diff --git a/parser.go b/parser.go
index 209ed08..55339f0 100644
--- a/parser.go
+++ b/parser.go
@@ -1696,22 +1696,7 @@ func (be *BinaryOpExpr) appendStringNoKeepMetricNames(dst []byte) []byte {
 		dst = be.Left.AppendString(dst)
 	}
 	dst = append(dst, ' ')
-	dst = append(dst, be.Op...)
-	if be.Bool {
-		dst = append(dst, "bool"...)
-	}
-	if be.GroupModifier.Op != "" {
-		dst = append(dst, ' ')
-		dst = be.GroupModifier.AppendString(dst)
-	}
-	if be.JoinModifier.Op != "" {
-		dst = append(dst, ' ')
-		dst = be.JoinModifier.AppendString(dst)
-		if prefix := be.JoinModifierPrefix; prefix != nil {
-			dst = append(dst, " prefix "...)
-			dst = prefix.AppendString(dst)
-		}
-	}
+	dst = be.appendModifiers(dst)
 	dst = append(dst, ' ')
 	if be.needRightParens() {
 		dst = appendArgInParens(dst, be.Right)
@@ -1737,12 +1722,32 @@ func (be *BinaryOpExpr) needRightParens() bool {
 		if isReservedBinaryOpIdent(t.Name) {
 			return true
 		}
-		return be.KeepMetricNames
+		return t.KeepMetricNames || be.KeepMetricNames
 	default:
 		return false
 	}
 }
 
+func (be *BinaryOpExpr) appendModifiers(dst []byte) []byte {
+	dst = append(dst, be.Op...)
+	if be.Bool {
+		dst = append(dst, "bool"...)
+	}
+	if be.GroupModifier.Op != "" {
+		dst = append(dst, ' ')
+		dst = be.GroupModifier.AppendString(dst)
+	}
+	if be.JoinModifier.Op != "" {
+		dst = append(dst, ' ')
+		dst = be.JoinModifier.AppendString(dst)
+		if prefix := be.JoinModifierPrefix; prefix != nil {
+			dst = append(dst, " prefix "...)
+			dst = prefix.AppendString(dst)
+		}
+	}
+	return dst
+}
+
 func needBinaryOpArgParens(arg Expr) bool {
 	switch t := arg.(type) {
 	case *BinaryOpExpr:
@@ -1827,6 +1832,10 @@ type FuncExpr struct {
 func (fe *FuncExpr) AppendString(dst []byte) []byte {
 	dst = appendEscapedIdent(dst, fe.Name)
 	dst = appendStringArgListExpr(dst, fe.Args)
+	return fe.appendModifiers(dst)
+}
+
+func (fe *FuncExpr) appendModifiers(dst []byte) []byte {
 	if fe.KeepMetricNames {
 		dst = append(dst, " keep_metric_names"...)
 	}
@@ -1855,6 +1864,10 @@ type AggrFuncExpr struct {
 func (ae *AggrFuncExpr) AppendString(dst []byte) []byte {
 	dst = appendEscapedIdent(dst, ae.Name)
 	dst = appendStringArgListExpr(dst, ae.Args)
+	return ae.appendModifiers(dst)
+}
+
+func (ae *AggrFuncExpr) appendModifiers(dst []byte) []byte {
 	if ae.Modifier.Op != "" {
 		dst = append(dst, ' ')
 		dst = ae.Modifier.AppendString(dst)
@@ -1954,18 +1967,7 @@ func (re *RollupExpr) ForSubquery() bool {
 
 // AppendString appends string representation of re to dst and returns the result.
 func (re *RollupExpr) AppendString(dst []byte) []byte {
-	needParens := func() bool {
-		if _, ok := re.Expr.(*RollupExpr); ok {
-			return true
-		}
-		if _, ok := re.Expr.(*BinaryOpExpr); ok {
-			return true
-		}
-		if ae, ok := re.Expr.(*AggrFuncExpr); ok && ae.Modifier.Op != "" {
-			return true
-		}
-		return false
-	}()
+	needParens := re.needParens()
 	if needParens {
 		dst = append(dst, '(')
 	}
@@ -1973,6 +1975,10 @@ func (re *RollupExpr) AppendString(dst []byte) []byte {
 	if needParens {
 		dst = append(dst, ')')
 	}
+	return re.appendModifiers(dst)
+}
+
+func (re *RollupExpr) appendModifiers(dst []byte) []byte {
 	if re.Window != nil || re.InheritStep || re.Step != nil {
 		dst = append(dst, '[')
 		dst = re.Window.AppendString(dst)
@@ -2002,6 +2008,17 @@ func (re *RollupExpr) AppendString(dst []byte) []byte {
 	return dst
 }
 
+func (re *RollupExpr) needParens() bool {
+	switch t := re.Expr.(type) {
+	case *RollupExpr, *BinaryOpExpr:
+		return true
+	case *AggrFuncExpr:
+		return t.Modifier.Op != ""
+	default:
+		return false
+	}
+}
+
 // LabelFilter represents MetricsQL label filter like `foo="bar"`.
 type LabelFilter struct {
 	// Label contains label name for the filter.
diff --git a/parser_test.go b/parser_test.go
index 9d0e01b..4194cea 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -317,6 +317,7 @@ func TestParseSuccess(t *testing.T) {
 	another(`(a + on(x) group_left(y) b keep_metric_names) offset 5m @ 1235`, `((a + on(x) group_left(y) b) keep_metric_names) offset 5m @ 1235`)
 	another(`(a + on (x) group_left (y) b keep_metric_names) @ 1235 offset 5m`, `((a + on(x) group_left(y) b) keep_metric_names) offset 5m @ 1235`)
 	another(`rate(x) keep_metric_names + (abs(y) keep_metric_names) keep_metric_names`, `(rate(x) keep_metric_names + (abs(y) keep_metric_names)) keep_metric_names`)
+	same(`a + (rate(b) keep_metric_names)`)
 
 	// binaryOp with reserved names
 	same(`a + (on)`)
diff --git a/prettier.go b/prettier.go
deleted file mode 100644
index e425610..0000000
--- a/prettier.go
+++ /dev/null
@@ -1,167 +0,0 @@
-package metricsql
-
-import (
-	"fmt"
-	"strings"
-)
-
-const indentString = "  "
-
-func pad(indent int, s string) string {
-	p := strings.Repeat(indentString, indent)
-	return p + s
-}
-
-func shouldWrap(expr Expr) bool {
-	switch expr.(type) {
-	case *MetricExpr, *NumberExpr, *StringExpr, *FuncExpr:
-		return false
-	default:
-		return true
-	}
-}
-
-func wrapWithBraces(expr Expr, b *strings.Builder, indent, maxLineLength int) {
-	if shouldWrap(expr) {
-		b.WriteString(pad(indent, "(\n"))
-		b.WriteString(prettify(expr, indent+1, maxLineLength))
-		b.WriteString("\n" + pad(indent, ")"))
-	} else {
-		b.WriteString(prettify(expr, indent, maxLineLength))
-	}
-}
-
-func prettify(expr Expr, indent, maxLineLength int) string {
-	var str strings.Builder
-	var b []byte
-	b = expr.AppendString(b)
-	if len(b) <= maxLineLength {
-		str.WriteString(pad(indent, ""))
-		str.Write(b)
-		return str.String()
-	}
-	switch e := expr.(type) {
-	case *BinaryOpExpr:
-		var binaryOpStr strings.Builder
-
-		wrapWithBraces(e.Left, &binaryOpStr, indent+1, maxLineLength)
-		buildBinaryOp(&binaryOpStr, e, indent)
-		wrapWithBraces(e.Right, &binaryOpStr, indent+1, maxLineLength)
-
-		str.WriteString(binaryOpStr.String())
-	case *RollupExpr:
-		var rollupStr strings.Builder
-
-		wrapWithBraces(e.Expr, &rollupStr, indent, maxLineLength)
-		buildRollupFunc(&rollupStr, e)
-
-		str.WriteString(rollupStr.String())
-	case *AggrFuncExpr:
-		var aggrFuncStr strings.Builder
-
-		buildAggrFuncString(&aggrFuncStr, e, indent, maxLineLength)
-
-		str.WriteString(aggrFuncStr.String())
-	case *MetricExpr, *NumberExpr, *StringExpr:
-		var b []byte
-		str.WriteString(pad(indent, ""))
-		str.Write(e.AppendString(b))
-	case *FuncExpr:
-		if hasNoArgs(e) {
-			str.WriteString(pad(indent, e.Name))
-		} else {
-			buildFuncExpr(&str, e, indent, maxLineLength)
-		}
-	default:
-		e.AppendString(b)
-		str.WriteString(pad(indent, ""))
-		str.Write(b)
-	}
-	return str.String()
-}
-
-func buildRollupFunc(rollupStr *strings.Builder, e *RollupExpr) {
-	if e.Window != nil || e.InheritStep || e.Step != nil {
-		rollupStr.WriteString("[")
-		if e.Window != nil {
-			var b []byte
-			b = e.Window.AppendString(b)
-			rollupStr.Write(b)
-		}
-		if e.Step != nil {
-			rollupStr.WriteString(":")
-			rollupStr.WriteString(e.Step.s)
-		} else if e.InheritStep {
-			rollupStr.WriteString(":")
-		}
-		rollupStr.WriteString("]")
-	}
-	if e.Offset != nil {
-		rollupStr.WriteString(fmt.Sprintf(" offset %s", e.Offset.s))
-	}
-	if e.At != nil {
-		var b []byte
-		rollupStr.WriteString(fmt.Sprintf(" @ (%s)", e.At.AppendString(b)))
-	}
-}
-
-func buildBinaryOp(binaryOpStr *strings.Builder, e *BinaryOpExpr, indent int) {
-	binaryOpStr.WriteString(fmt.Sprintf("\n%s%s", pad(indent, ""), e.Op))
-	if e.Bool {
-		binaryOpStr.WriteString(" bool")
-	}
-	if e.GroupModifier.Op != "" {
-		binaryOpStr.WriteString(" ")
-		binaryOpStr.Write(e.GroupModifier.AppendString(nil))
-	}
-	if e.JoinModifier.Op != "" {
-		binaryOpStr.WriteString(" ")
-		binaryOpStr.Write(e.JoinModifier.AppendString(nil))
-	}
-	binaryOpStr.WriteString("\n")
-}
-
-func buildAggrFuncString(aggrFuncStr *strings.Builder, e *AggrFuncExpr, indent, maxLineLength int) {
-	aggrFuncStr.WriteString(pad(indent, e.Name))
-	if e.Modifier.Op != "" {
-		aggrFuncStr.WriteString(" ")
-		aggrFuncStr.Write(e.Modifier.AppendString(nil))
-	}
-	aggrFuncStr.WriteString(" (\n")
-	for i, a := range e.Args {
-		aggrFuncStr.WriteString(prettify(a, indent+1, maxLineLength))
-		if i < len(e.Args)-1 {
-			aggrFuncStr.WriteString(",")
-		}
-		aggrFuncStr.WriteString("\n")
-	}
-	aggrFuncStr.WriteString(pad(indent, ")"))
