1/* Copyright 2018 Mozilla Foundation
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16use crate::{BinaryReader, FromReader, OperatorsReader, Result};
17use core::fmt;
18
19/// Represents an initialization expression.
20#[derive(Clone)]
21pub struct ConstExpr<'a> {
22 reader: BinaryReader<'a>,
23}
24
25impl PartialEq for ConstExpr<'_> {
26 fn eq(&self, other: &Self) -> bool {
27 self.reader.remaining_buffer() == other.reader.remaining_buffer()
28 }
29}
30
31impl Eq for ConstExpr<'_> {}
32
33impl<'a> ConstExpr<'a> {
34 /// Constructs a new `ConstExpr` from the given data and offset.
35 pub fn new(reader: BinaryReader<'a>) -> ConstExpr<'a> {
36 ConstExpr { reader }
37 }
38
39 /// Gets a binary reader for the initialization expression.
40 pub fn get_binary_reader(&self) -> BinaryReader<'a> {
41 self.reader.clone()
42 }
43
44 /// Gets an operators reader for the initialization expression.
45 pub fn get_operators_reader(&self) -> OperatorsReader<'a> {
46 OperatorsReader::new(self.get_binary_reader())
47 }
48}
49
50impl<'a> FromReader<'a> for ConstExpr<'a> {
51 fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self> {
52 // FIXME(#188) ideally shouldn't need to skip here
53 let reader: BinaryReader<'a> = reader.skip(|r: &mut BinaryReader<'a>| r.skip_const_expr())?;
54 Ok(ConstExpr { reader })
55 }
56}
57
58impl fmt::Debug for ConstExpr<'_> {
59 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
60 f&mut DebugStruct<'_, '_>.debug_struct("ConstExpr")
61 .field("offset", &self.reader.original_position())
62 .field(name:"data", &self.reader.remaining_buffer())
63 .finish()
64 }
65}
66