webpack shader loader with uncomment

Tools/WebpackShaderLoader/index.js

@@ -0,0 +1,139 @@
+//modified https://github.com/grieve/webpack-glsl-loader/blob/master/index.js
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+
+
+function parse(loader, source, context, cb) {
+    var imports = [];
+    var importPattern = /@import ([.\/\w_-]+);/gi;
+    var match = importPattern.exec(source);
+
+    while (match != null) {
+        imports.push({
+            key: match[1],
+            target: match[0],
+            content: ''
+        });
+        match = importPattern.exec(source);
+    }
+
+    source = uncomment(source);
+
+    processImports(loader, source, context, imports, cb);
+}
+
+var singleComment = 1;
+var multiComment = 2;
+
+function uncomment(str) {
+
+    var currentChar;
+    var nextChar;
+    var insideString = false;
+    var insideComment = 0;
+    var offset = 0;
+    var ret = '';
+
+    str = str.replace(/\r\n/g, '\n');
+    str = str.replace(/[ \f\t\v]+/g, ' ');
+    str = str.replace(/^\s*\n/gm, '');
+    str = str.replace(/ \+ /g, '+');
+    str = str.replace(/ \- /g, '-');
+    str = str.replace(/ \/ /g, '/');
+    str = str.replace(/ \* /g, '*');
+    str = str.replace(/ > /g, '>');
+    str = str.replace(/ < /g, '<');
+    str = str.replace(/ >= /g, '>=');
+    str = str.replace(/ <= /g, '<=');
+    str = str.replace(/ \+= /g, '+=');
+    str = str.replace(/ \-= /g, '-=');
+    str = str.replace(/ \/= /g, '/=');
+    str = str.replace(/ \*= /g, '*=');
+    str = str.replace(/ = /g, '=');
+    str = str.replace(/, /g, ',');
+    str = str.replace(/\n\n/g, '\n');
+    str = str.replace(/\n /g, '\n');
+
+    for (var i = 0; i < str.length; i++) {
+        currentChar = str[i];
+        nextChar = str[i + 1];
+
+        if (!insideComment && currentChar === '"') {
+            var escaped = str[i - 1] === '\\' && str[i - 2] !== '\\';
+            if (!escaped) {
+                insideString = !insideString;
+            }
+        }
+
+        if (insideString) {
+            continue;
+        }
+
+        if (!insideComment && currentChar + nextChar === '//') {
+            ret += str.slice(offset, i);
+            offset = i;
+            insideComment = singleComment;
+            i++;
+        } else if (insideComment === singleComment && currentChar === '\n') {
+            insideComment = 0;
+            offset = i;
+        } else if (!insideComment && currentChar + nextChar === '/*') {
+            ret += str.slice(offset, i);
+            offset = i;
+            insideComment = multiComment;
+            i++;
+            continue;
+        } else if (insideComment === multiComment && currentChar + nextChar === '*/') {
+            i++;
+            insideComment = 0;
+            offset = i + 1;
+            continue;
+        }
+    }
+
+    return ret + (insideComment ? '' : str.substr(offset));
+}
+
+function processImports(loader, source, context, imports, cb) {
+    if (imports.length === 0) {
+        return cb(null, source);
+    }
+
+    var imp = imports.pop();
+
+    loader.resolve(context, imp.key + '.fx', function (err, resolved) {
+        if (err) {
+            return cb(err);
+        }
+
+        loader.addDependency(resolved);
+        fs.readFile(resolved, 'utf-8', function (err, src) {
+            if (err) {
+                return cb(err);
+            }
+
+            parse(loader, src, path.dirname(resolved), function (err, bld) {
+                if (err) {
+                    return cb(err);
+                }
+
+                source = source.replace(imp.target, bld);
+                processImports(loader, source, context, imports, cb);
+            });
+        });
+    });
+}
+
+module.exports = function (source) {
+    this.cacheable();
+    var cb = this.async();
+    parse(this, source, this.context, function (err, bld) {
+        if (err) {
+            return cb(err);
+        }
+
+        cb(null, 'module.exports = ' + JSON.stringify(bld));
+    });
+};