tools/gn/err.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef TOOLS_GN_ERR_H_
   6 #define TOOLS_GN_ERR_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "tools/gn/location.h"
  12 #include "tools/gn/token.h"
  13
  14 class ParseNode;
  15 class Value;
  16
  17 // Result of doing some operation. Check has_error() to see if an error
  18 // occurred.
  19 //
  20 // An error has a location and a message. Below that, is some optional help
  21 // text to go with the annotation of the location.
  22 //
  23 // An error can also have sub-errors which are additionally printed out
  24 // below. They can provide additional context.
  25 class Err {
  26  public:
  27   typedef std::vector<LocationRange> RangeList;
  28
  29   // Indicates no error.
  30   Err();
  31
  32   // Error at a single point.
  33   Err(const Location& location,
  34       const std::string& msg,
  35       const std::string& help = std::string());
  36
  37   // Error at a given range.
  38   Err(const LocationRange& range,
  39       const std::string& msg,
  40       const std::string& help = std::string());
  41
  42   // Error at a given token.
  43   Err(const Token& token,
  44       const std::string& msg,
  45       const std::string& help_text = std::string());
  46
  47   // Error at a given node.
  48   Err(const ParseNode* node,
  49       const std::string& msg,
  50       const std::string& help_text = std::string());
  51
  52   // Error at a given value.
  53   Err(const Value& value,
  54       const std::string msg,
  55       const std::string& help_text = std::string());
  56
  57   ~Err();
  58
  59   bool has_error() const { return has_error_; }
  60   const Location& location() const { return location_; }
  61   const std::string& message() const { return message_; }
  62   const std::string& help_text() const { return help_text_; }
  63
  64   void AppendRange(const LocationRange& range) { ranges_.push_back(range); }
  65   const RangeList& ranges() const { return ranges_; }
  66
  67   void AppendSubErr(const Err& err);
  68
  69   void PrintToStdout() const;
  70
  71  private:
  72   void InternalPrintToStdout(bool is_sub_err) const;
  73
  74   bool has_error_;
  75   Location location_;
  76
  77   std::vector<LocationRange> ranges_;
  78
  79   std::string message_;
  80   std::string help_text_;
  81
  82   std::vector<Err> sub_errs_;
  83 };
  84
  85 #endif  // TOOLS_GN_ERR_H_