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inline.go
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inline.go
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package celinlineconst
import (
"fmt"
exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
"google.golang.org/protobuf/proto"
)
func InlineConst(expr *exprpb.Expr, renames map[string]*exprpb.Expr_ConstExpr) (*exprpb.Expr, error) {
return ReplaceVariables(expr, renames, nil)
}
func ReplaceVariables(expr *exprpb.Expr, constRenames map[string]*exprpb.Expr_ConstExpr, aliases map[string]string) (*exprpb.Expr, error) {
if len(constRenames) == 0 && len(aliases) == 0 {
// No modifications.
return expr, nil
}
if expr == nil {
return nil, nil
}
switch e := expr.ExprKind.(type) {
case *exprpb.Expr_ConstExpr:
return expr, nil
case *exprpb.Expr_IdentExpr:
if constExpr, has := constRenames[e.IdentExpr.Name]; has {
return &exprpb.Expr{
Id: expr.Id,
ExprKind: constExpr,
}, nil
}
if alias, has := aliases[e.IdentExpr.Name]; has {
return &exprpb.Expr{
Id: expr.Id,
ExprKind: &exprpb.Expr_IdentExpr{
IdentExpr: &exprpb.Expr_Ident{
Name: alias,
},
},
}, nil
}
return expr, nil
case *exprpb.Expr_SelectExpr:
operand, err := ReplaceVariables(e.SelectExpr.Operand, constRenames, aliases)
if err != nil {
return nil, err
}
selectExpr := proto.Clone(e.SelectExpr).(*exprpb.Expr_Select)
selectExpr.Operand = operand
return &exprpb.Expr{
Id: expr.Id,
ExprKind: &exprpb.Expr_SelectExpr{
SelectExpr: selectExpr,
},
}, nil
case *exprpb.Expr_CallExpr:
exprCall := e.CallExpr
target, err := ReplaceVariables(exprCall.Target, constRenames, aliases)
if err != nil {
return nil, err
}
args := make([]*exprpb.Expr, 0, len(exprCall.Args))
for _, arg := range exprCall.Args {
argCopy, err := ReplaceVariables(arg, constRenames, aliases)
if err != nil {
return nil, err
}
args = append(args, argCopy)
}
exprCallCopy := proto.Clone(exprCall).(*exprpb.Expr_Call)
exprCallCopy.Target = target
exprCallCopy.Args = args
return &exprpb.Expr{
Id: expr.Id,
ExprKind: &exprpb.Expr_CallExpr{
CallExpr: exprCallCopy,
},
}, nil
case *exprpb.Expr_ListExpr:
elements := make([]*exprpb.Expr, 0, len(e.ListExpr.Elements))
for _, elem := range e.ListExpr.Elements {
elemCopy, err := ReplaceVariables(elem, constRenames, aliases)
if err != nil {
return nil, err
}
elements = append(elements, elemCopy)
}
return &exprpb.Expr{
Id: expr.Id,
ExprKind: &exprpb.Expr_ListExpr{
ListExpr: &exprpb.Expr_CreateList{
Elements: elements,
},
},
}, nil
case *exprpb.Expr_StructExpr:
entries := make([]*exprpb.Expr_CreateStruct_Entry, 0, len(e.StructExpr.Entries))
for _, entry := range e.StructExpr.Entries {
entryCopy := proto.Clone(entry).(*exprpb.Expr_CreateStruct_Entry)
value, err := ReplaceVariables(entry.Value, constRenames, aliases)
if err != nil {
return nil, err
}
entryCopy.Value = value
if mapKey, ok := entry.KeyKind.(*exprpb.Expr_CreateStruct_Entry_MapKey); ok {
mapKeyCopy, err := ReplaceVariables(mapKey.MapKey, constRenames, aliases)
if err != nil {
return nil, err
}
entryCopy.KeyKind = &exprpb.Expr_CreateStruct_Entry_MapKey{
MapKey: mapKeyCopy,
}
}
entries = append(entries, entryCopy)
}
createStruct := proto.Clone(e.StructExpr).(*exprpb.Expr_CreateStruct)
createStruct.Entries = entries
return &exprpb.Expr{
Id: expr.Id,
ExprKind: &exprpb.Expr_StructExpr{
StructExpr: createStruct,
},
}, nil
case *exprpb.Expr_ComprehensionExpr:
c := proto.Clone(e.ComprehensionExpr).(*exprpb.Expr_Comprehension)
var err error
c.IterRange, err = ReplaceVariables(c.IterRange, constRenames, aliases)
if err != nil {
return nil, err
}
c.AccuInit, err = ReplaceVariables(c.AccuInit, constRenames, aliases)
if err != nil {
return nil, err
}
c.LoopCondition, err = ReplaceVariables(c.LoopCondition, constRenames, aliases)
if err != nil {
return nil, err
}
c.LoopStep, err = ReplaceVariables(c.LoopStep, constRenames, aliases)
if err != nil {
return nil, err
}
c.Result, err = ReplaceVariables(c.Result, constRenames, aliases)
if err != nil {
return nil, err
}
return &exprpb.Expr{
Id: expr.Id,
ExprKind: &exprpb.Expr_ComprehensionExpr{
ComprehensionExpr: c,
},
}, nil
default:
return nil, fmt.Errorf("unknown expr type: %T", expr.ExprKind)
}
}