Make expr.Eval faster (expr-lang#775)

* Make expr.Eval faster

* Add bench_call_test.go

* Make parser config optional

Author: antonmedv

bench_test.go

@@ -31,6 +31,26 @@ func Benchmark_expr(b *testing.B) {
 	require.True(b, out.(bool))
 }
 
+func Benchmark_expr_eval(b *testing.B) {
+	params := make(map[string]any)
+	params["Origin"] = "MOW"
+	params["Country"] = "RU"
+	params["Adults"] = 1
+	params["Value"] = 100
+
+	var out any
+	var err error
+
+	b.ResetTimer()
+	for n := 0; n < b.N; n++ {
+		out, err = expr.Eval(`(Origin == "MOW" || Country == "RU") && (Value >= 100 || Adults == 1)`, params)
+	}
+	b.StopTimer()
+
+	require.NoError(b, err)
+	require.True(b, out.(bool))
+}
+
 func Benchmark_expr_reuseVm(b *testing.B) {
 	params := make(map[string]any)
 	params["Origin"] = "MOW"

builtin/builtin_test.go

@@ -246,9 +246,15 @@ func TestBuiltin_errors(t *testing.T) {
 	}
 	for _, test := range errorTests {
 		t.Run(test.input, func(t *testing.T) {
-			_, err := expr.Eval(test.input, nil)
-			assert.Error(t, err)
-			assert.Contains(t, err.Error(), test.err)
+			program, err := expr.Compile(test.input)
+			if err != nil {
+				assert.Error(t, err)
+				assert.Contains(t, err.Error(), test.err)
+			} else {
+				_, err = expr.Run(program, nil)
+				assert.Error(t, err)
+				assert.Contains(t, err.Error(), test.err)
+			}
 		})
 	}
 }

compiler/compiler.go

@@ -776,12 +776,16 @@ func (c *compiler) CallNode(node *ast.CallNode) {
 	}
 	c.compile(node.Callee)
 
-	isMethod, _, _ := checker.MethodIndex(c.config.Env, node.Callee)
-	if index, ok := checker.TypedFuncIndex(node.Callee.Type(), isMethod); ok {
-		c.emit(OpCallTyped, index)
-		return
-	} else if checker.IsFastFunc(node.Callee.Type(), isMethod) {
-		c.emit(OpCallFast, len(node.Arguments))
+	if c.config != nil {
+		isMethod, _, _ := checker.MethodIndex(c.config.Env, node.Callee)
+		if index, ok := checker.TypedFuncIndex(node.Callee.Type(), isMethod); ok {
+			c.emit(OpCallTyped, index)
+			return
+		} else if checker.IsFastFunc(node.Callee.Type(), isMethod) {
+			c.emit(OpCallFast, len(node.Arguments))
+		} else {
+			c.emit(OpCall, len(node.Arguments))
+		}
 	} else {
 		c.emit(OpCall, len(node.Arguments))
 	}

expr.go

@@ -13,6 +13,7 @@ import (
 	"github.com/expr-lang/expr/conf"
 	"github.com/expr-lang/expr/file"
 	"github.com/expr-lang/expr/optimizer"
+	"github.com/expr-lang/expr/parser"
 	"github.com/expr-lang/expr/patcher"
 	"github.com/expr-lang/expr/vm"
 )
@@ -240,7 +241,12 @@ func Eval(input string, env any) (any, error) {
 		return nil, fmt.Errorf("misused expr.Eval: second argument (env) should be passed without expr.Env")
 	}
 
-	program, err := Compile(input)
+	tree, err := parser.Parse(input)
+	if err != nil {
+		return nil, err
+	}
+
+	program, err := compiler.Compile(tree, nil)
 	if err != nil {
 		return nil, err
 	}

expr_test.go

@@ -1684,7 +1684,7 @@ func TestEval_exposed_error(t *testing.T) {
 
 	fileError, ok := err.(*file.Error)
 	require.True(t, ok, "error should be of type *file.Error")
-	require.Equal(t, "integer divide by zero (1:3)\n | 1 % 0\n | ..^", fileError.Error())
+	require.Equal(t, "runtime error: integer divide by zero (1:3)\n | 1 % 0\n | ..^", fileError.Error())
 	require.Equal(t, 2, fileError.Column)
 	require.Equal(t, 1, fileError.Line)
 }

