go-pkg/expr
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Added new special operators like &= and <<=.

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Also made a litle change to scanner function moveOn(): now it moves on
the last char passed and only if there are more than one chars.
This commit is contained in:
Celestino Amoroso
2024-12-29 19:26:02 +01:00
parent e43823740f
commit eccb0c4dc9
11 changed files with 346 additions and 278 deletions
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operator-shift.go
+22 -30
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@@ -4,7 +4,7 @@
// operator-shift.go
package expr
//-------- shift term
//-------- bit right shift term
func newRightShiftTerm(tk *Token) (inst *term) {
return &term{
@@ -16,13 +16,7 @@ func newRightShiftTerm(tk *Token) (inst *term) {
}
}
func evalRightShift(ctx ExprContext, opTerm *term) (v any, err error) {
var leftValue, rightValue any
if leftValue, rightValue, err = opTerm.evalInfix(ctx); err != nil {
return
}
func bitRightShift(opTerm *term, leftValue, rightValue any) (v any, err error) {
if IsInteger(leftValue) && IsInteger(rightValue) {
leftInt := leftValue.(int64)
rightInt := rightValue.(int64)
@@ -33,6 +27,17 @@ func evalRightShift(ctx ExprContext, opTerm *term) (v any, err error) {
return
}
func evalRightShift(ctx ExprContext, opTerm *term) (v any, err error) {
var leftValue, rightValue any
if leftValue, rightValue, err = opTerm.evalInfix(ctx); err != nil {
return
}
v, err = bitRightShift(opTerm, leftValue, rightValue)
return
}
func newLeftShiftTerm(tk *Token) (inst *term) {
return &term{
tk: *tk,
@@ -43,13 +48,7 @@ func newLeftShiftTerm(tk *Token) (inst *term) {
}
}
func evalLeftShift(ctx ExprContext, opTerm *term) (v any, err error) {
var leftValue, rightValue any
if leftValue, rightValue, err = opTerm.evalInfix(ctx); err != nil {
return
}
func bitLeftShift(opTerm *term, leftValue, rightValue any) (v any, err error) {
if IsInteger(leftValue) && IsInteger(rightValue) {
leftInt := leftValue.(int64)
rightInt := rightValue.(int64)
@@ -60,23 +59,16 @@ func evalLeftShift(ctx ExprContext, opTerm *term) (v any, err error) {
return
}
// func evalAssignAppend(ctx ExprContext, self *term) (v any, err error) {
// var leftValue, rightValue any
func evalLeftShift(ctx ExprContext, opTerm *term) (v any, err error) {
var leftValue, rightValue any
// if leftValue, rightValue, err = self.evalInfix(ctx); err != nil {
// return
// }
if leftValue, rightValue, err = opTerm.evalInfix(ctx); err != nil {
return
}
// if IsList(leftValue) {
// list, _ := leftValue.(*ListType)
// newList := append(*list, rightValue)
// v = &newList
// if
// } else {
// err = self.errIncompatibleTypes(leftValue, rightValue)
// }
// return
// }
v, err = bitLeftShift(opTerm, leftValue, rightValue)
return
}
// init
func init() {