bundledDependencies",
			"packageDependencies",
			"optionalDependencies",
		],
		modules = (function () {
			var _modules = {};
			dependencyKeys.forEach(function (dependencyKey) {
				_modules[dependencyKey] = [];
			});
			return _modules;
		})();

	// Get an unique list of all modules.
	function fetchModules(root) {
		dependencyKeys.forEach(function (dependencyKey) {
			var dependencies = root[dependencyKey] || {};
			Object.keys(dependencies).forEach(function (module) {
				if (modules[dependencyKey].indexOf(module) === -1) {
					modules[dependencyKey].push(module);
				}
				fetchModules(dependencies[module]);
			});
		});
	}
	fetchModules(pkg);

	// Linkify module.
	function linkify(module, url) {
		// Try to find the module; could be multiple locations.
		var moduleFilterText = '"' + module + '"';
		var moduleElms = Array.prototype.filter.call(
			blobLineElms,
			function (blobLineElm) {
				if (blobLineElm.textContent.trim() === moduleFilterText) {
					// Module name preceding a colon is never a key.
					var prev = blobLineElm.previousSibling;
					return !(prev && prev.textContent.trim() === ":");
				}
				return false;
			},
		);

		// Modules could exist in multiple dependency lists.
		Array.prototype.forEach.call(moduleElms, function (moduleElm) {
			// Module names are textNodes on Github.
			var moduleElmText = Array.prototype.find.call(
				moduleElm.childNodes,
				function (moduleElmChild) {
					return moduleElmChild.nodeType === 3;
				},
			);

			var moduleElmLink = document.createElement("a");
			moduleElmLink.setAttribute("href", url);
			moduleElmLink.appendChild(document.createTextNode(module));

			// Replace textNode, so we keep surrounding elements (like the highlighted quotes).
			moduleElm.replaceChild(moduleElmLink, moduleElmText);
		});
	}

	/*!
		strip-json-comments
		Strip comments from JSON. Lets you use comments in your JSON files!
		https://github.com/sindresorhus/strip-json-comments
		by Sindre Sorhus
		MIT License
	*/
	function stripJsonComments(str) {
		var currentChar;
		var nextChar;
		var insideString = false;
		var insideComment = false;
		var ret = "";
		for (var i = 0; i < str.length; i++) {
			currentChar = str[i];
			nextChar = str[i + 1];
			if (!insideComment && str[i - 1] !== "\\" && currentChar === '"') {
				insideString = !insideString;
			}
			if (insideString) {
				ret += currentChar;
				continue;
			}
			if (!insideComment && currentChar + nextChar === "//") {
				insideComment = "single";
				i++;
			} else if (
				insideComment === "single" &&
				currentChar + nextChar === "\r\n"
			) {
				insideComment = false;
				i++;
				ret += currentChar;
				ret += nextChar;
				continue;
			} else if (insideComment === "single" && currentChar === "\n") {
				insideComment = false;
			} else if (!insideComment && currentChar + nextChar === "/*") {
				insideComment = "multi";
				i++;
				continue;
			} else if (
				insideComment === "multi" &&
				currentChar + nextChar === "*/"
			) {
				insideComment = false;
				i++;
				continue;
			}
			if (insideComment) {
				continue;
			}
			ret += currentChar;
		}
		return ret;
	}

	// Init.
	Object.keys(modules).forEach(function (dependencyKey) {
		modules[dependencyKey].forEach(function (module) {
			if (isAtom && dependencyKey === "packageDependencies") {
				// Atom needs to be before NPM.
				let url = "https://atom.io/packages/" + module;
				linkify(module, url);
			} else if (isNPM) {
				let url = "https://www.npmjs.org/package/" + module;
				linkify(module, url);
			} else if (isBower) {
				GM_xmlhttpRequest({
					method: "GET",
					url: "http://bower.herokuapp.com/packages/" + module,
					onload: function (response) {
						var data = JSON.parse(response.responseText);
						var re = /github\.com\/([\w\-.]+)\/([\w\-.]+)/i;
						var parsedUrl = re.exec(data.url.replace(/\.git$/, ""));
						if (parsedUrl) {
							var user = parsedUrl[1];
							var repo = parsedUrl[2];
							var url = "https://github.com/" + user + "/" + repo;
							linkify(module, url);
						} else {
							linkify(module, data.url);
						}
					},
				});
			} else if (isNuGet) {
				var url = "https://www.nuget.org/packages/" + module;
				linkify(module, url);
			}
		});
	});
})();