[nit.git] / src / doc / doc_base.nit

# This file is part of NIT ( http://www.nitlanguage.org ).
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Base entities shared by all the nitdoc code.
module doc_base

import toolcontext
import model_ext
import model::model_views

# The model of a Nitdoc documentation.
#
# `DocModel` contains the list of the `DocPage` to be generated.
#
# The model is populated through `DocPhase` to be constructed.
# It is a placeholder to share data between each phase.
class DocModel
        super ModelView

        # `DocPage` composing the documentation associated to their ids.
        #
        # This is where `DocPhase` store and access pages to produce documentation.
        #
        # See `add_page`.
        var pages: Map[String, DocPage] = new HashMap[String, DocPage]

        # Add a `page` to this documentation.
        fun add_page(page: DocPage) do
                if pages.has_key(page.id) then
                        print "Warning: multiple page with the same id `{page.id}`"
                end
                pages[page.id] = page
        end
end

# A documentation page abstraction.
#
# The page contains a link to the `root` of the `DocComposite` that compose the
# the page.
class DocPage

        # Page uniq id.
        #
        # The `id` is used as name for the generated file corresponding to the page
        # (if any).
        # Because multiple pages can be generated in the same directory it should be
        # uniq.
        #
        # The `id` can also be used to establish links between pages (HTML links,
        # HTML anchors, vim links, etc.).
        var id: String is writable

        # Title of this page.
        var title: String is writable

        # Root element of the page.
        #
        # `DocPhase` access the structure of the page from the `DocRoot`.
        var root = new DocRoot

        redef fun to_s do return title

        # Pretty prints the content of this page.
        fun pretty_print: Writable do
                var res = new Template
                res.addn "{class_name} {title}"
                for child in root.children do
                        child.pretty_print_in(res)
                end
                return res
        end
end

# `DocPage` elements that can be nested in another.
#
# `DocComposite` is an abstraction for everything that go in a `DocPage` like
# sections, articles, images, lists, graphs...
#
# It provides base services for nesting mechanisms following the
# *Composite pattern*.
# The composed structure is a tree from a `DocRoot` that can be manipulated
# recursively.
abstract class DocComposite

        # Parent element.
        var parent: nullable DocComposite = null is writable

        # Element uniq id.
        #
        # The `id` is used as name for the generated element (if any).
        # Because multiple elements can be generated in the same container
        # it should be uniq.
        #
        # The `id` can also be used to establish links between elements
        # (HTML links, HTML anchors, vim links, etc.).
        var id: String is writable

        # Item title if any.
        var title: nullable String is writable

        # Does `self` have a `parent`?
        fun is_root: Bool do return parent == null

        # Children elements contained in `self`.
        #
        # Children are ordered, this order can be changed by the `DocPhase`.
        var children = new Array[DocComposite]

        # Is `self` not displayed in the page.
        #
        # By default, empty elements are hidden.
        fun is_hidden: Bool do return children.is_empty

        # Title used in table of content if any.
        var toc_title: nullable String is writable, lazy do return title

        # Is `self` hidden in the table of content?
        var is_toc_hidden: Bool is writable, lazy do
                return toc_title == null or is_hidden
        end

        # Add a `child` to `self`.
        #
        # Shortcut for `children.add`.
        fun add_child(child: DocComposite) do
                child.parent = self
                children.add child
        end

        # Depth of `self` in the composite tree.
        fun depth: Int do
                var parent = self.parent
                if parent == null then return 0
                return parent.depth + 1
        end

        # Pretty prints this composite recursively.
        fun pretty_print: Writable do
                var res = new Template
                pretty_print_in(res)
                return res
        end

        # Appends the Pretty print of this composite in `res`.
        private fun pretty_print_in(res: Template) do
                res.add "\t" * depth
                res.add "#" * depth
                res.addn " {id}"
                for child in children do child.pretty_print_in(res)
        end
end

# The `DocComposite` element that contains all the other.
#
# The root uses a specific subclass to provide different a different behavior
# than other `DocComposite` elements.
class DocRoot
        noautoinit
        super DocComposite

        redef var id = "<root>"
        redef var title = "<root>"

