307 lines
12 KiB
JavaScript
307 lines
12 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.printComments = exports.attach = void 0;
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var tslib_1 = require("tslib");
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var assert_1 = tslib_1.__importDefault(require("assert"));
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var types = tslib_1.__importStar(require("ast-types"));
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var n = types.namedTypes;
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var isArray = types.builtInTypes.array;
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var isObject = types.builtInTypes.object;
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var lines_1 = require("./lines");
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var util_1 = require("./util");
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var childNodesCache = new WeakMap();
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// TODO Move a non-caching implementation of this function into ast-types,
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// and implement a caching wrapper function here.
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function getSortedChildNodes(node, lines, resultArray) {
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if (!node) {
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return resultArray;
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}
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// The .loc checks below are sensitive to some of the problems that
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// are fixed by this utility function. Specifically, if it decides to
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// set node.loc to null, indicating that the node's .loc information
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// is unreliable, then we don't want to add node to the resultArray.
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util_1.fixFaultyLocations(node, lines);
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if (resultArray) {
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if (n.Node.check(node) && n.SourceLocation.check(node.loc)) {
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// This reverse insertion sort almost always takes constant
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// time because we almost always (maybe always?) append the
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// nodes in order anyway.
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var i = resultArray.length - 1;
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for (; i >= 0; --i) {
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var child = resultArray[i];
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if (child &&
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child.loc &&
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util_1.comparePos(child.loc.end, node.loc.start) <= 0) {
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break;
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}
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}
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resultArray.splice(i + 1, 0, node);
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return resultArray;
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}
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}
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else {
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var childNodes = childNodesCache.get(node);
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if (childNodes) {
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return childNodes;
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}
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}
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var names;
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if (isArray.check(node)) {
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names = Object.keys(node);
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}
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else if (isObject.check(node)) {
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names = types.getFieldNames(node);
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}
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else {
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return resultArray;
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}
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if (!resultArray) {
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childNodesCache.set(node, (resultArray = []));
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}
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for (var i = 0, nameCount = names.length; i < nameCount; ++i) {
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getSortedChildNodes(node[names[i]], lines, resultArray);
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}
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return resultArray;
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}
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// As efficiently as possible, decorate the comment object with
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// .precedingNode, .enclosingNode, and/or .followingNode properties, at
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// least one of which is guaranteed to be defined.
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function decorateComment(node, comment, lines) {
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var childNodes = getSortedChildNodes(node, lines);
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// Time to dust off the old binary search robes and wizard hat.
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var left = 0;
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var right = childNodes && childNodes.length;
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var precedingNode;
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var followingNode;
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while (typeof right === "number" && left < right) {
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var middle = (left + right) >> 1;
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var child = childNodes[middle];
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if (util_1.comparePos(child.loc.start, comment.loc.start) <= 0 &&
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util_1.comparePos(comment.loc.end, child.loc.end) <= 0) {
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// The comment is completely contained by this child node.
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decorateComment((comment.enclosingNode = child), comment, lines);
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return; // Abandon the binary search at this level.
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}
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if (util_1.comparePos(child.loc.end, comment.loc.start) <= 0) {
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// This child node falls completely before the comment.
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// Because we will never consider this node or any nodes
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// before it again, this node must be the closest preceding
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// node we have encountered so far.
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precedingNode = child;
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left = middle + 1;
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continue;
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}
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if (util_1.comparePos(comment.loc.end, child.loc.start) <= 0) {
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// This child node falls completely after the comment.
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// Because we will never consider this node or any nodes after
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// it again, this node must be the closest following node we
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// have encountered so far.
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followingNode = child;
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right = middle;
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continue;
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}
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throw new Error("Comment location overlaps with node location");
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}
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if (precedingNode) {
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comment.precedingNode = precedingNode;
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}
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if (followingNode) {
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comment.followingNode = followingNode;
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}
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}
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function attach(comments, ast, lines) {
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if (!isArray.check(comments)) {
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return;
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}
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var tiesToBreak = [];
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comments.forEach(function (comment) {
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comment.loc.lines = lines;
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decorateComment(ast, comment, lines);
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var pn = comment.precedingNode;
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var en = comment.enclosingNode;
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var fn = comment.followingNode;
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if (pn && fn) {
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var tieCount = tiesToBreak.length;
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if (tieCount > 0) {
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var lastTie = tiesToBreak[tieCount - 1];
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assert_1.default.strictEqual(lastTie.precedingNode === comment.precedingNode, lastTie.followingNode === comment.followingNode);
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if (lastTie.followingNode !== comment.followingNode) {
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breakTies(tiesToBreak, lines);
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}
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}
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tiesToBreak.push(comment);
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}
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else if (pn) {
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// No contest: we have a trailing comment.
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breakTies(tiesToBreak, lines);
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addTrailingComment(pn, comment);
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}
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else if (fn) {
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// No contest: we have a leading comment.
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breakTies(tiesToBreak, lines);
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addLeadingComment(fn, comment);
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}
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else if (en) {
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// The enclosing node has no child nodes at all, so what we
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// have here is a dangling comment, e.g. [/* crickets */].
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breakTies(tiesToBreak, lines);
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addDanglingComment(en, comment);
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}
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else {
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throw new Error("AST contains no nodes at all?");
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}
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});
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breakTies(tiesToBreak, lines);
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comments.forEach(function (comment) {
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// These node references were useful for breaking ties, but we
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// don't need them anymore, and they create cycles in the AST that
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// may lead to infinite recursion if we don't delete them here.