-}
-
-func hasNoArgs(e *FuncExpr) bool {
-	return len(e.Args) == 0
-}
-
-func buildFuncExpr(funcStr *strings.Builder, e *FuncExpr, indent, maxLineLength int) {
-	var funcExprStr strings.Builder
-	funcExprStr.WriteString(pad(indent, e.Name) + " (\n")
-	for i, a := range e.Args {
-		funcExprStr.WriteString(prettify(a, indent+1, maxLineLength))
-		if i < len(e.Args)-1 {
-			funcExprStr.WriteString(",")
-		}
-		funcExprStr.WriteString("\n")
-	}
-	funcExprStr.WriteString(pad(indent, ")"))
-
-	funcStr.WriteString(funcExprStr.String())
-}
-
-func Prettify(s string, maxLineLength int) (string, error) {
-	expr, err := Parse(s)
-	if err != nil {
-		return "", err
-	}
-
-	return prettify(expr, 0, maxLineLength), nil
-}
diff --git a/prettier_test.go b/prettier_test.go
deleted file mode 100644
index 1f51d53..0000000
--- a/prettier_test.go
+++ /dev/null
@@ -1,1451 +0,0 @@
-package metricsql
-
-import "testing"
-
-func TestPrettier(t *testing.T) {
-	another := func(s, expected string) {
-		t.Helper()
-
-		const maxLineLength = 130
-		got, err := Prettify(s, maxLineLength)
-		if err != nil {
-			t.Fatalf("unexpected error when parsing %q: %s", s, err)
-		}
-
-		if expected != got {
-			t.Fatalf("string not prettified;\ngot:%s\nwant\n%q", got, expected)
-		}
-	}
-	same := func(s string) {
-		t.Helper()
-		another(s, s)
-	}
-
-	same(`{}`)
-	same(`{}[5m]`)
-	same(`{}[5m:]`)
-	same(`{}[5M:]`)
-	same(`{}[:]`)
-	another(`{}[: ]`, `{}[:]`)
-	same(`{}[:3s]`)
-	another(`{}[: 3s ]`, `{}[:3s]`)
-	same(`{}[5m:3s]`)
-	another(`{}[ 5m : 3s ]`, `{}[5m:3s]`)
-	same(`{} offset 5m`)
-	same(`{} offset -5m`)
-	same(`{} offset 5M`)
-	same(`{}[5m] offset 10y`)
-	same(`{}[5.3m:3.4s] offset 10y`)
-	same(`{}[:3.4s] offset 10y`)
-	same(`{}[:3.4s] offset -10y`)
-	same(`{Foo="bAR"}`)
-	same(`{foo="bar"}`)
-	same(`{foo="bar"}[5m]`)
-	same(`{foo="bar"}[5m:]`)
-	same(`{foo="bar"}[5m:3s]`)
-	same(`{foo="bar"} offset 13.4ms`)
-	same(`{foo="bar"}[5w4h-3.4m13.4ms]`)
-	same(`{foo="bar"} offset 10y`)
-	same(`{foo="bar"} offset -10y`)
-	same(`{foo="bar"}[5m] offset 10y`)
-	same(`{foo="bar"}[5m:3s] offset 10y`)
-	another(`{foo="bar"}[5m] oFFSEt 10y`, `{foo="bar"}[5m] offset 10y`)
-	same("METRIC")
-	same("metric")
-	same("m_e:tri44:_c123")
-	another("-metric", "0 - metric")
-	same(`metric offset 10h`)
-	same("metric[5m]")
-	same("metric[5m:3s]")
-	same("metric[5m] offset 10h")
-	same("metric[5m:3s] offset 10h")
-	same("metric[5i:3i] offset 10i")
-	same(`metric{foo="bar"}`)
-	same(`metric{foo="bar"} offset 10h`)
-	same(`metric{foo!="bar"}[2d]`)
-	same(`metric{foo="bar"}[2d] offset 10h`)
-	same(`metric{foo="bar", b="sdfsdf"}[2d:3h] offset 10h`)
-	same(`metric{foo="bar", b="sdfsdf"}[2d:3h] offset 10`)
-	same(`metric{foo="bar", b="sdfsdf"}[2d:3] offset 10h`)
-	same(`metric{foo="bar", b="sdfsdf"}[2:3h] offset 10h`)
-	same(`metric{foo="bar", b="sdfsdf"}[2.34:5.6] offset 3600.5`)
-	same(`metric{foo="bar", b="sdfsdf"}[234:56] offset -3600`)
-	another(`  metric  {  foo  = "bar"  }  [  2d ]   offset   10h  `, `metric{foo="bar"}[2d] offset 10h`)
-	// @ modifier
-	// See https://prometheus.io/docs/prometheus/latest/querying/basics/#modifier
-	same(`foo @ 123.45`)
-	same(`foo\@ @ 123.45`)
-	same(`{foo=~"bar"} @ end()`)
-	same(`foo{bar="baz"} @ start()`)
-	same(`foo{bar="baz"}[5m] @ 12345`)
-	same(`foo{bar="baz"}[5m:4s] offset 5m @ (end() - 3.5m)`)
-	another(`foo{bar="baz"}[5m:4s] @ (end() - 3.5m) offset 2.4h`, `foo{bar="baz"}[5m:4s] offset 2.4h @ (end() - 3.5m)`)
-	another(`foo @ start() + (bar offset 3m @ end()) / baz OFFSET -5m`, `foo @ start() + (bar offset 3m @ end() / baz offset -5m)`)
-	same(`sum(foo) @ start() + rate(bar @ (end() - 5m))`)
-	another(`time() @ (start())`, `time() @ start()`)
-	another(`time() @ (start()+(1+1))`, `time() @ (start() + 2)`)
-	same(`time() @ (end() - 10m)`)
-	// metric name matching keywords
-	same("rate")
-	same("RATE")
-	same("by")
-	same("BY")
-	same("bool")
-	same("BOOL")
-	same("unless")
-	same("UNLESS")
-	same("Ignoring")
-	same("with")
-	same("WITH")
-	same("With")
-	same("offset")
-	same("keep_metric_names")
-	same("alias")
-	same(`alias{foo="bar"}`)
-	same(`aLIas{alias="aa"}`)
-	another(`al\ias`, `alias`)
-	// identifiers with with escape chars
-	same(`foo\ bar`)
-	same(`foo\-bar\{{baz\+bar="aa"}`)
-	another(`\x2E\x2ef\oo{b\xEF\ar="aa"}`, `\..foo{bïar="aa"}`)
-	same(`温度{房间="水电费"}[5m] offset 10m`)
-	another(`\温\度{\房\间="水电费"}[5m] offset 10m`, `温度{房间="水电费"}[5m] offset 10m`)
-	same(`sum(fo\|o) by (b\|a, x)`)
-	another(`sum(x) by (b\x7Ca)`, `sum(x) by (b\|a)`)
-	// Duplicate filters
-	same(`foo{__name__="bar"}`)
-	same(`foo{a="b", a="c", __name__="aaa", b="d"}`)
-	// Metric filters ending with comma
-	another(`m{foo="bar",}`, `m{foo="bar"}`)
-	// String concat in tag value
-	another(`m{foo="bar" + "baz"}`, `m{foo="barbaz"}`)
-
-	// Valid regexp
-	same(`foo{bar=~"x"}`)
-	same(`foo{bar=~"^x"}`)
-	same(`foo{bar=~"^x$"}`)
-	same(`foo{bar=~"^(a[bc]|d)$"}`)
-	same(`foo{bar!~"x"}`)
-	same(`foo{bar!~"^x"}`)
-	same(`foo{bar!~"^x$"}`)
-	same(`foo{bar!~"^(a[bc]|d)$"}`)
-
-	// stringExpr
-	same(`""`)
-	same(`"\n\t\r 12:{}[]()44"`)
-	another(`''`, `""`)
-	another("``", `""`)
-	another("   `foo\"b'ar`  ", "\"foo\\\"b'ar\"")
-	another(`  'foo\'bar"BAZ'  `, `"foo'bar\"BAZ"`)
-	// string concat
-	another(`"foo"+'bar'`, `"foobar"`)
-
-	// numberExpr
-	same(`1`)
-	same(`123.`)
-	another(`-123.`, `-123`)
-	same(`foo - 123.`)
-	same(`12.e+4`)
-	same(`12Ki`)
-	same(`1.23Gb`)
-	same(`foo - 23M`)
-	another(`-1.23Gb`, `-1.23e+09`)
-	same(`1.23`)
-	same(`0.23`)
-	same(`1.2e+45`)
-	same(`1.2e-45`)
-	same(`-1`)
-	same(`-1.23`)
-	same(`-0.23`)
-	same(`-1.2e+45`)
-	same(`-1.2e-45`)
-	same(`-1.2e-45`)
-	same(`12.5E34`)
-	another(`-.2`, `-0.2`)
-	another(`-.2E-2`, `-0.002`)
-	same(`NaN`)
-	same(`nan`)
-	same(`NAN`)
-	same(`nAN`)
-	same(`Inf`)
-	same(`INF`)
-	same(`inf`)
-	another(`+Inf`, `Inf`)
-	same(`-Inf`)
-	another(`-inF`, `-Inf`)
-	same(`0x12`)
-	same(`0x3b`)
-	another(`-0x3b`, `-59`)
-	another(`+0X3B`, `0X3B`)
-	same(`0b1011`)
-	same(`073`)
-	another(`-0o12`, `-10`)
-
-	// durationExpr
-	same(`1h`)
-	another(`-1h`, `0 - 1h`)
-	same(`0.34h4m5s`)
-	same(`0.34H4m5S`)
-	another(`-0.34h4m5s`, `0 - 0.34h4m5s`)
-	same(`sum_over_tme(m[1h]) / 1h`)
-	same(`sum_over_time(m[3600]) / 3600`)
-
-	// binaryOpExpr
-	another(`nan == nan`, `NaN`)
-	another(`nan ==bool nan`, `1`)
-	another(`nan !=bool nan`, `0`)
-	another(`nan !=bool 2`, `1`)
-	another(`2 !=bool nan`, `1`)
-	another(`nan >bool nan`, `0`)
-	another(`nan <bool nan`, `0`)
-	another(`1 ==bool nan`, `0`)
-	another(`NaN !=bool 1`, `1`)
-	another(`inf >=bool 2`, `1`)
-	another(`-1 >bool -inf`, `1`)
-	another(`-1 <bool -inf`, `0`)
-	another(`nan + 2 *3 * inf`, `NaN`)
-	another(`INF - Inf`, `NaN`)
-	another(`Inf + inf`, `+Inf`)
-	another(`1/0`, `+Inf`)
-	another(`0/0`, `NaN`)
-	another(`-m`, `0 - m`)
-	same(`m + ignoring () n[5m]`)
-	another(`M + IGNORING () N[5m]`, `M + ignoring () N[5m]`)
-	same(`m + on (foo) n[5m]`)
-	another(`m + ON (Foo) n[5m]`, `m + on (Foo) n[5m]`)
-	same(`m + ignoring (a, b) n[5m]`)
-	another(`1 or 2`, `1`)
-	another(`1 and 2`, `1`)
-	another(`1 unless 2`, `NaN`)
-	another(`1 default 2`, `1`)
-	another(`1 default NaN`, `1`)
-	another(`NaN default 2`, `2`)
-	another(`1 > 2`, `NaN`)
-	another(`1 > bool 2`, `0`)
-	another(`3 >= 2`, `3`)
-	another(`3 <= bool 2`, `0`)
-	another(`1 + -2 - 3`, `-4`)
-	another(`1 / 0 + 2`, `+Inf`)
-	another(`2 + -1 / 0`, `-Inf`)
-	another(`(-1) ^ 0.5`, `NaN`)
-	another(`-1 ^ 0.5`, `-1`)
-	another(`512.5 - (1 + 3) * (2 ^ 2) ^ 3`, `256.5`)
-	another(`1 == bool 1 != bool 24 < bool 4 > bool -1`, `1`)
-	another(`1 == bOOl 1 != BOOL 24 < Bool 4 > booL -1`, `1`)
-	another(`m1+on(foo)group_left m2`, `m1 + on (foo) group_left () m2`)
-	another(`M1+ON(FOO)GROUP_left M2`, `M1 + on (FOO) group_left () M2`)
-	same(`m1 + on (foo) group_right () m2`)
-	same(`m1 + on (foo, bar) group_right (x, y) m2`)
-	another(`m1 + on (foo, bar,) group_right (x, y,) m2`, `m1 + on (foo, bar) group_right (x, y) m2`)
-	same(`m1 == bool on (foo, bar) group_right (x, y) m2`)
-	another(`5 - 1 + 3 * 2 ^ 2 ^ 3 - 2  OR Metric {Bar= "Baz", aaa!="bb",cc=~"dd" ,zz !~"ff" } `,
-		`770 or Metric{Bar="Baz", aaa!="bb", cc=~"dd", zz!~"ff"}`)
-	same(`"foo" + bar()`)
-	same(`"foo" + bar{x="y"}`)
