Shamelessly copy Josiah

source/lib/json/tools/generate_natvis/README.md

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+generate_natvis.py
+==================
+
+Generate the Natvis debugger visualization file for all supported namespace combinations.
+
+## Usage
+
+```
+./generate_natvis.py --version X.Y.Z output_directory/
+```

source/lib/json/tools/generate_natvis/generate_natvis.py

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+#!/usr/bin/env python3
+
+import argparse
+import itertools
+import jinja2
+import os
+import re
+import sys
+
+def semver(v):
+    if not re.fullmatch(r'\d+\.\d+\.\d+', v):
+        raise ValueError
+    return v
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--version', required=True, type=semver, help='Library version number')
+    parser.add_argument('output', help='Output directory for nlohmann_json.natvis')
+    args = parser.parse_args()
+
+    namespaces = ['nlohmann']
+    abi_prefix = 'json_abi'
+    abi_tags = ['_diag', '_ldvcmp']
+    version = '_v' + args.version.replace('.', '_')
+    inline_namespaces = []
+
+    # generate all combinations of inline namespace names
+    for n in range(0, len(abi_tags) + 1):
+        for tags in itertools.combinations(abi_tags, n):
+            ns = abi_prefix + ''.join(tags)
+            inline_namespaces += [ns, ns + version]
+
+    namespaces += [f'{namespaces[0]}::{ns}' for ns in inline_namespaces]
+
+    env = jinja2.Environment(loader=jinja2.FileSystemLoader(searchpath=sys.path[0]), autoescape=True, trim_blocks=True,
+                                                            lstrip_blocks=True, keep_trailing_newline=True)
+    template = env.get_template('nlohmann_json.natvis.j2')
+    natvis = template.render(namespaces=namespaces)
+
+    with open(os.path.join(args.output, 'nlohmann_json.natvis'), 'w') as f:
+        f.write(natvis)

source/lib/json/tools/generate_natvis/nlohmann_json.natvis.j2

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+<?xml version="1.0" encoding="utf-8"?>
+
+<!-- * * * * * * * * AUTO-GENERATED FILE  * * * * * * * * -->
+<!-- Edit ./tools/generate_natvis/nlohmann_json.natvis.j2 -->
+<!-- * * * * * * * * AUTO-GENERATED FILE  * * * * * * * * -->
+
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+{% for ns in namespaces %}
+    <!-- Namespace {{ ns }} -->
+    <Type Name="{{ ns }}::basic_json&lt;*&gt;">
+        <DisplayString Condition="m_type == {{ ns }}::detail::value_t::null">null</DisplayString>
+        <DisplayString Condition="m_type == {{ ns }}::detail::value_t::object">{*(m_value.object)}</DisplayString>
+        <DisplayString Condition="m_type == {{ ns }}::detail::value_t::array">{*(m_value.array)}</DisplayString>
+        <DisplayString Condition="m_type == {{ ns }}::detail::value_t::string">{*(m_value.string)}</DisplayString>
+        <DisplayString Condition="m_type == {{ ns }}::detail::value_t::boolean">{m_value.boolean}</DisplayString>
+        <DisplayString Condition="m_type == {{ ns }}::detail::value_t::number_integer">{m_value.number_integer}</DisplayString>
+        <DisplayString Condition="m_type == {{ ns }}::detail::value_t::number_unsigned">{m_value.number_unsigned}</DisplayString>
+        <DisplayString Condition="m_type == {{ ns }}::detail::value_t::number_float">{m_value.number_float}</DisplayString>
+        <DisplayString Condition="m_type == {{ ns }}::detail::value_t::discarded">discarded</DisplayString>
+        <Expand>
+            <ExpandedItem Condition="m_type == {{ ns }}::detail::value_t::object">
+                *(m_value.object),view(simple)
+            </ExpandedItem>
+            <ExpandedItem Condition="m_type == {{ ns }}::detail::value_t::array">
+                *(m_value.array),view(simple)
+            </ExpandedItem>
+        </Expand>
+    </Type>
+
+    <!-- Skip the pair first/second members in the treeview while traversing a map.
+         Only works in VS 2015 Update 2 and beyond using the new visualization -->
+    <Type Name="std::pair&lt;*, {{ ns }}::basic_json&lt;*&gt;&gt;" IncludeView="MapHelper">
+        <DisplayString>{second}</DisplayString>
+        <Expand>
+            <ExpandedItem>second</ExpandedItem>
+        </Expand>
+    </Type>
+
+{% endfor %}
+</AutoVisualizer>