t_parser_test.go: more tests on ??, ?= and ?! operators

t_parser_test.go: changed all error values to string values
the common test framework now supports error, string and nil as value of the wantErr field
2024-07-06 17:01:23 +02:00 · 2024-07-06 16:47:00 +02:00 · 2024-07-06 16:43:13 +02:00 · 2024-07-06 16:08:58 +02:00 · 2024-07-06 16:05:54 +02:00 · 2024-07-06 05:54:53 +02:00
23 changed files with 269 additions and 211 deletions
--- a/common-errors.go
+++ b/common-errors.go
@ -53,3 +53,9 @@ func ErrInvalidParameterValue(funcName, paramName string, paramValue any) error
 func ErrWrongParamType(funcName, paramName, paramType string, paramValue any) error {
 	return fmt.Errorf("%s(): the %q parameter must be a %s, got a %s (%v)", funcName, paramName, paramType, TypeName(paramValue), paramValue)
 }
+
+// --- Operator errors
+
+func ErrLeftOperandMustBeVariable(leftTerm, opTerm *term) error {
+	return leftTerm.Errorf("left operand of %q must be a variable", opTerm.source())
+}
--- a/data-cursor.go
+++ b/data-cursor.go
@ -29,6 +29,10 @@ func newDataCursor(ctx ExprContext, ds map[string]Functor) (dc *dataCursor) {
 	return
 }

+func (dc *dataCursor) TypeName() string {
+	return "DataCursor"
+}
+
 // func mapToString(m map[string]Functor) string {
 // 	var sb strings.Builder
 // 	sb.WriteByte('{')
--- a/iter-list.go
+++ b/iter-list.go
@ -85,6 +85,10 @@ func (it *ListIterator) String() string {
 	return fmt.Sprintf("$(#%d)", l)
 }

+func (it *ListIterator) TypeName() string {
+	return "ListIterator"
+}
+
 func (it *ListIterator) HasOperation(name string) bool {
 	yes := name == resetName || name == indexName || name == countName
 	return yes
--- a/iterator.go
+++ b/iterator.go
@ -22,6 +22,7 @@ const (
 )