-	same(`("foo"[3s] + bar{x="y"})[5m:3s] offset 10s`)
-	same(`("foo"[3s] + bar{x="y"})[5i:3i] offset 10i`)
-	same(`bar + "foo" offset 3s`)
-	same(`bar + "foo" offset 3i`)
-	another(`1+2 if 2>3`, `NaN`)
-	another(`1+4 if 2<3`, `5`)
-	another(`2+6 default 3 if 2>3`, `8`)
-	another(`2+6 if 2>3 default NaN`, `NaN`)
-	another(`42 if 3>2 if 2+2<5`, `42`)
-	another(`42 if 3>2 if 2+2>=5`, `NaN`)
-	another(`1+2 ifnot 2>3`, `3`)
-	another(`1+4 ifnot 2<3`, `NaN`)
-	another(`2+6 default 3 ifnot 2>3`, `8`)
-	another(`2+6 ifnot 2>3 default NaN`, `8`)
-	another(`42 if 3>2 ifnot 2+2<5`, `NaN`)
-	another(`42 if 3>2 ifnot 2+2>=5`, `42`)
-	another(`"foo" + "bar"`, `"foobar"`)
-	another(`"foo"=="bar"`, `NaN`)
-	another(`"foo"=="foo"`, `1`)
-	another(`"foo"!="bar"`, `1`)
-	another(`"foo"+"bar"+"baz"`, `"foobarbaz"`)
-	another(`"a">"b"`, `NaN`)
-	another(`"a">bool"b"`, `0`)
-	another(`"a"<"b"`, `1`)
-	another(`"a">="b"`, `NaN`)
-	another(`"a">=bool"b"`, `0`)
-	another(`"a"<="b"`, `1`)
-	same(`"a" - "b"`)
-
-	// parensExpr
-	another(`(-foo + ((bar) / (baz))) + ((23))`, `((0 - foo) + (bar / baz)) + 23`)
-	another(`(FOO + ((Bar) / (baZ))) + ((23))`, `(FOO + (Bar / baZ)) + 23`)
-	same(`(foo, bar)`)
-	another(`((foo, bar),(baz))`, `((foo, bar), baz)`)
-	same(`(foo, (bar, baz), ((x, y), (z, y), xx))`)
-	another(`1+(foo, bar,)`, `1 + (foo, bar)`)
-	another(`((foo(bar,baz)), (1+(2)+(3,4)+()))`, `(foo(bar, baz), (3 + (3, 4)) + ())`)
-	same(`()`)
-
-	// funcExpr
-	same(`f()`)
-	another(`f(x,)`, `f(x)`)
-	another(`-f()-Ff()`, `(0 - f()) - Ff()`)
-	same(`F()`)
-	another(`+F()`, `F()`)
-	another(`++F()`, `F()`)
-	another(`--F()`, `0 - (0 - F())`)
-	same(`f(http_server_request)`)
-	same(`f(http_server_request)[4s:5m] offset 10m`)
-	same(`f(http_server_request)[4i:5i] offset 10i`)
-	same(`F(HttpServerRequest)`)
-	same(`f(job, foo)`)
-	same(`F(Job, Foo)`)
-	another(` FOO (bar) + f  (  m  (  ),ff(1 + (  2.5)) ,M[5m ]  , "ff"  )`, `FOO(bar) + f(m(), ff(3.5), M[5m], "ff")`)
-	same(`rate(foo[5m]) keep_metric_names`)
-	another(`log2(foo) KEEP_metric_names + 1 / increase(bar[5m]) keep_metric_names offset 1h @ 435`,
-		`log2(foo) keep_metric_names + (1 / increase(bar[5m]) keep_metric_names offset 1h @ 435)`)
-	// funcName matching keywords
-	same(`by(2)`)
-	same(`BY(2)`)
-	same(`or(2)`)
-	same(`OR(2)`)
-	same(`bool(2)`)
-	same(`BOOL(2)`)
-	same(`rate(rate(m))`)
-	same(`rate(rate(m[5m]))`)
-	same(`rate(rate(m[5m])[1h:])`)
-	same(`rate(rate(m[5m])[1h:3s])`)
-	// funcName with escape chars
-	same(`foo\(ba\-r()`)
-
-	// aggrFuncExpr
-	same(`sum(http_server_request) by ()`)
-	same(`sum(http_server_request) by (job)`)
-	same(`sum(http_server_request) without (job, foo)`)
-	another(`sum(x,y,) without (a,b,)`, `sum(x, y) without (a, b)`)
-	another(`sum by () (xx)`, `sum(xx) by ()`)
-	another(`sum by (s) (xx)[5s]`, `(sum(xx) by (s))[5s]`)
-	another(`SUM BY (ZZ, aa) (XX)`, `sum(XX) by (ZZ, aa)`)
-	another(`sum without (a, b) (xx,2+2)`, `sum(xx, 4) without (a, b)`)
-	another(`Sum WIthout (a, B) (XX,2+2)`, `sum(XX, 4) without (a, B)`)
-	same(`sum(a) or sum(b)`)
-	same(`sum(a) by () or sum(b) without (x, y)`)
-	same(`sum(a) + sum(b)`)
-	same(`sum(x) * (1 + sum(a))`)
-	same(`avg(x) limit 10`)
-	same(`avg(x) without (z, b) limit 1`)
-	another(`avg by(x) (z) limit 20`, `avg(z) by (x) limit 20`)
-
-	// All the above
-	another(`Sum(Ff(M) * M{X=""}[5m] Offset 7m - 123, 35) BY (X, y) * F2("Test")`,
-		`sum((Ff(M) * M{X=""}[5m] offset 7m) - 123, 35) by (X, y) * F2("Test")`)
-	another(`# comment
-		Sum(Ff(M) * M{X=""}[5m] Offset 7m - 123, 35) BY (X, y) # yet another comment
-		* F2("Test")`,
-		`sum((Ff(M) * M{X=""}[5m] offset 7m) - 123, 35) by (X, y) * F2("Test")`)
-
-	// withExpr
-	another(`with () x`, `x`)
-	another(`with (x=1,) x`, `1`)
-	another(`with (x = m offset 5h) x + x`, `m offset 5h + m offset 5h`)
-	another(`with (x = m offset 5i) x + x`, `m offset 5i + m offset 5i`)
-	another(`with (foo = bar{x="x"}) 1`, `1`)
-	another(`with (foo = bar{x="x"}) "x"`, `"x"`)
-	another(`with (f="x") f`, `"x"`)
-	another(`with (foo = bar{x="x"}) x{x="y"}`, `x{x="y"}`)
-	another(`with (foo = bar{x="x"}) 1+1`, `2`)
-	another(`with (foo = bar{x="x"}) f()`, `f()`)
-	another(`with (foo = bar{x="x"}) sum(x)`, `sum(x)`)
-	another(`with (foo = bar{x="x"}) baz{foo="bar"}`, `baz{foo="bar"}`)
-	another(`with (foo = bar) baz`, `baz`)
-	another(`with (foo = bar) foo + foo{a="b"}`, `bar + bar{a="b"}`)
-	another(`with (foo = bar, bar=baz + f()) test`, `test`)
-	another(`with (ct={job="test"}) a{ct} + ct() + f({ct="x"})`, `(a{job="test"} + {job="test"}) + f({ct="x"})`)
-	another(`with (ct={job="test", i="bar"}) ct + {ct, x="d"} + foo{ct, ct} + ctx(1)`,
-		`(({job="test", i="bar"} + {job="test", i="bar", x="d"}) + foo{job="test", i="bar"}) + ctx(1)`)
-	another(`with (foo = bar) {__name__=~"foo"}`, `{__name__=~"foo"}`)
-	another(`with (foo = bar) foo{__name__="foo"}`, `bar`)
-	another(`with (foo = bar) {__name__="foo", x="y"}`, `bar{x="y"}`)
-	another(`with (foo(bar) = {__name__!="bar"}) foo(x)`, `{__name__!="bar"}`)
-	another(`with (foo(bar) = bar{__name__="bar"}) foo(x)`, `x`)
-	another(`with (foo\-bar(baz) = baz + baz) foo\-bar((x,y))`, `(x, y) + (x, y)`)
-	another(`with (foo\-bar(baz) = baz + baz) foo\-bar(x*y)`, `(x * y) + (x * y)`)
-	another(`with (foo\-bar(baz) = baz + baz) foo\-bar(x\*y)`, `x\*y + x\*y`)
-	another(`with (foo\-bar(b\ az) = b\ az + b\ az) foo\-bar(x\*y)`, `x\*y + x\*y`)
-	// override ttf to something new.
-	another(`with (ttf = a) ttf + b`, `a + b`)
-	// override ttf to ru
-	another(`with (ttf = ru(m, n)) ttf`, `(clamp_min(n - clamp_min(m, 0), 0) / clamp_min(n, 0)) * 100`)
-
-	// Verify withExpr recursion and forward reference
-	another(`with (x = x+y, y = x+x) y ^ 2`, `((x + y) + (x + y)) ^ 2`)
-	another(`with (f1(x)=f2(x), f2(x)=f1(x)^2) f1(foobar)`, `f2(foobar)`)
-	another(`with (f1(x)=f2(x), f2(x)=f1(x)^2) f2(foobar)`, `f2(foobar) ^ 2`)
-
-	// Verify withExpr funcs
-	another(`with (x() = y+1) x`, `y + 1`)
-	another(`with (x(foo) = foo+1) x(a)`, `a + 1`)
-	another(`with (x(a, b) = a + b) x(foo, bar)`, `foo + bar`)
-	another(`with (x(a, b) = a + b) x(foo, x(1, 2))`, `foo + 3`)
-	another(`with (x(a) = sum(a) by (b)) x(xx) / x(y)`, `sum(xx) by (b) / sum(y) by (b)`)
-	another(`with (f(a,f,x)=ff(x,f,a)) f(f(x,y,z),1,2)`, `ff(2, 1, ff(z, y, x))`)
-	another(`with (f(x)=1+f(x)) f(foo{bar="baz"})`, `1 + f(foo{bar="baz"})`)
-	another(`with (a=foo, y=bar, f(a)= a+a+y) f(x)`, `(x + x) + bar`)
-	another(`with (f(a, b) = m{a, b}) f({a="x", b="y"}, {c="d"})`, `m{a="x", b="y", c="d"}`)
-	another(`with (xx={a="x"}, f(a, b) = m{a, b}) f({xx, b="y"}, {c="d"})`, `m{a="x", b="y", c="d"}`)
-	another(`with (x() = {b="c"}) foo{x}`, `foo{b="c"}`)
-	another(`with (f(x)=x{foo="bar"} offset 5m) f(m offset 10m)`, `(m{foo="bar"} offset 10m) offset 5m`)
-	another(`with (f(x)=x{foo="bar",bas="a"}[5m]) f(m[10m] offset 3s)`, `(m{foo="bar", bas="a"}[10m] offset 3s)[5m]`)
-	another(`with (f(x)=x{foo="bar"}[5m] offset 10m) f(m{x="y"})`, `m{x="y", foo="bar"}[5m] offset 10m`)
-	another(`with (f(x)=x{foo="bar"}[5m] offset 10m) f({x="y", foo="bar", foo="bar"})`, `{x="y", foo="bar"}[5m] offset 10m`)
-	another(`with (f(m, x)=m{x}[5m] offset 10m) f(foo, {})`, `foo[5m] offset 10m`)
-	another(`with (f(m, x)=m{x, bar="baz"}[5m] offset 10m) f(foo, {})`, `foo{bar="baz"}[5m] offset 10m`)
-	another(`with (f(x)=x[5m] offset 3s) f(foo[3m]+bar)`, `(foo[3m] + bar)[5m] offset 3s`)
-	another(`with (f(x)=x[5m:3s] oFFsEt 1.5m) f(sum(s) by (a,b))`, `(sum(s) by (a, b))[5m:3s] offset 1.5m`)
-	another(`with (x="a", y=x) y+"bc"`, `"abc"`)
-	another(`with (x="a", y="b"+x) "we"+y+"z"+f()`, `"webaz" + f()`)
-	another(`with (f(x) = m{foo=x+"y", bar="y"+x, baz=x} + x) f("qwe")`, `m{foo="qwey", bar="yqwe", baz="qwe"} + "qwe"`)
-	another(`with (f(a)=a) f`, `f`)
-	another(`with (f\q(a)=a) f\q`, `fq`)
-
-	// Verify withExpr for aggr func modifiers
-	another(`with (f(x) = x, y = sum(m) by (f)) y`, `sum(m) by (f)`)
-	another(`with (f(x) = x, y = sum(m) by (f) limit 20) y`, `sum(m) by (f) limit 20`)
-	another(`with (f(x) = sum(m) by (x)) f(foo)`, `sum(m) by (foo)`)
-	another(`with (f(x) = sum(m) by (x) limit 42) f(foo)`, `sum(m) by (foo) limit 42`)
-	another(`with (f(x) = sum(m) by (x)) f((foo, bar, foo))`, `sum(m) by (foo, bar)`)
