Some Atom handling refactoring
Signed-off-by: Christopher Arndt <chris@chrisarndt.de>
This commit is contained in:
parent
d39cea5a98
commit
11c9fc653d
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@ -29,7 +29,7 @@ proc instantiate(descriptor: ptr Lv2Descriptor; sampleRate: cdouble;
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if amp.map == nil:
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return nil
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amp.midi_urid = amp.map[].map(amp.map[].handle, lv2MidiMidiEvent)
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amp.midi_urid = amp.map.map(amp.map.handle, lv2MidiMidiEvent)
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return cast[Lv2Handle](amp)
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@ -56,17 +56,17 @@ proc run(instance: Lv2Handle; nSamples: cuint) {.cdecl.} =
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atomSequenceClear(amp.output)
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amp.output.atom.type = amp.input.atom.type
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if amp.input.atom.size > 8:
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if not atomSequenceIsEmpty(amp.input):
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#echo &"Event sequence size: {amp.input.atom.size}"
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let noteOffset = clamp(floor(amp.transposition[] + 0.5), -12, 12).uint8
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for ev in items(amp.input):
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if Urid(ev.body.`type`) == amp.midi_urid:
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for ev in amp.input:
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if ev.body.`type` == amp.midi_urid:
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var msg = cast[ptr UncheckedArray[uint8]](atomContents(AtomEvent, ev))
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#echo &"0x{toHex(msg[0], 2)} 0x{toHex(msg[1], 2)} 0x{toHex(msg[2], 2)}"
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case midiGetMessageType(msg[]):
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of midiMsgNoteOff, midiMsgNoteOn, midiMsgNotePressure:
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let noteOffset = clamp(floor(amp.transposition[] + 0.5), -12, 12).uint8
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msg[1] = clamp(msg[1] + noteOffset, 0, 127).uint8
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else:
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discard
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@ -7,6 +7,7 @@
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##
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import ptrmath
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import urid
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const
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lv2AtomBaseUri ="http://lv2plug.in/ns/ext/atom"
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@ -64,7 +65,7 @@ type
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## The header of an atom:Atom.
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Atom* {.bycopy.} = object
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size*: uint32 ## Size in bytes, not including type and size.
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`type`*: uint32 ## of this atom (mapped URI).
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`type`*: Urid ## Type of this atom (mapped URI).
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## An atom:Int or atom:Bool. May be cast to Atom.
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AtomInt* {.bycopy.} = object
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@ -92,7 +93,7 @@ type
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## An atom:URID. May be cast to Atom.
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AtomUrid* {.bycopy.} = object
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atom*: Atom ## Atom header.
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body*: uint32 ## URID.
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body*: Urid ## Urid.
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## An atom:String. May be cast to Atom.
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AtomString* {.bycopy.} = object
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@ -101,8 +102,8 @@ type
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## The body of an atom:Literal.
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AtomLiteralBody* {.bycopy.} = object
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datatype*: uint32 ## DataURID.
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lang*: uint32 ## Language URID.
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datatype*: Urid ## Datatype Urid.
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lang*: Urid ## Language Urid.
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## Contents (a null-terminated UTF-8 string) follow here.
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## An atom:Literal. May be cast to Atom.
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@ -128,8 +129,8 @@ type
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## The body of an atom:Property (typically in an atom:Object).
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AtomPropertyBody* {.bycopy.} = object
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key*: uint32 ## Key (predicate) (mapped URI).
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context*: uint32 ## Context URID (may be, and generally is, 0).
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key*: Urid ## Key (predicate) (mapped URI).
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context*: Urid ## Context URID (may be, and generally is, 0).
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value*: Atom ## Value atom header.
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## Value atom body follows here.
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@ -140,8 +141,8 @@ type
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## The body of an atom:Object. May be cast to Atom.
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AtomObjectBody* {.bycopy.} = object
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id*: uint32 ## URID, or 0 for blank.
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otype*: uint32 ## URID (same as rdf:type, for fast dispatch).
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id*: Urid ## Urid, or 0 for blank.
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otype*: Urid ## Urid (same as rdf:type, for fast dispatch).
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## Contents (a series of property bodies) follow here.
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## An atom:Object. May be cast to Atom.
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@ -176,7 +177,7 @@ type
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## </pre>
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##
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AtomSequenceBody* {.bycopy.} = object
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unit*: uint32 ## URID of unit of event time stamps.
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unit*: Urid ## Urid of unit of event time stamps.
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pad*: uint32 ## Currently unused.
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## Contents (a series of events) follow here.
