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60 changes: 30 additions & 30 deletions doc/features.mld
Original file line number Diff line number Diff line change
Expand Up @@ -2,13 +2,13 @@

[odoc] works by taking module interfaces, processing them to make them more
useful, and turning them into documentation. This processing is largely {{!hiding}hiding}, handling of {{!canonical}
canonical references}, {{!expansion}expansion} and {{!resolution}resolution}.
canonical references}, {{!expansion}expansion}, and {{!resolution}resolution}.
This document explains the features of these processes in detail.

{1:hiding Hiding}

Some items are not intended to be used directly but are present as
implementation detail, e.g., for testing, for implementing Dune's namespacing, or other reasons.
implementation detail, e.g., for testing, implementing Dune's namespacing, or other reasons.

There are two mechanisms for explicitly hiding elements from the final
output. The first is to use {{:https://ocaml.org/manual/ocamldoc.html#ss:ocamldoc-stop}documentation stop comments},
Expand All @@ -20,15 +20,15 @@ mechanism is only used for modules and is a naming convention. If any module has
Occasionally it’s useful to declare an item in one place and expose
it in the public interface in another. In order to prevent unwanted occurrences
of the actual definition site, [odoc] has a feature whereby the 'canonical'
location of a module, module type or type can be specified.
location of a module, module type, or type can be specified.

The biggest user of module aliases is Dune's {{:https://dune.readthedocs.io/en/stable/dune-files.html#library}wrapped libraries}.
The biggest user of module aliases is Dune's {{:https://dune.readthedocs.io/en/stable/reference/dune/library.html#library}wrapped libraries}.
This feature allows Dune to produce a library whose interface is exposed entirely
though a single top-level module. It does this by mangling the names of the
real implementation modules and generating the single top-level module that
real implementation modules. Then it generates the single top-level module that
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simply contains aliases to the these implementation modules. With [odoc]'s
canonical modules feature all references to the implementation modules are
rewritten to point at the aliases in the top-level module instead. Please
canonical modules feature, all references to the implementation modules are
rewritten to point at the top-level module aliases instead. Please
see the section on Dune's
{{!page-dune.library_wrapping}library wrapping} for more detail.

Expand Down Expand Up @@ -64,7 +64,7 @@ in which [odoc] has to treat specially.

{2:expansion_aliases Aliases}

In general [odoc] doesn’t expand module aliases unless they are an
In general, [odoc] doesn’t expand module aliases unless they are an
alias to a hidden module. If this is the case, the right-hand side of
the declaration is dropped and replaced with [sig ... end], and
the expansion is created.
Expand All @@ -82,7 +82,7 @@ module Alias = Hidden__module

]}

the [Hidden__module] module won’t be present in the output, and
The [Hidden__module] module won’t be present in the output, and
the [Alias] module will be rendered as if it were a simple
signature. This can be seen in the example rendering {{!Odoc_examples.Expansion.Aliases}here}.

Expand All @@ -106,13 +106,13 @@ end
module type B = A
]}

For these simple module type declarations, where the right-hand side is just a
For these simple module-type declarations, where the right-hand side is just a
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path, [odoc] treats them as module aliases and doesn’t produce an expansion.
This example is rendered {{!Odoc_examples.Expansion.ModuleTypeAliases}here}.

When strengthening, OCaml turns modules into aliases to the original
module, but nothing is done to module types. In contrast, [odoc] replaces
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module types with 'aliases' to the originals, too. These are not expanded, hence this is important for reducing the size of the output.
module types with 'aliases' to the originals, too. These are not expanded, hence this is important for reducing the size of the output.

The following examples use [module type of struct include ... end] to
obtain the strengthened signature of [A] (see the {{!module_type_of}[Module Type Of]}
Expand Down Expand Up @@ -176,7 +176,7 @@ The above functor can be seen rendered {{!Odoc_examples.Expansion.Functors.Funct
If part of your module signature comes from an include of another
module or module type, [odoc] keeps track of this and can render
the included items in a clearly delimited and collapsible way.
For example, given the following:
For example:
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{[
module type ToBeIncluded = sig
Expand Down Expand Up @@ -298,7 +298,7 @@ type foo
module M : MODTYPE with type X.t = foo
]}

the {{!Odoc_examples.Expansion.DeepEquality2.M}expansion of M} does not contain any [with type] equations.
The {{!Odoc_examples.Expansion.DeepEquality2.M}expansion of M} does not contain any [with type] equations.

{2 Substitution}

Expand All @@ -307,7 +307,7 @@ for types and modules to be {e destructively} substituted, so the
type or module is entirely removed from the resulting signature.