-	another(`with (f(x) = sum(m) without (x,y)) f((a, b))`, `sum(m) without (a, b, y)`)
-	another(`with (f(x) = sum(m) without (y,x)) f((a, y))`, `sum(m) without (y, a)`)
-	another(`with (f(x,y) = a + on (x,y) group_left (y,bar) b) f(foo,())`, `a + on (foo) group_left (bar) b`)
-	another(`with (f(x,y) = a + on (x,y) group_left (y,bar) b) f((foo),())`, `a + on (foo) group_left (bar) b`)
-	another(`with (f(x,y) = a + on (x,y) group_left (y,bar) b) f((foo,xx),())`, `a + on (foo, xx) group_left (bar) b`)
-
-	// Verify nested with exprs
-	another(`with (f(x) = (with(x=y) x) + x) f(z)`, `y + z`)
-	another(`with (x=foo) f(a, with (y=x) y)`, `f(a, foo)`)
-	another(`with (x=foo) a * x + (with (y=x) y) / y`, `(a * foo) + (foo / y)`)
-	another(`with (x = with (y = foo) y + x) x/x`, `(foo + x) / (foo + x)`)
-	another(`with (
-		x = {foo="bar"},
-		q = m{x, y="1"},
-		f(x) =
-			with (
-				z(y) = x + y * q
-			)
-			z(foo) / f(x)
-	)
-	f(a)`, `(a + (foo * m{foo="bar", y="1"})) / f(a)`)
-
-	// complex withExpr
-	another(`WITH (
-		treshold = (0.9),
-		commonFilters = {job="cacher", instance=~"1.2.3.4"},
-		hits = rate(cache{type="hit", commonFilters}[5m]),
-		miss = rate(cache{type="miss", commonFilters}[5m]),
-		sumByInstance(arg) = sum(arg) by (instance),
-		hitRatio = sumByInstance(hits) / sumByInstance(hits + miss)
-	)
-	hitRatio < treshold`,
-		`  (
-      (
-        sum(rate(cache{type="hit", job="cacher", instance=~"1.2.3.4"}[5m])) by (instance)
-      )
-    /
-      (
-        sum by (instance) (
-          rate(cache{type="hit", job="cacher", instance=~"1.2.3.4"}[5m]) + rate(cache{type="miss", job="cacher", instance=~"1.2.3.4"}[5m])
-        )
-      )
-  )
-<
-  0.9`)
-	another(`WITH (
-		x2(x) = x^2,
-		f(x, y) = x2(x) + x*y + x2(y)
-	)
-	f(a, 3)
-	`, `((a ^ 2) + (a * 3)) + 9`)
-	another(`WITH (
-		x2(x) = x^2,
-		f(x, y) = x2(x) + x*y + x2(y)
-	)
-	f(2, 3)
-	`, `19`)
-	another(`WITH (
-		commonFilters = {instance="foo"},
-		timeToFuckup(currv, maxv) = (maxv - currv) / rate(currv)
-	)
-	timeToFuckup(diskUsage{commonFilters}, maxDiskSize{commonFilters})`,
-		`(maxDiskSize{instance="foo"} - diskUsage{instance="foo"}) / rate(diskUsage{instance="foo"})`)
-	another(`WITH (
-	       commonFilters = {job="foo", instance="bar"},
-	       sumRate(m, cf) = sum(rate(m{cf})) by (job, instance),
-	       hitRate(hits, misses) = sumRate(hits, commonFilters) / (sumRate(hits, commonFilters) + sumRate(misses, commonFilters))
-	   )
-	   hitRate(cacheHits, cacheMisses)`,
-		`  (
-    sum(rate(cacheHits{job="foo", instance="bar"})) by (job, instance)
-  )
-/
-  (
-      (
-        sum(rate(cacheHits{job="foo", instance="bar"})) by (job, instance)
-      )
-    +
-      (
-        sum(rate(cacheMisses{job="foo", instance="bar"})) by (job, instance)
-      )
-  )`)
-	another(`with(y=123,z=5) union(with(y=3,f(x)=x*y) f(2) + f(3), with(x=5,y=2) x*y*z)`, `union(15, 50)`)
-
-	another(`with(sum=123,now=5) union(with(sum=3,f(x)=x*sum) f(2) + f(3), with(x=5,sum=2) x*sum*now)`, `union(15, 50)`)
-	another(`WITH(now = sum(rate(my_metric_total)), before = sum(rate(my_metric_total) offset 1h)) now/before*100`, `(sum(rate(my_metric_total)) / sum(rate(my_metric_total) offset 1h)) * 100`)
-	another(`with (sum = x) sum`, `x`)
-	another(`with (clamp_min=x) clamp_min`, `x`)
-	another(`with (now=now(), sum=sum()) now`, `now()`)
-	another(`with (now=now(), sum=sum()) now()`, `now()`)
-	another(`with (now(a)=now()+a) now(1)`, `now() + 1`)
-	another(`with (rate(a,b)=a+b) rate(1,2)`, `3`)
-	another(`with (now=now(), sum=sum()) x`, `x`)
-	another(`with (rate(a) = b) c`, `c`)
-	another(`rate(x) + with (rate(a,b)=a*b) rate(2,b)`, `rate(x) + (2 * b)`)
-	another(`with (sum(a,b)=a+b) sum(c,d)`, `c + d`)
-}
-
-func TestPrettierShot(t *testing.T) {
-	another := func(s, expected string) {
-		t.Helper()
-
-		const maxLineLength = 80
-		got, err := Prettify(s, maxLineLength)
-		if err != nil {
-			t.Fatalf("unexpected error when parsing %q: %s", s, err)
-		}
-
-		if expected != got {
-			t.Fatalf("string not prettified;\ngot:%s\nwant\n%q", got, expected)
-		}
-	}
-	same := func(s string) {
-		t.Helper()
-		another(s, s)
-	}
-
-	same(`{}`)
-	same(`{}[5m]`)
-	same(`{}[5m:]`)
-	same(`{}[5M:]`)
-	same(`{}[:]`)
-	another(`{}[: ]`, `{}[:]`)
-	same(`{}[:3s]`)
-	another(`{}[: 3s ]`, `{}[:3s]`)
-	same(`{}[5m:3s]`)
-	another(`{}[ 5m : 3s ]`, `{}[5m:3s]`)
-	same(`{} offset 5m`)
-	same(`{} offset -5m`)
-	same(`{} offset 5M`)
-	same(`{}[5m] offset 10y`)
-	same(`{}[5.3m:3.4s] offset 10y`)
-	same(`{}[:3.4s] offset 10y`)
-	same(`{}[:3.4s] offset -10y`)
-	same(`{Foo="bAR"}`)
-	same(`{foo="bar"}`)
-	same(`{foo="bar"}[5m]`)
-	same(`{foo="bar"}[5m:]`)
-	same(`{foo="bar"}[5m:3s]`)
-	same(`{foo="bar"} offset 13.4ms`)
-	same(`{foo="bar"}[5w4h-3.4m13.4ms]`)
-	same(`{foo="bar"} offset 10y`)
-	same(`{foo="bar"} offset -10y`)
-	same(`{foo="bar"}[5m] offset 10y`)
-	same(`{foo="bar"}[5m:3s] offset 10y`)
-	another(`{foo="bar"}[5m] oFFSEt 10y`, `{foo="bar"}[5m] offset 10y`)
-	same("METRIC")
-	same("metric")
-	same("m_e:tri44:_c123")
-	another("-metric", "0 - metric")
-	same(`metric offset 10h`)
-	same("metric[5m]")
-	same("metric[5m:3s]")
-	same("metric[5m] offset 10h")
-	same("metric[5m:3s] offset 10h")
-	same("metric[5i:3i] offset 10i")
-	same(`metric{foo="bar"}`)
-	same(`metric{foo="bar"} offset 10h`)
-	same(`metric{foo!="bar"}[2d]`)
-	same(`metric{foo="bar"}[2d] offset 10h`)
-	same(`metric{foo="bar", b="sdfsdf"}[2d:3h] offset 10h`)
-	same(`metric{foo="bar", b="sdfsdf"}[2d:3h] offset 10`)
-	same(`metric{foo="bar", b="sdfsdf"}[2d:3] offset 10h`)
-	same(`metric{foo="bar", b="sdfsdf"}[2:3h] offset 10h`)
-	same(`metric{foo="bar", b="sdfsdf"}[2.34:5.6] offset 3600.5`)
-	same(`metric{foo="bar", b="sdfsdf"}[234:56] offset -3600`)
-	another(`  metric  {  foo  = "bar"  }  [  2d ]   offset   10h  `, `metric{foo="bar"}[2d] offset 10h`)
-	// @ modifier
-	// See https://prometheus.io/docs/prometheus/latest/querying/basics/#modifier
-	same(`foo @ 123.45`)
-	same(`foo\@ @ 123.45`)
-	same(`{foo=~"bar"} @ end()`)
-	same(`foo{bar="baz"} @ start()`)
-	same(`foo{bar="baz"}[5m] @ 12345`)
-	same(`foo{bar="baz"}[5m:4s] offset 5m @ (end() - 3.5m)`)
-	another(`foo{bar="baz"}[5m:4s] @ (end() - 3.5m) offset 2.4h`, `foo{bar="baz"}[5m:4s] offset 2.4h @ (end() - 3.5m)`)
-	another(`foo @ start() + (bar offset 3m @ end()) / baz OFFSET -5m`, `foo @ start() + (bar offset 3m @ end() / baz offset -5m)`)
-	same(`sum(foo) @ start() + rate(bar @ (end() - 5m))`)
-	another(`time() @ (start())`, `time() @ start()`)
-	another(`time() @ (start()+(1+1))`, `time() @ (start() + 2)`)
-	same(`time() @ (end() - 10m)`)
-	// metric name matching keywords
-	same("rate")
-	same("RATE")
-	same("by")
-	same("BY")
-	same("bool")
-	same("BOOL")
-	same("unless")
-	same("UNLESS")
-	same("Ignoring")
-	same("with")
-	same("WITH")
-	same("With")
-	same("offset")
-	same("keep_metric_names")
-	same("alias")
-	same(`alias{foo="bar"}`)
-	same(`aLIas{alias="aa"}`)
-	another(`al\ias`, `alias`)
-	// identifiers with with escape chars
-	same(`foo\ bar`)
-	same(`foo\-bar\{{baz\+bar="aa"}`)
-	another(`\x2E\x2ef\oo{b\xEF\ar="aa"}`, `\..foo{bïar="aa"}`)
-	same(`温度{房间="水电费"}[5m] offset 10m`)
-	another(`\温\度{\房\间="水电费"}[5m] offset 10m`, `温度{房间="水电费"}[5m] offset 10m`)
-	same(`sum(fo\|o) by (b\|a, x)`)
-	another(`sum(x) by (b\x7Ca)`, `sum(x) by (b\|a)`)
-	// Duplicate filters
-	same(`foo{__name__="bar"}`)
-	same(`foo{a="b", a="c", __name__="aaa", b="d"}`)
-	// Metric filters ending with comma
-	another(`m{foo="bar",}`, `m{foo="bar"}`)
-	// String concat in tag value
-	another(`m{foo="bar" + "baz"}`, `m{foo="barbaz"}`)
-
-	// Valid regexp
-	same(`foo{bar=~"x"}`)
-	same(`foo{bar=~"^x"}`)
-	same(`foo{bar=~"^x$"}`)
-	same(`foo{bar=~"^(a[bc]|d)$"}`)
-	same(`foo{bar!~"x"}`)
-	same(`foo{bar!~"^x"}`)
-	same(`foo{bar!~"^x$"}`)
-	same(`foo{bar!~"^(a[bc]|d)$"}`)
-
-	// stringExpr
-	same(`""`)
-	same(`"\n\t\r 12:{}[]()44"`)
-	another(`''`, `""`)
-	another("``", `""`)
-	another("   `foo\"b'ar`  ", "\"foo\\\"b'ar\"")
-	another(`  'foo\'bar"BAZ'  `, `"foo'bar\"BAZ"`)
-	// string concat
-	another(`"foo"+'bar'`, `"foobar"`)
-
-	// numberExpr
-	same(`1`)
-	same(`123.`)
-	another(`-123.`, `-123`)
-	same(`foo - 123.`)
-	same(`12.e+4`)
-	same(`12Ki`)
-	same(`1.23Gb`)
-	same(`foo - 23M`)
-	another(`-1.23Gb`, `-1.23e+09`)