 type Iterator interface {
+	Typer
 	Next() (item any, err error) // must return io.EOF after the last item
 	Current() (item any, err error)
 	Index() int
--- a/operator-coalesce.go
+++ b/operator-coalesce.go
@ -1,85 +0,0 @@
-// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
-// All rights reserved.
-
-// operator-coalesce.go
-package expr
-
-//-------- null coalesce term
-
-func newNullCoalesceTerm(tk *Token) (inst *term) {
-	return &term{
-		tk:       *tk,
-		children: make([]*term, 0, 2),
-		position: posInfix,
-		priority: priCoalesce,
-		evalFunc: evalNullCoalesce,
-	}
-}
-
-func evalNullCoalesce(ctx ExprContext, self *term) (v any, err error) {
-	var rightValue any
-
-	if err = self.checkOperands(); err != nil {
-		return
-	}
-
-	leftTerm := self.children[0]
-	if leftTerm.tk.Sym != SymVariable {
-		err = leftTerm.Errorf("left operand of %q must be a variable", self.tk.source)
-		return
-	}
-
-	if leftValue, exists := ctx.GetVar(leftTerm.source()); exists {
-		v = leftValue
-	} else if rightValue, err = self.children[1].compute(ctx); err == nil {
-		v = rightValue
-	}
-	return
-}
-
-//-------- coalesce assign term
-
-func newCoalesceAssignTerm(tk *Token) (inst *term) {
-	return &term{
-		tk:       *tk,
-		children: make([]*term, 0, 2),
-		position: posInfix,
-		priority: priCoalesce,
-		evalFunc: evalAssignCoalesce,
-	}
-}
-
-func evalAssignCoalesce(ctx ExprContext, self *term) (v any, err error) {
-	var rightValue any
-
-	if err = self.checkOperands(); err != nil {
-		return
-	}
-
-	leftTerm := self.children[0]
-	if leftTerm.tk.Sym != SymVariable {
-		err = leftTerm.Errorf("left operand of %q must be a variable", self.tk.source)
-		return
-	}
-
-	if leftValue, exists := ctx.GetVar(leftTerm.source()); exists {
-		v = leftValue
-	} else if rightValue, err = self.children[1].compute(ctx); err == nil {
-		if functor, ok := rightValue.(Functor); ok {
-			//ctx.RegisterFunc(leftTerm.source(), functor, 0, -1)
-			ctx.RegisterFunc(leftTerm.source(), functor, TypeAny, []ExprFuncParam{
-				NewFuncParamFlag(ParamValue, PfDefault|PfRepeat),
-			})
-		} else {
-			v = rightValue
-			ctx.UnsafeSetVar(leftTerm.source(), rightValue)
-		}
-	}
-	return
-}
-
-// init
-func init() {
-	registerTermConstructor(SymDoubleQuestion, newNullCoalesceTerm)
-	registerTermConstructor(SymQuestionEqual, newCoalesceAssignTerm)
-}
--- a/operator-default.go
+++ b/operator-default.go
@ -0,0 +1,124 @@
+// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
+// All rights reserved.
+
+// operator-default.go
+package expr
+
+//-------- default term
+
+func newDefaultTerm(tk *Token) (inst *term) {
+	return &term{
+		tk:       *tk,
+		children: make([]*term, 0, 2),
+		position: posInfix,
+		priority: priCoalesce,
+		evalFunc: evalDefault,
+	}
+}
+
+func evalDefault(ctx ExprContext, self *term) (v any, err error) {
+	var rightValue any
+
+	if err = self.checkOperands(); err != nil {
+		return
+	}
+
+	leftTerm := self.children[0]
+	if leftTerm.tk.Sym != SymVariable {
+		// err = leftTerm.Errorf("left operand of %q must be a variable", self.tk.source)
+		err = ErrLeftOperandMustBeVariable(leftTerm, self)
+		return
+	}
+
+	if leftValue, exists := ctx.GetVar(leftTerm.source()); exists {
+		v = leftValue
+	} else if rightValue, err = self.children[1].compute(ctx); err == nil {
+		v = rightValue
+	}
+	return
+}
+
+//-------- alternate term
+
+func newAlternateTerm(tk *Token) (inst *term) {
+	return &term{
+		tk:       *tk,
+		children: make([]*term, 0, 2),
+		position: posInfix,
+		priority: priCoalesce,
+		evalFunc: evalAlternate,
+	}
+}
+
+func evalAlternate(ctx ExprContext, self *term) (v any, err error) {
+	var rightValue any
+
+	if err = self.checkOperands(); err != nil {
+		return
+	}
+
+	leftTerm := self.children[0]
+	if leftTerm.tk.Sym != SymVariable {
+		// err = leftTerm.Errorf("left operand of %q must be a variable", self.tk.source)
+		err = ErrLeftOperandMustBeVariable(leftTerm, self)
+		return
+	}
+
+	if leftValue, exists := ctx.GetVar(leftTerm.source()); exists && leftValue != nil {
+		if rightValue, err = self.children[1].compute(ctx); err == nil {
+			v = rightValue
+		}
+	} else {
+		v = leftValue
+	}
+	return
+}
+
+//-------- default assign term
+
+func newDefaultAssignTerm(tk *Token) (inst *term) {
+	return &term{
+		tk:       *tk,
+		children: make([]*term, 0, 2),
+		position: posInfix,
+		priority: priCoalesce,
+		evalFunc: evalAssignDefault,
+	}
+}
+
+func evalAssignDefault(ctx ExprContext, self *term) (v any, err error) {
+	var rightValue any
+
+	if err = self.checkOperands(); err != nil {
+		return
+	}
+
+	leftTerm := self.children[0]
+	if leftTerm.tk.Sym != SymVariable {
+		// err = leftTerm.Errorf("left operand of %q must be a variable", self.tk.source)
+		err = ErrLeftOperandMustBeVariable(leftTerm, self)
+		return
+	}
+
+	if leftValue, exists := ctx.GetVar(leftTerm.source()); exists {
+		v = leftValue
+	} else if rightValue, err = self.children[1].compute(ctx); err == nil {
+		if functor, ok := rightValue.(Functor); ok {
+			//ctx.RegisterFunc(leftTerm.source(), functor, 0, -1)
+			ctx.RegisterFunc(leftTerm.source(), functor, TypeAny, []ExprFuncParam{
+				NewFuncParamFlag(ParamValue, PfDefault|PfRepeat),
+			})
+		} else {
+			v = rightValue
+			ctx.UnsafeSetVar(leftTerm.source(), rightValue)
+		}
+	}
+	return
+}
+
+// init
+func init() {
+	registerTermConstructor(SymDoubleQuestion, newDefaultTerm)
+	registerTermConstructor(SymQuestionEqual, newDefaultAssignTerm)
+	registerTermConstructor(SymQuestionExclam, newAlternateTerm)
+}
--- a/operator-include.go
+++ b/operator-include.go
@ -41,7 +41,9 @@ func evalInclude(ctx ExprContext, self *term) (v any, err error) {
 		}
 	} else if IsString(childValue) {
 		filePath, _ := childValue.(string)
-		v, err = EvalFile(ctx, filePath)
+		if v, err = EvalFile(ctx, filePath); err == nil {
+			count++
+		}
 	} else {
 		err = self.errIncompatibleType(childValue)
 	}
--- a/scanner.go
+++ b/scanner.go
@ -202,8 +202,10 @@ func (self *scanner) fetchNextToken() (tk *Token) {
 		case '?':
 			if next, _ := self.peek(); next == '?' {
 				tk = self.moveOn(SymDoubleQuestion, ch, next)
-			} else if next, _ := self.peek(); next == '=' {
+			} else if next == '=' {
 				tk = self.moveOn(SymQuestionEqual, ch, next)
+			} else if next == '!' {
+				tk = self.moveOn(SymQuestionExclam, ch, next)
 			} else {
 				tk = self.makeToken(SymQuestion, ch)
 			}
--- a/symbol.go
+++ b/symbol.go
@ -57,16 +57,17 @@ const (
 	SymTilde                             //  46: '~'
 	SymDoubleQuestion                    //  47: '??'
 	SymQuestionEqual                     //  48: '?='
-	SymDoubleAt                          //  49: '@@'
-	SymDoubleColon                       //  50: '::'
-	SymInsert                            //  51: '>>'
-	SymAppend                            //  52: '<<'
-	SymCaret                             //  53: '^'
-	SymDollarRound                       //  54: '$('
-	SymOpenClosedRound                   //  55: '()'
-	SymDoubleDollar                      //  56: '$$'
-	SymDoubleDot                         //  57: '..'
-	SymTripleDot                         //  58: '...'
+	SymQuestionExclam                    //  49: '?!'
+	SymDoubleAt                          //  50: '@@'
+	SymDoubleColon                       //  51: '::'
+	SymInsert                            //  52: '>>'
+	SymAppend                            //  53: '<<'
+	SymCaret                             //  54: '^'
+	SymDollarRound                       //  55: '$('
+	SymOpenClosedRound                   //  56: '()'
+	SymDoubleDollar                      //  57: '$$'
+	SymDoubleDot                         //  58: '..'
+	SymTripleDot                         //  59: '...'
 	SymChangeSign
 	SymUnchangeSign
 	SymIdentifier
--- a/t_bool_test.go
+++ b/t_bool_test.go
@ -45,13 +45,13 @@ func TestBoolNoShortcut(t *testing.T) {
 		/*   5 */ {`not "true"`, false, nil},
 		/*   6 */ {`not "false"`, false, nil},
 		/*   7 */ {`not ""`, true, nil},
-		/*   8 */ {`not []`, nil, errors.New(`[1:4] prefix/postfix operator "NOT" do not support operand '[]' [list]`)},
+		/*   8 */ {`not []`, nil, `[1:4] prefix/postfix operator "NOT" do not support operand '[]' [list]`},
 		/*   9 */ {`true and false`, false, nil},
-		/*  10 */ {`true and []`, nil, errors.New(`[1:9] left operand 'true' [bool] and right operand '[]' [list] are not compatible with operator "AND"`)},
-		/*  11 */ {`[] and false`, nil, errors.New(`[1:7] left operand '[]' [list] and right operand 'false' [bool] are not compatible with operator "AND"`)},
+		/*  10 */ {`true and []`, nil, `[1:9] left operand 'true' [bool] and right operand '[]' [list] are not compatible with operator "AND"`},
+		/*  11 */ {`[] and false`, nil, `[1:7] left operand '[]' [list] and right operand 'false' [bool] are not compatible with operator "AND"`},
 		/*  12 */ {`true or false`, true, nil},
-		/*  13 */ {`true or []`, nil, errors.New(`[1:8] left operand 'true' [bool] and right operand '[]' [list] are not compatible with operator "OR"`)},
-		/*  14 */ {`[] or false`, nil, errors.New(`[1:6] left operand '[]' [list] and right operand 'false' [bool] are not compatible with operator "OR"`)},
+		/*  13 */ {`true or []`, nil, `[1:8] left operand 'true' [bool] and right operand '[]' [list] are not compatible with operator "OR"`},
+		/*  14 */ {`[] or false`, nil, `[1:6] left operand '[]' [list] and right operand 'false' [bool] are not compatible with operator "OR"`},
 	}

 	// t.Setenv("EXPR_PATH", ".")
--- a/t_builtin-base_test.go
+++ b/t_builtin-base_test.go
@ -5,7 +5,6 @@
 package expr

 import (
-	"errors"
 	"testing"
 )

