7.3 Structures And Processing

► |  | Scribble: Racket Documentation Tool

1 | Getting Started
2 | @ Syntax
3 | High-Level Scribble API
4 | Scribbling Documentation
5 | Literate Programming
6 | Text Preprocessing
7 | Low-Level Scribble API
| Index

▼ | 7 | Low-Level Scribble API

7.1 | Scribble Layers
7.2 | @ Reader Internals
7.3 | Structures And Processing
7.4 | Renderer
7.5 | Decoding Text
7.6 | Document Language
7.7 | Document Reader
7.8 | Cross-Reference Utilities
7.9 | Extending and Configuring Scribble Output

► | 7.3 | Structures And Processing

7.3.1 | Parts
7.3.2 | Tags
7.3.3 | Styles
7.3.4 | Collected and Resolved Information
7.3.5 | Structure Reference
7.3.6 | HTML Style Properties
7.3.7 | Latex Style Properties

On this page:

7.3.1`` Parts
7.3.2`` Tags
7.3.3`` Styles
7.3.4`` Collected and Resolved Information
7.3.5`` Structure Reference
part
paragraph
table
itemization
nested-flow
compound-paragraph
traverse-block
delayed-block
element
image-element
target-element
toc-target-element
page-target-element
redirect-target-element
toc-element
link-element
index-element
multiarg-element
traverse-element
delayed-element
part-relative-element
collect-element
render-element
collected-info
target-url
document-version
color-property
background-color-property
table-cells
table-columns
block?
content?
style
plain
element-style?
tag?
generated-tag
content->string
content-width
block-width
collect-info
resolve-info
info-key?
collect-put!
resolve-get
resolve-get/ ext?
resolve-search
resolve-get/ tentative
resolve-get-keys
part-collected-info
tag-key
traverse-block-block
traverse-element-content
block-traverse-procedure/ c
element-traverse-procedure/ c
7.3.6`` HTML Style Properties
attributes
url-anchor
hover-property
script-property
css-addition
body-id
html-defaults
7.3.7`` Latex Style Properties
tex-addition
latex-defaults
latex-auto-extra-files

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#### 7.3`` Structures And Processing

( require scribble/core)

A document is represented as a part, as described in Parts. This representation is intended to be independent of its eventual rendering, and it is intended to be immutable; rendering extensions and specific data in a document can collude arbitrarily, however.

A document is processed in four passes:

- The traverse pass traverses the document content in document order so that information from one part of a document can be communicated to other parts of the same document. The information is transmitted through a symbol-keyed mapping that can be inspected and extended by traverse-elements and traverse-blocks in the document. The traverse pass iterates the traversal until it obtains a fixed point (i.e., the mapping from one iteration is unchanged from the previous iteration).

- The collect pass globally collects information in the document that can span documents that are built at separate times, such as targets for hyperlinking.

- The resolve pass matches hyperlink references with targets and expands delayed elements (where the expansion should not contribute new hyperlink targets).

- The render pass generates the result document.

None of the passes mutate the document representation. Instead, the traverse pass, collect pass, and resolve pass accumulate information in a side hash table, collect-info table, and resolve-info table. The collect pass and resolve pass are effectively specialized version of traverse pass that work across separately built documents.

##### 7.3.1`` Parts

A part is an instance of part; among other things, it has a title content, an initial flow, and a list of subsection parts. There is no difference between a part and a full document; a particular source module just as easily defines a subsection (incorporated via include-section) as a document.

A flow is a list of blocks.

A block is either a table, an itemization, a nested flow, a paragraph, a compound paragraph, a traverse block, or a delayed block.

- A table is an instance of table; it has a list of list of blocks corresponding to table cells.

- A itemization is an instance of itemization; it has a list of flows.

- A nested flow is an instance of nested-flow; it has a flow that is typeset as sub-flow.

- A paragraph is an instance of paragraph; it has a content:

  - An content can be a string, one of a few symbols, an instance of element (possibly link-element, etc.), a multiarg-element, a a traverse element, part-relative element, a delayed element, or a list of content.

    - A string is included in the result document verbatim, except for space, and unless the content’s enclosing style is 'hspace. In a style other than 'hspace, consecutive spaces in the output may be collapsed togther or replaced with a line break. In the style 'hspace, all text is converted to uncollapsable spaces that cannot be broken across lines.

    - A symbol content is either 'mdash, 'ndash, 'ldquo, 'lsquo, 'rsquo, 'larr, 'rarr, or 'prime; it is rendered as the corresponding HTML entity (even for Latex output).