As with the addition of equations above, these substitutions may be on
deeply nested modules, and care needs to be taken to ensure that there are
deeply nested modules. Care must be taken to ensure that there are
no references to the removed module or type left. For example:

{[
Expand All @@ -329,8 +329,8 @@ module M: sig type t end with type t := int
type t = M.t
]}

From this expansion it is still clear how to resolve the right-hand side
of [type t = M.t], and the next phase of [odoc]'s transformation turns the
From this expansion, it is still clear how to resolve the right-hand side
of [type t = M.t]. The next phase of [odoc]'s transformation turns the
right-hand side of [M.t] into [int].

In the output documentation, the declaration of [module M] is rendered
Expand All @@ -340,8 +340,8 @@ simply as
module M : sig ... end
]}

with the type substitution dropped. This is because the type substitition on
the simple signature isn't useful for the reader; the link [t] would
with the type substitution dropped. This is because the simple signature's type substitition
isn't useful for the reader. The link [t] would
have no destination. This example is rendered {{!Odoc_examples.Expansion.TypeSubstitution}here}.


Expand All @@ -350,7 +350,7 @@ have no destination. This example is rendered {{!Odoc_examples.Expansion.TypeSub
The OCaml construct [module type of] allows the type of a module to be
recovered. As usual, when OCaml performs this operation, it only retains
the simplified signature, stripped of comments, includes, and more
complex module type expressions. As with the previous sections, [odoc]
complex module-type expressions. As with the previous sections, [odoc]
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tries a little harder to keep track of these things and also of the
fact that the signature came from a [module type of] expression.

Expand All @@ -367,7 +367,7 @@ end
module M : module type of A
]}

the [type t] in module [M] has the comment from the original module.
The [type t] in module [M] has the comment from the original module.
There is also logic in [odoc] to manage the similar construct
[module type of struct include ... end], which is used where the types
and modules are required to be strengthened. That is, the types in
Expand Down Expand Up @@ -411,7 +411,7 @@ module type S =
end
]}

whereas [odoc] preserves the fact that [Y] and [Z] are calculated from [X]. If the
Whereas [odoc] preserves the fact that [Y] and [Z] are calculated from [X]. If the
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module [X] is subsequently replaced using a destructive substitution on [S], the
results would be different. Given the following,

Expand All @@ -424,7 +424,7 @@ end
module type T = S with module X := X1
]}

then the signature of [T] as calculated by OCaml will be
then the signature of [T], as calculated by OCaml, will be

{[
sig
Expand All @@ -440,8 +440,8 @@ There is logic in [odoc] to handle this correctly, but since there is currently
syntax for representing transparent ascription, the consequence is that we lose
the fact that [Y] and [Z] originally came from [module type of] expressions.

This example is rendered {{!Odoc_examples.Expansion.ModuleTypeOfComplications}here},
and in the {{!Odoc_examples.Expansion.ModuleTypeOfComplications.T}expansion of T}, it
This example is rendered {{!Odoc_examples.Expansion.ModuleTypeOfComplications}here}.
In the {{!Odoc_examples.Expansion.ModuleTypeOfComplications.T}expansion of T}, it
can be seen that [Y] and [Z] are simple signatures only containing [type t].


Expand All @@ -462,7 +462,7 @@ to an element within a module type, and [module-M] and [module-M.module-X.type-t
identifiers; however, unlike paths, they are not checked by the compiler and are entirely
resolved by [odoc].

In most of the output formats, [odoc] supports paths; references and fragments will be
In most of the output formats, [odoc] supports paths. References and fragments will be
turned into links that take the reader to the referred identifier. These
links need to consider some of the expansions’ features,
as outlined above. In order to decide where the links should point to and how to
Expand Down Expand Up @@ -512,8 +512,8 @@ mechanism. This example is demonstrated {{!Odoc_examples.Resolution.HiddenAlias}
When encountering a module, module type, or a type that has been marked with a
[@canonical] tag, [odoc] first has to check that the specified canonical path
actually resolves. If this is the case, in a similar way to the alias above, the
target of the path will be rewritten to point to the canonical path.
However, in contrast to the alias behaviour, the {e text} of the path will
path's target will be rewritten to point to the canonical path.
However, in contrast to the alias behaviour, the path's {e text} will
also be rewritten, so it will be as if the canonical path had been written instead
of whatever path was actually there.

Expand Down Expand Up @@ -544,7 +544,7 @@ written by the author, they’re assumed to point to the correct destination.

{2 Fragment Resolution}

Fragments are relative paths that appear in module type expressions when
Fragments are relative paths that appear in module-type expressions when
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adding equations or substituting types or modules. For example:

{[
Expand Down Expand Up @@ -588,12 +588,12 @@ type w = U of u
]}

[type v] will have a right-hand side of [T of int], as the hidden [type t] is
equal to [int]; whereas, there is no non-hidden type equivalent to [u], so the
equal to [int]. Conversely, there is no non-hidden type equivalent to [u], so the
right-hand side of [type w] is omitted from the output.

{2:reference_resolution Reference Resolution}

References are hand-written in comments and not evaluated in any way by the
References are handwritten in comments and not evaluated in any way by the
compiler.

{[
Expand Down
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