Merge branch 'develop' of https://github.com/nlohmann/json into diagnostics

README.md

@@ -577,7 +577,7 @@ j[1] = 42;
 bool foo = j.at(2);
 
 // comparison
-j == "[\"foo\", 42, true]"_json;  // true
+j == "[\"foo\", 42, true, 1.78]"_json;  // true
 
 // other stuff
 j.size();     // 3 entries
@@ -1528,6 +1528,7 @@ I deeply appreciate the help of the following people.
 - [KonanM](https://github.com/KonanM) proposed an implementation for the `NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE`/`NLOHMANN_DEFINE_TYPE_INTRUSIVE` macros.
 - [Guillaume Racicot](https://github.com/gracicot) implemented `string_view` support and allowed C++20 support.
 - [Alex Reinking](https://github.com/alexreinking) improved CMake support for `FetchContent`.
+- [Hannes Domani](https://github.com/ssbssa) provided a GDB pretty printer.
 
 Thanks a lot for helping out! Please [let me know](mailto:mail@nlohmann.me) if I forgot someone.
 
@@ -1637,4 +1638,6 @@ In case you have downloaded the library rather than checked out the code via Git
 
 Some tests change the installed files and hence make the whole process not reproducible. Please execute `ctest -LE not_reproducible` to skip these tests. See [issue #2324](https://github.com/nlohmann/json/issues/2324) for more information.
 
+Note you need to call `cmake -LE "not_reproducible|git_required"` to exclude both labels. See [issue #2596](https://github.com/nlohmann/json/issues/2596) for more information.
+
 As Intel compilers use unsafe floating point optimization by default, the unit tests may fail. Use flag [`/fp:precise`](https://software.intel.com/content/www/us/en/develop/documentation/cpp-compiler-developer-guide-and-reference/top/compiler-reference/compiler-options/compiler-option-details/floating-point-options/fp-model-fp.html) then.

include/nlohmann/detail/conversions/to_chars.hpp

@@ -490,51 +490,49 @@ inline int find_largest_pow10(const std::uint32_t n, std::uint32_t& pow10)
         return 10;
     }
     // LCOV_EXCL_STOP
-    else if (n >= 100000000)
+    if (n >= 100000000)
     {
         pow10 = 100000000;
         return  9;
     }
-    else if (n >= 10000000)
+    if (n >= 10000000)
     {
         pow10 = 10000000;
         return  8;
     }
-    else if (n >= 1000000)
+    if (n >= 1000000)
     {
         pow10 = 1000000;
         return  7;
     }
-    else if (n >= 100000)
+    if (n >= 100000)
     {
         pow10 = 100000;
         return  6;
     }
-    else if (n >= 10000)
+    if (n >= 10000)
     {
         pow10 = 10000;
         return  5;
     }
-    else if (n >= 1000)
+    if (n >= 1000)
     {
         pow10 = 1000;
         return  4;
     }
-    else if (n >= 100)
+    if (n >= 100)
     {
         pow10 = 100;
         return  3;
     }
-    else if (n >= 10)
+    if (n >= 10)
     {
         pow10 = 10;
         return  2;
     }
-    else
-    {
-        pow10 = 1;
-        return 1;
-    }
+
+    pow10 = 1;
+    return 1;
 }
 
 inline void grisu2_round(char* buf, int len, std::uint64_t dist, std::uint64_t delta,

include/nlohmann/detail/input/input_adapters.hpp

@@ -135,10 +135,8 @@ class iterator_input_adapter
             std::advance(current, 1);
             return result;
         }
-        else
-        {
-            return std::char_traits<char_type>::eof();
-        }
+
+        return std::char_traits<char_type>::eof();
     }
 
   private:

include/nlohmann/detail/input/parser.hpp

@@ -386,8 +386,9 @@ class parser
                                         m_lexer.get_token_string(),
                                         parse_error::create(101, m_lexer.get_position(), exception_message(token_type::end_array, "array"), BasicJsonType()));
             }
-            else  // object
-            {
+
+            // states.back() is false -> object
+
                 // comma -> next value
                 if (get_token() == token_type::value_separator)
                 {
@@ -397,12 +398,12 @@ class parser
                         return sax->parse_error(m_lexer.get_position(),
                                                 m_lexer.get_token_string(),
                                                 parse_error::create(101, m_lexer.get_position(), exception_message(token_type::value_string, "object key"), BasicJsonType()));
-                    }
+                }
 
-                    if (JSON_HEDLEY_UNLIKELY(!sax->key(m_lexer.get_string())))
-                    {
-                        return false;
-                    }
+                if (JSON_HEDLEY_UNLIKELY(!sax->key(m_lexer.get_string())))
+                {
+                    return false;
+                }
 
                     // parse separator (:)
                     if (JSON_HEDLEY_UNLIKELY(get_token() != token_type::name_separator))
@@ -410,35 +411,34 @@ class parser
                         return sax->parse_error(m_lexer.get_position(),
                                                 m_lexer.get_token_string(),
                                                 parse_error::create(101, m_lexer.get_position(), exception_message(token_type::name_separator, "object separator"), BasicJsonType()));
-                    }
-
-                    // parse values
-                    get_token();
-                    continue;
                 }
 
-                // closing }
-                if (JSON_HEDLEY_LIKELY(last_token == token_type::end_object))
-                {
-                    if (JSON_HEDLEY_UNLIKELY(!sax->end_object()))
-                    {
-                        return false;
-                    }
+                // parse values
+                get_token();
+                continue;
+            }
 
