Website Structure

Frontend-Learner/node_modules/regexp-tree/dist/transform/utils.js

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+/**
+ * The MIT License (MIT)
+ * Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
+ */
+
+'use strict';
+
+/**
+ * Flattens a nested disjunction node to a list.
+ *
+ * /a|b|c|d/
+ *
+ * {{{a, b}, c}, d} -> [a, b, c, d]
+ */
+
+function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
+
+function disjunctionToList(node) {
+  if (node.type !== 'Disjunction') {
+    throw new TypeError('Expected "Disjunction" node, got "' + node.type + '"');
+  }
+
+  var list = [];
+
+  if (node.left && node.left.type === 'Disjunction') {
+    list.push.apply(list, _toConsumableArray(disjunctionToList(node.left)).concat([node.right]));
+  } else {
+    list.push(node.left, node.right);
+  }
+
+  return list;
+}
+
+/**
+ * Builds a nested disjunction node from a list.
+ *
+ * /a|b|c|d/
+ *
+ * [a, b, c, d] -> {{{a, b}, c}, d}
+ */
+function listToDisjunction(list) {
+  return list.reduce(function (left, right) {
+    return {
+      type: 'Disjunction',
+      left: left,
+      right: right
+    };
+  });
+}
+
+/**
+ * Increases a quantifier by one.
+ * Does not change greediness.
+ * * -> +
+ * + -> {2,}
+ * ? -> {1,2}
+ * {2} -> {3}
+ * {2,} -> {3,}
+ * {2,3} -> {3,4}
+ */
+function increaseQuantifierByOne(quantifier) {
+  if (quantifier.kind === '*') {
+
+    quantifier.kind = '+';
+  } else if (quantifier.kind === '+') {
+
+    quantifier.kind = 'Range';
+    quantifier.from = 2;
+    delete quantifier.to;
+  } else if (quantifier.kind === '?') {
+
+    quantifier.kind = 'Range';
+    quantifier.from = 1;
+    quantifier.to = 2;
+  } else if (quantifier.kind === 'Range') {
+
+    quantifier.from += 1;
+    if (quantifier.to) {
+      quantifier.to += 1;
+    }
+  }
+}
+
+module.exports = {
+  disjunctionToList: disjunctionToList,
+  listToDisjunction: listToDisjunction,
+  increaseQuantifierByOne: increaseQuantifierByOne
+};