@uiw/react-textarea-code-editor/esm/SelectionText.js

A simple code editor with syntax highlighting.

export class SelectionText {
  constructor(elm) {
    this.elm = void 0;
    this.start = void 0;
    this.end = void 0;
    this.value = void 0;
    var {
      selectionStart,
      selectionEnd
    } = elm;
    this.elm = elm;
    this.start = selectionStart;
    this.end = selectionEnd;
    this.value = this.elm.value;
  }
  position(start, end) {
    var {
      selectionStart,
      selectionEnd
    } = this.elm;
    this.start = typeof start === 'number' && !isNaN(start) ? start : selectionStart;
    this.end = typeof end === 'number' && !isNaN(end) ? end : selectionEnd;
    this.elm.selectionStart = this.start;
    this.elm.selectionEnd = this.end;
    return this;
  }
  insertText(text) {
    // Most of the used APIs only work with the field selected
    this.elm.focus();
    this.elm.setRangeText(text);
    this.value = this.elm.value;
    this.position();
    return this;
  }
  getSelectedValue(start, end) {
    var {
      selectionStart,
      selectionEnd
    } = this.elm;
    return this.value.slice(typeof start === 'number' && !isNaN(start) ? start : selectionStart, typeof end === 'number' && !isNaN(end) ? start : selectionEnd);
  }
  getLineStartNumber() {
    var start = this.start;
    while (start > 0) {
      start--;
      if (this.value.charAt(start) === '\n') {
        start++;
        break;
      }
    }
    return start;
  }
  /** Indent on new lines */
  getIndentText() {
    var start = this.getLineStartNumber();
    var str = this.getSelectedValue(start);
    var indent = '';
    str.replace(/(^(\s)+)/, (str, old) => indent = old);
    return indent;
  }
  lineStarInstert(text) {
    if (text) {
      var oldStart = this.start;
      var start = this.getLineStartNumber();
      var str = this.getSelectedValue(start);
      this.position(start, this.end).insertText(str.split('\n').map(txt => text + txt).join('\n')).position(oldStart + text.length, this.end);
    }
    return this;
  }
  lineStarRemove(text) {
    if (text) {
      var oldStart = this.start;
      var start = this.getLineStartNumber();
      var str = this.getSelectedValue(start);
      var reg = new RegExp("^" + text, 'g');
      var newStart = oldStart - text.length;
      if (!reg.test(str)) {
        newStart = oldStart;
      }
      this.position(start, this.end).insertText(str.split('\n').map(txt => txt.replace(reg, '')).join('\n')).position(newStart, this.end);
    }
  }
  /** Notify any possible listeners of the change */
  notifyChange() {
    var event = new Event('input', {
      bubbles: true,
      cancelable: false
    });
    this.elm.dispatchEvent(event);
  }
}