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Merge pull request #1822 from PerBothner/optimize-osc-parse

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Optimize parsing of OSC_STRING to minimize string concatenation.
This commit is contained in:
Daniel Imms
2018-12-11 11:09:27 -08:00
committed by GitHub
parent 53f3b4e368 bbbfc04fa5
commit a758f8c82f
1 changed files with 15 additions and 9 deletions
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src/EscapeSequenceParser.ts
+15 -9
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@@ -67,7 +67,8 @@ const PRINTABLES = r(0x20, 0x7f);
const EXECUTABLES = r(0x00, 0x18);
EXECUTABLES.push(0x19);
EXECUTABLES.push.apply(EXECUTABLES, r(0x1c, 0x20));
const DEFAULT_TRANSITION = ParserAction.ERROR << 4 | ParserState.GROUND;
// Pseudo-character placeholder for printable non-ascii characters.
const NON_ASCII_PRINTABLE = 0xA0;
/**
* VT500 compatible transition table.
@@ -79,10 +80,10 @@ export const VT500_TRANSITION_TABLE = (function (): TransitionTable {
const states: number[] = r(ParserState.GROUND, ParserState.DCS_PASSTHROUGH + 1);
let state: any;
// table with default transition [any] --> DEFAULT_TRANSITION
// table with default transition
for (state in states) {
// NOTE: table lookup is capped at 0xa0 in parse to keep the table small
for (let code = 0; code < 160; ++code) {
for (let code = 0; code <= NON_ASCII_PRINTABLE; ++code) {
table.add(code, state, ParserAction.ERROR, ParserState.GROUND);
}
}
@@ -184,6 +185,7 @@ export const VT500_TRANSITION_TABLE = (function (): TransitionTable {
table.addMany(PRINTABLES, ParserState.DCS_PASSTHROUGH, ParserAction.DCS_PUT, ParserState.DCS_PASSTHROUGH);
table.add(0x7f, ParserState.DCS_PASSTHROUGH, ParserAction.IGNORE, ParserState.DCS_PASSTHROUGH);
table.addMany([0x1b, 0x9c], ParserState.DCS_PASSTHROUGH, ParserAction.DCS_UNHOOK, ParserState.GROUND);
table.add(NON_ASCII_PRINTABLE, ParserState.OSC_STRING, ParserAction.OSC_PUT, ParserState.OSC_STRING);
return table;
})();
@@ -391,7 +393,7 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
}
// normal transition & action lookup
transition = (code < 0xa0) ? (table[currentState << 8 | code]) : DEFAULT_TRANSITION;
transition = table[currentState << 8 | (code < 0xa0 ? code : NON_ASCII_PRINTABLE)];
switch (transition >> 4) {
case ParserAction.PRINT:
print = (~print) ? print : i;
@@ -423,10 +425,6 @@ 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 +515,15 @@ 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)) < 0x20
|| (code > 0x7f && code <= 0x9f)) {
osc += data.substring(i, j);
i = j - 1;
break;
}
}
break;
case ParserAction.OSC_END:
if (osc && code !== 0x18 && code !== 0x1a) {