80 lines
1.6 KiB
TypeScript
80 lines
1.6 KiB
TypeScript
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export class LexerEvent
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{
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static readonly LENGTH_ERROR_ID = -1;
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static readonly LENGTH_DONE_ID = -2;
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private _type:string;
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get type(){ return this._type; }
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private _offset:number;
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get offset(){ return this._offset; }
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private _length:number;
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get length(){ return this._length; }
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private _match:string = null;
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get match(){ return this._match;}
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get exclusiveEnd()
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{
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return this.offset + this.length;
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}
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get lastSourceIndex()
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{
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return this.exclusiveEnd - 1;
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}
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extendLength( num:number )
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{
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this._length += num;
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}
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constructor( type:string, offset:number, length:number )
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{
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this.set( type, offset, length );
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}
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set( type:string, offset:number, length:number )
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{
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this._type = type;
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this._offset = offset;
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this._length = length;
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}
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isType( type:string )
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{
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return this._type == type;
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}
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get isError(){ return this._length === LexerEvent.LENGTH_ERROR_ID; }
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get isDone(){ return this._length === LexerEvent.LENGTH_DONE_ID; }
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get isDoneOrError(){ return this.isDone || this.isError }
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get end() { return this._offset + this._length; }
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toString()
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{
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return "Token{ '" + this._type + "' (" + this._offset + "-" + this.end + ") }";
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}
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clone()
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{
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return new LexerEvent( this._type, this._offset, this._length );
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}
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getMatch( source:string )
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{
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if ( this._match )
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{
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return this._match;
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}
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this.setMatch( source.substring( this._offset, this.end ) );
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return this._match;
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}
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setMatch( source:string )
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{
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this._match = source;
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}
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}
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