Refactor trailing comma comment adjustment (#10380)

* Refactor trailing comment adjustment

Following up from https://github.com/babel/babel/pull/10369

- Unify the logic for adjusting trailing comments into a separate
  function
- Use it for all three cases, which fixes a bug for ObjectExpressions
  and CallExpressions
- Update tests to check for the fixed bug

* Fix tests

- Only modify trailingComments if necessary
- Update snapshots of a couple of affected tests

* Drop the underscore in adjustCommentsAfterTrailingComma_

* Handle ArrayPattern

* Handle ObjectPattern

* Handle import and export declarations

These have to be handled a bit differently, because the  node is visited after the  and before the declaration. So we intercept when we are going from the last specifier to the source node.

* Remove unnecessary check
This commit is contained in:
Shrey Banga 2019-09-02 17:35:15 -07:00 committed by Huáng Jùnliàng
parent e5afa57cca
commit c0e3fa0081
17 changed files with 1322 additions and 155 deletions

View File

@ -38,6 +38,45 @@ export default class CommentsParser extends BaseParser {
this.state.leadingComments.push(comment);
}
adjustCommentsAfterTrailingComma(node: Node, elements: Node[]) {
if (elements.length === 0) {
return;
}
if (this.state.leadingComments.length === 0) {
return;
}
const lastElement = last(elements);
for (let j = 0; j < this.state.leadingComments.length; j++) {
if (
this.state.leadingComments[j].end < this.state.commentPreviousNode.end
) {
this.state.leadingComments.splice(j, 1);
j--;
}
}
const newTrailingComments = [];
while (this.state.leadingComments.length) {
const leadingComment = this.state.leadingComments.shift();
if (leadingComment.end < node.end) {
newTrailingComments.push(leadingComment);
} else {
if (node.trailingComments === undefined) {
node.trailingComments = [];
}
node.trailingComments.push(leadingComment);
}
}
if (newTrailingComments.length > 0) {
lastElement.trailingComments = newTrailingComments;
} else if (lastElement.trailingComments !== undefined) {
lastElement.trailingComments = [];
}
}
processComment(node: Node): void {
if (node.type === "Program" && node.body.length > 0) return;
@ -84,86 +123,33 @@ export default class CommentsParser extends BaseParser {
if (!lastChild && firstChild) lastChild = firstChild;
// Attach comments that follow a trailing comma on the last
// property in an object literal or a trailing comma in function arguments
// or a trailing comma in array expressions as trailing comments
if (firstChild && this.state.leadingComments.length > 0) {
const lastComment = last(this.state.leadingComments);
if (firstChild.type === "ObjectProperty") {
if (lastComment.start >= node.start && lastComment.end <= node.end) {
if (this.state.commentPreviousNode) {
for (j = 0; j < this.state.leadingComments.length; j++) {
if (
this.state.leadingComments[j].end <
this.state.commentPreviousNode.end
) {
this.state.leadingComments.splice(j, 1);
j--;
}
}
if (this.state.leadingComments.length > 0) {
firstChild.trailingComments = this.state.leadingComments;
this.state.leadingComments = [];
}
}
// Adjust comments that follow a trailing comma on the last element in a
// comma separated list of nodes to be the trailing comments on the last
// element
if (firstChild) {
switch (node.type) {
case "ObjectExpression":
case "ObjectPattern":
this.adjustCommentsAfterTrailingComma(node, node.properties);
break;
case "CallExpression":
this.adjustCommentsAfterTrailingComma(node, node.arguments);
break;
case "ArrayExpression":
case "ArrayPattern":
this.adjustCommentsAfterTrailingComma(node, node.elements);
break;
}
} else if (
node.type === "CallExpression" &&
node.arguments &&
node.arguments.length
this.state.commentPreviousNode &&
((this.state.commentPreviousNode.type === "ImportSpecifier" &&
node.type !== "ImportSpecifier") ||
(this.state.commentPreviousNode.type === "ExportSpecifier" &&
node.type !== "ExportSpecifier"))
) {
const lastArg = last(node.arguments);
if (
lastArg &&
lastComment.start >= lastArg.start &&
lastComment.end <= node.end
) {
if (this.state.commentPreviousNode) {
for (j = 0; j < this.state.leadingComments.length; j++) {
if (
this.state.leadingComments[j].end <
this.state.commentPreviousNode.end
) {
this.state.leadingComments.splice(j, 1);
j--;
}
}
if (this.state.leadingComments.length > 0) {
lastArg.trailingComments = this.state.leadingComments;
this.state.leadingComments = [];
}
}
}
} else if (node.type === "ArrayExpression" && node.elements.length > 0) {
if (this.state.commentPreviousNode) {
for (j = 0; j < this.state.leadingComments.length; j++) {
if (
this.state.leadingComments[j].end <
this.state.commentPreviousNode.end
) {
this.state.leadingComments.splice(j, 1);
j--;
}
}
const lastElement = last(node.elements);
lastElement.trailingComments = [];
while (this.state.leadingComments.length) {
const leadingComment = this.state.leadingComments.shift();
if (leadingComment.end < node.end) {
lastElement.trailingComments.push(leadingComment);
} else {
if (node.trailingComments === undefined) {
node.trailingComments = [];
}
node.trailingComments.push(leadingComment);
}
}
}
}
this.adjustCommentsAfterTrailingComma(node, [
this.state.commentPreviousNode,
]);
}
if (lastChild) {

