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TreeMutator: provide no-op implementation

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This commit is contained in:
Fischlurch 2018-10-12 01:07:13 +02:00
parent fb93e349da
commit 0d5f29446b
2 changed files with 40 additions and 15 deletions
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30
src/lib/diff/tree-mutator-noop-binding.hpp
View file

@ -70,18 +70,34 @@ namespace diff{
* Diff binding for black holes, happily accepting anything.
* @note absorbs and silently ignores any diff verb.
*/
template<class PAR>
class BlackHoleMutation
: public PAR
: public TreeMutator
{
public:
BlackHoleMutation (PAR&& chain)
: PAR{std::forward<PAR>(chain)}
{ }
BlackHoleMutation () = default;
/* ==== TreeMutator API ==== */
using Elm = GenNode const&;
using Buff = TreeMutator::Handle;
bool hasSrc() override { return true; } ///< always keen to do yet more
bool injectNew (Elm) override { return true; } ///< pretend to inject a new element
bool matchSrc (Elm) override { return true; } ///< purport suitable element is waiting
bool acceptSrc (Elm) override { return true; } ///< claim to handle any diff task
bool accept_until (Elm) override { return true; } ///< profess to forward anywhere
bool findSrc (Elm) override { return true; } ///< sham to find anything
bool assignElm (Elm) override { return true; } ///< accept any assignment
bool
mutateChild (Elm, Buff buff) override ///< bluff to care for children, while just reproducing ourselves
{
buff.create (BlackHoleMutation());
return true;
}
};
@ -91,7 +107,7 @@ namespace diff{
inline auto
Builder<PAR>::ignoreAllChanges()
{
return chainedBuilder<BlackHoleMutation<PAR>>();
return Builder<BlackHoleMutation> (BlackHoleMutation{});
}

25
wiki/thinkPad.ichthyo.mm
View file

@ -16549,8 +16549,8 @@
</node>
<node CREATED="1539270808827" ID="ID_1352270227" MODIFIED="1539270817730" TEXT="f&#xfc;r TimelineGui">
<linktarget COLOR="#a9b4c1" DESTINATION="ID_1352270227" ENDARROW="Default" ENDINCLINATION="117;0;" ID="Arrow_ID_1672775567" SOURCE="ID_1624846094" STARTARROW="None" STARTINCLINATION="117;0;"/>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1539294555064" HGAP="45" ID="ID_1365984217" MODIFIED="1539294575340" TEXT="Problem: diff ignorieren" VSHIFT="23">
<icon BUILTIN="flag-yellow"/>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1539294555064" HGAP="45" ID="ID_1365984217" MODIFIED="1539299038616" TEXT="Problem: diff ignorieren" VSHIFT="23">
<icon BUILTIN="messagebox_warning"/>
<node CREATED="1539294576338" ID="ID_485684974" MODIFIED="1539294587881" TEXT="kann das auftreten....?">
<icon BUILTIN="help"/>
<node CREATED="1539294589200" ID="ID_1206613848" MODIFIED="1539294592657" TEXT="ja">
@ -16579,10 +16579,10 @@
<node CREATED="1539294678444" ID="ID_934706379" MODIFIED="1539294693604" TEXT="TreeMutator scheitert per Default">
<icon BUILTIN="broken-line"/>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1539294698801" ID="ID_1533611583" MODIFIED="1539294720527" TEXT="also brauche ich einen /dev/null-Mutator">
<icon BUILTIN="flag-yellow"/>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1539294727470" ID="ID_1958316881" MODIFIED="1539294738485" TEXT="speziellen Binding-Layer fabrizieren">
<icon BUILTIN="flag-yellow"/>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1539294698801" ID="ID_1533611583" MODIFIED="1539299026168" TEXT="also brauche ich einen /dev/null-Mutator">
<icon BUILTIN="pencil"/>
<node COLOR="#338800" CREATED="1539294727470" ID="ID_1958316881" MODIFIED="1539299017213" TEXT="speziellen Binding-Layer fabrizieren">
<icon BUILTIN="button_ok"/>
<node CREATED="1539294807066" ID="ID_1137741867" MODIFIED="1539294809654" TEXT="wie?"/>
<node CREATED="1539294812306" ID="ID_1564927840" MODIFIED="1539294826763" TEXT="mu&#xdf; das Standard-Mapping anschauen"/>
<node CREATED="1539294846845" ID="ID_1839295475" MODIFIED="1539294935855" TEXT="TreeDiffMutatorBinding">
@ -16596,8 +16596,8 @@
<node CREATED="1539294909749" ID="ID_1965063755" MODIFIED="1539294918319" TEXT="Impl in tree-diff.cpp">
<icon BUILTIN="idea"/>
</node>
<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1539294950567" ID="ID_1321971857" MODIFIED="1539294956088" TEXT="alle F&#xe4;lle durchklappern">
<icon BUILTIN="flag-pink"/>
<node COLOR="#338800" CREATED="1539294950567" ID="ID_1321971857" MODIFIED="1539298935822" TEXT="alle F&#xe4;lle durchklappern">
<icon BUILTIN="button_ok"/>
</node>
</node>
</node>
@ -16606,6 +16606,15 @@
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1539294760464" ID="ID_1376112641" MODIFIED="1539294792408" TEXT="DiffIgnoreChanges_test">
<icon BUILTIN="flag-yellow"/>
<node COLOR="#338800" CREATED="1539298953819" ID="ID_1706428916" MODIFIED="1539298972769" TEXT="leerer TreeMutator produziert Fehler">
<icon BUILTIN="button_ok"/>
</node>
<node COLOR="#338800" CREATED="1539298974312" ID="ID_986781359" MODIFIED="1539298992271" TEXT="BlackHoleMutation fri&#xdf;t alles">
<icon BUILTIN="button_ok"/>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1539298993222" ID="ID_647799125" MODIFIED="1539299007509" TEXT="Kombinieren mit speziellem Overlay">
<icon BUILTIN="flag-yellow"/>
</node>
</node>
</node>
</node>