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Optimize parsing of OSC_STRING to minimize string concatenation.

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This commit is contained in:
Per Bothner
2018-12-09 13:29:09 -08:00
parent b5f1c3384a
commit 1c4a71f0df
1 changed files with 15 additions and 6 deletions
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src/EscapeSequenceParser.ts
+15 -6
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@@ -391,7 +391,11 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
}
// normal transition & action lookup
transition = (code < 0xa0) ? (table[currentState << 8 | code]) : DEFAULT_TRANSITION;
transition = (code < 0xa0
? (table[currentState << 8 | code])
: currentState === ParserState.OSC_STRING
? (ParserAction.OSC_PUT << 4) | ParserState.OSC_STRING
: DEFAULT_TRANSITION);
switch (transition >> 4) {
case ParserAction.PRINT:
print = (~print) ? print : i;
@@ -423,10 +427,6 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
case ParserState.GROUND:
print = (~print) ? print : i;
break;
case ParserState.OSC_STRING:
osc += String.fromCharCode(code);
transition |= ParserState.OSC_STRING;
break;
case ParserState.CSI_IGNORE:
transition |= ParserState.CSI_IGNORE;
break;
@@ -517,7 +517,16 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
osc = '';
break;
case ParserAction.OSC_PUT:
osc += data.charAt(i);
for (let j = i + 1; ; j++) {
if (j >= l
|| ((code = data.charCodeAt(j)) <= 0x9f
&& (table[ParserState.OSC_STRING << 8 | code] >> 4
!== ParserAction.OSC_PUT))) {
osc += data.substring(i, j);
i = j - 1;
break;
}
}
break;
case ParserAction.OSC_END:
if (osc && code !== 0x18 && code !== 0x1a) {