    - An instance of element has a content plus a style. The style’s interpretation depends on the renderer, but it can be one of a few special symbols (such as 'bold) that are recognized by all renderers.

    - An instance of link-element has a tag for the target of the link.

    - An instance of target-element has a tag to be referenced by link-elements. An instance of the subtype toc-target-element is treated like a kind of section label, to be shown in the “on this page” table for HTML output.

    - An instance of index-element has a tag (as a target), a list of strings for the keywords (for sorting and search), and a list of contents to appear in the end-of-document index.

    - An instance of image-element incorporates an image from a file into the rendered document.

    - An instance of multiarg-element combines a style with a list of content, where the style corresponds to a rendered command that takes multiple arguments.

    - An instance of collect-element has a procedure that is called in the collect pass of document processing to record information used by later passes.

    - A traverse element is an instance of traverse-element, which ultimately produces content, but can accumulate and inspect information in the traverse pass.

    - A part-relative element is an instance of part-relative-element, which has a procedure that is called in the collect pass of document processing to obtain content. When the part-relative element’s procedure is called, collected information is not yet available, but information about the enclosing parts is available.

    - A delayed element is an instance of delayed-element, which has a procedure that is called in the resolve pass of document processing to obtain content.

    - An instance of render-element has a procedure that is called in the render pass of document processing.

- A compound paragraph is an instance of compound-paragraph; like blockquote, it has list of blocks, but the blocks are typeset as a single paragraph (e.g., no indentation after the first block) instead of inset.

- A traverse block is an instance of traverse-block, which ultimately produces another block, but can accumulate and inspect information during the traverse pass.

- A delayed block is an instance of delayed-block, which has a procedure that is called in the resolve pass of document processing to obtain a block.

##### 7.3.2`` Tags

A tag is a list containing a symbol and either a string, a generated-tag instance, or an arbitrary list. The symbol effectively identifies the type of the tag, such as 'part for a tag that links to a part, or 'def for a Racket function definition. The symbol also effectively determines the interpretation of the second half of the tag.

A part can have a tag prefix, which is effectively added onto the second item within each tag whose first item is 'part or 'tech. The prefix is added to a string value by creating a list containing the prefix and string, and it is added to a list value using cons; a prefix is not added to a generated-tag instance. The prefix is used for reference outside the part, including the use of tags in the part’s tags field. Typically, a document’s main part has a tag prefix that applies to the whole document; references to sections and defined terms within the document from other documents must include the prefix, while references within the same document omit the prefix. Part prefixes can be used within a document as well, to help disambiguate references within the document.

Some procedures accept a “tag” that is just the string part of the full tag, where the symbol part is supplied automatically. For example, section and secref both accept a string “tag”, where 'part is implicit.

##### 7.3.3`` Styles

A style combines a style name with a list of style properties in a style structure. A style name is either a string, symbol, of #f. A style property can be anything, including a symbol a structure such as color-property.

A style has a single style name, because the name typically corresponds to a configurable instruction to a renderer. For example, with Latex output, a string style name corresponds to a Latex command or environment. For more information on how string style names interact with configuration of a renderer, see Extending and Configuring Scribble Output. Symbolic style names, meanwhile, provide a simple layer of abstraction between the renderer and documents for widely supported style; for example, the 'italic style name is supported by all renderers.

Style properties within a style compose with style names and other properties. Again, symbols are often used for properties that are directly supported by renderers. For example, 'unnumbered style property for a part renders the part without a section number. Many properties are renderer-specific, such as a hover-property structure that associates text with an element to be shown in an HTML display when the mouse hovers over the text.

##### 7.3.4`` Collected and Resolved Information

The collect pass, resolve pass, and render pass processing steps all produce information that is specific to a rendering mode. Concretely, the operations are all represented as methods on a render% object.

The result of the collect method is a collect-info instance. This result is provided back as an argument to the resolve method, which produces a resolve-info value that encapsulates the results from both iterations. The resolve-info value is provided back to the resolve method for final rendering.

Optionally, before the resolve method is called, serialized information from other documents can be folded into the collect-info instance via the deserialize-info method. Other methods provide serialized information out of the collected and resolved records.

During the collect pass, the procedure associated with a collect-element instance can register information with collect-put!.

During the resolve pass, collected information for a part can be extracted with part-collected-info, which includes a part’s number and its parent part (or #f). More generally, the resolve-get method looks up information previously collected. This resolve-time information is normally obtained by the procedure associated with a delayed block or delayed element.

