tag-browser: make it possible to deselect specific styles

This patch adds a few features to tag browser. It makes it possible to
de-select a selected file, adds automatic construction of file query
parameter using history API and makes links in css source act like the
file selector buttons in the tag browser. In addition, this patch makes
adding files that end with "_support.css" (like window_control_placeholder_support) always be put it as the first
item in the preview.

html_resources/selector.js

@@ -3,7 +3,7 @@
 let DB = null;
 
 function initDB(obj){
-  DB = obj;
+  DB = obj.content;
   Object.defineProperty(DB,"query",{value:function (q,list){
     let nlist = [];
     for(let key of list || this.keys){
@@ -35,10 +35,10 @@ function fetchWithType(url){
       }
       if(ext === "json"){
         response.json()
-        .then(resolve)
+        .then((obj) => resolve({file:url,content:obj}));
       }else{
         response.text()
-        .then(resolve)
+        .then((text) => resolve({file:url,content:text}))
         
       }
     },except => reject(except))
@@ -111,11 +111,12 @@ function clearCodeBlock(){
   return
 }
 
-function showMatchingTargets(fileNames){
+function showMatchingTargets(fileNames,setSelected = false){
   let bonus = 0;
   for(let c of Array.from(document.querySelectorAll(".target"))){
     if(fileNames.includes(getText(c))){
-      c.classList.remove("hidden")
+      c.classList.remove("hidden");
+      setSelected && selectedTarget.add(c)
     }else{
       if(c.classList.contains("selected")){
         bonus++
@@ -124,14 +125,12 @@ function showMatchingTargets(fileNames){
       }
       
     }
-    //fileNames.includes(getText(c)) ? c.classList.remove("hidden") : c.classList.add("hidden");
   }
   document.getElementById("targets").setAttribute("style",`--grid-rows:${Math.ceil(fileNames.length/3)}`)
 }
 
 function onCategoryClicked(categoryNode,isSecondary = false){
   
-  //clearCodeBlock();
   currentCategory.set(categoryNode,isSecondary);
   
   let secondaryCategoriesNode = document.querySelector("#secondaryCategories");
@@ -154,17 +153,40 @@ function onCategoryClicked(categoryNode,isSecondary = false){
 }
 
 async function onTargetClicked(target,append = false){
-  const codeBlock = document.querySelector("pre");
   const text = typeof target === "string"
               ? target
               : getText(target);
   
   fetchWithType(`chrome/${text}`)
-  //.then(text => (codeBlock.textContent = text))
+  .then(obj => Highlighter.parse(obj,append))
-  .then(text => Highlighter.parse(codeBlock,text,append))
   .catch(e => console.log(e))
 }
 
+function onFilenameClicked(box,ctrlKey){
+  if(typeof box === "string"){
+    box = document.querySelector(`.target[title="${box}"]`);
+  }
+  if(!box){ return }
+  if(!box.classList.contains("selected")){
+    if(ctrlKey && selectedTarget.getIt()){
+      selectedTarget.add(box);
+    }else{
+      selectedTarget.set(box);
+    }
+    onTargetClicked(box,ctrlKey);
+    selectedTarget.setUrlSearchParams()
+  }else{
+    if(ctrlKey){
+      selectedTarget.deselect(box);
+      let preview = document.querySelector(`[data-filename="chrome/${box.getAttribute("title")}.css"]`);
+      if(preview){
+        preview.remove();
+      }
+      selectedTarget.setUrlSearchParams()
+    }
+  }
+}
+
 function onSomeClicked(e){
   let cl = e.target.parentNode.id;
   switch(cl){
@@ -175,32 +197,29 @@ function onSomeClicked(e){
       onCategoryClicked(e.target,true/* isSecondary */);
       break;
     case "targets":
-      if(!e.target.classList.contains("selected")){
+      onFilenameClicked(e.target,e.ctrlKey);
-        if(e.ctrlKey && selectedTarget.getIt()){
+      
-          selectedTarget.add(e.target);
-          onTargetClicked(e.target,true);
-        }else{
-          selectedTarget.set(e.target);
-          onTargetClicked(e.target);
-        }
-      }
       break;
     default:
+    
       break;
   }
 }
 
