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during file update request only changed portion of the text from the host

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This commit is contained in:
Vladimir Matveev 2015-05-15 14:28:02 -07:00
parent 28c9ff1d84
commit 2c4801ea47
1 changed files with 28 additions and 1 deletions
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29
src/services/services.ts
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@ -1829,7 +1829,34 @@ module ts {
if (version !== sourceFile.version) {
// Once incremental parsing is ready, then just call into this function.
if (!disableIncrementalParsing) {
let newSourceFile = updateSourceFile(sourceFile, scriptSnapshot.getText(0, scriptSnapshot.getLength()), textChangeRange, aggressiveChecks);
let newText: string;
// grab the fragment from the beginning of the original text to the beginning of the span
let prefix = textChangeRange.span.start !== 0
? sourceFile.text.substr(0, textChangeRange.span.start)
: "";
// grab the fragment from the end of the span till the end of the original text
let suffix = textChangeRange.span.start + textChangeRange.span.length !== sourceFile.text.length
? sourceFile.text.substr(textChangeRange.span.start + textChangeRange.span.length)
: "";
if (textChangeRange.newLength === 0) {
// edit was a deletion - just combine prefix and suffix
newText = prefix && suffix ? prefix + suffix : prefix || suffix;
}
else {
// it was actual edit, fetch the fragment of new text that correspond to new span
let changedText = scriptSnapshot.getText(textChangeRange.span.start, textChangeRange.span.start + textChangeRange.newLength);
// combine prefix, changed text and suffix
newText = prefix && suffix
? prefix + changedText + suffix
: prefix
? (prefix + changedText)
: (changedText + suffix);
}
let newSourceFile = updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks);
setSourceFileFields(newSourceFile, scriptSnapshot, version);
// after incremental parsing nameTable might not be up-to-date
// drop it so it can be lazily recreated later