Merge branch 'main' into enhance_iterators

expr-context.go

@@ -14,8 +14,15 @@ type ExprContext interface {
 	GetLast() any
 	SetVar(varName string, value any)
 	UnsafeSetVar(varName string, value any)
+
 	EnumVars(func(name string) (accept bool)) (varNames []string)
+	VarCount() int
+	DeleteVar(varName string)
+
 	EnumFuncs(func(name string) (accept bool)) (funcNames []string)
+	FuncCount() int
+	DeleteFunc(funcName string)
+
 	GetFuncInfo(name string) (item ExprFunc, exists bool)
 	Call(name string, args []any) (result any, err error)
 	RegisterFuncInfo(info ExprFunc)

operator-include.go

@@ -25,8 +25,8 @@ func evalInclude(ctx ExprContext, opTerm *term) (v any, err error) {
 
 	count := 0
 	if IsList(childValue) {
-		list, _ := childValue.([]any)
-		for i, filePathSpec := range list {
+		list, _ := childValue.(*ListType)
+		for i, filePathSpec := range *list {
 			if filePath, ok := filePathSpec.(string); ok {
 				if v, err = EvalFile(ctx, filePath); err == nil {
 					count++
@@ -47,8 +47,9 @@ func evalInclude(ctx ExprContext, opTerm *term) (v any, err error) {
 	} else {
 		err = opTerm.errIncompatibleType(childValue)
 	}
-	if err == nil {
-		v = count
+	if err != nil {
+		//v = count
+		v = nil
 	}
 	return
 }

operator-unset.go

@@ -0,0 +1,69 @@
+// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
+// All rights reserved.
+
+// operator-unset.go
+package expr
+
+import "strings"
+
+//-------- unset term
+
+func newUnsetTerm(tk *Token) (inst *term) {
+	return &term{
+		tk:       *tk,
+		children: make([]*term, 0, 1),
+		position: posPrefix,
+		priority: priSign,
+		evalFunc: evalUnset,
+	}
+}
+
+func deleteContextItem(ctx ExprContext, opTerm *term, item any) (deleted bool, err error) {
+	if name, ok := item.(string); ok {
+		var size int
+		if strings.HasSuffix(name, "()") {
+			size = ctx.FuncCount()
+			ctx.DeleteFunc(strings.TrimRight(name, "()"))
+			deleted = ctx.FuncCount() < size
+		} else {
+			size = ctx.VarCount()
+			ctx.DeleteVar(name)
+			deleted = ctx.VarCount() < size
+		}
+	} else {
+		err = opTerm.errIncompatibleType(item)
+	}
+	return
+}
+
+func evalUnset(ctx ExprContext, opTerm *term) (v any, err error) {
+	var childValue any
+	var deleted bool
+
+	if childValue, err = opTerm.evalPrefix(ctx); err != nil {
+		return
+	}
+
+	count := 0
+	if IsList(childValue) {
+		list, _ := childValue.(*ListType)
+		for _, item := range *list {
+			if deleted, err = deleteContextItem(ctx, opTerm, item); err != nil {
+				break
+			} else if deleted {
+				count++
+			}
+		}
+	} else if deleted, err = deleteContextItem(ctx, opTerm, childValue); err == nil && deleted {
+		count++
+	}
+	if err == nil {
+		v = int64(count)
+	}
+	return
+}
+
+// init
+func init() {
+	registerTermConstructor(SymKwUnset, newUnsetTerm)
+}

simple-store.go

@@ -132,6 +132,14 @@ func (ctx *SimpleStore) EnumVars(acceptor func(name string) (accept bool)) (varN
 	return
 }
 
+func (ctx *SimpleStore) VarCount() int {
+	return len(ctx.varStore)
+}
+
+func (ctx *SimpleStore) DeleteVar(varName string) {
+	delete(ctx.varStore, varName)
+}
+
 func (ctx *SimpleStore) GetFuncInfo(name string) (info ExprFunc, exists bool) {
 	info, exists = ctx.funcStore[name]
 	return
@@ -163,6 +171,14 @@ func (ctx *SimpleStore) EnumFuncs(acceptor func(name string) (accept bool)) (fun
 	return
 }
 
+func (ctx *SimpleStore) FuncCount() int {
+	return len(ctx.funcStore)
+}
+
+func (ctx *SimpleStore) DeleteFunc(funcName string) {
+	delete(ctx.funcStore, funcName)
+}
+
 func (ctx *SimpleStore) Call(name string, args []any) (result any, err error) {
 	if info, exists := GetLocalFuncInfo(ctx, name); exists {
 		functor := info.Functor()

symbol.go

@@ -106,6 +106,7 @@ const (
 	SymKwIn
 	SymKwInclude
 	SymKwNil
+	SymKwUnset
 )
 
 var keywords map[string]Symbol
@@ -123,5 +124,6 @@ func init() {
 		"NOT":     SymKwNot,
 		"OR":      SymKwOr,
 		"NIL":     SymKwNil,
+		"UNSET":   SymKwUnset,
 	}
 }

t_operator_test.go

@@ -0,0 +1,23 @@
+// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
+// All rights reserved.
+
+// t_operator_test.go
+package expr
+
+import (
+	"testing"
+)
+
+func TestOperator(t *testing.T) {
+	section := "Operator"
+	inputs := []inputType{
+		/*   1 */ {`a=1; unset "a"; a`, nil, `undefined variable or function "a"`},
+		/*   2 */ {`a=1; unset ["a", "b"]`, int64(1), nil},
+		/*   3 */ {`f=func(){3}; unset "f()"`, int64(1), nil},
+	}
+
+	// t.Setenv("EXPR_PATH", ".")
+
+	//runTestSuiteSpec(t, section, inputs, 3)
+	runTestSuite(t, section, inputs)
+}