Method set

static/katex/katex.mjs:12990–13019

* Set the current value of a name, and optionally set it globally too. * Local set() sets the current value and (when appropriate) adds an undo * operation to the undo stack. Global set() may change the undo * operation at every level, so takes time linear in their number.

(name, value, global)

  set(name, value, global) {
    if (global === void 0) {
      global = false;
    }

    if (global) {
      // Global set is equivalent to setting in all groups.  Simulate this
      // by destroying any undos currently scheduled for this name,
      // and adding an undo with the *new* value (in case it later gets
      // locally reset within this environment).
      for (let i = 0; i < this.undefStack.length; i++) {
        delete this.undefStack[i][name];
      }

      if (this.undefStack.length > 0) {
        this.undefStack[this.undefStack.length - 1][name] = value;
      }
    } else {
      // Undo this set at end of this group (possibly to `undefined`),
      // unless an undo is already in place, in which case that older
      // value is the correct one.
      const top = this.undefStack[this.undefStack.length - 1];

      if (top && !top.hasOwnProperty(name)) {
        top[name] = this.current[name];
      }
    }

    this.current[name] = value;
  }

}