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