go-pkg/expr
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operator-range.go: range-term registered with symbol SymRange

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This commit is contained in:
Celestino Amoroso 2024-12-23 06:55:57 +01:00
parent 76e01f12d2
commit f50ddf48db
1 changed files with 18 additions and 5 deletions
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23
operator-range.go
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@ -34,12 +34,16 @@ func newRangeTerm(tk *Token) (inst *term) {
}
}
func changeColonToRange(t *term) {
if t.tk.IsSymbol(SymColon) {
t.tk.Sym = SymRange
t.evalFunc = evalRange
}
}
func evalRange(ctx ExprContext, opTerm *term) (v any, err error) {
var leftValue, rightValue any
// if err = self.checkOperands(); err != nil {
// return
// }
if len(opTerm.children) == 0 {
leftValue = int64(0)
rightValue = int64(-1)
@ -52,7 +56,8 @@ func evalRange(ctx ExprContext, opTerm *term) (v any, err error) {
return
}
if !(IsInteger(leftValue) && IsInteger(rightValue)) {
err = opTerm.errIncompatibleTypes(leftValue, rightValue)
// err = opTerm.errIncompatibleTypes(leftValue, rightValue)
err = errRangeInvalidSpecification(opTerm)
return
}
@ -63,7 +68,15 @@ func evalRange(ctx ExprContext, opTerm *term) (v any, err error) {
return
}
func errRangeInvalidSpecification(t *term) error {
return t.Errorf("invalid range specification")
}
func errRangeUnexpectedExpression(t *term) error {
return t.Errorf("unexpected range expression")
}
// init
func init() {
registerTermConstructor(SymColon, newRangeTerm)
registerTermConstructor(SymRange, newRangeTerm)
}