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 <android-base/macros.h>
25#include <iostream>
26#include <sstream>
27#include <string>
28
29namespace aapt {
30
31struct DiagMessageActual {
32    Source source;
33    std::string message;
34};
35
36struct DiagMessage {
37private:
38    Source mSource;
39    std::stringstream mMessage;
40
41public:
42    DiagMessage() = default;
43
44    DiagMessage(const StringPiece& src) : mSource(src) {
45    }
46
47    DiagMessage(const Source& src) : mSource(src) {
48    }
49
50    DiagMessage(size_t line) : mSource(Source().withLine(line)) {
51    }
52
53    template <typename T>
54    DiagMessage& operator<<(const T& value) {
55        mMessage << value;
56        return *this;
57    }
58
59    DiagMessageActual build() const {
60        return DiagMessageActual{ mSource, mMessage.str() };
61    }
62};
63
64struct IDiagnostics {
65    virtual ~IDiagnostics() = default;
66
67    enum class Level {
68        Note,
69        Warn,
70        Error
71    };
72
73    virtual void log(Level level, DiagMessageActual& actualMsg) = 0;
74
75    virtual void error(const DiagMessage& message) {
76        DiagMessageActual actual = message.build();
77        log(Level::Error, actual);
78    }
79
80    virtual void warn(const DiagMessage& message) {
81        DiagMessageActual actual = message.build();
82        log(Level::Warn, actual);
83    }
84
85    virtual void note(const DiagMessage& message) {
86        DiagMessageActual actual = message.build();
87        log(Level::Note, actual);
88    }
89};
90
91class StdErrDiagnostics : public IDiagnostics {
92public:
93    StdErrDiagnostics() = default;
94
95    void log(Level level, DiagMessageActual& actualMsg) override {
96        const char* tag;
97
98        switch (level) {
99        case Level::Error:
100            mNumErrors++;
101            if (mNumErrors > 20) {
102                return;
103            }
104            tag = "error";
105            break;
106
107        case Level::Warn:
108            tag = "warn";
109            break;
110
111        case Level::Note:
112            tag = "note";
113            break;
114        }
115
116        if (!actualMsg.source.path.empty()) {
117            std::cerr << actualMsg.source << ": ";
118        }
119        std::cerr << tag << ": " << actualMsg.message << "." << std::endl;
120    }
121
122private:
123    size_t mNumErrors = 0;
124
125    DISALLOW_COPY_AND_ASSIGN(StdErrDiagnostics);
126};
127
128class SourcePathDiagnostics : public IDiagnostics {
129public:
130    SourcePathDiagnostics(const Source& src, IDiagnostics* diag) : mSource(src), mDiag(diag) {
131    }
132
133    void log(Level level, DiagMessageActual& actualMsg) override {
134        actualMsg.source.path = mSource.path;
135        mDiag->log(level, actualMsg);
136    }
137
138private:
139    Source mSource;
140    IDiagnostics* mDiag;
141
142    DISALLOW_COPY_AND_ASSIGN(SourcePathDiagnostics);
143};
144
145} // namespace aapt
146
147#endif /* AAPT_DIAGNOSTICS_H */
148