 const selectedTarget = new(function(){
   const selected = new Set();
+  const state_object = {};
   this.set = (el) => {
     this.clear();
     el.classList.add("selected");
+    el.classList.remove("hidden");
     selected.add(el);
   }
   this.getIt = () =>{ return selected.values().next().value };
   this.add = (el) => {
     selected.add(el);
     el.classList.add("selected");
+    el.classList.remove("hidden");
   };
   this.deselect = (el) => {
     el.classList.remove("selected");
@@ -211,6 +230,13 @@ const selectedTarget = new(function(){
     selected.clear();
     return true
   }
+  this.setUrlSearchParams = () => {
+    let t = [];
+    for(let value of selected.values()){
+      t.push(value.getAttribute("title")+".css")
+    }
+    history.replaceState(state_object,"",`?file=${t.join(",")}`);
+  }
 })();
 
 function createCategories(){
@@ -277,7 +303,6 @@ function createCategories(){
   })();
   
   for(let cat of CAT_NAMES){
-  //  CAT_PARENT.appendChild(createCategory(cat.name))
     CAT_PARENT.appendChild(createNode(cat,"category"));
     CAT_SECOND.appendChild(createNode(cat,"category"));
   }
@@ -294,6 +319,8 @@ const Highlighter = new(function(){
     this.set = function(a){ previous = current; current = a; return} 
   })();
   
+  
+  
   let pointer = 0;
   let token = "";
   
@@ -303,10 +330,14 @@ const Highlighter = new(function(){
   [".","class"],
   ["[","attribute"]]);
 
-  this.parse = function(targetNode,text,appendMode){
+  this.parse = function(info,appendMode){
+    
+    const targetNode = document.getElementById("previewBox");
     
     !appendMode && clearCodeBlock();
-    let node = appendMode ? targetNode.firstChild : document.createElement("div");
+    
+    let node = document.createElement("div");
+    node.setAttribute("data-filename",info.file);
     
     function createNewRuleset(){
       let ruleset = document.createElement("span");
@@ -400,8 +431,9 @@ const Highlighter = new(function(){
     let c;
     let functionValueLevel = 0;
     let curly = false;
-    while(pointer < text.length){
+    
-      c = text[pointer];
+    while(pointer < info.content.length){
+      c = info.content[pointer];
       
       const currentState = state.now();
       curly = currentState != 2 && (c === "{" || c === "}");
@@ -413,7 +445,7 @@ const Highlighter = new(function(){
         case 0:
           switch(c){
             case "/":
-              if(text[pointer+1] === "*"){
+              if(info.content[pointer+1] === "*"){
                 state.set(2);
                 if(token.length > 1){
                   token = token.slice(0,-1);
@@ -438,7 +470,7 @@ const Highlighter = new(function(){
         case 2:
           switch(c){
             case "*":
-              if(text[pointer+1] === "/"){
+              if(info.content[pointer+1] === "/"){
                 token += "/";
                 pointer++;
                 state.set(state.previous());
@@ -450,7 +482,7 @@ const Highlighter = new(function(){
         case 3:
           switch(c){
             case "/":
-              if(text[pointer+1] === "*"){
+              if(info.content[pointer+1] === "*"){
                 state.set(2);
               }
               break;
@@ -521,8 +553,11 @@ const Highlighter = new(function(){
     state.set(0);
     pointer = 0;
     
-    targetNode.appendChild(node);
+    if(info.file.endsWith("support.css")){
-    
+      targetNode.prepend(node);
+    }else{
+      targetNode.appendChild(node);
+    }
     return
   }
   return this
@@ -549,13 +584,12 @@ async function handleSearchQuery(){
       return
     }
  
-    const codeBlock = document.querySelector("pre");   
     const promises = files.map(file=>fetchWithType(`chrome/${file}`).catch(e=>""));
     
     Promise.all(promises)
     .then(responses => {
-      showMatchingTargets(files);
+      showMatchingTargets(files,true);
-      Highlighter.parse(codeBlock,responses.join("\n\n/*************************************/\n\n"))
+      responses.forEach(Highlighter.parse)
     });
     
   }
@@ -584,7 +618,7 @@ document.onreadystatechange = (function () {
         }
         let fileName = ref.slice(ref.lastIndexOf("/"));
         if(fileName.endsWith(".css")){
-          onTargetClicked(fileName);
+          onFilenameClicked(fileName.slice(1,-4),ev.ctrlKey);
           ev.preventDefault();
         }
       }