1 /**********************************************************************
2
3 Audacity: A Digital Audio Editor
4
5 XMLMethodRegistry.cpp
6
7 Paul Licameli
8
9 **********************************************************************/
10
11 #include "XMLMethodRegistry.h"
12
13 #include "Identifier.h"
14 #include <wx/string.h>
15
16 XMLMethodRegistryBase::XMLMethodRegistryBase() = default;
17 XMLMethodRegistryBase::~XMLMethodRegistryBase() = default;
18
Register(std::string tag,TypeErasedObjectAccessor accessor)19 void XMLMethodRegistryBase::Register(
20 std::string tag, TypeErasedObjectAccessor accessor )
21 {
22 // Store string in a separate container from the map, so the map
23 // can be keyed by string_view.
24 // Beware small-string optimization! Be sure strings don't relocate for
25 // growth of the container. Use a list, not a vector.
26 auto &newtag = mTags.emplace_front(move(tag));
27 mTagTable[ newtag ] = move( accessor );
28 }
29
CallObjectAccessor(const std::string_view & tag,void * p)30 XMLTagHandler *XMLMethodRegistryBase::CallObjectAccessor(
31 const std::string_view &tag, void *p )
32 {
33 const auto &table = mTagTable;
34 if (auto iter = table.find( tag ); iter != table.end())
35 if (auto &fn = iter->second)
36 return fn( p );
37 return nullptr;
38 }
39
PushAccessor(TypeErasedAccessor accessor)40 void XMLMethodRegistryBase::PushAccessor( TypeErasedAccessor accessor )
41 {
42 mAccessors.emplace_back( move( accessor ) );
43 }
44
Register(std::string tag,TypeErasedMutator mutator)45 void XMLMethodRegistryBase::Register(
46 std::string tag, TypeErasedMutator mutator )
47 {
48 // Similar to the other overload of Register
49 auto &newtag = mMutatorTags.emplace_front(move(tag));
50 mMutatorTable[ newtag ] = { mAccessors.size() - 1, move( mutator ) };
51 }
52
CallAttributeHandler(const std::string_view & tag,void * p,const XMLAttributeValueView & value)53 bool XMLMethodRegistryBase::CallAttributeHandler( const std::string_view &tag,
54 void *p, const XMLAttributeValueView &value )
55 {
56 const auto &table = mMutatorTable;
57 if (auto iter = table.find(tag); iter != table.end())
58 // Tag is known
59 if (auto &pair = iter->second;
60 pair.second && pair.first < mAccessors.size() )
61 // Mutator is not null and accessor exists
62 if (auto &accessor = mAccessors[pair.first])
63 // Accessor is not null; compose accessor and mutator
64 return pair.second( accessor( p ), value ), true;
65 return false;
66 }
67
RegisterAttributeWriter(TypeErasedWriter writer)68 void XMLMethodRegistryBase::RegisterAttributeWriter( TypeErasedWriter writer )
69 {
70 mAttributeWriterTable.emplace_back( move( writer ) );
71 }
72
CallAttributeWriters(const void * p,XMLWriter & writer)73 void XMLMethodRegistryBase::CallAttributeWriters(
74 const void *p, XMLWriter &writer )
75 {
76 const auto &table = mAttributeWriterTable;
77 for ( auto &fn : table )
78 if (fn)
79 fn( p, writer );
80 }
81
RegisterObjectWriter(TypeErasedWriter writer)82 void XMLMethodRegistryBase::RegisterObjectWriter( TypeErasedWriter writer )
83 {
84 mObjectWriterTable.emplace_back( move( writer ) );
85 }
86
CallObjectWriters(const void * p,XMLWriter & writer)87 void XMLMethodRegistryBase::CallObjectWriters(
88 const void *p, XMLWriter &writer )
89 {
90 const auto &table = mObjectWriterTable;
91 for ( auto &fn : table )
92 if (fn)
93 fn( p, writer );
94 }
95