View File

@ -0,0 +1,6 @@
const [
/* One */
x
/* Two */,
/* Three */
] /* Four */ = [];

View File

@ -0,0 +1,254 @@
{
"type": "File",
"start": 0,
"end": 69,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 6,
"column": 18
}
},
"program": {
"type": "Program",
"start": 0,
"end": 69,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 6,
"column": 18
}
},
"sourceType": "script",
"interpreter": null,
"body": [
{
"type": "VariableDeclaration",
"start": 0,
"end": 69,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 6,
"column": 18
}
},
"declarations": [
{
"type": "VariableDeclarator",
"start": 6,
"end": 68,
"loc": {
"start": {
"line": 1,
"column": 6
},
"end": {
"line": 6,
"column": 17
}
},
"id": {
"type": "ArrayPattern",
"start": 6,
"end": 52,
"loc": {
"start": {
"line": 1,
"column": 6
},
"end": {
"line": 6,
"column": 1
}
},
"elements": [
{
"type": "Identifier",
"start": 22,
"end": 23,
"loc": {
"start": {
"line": 3,
"column": 2
},
"end": {
"line": 3,
"column": 3
},
"identifierName": "x"
},
"name": "x",
"leadingComments": [
{
"type": "CommentBlock",
"value": " One ",
"start": 10,
"end": 19,
"loc": {
"start": {
"line": 2,
"column": 2
},
"end": {
"line": 2,
"column": 11
}
}
}
],
"trailingComments": [
{
"type": "CommentBlock",
"value": " Two ",
"start": 26,
"end": 35,
"loc": {
"start": {
"line": 4,
"column": 2
},
"end": {
"line": 4,
"column": 11
}
}
},
{
"type": "CommentBlock",
"value": " Three ",
"start": 39,
"end": 50,
"loc": {
"start": {
"line": 5,
"column": 2
},
"end": {
"line": 5,
"column": 13
}
}
}
]
}
],
"trailingComments": [
{
"type": "CommentBlock",
"value": " Four ",
"start": 53,
"end": 63,
"loc": {
"start": {
"line": 6,
"column": 2
},
"end": {
"line": 6,
"column": 12
}
}
}
]
},
"init": {
"type": "ArrayExpression",
"start": 66,
"end": 68,
"loc": {
"start": {
"line": 6,
"column": 15
},
"end": {
"line": 6,
"column": 17
}
},
"elements": []
}
}
],
"kind": "const"
}
],
"directives": []
},
"comments": [
{
"type": "CommentBlock",
"value": " One ",
"start": 10,
"end": 19,
"loc": {
"start": {
"line": 2,
"column": 2
},
"end": {
"line": 2,
"column": 11
}
}
},
{
"type": "CommentBlock",
"value": " Two ",
"start": 26,
"end": 35,
"loc": {
"start": {
"line": 4,
"column": 2
},
"end": {
"line": 4,
"column": 11
}
}
},
{
"type": "CommentBlock",
"value": " Three ",
"start": 39,
"end": 50,
"loc": {
"start": {
"line": 5,
"column": 2
},
"end": {
"line": 5,
"column": 13
}
}
},
{
"type": "CommentBlock",
"value": " Four ",
"start": 53,
"end": 63,
"loc": {
"start": {
"line": 6,
"column": 2
},
"end": {
"line": 6,
"column": 12
}
}
}
]
}