@ -21,9 +20,9 @@ func TestFuncBase(t *testing.T) {
 		/*   6 */ {`int(3.1)`, int64(3), nil},
 		/*   7 */ {`int(3.9)`, int64(3), nil},
 		/*   8 */ {`int("432")`, int64(432), nil},
-		/*   9 */ {`int("1.5")`, nil, errors.New(`strconv.Atoi: parsing "1.5": invalid syntax`)},
-		/*  10 */ {`int("432", 4)`, nil, errors.New(`int(): too much params -- expected 1, got 2`)},
-		/*  11 */ {`int(nil)`, nil, errors.New(`int(): can't convert nil to int`)},
+		/*   9 */ {`int("1.5")`, nil, `strconv.Atoi: parsing "1.5": invalid syntax`},
+		/*  10 */ {`int("432", 4)`, nil, `int(): too much params -- expected 1, got 2`},
+		/*  11 */ {`int(nil)`, nil, `int(): can't convert nil to int`},
 		/*  12 */ {`isInt(2+1)`, true, nil},
 		/*  13 */ {`isInt(3.1)`, false, nil},
 		/*  14 */ {`isFloat(3.1)`, true, nil},
@ -42,9 +41,9 @@ func TestFuncBase(t *testing.T) {
 		/*  27 */ {`dec(2.0)`, float64(2), nil},
 		/*  28 */ {`dec("2.0")`, float64(2), nil},
 		/*  29 */ {`dec(true)`, float64(1), nil},
-		/*  30 */ {`dec(true")`, nil, errors.New("[1:11] missing string termination \"")},
-		/*  31 */ {`dec()`, nil, errors.New(`dec(): too few params -- expected 1, got 0`)},
-		/*  32 */ {`dec(1,2,3)`, nil, errors.New(`dec(): too much params -- expected 1, got 3`)},
+		/*  30 */ {`dec(true")`, nil, `[1:11] missing string termination "`},
+		/*  31 */ {`dec()`, nil, `dec(): too few params -- expected 1, got 0`},
+		/*  32 */ {`dec(1,2,3)`, nil, `dec(): too much params -- expected 1, got 3`},
 		/*  33 */ {`isBool(false)`, true, nil},
 		/*  34 */ {`fract(1|2)`, newFraction(1, 2), nil},
 		/*  35 */ {`fract(12,2)`, newFraction(6, 1), nil},
@ -53,15 +52,14 @@ func TestFuncBase(t *testing.T) {
 		/*  38 */ {`bool(1.0)`, true, nil},
 		/*  39 */ {`bool("1")`, true, nil},
 		/*  40 */ {`bool(false)`, false, nil},
-		/*  41 */ {`bool([1])`, nil, errors.New(`bool(): can't convert list to bool`)},
+		/*  41 */ {`bool([1])`, nil, `bool(): can't convert list to bool`},
 		/*  42 */ {`dec(false)`, float64(0), nil},
 		/*  43 */ {`dec(1|2)`, float64(0.5), nil},
-		/*  44 */ {`dec([1])`, nil, errors.New(`dec(): can't convert list to float`)},
-		// /*  45 */ {`string([1])`, nil, errors.New(`string(): can't convert list to string`)},
+		/*  44 */ {`dec([1])`, nil, `dec(): can't convert list to float`},
+		// /*  45 */ {`string([1])`, nil, `string(): can't convert list to string`},
 	}

 	t.Setenv("EXPR_PATH", ".")

-	// parserTestSpec(t, section, inputs, 2)
 	runTestSuite(t, section, inputs)
 }
--- a/t_builtin-fmt_test.go
+++ b/t_builtin-fmt_test.go
@ -21,7 +21,7 @@ func TestFuncFmt(t *testing.T) {

 	//t.Setenv("EXPR_PATH", ".")

-	// runTestSuiteSpec(t, section, inputs, 19)
+	// runTestSuiteSpec(t, section, inputs, 1)
 	runTestSuite(t, section, inputs)
 }

--- a/t_builtin-import_test.go
+++ b/t_builtin-import_test.go
@ -19,6 +19,6 @@ func TestFuncImport(t *testing.T) {

 	t.Setenv("EXPR_PATH", "test-resources")

-	// parserTestSpec(t, section, inputs, 69)
+	// runTestSuiteSpec(t, section, inputs, 1)
 	runTestSuite(t, section, inputs)
 }
--- a/t_builtin-math-arith_test.go
+++ b/t_builtin-math-arith_test.go
@ -5,7 +5,6 @@
 package expr

 import (
-	"errors"
 	"testing"
 )

@ -14,7 +13,7 @@ func TestFuncMathArith(t *testing.T) {
 	inputs := []inputType{
 		/*   1 */ {`builtin "math.arith"; add(1,2)`, int64(3), nil},
 		/*   2 */ {`builtin "math.arith"; add(1,2,3)`, int64(6), nil},
-		/*   3 */ {`builtin "math.arith"; mulX(1,2,3)`, nil, errors.New(`unknown function mulX()`)},
+		/*   3 */ {`builtin "math.arith"; mulX(1,2,3)`, nil, `unknown function mulX()`},
 		/*   4 */ {`builtin "math.arith"; add(1+4,3+2,5*(3-2))`, int64(15), nil},
 		/*   5 */ {`builtin "math.arith"; add(add(1+4),3+2,5*(3-2))`, int64(15), nil},
 		/*   6 */ {`builtin "math.arith"; add(add(1,4),/*3+2,*/5*(3-2))`, int64(10), nil},
@ -24,6 +23,6 @@ func TestFuncMathArith(t *testing.T) {

 	// t.Setenv("EXPR_PATH", ".")

-	// parserTestSpec(t, section, inputs, 69)
+	// runTestSuiteSpec(t, section, inputs, 1)
 	runTestSuite(t, section, inputs)
 }
--- a/t_builtin-os-file_test.go
+++ b/t_builtin-os-file_test.go
@ -5,7 +5,6 @@
 package expr

 import (
-	"errors"
 	"testing"
 )

@ -14,23 +13,23 @@ func TestFuncOs(t *testing.T) {
 	inputs := []inputType{
 		/*   1 */ {`builtin "os.file"`, int64(1), nil},
 		/*   2 */ {`builtin "os.file"; handle=fileOpen("/etc/hosts"); fileClose(handle)`, true, nil},
-		/*   3 */ {`builtin "os.file"; handle=fileOpen("/etc/hostsX")`, nil, errors.New(`open /etc/hostsX: no such file or directory`)},
+		/*   3 */ {`builtin "os.file"; handle=fileOpen("/etc/hostsX")`, nil, `open /etc/hostsX: no such file or directory`},
 		/*   4 */ {`builtin "os.file"; handle=fileCreate("/tmp/dummy"); fileClose(handle)`, true, nil},
 		/*   5 */ {`builtin "os.file"; handle=fileAppend("/tmp/dummy"); fileWriteText(handle, "bye-bye"); fileClose(handle)`, true, nil},
 		/*   6 */ {`builtin "os.file"; handle=fileOpen("/tmp/dummy"); word=fileReadText(handle, "-"); fileClose(handle);word`, "bye", nil},
-		/*   7 */ {`builtin "os.file"; word=fileReadText(nil, "-")`, nil, errors.New(`fileReadText(): invalid file handle`)},
-		/*   8 */ {`builtin "os.file"; fileWriteText(nil, "bye")`, nil, errors.New(`fileWriteText(): invalid file handle`)},
-		/*   9 */ {`builtin "os.file"; handle=fileOpen()`, nil, errors.New(`fileOpen(): too few params -- expected 1, got 0`)},
-		/*  10 */ {`builtin "os.file"; handle=fileOpen(123)`, nil, errors.New(`fileOpen(): missing or invalid file path`)},
-		/*  11 */ {`builtin "os.file"; handle=fileCreate(123)`, nil, errors.New(`fileCreate(): missing or invalid file path`)},
-		/*  12 */ {`builtin "os.file"; handle=fileAppend(123)`, nil, errors.New(`fileAppend(): missing or invalid file path`)},
-		/*  13 */ {`builtin "os.file"; handle=fileClose(123)`, nil, errors.New(`fileClose(): invalid file handle`)},
+		/*   7 */ {`builtin "os.file"; word=fileReadText(nil, "-")`, nil, `fileReadText(): invalid file handle`},
+		/*   8 */ {`builtin "os.file"; fileWriteText(nil, "bye")`, nil, `fileWriteText(): invalid file handle`},
+		/*   9 */ {`builtin "os.file"; handle=fileOpen()`, nil, `fileOpen(): too few params -- expected 1, got 0`},
+		/*  10 */ {`builtin "os.file"; handle=fileOpen(123)`, nil, `fileOpen(): missing or invalid file path`},
+		/*  11 */ {`builtin "os.file"; handle=fileCreate(123)`, nil, `fileCreate(): missing or invalid file path`},
+		/*  12 */ {`builtin "os.file"; handle=fileAppend(123)`, nil, `fileAppend(): missing or invalid file path`},
+		/*  13 */ {`builtin "os.file"; handle=fileClose(123)`, nil, `fileClose(): invalid file handle`},
 		/*  14 */ {`builtin "os.file"; handle=fileOpen("/tmp/dummy"); c=fileReadTextAll(handle); fileClose(handle); c`, "bye-bye", nil},
-		/*  15 */ {`builtin "os.file"; c=fileReadTextAll(123)`, nil, errors.New(`fileReadTextAll(): invalid file handle 123 [int64]`)},
+		/*  15 */ {`builtin "os.file"; c=fileReadTextAll(123)`, nil, `fileReadTextAll(): invalid file handle 123 [int64]`},
 	}

