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119 lines
4.1 KiB
119 lines
4.1 KiB
4 years ago
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Included in:
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- user-manual: Text Substitutions: Applying substitutions
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////
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Specific substitution elements can be applied to any block or paragraph by setting the `subs` attribute.
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The `subs` attribute can be assigned a comma separated list of the following substitution elements and groups.
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// tag::group[]
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[horizontal]
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`none`:: Disables substitutions
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`normal`:: Performs all substitutions except for callouts
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`verbatim`:: Replaces special characters and processes callouts
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`specialchars`, `specialcharacters`:: Replaces `<`, `>`, and `&` with their corresponding entities
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`quotes`:: Applies text formatting
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`attributes`:: Replaces attribute references
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`replacements`:: Substitutes textual and character reference replacements
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`macros`:: Processes macros
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`post_replacements`:: Replaces the line break character (`{plus}`)
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// end::group[]
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Let's look at an example where you only want to process special characters, formatting markup, and callouts in a literal block.
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By default, literal blocks are only subject to special characters substitution.
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But you can change this behavior by setting the `subs` attribute in the block's attribute list.
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....
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include::ex-subs.adoc[tag=subs-in]
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....
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<1> The subs attribute is set in the attribute list and assigned the `verbatim` and `quotes` values.
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<2> The formatting markup in this line will be replaced when the quotes substitution runs.
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====
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include::ex-subs.adoc[tag=subs-out]
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====
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<1> The `verbatim` value enables the callouts to be processed.
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<2> The `quotes` value enables the text formatting to be processed.
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[TIP]
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====
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If you are applying the same set of substitutions to numerous blocks, you should consider making them an attribute entry to ensure consistency.
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[source]
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....
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include::ex-subs.adoc[tag=subs-attr]
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....
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Another way to ensure consistency and keep your documents clean and simple is to use the <<user-manual#tree-processor-example,TreeProcessor extension>>.
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====
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=== Incremental Substitutions
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When you set the subs attribute on a block, you automatically remove all of its default substitutions.
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For example, if you set subs on a literal block, and assign it a value of `attributes`, only attributes are substituted.
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The verbatim substitution will not be applied.
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To remedy this situation, Asciidoctor provides a syntax to append or remove substitutions instead of replacing them outright.
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You can add or remove a substitution from the default substitution list using the plus (`+`) and minus (`-`) modifiers.
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These are known as [.term]_incremental substitutions_.
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[horizontal]
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`<substitution>+`::
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Prepends the substitution to the default list.
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`+<substitution>`::
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Appends the substitution to the default list.
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`-<substitution>`::
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Removes the substitution from the default list.
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For example, you can add the `attributes` substitution to a listing block's default substitution list.
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.Add attributes substitution to a default substitution list
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[source]
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....
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include::ex-subs.adoc[tag=subs-add]
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....
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Similarly, you can remove the `callouts` substitution.
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.Remove callouts substitution from a default substitution list
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[source,subs=-callouts]
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....
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include::ex-subs.adoc[tag=subs-sub]
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....
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You can also specify whether the substitution is placed at the beginning or end of the substitution list.
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If a `+` comes before the name of the substitution, then it's added to the end of the existing list, and if a `+` comes after the name, it's added to the beginning of the list.
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[source,subs=-callouts]
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....
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include::ex-subs.adoc[tag=subs-multi]
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....
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In the above example, the quotes, then the special characters, and then the attributes substitutions will be applied to the listing block.
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// NOTE: More examples are pending. Information about the callouts substitution also needs to be included here.
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==== Applying Substitutions to Inline Elements
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Custom substitutions can also be applied to some inline elements, such as the <<user-manual#pass-macros,pass macro>>.
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For example, the quotes text substitution value is assigned in the inline pass macro below.
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[source]
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----
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include::ex-pass.adoc[tag=s-macro]
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----
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====
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include::ex-pass.adoc[tag=s-macro]
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====
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