expander-base-funcs.go -- Added function __trim and renamed __mapNC as __mac-np

dict-set-context.go

@@ -44,30 +44,43 @@ func NewDictSetContextV(flags DictSetFlag, varStores []map[string]string) *DictS
 	return ctx
 }
 
-func (self *DictSetContext) GetVar(name string) (value string, exists bool) {
+func (ctx *DictSetContext) GetVar(name string) (value string, exists bool) {
-	if value, exists = self.localStore[name]; !exists {
+	if value, exists = ctx.localStore[name]; !exists {
-		value, exists = findInStores(name, self.varStores)
+		value, exists = ctx.findInStores(name)
 	}
 	return
 }
 
-func (self *DictSetContext) SetVar(name string, value string) (repeatedValue string) {
+func (ctx *DictSetContext) SetVar(name string, value string) (repeatedValue string) {
-	self.localStore[name] = value
+	ctx.localStore[name] = value
 	return value
 }
 
-func findInStores(key string, stores []map[string]string) (value string, found bool) {
+func (ctx *DictSetContext) findInStores(key string) (value string, found bool) {
-	for _, vars := range stores {
+	if value, found = ctx.localStore[key]; !found {
-		if vars != nil {
+		for _, vars := range ctx.varStores {
-			if value, found = vars[key]; found {
+			if vars != nil {
-				break
+				if value, found = vars[key]; found {
+					break
+				}
 			}
 		}
 	}
 	return
 }
 
-func (self *DictSetContext) Handle(spec string, scanFlags ScannerFlag) (value string, err error) {
+// func findInStores(key string, stores []map[string]string) (value string, found bool) {
+// 	for _, vars := range stores {
+// 		if vars != nil {
+// 			if value, found = vars[key]; found {
+// 				break
+// 			}
+// 		}
+// 	}
+// 	return
+// }
+
+func (ctx *DictSetContext) Handle(spec string, scanFlags ScannerFlag) (value string, err error) {
 	var found bool
 	var rawValue string
 
@@ -81,30 +94,30 @@ func (self *DictSetContext) Handle(spec string, scanFlags ScannerFlag) (value st
 				rawValue = name
 				found = true
 			} else {
-				rawValue, found = findInStores(name, self.varStores)
+				rawValue, found = ctx.findInStores(name)
 			}
 		}
-		self.SetVar(pipeNameKey, name) // NOTE Maybe this line can be deleted
+		ctx.SetVar(pipeNameKey, name) // NOTE Maybe this line can be deleted
 
 		origVarFound := found
 		for _, part := range parts {
 			var expandedPart string
-			self.varStores[0][pipeValueKey] = rawValue
+			// ctx.varStores[0][pipeValueKey] = rawValue
-			self.SetVar(pipeValueKey, rawValue)
+			ctx.SetVar(pipeValueKey, rawValue)
-			if expandedPart, err = Scan(self, part); err != nil {
+			if expandedPart, err = Scan(ctx, part); err != nil {
 				break
 			}
-			self.SetVar(pipeNameKey, name)
+			ctx.SetVar(pipeNameKey, name)
-			if rawValue, err = self.evalContent(origVarFound, rawValue, expandedPart); err != nil {
+			if rawValue, err = ctx.evalContent(origVarFound, rawValue, expandedPart); err != nil {
 				break
 			}
 			origVarFound = true
 		}
 		if err == nil {
-			if len(rawValue) == 0 && (self.flags&KeepVar) != 0 {
+			if len(rawValue) == 0 && (ctx.flags&KeepVar) != 0 {
 				value = Var(name)
 			} else {
-				value, err = Scan(self, rawValue)
+				value, err = Scan(ctx, rawValue)
 				//value = rawValue
 			}
 		}
@@ -116,7 +129,7 @@ func (self *DictSetContext) Handle(spec string, scanFlags ScannerFlag) (value st
 	return
 }
 