 	// t.Setenv("EXPR_PATH", ".")

-	// parserTestSpec(t, section, inputs, 69)
+	// runTestSuiteSpec(t, section, inputs, 1)
 	runTestSuite(t, section, inputs)
 }
--- a/t_builtin-string_test.go
+++ b/t_builtin-string_test.go
@ -5,7 +5,6 @@
 package expr

 import (
-	"errors"
 	"testing"
 )

@ -16,8 +15,8 @@ func TestFuncString(t *testing.T) {
 		/*   1 */ {`builtin "string"; strJoin("-", "one", "two", "three")`, "one-two-three", nil},
 		/*   2 */ {`builtin "string"; strJoin("-", ["one", "two", "three"])`, "one-two-three", nil},
 		/*   3 */ {`builtin "string"; ls= ["one", "two", "three"]; strJoin("-", ls)`, "one-two-three", nil},
-		/*   4 */ {`builtin "string"; ls= ["one", "two", "three"]; strJoin(1, ls)`, nil, errors.New(`strJoin(): the "separator" parameter must be a string, got a integer (1)`)},
-		/*   5 */ {`builtin "string"; ls= ["one", 2, "three"]; strJoin("-", ls)`, nil, errors.New(`strJoin(): expected string, got integer (2)`)},
+		/*   4 */ {`builtin "string"; ls= ["one", "two", "three"]; strJoin(1, ls)`, nil, `strJoin(): the "separator" parameter must be a string, got a integer (1)`},
+		/*   5 */ {`builtin "string"; ls= ["one", 2, "three"]; strJoin("-", ls)`, nil, `strJoin(): expected string, got integer (2)`},
 		/*   6 */ {`builtin "string"; "<"+strTrim("  bye bye  ")+">"`, "<bye bye>", nil},
 		/*   7 */ {`builtin "string"; strSub("0123456789", 1,2)`, "12", nil},
 		/*   8 */ {`builtin "string"; strSub("0123456789", -3,2)`, "78", nil},
@ -25,13 +24,13 @@ func TestFuncString(t *testing.T) {
 		/*  10 */ {`builtin "string"; strSub("0123456789")`, "0123456789", nil},
 		/*  11 */ {`builtin "string"; strStartsWith("0123456789", "xyz", "012")`, true, nil},
 		/*  12 */ {`builtin "string"; strStartsWith("0123456789", "xyz", "0125")`, false, nil},
-		/*  13 */ {`builtin "string"; strStartsWith("0123456789")`, nil, errors.New(`strStartsWith(): too few params -- expected 2 or more, got 1`)},
+		/*  13 */ {`builtin "string"; strStartsWith("0123456789")`, nil, `strStartsWith(): too few params -- expected 2 or more, got 1`},
 		/*  14 */ {`builtin "string"; strEndsWith("0123456789", "xyz", "789")`, true, nil},
 		/*  15 */ {`builtin "string"; strEndsWith("0123456789", "xyz", "0125")`, false, nil},
-		/*  16 */ {`builtin "string"; strEndsWith("0123456789")`, nil, errors.New(`strEndsWith(): too few params -- expected 2 or more, got 1`)},
+		/*  16 */ {`builtin "string"; strEndsWith("0123456789")`, nil, `strEndsWith(): too few params -- expected 2 or more, got 1`},
 		/*  17 */ {`builtin "string"; strSplit("one-two-three", "-")`, newListA("one", "two", "three"), nil},
-		/*  18 */ {`builtin "string"; strJoin("-", [1, "two", "three"])`, nil, errors.New(`strJoin(): expected string, got integer (1)`)},
-		/*  19 */ {`builtin "string"; strJoin()`, nil, errors.New(`strJoin(): too few params -- expected 1 or more, got 0`)},
+		/*  18 */ {`builtin "string"; strJoin("-", [1, "two", "three"])`, nil, `strJoin(): expected string, got integer (1)`},
+		/*  19 */ {`builtin "string"; strJoin()`, nil, `strJoin(): too few params -- expected 1 or more, got 0`},

 		/*  69 */ /*{`builtin "string"; $$global`, `vars: {
 		}
--- a/t_common_test.go
+++ b/t_common_test.go
@ -5,6 +5,7 @@
 package expr

 import (
+	"errors"
 	"reflect"
 	"strings"
 	"testing"
@ -13,7 +14,7 @@ import (
 type inputType struct {
 	source     string
 	wantResult any
-	wantErr    error
+	wantErr    any
 }

 func runCtxTestSuiteSpec(t *testing.T, ctx ExprContext, section string, inputs []inputType, spec ...int) {
@ -52,20 +53,17 @@ func runCtxTestSuite(t *testing.T, ctx ExprContext, section string, inputs []inp
 }
 func runTestSuite(t *testing.T, section string, inputs []inputType) {
 	runCtxTestSuite(t, nil, section, inputs)
-/*
-	succeeded := 0
-	failed := 0
+}

-	for i, input := range inputs {
-		good := doTest(t, nil, section, &input, i+1)
-		if good {
-			succeeded++
-		} else {
-			failed++
+func getWantedError(input *inputType) error {
+	var wantErr error
+	var ok bool
+	if wantErr, ok = input.wantErr.(error); !ok {
+		if msg, ok := input.wantErr.(string); ok {
+			wantErr = errors.New(msg)
 		}
 	}
-	t.Logf("%s -- test count: %d, succeeded: %d, failed: %d", section, len(inputs), succeeded, failed)
-*/
+	return wantErr
 }

 func doTest(t *testing.T, ctx ExprContext, section string, input *inputType, count int) (good bool) {
@ -73,12 +71,14 @@ func doTest(t *testing.T, ctx ExprContext, section string, input *inputType, cou
 	var gotResult any
 	var gotErr error

