VSCode Extenstion how to get Position of last character of line

问题

I am developing a VSCode plugin, and now want to get the position of the last character of a line. Now I want to get it through a known Position object, using "with" method.

The official reference is here: https://code.visualstudio.com/api/references/vscode-api#Position

You see "with" method has 2 overloads. Now I want to use the "with(change: {line: number, character:number})" method:

 const endPos = startPos.with({ line: 1, character: -1 });

startPos is a "Position" object.

But this code is wrong. It seems I misunderstood this method. It just sets the position with the given value, rather than adding the "difference" on it. So how to get the Position of the last character of one line, derived from a given Position? 🙂

回答1:

Get the line of the startPos and use it's length to get the last char

let curLineText = editor.document.lineAt(startPos);
let lastCharPos = new vscode.Position(curLinePos.line, Math.max(curLineText.text.length-1, 0));

Remove the -1 if you want a position after the last character

来源：https://stackoverflow.com/questions/57099341/vscode-extenstion-how-to-get-position-of-last-character-of-line