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      1 //
      2 // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
      3 // Use of this source code is governed by a BSD-style license that can be
      4 // found in the LICENSE file.
      5 //
      6 
      7 #ifndef _INFOSINK_INCLUDED_
      8 #define _INFOSINK_INCLUDED_
      9 
     10 #include <math.h>
     11 #include "compiler/Common.h"
     12 
     13 // Returns the fractional part of the given floating-point number.
     14 inline float fractionalPart(float f) {
     15   float intPart = 0.0f;
     16   return modff(f, &intPart);
     17 }
     18 
     19 //
     20 // TPrefixType is used to centralize how info log messages start.
     21 // See below.
     22 //
     23 enum TPrefixType {
     24     EPrefixNone,
     25     EPrefixWarning,
     26     EPrefixError,
     27     EPrefixInternalError,
     28     EPrefixUnimplemented,
     29     EPrefixNote
     30 };
     31 
     32 //
     33 // Encapsulate info logs for all objects that have them.
     34 //
     35 // The methods are a general set of tools for getting a variety of
     36 // messages and types inserted into the log.
     37 //
     38 class TInfoSinkBase {
     39 public:
     40     TInfoSinkBase() {}
     41 
     42     template <typename T>
     43     TInfoSinkBase& operator<<(const T& t) {
     44         TPersistStringStream stream;
     45         stream << t;
     46         sink.append(stream.str());
     47         return *this;
     48     }
     49     // Override << operator for specific types. It is faster to append strings
     50     // and characters directly to the sink.
     51     TInfoSinkBase& operator<<(char c) {
     52         sink.append(1, c);
     53         return *this;
     54     }
     55     TInfoSinkBase& operator<<(const char* str) {
     56         sink.append(str);
     57         return *this;
     58     }
     59     TInfoSinkBase& operator<<(const TPersistString& str) {
     60         sink.append(str);
     61         return *this;
     62     }
     63     TInfoSinkBase& operator<<(const TString& str) {
     64         sink.append(str.c_str());
     65         return *this;
     66     }
     67     // Make sure floats are written with correct precision.
     68     TInfoSinkBase& operator<<(float f) {
     69         // Make sure that at least one decimal point is written. If a number
     70         // does not have a fractional part, the default precision format does
     71         // not write the decimal portion which gets interpreted as integer by
     72         // the compiler.
     73         TPersistStringStream stream;
     74         if (fractionalPart(f) == 0.0f) {
     75             stream.precision(1);
     76             stream << std::showpoint << std::fixed << f;
     77         } else {
     78             stream.unsetf(std::ios::fixed);
     79             stream.unsetf(std::ios::scientific);
     80             stream.precision(8);
     81             stream << f;
     82         }
     83         sink.append(stream.str());
     84         return *this;
     85     }
     86     // Write boolean values as their names instead of integral value.
     87     TInfoSinkBase& operator<<(bool b) {
     88         const char* str = b ? "true" : "false";
     89         sink.append(str);
     90         return *this;
     91     }
     92 
     93     void erase() { sink.clear(); }
     94     int size() { return static_cast<int>(sink.size()); }
     95 
     96     const TPersistString& str() const { return sink; }
     97     const char* c_str() const { return sink.c_str(); }
     98 
     99     void prefix(TPrefixType message);
    100     void location(TSourceLoc loc);
    101     void message(TPrefixType message, const char* s);
    102     void message(TPrefixType message, const char* s, TSourceLoc loc);
    103 
    104 private:
    105     TPersistString sink;
    106 };
    107 
    108 class TInfoSink {
    109 public:
    110     TInfoSinkBase info;
    111     TInfoSinkBase debug;
    112     TInfoSinkBase obj;
    113 };
    114 
    115 #endif // _INFOSINK_INCLUDED_
    116