-                    // We are done with this object. Before we can parse a
-                    // new value, we need to evaluate the new state first.
-                    // By setting skip_to_state_evaluation to false, we
-                    // are effectively jumping to the beginning of this if.
-                    JSON_ASSERT(!states.empty());
-                    states.pop_back();
-                    skip_to_state_evaluation = true;
-                    continue;
+            // closing }
+            if (JSON_HEDLEY_LIKELY(last_token == token_type::end_object))
+            {
+                if (JSON_HEDLEY_UNLIKELY(!sax->end_object()))
+                {
+                    return false;
                 }
 
+                // We are done with this object. Before we can parse a
+                // new value, we need to evaluate the new state first.
+                // By setting skip_to_state_evaluation to false, we
+                // are effectively jumping to the beginning of this if.
+                JSON_ASSERT(!states.empty());
+                states.pop_back();
+                skip_to_state_evaluation = true;
+                continue;
+            }
+
                 return sax->parse_error(m_lexer.get_position(),
                                         m_lexer.get_token_string(),
                                         parse_error::create(101, m_lexer.get_position(), exception_message(token_type::end_object, "object"), BasicJsonType()));
-            }
         }
     }
 

include/nlohmann/detail/iterators/iteration_proxy.hpp

@@ -39,7 +39,7 @@ template<typename IteratorType> class iteration_proxy_value
     /// a string representation of the array index
     mutable string_type array_index_str = "0";
     /// an empty string (to return a reference for primitive values)
-    const string_type empty_str = "";
+    const string_type empty_str{};
 
   public:
     explicit iteration_proxy_value(IteratorType it) noexcept : anchor(it) {}

test/cmake_fetch_content/CMakeLists.txt

@@ -11,12 +11,10 @@ if (${CMAKE_VERSION} VERSION_GREATER "3.11.0")
   )
   set_tests_properties(cmake_fetch_content_configure PROPERTIES
     FIXTURES_SETUP cmake_fetch_content
-    LABELS git_required
-    LABELS not_reproducible
+    LABELS "git_required;not_reproducible"
   )
   set_tests_properties(cmake_fetch_content_build PROPERTIES
     FIXTURES_REQUIRED cmake_fetch_content
-    LABELS git_required
-    LABELS not_reproducible
+    LABELS "git_required;not_reproducible"
   )
 endif()

third_party/gdb_pretty_printer/README.md

+# GDB Pretty Printer
+
+File [nlohmann-json.py](nlohmann-json.py) contains a pretty printer for GDB for JSON values of this library. It was originally published as [Gist](https://gist.github.com/ssbssa/60da5339c6e6036b2afce17de06050ea#file-nlohmann-json-py) by [Hannes Domani](https://github.com/ssbssa).
+
+## How to use
+
+- Add line
+  
+  ```
+  source /path/to/nlohmann-json.py
+  ```
+  
+  to `~/.gdbinit`. Note you must replace `/path/to` with whatever path you stored file `nlohmann-json.py`.
+- In GDB, debug as usual. When you want to pretty-print a JSON value `var`, type
+  
+  ```
+  p -pretty on -array on -- var
+  ```
+  
+  The result should look like
+  
+  ```
+    $1 = std::map with 5 elements = {
+        ["Baptiste"] = std::map with 1 element = {
+            ["first"] = "second"
+        },
+        ["Emmanuel"] = std::vector of length 3, capacity 3 = {
+            3,
+            "25",
+            0.5
+        },
+        ["Jean"] = 0.7,
+        ["Zorg"] = std::map with 8 elements = {
+            ["array"] = std::vector of length 3, capacity 3 = {
+                1,
+                0,
+                2
+            },
+            ["awesome_str"] = "bleh",
+            ["bool"] = true,
+            ["flex"] = 0.2,
+            ["float"] = 5.22,
+            ["int"] = 5,
+            ["nested"] = std::map with 1 element = {
+                ["bar"] = "barz"
+            },
+            ["trap "] = "you fell"
+        },
+        ["empty"] = nlohmann::detail::value_t::null
+    }
+    ```
+
+Tested with GDB 9.2. See [#1952](https://github.com/nlohmann/json/issues/1952) for more information. Please post questions there.
+
+## Copyright
+
+MIT License
+
+Copyright (C) 2020 [Hannes Domani](https://github.com/ssbssa)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

third_party/gdb_pretty_printer/nlohmann-json.py

+import gdb
+import re
+
+class JsonValuePrinter:
+    "Print a json-value"
+
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        if self.val.type.strip_typedefs().code == gdb.TYPE_CODE_FLT:
+            return ("%.6f" % float(self.val)).rstrip("0")
+        return self.val
+
+def json_lookup_function(val):
+    if re.search("^nlohmann::basic_json<.*>$", val.type.strip_typedefs().name):
+        t = str(val['m_type'])
+        if t.startswith("nlohmann::detail::value_t::"):
+            try:
+                union_val = val['m_value'][t[27:]]
+                if union_val.type.code == gdb.TYPE_CODE_PTR:
+                    return gdb.default_visualizer(union_val.dereference())
+                else:
+                    return JsonValuePrinter(union_val)
+            except:
+                return JsonValuePrinter(val['m_type'])
+
+gdb.pretty_printers.append(json_lookup_function)