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app_vue/node_modules/@vue/component-compiler-utils/dist/templateCompilerModules/srcset.js

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+"use strict";
+// vue compiler module for transforming `img:srcset` to a number of `require`s
+Object.defineProperty(exports, "__esModule", { value: true });
+const utils_1 = require("./utils");
+exports.default = (transformAssetUrlsOptions) => ({
+    postTransformNode: (node) => {
+        transform(node, transformAssetUrlsOptions);
+    }
+});
+// http://w3c.github.io/html/semantics-embedded-content.html#ref-for-image-candidate-string-5
+const escapedSpaceCharacters = /( |\\t|\\n|\\f|\\r)+/g;
+function transform(node, transformAssetUrlsOptions) {
+    const tags = ['img', 'source'];
+    if (tags.indexOf(node.tag) !== -1 && node.attrs) {
+        node.attrs.forEach(attr => {
+            if (attr.name === 'srcset') {
+                // same logic as in transform-require.js
+                const value = attr.value;
+                const isStatic = value.charAt(0) === '"' && value.charAt(value.length - 1) === '"';
+                if (!isStatic) {
+                    return;
+                }
+                const imageCandidates = value
+                    .substr(1, value.length - 2)
+                    .split(',')
+                    .map(s => {
+                    // The attribute value arrives here with all whitespace, except
+                    // normal spaces, represented by escape sequences
+                    const [url, descriptor] = s
+                        .replace(escapedSpaceCharacters, ' ')
+                        .trim()
+                        .split(' ', 2);
+                    return {
+                        require: utils_1.urlToRequire(url, transformAssetUrlsOptions),
+                        descriptor
+                    };
+                });
+                // "require(url1)"
+                // "require(url1) 1x"
+                // "require(url1), require(url2)"
+                // "require(url1), require(url2) 2x"
+                // "require(url1) 1x, require(url2)"
+                // "require(url1) 1x, require(url2) 2x"
+                const code = imageCandidates
+                    .map(({ require, descriptor }) => `${require} + "${descriptor ? ' ' + descriptor : ''}, " + `)
+                    .join('')
+                    .slice(0, -6)
+                    .concat('"')
+                    .replace(/ \+ ""$/, '');
+                attr.value = code;
+            }
+        });
+    }
+}