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node_modules/mammoth/lib/docx/numbering-xml.js

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+var _ = require("underscore");
+
+exports.readNumberingXml = readNumberingXml;
+exports.Numbering = Numbering;
+exports.defaultNumbering = new Numbering({}, {});
+
+function Numbering(nums, abstractNums, styles) {
+    var allLevels = _.flatten(_.values(abstractNums).map(function(abstractNum) {
+        return _.values(abstractNum.levels);
+    }));
+
+    var levelsByParagraphStyleId = _.indexBy(
+        allLevels.filter(function(level) {
+            return level.paragraphStyleId != null;
+        }),
+        "paragraphStyleId"
+    );
+
+    function findLevel(numId, level) {
+        return findLevelWithSeenNumIds(numId, level, Object.create(null));
+    }
+
+    function findLevelWithSeenNumIds(numId, level, seenNumIds) {
+        if (seenNumIds[numId]) {
+            return null;
+        }
+        seenNumIds[numId] = true;
+
+        var num = nums[numId];
+        if (!num) {
+            return null;
+        }
+
+        var abstractNum = abstractNums[num.abstractNumId];
+        if (!abstractNum) {
+            return null;
+        } else if (abstractNum.numStyleLink == null) {
+            return abstractNums[num.abstractNumId].levels[level];
+        } else {
+            var style = styles.findNumberingStyleById(abstractNum.numStyleLink);
+            return findLevelWithSeenNumIds(style.numId, level, seenNumIds);
+        }
+    }
+
+    function findLevelByParagraphStyleId(styleId) {
+        return levelsByParagraphStyleId[styleId] || null;
+    }
+
+    return {
+        findLevel: findLevel,
+        findLevelByParagraphStyleId: findLevelByParagraphStyleId
+    };
+}
+
+function readNumberingXml(root, options) {
+    if (!options || !options.styles) {
+        throw new Error("styles is missing");
+    }
+
+    var abstractNums = readAbstractNums(root);
+    var nums = readNums(root, abstractNums);
+    return new Numbering(nums, abstractNums, options.styles);
+}
+
+function readAbstractNums(root) {
+    var abstractNums = Object.create(null);
+    root.getElementsByTagName("w:abstractNum").forEach(function(element) {
+        var id = element.attributes["w:abstractNumId"];
+        abstractNums[id] = readAbstractNum(element);
+    });
+    return abstractNums;
+}
+
+function readAbstractNum(element) {
+    var levels = Object.create(null);
+
+    // Some malformed documents define numbering levels without an index, and
+    // reference the numbering using a w:numPr element without a w:ilvl child.
+    // To handle such cases, we assume a level of 0 as a fallback.
+    var levelWithoutIndex = null;
+
+    element.getElementsByTagName("w:lvl").forEach(function(levelElement) {
+        var levelIndex = levelElement.attributes["w:ilvl"];
+        var numFmt = levelElement.firstOrEmpty("w:numFmt").attributes["w:val"];
+        var isOrdered = numFmt !== "bullet";
+        var paragraphStyleId = levelElement.firstOrEmpty("w:pStyle").attributes["w:val"];
+
+        if (levelIndex === undefined) {
+            levelWithoutIndex = {
+                isOrdered: isOrdered,
+                level: "0",
+                paragraphStyleId: paragraphStyleId
+            };
+        } else {
+            levels[levelIndex] = {
+                isOrdered: isOrdered,
+                level: levelIndex,
+                paragraphStyleId: paragraphStyleId
+            };
+        }
+    });
+
+    if (levelWithoutIndex !== null && levels[levelWithoutIndex.level] === undefined) {
+        levels[levelWithoutIndex.level] = levelWithoutIndex;
+    }
+
+    var numStyleLink = element.firstOrEmpty("w:numStyleLink").attributes["w:val"];
+
+    return {levels: levels, numStyleLink: numStyleLink};
+}
+
+function readNums(root) {
+    var nums = Object.create(null);
+    root.getElementsByTagName("w:num").forEach(function(element) {
+        var numId = element.attributes["w:numId"];
+        var abstractNumId = element.first("w:abstractNumId").attributes["w:val"];
+        nums[numId] = {abstractNumId: abstractNumId};
+    });
+    return nums;
+}