View File

@ -1 +1 @@
fn(a, { b }, /* comment */);
fn(a, { b }, /* comment 1 */) /* comment 2 */;

View File

@ -1,7 +1,7 @@
{
"type": "File",
"start": 0,
"end": 28,
"end": 46,
"loc": {
"start": {
"line": 1,
@ -9,13 +9,13 @@
},
"end": {
"line": 1,
"column": 28
"column": 46
}
},
"program": {
"type": "Program",
"start": 0,
"end": 28,
"end": 46,
"loc": {
"start": {
"line": 1,
@ -23,7 +23,7 @@
},
"end": {
"line": 1,
"column": 28
"column": 46
}
},
"sourceType": "script",
@ -32,7 +32,7 @@
{
"type": "ExpressionStatement",
"start": 0,
"end": 28,
"end": 46,
"loc": {
"start": {
"line": 1,
@ -40,13 +40,13 @@
},
"end": {
"line": 1,
"column": 28
"column": 46
}
},
"expression": {
"type": "CallExpression",
"start": 0,
"end": 27,
"end": 29,
"loc": {
"start": {
"line": 1,
@ -54,7 +54,7 @@
},
"end": {
"line": 1,
"column": 27
"column": 29
}
},
"callee": {
@ -166,9 +166,9 @@
"trailingComments": [
{
"type": "CommentBlock",
"value": " comment ",
"value": " comment 1 ",
"start": 13,
"end": 26,
"end": 28,
"loc": {
"start": {
"line": 1,
@ -176,12 +176,30 @@
},
"end": {
"line": 1,
"column": 26
"column": 28
}
}
}
]
}
],
"trailingComments": [
{
"type": "CommentBlock",
"value": " comment 2 ",
"start": 30,
"end": 45,
"loc": {
"start": {
"line": 1,
"column": 30
},
"end": {
"line": 1,
"column": 45
}
}
}
]
}
}
@ -191,9 +209,9 @@
"comments": [
{
"type": "CommentBlock",
"value": " comment ",
"value": " comment 1 ",
"start": 13,
"end": 26,
"end": 28,
"loc": {
"start": {
"line": 1,
@ -201,7 +219,23 @@
},
"end": {
"line": 1,
"column": 26
"column": 28
}
}
},
{
"type": "CommentBlock",
"value": " comment 2 ",
"start": 30,
"end": 45,
"loc": {
"start": {
"line": 1,
"column": 30
},
"end": {
"line": 1,
"column": 45
}
}
}

View File

@ -1 +1 @@
fn(a, b, /* comment */);
fn(a, b, /* comment 1 */) /* comment 2*/;

