go-pkg/expr
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linked-list supports index assign and concatenation

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This commit is contained in:
Celestino Amoroso
2026-07-13 11:34:25 +02:00
parent 072fd9af39
commit 4df222496d
7 changed files with 52 additions and 29 deletions
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operator-index.go
+19 -19
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@@ -29,10 +29,10 @@ func verifyKey(indexList *array.ArrayType) (index any, err error) {
return
}
func verifyIndex(indexTerm *scan.Term, indexList *array.ArrayType, maxValue int) (index int, err error) {
var v int
func verifyIndex(indexTerm *scan.Term, indexList *array.ArrayType, maxValue int64) (index int64, err error) {
var v int64
if v, err = types.ToGoInt((*indexList)[0], "index expression"); err == nil {
if v, err = types.ToGoInt64((*indexList)[0], "index expression"); err == nil {
if v < 0 && v >= -maxValue {
v = maxValue + v
}
@@ -45,18 +45,18 @@ func verifyIndex(indexTerm *scan.Term, indexList *array.ArrayType, maxValue int)
return
}
func verifyRange(indexTerm *scan.Term, indexList *array.ArrayType, maxValue int) (startIndex, endIndex int, err error) {
func verifyRange(indexTerm *scan.Term, indexList *array.ArrayType, maxValue int64) (startIndex, endIndex int64, err error) {
v, _ := ((*indexList)[0]).(*intPair)
startIndex = v.a
endIndex = v.b
if endIndex == kern.ConstLastIndex {
endIndex = maxValue
endIndex = int64(maxValue)
}
if startIndex < 0 && startIndex >= -maxValue {
startIndex = maxValue + startIndex
startIndex = int64(maxValue) + startIndex
}
if endIndex < 0 && endIndex >= -maxValue {
endIndex = maxValue + endIndex
endIndex = int64(maxValue) + endIndex
}
if startIndex < 0 || startIndex > maxValue {
err = indexTerm.Errorf("range start-index %d is out of bounds", startIndex)
@@ -89,18 +89,18 @@ func evalIndex(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
if types.IsInteger((*indexList)[0]) {
switch unboxedValue := leftValue.(type) {
case *array.ArrayType:
var index int
if index, err = verifyIndex(indexTerm, indexList, len(*unboxedValue)); err == nil {
var index int64
if index, err = verifyIndex(indexTerm, indexList, int64(len(*unboxedValue))); err == nil {
v = (*unboxedValue)[index]
}
case *list.LinkedList:
var index int
if index, err = verifyIndex(indexTerm, indexList, unboxedValue.Len()); err == nil {
var index int64
if index, err = verifyIndex(indexTerm, indexList, int64(unboxedValue.Len())); err == nil {
v, err = unboxedValue.At(index)
}
case string:
var index int
if index, err = verifyIndex(indexTerm, indexList, len(unboxedValue)); err == nil {
var index int64
if index, err = verifyIndex(indexTerm, indexList, int64(len(unboxedValue))); err == nil {
v = string(unboxedValue[index])
}
case *dict.DictType:
@@ -111,19 +111,19 @@ func evalIndex(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
} else if isIntPair((*indexList)[0]) {
switch unboxedValue := leftValue.(type) {
case *array.ArrayType:
var start, end int
if start, end, err = verifyRange(indexTerm, indexList, len(*unboxedValue)); err == nil {
var start, end int64
if start, end, err = verifyRange(indexTerm, indexList, int64(len(*unboxedValue))); err == nil {
sublist := array.ArrayType((*unboxedValue)[start:end])
v = &sublist
}
case *list.LinkedList:
var start, end int
if start, end, err = verifyRange(indexTerm, indexList, unboxedValue.Len()); err == nil {
var start, end int64
if start, end, err = verifyRange(indexTerm, indexList, int64(unboxedValue.Len())); err == nil {
v = unboxedValue.Sub(start, end)
}
case string:
var start, end int
if start, end, err = verifyRange(indexTerm, indexList, len(unboxedValue)); err == nil {
var start, end int64
if start, end, err = verifyRange(indexTerm, indexList, int64(len(unboxedValue))); err == nil {
v = unboxedValue[start:end]
}
default: