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Typing performance improvement #7193

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ingorichter merged 4 commits into from
Mar 18, 2014
Merged

Typing performance improvement #7193

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8960b69
don't retrieve tabSize pref until it's needed
redmunds Mar 13, 2014
3803e25
safer way to check if tabSize pref has been retrieved
redmunds Mar 14, 2014
17612b7
protect against modulo zero, and negative tab size
redmunds Mar 14, 2014
f41c78a
Merge remote-tracking branch 'origin/master' into randy/perf-status-bar
redmunds Mar 18, 2014
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5 changes: 4 additions & 1 deletion src/editor/Editor.js
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Original file line number Diff line number Diff line change
Expand Up @@ -878,12 +878,15 @@ define(function (require, exports, module) {
*/
Editor.prototype.getColOffset = function (pos) {
var line = this._codeMirror.getRange({line: pos.line, ch: 0}, pos),
tabSize = Editor.getTabSize(),
tabSize = null,
column = 0,
i;

for (i = 0; i < line.length; i++) {
if (line[i] === '\t') {
if (tabSize === null) {
tabSize = Editor.getTabSize();
}
column += (tabSize - (column % tabSize));
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@TomMalbran TomMalbran Mar 14, 2014

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We don't let the tab size be 0, but if we just return 0 when it is 0, then this code won't break if we ever let it be 0. We know that the column will always be zero if the tabsize is 0.

Does CM, lets you use 0, for tabsize? If so, maybe we can fix other issues like this and make the min be 0.

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@redmunds redmunds Mar 14, 2014

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I fixed the code so that if anyone did set tabSize to 0, then we wouldn't retrieve pref on every Tab char.

I can't think of any reason why you'd want tabSize to be 0. Someone recently did something similar (#7020) but it was a hack that should have been done differently. Until I hear of a valid reason for doing it, then I think the minimum tabSize should be 1.

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@TomMalbran TomMalbran Mar 14, 2014

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It would be just for consistency. After the validation code is merged, we could assume that the tab size will be always be a value between 1 and 10. But here you assume that it can be 0, but if it is 0, then (column % tabSize) = NaN, and the code will return NaN, which isn't what you expect. Maybe we can just add if (tabSize = 0) { return 0; }?

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@redmunds redmunds Mar 14, 2014

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Good catch. I didn't notice that. Fixed.

} else {
column++;
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