The resolve-get information accepts both a part and a resolve-info argument. The part argument enables searching for information in each enclosing part before sibling parts.

##### 7.3.5`` Structure Reference

( struct |  | part | ( | tag-prefix
|  |  |  | tags
|  |  |  | title-content
|  |  |  | style
|  |  |  | to-collect
|  |  |  | blocks
|  |  |  | parts)
|  | #:extra-constructor-name make-part)

tag-prefix : ( or/c false/c string?)
tags : ( listof tag?)
title-content : ( or/c false/c list?)
style : style?
to-collect : list?
blocks : ( listof block?)
parts : ( listof part?)

The tag-prefix field determines the optional tag prefix for the part.

The tags indicates a list of tags that each link to the section.

The title-content field holds the part’s title, if any.

For the style field, the currently recognized symbolic style names are as follows:

- 'index – The part represents an index.

The recognized style properties are as follows:

- 'unnumbered – A section number is computed for an unnumbered section during the collect pass, but the number is not rendered.

- 'toc – Sub-parts of the part are rendered on separate pages for multi-page HTML mode.

- 'non-toc – Initial sub-parts of the part are not rendered on separate pages for multi-page HTML mode; this style applies only to the main part.

- 'reveal – Shows sub-parts when this part is displayed in a table-of-contents panel in HTML output (which normally shows only the top-level sections).

- 'hidden – The part title is not shown in rendered HTML output.

- 'toc-hidden – The part title is not shown in tables of contents.

- 'quiet – In HTML output and most other output modes, hides entries for sub-parts of this part in a table-of-contents or local-table-of-contents listing except when those sub-parts are top-level entries in the listing.

- 'no-toc – As a style for the main part of a document, causes the HTML output to not include a margin box for the main table of contents; the “on this page” box that contains toc-element and toc-target-element links (and that only includes an “on this page” label for multi-page documents) takes on the location and color of the main table of contents, instead.

- document-version structure – A version number for this part and its sub-parts (except as overridden). When it is not "" may be used when rendering a document; at a minimum, a non-"" version is rendered when it is attached to a part representing the whole document. The default version for a document is ( version).

- body-id structure – Generated HTML uses the given string id attribute of the body tag; this style can be set separately for parts that start different HTML pages, otherwise it is effectively inherited by sub-parts; the default is "scribble-racket-lang.org", but setup-plt installs "doc-racket-lang.org" as the id for any document that it builds.

The to-collect field contains content that is inspected during the collect pass, but ignored in later passes (i.e., it doesn’t directly contribute to the output).

The blocks field contains the part’s initial flow (before sub-parts).

The parts field contains sub-parts.

( struct |  | paragraph (style content)
|  | #:extra-constructor-name make-paragraph)

style : style?
content : content?

A paragraph has a style and a content.

For the style field, a string style name corresponds to a CSS class for HTML output or a macro for Latex output (see Implementing Styles). The following symbolic style names are recognized:

- 'author – Typeset as the author of a document. Such paragraphs normally should appear only in the initial flow of a part for a document, where they are treated specially by the Latex renderer by moving the author information to the title.

The currently recognized style properties are as follows:

- 'omitable – When a table cell contains a single omitable-paragraph, then when rendering to HTML, no p tag wraps the cell content.

- 'div – Generates <div> HTML output instead of <p>.

- attributes structure – Provides additional HTML attributes for the <p> or <div> tag.

- body-id structure – For HTML, uses the given string as an id attribute of the <p> or <div> tag.

- 'never-indents – For Latex and compound paragraphs; see compound-paragraph.

( struct |  | table (style blockss)
|  | #:extra-constructor-name make-table)

style : style?
blockss : ( listof ( listof ( or/c block? ( one-of/c 'cont))))

A table has, roughly, a list of list of blocks. A cell in the table can span multiple columns by using 'cont instead of a block in the following columns (i.e., for all but the first in a set of cells that contain a single block).

Within style, a string style name corresponds to a CSS class for HTML output or an environment for Latex output (see Implementing Styles). The following symbolic style names are also recognized:

- 'boxed – Renders as a definition.

- 'centered – Centers HTML output horizontally.

The following style properties are currently recognized:

- table-columns structure – Provides column-specific styles, but only if a table-cells structure is not included as a style property.

- table-cells structure – Provides cell-specific styles.

- attributes structure – Provides additional HTML attributes for the <table> tag.

- body-id structure – For HTML, uses the given string as an id attribute of the <table> tag.