-	same(`1.23`)
-	same(`0.23`)
-	same(`1.2e+45`)
-	same(`1.2e-45`)
-	same(`-1`)
-	same(`-1.23`)
-	same(`-0.23`)
-	same(`-1.2e+45`)
-	same(`-1.2e-45`)
-	same(`-1.2e-45`)
-	same(`12.5E34`)
-	another(`-.2`, `-0.2`)
-	another(`-.2E-2`, `-0.002`)
-	same(`NaN`)
-	same(`nan`)
-	same(`NAN`)
-	same(`nAN`)
-	same(`Inf`)
-	same(`INF`)
-	same(`inf`)
-	another(`+Inf`, `Inf`)
-	same(`-Inf`)
-	another(`-inF`, `-Inf`)
-	same(`0x12`)
-	same(`0x3b`)
-	another(`-0x3b`, `-59`)
-	another(`+0X3B`, `0X3B`)
-	same(`0b1011`)
-	same(`073`)
-	another(`-0o12`, `-10`)
-
-	// durationExpr
-	same(`1h`)
-	another(`-1h`, `0 - 1h`)
-	same(`0.34h4m5s`)
-	same(`0.34H4m5S`)
-	another(`-0.34h4m5s`, `0 - 0.34h4m5s`)
-	same(`sum_over_tme(m[1h]) / 1h`)
-	same(`sum_over_time(m[3600]) / 3600`)
-
-	// binaryOpExpr
-	another(`nan == nan`, `NaN`)
-	another(`nan ==bool nan`, `1`)
-	another(`nan !=bool nan`, `0`)
-	another(`nan !=bool 2`, `1`)
-	another(`2 !=bool nan`, `1`)
-	another(`nan >bool nan`, `0`)
-	another(`nan <bool nan`, `0`)
-	another(`1 ==bool nan`, `0`)
-	another(`NaN !=bool 1`, `1`)
-	another(`inf >=bool 2`, `1`)
-	another(`-1 >bool -inf`, `1`)
-	another(`-1 <bool -inf`, `0`)
-	another(`nan + 2 *3 * inf`, `NaN`)
-	another(`INF - Inf`, `NaN`)
-	another(`Inf + inf`, `+Inf`)
-	another(`1/0`, `+Inf`)
-	another(`0/0`, `NaN`)
-	another(`-m`, `0 - m`)
-	same(`m + ignoring () n[5m]`)
-	another(`M + IGNORING () N[5m]`, `M + ignoring () N[5m]`)
-	same(`m + on (foo) n[5m]`)
-	another(`m + ON (Foo) n[5m]`, `m + on (Foo) n[5m]`)
-	same(`m + ignoring (a, b) n[5m]`)
-	another(`1 or 2`, `1`)
-	another(`1 and 2`, `1`)
-	another(`1 unless 2`, `NaN`)
-	another(`1 default 2`, `1`)
-	another(`1 default NaN`, `1`)
-	another(`NaN default 2`, `2`)
-	another(`1 > 2`, `NaN`)
-	another(`1 > bool 2`, `0`)
-	another(`3 >= 2`, `3`)
-	another(`3 <= bool 2`, `0`)
-	another(`1 + -2 - 3`, `-4`)
-	another(`1 / 0 + 2`, `+Inf`)
-	another(`2 + -1 / 0`, `-Inf`)
-	another(`(-1) ^ 0.5`, `NaN`)
-	another(`-1 ^ 0.5`, `-1`)
-	another(`512.5 - (1 + 3) * (2 ^ 2) ^ 3`, `256.5`)
-	another(`1 == bool 1 != bool 24 < bool 4 > bool -1`, `1`)
-	another(`1 == bOOl 1 != BOOL 24 < Bool 4 > booL -1`, `1`)
-	another(`m1+on(foo)group_left m2`, `m1 + on (foo) group_left () m2`)
-	another(`M1+ON(FOO)GROUP_left M2`, `M1 + on (FOO) group_left () M2`)
-	same(`m1 + on (foo) group_right () m2`)
-	same(`m1 + on (foo, bar) group_right (x, y) m2`)
-	another(`m1 + on (foo, bar,) group_right (x, y,) m2`, `m1 + on (foo, bar) group_right (x, y) m2`)
-	same(`m1 == bool on (foo, bar) group_right (x, y) m2`)
-	another(`5 - 1 + 3 * 2 ^ 2 ^ 3 - 2  OR Metric {Bar= "Baz", aaa!="bb",cc=~"dd" ,zz !~"ff" } `,
-		`770 or Metric{Bar="Baz", aaa!="bb", cc=~"dd", zz!~"ff"}`)
-	same(`"foo" + bar()`)
-	same(`"foo" + bar{x="y"}`)
-	same(`("foo"[3s] + bar{x="y"})[5m:3s] offset 10s`)
-	same(`("foo"[3s] + bar{x="y"})[5i:3i] offset 10i`)
-	same(`bar + "foo" offset 3s`)
-	same(`bar + "foo" offset 3i`)
-	another(`1+2 if 2>3`, `NaN`)
-	another(`1+4 if 2<3`, `5`)
-	another(`2+6 default 3 if 2>3`, `8`)
-	another(`2+6 if 2>3 default NaN`, `NaN`)
-	another(`42 if 3>2 if 2+2<5`, `42`)
-	another(`42 if 3>2 if 2+2>=5`, `NaN`)
-	another(`1+2 ifnot 2>3`, `3`)
-	another(`1+4 ifnot 2<3`, `NaN`)
-	another(`2+6 default 3 ifnot 2>3`, `8`)
-	another(`2+6 ifnot 2>3 default NaN`, `8`)
-	another(`42 if 3>2 ifnot 2+2<5`, `NaN`)
-	another(`42 if 3>2 ifnot 2+2>=5`, `42`)
-	another(`"foo" + "bar"`, `"foobar"`)
-	another(`"foo"=="bar"`, `NaN`)
-	another(`"foo"=="foo"`, `1`)
-	another(`"foo"!="bar"`, `1`)
-	another(`"foo"+"bar"+"baz"`, `"foobarbaz"`)
-	another(`"a">"b"`, `NaN`)
-	another(`"a">bool"b"`, `0`)
-	another(`"a"<"b"`, `1`)
-	another(`"a">="b"`, `NaN`)
-	another(`"a">=bool"b"`, `0`)
-	another(`"a"<="b"`, `1`)
-	same(`"a" - "b"`)
-
-	// parensExpr
-	another(`(-foo + ((bar) / (baz))) + ((23))`, `((0 - foo) + (bar / baz)) + 23`)
-	another(`(FOO + ((Bar) / (baZ))) + ((23))`, `(FOO + (Bar / baZ)) + 23`)
-	same(`(foo, bar)`)
-	another(`((foo, bar),(baz))`, `((foo, bar), baz)`)
-	same(`(foo, (bar, baz), ((x, y), (z, y), xx))`)
-	another(`1+(foo, bar,)`, `1 + (foo, bar)`)
-	another(`((foo(bar,baz)), (1+(2)+(3,4)+()))`, `(foo(bar, baz), (3 + (3, 4)) + ())`)
-	same(`()`)
-
-	// funcExpr
-	same(`f()`)
-	another(`f(x,)`, `f(x)`)
-	another(`-f()-Ff()`, `(0 - f()) - Ff()`)
-	same(`F()`)
-	another(`+F()`, `F()`)
-	another(`++F()`, `F()`)
-	another(`--F()`, `0 - (0 - F())`)
-	same(`f(http_server_request)`)
-	same(`f(http_server_request)[4s:5m] offset 10m`)
-	same(`f(http_server_request)[4i:5i] offset 10i`)
-	same(`F(HttpServerRequest)`)
-	same(`f(job, foo)`)
-	same(`F(Job, Foo)`)
-	another(` FOO (bar) + f  (  m  (  ),ff(1 + (  2.5)) ,M[5m ]  , "ff"  )`, `FOO(bar) + f(m(), ff(3.5), M[5m], "ff")`)
-	same(`rate(foo[5m]) keep_metric_names`)
-	another(`log2(foo) KEEP_metric_names + 1 / increase(bar[5m]) keep_metric_names offset 1h @ 435`,
-		`  log2(foo) keep_metric_names
-+
-  (
-    1 / increase(bar[5m]) keep_metric_names offset 1h @ 435
-  )`)
-	// funcName matching keywords
-	same(`by(2)`)
-	same(`BY(2)`)
-	same(`or(2)`)
-	same(`OR(2)`)
-	same(`bool(2)`)
-	same(`BOOL(2)`)
-	same(`rate(rate(m))`)
-	same(`rate(rate(m[5m]))`)
-	same(`rate(rate(m[5m])[1h:])`)
-	same(`rate(rate(m[5m])[1h:3s])`)
-	// funcName with escape chars
-	same(`foo\(ba\-r()`)
-
-	// aggrFuncExpr
-	same(`sum(http_server_request) by ()`)
-	same(`sum(http_server_request) by (job)`)
-	same(`sum(http_server_request) without (job, foo)`)
-	another(`sum(x,y,) without (a,b,)`, `sum(x, y) without (a, b)`)
-	another(`sum by () (xx)`, `sum(xx) by ()`)
-	another(`sum by (s) (xx)[5s]`, `(sum(xx) by (s))[5s]`)
-	another(`SUM BY (ZZ, aa) (XX)`, `sum(XX) by (ZZ, aa)`)
-	another(`sum without (a, b) (xx,2+2)`, `sum(xx, 4) without (a, b)`)
-	another(`Sum WIthout (a, B) (XX,2+2)`, `sum(XX, 4) without (a, B)`)
-	same(`sum(a) or sum(b)`)
-	same(`sum(a) by () or sum(b) without (x, y)`)
-	same(`sum(a) + sum(b)`)
-	same(`sum(x) * (1 + sum(a))`)
-	same(`avg(x) limit 10`)
-	same(`avg(x) without (z, b) limit 1`)
-	another(`avg by(x) (z) limit 20`, `avg(z) by (x) limit 20`)
-
-	// All the above
-	another(`Sum(Ff(M) * M{X=""}[5m] Offset 7m - 123, 35) BY (X, y) * F2("Test")`,
-		`sum((Ff(M) * M{X=""}[5m] offset 7m) - 123, 35) by (X, y) * F2("Test")`)
-	another(`# comment
-		Sum(Ff(M) * M{X=""}[5m] Offset 7m - 123, 35) BY (X, y) # yet another comment
-		* F2("Test")`,
-		`sum((Ff(M) * M{X=""}[5m] offset 7m) - 123, 35) by (X, y) * F2("Test")`)
-
-	// withExpr
-	another(`with () x`, `x`)
-	another(`with (x=1,) x`, `1`)
-	another(`with (x = m offset 5h) x + x`, `m offset 5h + m offset 5h`)
-	another(`with (x = m offset 5i) x + x`, `m offset 5i + m offset 5i`)
-	another(`with (foo = bar{x="x"}) 1`, `1`)
-	another(`with (foo = bar{x="x"}) "x"`, `"x"`)
-	another(`with (f="x") f`, `"x"`)
-	another(`with (foo = bar{x="x"}) x{x="y"}`, `x{x="y"}`)
-	another(`with (foo = bar{x="x"}) 1+1`, `2`)
-	another(`with (foo = bar{x="x"}) f()`, `f()`)
-	another(`with (foo = bar{x="x"}) sum(x)`, `sum(x)`)
-	another(`with (foo = bar{x="x"}) baz{foo="bar"}`, `baz{foo="bar"}`)
-	another(`with (foo = bar) baz`, `baz`)
-	another(`with (foo = bar) foo + foo{a="b"}`, `bar + bar{a="b"}`)
-	another(`with (foo = bar, bar=baz + f()) test`, `test`)
-	another(`with (ct={job="test"}) a{ct} + ct() + f({ct="x"})`, `(a{job="test"} + {job="test"}) + f({ct="x"})`)
-	another(`with (ct={job="test", i="bar"}) ct + {ct, x="d"} + foo{ct, ct} + ctx(1)`,
-		`  (
-      (
-        {job="test", i="bar"} + {job="test", i="bar", x="d"}
-      )
-    +
-      foo{job="test", i="bar"}
-  )
-+
-  ctx(1)`)
-	another(`with (foo = bar) {__name__=~"foo"}`, `{__name__=~"foo"}`)
-	another(`with (foo = bar) foo{__name__="foo"}`, `bar`)
-	another(`with (foo = bar) {__name__="foo", x="y"}`, `bar{x="y"}`)
-	another(`with (foo(bar) = {__name__!="bar"}) foo(x)`, `{__name__!="bar"}`)
-	another(`with (foo(bar) = bar{__name__="bar"}) foo(x)`, `x`)
-	another(`with (foo\-bar(baz) = baz + baz) foo\-bar((x,y))`, `(x, y) + (x, y)`)
-	another(`with (foo\-bar(baz) = baz + baz) foo\-bar(x*y)`, `(x * y) + (x * y)`)
-	another(`with (foo\-bar(baz) = baz + baz) foo\-bar(x\*y)`, `x\*y + x\*y`)
-	another(`with (foo\-bar(b\ az) = b\ az + b\ az) foo\-bar(x\*y)`, `x\*y + x\*y`)
-	// override ttf to something new.
