Diagnostics.h revision a587065721053ad54e34f484868142407d59512d 
1/*
2 * Copyright (C) 2015 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#ifndef AAPT_DIAGNOSTICS_H
18#define AAPT_DIAGNOSTICS_H
19
20#include "Source.h"
21#include "util/StringPiece.h"
22#include "util/Util.h"
23
24#include <iostream>
25#include <sstream>
26#include <string>
27
28namespace aapt {
29
30struct DiagMessageActual {
31    Source source;
32    std::string message;
33};
34
35struct DiagMessage {
36private:
37    Source mSource;
38    std::stringstream mMessage;
39
40public:
41    DiagMessage() = default;
42
43    DiagMessage(const StringPiece& src) : mSource(src) {
44    }
45
46    DiagMessage(const Source& src) : mSource(src) {
47    }
48
49    template <typename T> DiagMessage& operator<<(const T& value) {
50        mMessage << value;
51        return *this;
52    }
53
54    DiagMessageActual build() const {
55        return DiagMessageActual{ mSource, mMessage.str() };
56    }
57};
58
59struct IDiagnostics {
60    virtual ~IDiagnostics() = default;
61
62    virtual void error(const DiagMessage& message) = 0;
63    virtual void warn(const DiagMessage& message) = 0;
64    virtual void note(const DiagMessage& message) = 0;
65};
66
67struct StdErrDiagnostics : public IDiagnostics {
68    size_t mNumErrors = 0;
69
70    void emit(const DiagMessage& msg, const char* tag) {
71        DiagMessageActual actual = msg.build();
72        if (!actual.source.path.empty()) {
73            std::cerr << actual.source << ": ";
74        }
75        std::cerr << tag << actual.message << "." << std::endl;
76    }
77
78    void error(const DiagMessage& msg) override {
79        if (mNumErrors < 20) {
80            emit(msg, "error: ");
81        }
82        mNumErrors++;
83    }
84
85    void warn(const DiagMessage& msg) override {
86        emit(msg, "warn: ");
87    }
88
89    void note(const DiagMessage& msg) override {
90        emit(msg, "note: ");
91    }
92};
93
94} // namespace aapt
95
96#endif /* AAPT_DIAGNOSTICS_H */
97