- 'aux – For HTML, include the table in the table-of-contents display for the enclosing part.

- 'never-indents – For Latex and compound paragraphs; see compound-paragraph.

For Latex output, a paragraph as a cell value is not automatically line-wrapped, unless a vertical alignment is specified for the cell through a table-cells or table-columns style property. To get a line-wrapped paragraph, use a compound-paragraph or use an element with a string style and define a corresponding Latex macro in terms of parbox. For Latex output of blocks in the flow that are nested-flows, itemizations, compound-paragraphs, or delayed-blocks, the block is wrapped with minipage using linewidth divided by the column count as the width.

( struct |  | itemization (style blockss)
|  | #:extra-constructor-name make-itemization)

style : style?
blockss : ( listof ( listof block?))

A itemization has a style and a list of flows.

In style, a string style name corresponds to a CSS class for HTML output or a macro for Latex output (see Implementing Styles). In addition, the following symbolic style names are recognized:

- 'compact – Reduces space between items.

- 'ordered – Generates <ol> HTML output instead of <ul> or an Latex enumeration instead of an itemization.

The following style properties are currently recognized:

- attributes structure – Provides additional HTML attributes for the <ul> or <ol> tag.

- body-id structure – For HTML, uses the given string as an id attribute of the <ul> or <ol> tag.

- 'never-indents – For Latex and compound paragraphs; see compound-paragraph.

( struct |  | nested-flow (style blocks)
|  | #:extra-constructor-name make-nested-flow)

style : any/c
blocks : ( listof block?)

A nested flow has a style and a flow.

In style, the "style name" is normally a string that corresponds to a CSS class for HTML blockquote output or a Latex environment (see Implementing Styles). The following symbolic style names are recognized:

- 'inset – Insets the nested flow relative to surrounding text.

The following style properties are currently recognized:

- 'command – For Latex output, a string style name is used as a command name instead of an environment name.

- attributes structure – Provides additional HTML attributes for the <blockquote> tag.

- body-id structure – For HTML, uses the given string as an id attribute of the <blockquote> tag.

- 'never-indents – For Latex and compound paragraphs; see compound-paragraph.

( struct |  | compound-paragraph (style blocks)
|  | #:extra-constructor-name make-compound-paragraph)

style : style?
blocks : ( listof block?)

A compound paragraph has a style and a list of blocks.

For HTML, a paragraph block in blocks is rendered without a <p> tag, unless the paragraph has a style with a non-#f style name. For Latex, each block in blocks is rendered with a preceding \noindent, unless the block has the 'never-indents property (checking recursively in a nested-flow or compound-paragraph if the nested-flow or compound-paragraph itself has no 'never-indents property).

The style field of a compound paragraph is normally a string that corresponds to a CSS class for HTML output or Latex environment for Latex output (see Implementing Styles). The following style properties are currently recognized:

- 'command – For Latex output, a string style name is used as a command name instead of an environment name.

- attributes structure – Provides additional HTML attributes for the <p> tag.

- body-id structure – For HTML, uses the given string as an id attribute of the <p> tag.

- 'never-indents – For Latex within another compound paragraph; see above.

( struct |  | traverse-block (traverse)
|  | #:extra-constructor-name make-traverse-block)

traverse : block-traverse-procedure/c

Produces another block during the traverse pass, eventually. The traverse procedure is called with procedures to get and set symbol-keyed information, and it should return either a block (which effectively takes the traverse-block’s place) or a procedure like traverse to be called in the next iteration of the traverse pass.

All traverse-element and traverse-blocks that have not been replaced are forced in document order relative to each other during an iteration of the traverse pass.

( struct |  | delayed-block (resolve)
|  | #:extra-constructor-name make-delayed-block)

resolve : ( any/c part? resolve-info? . -> . block?)

The resolve procedure is called during the resolve pass to obtain a normal block. The first argument to resolve is the renderer.

( struct |  | element (style content)
|  | #:extra-constructor-name make-element)

style : element-style?
content : content?

Styled content within an enclosing paragraph or other content.

The style field can be a style structure, but it can also be just a style name.

In style, a string style name corresponds to a CSS class for HTML output and a macro name for Latex output (see Implementing Styles). The following symbolic style names are recognized:

- 'tt, 'italic, 'bold, 'sf, 'url, 'subscript, 'superscript, 'smaller, 'larger – Basic styles recognized by all renders.

- 'hspace – Renders its content as monospace blanks.

- 'newline – Renders a line break independent of the content.