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@ -13,6 +13,7 @@
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from system/ansi_c import c_memcmp, c_memcpy
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import ../atom
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import ../ptrmath
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import ../urid
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##
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## Pad a size to 64 bits.
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@ -31,7 +32,7 @@ proc atomTotalSize*(atom: ptr Atom): uint32 {.inline.} =
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## Return true iff `atom` is null.
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##
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proc atomIsNull*(atom: ptr Atom): bool {.inline.} =
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return atom == nil or (atom.`type` == 0 and atom.size == 0)
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return atom == nil or (atom.`type` == Urid(0) and atom.size == 0)
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##
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## Return true iff `a` is equal to `b`.
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@ -46,31 +47,30 @@ proc atomEquals*(a: ptr Atom; b: ptr Atom): bool {.inline.} =
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##
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## Get an iterator pointing to the first event in a Sequence body.
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##
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proc atomSequenceBegin*(body: ptr AtomSequenceBody): ptr AtomEvent {.inline.} =
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return cast[ptr AtomEvent](body + 1)
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template atomSequenceBegin*(body: ptr AtomSequenceBody): ptr AtomEvent =
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cast[ptr AtomEvent](body + 1)
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##
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## Get an iterator pointing to the end of a Sequence body.
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##
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proc atomSequenceEnd*(body: ptr AtomSequenceBody; size: uint32): ptr AtomEvent {.inline.} =
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return cast[ptr AtomEvent](cast[ptr uint8](body) + atomPadSize(size))
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template atomSequenceEnd*(body: ptr AtomSequenceBody; size: Natural): ptr AtomEvent =
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cast[ptr AtomEvent](cast[ptr uint8](body) + atomPadSize(size.uint32))
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##
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## Return true iff `i` has reached the end of `body`.
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##
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proc atomSequenceIsEnd*(body: ptr AtomSequenceBody; size: Natural; i: ptr AtomEvent): bool {.inline.} =
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return cast[ptr uint8](i) >= (cast[ptr uint8](body) + size.uint)
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template atomSequenceIsEnd*(body: ptr AtomSequenceBody; size: Natural; i: ptr AtomEvent): bool =
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cast[ptr uint8](i) >= (cast[ptr uint8](body) + size.uint)
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##
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## Return an iterator to the element following `i`.
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##
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proc atomSequenceNext*(i: ptr AtomEvent): ptr AtomEvent {.inline.} =
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return cast[ptr AtomEvent](cast[ptr uint8](i) + sizeof(AtomEvent) + atomPadSize(i.body.size))
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template atomSequenceNext*(i: ptr AtomEvent): ptr AtomEvent =
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cast[ptr AtomEvent](cast[ptr uint8](i) + sizeof(AtomEvent) + atomPadSize(i.body.size))
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##
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## An iterator for looping over all events in a Sequence.
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## @param seq The sequence to iterate over
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## An iterator for looping over all events in an AtomSequence.
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## @param seq Pointer to the sequence to iterate over
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##
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iterator items*(seq: ptr AtomSequence): ptr AtomEvent {.inline.} =
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var event = atomSequenceBegin(seq.body.addr)
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@ -78,11 +78,28 @@ iterator items*(seq: ptr AtomSequence): ptr AtomEvent {.inline.} =
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yield event
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event = atomSequenceNext(event)
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## TODO: Like LV2_ATOM_SEQUENCE_FOREACH but for a headerless sequence body.
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##
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## An iterator for looping over all events in an AtomSequenceBody.
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## @param body Pointer to the sequence body to iterate over
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## @param size Size in bytes of the sequence body (including the 8 bytes of AtomSequenceBody)
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##
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iterator items*(body: ptr AtomSequenceBody, size: Natural): ptr AtomEvent {.inline.} =
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var event = atomSequenceBegin(body)
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while not atomSequenceIsEnd(body, size, event):
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yield event
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event = atomSequenceNext(event)
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##
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## Sequence Utilities
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##
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##
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## Test if AtomSequence is empty, i.e the body has no events
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##
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template atomSequenceIsEmpty*(seq: ptr AtomSequence): bool =
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seq.atom.size == sizeof(AtomSequenceBody).uint32
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##
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## Clear all events from `sequence`.
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##
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## This simply resets the size field, the other fields are left untouched.
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@ -118,48 +135,60 @@ proc atomSequenceAppendEvent*(seq: ptr AtomSequence; capacity: uint32;
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##
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## Get an iterator pointing to the first element in `tup`.
