1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include <algorithm>
  27 
  28 #include "ErrorHandling.h"
  29 #include "Log.h"
  30 
  31 
  32 namespace {
  33 
  34 tstring getFilename(const SourceCodePos& pos) {
  35     const std::string buf(pos.file);
  36     const std::string::size_type idx = buf.find_last_of("\\/");
  37     if (idx == std::string::npos) {
  38         return tstrings::fromUtf8(buf);
  39     }
  40     return tstrings::fromUtf8(buf.substr(idx + 1));
  41 }
  42 
  43 void reportError(const SourceCodePos& pos, const tstring& msg) {
  44     Logger::defaultLogger().log(Logger::LOG_ERROR, getFilename(pos).c_str(),
  45         pos.lno, tstrings::fromUtf8(pos.func).c_str(), msg);
  46 }
  47 
  48 } // namespace
  49 
  50 void reportError(const SourceCodePos& pos, const std::exception& e) {
  51     reportError(pos, (tstrings::any() << "Exception with message \'"
  52                                         << e.what() << "\' caught").tstr());
  53 }
  54 
  55 
  56 void reportUnknownError(const SourceCodePos& pos) {
  57     reportError(pos, _T("Unknown exception caught"));
  58 }
  59 
  60 
  61 std::string makeMessage(const std::exception& e, const SourceCodePos& pos) {
  62     std::ostringstream printer;
  63     printer << getFilename(pos) << "(" << pos.lno << ") at "
  64             << pos.func << "(): "
  65             << e.what();
  66     return printer.str();
  67 }
  68 
  69 
  70 namespace {
  71 
  72 bool isNotSpace(int chr) {
  73     return isspace(chr) == 0;
  74 }
  75 
  76 
  77 enum TrimMode {
  78     TrimLeading = 0x10,
  79     TrimTrailing = 0x20,
  80     TrimBoth = TrimLeading | TrimTrailing
  81 };
  82 
  83 // Returns position of the last printed character in the given string.
  84 // Returns std::string::npos if nothing was printed.
  85 size_t printWithoutWhitespaces(std::ostream& out, const std::string& str,
  86                                                             TrimMode mode) {
  87     std::string::const_reverse_iterator it = str.rbegin();
  88     std::string::const_reverse_iterator end = str.rend();
  89 
  90     if (mode & TrimLeading) {
  91         // skip leading whitespace
  92         std::string::const_iterator entry = std::find_if(str.begin(),
  93                                                 str.end(), isNotSpace);
  94         end = std::string::const_reverse_iterator(entry);
  95     }
  96 
  97     if (mode & TrimTrailing) {
  98         // skip trailing whitespace
  99         it = std::find_if(it, end, isNotSpace);
 100     }
 101 
 102     if (it == end) {
 103         return std::string::npos;
 104     }
 105 
 106     const size_t pos = str.rend() - end;
 107     const size_t len = end - it;
 108     out.write(str.c_str() + pos, len);
 109     return pos + len - 1;
 110 }
 111 
 112 } // namespace
 113 
 114 std::string joinErrorMessages(const std::string& a, const std::string& b) {
 115     const std::string endPhraseChars(";.,:!?");
 116     const std::string space(" ");
 117     const std::string dotAndSpace(". ");
 118 
 119     std::ostringstream printer;
 120     printer.exceptions(std::ios::failbit | std::ios::badbit);
 121 
 122     size_t idx = printWithoutWhitespaces(printer, a, TrimTrailing);
 123     size_t extra = 0;
 124     if (idx < a.size() && endPhraseChars.find(a[idx]) == std::string::npos) {
 125         printer << dotAndSpace;
 126         extra = dotAndSpace.size();
 127     } else if (idx != std::string::npos) {
 128         printer << space;
 129         extra = space.size();
 130     }
 131 
 132     idx = printWithoutWhitespaces(printer, b, TrimBoth);
 133 
 134     const std::string str = printer.str();
 135 
 136     if (std::string::npos == idx && extra) {
 137         // Nothing printed from the 'b' message. Backout delimiter string.
 138         return str.substr(0, str.size() - extra);
 139     }
 140     return str;
 141 }