        # No op for `RootSection`.
        redef fun parent=(p) do end
end

# Base page elements.

# `DocSection` are used to break the documentation page into meaningfull parts.
#
# The content of the documentation summary is based on the section structure
# contained in the DocComposite tree.
class DocSection
        super DocComposite
end

# `DocArticle` are pieces of documentation.
#
# They maintains the content (text, list, image...) of a documentation page.
class DocArticle
        super DocComposite
end

# A DocPhase is a step in the production of a Nitdoc documentation.
#
# Phases work from a `DocModel`.
# Specific phases are used to populate, organize, enhance and render the content
# of the documentation pages.
#
# See `doc_phases` for available DocPhase.
class DocPhase

        # Link to the ToolContext to access Nitdoc tool options.
        var ctx: ToolContext

        # `DocModel` used by this phase to work.
        var doc: DocModel

        # Starting point of a `DocPhase`.
        #
        # This is where the behavior of the phase is implemented.
        # Phases can populate, edit or render the `doc` from here.
        fun apply is abstract
end

redef class ToolContext

        # Directory where the Nitdoc is rendered.
        var opt_dir = new OptionString("Output directory", "-d", "--dir")

        # Shortcut for `opt_dir.value` with default "doc".
        var output_dir: String is lazy do return opt_dir.value or else "doc"

        redef init do
                super
                option_context.add_option(opt_dir)
        end
end

# Catalog properties by kind.
class PropertiesByKind
        # The virtual types.
        var virtual_types = new PropertyGroup[MVirtualTypeProp]("Virtual types")

        # The constructors.
        var constructors = new PropertyGroup[MMethod]("Contructors")

        # The attributes.
        var attributes = new PropertyGroup[MAttribute]("Attributes")

        # The methods.
        var methods = new PropertyGroup[MMethod]("Methods")

        # The inner classes.
        var inner_classes = new PropertyGroup[MInnerClass]("Inner classes")

        # All the groups.
        #
        # Sorted in the order they are displayed to the user.
        var groups: SequenceRead[PropertyGroup[MProperty]] = [
                        virtual_types,
                        constructors,
                        attributes,
                        methods,
                        inner_classes: PropertyGroup[MProperty]]

        # Add each the specified property to the appropriate list.
        init with_elements(properties: Collection[MProperty]) do add_all(properties)

        # Add the specified property to the appropriate list.
        fun add(property: MProperty) do
                if property isa MMethod then
                        if property.is_init then
                                constructors.add property
                        else
                                methods.add property
                        end
                else if property isa MVirtualTypeProp then
                        virtual_types.add property
                else if property isa MAttribute then
                        attributes.add property
                else if property isa MInnerClass then
                        inner_classes.add property
                else
                        abort
                end
        end

        # Add each the specified property to the appropriate list.
        fun add_all(properties: Collection[MProperty]) do
                for p in properties do add(p)
        end

        # Sort each group with the specified comparator.
        fun sort_groups(comparator: Comparator) do
                for g in groups do comparator.sort(g)
        end
end

# An ordered list of properties of the same kind.
class PropertyGroup[E: MProperty]
        super Array[E]

        # The title of the group, as displayed to the user.
        var title: String
end

redef class MEntity
        # ID used as a unique ID and in file names.
        #
        # **Must** match the following (POSIX ERE) regular expression:
        #
        # ~~~POSIX ERE
        # ^[A-Za-z_][A-Za-z0-9._-]*$
        # ~~~
        #
        # That way, the ID is always a valid URI component and a valid XML name.
        fun nitdoc_id: String do return full_name.to_cmangle

        # Name displayed in console for debug and tests.
        fun nitdoc_name: String do return name.html_escape
end

redef class MModule

        # Avoid id conflict with group
        redef fun nitdoc_id do
                var mgroup = self.mgroup
                if mgroup == null then return super
                return "{mgroup.full_name}::{full_name}".to_cmangle
        end
end

redef class MClassDef
        redef fun nitdoc_name do return mclass.nitdoc_name
end

redef class MPropDef
        redef fun nitdoc_name do return mproperty.nitdoc_name
end