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Fix bad line number assertion in ScriptInfo.positionToLineOffset

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This is the line number side of ecddf8468f (from #21924, fixing #21818).
But the code is slightly improved for both cases: instead of testing
that `leaf` is defined, check whether `lineCount` is zero, and if it is,
return `〈1,0〉` for the one-based line and zero-based column numbers.
(The requirement of `lineCount > 0` is also seen in the fact
that `lineNumberToInfo` expects a "*One*BasedLine" argument.)

I've stared at this code way too much, since I think that there is
something more fundamentally wrong here.  E.g., `EditWalker` only
`push`es to `startPath` but never pops even a `children`-less node that
is left after deleting the whole contents.  But I can't figure out the
overall structure, which is also why the test that I added is not
great (see the comment there; also, #21924 is dealing with the same
problem and didn't add a test).

Fixes #44518.
This commit is contained in:
Eli Barzilay
2021-06-25 13:45:43 -04:00
parent 5cea46c537
commit f47ddbc3b0
2 changed files with 20 additions and 6 deletions
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14
src/server/scriptVersionCache.ts
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@@ -67,10 +67,8 @@ namespace ts.server {
}
const lm = LineIndex.linesFromText(insertedText);
const lines = lm.lines;
if (lines.length > 1) {
if (lines[lines.length - 1] === "") {
lines.pop();
}
if (lines.length > 1 && lines[lines.length - 1] === "") {
lines.pop();
}
let branchParent: LineNode | undefined;
let lastZeroCount: LineCollection | undefined;
@@ -683,8 +681,12 @@ namespace ts.server {
}
// Skipped all children
const { leaf } = this.lineNumberToInfo(this.lineCount(), 0);
return { oneBasedLine: this.lineCount(), zeroBasedColumn: leaf ? leaf.charCount() : 0, lineText: undefined };
const lineCount = this.lineCount();
if (lineCount === 0) { // it's empty! (and lineNumberToInfo expects a one-based line)
return { oneBasedLine: 1, zeroBasedColumn: 0, lineText: undefined };
}
const leaf = Debug.checkDefined(this.lineNumberToInfo(lineCount, 0).leaf);
return { oneBasedLine: lineCount, zeroBasedColumn: leaf.charCount(), lineText: undefined };
}
/**