Source/cmJSONState.h

   1 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   2    file Copyright.txt or https://cmake.org/licensing for details.  */
   3 #pragma once
   4
   5 #include "cmConfigure.h" // IWYU pragma: keep
   6
   7 #include <cstddef>
   8 #include <string>
   9 #include <utility>
  10 #include <vector>
  11
  12 #include "cmStringAlgorithms.h"
  13
  14 namespace Json {
  15 class Value;
  16 }
  17
  18 class cmJSONState
  19 {
  20   using Location = struct
  21   {
  22     int line;
  23     int column;
  24   };
  25
  26 public:
  27   using JsonPair = std::pair<const std::string, const Json::Value*>;
  28   cmJSONState() = default;
  29   cmJSONState(const std::string& filename, Json::Value* root);
  30   void AddError(std::string const& errMsg);
  31   void AddErrorAtValue(std::string const& errMsg, const Json::Value* value);
  32   void AddErrorAtOffset(std::string const& errMsg, std::ptrdiff_t offset);
  33   std::string GetErrorMessage(bool showContext = true);
  34   std::string key();
  35   std::string key_after(std::string const& key);
  36   const Json::Value* value_after(std::string const& key);
  37   void push_stack(std::string const& key, const Json::Value* value);
  38   void pop_stack();
  39
  40   class Error
  41   {
  42   public:
  43     Error(Location loc, std::string errMsg)
  44       : location(loc)
  45       , message(std::move(errMsg)){};
  46     Error(std::string errMsg)
  47       : location({ -1, -1 })
  48       , message(std::move(errMsg)){};
  49     std::string GetErrorMessage() const
  50     {
  51       std::string output = message;
  52       if (location.line > 0) {
  53         output = cmStrCat("Error: @", location.line, ",", location.column,
  54                           ": ", output);
  55       }
  56       return output;
  57     }
  58     Location GetLocation() const { return location; }
  59
  60   private:
  61     Location location;
  62     std::string message;
  63   };
  64
  65   std::vector<JsonPair> parseStack;
  66   std::vector<Error> errors;
  67   std::string doc;
  68   bool allowComments = false;
  69
  70 private:
  71   std::string GetJsonContext(Location loc);
  72   Location LocateInDocument(ptrdiff_t offset);
  73 };