The following style properties are currently recognized:

- target-url structure – Generates a hyperlink.

- url-anchor structure – For HTML, inserts a hyperlink target before content.

- color-property structure – Applies a color to the text of content.

- background-color-property structure – Applies a color to the background of content.

- attributes structure – Provides additional HTML attributes for a <span> tag.

- hover-property structure – For HTML, adds a text label to the content to be shown when the mouse hovers over it.

- script-property structure – For HTML, supplies a script alternative to content.

- body-id structure – For HTML uses the given string as an id attribute of the span tag.

- 'aux – Intended for use in titles, where the auxiliary part of the title can be omitted in hyperlinks. See, for example, secref.

- 'tt-chars – For Latex output, when the style name is a string, render the element’s content with escapes suitable for Latex tt mode.

- 'exact-chars – For Latex output, when the style name is a string, render the elements content exactly (without escapes).

( struct |  | image-element element (path suffixes scale)
|  | #:extra-constructor-name make-image-element)

path

:

( or/c path-string?
( cons/c 'collects ( listof bytes?)))

suffixes : ( listof #rx"^[.]")
scale : real?

Used as a style for an element to inline an image. The path field can be a result of path->main-collects-relative.

For each string in suffixes, if the rendered works with the corresponding suffix, the suffix is added to path and used if the resulting path refers to a file that exists. The order in suffixes determines the order in which suffixes are tried. The HTML renderer supports ".png" and ".gif", while the Latex renderer supports ".png", ".pdf", and ".ps" (but rendering Latex output to PDF will not work with ".ps" files, while rendering to Latex DVI output works only with ".ps" files). If suffixes is empty or if none of the suffixes lead to files that exist, path is used as-is.

The scale field scales the image in its rendered form.

( struct |  | target-element element (tag)
|  | #:extra-constructor-name make-target-element)

tag : tag?

Declares the content as a hyperlink target for tag.

( struct |  | toc-target-element target-element ()
|  | #:extra-constructor-name make-toc-target-element)

Like target-element, the content is also a kind of section label to be shown in the “on this page” table for HTML output.

( struct |  | page-target-element target-element ()
|  | #:extra-constructor-name make-page-target-element)

Like target-element, but a link to the element goes to the top of the containing page.

( struct |  | redirect-target-element target-element | ( | alt-path
|  |  |  | alt-anchor)
|  | #:extra-constructor-name make-redirect-target-element)

alt-path : path-string?
alt-anchor : string?

Like target-element, but a link to the element is redirected to the given URL.

( struct |  | toc-element element (toc-content)
|  | #:extra-constructor-name make-toc-element)

toc-content : content?

Similar to toc-target-element, but with specific content for the “on this page” table specified in the toc-content field.

( struct |  | link-element element (tag)
|  | #:extra-constructor-name make-link-element)

tag : tag?

Hyperlinks the content to tag.

When tag is a part tag and the content of the element is null, then the hyperlink uses the target part’s number and/or title as the content. In that case, if the section number is preceded by a word, the word starts in uppercase if the element’s style includes a 'uppercase property.

( struct |  | index-element element (tag plain-seq entry-seq desc)
|  | #:extra-constructor-name make-index-element)

tag : tag?
plain-seq : ( and/c pair? ( listof string?))
entry-seq : ( listof content?)
desc : any/c

The plain-seq specifies the keys for sorting, where the first string is the main key, the second is a sub-key, etc. For example, an “night” portion of an index might have sub-entries for “night, things that go bump in” and “night, defender of the”. The former would be represented by plain-seq '("night" "things that go bump in"), and the latter by '("night" "defender of the"). Naturally, single-string plain-seq lists are the common case, and at least one word is required, but there is no limit to the word-list length. The strings in plain-seq must not contain a newline character.

The entry-seq list must have the same length as plain-seq. It provides the form of each key to render in the final document.

The desc field provides additional information about the index entry as supplied by the entry creator. For example, a reference to a procedure binding can be recognized when desc is an instance of procedure-index-desc. See scribble/manual-struct for other typical types of desc values.

See also index.

( struct |  | multiarg-element (style content)
|  | #:extra-constructor-name make-multiarg-element)

style : element-style?
content : ( listof content?)

Like element with a list for content, except that for Latex output, if the style name in style is a string, then it corresponds to a Latex command that accepts as many arguments (each in curly braces) as elements of content.

( struct |  | traverse-element (traverse)
|  | #:extra-constructor-name make-traverse-element)

traverse : element-traverse-procedure/c

Like traverse-block, but the traverse procedure must eventually produce content, rather than a block.