-func (self *DictSetContext) evalContent(varFound bool, rawValue string, alternateValue string) (value string, err error) {
+func (ctx *DictSetContext) evalContent(varFound bool, rawValue string, alternateValue string) (value string, err error) {
 	var args []string
 	if args, err = sq.Split(alternateValue); err != nil {
 		return
@@ -127,8 +140,8 @@ func (self *DictSetContext) evalContent(varFound bool, rawValue string, alternat
 		op := args[0]
 		if strings.HasPrefix(op, "__") {
 			var f ExpanderFunc
-			if f, err = self.GetFunc(op); err == nil {
+			if f, err = ctx.GetFunc(op); err == nil {
-				value, err = f(self, rawValue, args[1:])
+				value, err = f(ctx, rawValue, args[1:])
 			}
 		} else if varFound {
 			value = rawValue

dict-set-context_test.go

@@ -33,13 +33,17 @@ func TestNewDictSetContext(t *testing.T) {
 	   err = fmt.Errorf("unsupported '%%%c' time specifier at %d", ch, i)
 	*/
 	now := time.Now()
-	yday := now.Add(-24*time.Hour)
+	yday := now.Add(-24 * time.Hour)
 	inputs := []inputType{
+		{ctx1, "${|__default ' abc cba '|__trim}", "abc cba", nil},
+		{ctx1, "${|__default two|__map ':' 'one:1' 'two:2' 'six:6'}", "2", nil},
+		{ctx1, "${|__default two|__map ':' 'one:1' 'TWO:2' 'six:6'}", "", nil},
+		{ctx1, "${|__default two|__map-nc ':' 'one:1' 'TWO:2' 'six:6'}", "2", nil},
 		{ctx2, `form: ${|__time-fmt now ""}`, fmt.Sprintf("form: %d-%02d-%02d %02d:%02d:%02d", now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), now.Second()), nil},
 		{ctx2, `form: ${|__time-fmt now "%-D"}`, fmt.Sprintf("form: %d-%d-%d", now.Year(), now.Month(), now.Day()), nil},
 		{ctx2, `form: ${|__time-fmt now "%:T"}`, fmt.Sprintf("form: %d:%d:%d", now.Hour(), now.Minute(), now.Second()), nil},
-		{ctx2, `form: ${|__time-fmt now "%02:T"}`,"", errors.New("invalid time specifier format at 3")},
+		{ctx2, `form: ${|__time-fmt now "%02:T"}`, "", errors.New("invalid time specifier format at 3")},
-		{ctx2, `form: ${|__time-fmt ""}`,"", errors.New("time value is empty")},
+		{ctx2, `form: ${|__time-fmt ""}`, "", errors.New("time value is empty")},
 		{ctx2, `form: ${|__time-fmt yesterday "%-D"}`, fmt.Sprintf("form: %d-%d-%d", yday.Year(), yday.Month(), yday.Day()), nil},
 		{ctx1, "${one|pippo}", "1", nil},
 		{ctx1, "${one|__default pluto}", "1", nil},
@@ -86,7 +90,6 @@ func TestNewDictSetContext(t *testing.T) {
 		if (gotErr != nil && input.wantErr == nil) || (gotErr == nil && input.wantErr != nil) || (gotErr.Error() != input.wantErr.Error()) {
 			t.Errorf("%d: %s(%q)/err = <%v>, want <%v>", i, funcName, input.source, gotErr, input.wantErr)
 		}
-
 	}
 }
 

expander-base-funcs.go

@@ -84,6 +84,40 @@ func ExFuncTrimSuffix(ctx ExpanderContext, varValue string, args []string) (resu
 	return
 }
 