View File

@ -1,7 +1,7 @@
{
"type": "File",
"start": 0,
"end": 24,
"end": 41,
"loc": {
"start": {
"line": 1,
@ -9,13 +9,13 @@
},
"end": {
"line": 1,
"column": 24
"column": 41
}
},
"program": {
"type": "Program",
"start": 0,
"end": 24,
"end": 41,
"loc": {
"start": {
"line": 1,
@ -23,7 +23,7 @@
},
"end": {
"line": 1,
"column": 24
"column": 41
}
},
"sourceType": "script",
@ -32,7 +32,7 @@
{
"type": "ExpressionStatement",
"start": 0,
"end": 24,
"end": 41,
"loc": {
"start": {
"line": 1,
@ -40,13 +40,13 @@
},
"end": {
"line": 1,
"column": 24
"column": 41
}
},
"expression": {
"type": "CallExpression",
"start": 0,
"end": 23,
"end": 25,
"loc": {
"start": {
"line": 1,
@ -54,7 +54,7 @@
},
"end": {
"line": 1,
"column": 23
"column": 25
}
},
"callee": {
@ -111,9 +111,9 @@
"trailingComments": [
{
"type": "CommentBlock",
"value": " comment ",
"value": " comment 1 ",
"start": 9,
"end": 22,
"end": 24,
"loc": {
"start": {
"line": 1,
@ -121,12 +121,30 @@
},
"end": {
"line": 1,
"column": 22
"column": 24
}
}
}
]
}
],
"trailingComments": [
{
"type": "CommentBlock",
"value": " comment 2",
"start": 26,
"end": 40,
"loc": {
"start": {
"line": 1,
"column": 26
},
"end": {
"line": 1,
"column": 40
}
}
}
]
}
}
@ -136,9 +154,9 @@
"comments": [
{
"type": "CommentBlock",
"value": " comment ",
"value": " comment 1 ",
"start": 9,
"end": 22,
"end": 24,
"loc": {
"start": {
"line": 1,
@ -146,7 +164,23 @@
},
"end": {
"line": 1,
"column": 22
"column": 24
}
}
},
{
"type": "CommentBlock",
"value": " comment 2",
"start": 26,
"end": 40,
"loc": {
"start": {
"line": 1,
"column": 26
},
"end": {
"line": 1,
"column": 40
}
}
}

View File

@ -0,0 +1,6 @@
const {
/* One */
x
/* Two */,
/* Three */
} /* Four */ = {};

View File

@ -0,0 +1,292 @@
{
"type": "File",
"start": 0,
"end": 69,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 6,
"column": 18
}
},
"program": {
"type": "Program",
"start": 0,
"end": 69,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 6,
"column": 18
}
},
"sourceType": "script",
"interpreter": null,
"body": [
{
"type": "VariableDeclaration",
"start": 0,
"end": 69,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 6,
"column": 18
}
},
"declarations": [
{
"type": "VariableDeclarator",
"start": 6,
"end": 68,
"loc": {
"start": {
"line": 1,
"column": 6
},
"end": {
"line": 6,
"column": 17
}
},
"id": {
"type": "ObjectPattern",
"start": 6,
"end": 52,
"loc": {
"start": {
"line": 1,
"column": 6
},
"end": {
"line": 6,
"column": 1
}
},
"properties": [
{
"type": "ObjectProperty",
"start": 22,
"end": 23,
"loc": {
"start": {
"line": 3,
"column": 2
},
"end": {
"line": 3,
"column": 3
}
},
"method": false,
"key": {
"type": "Identifier",
"start": 22,
"end": 23,
"loc": {
"start": {
"line": 3,
"column": 2
},
"end": {
"line": 3,
"column": 3
},
"identifierName": "x"
},
"name": "x"
},
"computed": false,
"shorthand": true,
"value": {
"type": "Identifier",
"start": 22,
"end": 23,
"loc": {
"start": {
"line": 3,
"column": 2
},
"end": {
"line": 3,
"column": 3
},
"identifierName": "x"
},
"name": "x"
},
"leadingComments": [
{
"type": "CommentBlock",
"value": " One ",
"start": 10,
"end": 19,
"loc": {
"start": {
"line": 2,
"column": 2
},
"end": {
"line": 2,
"column": 11
}
}
}
],
"trailingComments": [
{
"type": "CommentBlock",
"value": " Two ",
"start": 26,
"end": 35,
"loc": {
"start": {
"line": 4,
"column": 2
},
"end": {
"line": 4,
"column": 11
}
}
},
{
"type": "CommentBlock",
"value": " Three ",
"start": 39,
"end": 50,
"loc": {
"start": {
"line": 5,
"column": 2
},
"end": {
"line": 5,
"column": 13
}
}
}
],
"extra": {
"shorthand": true
}
}
],
"trailingComments": [
{
"type": "CommentBlock",
"value": " Four ",
"start": 53,
"end": 63,
"loc": {
"start": {
"line": 6,
"column": 2
},
"end": {
"line": 6,
"column": 12
}
}
}
]
},
"init": {
"type": "ObjectExpression",
"start": 66,
"end": 68,
"loc": {
"start": {
"line": 6,
"column": 15
},
"end": {
"line": 6,
"column": 17
}
},
"properties": []
}
}
],
"kind": "const"
}
],
"directives": []
},
"comments": [
{
"type": "CommentBlock",
"value": " One ",
"start": 10,
"end": 19,
"loc": {
"start": {
"line": 2,
"column": 2
},
"end": {
"line": 2,
"column": 11
}
}
},
{
"type": "CommentBlock",
"value": " Two ",
"start": 26,
"end": 35,
"loc": {
"start": {
"line": 4,
"column": 2
},
"end": {
"line": 4,
"column": 11
}
}
},
{
"type": "CommentBlock",
"value": " Three ",
"start": 39,
"end": 50,
"loc": {
"start": {
"line": 5,
"column": 2
},
"end": {
"line": 5,
"column": 13
}
}
},
{
"type": "CommentBlock",
"value": " Four ",
"start": 53,
"end": 63,
"loc": {
"start": {
"line": 6,
"column": 2
},
"end": {
"line": 6,
"column": 12
}
}
}
]
}