-	another(`with (ttf = a) ttf + b`, `a + b`)
-	// override ttf to ru
-	another(`with (ttf = ru(m, n)) ttf`, `(clamp_min(n - clamp_min(m, 0), 0) / clamp_min(n, 0)) * 100`)
-
-	// Verify withExpr recursion and forward reference
-	another(`with (x = x+y, y = x+x) y ^ 2`, `((x + y) + (x + y)) ^ 2`)
-	another(`with (f1(x)=f2(x), f2(x)=f1(x)^2) f1(foobar)`, `f2(foobar)`)
-	another(`with (f1(x)=f2(x), f2(x)=f1(x)^2) f2(foobar)`, `f2(foobar) ^ 2`)
-
-	// Verify withExpr funcs
-	another(`with (x() = y+1) x`, `y + 1`)
-	another(`with (x(foo) = foo+1) x(a)`, `a + 1`)
-	another(`with (x(a, b) = a + b) x(foo, bar)`, `foo + bar`)
-	another(`with (x(a, b) = a + b) x(foo, x(1, 2))`, `foo + 3`)
-	another(`with (x(a) = sum(a) by (b)) x(xx) / x(y)`, `sum(xx) by (b) / sum(y) by (b)`)
-	another(`with (f(a,f,x)=ff(x,f,a)) f(f(x,y,z),1,2)`, `ff(2, 1, ff(z, y, x))`)
-	another(`with (f(x)=1+f(x)) f(foo{bar="baz"})`, `1 + f(foo{bar="baz"})`)
-	another(`with (a=foo, y=bar, f(a)= a+a+y) f(x)`, `(x + x) + bar`)
-	another(`with (f(a, b) = m{a, b}) f({a="x", b="y"}, {c="d"})`, `m{a="x", b="y", c="d"}`)
-	another(`with (xx={a="x"}, f(a, b) = m{a, b}) f({xx, b="y"}, {c="d"})`, `m{a="x", b="y", c="d"}`)
-	another(`with (x() = {b="c"}) foo{x}`, `foo{b="c"}`)
-	another(`with (f(x)=x{foo="bar"} offset 5m) f(m offset 10m)`, `(m{foo="bar"} offset 10m) offset 5m`)
-	another(`with (f(x)=x{foo="bar",bas="a"}[5m]) f(m[10m] offset 3s)`, `(m{foo="bar", bas="a"}[10m] offset 3s)[5m]`)
-	another(`with (f(x)=x{foo="bar"}[5m] offset 10m) f(m{x="y"})`, `m{x="y", foo="bar"}[5m] offset 10m`)
-	another(`with (f(x)=x{foo="bar"}[5m] offset 10m) f({x="y", foo="bar", foo="bar"})`, `{x="y", foo="bar"}[5m] offset 10m`)
-	another(`with (f(m, x)=m{x}[5m] offset 10m) f(foo, {})`, `foo[5m] offset 10m`)
-	another(`with (f(m, x)=m{x, bar="baz"}[5m] offset 10m) f(foo, {})`, `foo{bar="baz"}[5m] offset 10m`)
-	another(`with (f(x)=x[5m] offset 3s) f(foo[3m]+bar)`, `(foo[3m] + bar)[5m] offset 3s`)
-	another(`with (f(x)=x[5m:3s] oFFsEt 1.5m) f(sum(s) by (a,b))`, `(sum(s) by (a, b))[5m:3s] offset 1.5m`)
-	another(`with (x="a", y=x) y+"bc"`, `"abc"`)
-	another(`with (x="a", y="b"+x) "we"+y+"z"+f()`, `"webaz" + f()`)
-	another(`with (f(x) = m{foo=x+"y", bar="y"+x, baz=x} + x) f("qwe")`, `m{foo="qwey", bar="yqwe", baz="qwe"} + "qwe"`)
-	another(`with (f(a)=a) f`, `f`)
-	another(`with (f\q(a)=a) f\q`, `fq`)
-
-	// Verify withExpr for aggr func modifiers
-	another(`with (f(x) = x, y = sum(m) by (f)) y`, `sum(m) by (f)`)
-	another(`with (f(x) = x, y = sum(m) by (f) limit 20) y`, `sum(m) by (f) limit 20`)
-	another(`with (f(x) = sum(m) by (x)) f(foo)`, `sum(m) by (foo)`)
-	another(`with (f(x) = sum(m) by (x) limit 42) f(foo)`, `sum(m) by (foo) limit 42`)
-	another(`with (f(x) = sum(m) by (x)) f((foo, bar, foo))`, `sum(m) by (foo, bar)`)
-	another(`with (f(x) = sum(m) without (x,y)) f((a, b))`, `sum(m) without (a, b, y)`)
-	another(`with (f(x) = sum(m) without (y,x)) f((a, y))`, `sum(m) without (y, a)`)
-	another(`with (f(x,y) = a + on (x,y) group_left (y,bar) b) f(foo,())`, `a + on (foo) group_left (bar) b`)
-	another(`with (f(x,y) = a + on (x,y) group_left (y,bar) b) f((foo),())`, `a + on (foo) group_left (bar) b`)
-	another(`with (f(x,y) = a + on (x,y) group_left (y,bar) b) f((foo,xx),())`, `a + on (foo, xx) group_left (bar) b`)
-
-	// Verify nested with exprs
-	another(`with (f(x) = (with(x=y) x) + x) f(z)`, `y + z`)
-	another(`with (x=foo) f(a, with (y=x) y)`, `f(a, foo)`)
-	another(`with (x=foo) a * x + (with (y=x) y) / y`, `(a * foo) + (foo / y)`)
-	another(`with (x = with (y = foo) y + x) x/x`, `(foo + x) / (foo + x)`)
-	another(`with (
-		x = {foo="bar"},
-		q = m{x, y="1"},
-		f(x) =
-			with (
-				z(y) = x + y * q
-			)
-			z(foo) / f(x)
-	)
-	f(a)`, `(a + (foo * m{foo="bar", y="1"})) / f(a)`)
-
-	// complex withExpr
-	another(`WITH (
-		treshold = (0.9),
-		commonFilters = {job="cacher", instance=~"1.2.3.4"},
-		hits = rate(cache{type="hit", commonFilters}[5m]),
-		miss = rate(cache{type="miss", commonFilters}[5m]),
-		sumByInstance(arg) = sum(arg) by (instance),
-		hitRatio = sumByInstance(hits) / sumByInstance(hits + miss)
-	)
-	hitRatio < treshold`,
-		`  (
-      (
-        sum by (instance) (
-          rate(cache{type="hit", job="cacher", instance=~"1.2.3.4"}[5m])
-        )
-      )
-    /
-      (
-        sum by (instance) (
-            rate(cache{type="hit", job="cacher", instance=~"1.2.3.4"}[5m])
-          +
-            rate(cache{type="miss", job="cacher", instance=~"1.2.3.4"}[5m])
-        )
-      )
-  )
-<
-  0.9`)
-	another(`WITH (
-		x2(x) = x^2,
-		f(x, y) = x2(x) + x*y + x2(y)
-	)
-	f(a, 3)
-	`, `((a ^ 2) + (a * 3)) + 9`)
-	another(`WITH (
-		x2(x) = x^2,
-		f(x, y) = x2(x) + x*y + x2(y)
-	)
-	f(2, 3)
-	`, `19`)
-	another(`WITH (
-		commonFilters = {instance="foo"},
-		timeToFuckup(currv, maxv) = (maxv - currv) / rate(currv)
-	)
-	timeToFuckup(diskUsage{commonFilters}, maxDiskSize{commonFilters})`,
-		`  (
-    maxDiskSize{instance="foo"} - diskUsage{instance="foo"}
-  )
-/
-  rate(diskUsage{instance="foo"})`)
-	another(`WITH (
-	       commonFilters = {job="foo", instance="bar"},
-	       sumRate(m, cf) = sum(rate(m{cf})) by (job, instance),
-	       hitRate(hits, misses) = sumRate(hits, commonFilters) / (sumRate(hits, commonFilters) + sumRate(misses, commonFilters))
-	   )
-	   hitRate(cacheHits, cacheMisses)`,
-		`  (
-    sum(rate(cacheHits{job="foo", instance="bar"})) by (job, instance)
-  )
-/
-  (
-      (
-        sum(rate(cacheHits{job="foo", instance="bar"})) by (job, instance)
-      )
-    +
-      (
-        sum(rate(cacheMisses{job="foo", instance="bar"})) by (job, instance)
-      )
-  )`)
-	another(`with(y=123,z=5) union(with(y=3,f(x)=x*y) f(2) + f(3), with(x=5,y=2) x*y*z)`, `union(15, 50)`)
-
-	another(`with(sum=123,now=5) union(with(sum=3,f(x)=x*sum) f(2) + f(3), with(x=5,sum=2) x*sum*now)`, `union(15, 50)`)
-	another(`WITH(now = sum(rate(my_metric_total)), before = sum(rate(my_metric_total) offset 1h)) now/before*100`, `(sum(rate(my_metric_total)) / sum(rate(my_metric_total) offset 1h)) * 100`)
-	another(`with (sum = x) sum`, `x`)
-	another(`with (clamp_min=x) clamp_min`, `x`)
-	another(`with (now=now(), sum=sum()) now`, `now()`)
-	another(`with (now=now(), sum=sum()) now()`, `now()`)
-	another(`with (now(a)=now()+a) now(1)`, `now() + 1`)
-	another(`with (rate(a,b)=a+b) rate(1,2)`, `3`)
-	another(`with (now=now(), sum=sum()) x`, `x`)
-	another(`with (rate(a) = b) c`, `c`)
-	another(`rate(x) + with (rate(a,b)=a*b) rate(2,b)`, `rate(x) + (2 * b)`)
-	another(`with (sum(a,b)=a+b) sum(c,d)`, `c + d`)
-
-}
-
-func TestLongExpressions(t *testing.T) {
-	another := func(s, expected string) {
-		t.Helper()
-
-		const maxLineLength = 10
-		got, err := Prettify(s, maxLineLength)
-		if err != nil {
-			t.Fatalf("unexpected error when parsing %q: %s", s, err)
-		}
-
-		if expected != got {
-			t.Fatalf("string not prettified;\ngot:%s\nwant\n%q", got, expected)
-		}
-	}
-
-	another(`((node_memory_MemTotal_bytes{instance=~"node:port", job=~"job"}-node_memory_MemFree_bytes{instance=~"node:port", job=~"job"})/node_memory_MemTotal_bytes{instance=~"node:port", job=~"job"})*100`, `  (
-      (
-          node_memory_MemTotal_bytes{instance=~"node:port", job=~"job"}
-        -
-          node_memory_MemFree_bytes{instance=~"node:port", job=~"job"}
-      )
-    /
-      node_memory_MemTotal_bytes{instance=~"node:port", job=~"job"}
-  )
-*
-  100`)
-	another(`(((count(count(node_cpu_seconds_total{instance=~"node:port",job=~"job"}) by (cpu)))-avg(sum by (mode) (rate(node_cpu_seconds_total{mode='idle',instance=~"node:port",job=~"job"}[5m]))))*100)/count(count(node_cpu_seconds_total{instance=~"node:port",job=~"job"}) by (cpu))`, `  (
-      (
-          (
-            count (
-              count by (cpu) (
-                node_cpu_seconds_total{instance=~"node:port", job=~"job"}
-              )
-            )
-          )
-        -
-          (
-            avg (
-              sum by (mode) (
-                rate (
-                  node_cpu_seconds_total{mode="idle", instance=~"node:port", job=~"job"}[5m]
-                )
-              )
-            )
-          )
-      )
-    *
-      100
-  )
-/
-  (
-    count (
-      count by (cpu) (
-        node_cpu_seconds_total{instance=~"node:port", job=~"job"}
-      )
-    )
-  )`)
-	another(`sum by(job,foo) (sum by(job,foo) (sum by(job,foo) (task:errors:rate10s{job="s"})))`, `sum by (job, foo) (
-  sum by (job, foo) (
-    sum by (job, foo) (
-      task:errors:rate10s{job="s"}
-    )
-  )
-)`)
-	another(`foo_1 + ignoring(foo) foo_2 + ignoring(job) group_left foo_3 + on(instance) group_right foo_4`, `  (
-      (
-          foo_1
-        + ignoring (foo)
-          foo_2
-      )
-    + ignoring (job) group_left ()
-      foo_3
-  )
-+ on (instance) group_right ()
-  foo_4`)
-	another(`irate(very_long_vector_selector[10m:1m] @ start() offset 1m)`, `irate (
-  very_long_vector_selector[10m:1m] offset 1m @ (start())
-)`)
-	another(`histogram_quantile(0.9, rate(instance_cpu_time_seconds{app="webapp", job="agent", instance="cluster-admin"}[5m]))`, `histogram_quantile (
-  0.9,
-  rate (
-    instance_cpu_time_seconds{app="webapp", job="agent", instance="cluster-admin"}[5m]
-  )
-)`)
-	another(`topk(10, (sum without(env) (instance_cpu_time_ns{app="app", job="admin", revision="14d2e34", env="dev", job="cluster-admin"})))`, `topk (
-  10,
-  sum without (env) (
-    instance_cpu_time_ns{app="app", job="admin", revision="14d2e34", env="dev", job="cluster-admin"}
-  )
-)`)
-	another(`max_over_time(rate(new_http_request_duration_seconds_count[1m])[1m:] @ start() offset 1m)`, `max_over_time (
-  rate (
-    new_http_request_duration_seconds_count[1m]
-  )[1m:] offset 1m @ (start())
-)`)
-	another(`label_replace(label_replace(up{job="vmadmin",service="host:port"}, "foo", "$1", "service", "(.*):.*"), "foo", "$1", "service", "(.*):.*")`, `label_replace (
-  label_replace (
-    up{job="vmadmin", service="host:port"},
-    "foo",
-    "$1",
-    "service",
-    "(.*):.*"
-  ),
-  "foo",
-  "$1",
-  "service",
-  "(.*):.*"
-)`)
-	another(`min(vm_free_disk_space_bytes{job=~"job_storage", instance=~"instance"}/ignoring(path) ((rate(vm_rows_added_to_storage_total{job=~"job_storage", instance=~"instance"}[1d])-ignoring(type) rate(vm_deduplicated_samples_total{job=~"job_storage", instance=~"instance", type="merge"}[1d])) * scalar(sum(vm_data_size_bytes{job=~"job_storage", instance=~"instance", type!~"indexdb.*"})/sum(vm_rows{job=~"job_storage", instance=~"instance", type!~"indexdb.*"}))))`, `min (
-    vm_free_disk_space_bytes{job=~"job_storage", instance=~"instance"}
-  / ignoring (path)
-    (
-        (
-            rate (
-              vm_rows_added_to_storage_total{job=~"job_storage", instance=~"instance"}[1d]
-            )
-          - ignoring (type)
-            rate (
-              vm_deduplicated_samples_total{job=~"job_storage", instance=~"instance", type="merge"}[1d]
-            )
-        )
-      *
-        scalar (
-            (
-              sum (
-                vm_data_size_bytes{job=~"job_storage", instance=~"instance", type!~"indexdb.*"}
-              )
-            )
-          /
-            (
-              sum (
-                vm_rows{job=~"job_storage", instance=~"instance", type!~"indexdb.*"}
-              )
-            )
-        )
-    )
-)`)
-	another(`max(rate(process_cpu_seconds_total{job=~"job_storage", instance=~"instance"}[10m])/process_cpu_cores_available{job=~"job_storage", instance=~"instance"})`, `max (
-    rate (
-      process_cpu_seconds_total{job=~"job_storage", instance=~"instance"}[10m]
-    )
-  /
-    process_cpu_cores_available{job=~"job_storage", instance=~"instance"}
-)`)
-	another(`max(sum(vm_data_size_bytes{job=~"$job", instance=~"$instance"}) by(job, instance) /(sum(vm_free_disk_space_bytes{job=~"$job", instance=~"$instance"}) by(job, instance) +sum(vm_data_size_bytes{job=~"$job", instance=~"$instance"}) by(job, instance)))`, `max (
-    (
-      sum by (job, instance) (
-        vm_data_size_bytes{job=~"$job", instance=~"$instance"}
-      )
-    )
-  /
-    (
-        (
-          sum by (job, instance) (
-            vm_free_disk_space_bytes{job=~"$job", instance=~"$instance"}
-          )
-        )
-      +
-        (
-          sum by (job, instance) (
-            vm_data_size_bytes{job=~"$job", instance=~"$instance"}
-          )
-        )
-    )
-)`)
-	another(`max without (endpoint) (sum without (instance) (up{job=~".*etcd.*"} == bool 0) or count without (To) (sum without (instance) (rate(etcd_network_peer_sent_failures_total{job=~".*etcd.*"}[120s])) > 0.01))> 0`, `  (
-    max without (endpoint) (
-        (
-          sum without (instance) (
-              up{job=~".*etcd.*"}
-            == bool
-              0
-          )
-        )
-      or
-        (
-          count without (To) (
-              (
-                sum without (instance) (
-                  rate (
-                    etcd_network_peer_sent_failures_total{job=~".*etcd.*"}[120s]
-                  )
-                )
-              )
-            >
-              0.01
-          )
-        )
-    )
-  )
->
-  0`)
-	another(`histogram_quantile(0.99, sum(rate(grpc_server_handling_seconds_bucket{job=~".*etcd.*", grpc_method!="Defragment", grpc_type="unary"}[5m])) without(grpc_type))> 0.15`, `  histogram_quantile (
-    0.99,
-    sum without (grpc_type) (
-      rate (
-        grpc_server_handling_seconds_bucket{job=~".*etcd.*", grpc_method!="Defragment", grpc_type="unary"}[5m]
-      )
-    )
-  )
->
-  0.15`)
-	another(`(rate(prometheus_tsdb_head_samples_appended_total{job="prometheus"}[5m]) <= 0 and (sum without(scrape_job) (prometheus_target_metadata_cache_entries{job="prometheus"}) > 0 or sum without(rule_group) (prometheus_rule_group_rules{job="prometheus"}) > 0))`, `  (
-      rate (
-        prometheus_tsdb_head_samples_appended_total{job="prometheus"}[5m]
-      )
-    <=
-      0
-  )
-and
-  (
-      (
-          (
-            sum without (scrape_job) (
-              prometheus_target_metadata_cache_entries{job="prometheus"}
-            )
-          )
-        >
-          0
-      )
-    or
-      (
-          (
-            sum without (rule_group) (
-              prometheus_rule_group_rules{job="prometheus"}
-            )
-          )
-        >
-          0
-      )
-  )`)
-	another(`(histogram_quantile(0.90, sum by (job, instance, namespace, type, le) (rate(promscale_ingest_duration_seconds_bucket[5m]))) > 10 and sum by (job, instance, namespace, type) (rate(promscale_ingest_duration_seconds_bucket[5m]))) > 0`, `  (
-      (
-          histogram_quantile (
-            0.90,
-            sum by (job, instance, namespace, type, le) (
-              rate (
-                promscale_ingest_duration_seconds_bucket[5m]
-              )
-            )
-          )
-        >
-          10
-      )
-    and
-      (
-        sum by (job, instance, namespace, type) (
-          rate (
-            promscale_ingest_duration_seconds_bucket[5m]
-          )
-        )
-      )
-  )
->
-  0`)
-	another(`1 - ((node_memory_MemAvailable_bytes{job="node"} or (node_memory_Buffers_bytes{job="node"} + node_memory_Cached_bytes{job="node"} + node_memory_MemFree_bytes{job="node"} + node_memory_Slab_bytes{job="node"}) ) / node_memory_MemTotal_bytes{job="node"})`, `  1
--
-  (
-      (
-          node_memory_MemAvailable_bytes{job="node"}
-        or
-          (
-              (
-                  (
-                      node_memory_Buffers_bytes{job="node"}
-                    +
-                      node_memory_Cached_bytes{job="node"}
-                  )
-                +
-                  node_memory_MemFree_bytes{job="node"}
-              )
-            +
-              node_memory_Slab_bytes{job="node"}
-          )
-      )
-    /
-      node_memory_MemTotal_bytes{job="node"}
-  )`)
-	another(`(node_timex_offset_seconds{job="node"} > 0.05 and deriv(node_timex_offset_seconds{job="node"}[5m]) >= 0) or (node_timex_offset_seconds{job="node"} < -0.05 and deriv(node_timex_offset_seconds{job="node"}[5m]) <= 0)`, `  (
-      (
-          node_timex_offset_seconds{job="node"}
-        >
-          0.05
-      )
-    and
-      (
-          deriv (
-            node_timex_offset_seconds{job="node"}[5m]
-          )
-        >=
-          0
-      )
-  )
-or
-  (
-      (
-          node_timex_offset_seconds{job="node"}
-        <
-          -0.05
-      )
-    and
-      (
-          deriv (
-            node_timex_offset_seconds{job="node"}[5m]
-          )
-        <=
-          0
-      )
-  )`)
-	another(`(count by (job) (changes(process_start_time_seconds{job="alertmanager"}[10m]) > 4) / count by (job) (up{job="alertmanager"})) >= 0.5`, `  (
-      (
-        count by (job) (
-            changes (
-              process_start_time_seconds{job="alertmanager"}[10m]
-            )
-          >
-            4
-        )
-      )
-    /
-      (
-        count by (job) (
-          up{job="alertmanager"}
-        )
-      )
-  )
->=
-  0.5`)
-	another(`WITH (commonFilters = {instance=~"$node:$port",job=~"$job"}) (((count(count(node_cpu_seconds_total{commonFilters}) by (cpu)))-avg(sum by (mode) (rate(node_cpu_seconds_total{mode='idle',commonFilters}[5m]))))*100)/count(count(node_cpu_seconds_total{commonFilters}) by (cpu))`, `  (
-      (
-          (
-            count (
-              count by (cpu) (
-                node_cpu_seconds_total{instance=~"$node:$port", job=~"$job"}
-              )
-            )
-          )
-        -
-          (
-            avg (
-              sum by (mode) (
-                rate (
-                  node_cpu_seconds_total{mode="idle", instance=~"$node:$port", job=~"$job"}[5m]
-                )
-              )
-            )
-          )
-      )
-    *
-      100
-  )
-/
-  (
-    count (
-      count by (cpu) (
-        node_cpu_seconds_total{instance=~"$node:$port", job=~"$job"}
-      )
-    )
-  )`)
-	another(`WITH (commonFilters = {instance=~"$node:$port",job=~"$job"}, cpuCount = count(count(node_cpu_seconds_total{commonFilters}) by (cpu)))((cpuCount-avg(sum by (mode) (rate(node_cpu_seconds_total{mode='idle',commonFilters}[5m]))))*100) / cpuCount`, `  (
-      (
-          (
-            count (
-              count by (cpu) (
-                node_cpu_seconds_total{instance=~"$node:$port", job=~"$job"}
-              )
-            )
-          )
-        -
-          (
-            avg (
-              sum by (mode) (
-                rate (
-                  node_cpu_seconds_total{mode="idle", instance=~"$node:$port", job=~"$job"}[5m]
-                )
-              )
-            )
-          )
-      )
-    *
-      100
-  )
-/
-  (
-    count (
-      count by (cpu) (
-        node_cpu_seconds_total{instance=~"$node:$port", job=~"$job"}
-      )
-    )
-  )`)
-	another(`rate(remote_storage_samples_in_total{cluster=~"$cluster", instance=~"$instance"}[5m])- ignoring(remote_name, url) group_right(instance) (rate(remote_storage_succeeded_samples_total{cluster=~"$cluster", instance=~"$instance"}[5m]) or rate(remote_storage_samples_total{cluster=~"$cluster", instance=~"$instance"}[5m]))- (rate(remote_storage_dropped_samples_total{cluster=~"$cluster", instance=~"$instance"}[5m]) or rate(remote_storage_samples_dropped_total{cluster=~"$cluster", instance=~"$instance"}[5m]))`, `  (
-      rate (
-        remote_storage_samples_in_total{cluster=~"$cluster", instance=~"$instance"}[5m]
-      )
-    - ignoring (remote_name, url) group_right (instance)
-      (
-          rate (
-            remote_storage_succeeded_samples_total{cluster=~"$cluster", instance=~"$instance"}[5m]
-          )
-        or
-          rate (
-            remote_storage_samples_total{cluster=~"$cluster", instance=~"$instance"}[5m]
-          )
-      )
-  )
--
-  (
-      rate (
-        remote_storage_dropped_samples_total{cluster=~"$cluster", instance=~"$instance"}[5m]
-      )
-    or
-      rate (
-        remote_storage_samples_dropped_total{cluster=~"$cluster", instance=~"$instance"}[5m]
-      )
-  )`)
-}
diff --git a/prettifier.go b/prettifier.go
new file mode 100644
index 0000000..486a224
--- /dev/null
+++ b/prettifier.go
@@ -0,0 +1,201 @@
+package metricsql
+
+// Prettify returns prettified representation of MetricsQL query q.
+func Prettify(q string) (string, error) {
+	e, err := Parse(q)
+	if err != nil {
+		return "", err
+	}
+	b := appendPrettifiedExpr(nil, e, 0, false)
+	return string(b), nil
+}
+
+// maxPrettifiedLineLen is the maximum length of a single line returned by Prettify().
+//
+// Actual lines may exceed the maximum length in some cases.
+const maxPrettifiedLineLen = 80
+
+func appendPrettifiedExpr(dst []byte, e Expr, indent int, needParens bool) []byte {
+	dstLen := len(dst)
+
+	// Try appending e to dst and check whether its length exceeds the maximum allowed line length.
+	dst = appendIndent(dst, indent)
+	if needParens {
+		dst = append(dst, '(')
+	}
+	dst = e.AppendString(dst)
+	if needParens {
+		dst = append(dst, ')')
+	}
+	if len(dst)-dstLen <= maxPrettifiedLineLen {
+		// There is no need in splitting the e string representation, since its' length doesn't exceed.
+		return dst
+	}
+
+	// The e string representation exceeds maxPrettifiedLineLen. Split it into multiple lines
+	dst = dst[:dstLen]
+	if needParens {
+		dst = appendIndent(dst, indent)
+		dst = append(dst, "(\n"...)
+		indent++
+	}
+	switch t := e.(type) {
+	case *BinaryOpExpr:
+		// Split:
+		//
+		//   a op b
+		//
+		// into:
+		//
+		//   foo
+		//     op
+		//   bar
+		if t.KeepMetricNames {
+			dst = appendIndent(dst, indent)
+			dst = append(dst, "(\n"...)
