go-pkg/expr
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iterator.go: exported some const identifier

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This commit is contained in:
Celestino Amoroso
2024-07-18 07:27:02 +02:00
parent 7745dc24e2
commit b4529499d6
6 changed files with 45 additions and 41 deletions
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data-cursor.go
+16 -12
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@@ -20,7 +20,7 @@ type dataCursor struct {
currentFunc Functor
}
func newDataCursor(ctx ExprContext, ds map[string]Functor) (dc *dataCursor) {
func NewDataCursor(ctx ExprContext, ds map[string]Functor) (dc *dataCursor) {
dc = &dataCursor{
ds: ds,
index: -1,
@@ -29,6 +29,10 @@ func newDataCursor(ctx ExprContext, ds map[string]Functor) (dc *dataCursor) {
return
}
func (dc *dataCursor) Context() ExprContext {
return dc.ctx
}
func (dc *dataCursor) TypeName() string {
return "DataCursor"
}
@@ -62,7 +66,7 @@ func (dc *dataCursor) String() string {
}
func (dc *dataCursor) HasOperation(name string) (exists bool) {
exists = name == indexName
exists = name == IndexName
if !exists {
f, ok := dc.ds[name]
exists = ok && isFunctor(f)
@@ -71,7 +75,7 @@ func (dc *dataCursor) HasOperation(name string) (exists bool) {
}
func (dc *dataCursor) CallOperation(name string, args []any) (value any, err error) {
if name == indexName {
if name == IndexName {
value = int64(dc.Index())
} else if functor, ok := dc.ds[name]; ok && isFunctor(functor) {
if functor == dc.cleanFunc {
@@ -93,7 +97,7 @@ func (dc *dataCursor) Reset() (success bool, err error) {
if dc.resetFunc != nil {
if dc.resource != nil {
ctx := cloneContext(dc.ctx)
if _, err = dc.resetFunc.Invoke(ctx, resetName, []any{dc.resource}); err == nil {
if _, err = dc.resetFunc.Invoke(ctx, ResetName, []any{dc.resource}); err == nil {
dc.index = -1
}
exportObjects(dc.ctx, ctx)
@@ -101,7 +105,7 @@ func (dc *dataCursor) Reset() (success bool, err error) {
err = errInvalidDataSource()
}
} else {
err = errNoOperation(resetName)
err = errNoOperation(ResetName)
}
success = err == nil
return
@@ -111,7 +115,7 @@ func (dc *dataCursor) Clean() (success bool, err error) {
if dc.cleanFunc != nil {
if dc.resource != nil {
ctx := cloneContext(dc.ctx)
_, err = dc.cleanFunc.Invoke(ctx, cleanName, []any{dc.resource})
_, err = dc.cleanFunc.Invoke(ctx, CleanName, []any{dc.resource})
dc.resource = nil
exportObjects(dc.ctx, ctx)
} else {
@@ -126,7 +130,7 @@ func (dc *dataCursor) Clean() (success bool, err error) {
func (dc *dataCursor) Current() (item any, err error) { // must return io.EOF at the last item
ctx := cloneContext(dc.ctx)
if item, err = dc.currentFunc.Invoke(ctx, currentName, []any{}); err == nil && item == nil {
if item, err = dc.currentFunc.Invoke(ctx, CurrentName, []any{}); err == nil && item == nil {
err = io.EOF
}
exportObjects(dc.ctx, ctx)
@@ -167,7 +171,7 @@ func (dc *dataCursor) checkFilter(filter Functor, item any) (accepted bool, err
var v any
var ok bool
ctx := cloneContext(dc.ctx)
if v, err = filter.Invoke(ctx, filterName, []any{item, dc.index}); err == nil && v != nil {
if v, err = filter.Invoke(ctx, FilterName, []any{item, dc.index}); err == nil && v != nil {
if accepted, ok = v.(bool); !ok {
accepted = true // NOTE: A non-boolean value that is not nil means the item has been accepted
}
@@ -177,19 +181,19 @@ func (dc *dataCursor) checkFilter(filter Functor, item any) (accepted bool, err
}
func (dc *dataCursor) mapItem(mapper Functor, item any) (mappedItem any, err error) {
ctx := cloneContext(dc.ctx)
mappedItem, err = mapper.Invoke(ctx, mapName, []any{item, dc.index});
mappedItem, err = mapper.Invoke(ctx, MapName, []any{item, dc.index});
return
}
func (dc *dataCursor) Next() (item any, err error) { // must return io.EOF after the last item
var accepted bool
if dc.resource != nil {
filter := dc.ds[filterName]
mapper := dc.ds[mapName]
filter := dc.ds[FilterName]
mapper := dc.ds[MapName]
for item == nil && err == nil {
ctx := cloneContext(dc.ctx)
if item, err = dc.nextFunc.Invoke(ctx, nextName, []any{dc.resource}); err == nil {
if item, err = dc.nextFunc.Invoke(ctx, NextName, []any{dc.resource}); err == nil {
if item == nil {
err = io.EOF
} else {