View File

@ -2,4 +2,4 @@ var obj = {
a: '1', // comment 1
b: '2', // comment 2
c: '3', // comment 3
};
}; // comment 4

View File

@ -1,7 +1,7 @@
{
"type": "File",
"start": 0,
"end": 83,
"end": 96,
"loc": {
"start": {
"line": 1,
@ -9,13 +9,13 @@
},
"end": {
"line": 5,
"column": 2
"column": 15
}
},
"program": {
"type": "Program",
"start": 0,
"end": 83,
"end": 96,
"loc": {
"start": {
"line": 1,
@ -23,7 +23,7 @@
},
"end": {
"line": 5,
"column": 2
"column": 15
}
},
"sourceType": "script",
@ -313,7 +313,25 @@
}
}
],
"kind": "var"
"kind": "var",
"trailingComments": [
{
"type": "CommentLine",
"value": " comment 4",
"start": 84,
"end": 96,
"loc": {
"start": {
"line": 5,
"column": 3
},
"end": {
"line": 5,
"column": 15
}
}
}
]
}
],
"directives": []
@ -366,6 +384,22 @@
"column": 22
}
}
},
{
"type": "CommentLine",
"value": " comment 4",
"start": 84,
"end": 96,
"loc": {
"start": {
"line": 5,
"column": 3
},
"end": {
"line": 5,
"column": 15
}
}
}
]
}

View File

@ -250,25 +250,7 @@
"label": null
}
],
"test": null,
"leadingComments": [
{
"type": "CommentLine",
"value": " comment",
"start": 47,
"end": 57,
"loc": {
"start": {
"line": 4,
"column": 4
},
"end": {
"line": 4,
"column": 14
}
}
}
]
"test": null
}
]
}

View File

@ -143,12 +143,48 @@
"raw": "42"
},
"value": 42
},
"trailingComments": [
{
"type": "CommentLine",
"value": " One",
"start": 17,
"end": 23,
"loc": {
"start": {
"line": 3,
"column": 2
},
"end": {
"line": 3,
"column": 8
}
}
}
]
}
]
}
},
"trailingComments": [
{
"type": "CommentLine",
"value": " Two",
"start": 27,
"end": 33,
"loc": {
"start": {
"line": 6,
"column": 0
},
"end": {
"line": 6,
"column": 6
}
}
}
]
},
{
"type": "ExpressionStatement",
"start": 34,
@ -179,26 +215,8 @@
"identifierName": "B"
},
"name": "B"
},
"leadingComments": [
{
"type": "CommentLine",
"value": " Two",
"start": 27,
"end": 33,
"loc": {
"start": {
"line": 6,
"column": 0
},
"end": {
"line": 6,
"column": 6
}
}
}
]
}
],
"directives": []
},

View File

@ -0,0 +1,5 @@
export {
/* One */ Foo
/* Two */,
/* Three */
} /* Four */ from "foo";

View File

@ -0,0 +1,256 @@
{
"type": "File",
"start": 0,
"end": 76,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 5,
"column": 24
}
},
"program": {
"type": "Program",
"start": 0,
"end": 76,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 5,
"column": 24
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