Build a CSS to Javascript Inline Styles Objects Converter in Browser Using Vanilla Javascript Full Project For Beginners

Build a CSS to Javascript Inline Styles Objects Converter in Browser Using Vanilla Javascript Full Project For Beginners

 

Welcome folks today in this blog post we will be building a css to javascript inline styles objects converter in browser using vanilla javascript.All the full source code of the application is shown below.

 

 

 

Get Started

 

 

 

In order to get started you need to make an index.html file and copy paste the following code

 

 

index.html

 

 

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.0/css/materialize.min.css"/>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.6/styles/default.min.css"/>

<div class="container">
  <div class="section">
    <h5>Conversion between CSS -> Inline JS Style</h5>
    <p>Stuff</p>
  </div>
  <div class="divider"></div>
  <div class="row">

    <div class="input-field  col s6">
      <textarea class="materialize-textarea"></textarea>
      <label for="textarea1">put here your css</label>
    </div>
    <div class="input-field col s6">

      <pre style="margin-top: 40px" class="z-depth-1"><code class="js">...</code></pre>
      <label for="textarea1">JS here!</label>
    </div>
  </div>


</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.0/js/materialize.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.6/highlight.min.js"></script>
<script>
  hljs.initHighlightingOnLoad();
var SPACE = '    ';
function toProperty(name){
 
    if(name.charAt(0) == "-") name = name.slice(0);

    return name.replace(/[^a-z0-9]([a-z0-9])?/gi, function(v, l){
           if(l) return l.toUpperCase();
           return "";
    }) ;

}

function toSelectors(name){
    var names = name.split(",");

    return names.map(function(name){
    name = name.trim();
        var newName = "";

        if(name.charAt(0) == "."){
            newName += "Class";
            name = name.slice(1);
        }else if(name.charAt(0) == "#"){
            newName += "Id";
            name = name.slice(1);
        }else{
            newName += "Element";
        }

        return name.replace(/([^a-z0-9])([a-z0-9])?/gi, function(v, c, l){
               if(l) return (c == "," || c == " ") ?  l.toLowerCase() : l.toUpperCase();
               return "";
        }) + newName;

    });

}

function tokenizer(code){

    var tokens = [];
    var token = '';
    var whitespc = ['\r\n', '\n\r', '\n', '\r'];
    var lastChar = '\0';
    var nextChar = '\0';
    var char = '\0';
    var specialChars = ["{","}",":",";"];
    var specialCharsPB = ["{","}",";"];
    var sc = null;
    var inBrackets = false;

    for(var i = 0; i < code.length; i++){

        if(i) lastChar = code.charAt(i-1);
        char = code.charAt(i);
        if(i+1 < code.length) nextChar = code.charAt(i+1);

        if(~whitespc.indexOf(char) && ~whitespc.indexOf(lastChar)){
            continue;
        }
 
        sc = inBrackets ? specialChars : specialCharsPB;

        

        if(~sc.indexOf(char)){
            if(char == "{") inBrackets = true;
            if(char == "}") inBrackets = false;
            tokens.push(token);
            tokens.push(char);
            token = '';         
            continue;
        }

        token += char;

    }

    if(token) tokens.push(token);


    return tokens
            .map(function(token){ return token.trim(); })
            .filter(function(token){ return token; });

}

function repeat(char, times){
    if(times) return repeat(char, times-1) + char;
    return "";
}

function convertoToJS(tokens){

    var items = [];
    var actualItem = null;
    var actualProp = null;
    debugger;
    function readSelector(token){

         
        var selectors = toSelectors(token);

        actualItem = {
            originalValue: token,
            selectors: selectors,
            values: {}
        };

        actualProp = null;
        items.push(actualItem);

        return readBracketO;
    }

    function readBracketO(token){

        if(token != "{") throw new Error("Era esperado um '{' ");

        return readProperty;
    }

    function readBracketC(token){
        if(token != "}") throw new Error("Era esperado um '}' ");
        return readSelector;
    }

    function readDefinition(token){
        if(token != ":") throw new Error("Era esperado um ':' ");

        return readValue;
    }

    function readProperty(token){

        if(token == "}") return readBracketC(token);

        var property = toProperty(token);
        actualProp = property;

        if(!actualItem.values[property]){
            actualItem.values[property] = [];
        }

        return readDefinition;
    }

    function readValue(token){

        actualItem.values[actualProp].push(token);

        return readFinal;
    }

    function readFinal(token){
        if(token == "}") return readBracketC(token);
        if(token != ";")  throw new Error("Era esperado um ';' ");
        return readProperty;
    }

 
    var nextAction = readSelector;
    var i = 0;
    tokens.forEach(function(token){
        i++;
        console.log("processing " + i);
        nextAction = nextAction(token);     

    });

    return renderJS(items);

}

function renderJS(items){

    var objects = ["var styles = {"];
    objects = objects.concat(items.map(renderItem).join(","));
    objects.push("}");
    return objects.join("\n");
}

function renderItem(item){

    var code = ["\n//" + item.originalValue];

    var properties = [];

    for(var prop in item.values){

        var propitem = {
            name: prop,
            value: item.values[prop][item.values[prop].length - 1]
        };
        var markup = '"';
        if(~propitem.value.indexOf('"')) {
      markup = "'";
      propitem.value = propitem.value.replace(/'/gi, "\\'");
    }
        properties.push(SPACE + SPACE +  propitem.name + ": " + markup + propitem.value + markup);

    }

    properties = properties.map(function(x){ return SPACE +  x; });

    item.selectors.forEach(function(i){

        code.push(SPACE + i + ": {");
        code.push(properties.join(",\n"));
        code.push(SPACE + "}");

    });

    return code.join("\n");

}

var txt = document.querySelector("textarea");
var code = document.querySelector("code");


txt.addEventListener("change", function(){

    window.tokens = tokenizer(txt.value);
    code.textContent = convertoToJS(window.tokens);
});



</script>

 

See also  Build a Breakout Ball Tiles Game in Browser Using HTML5 CSS3 and Javascript Full Project For Beginners

 

 

Now if you open the index.html file inside the browser you will see the below screenshot

 

 

 

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