Merge pull request #515 from dorian3343/main

Added list length component

e2e/run_examples_test.go

@@ -50,3 +50,23 @@ func TestEcho(t *testing.T) {
 
 	require.Equal(t, 0, cmd.ProcessState.ExitCode())
 }
+
+func TestLength(t *testing.T) {
+	err := os.Chdir("../examples")
+	require.NoError(t, err)
+
+	defer os.Chdir(wd)
+
+	cmd := exec.Command("neva", "run", "13_list_length")
+
+	out, err := cmd.CombinedOutput()
+	require.NoError(t, err)
+
+	require.Equal(
+		t,
+		"5\n",
+		string(out),
+	)
+
+	require.Equal(t, 0, cmd.ProcessState.ExitCode())
+}

examples/13_list_length/main.neva

@@ -0,0 +1,12 @@
+const n list<int> = [4,123,22,1121,215]
+component Main(start any) (stop any) {
+	nodes {
+	    printer Printer<any>
+	    len Len<list<int>>
+	}
+	net {
+		:start -> ($n -> len:data)
+	    len:res -> printer:data
+		printer:sig -> :stop
+	}
+}

internal/runtime/funcs/length.go

@@ -0,0 +1,35 @@
+package funcs
+
+import (
+	"context"
+	"github.com/nevalang/neva/internal/runtime"
+)
+
+type listlen struct{}
+
+func (p listlen) Create(io runtime.FuncIO, _ runtime.Msg) (func(ctx context.Context), error) {
+	dataIn, err := io.In.Port("data")
+	if err != nil {
+		return nil, err
+	}
+
+	resOut, err := io.Out.Port("res")
+	if err != nil {
+		return nil, err
+	}
+
+	return func(ctx context.Context) {
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case data := <-dataIn:
+				select {
+				case <-ctx.Done():
+					return
+				case resOut <- runtime.NewIntMsg(int64(len(data.List()))):
+				}
+			}
+		}
+	}, nil
+}

internal/runtime/funcs/registry.go

@@ -19,9 +19,9 @@ func CreatorRegistry() map[string]runtime.FuncCreator {
 		// logic
 		"int_eq": intEq{},
 		// math
-		"int_adder":      intAdder{},
-		"int_subtractor": intSubtractor{},
-		"int_multiplier": intMultiplier{},
+		"int_adder":       intAdder{},
+		"int_subtractor":  intSubtractor{},
+		"int_multiplier":  intMultiplier{},
 		"int_decrementor": intDecrementor{},
 		// io
 		"line_scanner":  lineScanner{},
@@ -31,5 +31,7 @@ func CreatorRegistry() map[string]runtime.FuncCreator {
 		"int_parser": intParser{},
 		// regexp
 		"regexp_submatcher": regexpSubmatcher{},
+		//list
+		"list_len": listlen{},
 	}
 }

std/builtin/base.neva

@@ -49,4 +49,11 @@ type EqElse<T any> struct {
 }
 
 #extern(int int_eq, float float_eq, string string_eq)
-pub component Eq<T int |float | string>(a T, b T) (then T, else EqElse<T>)
+pub component Eq<T int |float | string>(a T, b T) (then T, else EqElse<T>)
+
+// List / Map operations
+#extern(list list_len, map map_len)
+pub component Len<T list<any> | map<any>>(data T) (res int)
+
+
+