( struct |  | delayed-element (resolve sizer plain)
|  | #:extra-constructor-name make-delayed-element)

resolve : ( any/c part? resolve-info? . -> . list?)
sizer : (-> any/c)
plain : (-> any/c)

The render procedure’s arguments are the same as for delayed-block, but the result is content. Unlike delayed-block, the result of the render procedure’s argument is remembered on the first call for re-use for a particular resolve pass.

The sizer field is a procedure that produces a substitute content for the delayed element for the purposes of determining the delayed element’s width (see element-width).

The plain field is a procedure that produces a substitute content when needed before the collect pass, such as when element->string is used before the collect pass.

( struct |  | part-relative-element (resolve sizer plain)
|  | #:extra-constructor-name make-part-relative-element)

resolve : ( collect-info? . -> . list?)
sizer : (-> any/c)
plain : (-> any/c)

Similar to delayed-block, but the replacement content is obtained in the collect pass by calling the function in the resolve field.

The resolve function can call collect-info-parents to obtain a list of parts that enclose the element, starting with the nearest enclosing section. Functions like part-collected-info and collected-info-number can extract information like the part number.

( struct |  | collect-element element (collect)
|  | #:extra-constructor-name make-collect-element)

collect : ( collect-info . -> . any)

Like element, but the collect procedure is called during the collect pass. The collect procedure normally calls collect-put!.

Unlike delayed-element or part-relative-element, the element remains intact (i.e., it is not replaced) by either the collect pass or resolve pass.

( struct |  | render-element element (render)
|  | #:extra-constructor-name make-render-element)

render : ( any/c part? resolve-info? . -> . any)

Like delayed-element, but the render procedure is called during the render pass.

If a render-element instance is serialized (such as when saving collected info), it is reduced to a element instance.

( struct |  | collected-info (number parent info)
|  | #:extra-constructor-name make-collected-info)

number : ( listof ( or/c false/c integer?))
parent : ( or/c false/c part?)
info : any/c

Computed for each part by the collect pass.

( struct |  | target-url (addr)
|  | #:extra-constructor-name make-target-url)

addr : path-string?

Used as a style property for an element. A path is allowed for addr, but a string is interpreted as a URL rather than a file path.

( struct |  | document-version (text)
|  | #:extra-constructor-name make-document-version)

text : ( or/c string? false/c)

Used as a style property for a path to indicate a version number.

( struct |  | color-property (color)
|  | #:extra-constructor-name make-color-property)

color : ( or/c string? ( list/c byte? byte? byte?))

Used as a style property for an element to set its color. Recognized string names for color depend on the renderer, but at the recognized set includes at least "white", "black", "red", "green", "blue", "cyan", "magenta", and "yellow". When color is a list of bytes, the values are used as RGB levels.

( struct |  | background-color-property (color)
|  | #:extra-constructor-name make-background-color-property)

color : ( or/c string? ( list/c byte? byte? byte?))

Like color-property, but sets the background color.

( struct |  | table-cells (styless)
|  | #:extra-constructor-name make-table-cells)

styless : ( listof ( listof style?))

Used as a style property for a table to set its cells’ styles.

If a cell style has a string name, it is used as an HTML class for the <td> tag or as a Latex command name.

The following symbols are recognized as cell-style properties:

- 'left – Left-align the cell content.

- 'right – Right-align the cell content top baselines.

- 'center – Center the cell content horizontally.

- 'top – Top-align the cell content.

- 'baseline – Align the cell content top baselines.

- 'bottom – bottom-align the cell content.

- 'vcenter – Center the cell content vertically.

In addition, for HTML output, attributes structures as style properties can add arbitrary attributes to a cell’s <td> tag.

( struct |  | table-columns (styles)
|  | #:extra-constructor-name make-table-columns)

styles : ( listof style?)

Like table-cells, but the styles list is duplicated for each row in the table. This style property is used only when a table-cells is not present in a style’s list of properties.

( block? v) → boolean?
v : any/c

Returns #t if v is a paragraph, table, itemization, nested-flow, traverse-block, or delayed-block, #f otherwise.

( content? v) → boolean?
v : any/c

Returns #t if v is a string, symbol, element, multiarg-element, traverse-element, delayed-element, part-relative-element, or list of content, #f otherwise.

( struct |  | style (name properties)
|  | #:extra-constructor-name make-style)

name : ( or/c string? symbol? #f)
properties : list?