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##
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proc atomTupleBegin*(tup: ptr AtomTuple): ptr Atom {.inline.} =
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return cast[ptr Atom](atomContents(Atom, tup))
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template atomTupleBegin*(tup: ptr AtomTuple): ptr Atom =
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cast[ptr Atom](atomContents(Atom, tup))
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##
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## Return true iff `i` has reached the end of `body`.
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##
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proc atomTupleIsEnd*(body: pointer; size: Natural; i: ptr Atom): bool {.inline.} =
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return cast[ptr uint8](i) >= (cast[ptr uint8](body) + size.int)
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template atomTupleIsEnd*(body: pointer; size: Natural; i: ptr Atom): bool =
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cast[ptr uint8](i) >= (cast[ptr uint8](body) + size.uint)
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##
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## Return an iterator to the element following `i`.
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##
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proc atomTupleNext*(i: ptr Atom): ptr Atom {.inline.} =
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return cast[ptr Atom](cast[ptr uint8](i) + sizeof(Atom) + atomPadSize(i.size))
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template atomTupleNext*(i: ptr Atom): ptr Atom =
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cast[ptr Atom](cast[ptr uint8](i) + sizeof(Atom) + atomPadSize(i.size))
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## TODO:
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##
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## A iterator for looping over all properties of a Tuple.
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## @param tuple The tuple to iterate over
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## An iterator for looping over all elements of an AtomTuple.
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## @param tuple Pointer to the tuple to iterate over
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##
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iterator items*(tup: ptr AtomTuple): ptr Atom {.inline.} =
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var atom = atomTupleBegin(tup)
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while not atomTupleIsEnd(atomBody(tup), tup.atom.size, atom):
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yield atom
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atom = atomTupleNext(atom)
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## TODO:
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## Like LV2_ATOM_TUPLE_FOREACH but for a headerless tuple body.
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##
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## An iterator for looping over all elements of a headerless tuple.
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## @param tuple Pointer to the first Atom of the tuple to iterate over
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## @param size Size in bytes of the tuple body
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##
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iterator items*(tup: ptr Atom, size: Natural): ptr Atom {.inline.} =
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var atom = tup
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while not atomTupleIsEnd(tup, size, atom):
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yield atom
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atom = atomTupleNext(atom)
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##
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## Object Iterator
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##
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## Return a pointer to the first property in `body`.
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##
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proc atomObjectBegin*(body: ptr AtomObjectBody): ptr AtomPropertyBody {.inline.} =
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return cast[ptr AtomPropertyBody](body + 1)
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template atomObjectBegin*(body: ptr AtomObjectBody): ptr AtomPropertyBody =
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cast[ptr AtomPropertyBody](body + 1)
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##
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## Return true iff `i` has reached the end of `obj`.
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##
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proc atomObjectIsEnd*(body: ptr AtomObjectBody; size: Natural; i: ptr AtomPropertyBody): bool {.inline.} =
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return cast[ptr uint8](i) >= (cast[ptr uint8](body) + size.int)
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template atomObjectIsEnd*(body: ptr AtomObjectBody; size: Natural; i: ptr AtomPropertyBody): bool =
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cast[ptr uint8](i) >= (cast[ptr uint8](body) + size.uint)
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##
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## Return an iterator to the property following `i`.
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##
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proc atomObjectNext*(i: ptr AtomPropertyBody): ptr AtomPropertyBody {.inline.} =
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template atomObjectNext*(i: ptr AtomPropertyBody): ptr AtomPropertyBody =
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let value = cast[ptr Atom](cast[ptr uint8](i) + 2 * sizeof(uint32))
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return cast[ptr AtomPropertyBody](cast[ptr uint8](i) + atomPadSize(sizeof(AtomPropertyBody).uint32 + value.size))
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@ -14,81 +14,82 @@ const
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lv2UridMap* = lv2UridPrefix & "map"
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lv2UridUnmap* = lv2UridPrefix & "unmap"
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##
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## Opaque pointer to host data for UridMap.
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##
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type UridMapHandle* = pointer
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type
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##
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## URI mapped to an integer.
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##
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Urid* = distinct uint32
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##
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## Opaque pointer to host data for uridUnmap.
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##
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type UridUnmapHandle* = pointer
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##
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## Opaque pointer to host data for UridMap.
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##
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UridMapHandle* = pointer
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##
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## URI mapped to an integer.
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##
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type Urid* = distinct uint32
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##
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## Opaque pointer to host data for uridUnmap.
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##
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UridUnmapHandle* = pointer
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##
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## URID Map Feature (lv2UridMap)
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##
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type UridMap* {.bycopy.} = object
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##
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## Opaque pointer to host data.
