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🚸 add GDB pretty printer
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@ -1528,6 +1528,7 @@ I deeply appreciate the help of the following people.
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- [KonanM](https://github.com/KonanM) proposed an implementation for the `NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE`/`NLOHMANN_DEFINE_TYPE_INTRUSIVE` macros.
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- [Guillaume Racicot](https://github.com/gracicot) implemented `string_view` support and allowed C++20 support.
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- [Alex Reinking](https://github.com/alexreinking) improved CMake support for `FetchContent`.
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- [Hannes Domani](https://github.com/ssbssa) provided a GDB pretty printer.
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Thanks a lot for helping out! Please [let me know](mailto:mail@nlohmann.me) if I forgot someone.
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77
third_party/gdb_pretty_printer/README.md
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third_party/gdb_pretty_printer/README.md
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# GDB Pretty Printer
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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).
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## How to use
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- Add line
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```
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source /path/to/nlohmann-json.py
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```
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to `~/.gdbinit`. Note you must replace `/path/to` with whatever path you stored file `nlohmann-json.py`.
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- In GDB, debug as usual. When you want to pretty-print a JSON value `var`, type
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```
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p -pretty on -array on -- var
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```
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The result should look like
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```
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$1 = std::map with 5 elements = {
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["Baptiste"] = std::map with 1 element = {
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["first"] = "second"
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},
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["Emmanuel"] = std::vector of length 3, capacity 3 = {
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3,
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"25",
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0.5
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},
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["Jean"] = 0.7,
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["Zorg"] = std::map with 8 elements = {
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["array"] = std::vector of length 3, capacity 3 = {
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1,
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0,
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2
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},
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["awesome_str"] = "bleh",
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["bool"] = true,
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["flex"] = 0.2,
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["float"] = 5.22,
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["int"] = 5,
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["nested"] = std::map with 1 element = {
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["bar"] = "barz"
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},
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["trap "] = "you fell"
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},
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["empty"] = nlohmann::detail::value_t::null
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}
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```
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Tested with GDB 9.2. See [#1952](https://github.com/nlohmann/json/issues/1952) for more information. Please post questions there.
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## Copyright
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MIT License
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Copyright (C) 2020 [Hannes Domani](https://github.com/ssbssa)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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third_party/gdb_pretty_printer/nlohmann-json.py
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third_party/gdb_pretty_printer/nlohmann-json.py
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import gdb
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import re
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class JsonValuePrinter:
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"Print a json-value"
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def __init__(self, val):
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self.val = val
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def to_string(self):
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if self.val.type.strip_typedefs().code == gdb.TYPE_CODE_FLT:
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return ("%.6f" % float(self.val)).rstrip("0")
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return self.val
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def json_lookup_function(val):
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if re.search("^nlohmann::basic_json<.*>$", val.type.strip_typedefs().name):
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t = str(val['m_type'])
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if t.startswith("nlohmann::detail::value_t::"):
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try:
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union_val = val['m_value'][t[27:]]
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if union_val.type.code == gdb.TYPE_CODE_PTR:
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return gdb.default_visualizer(union_val.dereference())
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else:
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return JsonValuePrinter(union_val)
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except:
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return JsonValuePrinter(val['m_type'])
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gdb.pretty_printers.append(json_lookup_function)
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