Represents a style.

plain : style?

A style ( make-style #f null).

( element-style? v) → boolean?
v : any/c

Returns #t if v is a string, symbol, #f, or style structure.

( tag? v) → boolean?
v : any/c

Returns #t if v is acceptable as a link tag, which is a list containing a symbol and either a string, a generated-tag instance, or a list (of arbitrary values).

( struct |  | generated-tag ()
|  | #:extra-constructor-name make-generated-tag)

A placeholder for a tag to be generated during the collect pass. Use tag-key to convert a tag containing a generated-tag instance to one containing a string.

( content->string content) → string?
content : content?
( content->string content renderer p info) → string?
content : content?
renderer : any/c
p : part?
info : resolve-info?

Converts content to a single string (essentially rendering the content as “plain text”).

If p and info arguments are not supplied, then a pre-“collect” substitute is obtained for delayed elements. Otherwise, the two arguments are used to force the delayed element (if it has not been forced already).

( content-width c) → exact-nonnegative-integer?
c : content?

Returns the width in characters of the given content.

( block-width e) → exact-nonnegative-integer?
e : block?

Returns the width in characters of the given block.

( struct |  | collect-info | ( | ht
|  |  |  | ext-ht
|  |  |  | parts
|  |  |  | tags
|  |  |  | gen-prefix
|  |  |  | relatives
|  |  |  | parents)
|  | #:extra-constructor-name make-collect-info)

ht : any/c
ext-ht : any/c
parts : any/c
tags : any/c
gen-prefix : any/c
relatives : any/c
parents : ( listof part?)

Encapsulates information accumulated (or being accumulated) from the collect pass. The fields are exposed, but not currently intended for external use, except that collect-info-parents is intended for external use.

( struct |  | resolve-info (ci delays undef)
|  | #:extra-constructor-name make-resolve-info)

ci : any/c
delays : any/c
undef : any/c

Encapsulates information accumulated (or being accumulated) from the resolve pass. The fields are exposed, but not currently intended for external use.

( info-key? v) → boolean?
v : any/c

Returns #t if v is an info key: a list of at least two elements whose first element is a symbol. The result is #f otherwise.

For a list that is an info tag, the interpretation of the second element of the list is effectively determined by the leading symbol, which classifies the key. However, a #f value as the second element has an extra meaning: collected information mapped by such info keys is not propagated out of the part where it is collected; that is, the information is available within the part and its sub-parts, but not in ancestor or sibling parts.

Note that every tag is an info key.

( collect-put! ci key val) → void?
ci : collect-info?
key : info-key?
val : any/c

Registers information in ci. This procedure should be called only during the collect pass.

( resolve-get p ri key) → any/c
p : ( or/c part? false/c)
ri : resolve-info?
key : info-key?

Extract information during the resolve pass or render pass for p from ri, where the information was previously registered during the collect pass. See also Collected and Resolved Information.

The result is #f if the no value for the given key is found. Furthermore, the search failure is recorded for potential consistency reporting, such as when racket setup is used to build documentation.

( resolve-get/ext? p ri key)

→

any/c |  | boolean?

p : ( or/c part? false/c)
ri : resolve-info?
key : info-key?

Like render-get, but returns a second value to indicate whether the resulting information originated from an external source (i.e., a different document).

( resolve-search dep-key p ri key) → void?
dep-key : any/c
p : ( or/c part? false/c)
ri : resolve-info?
key : info-key?

Like resolve-get, but a shared dep-key groups multiple searches as a single request for the purposes of consistency reporting and dependency tracking. That is, a single success for the same dep-key means that all of the failed attempts for the same dep-key have been satisfied. However, for dependency checking, such as when using racket setup to re-build documentation, all attempts are recorded (in case external changes mean that an earlier attempt would succeed next time).

( resolve-get/tentative p ri key) → any/c
p : ( or/c part? false/c)
ri : resolve-info?
key : info-key?

Like resolve-search, but without dependency tracking. For multi-document settings where dependencies are normally tracked, such as when using racket setup to build documentation, this function is suitable for use only for information within a single document.

( resolve-get-keys p ri pred) → list?
p : ( or/c part? false/c)
ri : resolve-info?
pred : ( info-key? . -> . any/c)

Applies pred to each key mapped for p in ri, returning a list of all keys for which pred returns a true value.

( part-collected-info p ri) → collected-info?
p : part?
ri : resolve-info?

Returns the information collected for p as recorded within ri.

( tag-key t ri) → tag?
t : tag?
ri : resolve-info?

