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345 lines (311 loc) · 13.9 KB
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/* @internal */
namespace ts.JsDoc {
const singleLineTemplate = { newText: "/** */", caretOffset: 3 };
const jsDocTagNames = [
"augments",
"author",
"argument",
"borrows",
"class",
"constant",
"constructor",
"constructs",
"default",
"deprecated",
"description",
"event",
"example",
"extends",
"field",
"fileOverview",
"function",
"ignore",
"inheritDoc",
"inner",
"lends",
"link",
"memberOf",
"method",
"name",
"namespace",
"param",
"private",
"prop",
"property",
"public",
"requires",
"returns",
"see",
"since",
"static",
"throws",
"type",
"typedef",
"version"
];
let jsDocTagNameCompletionEntries: CompletionEntry[];
let jsDocTagCompletionEntries: CompletionEntry[];
export function getJsDocCommentsFromDeclarations(declarations?: Declaration[]) {
// Only collect doc comments from duplicate declarations once:
// In case of a union property there might be same declaration multiple times
// which only varies in type parameter
// Eg. const a: Array<string> | Array<number>; a.length
// The property length will have two declarations of property length coming
// from Array<T> - Array<string> and Array<number>
const documentationComment = <SymbolDisplayPart[]>[];
forEachUnique(declarations, declaration => {
forEach(getAllJSDocs(declaration), doc => {
if (doc.comment) {
if (documentationComment.length) {
documentationComment.push(lineBreakPart());
}
documentationComment.push(textPart(doc.comment));
}
});
});
return documentationComment;
}
export function getJsDocTagsFromDeclarations(declarations?: Declaration[]): JSDocTagInfo[] {
// Only collect doc comments from duplicate declarations once.
const tags: JSDocTagInfo[] = [];
forEachUnique(declarations, declaration => {
for (const tag of getJSDocTags(declaration)) {
tags.push({ name: tag.tagName.text, text: getCommentText(tag) });
}
});
return tags;
}
function getCommentText(tag: JSDocTag): string {
const { comment } = tag;
switch (tag.kind) {
case SyntaxKind.JSDocAugmentsTag:
return withNode((tag as JSDocAugmentsTag).class);
case SyntaxKind.JSDocTemplateTag:
return withList((tag as JSDocTemplateTag).typeParameters);
case SyntaxKind.JSDocTypeTag:
return withNode((tag as JSDocTypeTag).typeExpression);
case SyntaxKind.JSDocTypedefTag:
case SyntaxKind.JSDocPropertyTag:
case SyntaxKind.JSDocParameterTag:
const { name } = tag as JSDocTypedefTag | JSDocPropertyTag | JSDocParameterTag;
return name ? withNode(name) : comment;
default:
return comment;
}
function withNode(node: Node) {
return `${node.getText()} ${comment}`;
}
function withList(list: NodeArray<Node>): string {
return `${list.map(x => x.getText())} ${comment}`;
}
}
/**
* Iterates through 'array' by index and performs the callback on each element of array until the callback
* returns a truthy value, then returns that value.
* If no such value is found, the callback is applied to each element of array and undefined is returned.
*/
function forEachUnique<T, U>(array: T[], callback: (element: T, index: number) => U): U {
if (array) {
for (let i = 0; i < array.length; i++) {
if (indexOf(array, array[i]) === i) {
const result = callback(array[i], i);
if (result) {
return result;
}
}
}
}
return undefined;
}
export function getJSDocTagNameCompletions(): CompletionEntry[] {
return jsDocTagNameCompletionEntries || (jsDocTagNameCompletionEntries = ts.map(jsDocTagNames, tagName => {
return {
name: tagName,
kind: ScriptElementKind.keyword,
kindModifiers: "",
sortText: "0",
};
}));
}
export const getJSDocTagNameCompletionDetails = getJSDocTagCompletionDetails;
export function getJSDocTagCompletions(): CompletionEntry[] {
return jsDocTagCompletionEntries || (jsDocTagCompletionEntries = ts.map(jsDocTagNames, tagName => {
return {
name: `@${tagName}`,
kind: ScriptElementKind.keyword,
kindModifiers: "",
sortText: "0"
};
}));
}
export function getJSDocTagCompletionDetails(name: string): CompletionEntryDetails {
return {
name,
kind: ScriptElementKind.unknown, // TODO: should have its own kind?
kindModifiers: "",
displayParts: [textPart(name)],
documentation: emptyArray,
tags: emptyArray,
codeActions: undefined,
};
}
export function getJSDocParameterNameCompletions(tag: JSDocParameterTag): CompletionEntry[] {
if (!isIdentifier(tag.name)) {
return emptyArray;
}
const nameThusFar = tag.name.text;
const jsdoc = tag.parent;
const fn = jsdoc.parent;
if (!ts.isFunctionLike(fn)) return [];
return mapDefined(fn.parameters, param => {
if (!isIdentifier(param.name)) return undefined;
const name = param.name.text;
if (jsdoc.tags.some(t => t !== tag && isJSDocParameterTag(t) && isIdentifier(t.name) && t.name.escapedText === name)
|| nameThusFar !== undefined && !startsWith(name, nameThusFar)) {
return undefined;
}
return { name, kind: ScriptElementKind.parameterElement, kindModifiers: "", sortText: "0" };
});
}
export function getJSDocParameterNameCompletionDetails(name: string): CompletionEntryDetails {
return {
name,
kind: ScriptElementKind.parameterElement,
kindModifiers: "",
displayParts: [textPart(name)],
documentation: emptyArray,
tags: emptyArray,
codeActions: undefined,
};
}
/**
* Checks if position points to a valid position to add JSDoc comments, and if so,
* returns the appropriate template. Otherwise returns an empty string.
