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Remove precedingCodepoint - use precedingJoinState instead

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repeatPrecedingCharacter (for REP sequence) changed to look at
the grapheme cluser to the "left" in the BufferLine, and repeat that.
This is an extension of the xterm behavior, and changes the
semantics of REP, so is not fully compatible.
However, the new behavior is cleaner and saner.

Moved precedingJoinState property to EscapeSequenceParser.
This commit is contained in:
Per Bothner
2023-08-24 07:58:06 -07:00
parent 5ccf4d3311
commit dc6dd6d2a8
4 changed files with 41 additions and 44 deletions
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src/common/parser/EscapeSequenceParser.ts
+9 -9
View File
@@ -230,7 +230,7 @@ export const VT500_TRANSITION_TABLE = (function (): TransitionTable {
export class EscapeSequenceParser extends Disposable implements IEscapeSequenceParser {
public initialState: number;
public currentState: number;
public precedingCodepoint: number;
public precedingJoinState: number; // UnicodeJoinProperties
// buffers over several parse calls
protected _params: Params;
@@ -271,7 +271,7 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
this._params = new Params(); // defaults to 32 storable params/subparams
this._params.addParam(0); // ZDM
this._collect = 0;
this.precedingCodepoint = 0;
this.precedingJoinState = 0;
// set default fallback handlers and handler lookup containers
this._printHandlerFb = (data, start, end): void => { };
@@ -448,7 +448,7 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
this._params.reset();
this._params.addParam(0); // ZDM
this._collect = 0;
this.precedingCodepoint = 0;
this.precedingJoinState = 0;
// abort pending continuation from async handler
// Here the RESET type indicates, that the next parse call will
// ignore any saved stack, instead continues sync with next codepoint from GROUND
@@ -610,7 +610,7 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
// cleanup before continuing with the main sync loop
this._parseStack.state = ParserStackType.NONE;
start = this._parseStack.chunkPos + 1;
this.precedingCodepoint = 0;
this.precedingJoinState = 0;
this.currentState = this._parseStack.transition & TableAccess.TRANSITION_STATE_MASK;
}
}
@@ -653,7 +653,7 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
case ParserAction.EXECUTE:
if (this._executeHandlers[code]) this._executeHandlers[code]();
else this._executeHandlerFb(code);
this.precedingCodepoint = 0;
this.precedingJoinState = 0;
break;
case ParserAction.IGNORE:
break;
@@ -688,7 +688,7 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
if (j < 0) {
this._csiHandlerFb(this._collect << 8 | code, this._params);
}
this.precedingCodepoint = 0;
this.precedingJoinState = 0;
break;
case ParserAction.PARAM:
// inner loop: digits (0x30 - 0x39) and ; (0x3b) and : (0x3a)
@@ -727,7 +727,7 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
if (jj < 0) {
this._escHandlerFb(this._collect << 8 | code);
}
this.precedingCodepoint = 0;
this.precedingJoinState = 0;
break;
case ParserAction.CLEAR:
this._params.reset();
@@ -758,7 +758,7 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
this._params.reset();
this._params.addParam(0); // ZDM
this._collect = 0;
this.precedingCodepoint = 0;
this.precedingJoinState = 0;
break;
case ParserAction.OSC_START:
this._oscParser.start();
@@ -783,7 +783,7 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
this._params.reset();
this._params.addParam(0); // ZDM
this._collect = 0;
this.precedingCodepoint = 0;
this.precedingJoinState = 0;
break;
}
this.currentState = transition & TableAccess.TRANSITION_STATE_MASK;
src/common/parser/Types.d.ts
Vendored
+5 -4
View File
@@ -146,11 +146,12 @@ export type PrintFallbackHandlerType = PrintHandlerType;
*/
export interface IEscapeSequenceParser extends IDisposable {
/**
* Preceding codepoint to get REP working correctly.
* This must be set by the print handler as last action.
* It gets reset by the parser for any valid sequence beside REP itself.
* Preceding grapheme-join-state.
* Used for joining graphame clusters across calls to `print`.
* Also used by REP to check if repeat a character is allowed.
* It gets reset by the parser for any valid sequence besides text.
*/
precedingCodepoint: number;
precedingJoinState: number; // More specifically: UnicodeJoinProperties
/**
* Reset the parser to its initial state (handlers are kept).