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177 lines
6.3 KiB
Plaintext
177 lines
6.3 KiB
Plaintext
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::
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:: These are the public types for the `xray` library. Analysing a type
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:: yields an `ximage`, and everything else here is just some structure
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:: within that.
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::
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:: `ximage`s can be printed as specs (hoon syntax for types), and can
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:: be used to pretty-print typed data.
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::
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^? |%
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::
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:: An `xtable` is a graph of types referenced by the top-level type,
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:: and the `root` `key` points to the node which corresponds to the
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:: type under analysis.
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::
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+$ ximage [root=xkey =xtable]
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::
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:: A `xkey` is just an identifier for a node in the xray graph.
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::
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+$ xkey @
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::
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:: An `xtable` is the xray graph itself. It contains one node for for
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:: the type that was analyzed and one node for every type referenced
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:: within that type.
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::
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:: The `next` field is the the next available xkey (used when inserting
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:: new xrays), `xrays` maps keys to graph nodes and `type-map` gives
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:: the xkey corresponding to a type.
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::
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:: The `type-map` is basically just the reverse of the `xrays` map. It
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:: doesn't contain any new information, but is needed for performance
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:: reasons.
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::
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+$ xtable [next=xkey xrays=(map xkey xray) =type=(map type xkey)]
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::
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:: An `xray` is a node in the `ximage` graph. It contains everything
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:: we know about a certain `type`. `key` is its identifier in the graph,
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:: `type` is the type that it's an xray of, and `xdat` is the basic
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:: information we derived about the type. The basic references to other
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:: nodes are inside the `xdat` structure, though some of the other
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:: fields may contain references as well.
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::
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:: - `xshape` is some more information about the xshape of data within
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:: a cell.
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:: - `xrole` expands on `xshape`, adding further information about the
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:: xrole that a node has within a fork.
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:: - `pats` is used for printing data: we want to know if this type
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:: can be printed as a list, as json, as a tape literal, etc.
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:: - `recipes` contains information about how a type was
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:: constructed. It's used to get much nicer output when printing types.
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:: - `studs` contains "standards names". I actually don't know what this is.
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:: - `helps` contains all the documentation about a type.
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:: - `loop` indicates whether or not a node references itself. The list
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:: type is cyclical, for example. This is used when printing an
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:: `ximage`.
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::
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+$ xray
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$: =xkey
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=type
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xdat=(unit xdat)
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xrole=(unit xrole)
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pats=(unit xpat)
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studs=(set stud)
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recipes=(set recipe)
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helps=(set help)
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xshape=(unit xshape)
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loop=(unit ?)
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==
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::
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:: - `%void` -- impossible to create.
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:: - `%noun` -- could be any noun.
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:: - `%atom` -- An atom of some aura, possibly constant
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:: - `%cell` -- A cell with a head and a tail.
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:: - `%core` -- A core, its garb, its context type, and the types of
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:: each of its arms.
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:: - `%face` -- A face on another type.
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:: - `%fork` -- Could be one or more other types.
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:: - `%pntr` -- This is an internal hack, it should never survive
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:: analysis; ignore.
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::
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+$ xdat
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$@ ?(%noun %void)
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$% [%atom =aura constant=(unit @)]
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[%cell head=xkey tail=xkey]
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[%core =garb xray=xkey batt=xbat]
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[%face face=$@(term tune) xray=xkey]
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[%fork =(set xkey)]
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[%pntr xray=xkey]
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==
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::
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:: The basic xshape of a type:
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::
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:: - `%void` -- impossible to create.
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:: - `%noun` -- could be any noun.
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:: - `%atom` -- always some type of atom; never a cell
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:: - `%cell` -- always some type of cell; never an atom.
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:: - `%junc` -- is a fork of a cell type and an atom type.
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::
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+$ xshape ?(%void %noun %atom %cell %junc)
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::
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:: A `xrole` is the of a type, including a more refined understanding
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:: of what xrole it plays within a fork.
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::
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:: Nodes referenced within a `xrole` often do not actually exist in the
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:: original type, since we need to reorganize forks in order to make
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:: them more coherent.
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::
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:: - `%void` -- impossible to create.
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:: - `%noun` -- could be any noun.
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:: - `%atom` -- always some type of atom; never a cell
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:: - `%constant` -- a cell type whose head is a constant atom.
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:: - `%tall` -- a cell type whose head is an atom.
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:: - `%wide` -- a cell type whose head is also a cell
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:: - `%instance` -- a cell type whose head is a constant atom.
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:: - `%option` -- a union of types which are all constant atoms.
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:: - `%union` -- a union of types which are all instances (cells whose
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:: head is a constant atom).
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:: - `%junction` -- a union of an atom type and a cell type.
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:: - `%conjunction` -- a union of two cell types, one of them %wide
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:: and the other %tall.
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:: - `%misjunction` -- any other union type. There's no efficient way
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:: to tell which branch to take when analyzing a fork which is a
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:: %misjunction, and the type is probably improperly constructed.
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::
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+$ xrole
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$@ $? %void %noun %atom %tall %wide ==
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$% [%constant =atom]
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[%instance =atom]
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[%option =(map atom xkey)]
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[%union =(map atom xkey)]
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[%junction flat=xkey deep=xkey]
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[%conjunction wide=xkey tall=xkey]
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[%misjunction one=xkey two=xkey]
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==
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::
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:: This is just a utility type, it encodes the "battery" structure
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:: within a core.
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::
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:: It's a map from chapter names to the documentation and arms within
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:: that chapter.
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::
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+$ xbat (map term (pair what (map term xkey)))
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::
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:: A recipe tells us how a type was constructed.
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::
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:: - `%direct` is a simple type like `term`, or `xray`.
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:: - `%synthetic` is a constructed type, like `(list @)`.
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::
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+$ recipe
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$% [%direct =term]
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[%synthetic =term =(list xkey)]
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==
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::
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:: A `xpat` is high-level information about the shape of a type. This
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:: is used for printing data.
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::
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:: This is fairly heuristic. [%a %b %c ~] is recognized as a `path`,
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:: `[3 ~[4 5 6]]` is recognized as a list, etc.
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::
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:: Most of the xpats have names that make their purpose obvious:
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:: for example, the %tape xpat means that data of type type can be
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:: printed as if it had the `tape` type. However, `%gear` and `%gate`
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:: might not be entirely obvious.
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::
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:: - The %gear xpat is any core with a cell subject.
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:: - The %gate xpat is a core that looks like a gate.
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::
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+$ xpat
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$@ ?(%hoon %manx %json %nock %path %plum %skin %spec %tape %tour %type %vase)
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$% [%gate sample=xkey product=xkey]
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[%gear sample=xkey context=xkey batt=xbat]
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[%list item=xkey]
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[%tree item=xkey]
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[%unit item=xkey]
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==
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--
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