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delete comment.precedingNode;
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delete comment.enclosingNode;
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delete comment.followingNode;
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});
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}
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exports.attach = attach;
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function breakTies(tiesToBreak, lines) {
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var tieCount = tiesToBreak.length;
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if (tieCount === 0) {
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return;
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}
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var pn = tiesToBreak[0].precedingNode;
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var fn = tiesToBreak[0].followingNode;
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var gapEndPos = fn.loc.start;
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// Iterate backwards through tiesToBreak, examining the gaps
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// between the tied comments. In order to qualify as leading, a
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// comment must be separated from fn by an unbroken series of
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// whitespace-only gaps (or other comments).
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var indexOfFirstLeadingComment = tieCount;
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var comment;
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for (; indexOfFirstLeadingComment > 0; --indexOfFirstLeadingComment) {
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comment = tiesToBreak[indexOfFirstLeadingComment - 1];
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assert_1.default.strictEqual(comment.precedingNode, pn);
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assert_1.default.strictEqual(comment.followingNode, fn);
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var gap = lines.sliceString(comment.loc.end, gapEndPos);
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if (/\S/.test(gap)) {
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// The gap string contained something other than whitespace.
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break;
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}
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gapEndPos = comment.loc.start;
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}
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while (indexOfFirstLeadingComment <= tieCount &&
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(comment = tiesToBreak[indexOfFirstLeadingComment]) &&
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// If the comment is a //-style comment and indented more
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// deeply than the node itself, reconsider it as trailing.
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(comment.type === "Line" || comment.type === "CommentLine") &&
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comment.loc.start.column > fn.loc.start.column) {
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++indexOfFirstLeadingComment;
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}
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tiesToBreak.forEach(function (comment, i) {
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if (i < indexOfFirstLeadingComment) {
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addTrailingComment(pn, comment);
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}
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else {
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addLeadingComment(fn, comment);
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}
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});
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tiesToBreak.length = 0;
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}
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function addCommentHelper(node, comment) {
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var comments = node.comments || (node.comments = []);
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comments.push(comment);
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}
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function addLeadingComment(node, comment) {
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comment.leading = true;
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comment.trailing = false;
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addCommentHelper(node, comment);
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}
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function addDanglingComment(node, comment) {
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comment.leading = false;
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comment.trailing = false;
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addCommentHelper(node, comment);
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}
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function addTrailingComment(node, comment) {
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comment.leading = false;
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comment.trailing = true;
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addCommentHelper(node, comment);
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}
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function printLeadingComment(commentPath, print) {
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var comment = commentPath.getValue();
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n.Comment.assert(comment);
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var loc = comment.loc;
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var lines = loc && loc.lines;
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var parts = [print(commentPath)];
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if (comment.trailing) {
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// When we print trailing comments as leading comments, we don't
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// want to bring any trailing spaces along.
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parts.push("\n");
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}
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else if (lines instanceof lines_1.Lines) {
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var trailingSpace = lines.slice(loc.end, lines.skipSpaces(loc.end) || lines.lastPos());
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if (trailingSpace.length === 1) {
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// If the trailing space contains no newlines, then we want to
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// preserve it exactly as we found it.
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parts.push(trailingSpace);
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}
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else {
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// If the trailing space contains newlines, then replace it
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// with just that many newlines, with all other spaces removed.
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parts.push(new Array(trailingSpace.length).join("\n"));
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}
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}
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else {
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parts.push("\n");
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}
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return lines_1.concat(parts);
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}
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function printTrailingComment(commentPath, print) {
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var comment = commentPath.getValue(commentPath);
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n.Comment.assert(comment);
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var loc = comment.loc;
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var lines = loc && loc.lines;
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var parts = [];
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if (lines instanceof lines_1.Lines) {
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var fromPos = lines.skipSpaces(loc.start, true) || lines.firstPos();
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var leadingSpace = lines.slice(fromPos, loc.start);
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if (leadingSpace.length === 1) {
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// If the leading space contains no newlines, then we want to
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// preserve it exactly as we found it.
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parts.push(leadingSpace);
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}
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else {
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// If the leading space contains newlines, then replace it
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// with just that many newlines, sans all other spaces.
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parts.push(new Array(leadingSpace.length).join("\n"));
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}
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}
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parts.push(print(commentPath));
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return lines_1.concat(parts);
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}
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function printComments(path, print) {
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var value = path.getValue();
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var innerLines = print(path);
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var comments = n.Node.check(value) && types.getFieldValue(value, "comments");
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if (!comments || comments.length === 0) {
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return innerLines;
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}
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var leadingParts = [];
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var trailingParts = [innerLines];
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path.each(function (commentPath) {
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var comment = commentPath.getValue();
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var leading = types.getFieldValue(comment, "leading");
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var trailing = types.getFieldValue(comment, "trailing");
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if (leading ||
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(trailing &&
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!(n.Statement.check(value) ||
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comment.type === "Block" ||
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comment.type === "CommentBlock"))) {
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leadingParts.push(printLeadingComment(commentPath, print));
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}
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else if (trailing) {
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trailingParts.push(printTrailingComment(commentPath, print));
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}
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}, "comments");
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leadingParts.push.apply(leadingParts, trailingParts);
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return lines_1.concat(leadingParts);
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}
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exports.printComments = printComments;
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