1 /*
2 * Copyright 2019 The Android Open Source Project
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
17 #include "enum_gen.h"
18
19 #include <iostream>
20
21 #include "util.h"
22
EnumGen(EnumDef e)23 EnumGen::EnumGen(EnumDef e) : e_(std::move(e)) {}
24
GenDefinition(std::ostream & stream)25 void EnumGen::GenDefinition(std::ostream& stream) {
26 stream << "enum class ";
27 stream << e_.name_;
28 stream << " : " << util::GetTypeForSize(e_.size_);
29 stream << " {";
30 for (const auto& pair : e_.constants_) {
31 stream << pair.second << " = 0x" << std::hex << pair.first << std::dec << ",";
32 }
33 stream << "};\n";
34 }
35
GenDefinitionPybind11(std::ostream & stream)36 void EnumGen::GenDefinitionPybind11(std::ostream& stream) {
37 stream << "py::enum_<" << e_.name_ << ">(m, \"" << e_.name_ << "\")";
38 for (const auto& pair : e_.constants_) {
39 stream << ".value(\"" << pair.second << "\", " << e_.name_ << "::" << pair.second << ")";
40 }
41 stream << ";\n";
42 }
43
GenLogging(std::ostream & stream)44 void EnumGen::GenLogging(std::ostream& stream) {
45 // Print out the switch statement that converts all the constants to strings.
46 stream << "inline std::string " << e_.name_ << "Text(const " << e_.name_ << "& param) {";
47 stream << "switch (param) {";
48 for (const auto& pair : e_.constants_) {
49 stream << "case " << e_.name_ << "::" << pair.second << ":";
50 stream << " return \"" << pair.second << "\";";
51 }
52 stream << "default:";
53 stream << " return std::string(\"Unknown " << e_.name_ << ": \") + std::to_string(static_cast<int>(param));";
54 stream << "}";
55 stream << "}\n\n";
56
57 // Print out the stream operator so that the constant can be written to streams.
58 stream << "inline std::ostream& operator<<(std::ostream& os, const " << e_.name_ << "& param) {";
59 stream << " return os << " << e_.name_ << "Text(param);";
60 stream << "}\n";
61 }
62
GenRustDef(std::ostream & stream)63 void EnumGen::GenRustDef(std::ostream& stream) {
64 stream << "#[derive(FromPrimitive, ToPrimitive, Debug, Hash, Eq, PartialEq, Clone, Copy)]\n";
65 stream << "#[repr(u64)]\n";
66 stream << "pub enum " << e_.name_ << " {";
67 for (const auto& pair : e_.constants_) {
68 stream << util::ConstantCaseToCamelCase(pair.second) << " = 0x" << std::hex << pair.first << std::dec << ",";
69 }
70 stream << "}";
71
72 stream << "impl fmt::Display for " << e_.name_ << " {";
73 stream << "fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {";
74 stream << "match self {";
75 for (const auto& pair : e_.constants_) {
76 stream << e_.name_ << "::" << util::ConstantCaseToCamelCase(pair.second) << " => "
77 << "write!(f, \"{:#0" << (util::RoundSizeUp(e_.size_) / 4) + 2 << "X} (" << pair.second << ")\", "
78 << "self.to_" << util::GetRustTypeForSize(e_.size_) << "().unwrap()),";
79 }
80 stream << "}}}\n";
81
82 if (e_.try_from_enum_ != nullptr) {
83 std::vector<std::string> other_items;
84 for (const auto& pair : e_.try_from_enum_->constants_) {
85 other_items.push_back(pair.second);
86 }
87 stream << "impl TryFrom<" << e_.try_from_enum_->name_ << "> for " << e_.name_ << " {";
88 stream << "type Error = &'static str;";
89 stream << "fn try_from(value: " << e_.try_from_enum_->name_ << ") -> std::result::Result<Self, Self::Error> {";
90 stream << "match value {";
91 for (const auto& pair : e_.constants_) {
92 if (std::find(other_items.begin(), other_items.end(), pair.second) == other_items.end()) {
93 continue;
94 }
95 auto constant_name = util::ConstantCaseToCamelCase(pair.second);
96 stream << e_.try_from_enum_->name_ << "::" << constant_name << " => Ok(" << e_.name_ << "::" << constant_name
97 << "),";
98 }
99 stream << "_ => Err(\"No mapping for provided key\"),";
100 stream << "}}}";
101 }
102 }
103