1  // Copyright (c) 2019-2025 Alpha-Delta Network Inc.
 2  // This file is part of the alphavm library.
 3  
 4  // Licensed under the Apache License, Version 2.0 (the "License");
 5  // you may not use this file except in compliance with the License.
 6  // You may obtain a copy of the License at:
 7  
 8  // http://www.apache.org/licenses/LICENSE-2.0
 9  
10  // Unless required by applicable law or agreed to in writing, software
11  // distributed under the License is distributed on an "AS IS" BASIS,
12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  // See the License for the specific language governing permissions and
14  // limitations under the License.
15  
16  use super::*;
17  
18  impl<N: Network> Plaintext<N> {
19      /// Returns the plaintext member from the given path.
20      pub fn find<A: Into<Access<N>> + Copy + Debug>(&self, path: &[A]) -> Result<Plaintext<N>> {
21          // Ensure the path is not empty.
22          ensure!(!path.is_empty(), "Attempted to find a member with an empty path.");
23  
24          match self {
25              // Halts if the value is not a struct.
26              Self::Literal(..) => bail!("'{self}' is not a struct"),
27              // Retrieve the value of the member (from the value).
28              Self::Struct(..) | Self::Array(..) => {
29                  // Initialize the plaintext starting from the top-level.
30                  let mut plaintext = self;
31  
32                  // Iterate through the path to retrieve the value.
33                  for access in path.iter() {
34                      let access = (*access).into();
35                      match (plaintext, access) {
36                          (Self::Struct(members, ..), Access::Member(identifier)) => {
37                              match members.get(&identifier) {
38                                  // Retrieve the member and update `plaintext` for the next iteration.
39                                  Some(member) => plaintext = member,
40                                  // Halts if the member does not exist.
41                                  None => bail!("Failed to locate member '{identifier}' in '{self}'"),
42                              }
43                          }
44                          (Self::Array(array, ..), Access::Index(index)) => {
45                              match array.get(*index as usize) {
46                                  // Retrieve the element and update `plaintext` for the next iteration.
47                                  Some(element) => plaintext = element,
48                                  // Halts if the index is out of bounds.
49                                  None => bail!("Index '{index}' for '{self}' is out of bounds"),
50                              }
51                          }
52                          _ => bail!("Invalid access `{access}` for `{plaintext}`"),
53                      }
54                  }
55  
56                  // Return the output.
57                  Ok(plaintext.clone())
58              }
59          }
60      }
61  }