+	wantErr := getWantedError(input)
+
 	parser := NewParser()
 	if ctx == nil {
 		ctx = NewSimpleStore()
 	}

-	logTest(t, count, section, input.source, input.wantResult, input.wantErr)
+	logTest(t, count, section, input.source, input.wantResult, wantErr)

 	r := strings.NewReader(input.source)
 	scanner := NewScanner(r, DefaultTranslations())
@ -95,9 +95,9 @@ func doTest(t *testing.T, ctx ExprContext, section string, input *inputType, cou
 		good = false
 	}

-	if gotErr != input.wantErr {
-		if input.wantErr == nil || gotErr == nil || (gotErr.Error() != input.wantErr.Error()) {
-			t.Errorf("%d: %q -> got-err = <%v>, expected-err = <%v>", count, input.source, gotErr, input.wantErr)
+	if gotErr != wantErr {
+		if wantErr == nil || gotErr == nil || (gotErr.Error() != wantErr.Error()) {
+			t.Errorf("%d: %q -> got-err = <%v>, expected-err = <%v>", count, input.source, gotErr, wantErr)
 			good = false
 		}
 	}
--- a/t_fractions_test.go
+++ b/t_fractions_test.go
@ -5,7 +5,6 @@
 package expr

 import (
-	"errors"
 	"testing"
 )

@ -18,21 +17,22 @@ func TestFractionsParser(t *testing.T) {
 		/*   4 */ {`1|2 * 1`, newFraction(1, 2), nil},
 		/*   5 */ {`1|2 * 2|3`, newFraction(2, 6), nil},
 		/*   6 */ {`1|2 / 2|3`, newFraction(3, 4), nil},
-		/*   7 */ {`1|"5"`, nil, errors.New(`denominator must be integer, got string (5)`)},
-		/*   8 */ {`"1"|5`, nil, errors.New(`numerator must be integer, got string (1)`)},
-		/*   9 */ {`1|+5`, nil, errors.New(`[1:3] infix operator "|" requires two non-nil operands, got 1`)},
+		/*   7 */ {`1|"5"`, nil, `denominator must be integer, got string (5)`},
+		/*   8 */ {`"1"|5`, nil, `numerator must be integer, got string (1)`},
+		/*   9 */ {`1|+5`, nil, `[1:3] infix operator "|" requires two non-nil operands, got 1`},
 		/*  10 */ {`1|(-2)`, newFraction(-1, 2), nil},
 		/*  11 */ {`builtin "math.arith"; add(1|2, 2|3)`, newFraction(7, 6), nil},
 		/*  12 */ {`builtin "math.arith"; add(1|2, 1.0, 2)`, float64(3.5), nil},
 		/*  13 */ {`builtin "math.arith"; mul(1|2, 2|3)`, newFraction(2, 6), nil},
 		/*  14 */ {`builtin "math.arith"; mul(1|2, 1.0, 2)`, float64(1.0), nil},
-		/*  15 */ {`1|0`, nil, errors.New(`division by zero`)},
+		/*  15 */ {`1|0`, nil, `division by zero`},
 		/*  16 */ {`fract(-0.5)`, newFraction(-1, 2), nil},
-		/*  17 */ {`fract("")`, (*FractionType)(nil), errors.New(`bad syntax`)},
+		/*  17 */ {`fract("")`, (*FractionType)(nil), `bad syntax`},
 		/*  18 */ {`fract("-1")`, newFraction(-1, 1), nil},
 		/*  19 */ {`fract("+1")`, newFraction(1, 1), nil},
-		/*  20 */ {`fract("1a")`, (*FractionType)(nil), errors.New(`strconv.ParseInt: parsing "1a": invalid syntax`)},
-		/*  21 */ {`fract(1,0)`, nil, errors.New(`fract(): division by zero`)},
+		/*  20 */ {`fract("1a")`, (*FractionType)(nil), `strconv.ParseInt: parsing "1a": invalid syntax`},
+		/*  21 */ {`fract(1,0)`, nil, `fract(): division by zero`},
+		/*  22 */ {`string(1|2)`, "1|2", nil},
 	}
 	runTestSuite(t, section, inputs)
 }
--- a/t_funcs_test.go
+++ b/t_funcs_test.go
@ -5,7 +5,6 @@
 package expr

 import (
-	"errors"
 	"testing"
 )

@ -17,18 +16,18 @@ func TestFuncs(t *testing.T) {
 		/*   3 */ {`double=func(x){2*x}; double(3)`, int64(6), nil},
 		/*   4 */ {`double=func(x){2*x}; a=5; double(3+a) + 1`, int64(17), nil},
 		/*   5 */ {`double=func(x){2*x}; a=5; two=func() {2}; (double(3+a) + 1) * two()`, int64(34), nil},
-		/*   6 */ {`@x="hello"; @x`, nil, errors.New(`[1:3] variable references are not allowed in top level expressions: "@x"`)},
+		/*   6 */ {`@x="hello"; @x`, nil, `[1:3] variable references are not allowed in top level expressions: "@x"`},
 		/*   7 */ {`f=func(){@x="hello"}; f(); x`, "hello", nil},
 		/*   8 */ {`f=func(@y){@y=@y+1}; f(2); y`, int64(3), nil},
-		/*   9 */ {`f=func(@y){g=func(){@x=5}; @y=@y+g()}; f(2); y+x`, nil, errors.New(`undefined variable or function "x"`)},
+		/*   9 */ {`f=func(@y){g=func(){@x=5}; @y=@y+g()}; f(2); y+x`, nil, `undefined variable or function "x"`},
 		/*  10 */ {`f=func(@y){g=func(){@x=5}; @z=g(); @y=@y+@z}; f(2); y+z`, int64(12), nil},
 		/*  11 */ {`f=func(@y){g=func(){@x=5}; g(); @z=x; @y=@y+@z}; f(2); y+z`, int64(12), nil},
 		/*  12 */ {`f=func(@y){g=func(){@x=5}; g(); @z=x; @x=@y+@z}; f(2); y+x`, int64(9), nil},
 		/*  13 */ {`two=func(){2}; four=func(f){f()+f()}; four(two)`, int64(4), nil},
-		/*  14 */ {`two=func(){2}; two(123)`, nil, errors.New(`two(): too much params -- expected 0, got 1`)},
+		/*  14 */ {`two=func(){2}; two(123)`, nil, `two(): too much params -- expected 0, got 1`},
 		/*  15 */ {`f=func(x,n=2){x+n}; f(3)`, int64(5), nil},
-		/*  16 */ {`f=func(x,n=2,y){x+n}`, nil, errors.New(`[1:16] can't mix default and non-default parameters`)},
-		/*  17 */ {`f=func(x,n){1}; f(3,4,)`, nil, errors.New(`[1:24] expected "function-param-value", got ")"`)},
+		/*  16 */ {`f=func(x,n=2,y){x+n}`, nil, `[1:16] can't mix default and non-default parameters`},
+		/*  17 */ {`f=func(x,n){1}; f(3,4,)`, nil, `[1:24] expected "function-param-value", got ")"`},
 		/*  18 */ {`factory=func(base){func(){@base=base+1}}; inc10=factory(10); inc5=factory(5); inc10(); inc5(); inc10()`, int64(12), nil},
 		/*  19 */ {`f=func(a,y=1,z="sos"){}; string(f)`, `f(a, y=1, z="sos"):any{}`, nil},
 		// /*  18 */ {`f=func(a){a*2}`, nil, errors.New(`[1:24] expected "function-param-value", got ")"`)},
--- a/t_index_test.go
+++ b/t_index_test.go
@ -5,7 +5,6 @@
 package expr

 import (
-	"errors"
 	"testing"
 )

