func (p *parser) pexpr(x Expr, keep_parens bool) Expr {
	if trace {
		defer p.trace("pexpr")()
	}

	if x == nil {
		x = p.operand(keep_parens)
	}

loop:
	for {
		pos := p.pos()
		switch p.tok {
		case _Dot:
			p.next()
			switch p.tok {
			case _Name:
				// pexpr '.' sym
				t := new(SelectorExpr)
				t.pos = pos

func (check *Checker) binary(x *operand, e ast.Expr, lhs, rhs ast.Expr, op token.Token, opPos token.Pos) {
	var y operand

	check.expr(nil, x, lhs)
	check.expr(nil, &y, rhs)

	if x.mode == invalid {
		return
	}
	if y.mode == invalid {
		x.mode = invalid
		x.expr = y.expr
		return
	}

	if isShift(op) {
		check.shift(x, &y, e, op)
		return
	}

//	}
	ADDD	F1, F2, F3

//	LTYPEL cond freg ',' freg
//	{
//		outcode($1, $2, &$3, int32($5.Reg), &nullgen);
//	}
	CMPD	F1, F2

//
// MCR MRC
//
//	LTYPEJ cond con ',' expr ',' spreg ',' creg ',' creg oexpr
//	{
//		var g obj.Addr
//
//		g = nullgen;
//		g.Type = obj.TYPE_CONST;
//		g.Offset = int64(
//			(0xe << 24) |		/* opcode */
//			($1 << 20) |		/* MCR/MRC */

func (check *Checker) binary(x *operand, e syntax.Expr, lhs, rhs syntax.Expr, op syntax.Operator) {
	var y operand

	check.expr(nil, x, lhs)
	check.expr(nil, &y, rhs)

	if x.mode == invalid {
		return
	}
	if y.mode == invalid {
		x.mode = invalid
		x.expr = y.expr
		return
	}

	if isShift(op) {
		check.shift(x, &y, e, op)
		return
	}

      "targets": [
        {
          "datasource": {
            "type": "prometheus",
            "uid": "${DS_PROMETHEUS}"
          },
          "exemplar": true,
          "expr": "time() - max(minio_node_process_starttime_seconds{job=~\"$scrape_jobs\"})",
          "format": "time_series",
          "instant": true,
          "interval": "",
          "intervalFactor": 1,

	}
	p.expr1(x.Y, prec+1, depth+1)
	if ws == ignore {
		p.print(unindent)
	}
}

func isBinary(expr ast.Expr) bool {
	_, ok := expr.(*ast.BinaryExpr)
	return ok
}

func (p *printer) expr1(expr ast.Expr, prec1, depth int) {
	p.setPos(expr.Pos())

	switch x := expr.(type) {
	case *ast.BadExpr:
		p.print("BadExpr")

	case *ast.Ident:
		p.print(x)

	case *ast.BinaryExpr:

}

func (p *parser) parseSelector(x ast.Expr) ast.Expr {
	if p.trace {
		defer un(trace(p, "Selector"))
	}

	sel := p.parseIdent()

	return &ast.SelectorExpr{x, sel}
}

func (p *parser) parseTypeAssertion(x ast.Expr) ast.Expr {
	if p.trace {
		defer un(trace(p, "TypeAssertion"))
	}

	p.expect(token.LPAREN)
	var typ ast.Expr
	if p.tok == token.TYPE {

func (p *parser) parseSelector(x ast.Expr) ast.Expr {
	if p.trace {
		defer un(trace(p, "Selector"))
	}

	sel := p.parseIdent()

	return &ast.SelectorExpr{X: x, Sel: sel}
}

func (p *parser) parseTypeAssertion(x ast.Expr) ast.Expr {
	if p.trace {
		defer un(trace(p, "TypeAssertion"))
	}

	lparen := p.expect(token.LPAREN)
	var typ ast.Expr
	if p.tok == token.TYPE {

			}
		case "var":
			expr = &ast.StarExpr{Star: (*r.Expr).Pos(), X: expr}
		case "macro":
			expr = &ast.CallExpr{Fun: expr}
		}
	case ctxSelector:
		if r.Name.Kind == "var" {
			expr = &ast.StarExpr{Star: (*r.Expr).Pos(), X: expr}
		} else {
			error_(r.Pos(), "only C variables allowed in selector expression %s", fixGo(r.Name.Go))
		}
	case ctxType:

import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.ListExpression;
import org.codehaus.groovy.ast.expr.MapEntryExpression;
import org.codehaus.groovy.ast.expr.MapExpression;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.ast.expr.PropertyExpression;
import org.codehaus.groovy.ast.expr.SpreadMapExpression;
import org.codehaus.groovy.ast.expr.VariableExpression;