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124 lines
4.4 KiB
124 lines
4.4 KiB
4 years ago
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Included in:
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- user-manual: Customizing the Cross Reference
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Starting in Asciidoctor 1.5.6, when you use one of the native converters (HTML, PDF, and EPUB3), you can customize the style of the automatic cross reference text using the `xrefstyle` document attribute.
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This customization brings the cross reference text formatting from the DocBook toolchain to the native Asciidoctor converters.
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By default, the cross reference text matches the title of the referenced element.
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For example, if you're linking to a section titled “Installation”, the text of the cross reference link appears as:
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====
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Installation
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====
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If the reftext attribute is specified on the referenced element, that value is preferred over its title.
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For example, let's assume the section from the previous example was written as:
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[source]
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----
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[reftext="Installation Procedure"]
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=== Installation
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----
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In this case, the text of the cross reference link appears as:
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====
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Installation Procedure
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====
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Attribute references are substituted in the reftext during parsing and reftext substitutions (specialchars, quotes, and replacements) are applied to the value when it's used during conversion.
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If the reftext is not specified, the text of the cross reference is automatically generated.
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By default, this text is the title of the reference.
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There are three built-in styles you can choose from to customize the generated text of a cross reference, as controlled by the xrefstyle document attribute.
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:xrefstyle: full:: Uses the signifier for the reference (e.g., Section) followed by the reference number and emphasized (chapter or appendix) or quoted title (e.g., Section 2.3, “Installation” or Figure 1, “Big Cats”).
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:xrefstyle: short:: Uses the signifier for the reference (e.g., Section) followed by the reference number (e.g., Section 2.3 or Figure 1).
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:xrefstyle: basic:: Uses the title only (Installation or Big Cats), applying emphasis if the reference is a chapter or appendix.
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This formatting only applies to references that have both a title and number (or explicit caption), but no explicit reftext.
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If the reference is a chapter or an appendix, the title is displayed in italics instead of quotes (even when the xrefstyle is basic).
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Let's assume you want to reference a section titled “Installation” that has the number 2.3.
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The *full* style is displayed as:
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====
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Section 2.3, “Installation”
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====
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The *short* style is displayed as:
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====
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Section 2.3
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====
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The *basic* style is displayed as:
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====
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Installation
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====
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The *full* and *short* styles only apply for references that have a caption.
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Specifically, the corresponding `*-caption` attribute must be set for the target's block type (e.g., `listing-caption` for listing blocks, `example-caption` for example blocks, `table-caption` for tables, etc.).
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Otherwise, the *basic* style is used.
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You can use document attributes to customize the signifier that is placed in front of the reference's number.
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This [.term]_reference signifier_ indicates the reference's type (e.g., Chapter or Section).
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* `chapter-refsig` -- defines the signifier to use for a cross reference to a chapter (default: Chapter)
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* `section-refsig` -- defines the signifier to use for a cross reference to a section (default: Section)
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* `appendix-refsig` -- defines the signifier to use for a cross reference to an appendix (default: Appendix)
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(The signifier attribute for a part cross reference will be introduced once numeration is supported for parts).
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For example, to customize the word “Section”, define the `section-refsig` attribute in the document header:
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[source]
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----
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:section-refsig: Sect.
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----
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The *full* xrefstyle would then be displayed as:
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====
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Sect. 2.3, “Installation”
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====
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The *short* xrefstyle would be displayed as:
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====
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Sect. 2.3
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====
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If you unset the attribute, the signifier is dropped from the cross reference text.
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For example:
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[source]
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----
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:!section-refsig:
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----
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In this case, the *full* xrefstyle will display only the number and title:
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====
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2.3, “Installation”
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====
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The *short* xrefstyle will fall back to the number only:
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====
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2.3
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====
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The *basic* xrefstyle is unaffected by the value of the signifier.
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Only the aforementioned styles are provided out of the box.
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Support for a custom formatting string is planned.
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Refer to {issue-ref}/2212[#2212] for details.
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Until then, you can implement custom formatting in a custom converter or overridding the xreftext method on the node.
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