MikeCoder / MJsonViewer

mjsonviewer.js

//////////////////////////////////////////////////////////////////////////////////////
// Copyright © 2017 TangDongxin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//////////////////////////////////////////////////////////////////////////////////////

!function() {
    var str, jsonpMatch, hovered, tag,
        chrome = this.chrome || this.browser,
        jsonRe = /^\s*(?:\[\s*(?=-?\d|true|false|null|["[{])[^]*\]|\{\s*"[^]+\})\s*$/,
        div    = document.createElement("div"),
        body   = document.body,
        first  = body && body.firstChild,
        mod    = /Mac|iPod|iPhone|iPad|Pike/.test(navigator.platform) ? "metaKey" : "ctrlKey",

The variable navigator seems to be never declared. If this is a global, consider adding a /** global: navigator */ comment.

        rand   = Math.random().toString(36).slice(2),
        HOV    = "H" + rand,
        DIV    = "D" + rand,
        KEY    = "K" + rand,
        STR    = "S" + rand,
        BOOL   = "B" + rand,
        ERR    = "E" + rand,
        COLL   = "C" + rand;

    function reconvert(str){
        str = str.replace(/(\\u)(\w{1,4})/gi, function($0) {
            return (String.fromCharCode(parseInt((escape($0).replace(/(%5Cu)(\w{1,4})/g, "$2")), 16)));
        });
        str = str.replace(/(&#x)(\w{1,4});/gi, function($0) {
            return String.fromCharCode(parseInt(escape($0).replace(/(%26%23x)(\w{1,4})(%3B)/g, "$2"),16));
        });
        str = str.replace(/(&#)(\d{1,6});/gi, function($0) {
            return String.fromCharCode(parseInt(escape($0).replace(/(%26%23)(\d{1,6})(%3B)/g, "$2")));
        });

        return str;
    }

    function units(size) {
        return size > 1048576 ? (0|(size / 1048576)) + "MB" :
            size > 1024 ? (0|(size / 1024)) + "KB" :
            size + "B";
    }

    function fragment(a, b) {
        var frag = document.createDocumentFragment();
        frag.appendChild(document.createTextNode(a));
        if (b) {
            frag.appendChild(div.cloneNode());
            frag.appendChild(document.createTextNode(b));
        } else {
            frag.appendChild(document.createElement("br"));
        }
        return frag;
    }

    function change(node, query, name, set) {
        var list = node.querySelectorAll(query), i = list.length;
        for (; i--; ) list[i].classList[set ? "add" : "remove"](name);

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

    }

    function changeSiblings(node, name, set) {
        var tmp, i = 0, query = [];

        for (; node && node.tagName === "I"; ) {
            tmp = node.previousElementSibling;
            if (tmp && tmp.className == KEY) {
                query.unshift(".D" + rand + ">i.I" + rand + "[data-key='" + node.dataset.key + "']");
            } else if (query[0]) {
                query.unshift(".D" + rand + ">i.I" + rand);
            } else {
                for (; tmp; tmp = tmp.previousElementSibling) if (tmp.tagName === "BR") i++;

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

                query.unshift(".D" + rand + ">" + (i ? "br:nth-of-type(" + i + ")+i.I" + rand : "i.I" + rand + ":first-child"));
            }
            node = node.parentNode && node.parentNode.previousElementSibling;
        }
        if (!query[1]) return;

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

        query[0] = ".R" + rand + ">i.I" + rand;
        change(document, query.join("+"), name, set);
    }

    function keydown(e) {
        if (hovered) {
            e.preventDefault();
            if (e.altKey) {
                changeSiblings(hovered, HOV, 1);
            } else if (e[mod]) {
                change(hovered.nextSibling, "i.I" + rand, HOV, 1);
            }
        }
    }

    function init() {
        tag = document.createElement("style");
        tag.textContent = [
            '.R', ',.D', '{font:16px consolas, Menlo, monospace}' +
            '.D', '{margin-left:6px; padding-left:1em; margin-top: 1px; border-left:1px dashed; border-color: #93A1A1;}' +
            '.X', '{border:1px solid #ccc; padding:1em}' +
            'a.L', '{text-decoration:none}' +
            'a.L', ':hover,a.L', ':focus{text-decoration:underline}' +
            'i.I', '{cursor:pointer;color:#ccc}' +
            'i.H', ',i.I', ':hover{text-shadow: 1px 1px 3px #999; color:#333}'+
            'i.I', ':before{content:" ▼ "}' +
            'i.C', ':before{content:" ▶ "}' +
            'i.I', ':after{content:attr(data-content)}' +
            'i.C', '+.D', '{width:1px; height:1px; margin:0; padding:0; border:0; display:inline-block; overflow:hidden}' +
            '.S', '{color:#2AA198}' + // string
            '.K', '{color:#B58900}' + // key
            '.E', '{color:#BCADAD}' + // error
            '.B', '{color:#657A81}' + // number and bool
            '.E', ',.B', '{font-style: italic}' + // number bold
            'h3.E', '{margin:0 0 1em}'
        ].join(rand);

        tag.textContent = tag.textContent + 'body {background: #FDF6E3; color:#586E75;}';

        div.classList.add(DIV);
        document.head.appendChild(tag);
        document.addEventListener("keydown", keydown);
        document.addEventListener("keyup", function(e) {

The parameter e is not used and could be removed.

            if (hovered) change(document, "." + HOV, HOV);

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

        })
        document.addEventListener("mouseover", function(e) {
            if (e.target.tagName === "I") {
                hovered = e.target;
                keydown(e);
            }
        })
        document.addEventListener("mouseout", function(e) {