Converts a generated-tag value with t to a string.

( traverse-block-block b i) → block?
b : traverse-block?
i : ( or/c resolve-info? collect-info?)

Produces the block that replaces b.

( traverse-element-content e i) → content?
e : traverse-element?
i : ( or/c resolve-info? collect-info?)

Produces the content that replaces e.

block-traverse-procedure/c : contract?

Defined as

( recursive-contract
(( symbol? any/c . -> . any/c)
( symbol? any/c . -> . any)
. -> . ( or/c block-traverse-procedure/c
block?)))

element-traverse-procedure/c : contract?

Defined as

( recursive-contract
(( symbol? any/c . -> . any/c)
( symbol? any/c . -> . any)
. -> . ( or/c element-traverse-procedure/c
content?)))

##### 7.3.6`` HTML Style Properties

( require scribble/html-properties)

The scribble/html-properties library provides datatypes used as style properties for HTML rendering.

( struct |  | attributes (assoc)
|  | #:extra-constructor-name make-attributes)

assoc : ( listof ( cons/c symbol? string?))

Used as a style property to add arbitrary attributes to an HTML tag.

( struct |  | url-anchor (name)
|  | #:extra-constructor-name make-url-anchor)

name : string?

Used as a style property with element to insert an anchor before the element.

( struct |  | hover-property (text)
|  | #:extra-constructor-name make-hover-property)

text : string?

Used as a style property with element to add text that is shown when the mouse hovers over the element.

( struct |  | script-property (type script)
|  | #:extra-constructor-name make-script-property)

type : string?
script : ( or/c path-string? ( listof string?))

Used as a style property with element to supply a script alternative to the element content.

( struct |  | css-addition (path)
|  | #:extra-constructor-name make-css-addition)

path

:

( or/c path-string?
( cons/c 'collects ( listof bytes?)))

Used as a style property to supply a CSS file to be referenced in the generated HTML. This property can be attached to any style, and all additions are collected to the top of the generated HTML page.

The path field can be a result of path->main-collects-relative.

( struct |  | body-id (value)
|  | #:extra-constructor-name make-body-id)

value : string?

Used as a style property to associate an id attribute with an HTML tag.

( struct |  | html-defaults (prefix style extra-files)
|  | #:extra-constructor-name make-html-defaults)

prefix

:

( or/c bytes? path-string?
( cons/c 'collects ( listof bytes?)))

style

:

( or/c bytes? path-string?
( cons/c 'collects ( listof bytes?)))

extra-files

:

( listof ( or/c path-string?
( cons/c 'collects ( listof bytes?))))

Like latex-defaults, but use for the scribble command-line tool’s --html and --htmls modes.

##### 7.3.7`` Latex Style Properties

( require scribble/latex-properties)

The scribble/latex-properties library provides datatypes used as style properties for Latex rendering.

( struct |  | tex-addition (path)
|  | #:extra-constructor-name make-tex-addition)

path

:

( or/c path-string?
( cons/c 'collects ( listof bytes?)))

Used as a style property to supply a ".tex" file to be included in the generated Latex. This property can be attached to any style, and all additions are collected to the top of the generated Latex file.

The path field can be a result of path->main-collects-relative.

( struct |  | latex-defaults (prefix style extra-files)
|  | #:extra-constructor-name make-latex-defaults)

prefix

:

( or/c bytes? path-string?
( cons/c 'collects ( listof bytes?)))

style

:

( or/c bytes? path-string?
( cons/c 'collects ( listof bytes?)))

extra-files

:

( listof ( or/c path-string?
( cons/c 'collects ( listof bytes?))))

Used as a style property on the main part of a document to set a default prefix file, style file, and extra files (see Configuring Output). The defaults are used by the scribble command-line tool for and --latex or --pdf mode if none are supplied via --prefix and --style (where extra-files are used only when prefix is used). A byte-string value is used directly like file content, and a path can be a result of path->main-collects-relative.

Languages (used with #lang) like scribble/manual and scribble/sigplan add this property to a document to specify appropriate files for Latex rendering.

( struct |  | latex-auto-extra-files (paths)
|  | #:extra-constructor-name make-latex-auto-extra-files)

paths

:

( listof ( or/c path-string?
( cons/c 'collects ( listof bytes?))))

Used as a style property for the main part of a document to supply extra files needed to build the document via the scribble command-line tool (for --latex and --pdf mode).

Languages (used with #lang) like scribble/sigplan add this property to a document to specify appropriate extra files.

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