108 lines
2.1 KiB
Markdown
108 lines
2.1 KiB
Markdown
# Tags
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## Code block
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You can write Rust statement inside `<% %>` tag.
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=== "Template"
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``` rhtml
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<%
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let mut total = 0;
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for i in 1.. {
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total += i;
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if i > 100 {
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break;
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}
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}
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%>
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<div>total = <%\html total %></div>
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```
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=== "Result"
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``` html
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<div>total = 105</div>
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```
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!!! Note
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Make sure that you cannot omit braces, parenthesis, and semicolons.
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Sailfish is smart enough to figure out where the code block ends, so you can even include `%>` inside Rust comments or string literals.
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=== "Template"
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``` text
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<% /* Tag does not ends at %>! */ %>
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```
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=== "Result"
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``` text
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```
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If you need to simply render `<%` character, you can escape it, or use evaluation block (described below).
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=== "Template"
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``` text
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<%% is converted into <%- "<%" %> character.
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```
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=== "Result"
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``` text
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<% is converted into <% character
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```
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Although almost all Rust statement is supported, the following statements inside templates may cause a strange compilation error.
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- Function/Macro definition that render some contents
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- `impl` item
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- Macro call which defines some local variable.
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- Macro call which behaviour depends on the path to source file
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- Generator expression (yield)
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## Evaluation block
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Rust expression inside `<%\mode %>` tag is evaluated and the result will be rendered.
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=== "Template"
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``` rhtml
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<% let a = 1; %><%\html a + 2 %>
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```
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=== "Result"
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``` text
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3
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```
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If the result contains `&"'<>` characters, sailfish replaces these characters with the equivalent html.
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If you want to render the results without escaping, you can use `<%- %>` tag.
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=== "Template"
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``` rhtml
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<div>
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<%- "<h1>Hello, World!</h1>" %>
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</div>
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```
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=== "Result"
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``` html
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<div>
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<h1>Hello, World!</h1>
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</div>
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```
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!!! Note
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Evaluation block does not return any value, so you cannot use the block to pass the render result to another code block. The following code is invalid.
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``` rhtml
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<% let result = %><%\html 1 %><% ; %>
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```
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