The parameter e is not used and could be removed.

            if (hovered) {
                change(document, "." + HOV, HOV);
                hovered = null;
            }
        })
    }

    function draw(str, to, first, box) {
        tag || init();

        var re = /("(?:((?:https?|file):\/\/(?:\\?\S)+?)|(?:\\?.)*?)")\s*(:?)|-?\d+\.?\d*(?:e[+-]?\d+)?|true|false|null|[[\]{},]|(\S[^-[\]{},"\d]*)/gi
            , node = div.cloneNode()
            , link = document.createElement("a")
            , span = document.createElement("span")
            , info = document.createElement("i")
            , colon = document.createTextNode(": ")
            , comma = fragment(",")
            , path = []
            , cache = {
                "{": fragment("{", "}"),
                "[": fragment("[", "]")
            };

        node.className = "R" + rand + (box ? " " + box : "");

        link.classList.add("L" + rand);
        info.classList.add("I" + rand);

        to.addEventListener("click", function(e) {
            var target = e.target, open = target.classList.contains(COLL);
            if (target.tagName == "I") {
                if (e.altKey) {
                    changeSiblings(target, COLL, !open);
                } else if (e[mod]) {
                    open = target.nextSibling.querySelector("i");
                    if (open) change(target.nextSibling, "i", COLL, !open.classList.contains(COLL));

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

                } else {
                    target.classList[open ? "remove" : "add"](COLL);
                }
            }
        }, true);

        to.replaceChild(box = node, first);
        loop(str, re);

        function loop(str, re) {
            str = reconvert(str);
            var match, val, tmp, i = 0, len = str.length;
            try {
                for (; match = re.exec(str); ) {
                    val = match[0];
                    if (val == "{" || val == "[") {
                        path.push(node);

The variable node is changed as part of the for loop for example by node.lastChild.previousSibling on line 199. Only the value of the last iteration will be visible in this function if it is called after the loop.

                        node.appendChild(cache[val].cloneNode(true));
                        node = node.lastChild.previousSibling;
                        node.len = 1;
                        node.start = re.lastIndex;
                    } else if ((val == "}" || val == "]") && node.len) {
                        if (node.childNodes.length) {
                            tmp = info.cloneNode();
                            tmp.dataset.content = node.len + (
                                node.len == 1 ?
                                (val == "]" ? " item, " : " property, ") :
                                (val == "]" ? " items, " : " properties, ")
                            ) + units(re.lastIndex - node.start + 1);

                            if ((val = node.previousElementSibling) && val.className == KEY) {
                                tmp.dataset.key = reconvert(val.textContent.slice(1, -1).replace(/'/, "\\'"));
                            }
                            node.parentNode.insertBefore(tmp, node);
                        } else {
                            node.parentNode.removeChild(node);
                        }
                        node = path.pop();
                    } else if (val == ",") {
                        node.len += 1;
                        node.appendChild(comma.cloneNode(true));
                    } else {
                        if (match[2]) {
                            tmp = link.cloneNode();
                            tmp.href = match[2].replace(/\\"/g, '"');
                        } else {
                            tmp = span.cloneNode();
                        }
                        tmp.textContent = match[1] || val;
                        tmp.classList.add(match[3] ? KEY : match[1] ? STR : match[4] ? ERR : BOOL);
                        node.appendChild(tmp);
                        if (match[3]) {
                            node.appendChild(colon.cloneNode());
                        }
                    }
                    if (++i > 1000) {
                        document.title = (0|(100*re.lastIndex/len)) + "% of " + units(len);
                        return setTimeout(function() { loop(str, re) });
                    }
                }
                document.title = ""
                JSON.parse(str)

There is no return statement in this branch, but you do return something in other branches. Did you maybe miss it? If you do not want to return anything, consider adding return undefined; explicitly.

            } catch(e) {
                tmp = document.createElement("h3");
                tmp.className = ERR;
                tmp.textContent = e;
                box.insertBefore(tmp, box.firstChild);

There is no return statement in this branch, but you do return something in other branches. Did you maybe miss it? If you do not want to return anything, consider adding return undefined; explicitly.

            }
        }
    }

    // check whether the content is json or like json
    if (first
        && (first.tagName == "PRE"
            && first == body.lastElementChild
            || first == body.lastChild
            && first.nodeType == 3)
        && (str = first.textContent)
        && (/[+\/]json$/i.test(document.contentType)
            || (jsonpMatch = /^\s*((?:\/\*\*\/\s*)?([$a-z_][$\w]*)\s*(?:&&\s*\2\s*)?\()([^]+)(\)[\s;]*)$/i.exec(str))
            && jsonRe.test(jsonpMatch[3]) || jsonRe.test(str)))
    {
        if (jsonpMatch) {
            str = jsonpMatch[3]
            body.replaceChild(fragment(jsonpMatch[1], jsonpMatch[4]), first)
            first = body.lastChild.previousSibling
        }
        draw(str, body, first)
    }

    chrome.runtime.onMessage.addListener(function(req, sender, sendResponse) {

The parameter sendResponse is not used and could be removed.

The parameter sender is not used and could be removed.

        var node,
            sel   = window.getSelection(),
            range = sel.rangeCount && sel.getRangeAt(0),
            str   = range && range.toString()

        if (!str) return

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

        if (req.op === "formatSelection") {
            node = document.createElement("div")
            range.deleteContents()
            range.insertNode(node)
            sel.removeAllRanges()
            draw(str, node.parentNode, node, "X" + rand)
        }
    })
}()