+			indent++
+		}
+		dst = appendPrettifiedExpr(dst, t.Left, indent, t.needLeftParens())
+		dst = append(dst, '\n')
+		dst = appendIndent(dst, indent+1)
+		dst = t.appendModifiers(dst)
+		dst = append(dst, '\n')
+		dst = appendPrettifiedExpr(dst, t.Right, indent, t.needRightParens())
+		if t.KeepMetricNames {
+			indent--
+			dst = append(dst, '\n')
+			dst = appendIndent(dst, indent)
+			dst = append(dst, ") keep_metric_names"...)
+		}
+	case *RollupExpr:
+		// Split:
+		//
+		//   q[d:s] offset off @ x
+		//
+		// into:
+		//
+		//   (
+		//     q
+		//   )[d:s] offset off @ x
+		dst = appendPrettifiedExpr(dst, t.Expr, indent, t.needParens())
+		dst = t.appendModifiers(dst)
+	case *AggrFuncExpr:
+		// Split:
+		//
+		//   aggr_func(arg1, ..., argN) modifiers
+		//
+		// into:
+		//
+		//   aggr_func(
+		//     arg1,
+		//     ...
+		//     argN
+		//   ) modifiers
+		dst = appendIndent(dst, indent)
+		dst = appendEscapedIdent(dst, t.Name)
+		dst = appendPrettifiedFuncArgs(dst, indent, t.Args)
+		dst = t.appendModifiers(dst)
+	case *FuncExpr:
+		// Split:
+		//
+		//   func(arg1, ..., argN) modifiers
+		//
+		// into:
+		//
+		//   func(
+		//     arg1,
+		//     ...
+		//     argN
+		//   ) modifiers
+		dst = appendIndent(dst, indent)
+		dst = appendEscapedIdent(dst, t.Name)
+		dst = appendPrettifiedFuncArgs(dst, indent, t.Args)
+		dst = t.appendModifiers(dst)
+	case *MetricExpr:
+		// Split:
+		//
+		//   metric{filters1 or ... or filtersN}
+		//
+		// into:
+		//
+		//   metric{
+		//     filters1
+		//       or
+		//     ...
+		//       or
+		//     filtersN
+		//   }
+		offset := 0
+		metricName := t.getMetricName()
+		if metricName != "" {
+			offset = 1
+		}
+		dst = appendIndent(dst, indent)
+		dst = appendEscapedIdent(dst, metricName)
+		dst = append(dst, "{\n"...)
+		lfss := t.LabelFilterss
+		for i, lfs := range lfss {
+			dst = appendPrettifiedLabelFilters(dst, indent+1, lfs[offset:])
+			dst = append(dst, '\n')
+			if i+1 < len(lfss) {
+				dst = appendIndent(dst, indent+2)
+				dst = append(dst, "or\n"...)
+			}
+		}
+		dst = appendIndent(dst, indent)
+		dst = append(dst, '}')
+	default:
+		// marshal other expressions as is
+		dst = t.AppendString(dst)
+	}
+	if needParens {
+		indent--
+		dst = append(dst, '\n')
+		dst = appendIndent(dst, indent)
+		dst = append(dst, ')')
+	}
+	return dst
+}
+
+func appendPrettifiedFuncArgs(dst []byte, indent int, args []Expr) []byte {
+	dst = append(dst, "(\n"...)
+	for i, arg := range args {
+		dst = appendPrettifiedExpr(dst, arg, indent+1, false)
+		if i+1 < len(args) {
+			dst = append(dst, ',')
+		}
+		dst = append(dst, '\n')
+	}
+	dst = appendIndent(dst, indent)
+	dst = append(dst, ')')
+	return dst
+}
+
+func appendPrettifiedLabelFilters(dst []byte, indent int, lfs []LabelFilter) []byte {
+	dstLen := len(dst)
+
+	// Try marshaling lfs into a single line
+	dst = appendIndent(dst, indent)
+	dst = appendLabelFilters(dst, lfs)
+	if len(dst)-dstLen <= maxPrettifiedLineLen {
+		return dst
+	}
+
+	// Too long line - split it into multiple lines
+	dst = dst[:dstLen]
+	for i := range lfs {
+		dst = appendIndent(dst, indent)
+		dst = lfs[i].AppendString(dst)
+		if i+1 < len(lfs) {
+			dst = append(dst, ",\n"...)
+		}
+	}
+	return dst
+}
+
+func appendIndent(dst []byte, indent int) []byte {
+	for i := 0; i < indent; i++ {
+		dst = append(dst, "  "...)
+	}
+	return dst
+}
diff --git a/prettifier_test.go b/prettifier_test.go
new file mode 100644
index 0000000..395361b
--- /dev/null
+++ b/prettifier_test.go
@@ -0,0 +1,146 @@
+package metricsql
+
+import (
+	"testing"
+)
+
+func TestPrettifyError(t *testing.T) {
+	f := func(s string) {
+		t.Helper()
+
+		result, err := Prettify(s)
+		if err == nil {
+			t.Fatalf("expecting non-nil error")
+		}
+		if result != "" {
+			t.Fatalf("expecting empty result; got %q", result)
+		}
+	}
+
+	f(`foo{`)
+	f(`invalid query`)
+}
+
+func TestPrettifySuccess(t *testing.T) {
+	another := func(s, resultExpected string) {
+		t.Helper()
+
+		result, err := Prettify(s)
+		if err != nil {
+			t.Fatalf("unexpected error when parsing %q: %s", s, err)
+		}
+		if result != resultExpected {
+			t.Fatalf("unexpected query after prettifying;\ngot\n%s\nwant\n%s", result, resultExpected)
+		}
+
+		// Verify that the result is successfully parsed and prettified into the same string
+		if _, err := Parse(result); err != nil {
+			t.Fatalf("unexpected error when parsing prettified result: %s", err)
+		}
+		result2, err := Prettify(result)
+		if err != nil {
+			t.Fatalf("unexpected error when parsing prettified %q: %s", s, err)
+		}
+		if result2 != result {
+			t.Fatalf("unexpected result after prettifying already prettified result;\ngot\n%s\nwant\n%s", result2, result)
+		}
+	}
+	same := func(s string) {
+		t.Helper()
+		another(s, s)
+	}
+
+	// Verify that short queries remain single-line
+	same(`foo`)
+	same(`foo{bar="baz"}`)
+	same(`foo{bar="baz",x="y" or q="w",r="t"}`)
+	same(`foo{bar="baz"} + rate(x{y="x"}[5m] offset 1h)`)
+
+	// Verify that long label filters are split into multiple lines
+	another(`process_cpu_seconds_total{foo="bar",xjljljlkjopiwererrewre="asdfdsfdsfsdfdsfjkljlk"}`,
+		`process_cpu_seconds_total{
+  foo="bar",xjljljlkjopiwererrewre="asdfdsfdsfsdfdsfjkljlk"
+}`)
+	another(`process_cpu_seconds_total{foo="bar",xjljljlkjopiwererrewre="asdfdsfdsfsdfdsfjkljlk",very_long_label_aaaaaaaaaaaaaaa="fdsfdsffdsfs"}`,
+		`process_cpu_seconds_total{
+  foo="bar",
+  xjljljlkjopiwererrewre="asdfdsfdsfsdfdsfjkljlk",
+  very_long_label_aaaaaaaaaaaaaaa="fdsfdsffdsfs"
+}`)
+	another(`{foo="bar",xjljljlkjopiwererrewre="asdfdsfdsfsdfdsfjkljlk",very_long_label_aaaaaaaaaaaaaaa="fdsfdsffdsfs"}`,
+		`{
+  foo="bar",
+  xjljljlkjopiwererrewre="asdfdsfdsfsdfdsfjkljlk",
+  very_long_label_aaaaaaaaaaaaaaa="fdsfdsffdsfs"
+}`)
+	another(`process_cpu_seconds_total{instance="foobar-baz",job="job1234567" or instance="lkjlkjlkjlkjlkjlkjlkjlkjlkjlk",job="lkjljlkjalkadsfdsffdsfdsfd",
+		some_very_long_label="very_very_very_long_value_12397787_dfdfdfsds_dsffdfsf"}`,
+		`process_cpu_seconds_total{
+  instance="foobar-baz",job="job1234567"
+    or
+  instance="lkjlkjlkjlkjlkjlkjlkjlkjlkjlk",
+  job="lkjljlkjalkadsfdsffdsfdsfd",
+  some_very_long_label="very_very_very_long_value_12397787_dfdfdfsds_dsffdfsf"
+}`)
+
+	// Verify that long binary operations are split into multiple lines
+	another(`(sum(rate(process_cpu_seconds_total{instance="foo",job="bar"}[5m] offset 1h @ start())) by (x) / on(x) group_right(y) prefix "x" sum(rate(node_cpu_seconds_total{mode!="idle"}[5m]) keep_metric_names)) keep_metric_names`,
+		`(
+  sum(
+    rate(
+      process_cpu_seconds_total{instance="foo",job="bar"}[5m] offset 1h @ start()
+    )
+  ) by(x)
+    / on(x) group_right(y) prefix "x"
+  sum(rate(node_cpu_seconds_total{mode!="idle"}[5m]) keep_metric_names)
+) keep_metric_names`)
+
+	another(`process_cpu_seconds_total{aaaaaaaaaaaaaaaaaa="bbbbbb"} offset 5m + (rate(xxxxxxxxxxxxxxxx{yyyyyyyy="aaaaaaa"}) keep_metric_names)`,
+		`(process_cpu_seconds_total{aaaaaaaaaaaaaaaaaa="bbbbbb"} offset 5m)
+  +
+(rate(xxxxxxxxxxxxxxxx{yyyyyyyy="aaaaaaa"}) keep_metric_names)`)
+	another(`process_cpu_seconds_total{aaaaaaaaaaaaaaaaaa="bbbbbb",cccccccccccccccccccccc!~"ddddddddddddddddddddddd"} offset 5m + (rate(xxxxxxxxxxxxxxxx{yyyyyyyy="aaaaaaa"}) keep_metric_names)`,
+		`(
+  process_cpu_seconds_total{
+    aaaaaaaaaaaaaaaaaa="bbbbbb",
+    cccccccccccccccccccccc!~"ddddddddddddddddddddddd"
+  } offset 5m
+)
+  +
+(rate(xxxxxxxxxxxxxxxx{yyyyyyyy="aaaaaaa"}) keep_metric_names)`)
+
+	// Verify that long rollup expression is properly split into multiple lines
+	another(`process_cpu_seconds_total{foo="bar",aaaaaaaaaaaaaaaaaaaaaaaa="bbbbbbbbbbbbbbbbbbbb",c="dddddddddddd"}[5m:3s] offset 5h3m @ 12345`,
+		`process_cpu_seconds_total{
+  foo="bar",aaaaaaaaaaaaaaaaaaaaaaaa="bbbbbbbbbbbbbbbbbbbb",c="dddddddddddd"
+}[5m:3s] offset 5h3m @ 12345`)
+	another(`process_cpu_seconds_total{foo="bar",aaaaaaaaaaaaaaaaaaaaaaaa="bbbbbbbbbbbbbbbbbbbb",ccccccccccccccc="dddddddddddd"}[5m:3s] offset 5h3m @ 12345`,
+		`process_cpu_seconds_total{
+  foo="bar",
+  aaaaaaaaaaaaaaaaaaaaaaaa="bbbbbbbbbbbbbbbbbbbb",
+  ccccccccccccccc="dddddddddddd"
+}[5m:3s] offset 5h3m @ 12345`)
+
+	// Verify that aggregate expression is properly split into multiple lines
+	another(`sum without(x,y) (process_cpu_seconds_total{foo="bar",aaaaaaaaaaaaaaaaaaaaaaaa="bbbbbbbbbbbbbbbbbbbb",c="dddddddddddd"}[5m:3s] offset 5h3m @ 12345)`,
+		`sum(
+  process_cpu_seconds_total{
+    foo="bar",aaaaaaaaaaaaaaaaaaaaaaaa="bbbbbbbbbbbbbbbbbbbb",c="dddddddddddd"
+  }[5m:3s] offset 5h3m @ 12345
+) without(x,y)`)
+
+	// Verify that an ordinary function args are split into multiple lines
+	another(`clamp_min(process_cpu_seconds_total{aaaaaaaaaaaaaaaaaaaaaaaaa="bbbb",cccccc="dddd",ppppppppppppppppppppppppp=~"xxxxxxx"}, 123, "456")`,
+		`clamp_min(
+  process_cpu_seconds_total{
+    aaaaaaaaaaaaaaaaaaaaaaaaa="bbbb",
+    cccccc="dddd",
+    ppppppppppppppppppppppppp=~"xxxxxxx"
+  },
+  123,
+  "456"
+)`)
+
+	// Verify how prettifier works with very long string
+	same(`"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"`)
+}