parser/lexer/lexer_test.go

@@ -311,13 +311,13 @@ func TestLex_location(t *testing.T) {
 	tokens, err := Lex(source)
 	require.NoError(t, err)
 	require.Equal(t, []Token{
-		{Location: file.Location{From: 0, To: 1}, Kind: "Number", Value: "1"},
-		{Location: file.Location{From: 1, To: 3}, Kind: "Operator", Value: ".."},
-		{Location: file.Location{From: 3, To: 4}, Kind: "Number", Value: "2"},
-		{Location: file.Location{From: 5, To: 6}, Kind: "Number", Value: "3"},
-		{Location: file.Location{From: 6, To: 8}, Kind: "Operator", Value: ".."},
-		{Location: file.Location{From: 8, To: 9}, Kind: "Number", Value: "4"},
-		{Location: file.Location{From: 8, To: 9}, Kind: "EOF", Value: ""},
+		{Location: file.Location{From: 0, To: 1}, Kind: Number, Value: "1"},
+		{Location: file.Location{From: 1, To: 3}, Kind: Operator, Value: ".."},
+		{Location: file.Location{From: 3, To: 4}, Kind: Number, Value: "2"},
+		{Location: file.Location{From: 5, To: 6}, Kind: Number, Value: "3"},
+		{Location: file.Location{From: 6, To: 8}, Kind: Operator, Value: ".."},
+		{Location: file.Location{From: 8, To: 9}, Kind: Number, Value: "4"},
+		{Location: file.Location{From: 8, To: 9}, Kind: EOF, Value: ""},
 	}, tokens)
 }
 

parser/parser.go

@@ -56,6 +56,13 @@ type parser struct {
 
 func (p *parser) checkNodeLimit() error {
 	p.nodeCount++
+	if p.config == nil {
+		if p.nodeCount > conf.DefaultMaxNodes {
+			p.error("compilation failed: expression exceeds maximum allowed nodes")
+			return nil
+		}
+		return nil
+	}
 	if p.config.MaxNodes > 0 && p.nodeCount > p.config.MaxNodes {
 		p.error("compilation failed: expression exceeds maximum allowed nodes")
 		return nil
@@ -91,9 +98,7 @@ type Tree struct {
 }
 
 func Parse(input string) (*Tree, error) {
-	return ParseWithConfig(input, &conf.Config{
-		Disabled: map[string]bool{},
-	})
+	return ParseWithConfig(input, nil)
 }
 
 func ParseWithConfig(input string, config *conf.Config) (*Tree, error) {
@@ -515,7 +520,10 @@ func (p *parser) toFloatNode(number float64) Node {
 func (p *parser) parseCall(token Token, arguments []Node, checkOverrides bool) Node {
 	var node Node
 
-	isOverridden := p.config.IsOverridden(token.Value)
+	isOverridden := false
+	if p.config != nil {
+		isOverridden = p.config.IsOverridden(token.Value)
+	}
 	isOverridden = isOverridden && checkOverrides
 
 	if b, ok := predicates[token.Value]; ok && !isOverridden {
@@ -562,7 +570,7 @@ func (p *parser) parseCall(token Token, arguments []Node, checkOverrides bool) N
 		if node == nil {
 			return nil
 		}
-	} else if _, ok := builtin.Index[token.Value]; ok && !p.config.Disabled[token.Value] && !isOverridden {
+	} else if _, ok := builtin.Index[token.Value]; ok && (p.config == nil || !p.config.Disabled[token.Value]) && !isOverridden {
 		node = p.createNode(&BuiltinNode{
 			Name:      token.Value,
 			Arguments: p.parseArguments(arguments),

test/bench/bench_call_test.go

@@ -0,0 +1,63 @@
+package bench_test
+
+import (
+	"testing"
+
+	"github.com/expr-lang/expr"
+	"github.com/expr-lang/expr/internal/testify/require"
+	"github.com/expr-lang/expr/vm"
+)
+
+type Env struct {
+	Fn func() bool
+}
+
+func BenchmarkCall_callTyped(b *testing.B) {
+	code := `Fn()`
+
+	p, err := expr.Compile(code, expr.Env(Env{}))
+	require.NoError(b, err)
+	require.Equal(b, p.Bytecode[1], vm.OpCallTyped)
+
+	env := Env{
+		Fn: func() bool {
+			return true
+		},
+	}
+
+	var out any
+
+	b.ResetTimer()
+	for n := 0; n < b.N; n++ {
+		program, _ := expr.Compile(code, expr.Env(env))
+		out, err = vm.Run(program, env)
+	}
+	b.StopTimer()
+
+	require.NoError(b, err)
+	require.True(b, out.(bool))
+}
+
+func BenchmarkCall_eval(b *testing.B) {
+	code := `Fn()`
+
+	p, err := expr.Compile(code)
+	require.NoError(b, err)
+	require.Equal(b, p.Bytecode[1], vm.OpCall)
+
+	env := Env{
+		Fn: func() bool {
+			return true
+		},
+	}
+
+	var out any
+	b.ResetTimer()
+	for n := 0; n < b.N; n++ {
+		out, err = expr.Eval(code, env)
+	}
+	b.StopTimer()
+
+	require.NoError(b, err)
+	require.True(b, out.(bool))
+}