@ -17,7 +16,7 @@ func TestCollections(t *testing.T) {
 		/*   3 */ {`"abcdef"[1:]`, "bcdef", nil},
 		/*   4 */ {`"abcdef"[:]`, "abcdef", nil},
 		// /*   5 */ {`[0,1,2,3,4][:]`, ListType{int64(0), int64(1), int64(2), int64(3), int64(4)}, nil},
-		/*   5 */ {`"abcdef"[1:2:3]`, nil, errors.New(`[1:14] left operand '(1, 2)' [pair] and right operand '3' [integer] are not compatible with operator ":"`)},
+		/*   5 */ {`"abcdef"[1:2:3]`, nil, `[1:14] left operand '(1, 2)' [pair] and right operand '3' [integer] are not compatible with operator ":"`},
 	}

 	t.Setenv("EXPR_PATH", ".")
--- a/t_iterator_test.go
+++ b/t_iterator_test.go
@ -7,6 +7,7 @@ package expr
 import "testing"

 func TestIteratorParser(t *testing.T) {
+	section := "Iterator"
 	inputs := []inputType{
 		/*   1 */ {`include "test-resources/iterator.expr"; it=$(ds,3); ()it`, int64(0), nil},
 		/*   2 */ {`include "test-resources/iterator.expr"; it=$(ds,3); it++; it++`, int64(1), nil},
@ -22,5 +23,6 @@ func TestIteratorParser(t *testing.T) {
 	// inputs1 := []inputType{
 	// 	/*   1 */ {`0?{}`, nil, nil},
 	// }
-	runTestSuite(t, "Iterator", inputs)
+	// runTestSuiteSpec(t, section, inputs, 1)
+	runTestSuite(t, section, inputs)
 }
--- a/t_list_test.go
+++ b/t_list_test.go
@ -5,7 +5,6 @@
 package expr

 import (
-	"errors"
 	"testing"
 )

@ -22,14 +21,14 @@ func TestListParser(t *testing.T) {
 		/*   7 */ {`add([1,4,3,2])`, int64(10), nil},
 		/*   8 */ {`add([1,[2,2],3,2])`, int64(10), nil},
 		/*   9 */ {`mul([1,4,3.0,2])`, float64(24.0), nil},
-		/*  10 */ {`add([1,"hello"])`, nil, errors.New(`add(): param nr 2 (2 in 1) has wrong type string, number expected`)},
+		/*  10 */ {`add([1,"hello"])`, nil, `add(): param nr 2 (2 in 1) has wrong type string, number expected`},
 		/*  11 */ {`[a=1,b=2,c=3] but a+b+c`, int64(6), nil},
 		/*  12 */ {`[1,2,3] << 2+2`, newListA(int64(1), int64(2), int64(3), int64(4)), nil},
 		/*  13 */ {`2-1 >> [2,3]`, newListA(int64(1), int64(2), int64(3)), nil},
 		/*  14 */ {`[1,2,3][1]`, int64(2), nil},
 		/*  15 */ {`ls=[1,2,3] but ls[1]`, int64(2), nil},
 		/*  16 */ {`ls=[1,2,3] but ls[-1]`, int64(3), nil},
-		/*  17 */ {`list=["one","two","three"]; list[10]`, nil, errors.New(`[1:34] index 10 out of bounds`)},
+		/*  17 */ {`list=["one","two","three"]; list[10]`, nil, `[1:34] index 10 out of bounds`},
 		/*  18 */ {`["a", "b", "c"]`, newListA("a", "b", "c"), nil},
 		/*  19 */ {`["a", "b", "c"]`, newList([]any{"a", "b", "c"}), nil},
 		/*  20 */ {`#["a", "b", "c"]`, int64(3), nil},
@ -37,18 +36,18 @@ func TestListParser(t *testing.T) {
 		/*  22 */ {`a=[1,2]; (a)<<3`, newListA(int64(1), int64(2), int64(3)), nil},
 		/*  23 */ {`a=[1,2]; (a)<<3; a`, newListA(int64(1), int64(2)), nil},
 		/*  24 */ {`["a","b","c","d"][1]`, "b", nil},
-		/*  25 */ {`["a","b","c","d"][1,1]`, nil, errors.New(`[1:19] one index only is allowed`)},
+		/*  25 */ {`["a","b","c","d"][1,1]`, nil, `[1:19] one index only is allowed`},
 		/*  26 */ {`[0,1,2,3,4][:]`, newListA(int64(0), int64(1), int64(2), int64(3), int64(4)), nil},
-		/*  27 */ {`["a", "b", "c"] << ;`, nil, errors.New(`[1:18] infix operator "<<" requires two non-nil operands, got 1`)},
-		/*  28 */ {`2 << 3;`, nil, errors.New(`[1:4] left operand '2' [integer] and right operand '3' [integer] are not compatible with operator "<<"`)},
-		/*  29 */ {`but >> ["a", "b", "c"]`, nil, errors.New(`[1:6] infix operator ">>" requires two non-nil operands, got 0`)},
-		/*  30 */ {`2 >> 3;`, nil, errors.New(`[1:4] left operand '2' [integer] and right operand '3' [integer] are not compatible with operator ">>"`)},
+		/*  27 */ {`["a", "b", "c"] << ;`, nil, `[1:18] infix operator "<<" requires two non-nil operands, got 1`},
+		/*  28 */ {`2 << 3;`, nil, `[1:4] left operand '2' [integer] and right operand '3' [integer] are not compatible with operator "<<"`},
+		/*  29 */ {`but >> ["a", "b", "c"]`, nil, `[1:6] infix operator ">>" requires two non-nil operands, got 0`},
+		/*  30 */ {`2 >> 3;`, nil, `[1:4] left operand '2' [integer] and right operand '3' [integer] are not compatible with operator ">>"`},
 		/*  31 */ {`a=[1,2]; a<<3`, newListA(int64(1), int64(2), int64(3)), nil},
 		/*  33 */ {`a=[1,2]; 5>>a`, newListA(int64(5), int64(1), int64(2)), nil},
 		/*  34 */ {`L=[1,2]; L[0]=9; L`, newListA(int64(9), int64(2)), nil},
-		/*  35 */ {`L=[1,2]; L[5]=9; L`, nil, errors.New(`index 5 out of bounds (0, 1)`)},
-		/*  36 */ {`L=[1,2]; L[]=9; L`, nil, errors.New(`[1:12] index/key specification expected, got [] [list]`)},
-		/*  37 */ {`L=[1,2]; L[nil]=9;`, nil, errors.New(`[1:12] index/key is nil`)},
+		/*  35 */ {`L=[1,2]; L[5]=9; L`, nil, `index 5 out of bounds (0, 1)`},
+		/*  36 */ {`L=[1,2]; L[]=9; L`, nil, `[1:12] index/key specification expected, got [] [list]`},
+		/*  37 */ {`L=[1,2]; L[nil]=9;`, nil, `[1:12] index/key is nil`},
 		/*  38 */ {`[0,1,2,3,4][2:3]`, newListA(int64(2)), nil},
 		/*  39 */ {`[0,1,2,3,4][3:-1]`, newListA(int64(3)), nil},
 		/*  40 */ {`[0,1,2,3,4][-3:-1]`, newListA(int64(2), int64(3)), nil},
@ -57,6 +56,6 @@ func TestListParser(t *testing.T) {