* Invalid positions are
* - within comments, strings (including template literals and regex), and JSXText
* - within a token
*
* Hosts should ideally check that:
* - The line is all whitespace up to 'position' before performing the insertion.
* - If the keystroke sequence "/\*\*" induced the call, we also check that the next
* non-whitespace character is '*', which (approximately) indicates whether we added
* the second '*' to complete an existing (JSDoc) comment.
* @param fileName The file in which to perform the check.
* @param position The (character-indexed) position in the file where the check should
* be performed.
*/
export function getDocCommentTemplateAtPosition(newLine: string, sourceFile: SourceFile, position: number): TextInsertion | undefined {
// Check if in a context where we don't want to perform any insertion
if (isInString(sourceFile, position) || isInComment(sourceFile, position) || hasDocComment(sourceFile, position)) {
return undefined;
}
const tokenAtPos = getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false);
const tokenStart = tokenAtPos.getStart();
if (!tokenAtPos || tokenStart < position) {
return undefined;
}
const commentOwnerInfo = getCommentOwnerInfo(tokenAtPos);
if (!commentOwnerInfo) {
// if climbing the tree did not find a declaration with parameters, complete to a single line comment
return singleLineTemplate;
}
const { commentOwner, parameters } = commentOwnerInfo;
if (commentOwner.kind === SyntaxKind.JsxText) {
return undefined;
}
if (commentOwner.getStart() < position || parameters.length === 0) {
// if climbing the tree found a declaration with parameters but the request was made inside it
// or if there are no parameters, complete to a single line comment
return singleLineTemplate;
}
const posLineAndChar = sourceFile.getLineAndCharacterOfPosition(position);
const lineStart = sourceFile.getLineStarts()[posLineAndChar.line];
// replace non-whitespace characters in prefix with spaces.
const indentationStr = sourceFile.text.substr(lineStart, posLineAndChar.character).replace(/\S/i, () => " ");
const isJavaScriptFile = hasJavaScriptFileExtension(sourceFile.fileName);
const docParams = parameters.map(({name}, i) => {
const nameText = isIdentifier(name) ? name.text : `param${i}`;
const type = isJavaScriptFile ? "{any} " : "";
return `${indentationStr} * @param ${type}${nameText}${newLine}`;
}).join("");
// A doc comment consists of the following
// * The opening comment line
// * the first line (without a param) for the object's untagged info (this is also where the caret ends up)
// * the '@param'-tagged lines
// * TODO: other tags.
// * the closing comment line
// * if the caret was directly in front of the object, then we add an extra line and indentation.
const preamble = "/**" + newLine +
indentationStr + " * ";
const result =
preamble + newLine +
docParams +
indentationStr + " */" +
(tokenStart === position ? newLine + indentationStr : "");
return { newText: result, caretOffset: preamble.length };
}
interface CommentOwnerInfo {
readonly commentOwner: Node;
readonly parameters: ReadonlyArray<ParameterDeclaration>;
}
function getCommentOwnerInfo(tokenAtPos: Node): CommentOwnerInfo | undefined {
for (let commentOwner = tokenAtPos; commentOwner; commentOwner = commentOwner.parent) {
switch (commentOwner.kind) {
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.Constructor:
case SyntaxKind.MethodSignature:
const { parameters } = commentOwner as FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | MethodSignature;
return { commentOwner, parameters };
case SyntaxKind.VariableStatement: {
const varStatement = <VariableStatement>commentOwner;
const varDeclarations = varStatement.declarationList.declarations;
const parameters = varDeclarations.length === 1 && varDeclarations[0].initializer
? getParametersFromRightHandSideOfAssignment(varDeclarations[0].initializer)
: undefined;
return parameters ? { commentOwner, parameters } : undefined;
}
case SyntaxKind.SourceFile:
return undefined;
case SyntaxKind.BinaryExpression: {
const be = commentOwner as BinaryExpression;
if (getSpecialPropertyAssignmentKind(be) === ts.SpecialPropertyAssignmentKind.None) {
return undefined;
}
const parameters = isFunctionLike(be.right) ? be.right.parameters : emptyArray;
return { commentOwner, parameters };
}
case SyntaxKind.JsxText: {
const parameters: ReadonlyArray<ParameterDeclaration> = emptyArray;
return { commentOwner, parameters };
}
}
}
}
/**
* Digs into an an initializer or RHS operand of an assignment operation
* to get the parameters of an apt signature corresponding to a
* function expression or a class expression.
*
* @param rightHandSide the expression which may contain an appropriate set of parameters
* @returns the parameters of a signature found on the RHS if one exists; otherwise 'emptyArray'.
*/
function getParametersFromRightHandSideOfAssignment(rightHandSide: Expression): ReadonlyArray<ParameterDeclaration> {
while (rightHandSide.kind === SyntaxKind.ParenthesizedExpression) {
rightHandSide = (<ParenthesizedExpression>rightHandSide).expression;
}
switch (rightHandSide.kind) {
case SyntaxKind.FunctionExpression:
case SyntaxKind.ArrowFunction:
return (<FunctionExpression>rightHandSide).parameters;
case SyntaxKind.ClassExpression:
for (const member of (<ClassExpression>rightHandSide).members) {
if (member.kind === SyntaxKind.Constructor) {
return (<ConstructorDeclaration>member).parameters;
}
}
break;
}
return emptyArray;
}
}