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convert-comments.ts
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convert-comments.ts
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import * as ts from 'typescript';
import { forEachComment } from 'tsutils/util/util';
import { getLocFor } from './node-utils';
import { AST_TOKEN_TYPES, TSESTree } from './ts-estree';
/**
* Convert all comments for the given AST.
* @param ast the AST object
* @param code the TypeScript code
* @returns the converted ESTreeComment
* @private
*/
export function convertComments(
ast: ts.SourceFile,
code: string,
): TSESTree.Comment[] {
const comments: TSESTree.Comment[] = [];
forEachComment(
ast,
(_, comment) => {
const type =
comment.kind == ts.SyntaxKind.SingleLineCommentTrivia
? AST_TOKEN_TYPES.Line
: AST_TOKEN_TYPES.Block;
const range: TSESTree.Range = [comment.pos, comment.end];
const loc = getLocFor(range[0], range[1], ast);
// both comments start with 2 characters - /* or //
const textStart = range[0] + 2;
const textEnd =
comment.kind === ts.SyntaxKind.SingleLineCommentTrivia
? // single line comments end at the end
range[1] - textStart
: // multiline comments end 2 characters early
range[1] - textStart - 2;
comments.push({
type,
value: code.substr(textStart, textEnd),
range,
loc,
});
},
ast,
);
return comments;
}