Class BufferSource

src/v6/inputSource/BufferSource.js:5–116

  tab: 9
}
export default class BufferSource{
  constructor(bytesArr){
    this.line = 1;
    this.cols = 0;
    this.buffer = bytesArr;
    this.startIndex = 0;
  }



  readCh() {
    return String.fromCharCode(this.buffer[this.startIndex++]);
  }

  readChAt(index) {
    return String.fromCharCode(this.buffer[this.startIndex+index]);
  }

  readStr(n,from){
    if(typeof from === "undefined") from = this.startIndex;
    return this.buffer.slice(from, from + n).toString();
  }

  readUpto(stopStr) {
    const inputLength = this.buffer.length;
    const stopLength = stopStr.length;
    const stopBuffer = Buffer.from(stopStr);

    for (let i = this.startIndex; i < inputLength; i++) {
        let match = true;
        for (let j = 0; j < stopLength; j++) {
            if (this.buffer[i + j] !== stopBuffer[j]) {
                match = false;
                break;
            }
        }

        if (match) {
            const result = this.buffer.slice(this.startIndex, i).toString();
            this.startIndex = i + stopLength;
            return result;
        }
    }

    throw new Error(`Unexpected end of source. Reading '${stopStr}'`);
}

readUptoCloseTag(stopStr) { //stopStr: "</tagname"
    const inputLength = this.buffer.length;
    const stopLength = stopStr.length;
    const stopBuffer = Buffer.from(stopStr);
    let stopIndex = 0;
    //0: non-matching, 1: matching stop string, 2: matching closing
    let match = 0;

    for (let i = this.startIndex; i < inputLength; i++) {
        if(match === 1){//initial part matched
            if(stopIndex === 0) stopIndex = i;