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## URID Map Feature (lv2UridMap)
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##
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## This MUST be passed to map_uri() whenever it is called.
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## Otherwise, it must not be interpreted in any way.
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##
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handle*: UridMapHandle
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##
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## Get the numeric ID of a URI.
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##
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## If the ID does not already exist, it will be created.
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##
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## This function is referentially transparent; any number of calls with the
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## same arguments is guaranteed to return the same value over the life of a
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## plugin instance. Note, however, that several URIs MAY resolve to the
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## same ID if the host considers those URIs equivalent.
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##
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## This function is not necessarily very fast or RT-safe: plugins SHOULD
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## cache any IDs they might need in performance critical situations.
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##
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## The return value 0 is reserved and indicates that an ID for that URI
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## could not be created for whatever reason. However, hosts SHOULD NOT
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## return 0 from this function in non-exceptional circumstances (i.e. the
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## URI map SHOULD be dynamic).
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##
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## @param handle Must be the callback_data member of this struct.
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## @param uri The URI to be mapped to an integer ID.
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##
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map*: proc (handle: UridMapHandle; uri: cstring): Urid
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UridMap* {.bycopy.} = object
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##
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## Opaque pointer to host data.
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##
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## This MUST be passed to map_uri() whenever it is called.
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## Otherwise, it must not be interpreted in any way.
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##
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handle*: UridMapHandle
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##
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## Get the numeric ID of a URI.
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##
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## If the ID does not already exist, it will be created.
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##
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## This function is referentially transparent; any number of calls with the
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## same arguments is guaranteed to return the same value over the life of a
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## plugin instance. Note, however, that several URIs MAY resolve to the
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## same ID if the host considers those URIs equivalent.
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##
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## This function is not necessarily very fast or RT-safe: plugins SHOULD
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## cache any IDs they might need in performance critical situations.
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##
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## The return value 0 is reserved and indicates that an ID for that URI
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## could not be created for whatever reason. However, hosts SHOULD NOT
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## return 0 from this function in non-exceptional circumstances (i.e. the
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## URI map SHOULD be dynamic).
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##
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## @param handle Must be the callback_data member of this struct.
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## @param uri The URI to be mapped to an integer ID.
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##
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map*: proc (handle: UridMapHandle; uri: cstring): Urid
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##
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## URI Unmap Feature (lv2UridUnmap)
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##
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type UridUnmap* {.bycopy.} = object
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##
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## Opaque pointer to host data.
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## URI Unmap Feature (lv2UridUnmap)
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##
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## This MUST be passed to unmap() whenever it is called.
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## Otherwise, it must not be interpreted in any way.
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##
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handle*: UridUnmapHandle
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##
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## Get the URI for a previously mapped numeric ID.
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##
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## Returns NULL if `urid` is not yet mapped. Otherwise, the corresponding
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## URI is returned in a canonical form. This MAY not be the exact same
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## string that was originally passed to LV2_URID_Map::map(), but it MUST be
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## an identical URI according to the URI syntax specification (RFC3986). A
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## non-NULL return for a given `urid` will always be the same for the life
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## of the plugin. Plugins that intend to perform string comparison on
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## unmapped URIs SHOULD first canonicalise URI strings with a call to
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## map_uri() followed by a call to unmap_uri().
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##
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## @param handle Must be the callback_data member of this struct.
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## @param urid The ID to be mapped back to the URI string.
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##
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unmap*: proc (handle: UridUnmapHandle; urid: Urid): cstring
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UridUnmap* {.bycopy.} = object
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##
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## Opaque pointer to host data.
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##
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## This MUST be passed to unmap() whenever it is called.
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## Otherwise, it must not be interpreted in any way.
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##
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handle*: UridUnmapHandle
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##
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## Get the URI for a previously mapped numeric ID.
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##
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## Returns NULL if `urid` is not yet mapped. Otherwise, the corresponding
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## URI is returned in a canonical form. This MAY not be the exact same
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## string that was originally passed to LV2_URID_Map::map(), but it MUST be
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## an identical URI according to the URI syntax specification (RFC3986). A
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## non-NULL return for a given `urid` will always be the same for the life
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## of the plugin. Plugins that intend to perform string comparison on
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## unmapped URIs SHOULD first canonicalise URI strings with a call to
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## map_uri() followed by a call to unmap_uri().
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##
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## @param handle Must be the callback_data member of this struct.
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## @param urid The ID to be mapped back to the URI string.
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##
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unmap*: proc (handle: UridUnmapHandle; urid: Urid): cstring
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proc `==`* (x: Urid, y: Urid): bool {.borrow.}
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