+func ExFuncTrim(ctx ExpanderContext, varValue string, args []string) (result string, err error) {
+	result = strings.TrimSpace(varValue)
+	return
+}
+
+func ExFuncMap(ctx ExpanderContext, varValue string, args []string) (result string, err error) {
+	sep := args[0]
+	for _, pairSpec := range args[1:] {
+		pair := strings.SplitN(pairSpec, sep, 2)
+		if pair[0] == varValue {
+			if len(pair) == 2 {
+				result = pair[1]
+			}
+			break
+		}
+	}
+	return
+}
+
+func ExFuncMapNC(ctx ExpanderContext, varValue string, args []string) (result string, err error) {
+	sep := args[0]
+	varValue = strings.ToLower(varValue)
+	for _, pairSpec := range args[1:] {
+		pair := strings.SplitN(pairSpec, sep, 2)
+		if strings.ToLower(pair[0]) == varValue {
+			if len(pair) == 2 {
+				result = pair[1]
+			}
+			break
+		}
+	}
+	return
+}
+
 func AddBaseFuncs(ctx ExpanderContext) ExpanderContext {
 	ctx.AddFunc("__default", ExFuncDefault, 0, -1, "Returns the flow value if not empty, else all args joined; first arg is used as separator.")
 	ctx.AddFunc("__get", ExFuncGet, 0, 2, "Returns the value of the specified variable (arg1). With no arguments it returns the value of the variable having the flow value as name (same as __get ${.}). Arg2 is the default value. ")
@@ -91,6 +125,9 @@ func AddBaseFuncs(ctx ExpanderContext) ExpanderContext {
 	ctx.AddFunc("__join", ExFuncJoin, 1, -1, "Joins its args starting from the second. The first one (arg1) is the separator")
 	ctx.AddFunc("__lower", ExFuncLower, 0, 0, "Changes the flow value to lower case.")
 	ctx.AddFunc("__upper", ExFuncUpper, 0, 0, "Changes the flow value to upper case.")
+	ctx.AddFunc("__trim", ExFuncTrim, 0, 0, "Removes blanks on the left and on the right of the flow.")
 	ctx.AddFunc("__trim-suffix", ExFuncTrimSuffix, 1, 1, "Removes the specified suffix (arg1) from the flow.")
+	ctx.AddFunc("__map", ExFuncMap, 1, 1, "Returns the value mapped by the flow value as a key; e.g. two __map : 'one:1' 'two:2' 'six:6' returns 2")
+	ctx.AddFunc("__map-nc", ExFuncMapNC, 1, 1, "Same as __map but this comapares keys ignoring case differencies; e.g. two __map-nc : 'ONE:1' 'Two:2' 'sIX:6' returns 2")
 	return ctx
 }

expander-context.go

@@ -128,7 +128,7 @@ func (self *BaseExpander) AddFunc(name string, f ExpanderFunc, minArgs, maxArgs
 }
 
 func (self *BaseExpander) Handle(varSpec string, flags ScannerFlag) (value string, err error) {
-	err = errors.New("maybe you did somwthing wrong")
+	err = errors.New("maybe you did something wrong")
 	return
 }
 
@@ -140,4 +140,3 @@ func (self *BaseExpander) IterateFunc(op func(funcInfo *ExpanderFuncBlock) (err
 	}
 	return
 }
-

scanner.go

@@ -17,12 +17,11 @@ const (
 	EncryptValue
 )
 
-// Flags symbols in the abova iota order
+// Flags symbols in the above iota order
 const flagSymbols = "!=*"
 
 const defaultVarIntro = '$'
 
-
 type VariableHandler interface {
 	Handle(varSpec string, flags ScannerFlag) (value string, err error)
 }
@@ -31,7 +30,7 @@ func Scan(handler VariableHandler, source string) (result string, err error) {
 	return ScanExt(defaultVarIntro, handler, source)
 }
 
-func ScanExt(varIntro byte,  handler VariableHandler, source string) (result string, err error) {
+func ScanExt(varIntro byte, handler VariableHandler, source string) (result string, err error) {
 	var spec, value string
 	var flags ScannerFlag
 	var backSlash bool
@@ -123,4 +122,3 @@ func getVarSpec(source string, startOffset int) (spec string, flags ScannerFlag,
 	}
 	return
 }
-