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      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 
     29 namespace aapt {
     30 
     31 struct DiagMessageActual {
     32     Source source;
     33     std::string message;
     34 };
     35 
     36 struct DiagMessage {
     37 private:
     38     Source mSource;
     39     std::stringstream mMessage;
     40 
     41 public:
     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 
     64 struct 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 
     91 class StdErrDiagnostics : public IDiagnostics {
     92 public:
     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 
    122 private:
    123     size_t mNumErrors = 0;
    124 
    125     DISALLOW_COPY_AND_ASSIGN(StdErrDiagnostics);
    126 };
    127 
    128 class SourcePathDiagnostics : public IDiagnostics {
    129 public:
    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 
    138 private:
    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