 	// t.Setenv("EXPR_PATH", ".")

-	// parserTestSpec(t, section, inputs, 17)
+	// runTestSuiteSpec(t, section, inputs, 1)
 	runTestSuite(t, section, inputs)
 }
--- a/t_parser_test.go
+++ b/t_parser_test.go
@ -5,7 +5,6 @@
 package expr

 import (
-	"errors"
 	"testing"
 )

@ -49,13 +48,13 @@ func TestGeneralParser(t *testing.T) {
 		/*  34 */ {`(((1)))`, int64(1), nil},
 		/*  35 */ {`var2="abc"; "uno_" + var2`, `uno_abc`, nil},
 		/*  36 */ {`0 || 0.0 && "hello"`, false, nil},
-		/*  37 */ {`"s" + true`, nil, errors.New(`[1:6] left operand 's' [string] and right operand 'true' [bool] are not compatible with operator "+"`)},
-		/*  38 */ {`+false`, nil, errors.New(`[1:2] prefix/postfix operator "+" do not support operand 'false' [bool]`)},
+		/*  37 */ {`"s" + true`, nil, `[1:6] left operand 's' [string] and right operand 'true' [bool] are not compatible with operator "+"`},
+		/*  38 */ {`+false`, nil, `[1:2] prefix/postfix operator "+" do not support operand 'false' [bool]`},
 		/*  39 */ {`false // very simple expression`, false, nil},
-		/*  40 */ {`1 + // Missing right operator`, nil, errors.New(`[1:4] infix operator "+" requires two non-nil operands, got 1`)},
+		/*  40 */ {`1 + // Missing right operator`, nil, `[1:4] infix operator "+" requires two non-nil operands, got 1`},
 		/*  41 */ {"", nil, nil},
 		/*  42 */ {"4!", int64(24), nil},
-		/*  43 */ {"(-4)!", nil, errors.New(`factorial of a negative integer (-4) is not allowed`)},
+		/*  43 */ {"(-4)!", nil, `factorial of a negative integer (-4) is not allowed`},
 		/*  44 */ {"-4!", int64(-24), nil},
 		/*  45 */ {"1.5 < 7", true, nil},
 		/*  46 */ {"1.5 > 7", false, nil},
@ -67,20 +66,20 @@ func TestGeneralParser(t *testing.T) {
 		/*  52 */ {`"1.5" > "7"`, false, nil},
 		/*  53 */ {`"1.5" == "7"`, false, nil},
 		/*  54 */ {`"1.5" != "7"`, true, nil},
-		/*  55 */ {"1.5 < ", nil, errors.New(`[1:6] infix operator "<" requires two non-nil operands, got 1`)},
-		/*  56 */ {"1.5 > ", nil, errors.New(`[1:6] infix operator ">" requires two non-nil operands, got 1`)},
-		/*  57 */ {"1.5 <= ", nil, errors.New(`[1:6] infix operator "<=" requires two non-nil operands, got 1`)},
-		/*  58 */ {"1.5 >= ", nil, errors.New(`[1:6] infix operator ">=" requires two non-nil operands, got 1`)},
-		/*  59 */ {"1.5 != ", nil, errors.New(`[1:6] infix operator "!=" requires two non-nil operands, got 1`)},
-		/*  60 */ {"1.5 == ", nil, errors.New(`[1:6] infix operator "==" requires two non-nil operands, got 1`)},
-		/*  61 */ {`"1.5" < `, nil, errors.New(`[1:8] infix operator "<" requires two non-nil operands, got 1`)},
-		/*  62 */ {`"1.5" > `, nil, errors.New(`[1:8] infix operator ">" requires two non-nil operands, got 1`)},
-		/*  63 */ {`"1.5" == `, nil, errors.New(`[1:8] infix operator "==" requires two non-nil operands, got 1`)},
-		/*  64 */ {`"1.5" != `, nil, errors.New(`[1:8] infix operator "!=" requires two non-nil operands, got 1`)},
+		/*  55 */ {"1.5 < ", nil, `[1:6] infix operator "<" requires two non-nil operands, got 1`},
+		/*  56 */ {"1.5 > ", nil, `[1:6] infix operator ">" requires two non-nil operands, got 1`},
+		/*  57 */ {"1.5 <= ", nil, `[1:6] infix operator "<=" requires two non-nil operands, got 1`},
+		/*  58 */ {"1.5 >= ", nil, `[1:6] infix operator ">=" requires two non-nil operands, got 1`},
+		/*  59 */ {"1.5 != ", nil, `[1:6] infix operator "!=" requires two non-nil operands, got 1`},
+		/*  60 */ {"1.5 == ", nil, `[1:6] infix operator "==" requires two non-nil operands, got 1`},
+		/*  61 */ {`"1.5" < `, nil, `[1:8] infix operator "<" requires two non-nil operands, got 1`},
+		/*  62 */ {`"1.5" > `, nil, `[1:8] infix operator ">" requires two non-nil operands, got 1`},
+		/*  63 */ {`"1.5" == `, nil, `[1:8] infix operator "==" requires two non-nil operands, got 1`},
+		/*  64 */ {`"1.5" != `, nil, `[1:8] infix operator "!=" requires two non-nil operands, got 1`},
 		/*  65 */ {"+1.5", float64(1.5), nil},
-		/*  66 */ {"+", nil, errors.New(`[1:2] prefix operator "+" requires one not nil operand`)},
-		/*  67 */ {"4 / 0", nil, errors.New(`division by zero`)},
-		/*  68 */ {"4.0 / 0", nil, errors.New(`division by zero`)},
+		/*  66 */ {"+", nil, `[1:2] prefix operator "+" requires one not nil operand`},
+		/*  67 */ {"4 / 0", nil, `division by zero`},
+		/*  68 */ {"4.0 / 0", nil, `division by zero`},
 		/*  69 */ {"4.0 / \n2", float64(2.0), nil},
 		/*  70 */ {`123`, int64(123), nil},
 		/*  71 */ {`1.`, float64(1.0), nil},
@ -92,7 +91,7 @@ func TestGeneralParser(t *testing.T) {
 		/*  77 */ {`5 % 2`, int64(1), nil},
 		/*  78 */ {`5 % (-2)`, int64(1), nil},
 		/*  79 */ {`-5 % 2`, int64(-1), nil},
-		/*  80 */ {`5 % 2.0`, nil, errors.New(`[1:4] left operand '5' [integer] and right operand '2' [float] are not compatible with operator "%"`)},
