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alle new

node_modules/mammoth/lib/html/simplify.js

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+var _ = require("underscore");
+
+var ast = require("./ast");
+
+function simplify(nodes) {
+    return collapse(removeEmpty(nodes));
+}
+
+function collapse(nodes) {
+    var children = [];
+    
+    nodes.map(collapseNode).forEach(function(child) {
+        appendChild(children, child);
+    });
+    return children;
+}
+
+function collapseNode(node) {
+    return collapsers[node.type](node);
+}
+
+var collapsers = {
+    element: collapseElement,
+    text: identity,
+    forceWrite: identity
+};
+
+function collapseElement(node) {
+    return ast.elementWithTag(node.tag, collapse(node.children));
+}
+
+function identity(value) {
+    return value;
+}
+
+function appendChild(children, child) {
+    var lastChild = children[children.length - 1];
+    if (child.type === "element" && !child.tag.fresh && lastChild && lastChild.type === "element" && child.tag.matchesElement(lastChild.tag)) {
+        if (child.tag.separator) {
+            appendChild(lastChild.children, ast.text(child.tag.separator));
+        }
+        child.children.forEach(function(grandChild) {
+            // Mutation is fine since simplifying elements create a copy of the children.
+            appendChild(lastChild.children, grandChild);
+        });
+    } else {
+        children.push(child);
+    }
+}
+
+function removeEmpty(nodes) {
+    return flatMap(nodes, function(node) {
+        return emptiers[node.type](node);
+    });
+}
+
+function flatMap(values, func) {
+    return _.flatten(_.map(values, func), true);
+}
+
+var emptiers = {
+    element: elementEmptier,
+    text: textEmptier,
+    forceWrite: neverEmpty
+};
+
+function neverEmpty(node) {
+    return [node];
+}
+
+function elementEmptier(element) {
+    var children = removeEmpty(element.children);
+    if (children.length === 0 && !ast.isVoidElement(element)) {
+        return [];
+    } else {
+        return [ast.elementWithTag(element.tag, children)];
+    }
+}
+
+function textEmptier(node) {
+    if (node.value.length === 0) {
+        return [];
+    } else {
+        return [node];
+    }
+}
+
+module.exports = simplify;