Method parse

www/js/_hyperscript.js:6563–6577

(parser)

      this.args = { targetValue: target, amount: amountExpr, ...target.lhs };
    }
    static parse(parser) {
      if (!parser.matchToken("decrement")) return;
      var amountExpr;
      try {
        parser.pushFollow("by");
        var target = parser.parseElement("assignableExpression");
      } finally {
        parser.popFollow();
      }
      while (target.type === "parenthesized") target = target.expr;
      if (parser.matchToken("by")) {
        amountExpr = parser.requireElement("expression");
      }
      return new _DecrementCommand(target, amountExpr);
    }
    resolve(context, args) {
      var { targetValue, amount, ...lhs } = args;
      targetValue = targetValue ? parseFloat(targetValue) : 0;