+		/*  80 */ {`5 % 2.0`, nil, `[1:4] left operand '5' [integer] and right operand '2' [float] are not compatible with operator "%"`},
 		/*  81 */ {`"a" < "b" AND NOT (2 < 1)`, true, nil},
 		/*  82 */ {`"a" < "b" AND NOT (2 == 1)`, true, nil},
 		/*  83 */ {`"a" < "b" AND ~ 2 == 1`, true, nil},
@ -105,12 +104,12 @@ func TestGeneralParser(t *testing.T) {
 		/*  90 */ {`x=2 but x*10`, int64(20), nil},
 		/*  91 */ {`false and true`, false, nil},
 		/*  92 */ {`false and (x==2)`, false, nil},
-		/*  93 */ {`false and (x=2 but x==2) or x==2`, nil, errors.New(`undefined variable or function "x"`)},
+		/*  93 */ {`false and (x=2 but x==2) or x==2`, nil, `undefined variable or function "x"`},
 		/*  94 */ {`false or true`, true, nil},
-		/*  95 */ {`false or (x==2)`, nil, errors.New(`undefined variable or function "x"`)},
+		/*  95 */ {`false or (x==2)`, nil, `undefined variable or function "x"`},
 		/*  96 */ {`a=5; a`, int64(5), nil},
-		/*  97 */ {`2=5`, nil, errors.New(`[1:2] left operand of "=" must be a variable or a collection's item`)},
-		/*  98 */ {`2+a=5`, nil, errors.New(`[1:3] left operand of "=" must be a variable or a collection's item`)},
+		/*  97 */ {`2=5`, nil, `[1:2] left operand of "=" must be a variable or a collection's item`},
+		/*  98 */ {`2+a=5`, nil, `[1:3] left operand of "=" must be a variable or a collection's item`},
 		/*  99 */ {`2+(a=5)`, int64(7), nil},
 		/* 100 */ {`x ?? "default"`, "default", nil},
 		/* 101 */ {`x="hello"; x ?? "default"`, "hello", nil},
@ -120,22 +119,28 @@ func TestGeneralParser(t *testing.T) {
 		/* 105 */ {`1 ? {"a"} : {"b"}`, "b", nil},
 		/* 106 */ {`10 ? {"a"} : {"b"} :: {"c"}`, "c", nil},
 		/* 107 */ {`10 ? {"a"} :[true, 2+8] {"b"} :: {"c"}`, "b", nil},
-		/* 108 */ {`10 ? {"a"} :[true, 2+8] {"b"} ::[10] {"c"}`, nil, errors.New(`[1:34] case list in default clause`)},
+		/* 108 */ {`10 ? {"a"} :[true, 2+8] {"b"} ::[10] {"c"}`, nil, `[1:34] case list in default clause`},
 		/* 109 */ {`10 ? {"a"} :[10] {x="b" but x} :: {"c"}`, "b", nil},
 		/* 110 */ {`10 ? {"a"} :[10] {x="b"; x} :: {"c"}`, "b", nil},
-		/* 111 */ {`10 ? {"a"} : {"b"}`, nil, errors.New(`[1:3] no case catches the value (10) of the selection expression`)},
-		/* 112 */ {`10 ? {"a"} :: {"b"} : {"c"}`, nil, errors.New(`[1:22] selector-case outside of a selector context`)},
+		/* 111 */ {`10 ? {"a"} : {"b"}`, nil, `[1:3] no case catches the value (10) of the selection expression`},
+		/* 112 */ {`10 ? {"a"} :: {"b"} : {"c"}`, nil, `[1:22] selector-case outside of a selector context`},
 		/* 113 */ {`1 ? {"a"} : {"b"} ? ["a"] {"A"} :["b"] {"B"}`, "B", nil},
 		/* 114 */ {`2 + 1 ? {"a"} : {"b"} * 3`, "2bbb", nil},
 		/* 115 */ {`nil`, nil, nil},
-		/* 116 */ {`null`, nil, errors.New(`undefined variable or function "null"`)},
-		/* 117 */ {`{"key"}`, nil, errors.New(`[1:8] expected ":", got "}"`)},
-		/* 118 */ {`{"key":}`, nil, errors.New(`[1:9] expected "dictionary-value", got "}"`)},
+		/* 116 */ {`null`, nil, `undefined variable or function "null"`},
+		/* 117 */ {`{"key"}`, nil, `[1:8] expected ":", got "}"`},
+		/* 118 */ {`{"key":}`, nil, `[1:9] expected "dictionary-value", got "}"`},
 		/* 119 */ {`{}`, &DictType{}, nil},
 		/* 120 */ {`v=10; v++; v`, int64(11), nil},
 		/* 121 */ {`1+1|2+0.5`, float64(2), nil},
 		/* 122 */ {`1.2()`, newFraction(6, 5), nil},
-		/* 123 */ {`1|(2-2)`, nil, errors.New(`division by zero`)},
+		/* 123 */ {`1|(2-2)`, nil, `division by zero`},
+		/* 124 */ {`x="abc"; x ?! #x`, int64(3), nil},
+		/* 125 */ {`x ?! #x`, nil, `[1:7] prefix/postfix operator "#" do not support operand '<nil>' [nil]`},
+		/* 126 */ {`x ?! (x+1)`, nil, nil},
+		/* 127 */ {`"abx" ?! (x+1)`, nil, `[1:6] left operand of "?!" must be a variable`},
+		/* 128 */ {`"abx" ?? "pqr"`, nil, `[1:6] left operand of "??" must be a variable`},
+		/* 129 */ {`"abx" ?= "pqr"`, nil, `[1:6] left operand of "?=" must be a variable`},
 	}

 	// t.Setenv("EXPR_PATH", ".")
Author	SHA1	Message	Date
Celestino Amoroso	93dac956fb	t_parser_test.go: more tests on ??, ?= and ?! operators	2024-07-06 17:01:23 +02:00
Celestino Amoroso	307027d23d	t_parser_test.go: changed all error values to string values	2024-07-06 16:47:00 +02:00
Celestino Amoroso	896844e772	the common test framework now supports error, string and nil as value of the wantErr field	2024-07-06 16:43:13 +02:00
Celestino Amoroso	9fc20077a1	operator-include.go: the include operator did not count the number of files included when its argument was a single string	2024-07-06 16:08:58 +02:00
Celestino Amoroso	d2a4adebdd	dataCursor implements Typer interface	2024-07-06 16:05:54 +02:00
Celestino Amoroso	fd8e32e12b	new operator "?!" (alternate value)	2024-07-06 05:54:53 +02:00
Celestino Amoroso	1e62a51c15	t_fractions_test.go: added a test on the string() function	2024-07-06 04:56:00 +02:00
Celestino Amoroso	0170baa0f5	iter-list.go: implemented the Typer interface	2024-07-06 04:54:42 +02:00