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68 lines
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2.5 KiB
Markdown
68 lines
No EOL
2.5 KiB
Markdown
Message Markup
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==============
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[Back](index.md)
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[Message Markup (XEP-0394)](https://xmpp.org/extensions/xep-0394.html) can be used as an alternative to XHTML-IM to style messages, while keeping the body and markup information strictly separated.
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This implementation can *not* be used to render message bodies, but will offer a simple to use interface for creating ExtensionElements which encode the markup information.
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## Usage
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The most important class is the `MarkupElement` class, which contains a Builder.
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To start creating a Message Markup Extension, call `MarkupElement.getBuilder()`.
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(Almost) all method calls documented below will be made on the builder.
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Whenever a method call receives a `start` and `end` index, `start` represents the first character, which is affected by the styling, while `end` is the character *after* the last affected character.
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### Inline styling
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Currently there are 3 styles available:
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* *emphasis*, which should be rendered by a client as *italic*, or **bold**
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* *code*, which should be rendered in `monospace`
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* *deleted*, which should be rendered as ~~strikethrough~~.
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Those styles are available by calling `builder.setEmphasis(int start, int end)`,
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`builder.setDeleted(int start, int end)` and `builder.setCode(int start, int end)`.
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If you want to apply multiple inline styles to a section, you can do the following:
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```
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Set<SpanElement.SpanStyle> spanStyles = new HashSet<>();
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styles.add(SpanElement.SpanStyle.emphasis);
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styles.add(SpanElement.SpanStyle.deleted);
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builder.addSpan(start, end, spanStyles);
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```
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Note, that spans cannot overlap one another.
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### Block Level Styling
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Available block level styles are:
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* Code blocks, which should be rendered as
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```
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blocks
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of
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code
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```
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* Itemized lists, which should render as
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* Lists
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* with possibly multiple
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* entries
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* Block Quotes, which should be rendered by the client
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> as quotes, which
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>> also can be nested
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To mark a section as code block, call `builder.setCodeBlock(start, end)`.
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To create a list, call `MarkupElement.Builder.ListBuilder lbuilder = builder.beginList()`, which will return a list builder.
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On this you can call `lbuilder.addEntry(start, end)` to add an entry.
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Note: If you add an entry, the start value MUST be equal to the end value of the previous added entry!
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To end the list, call `lbuilder.endList()`, which will return the MessageElement builder.
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To create a block quote, call `builder.setBlockQuote(start, end)`.
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Note that block level elements MUST NOT overlap each other boundaries, but may be fully contained (nested) within each other. |