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comment_block.rs
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comment_block.rs
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use std::io::Write;
use liquid_core::parser::BlockElement;
use liquid_core::Language;
use liquid_core::Renderable;
use liquid_core::Result;
use liquid_core::Runtime;
use liquid_core::{BlockReflection, ParseBlock, TagBlock, TagTokenIter};
#[derive(Copy, Clone, Debug, Default)]
pub struct CommentBlock;
impl CommentBlock {
pub fn new() -> Self {
Self
}
}
impl BlockReflection for CommentBlock {
fn start_tag(&self) -> &str {
"comment"
}
fn end_tag(&self) -> &str {
"endcomment"
}
fn description(&self) -> &str {
""
}
}
impl ParseBlock for CommentBlock {
fn parse(
&self,
mut arguments: TagTokenIter<'_>,
mut tokens: TagBlock<'_, '_>,
options: &Language,
) -> Result<Box<dyn Renderable>> {
// no arguments should be supplied, trying to supply them is an error
arguments.expect_nothing()?;
while let Some(token) = tokens.next()? {
// Only needs to parse tags. Expressions and raw text will never have side effects.
if let BlockElement::Tag(tag) = token {
if tag.name() == self.start_tag() {
// Parses `{% comment %}` tags (in order to allow nesting)
tag.parse(&mut tokens, options)?;
} else {
// Other tags are parsed (because of possible side effects, such as in `{% raw %}`)
// But their errors are ignored
let _ = tag.parse(&mut tokens, options);
}
}
}
tokens.assert_empty();
Ok(Box::new(Comment))
}
fn reflection(&self) -> &dyn BlockReflection {
self
}
}
#[derive(Copy, Clone, Debug)]
struct Comment;
impl Renderable for Comment {
fn render_to(&self, _writer: &mut dyn Write, _runtime: &dyn Runtime) -> Result<()> {
Ok(())
}
}
#[cfg(test)]
mod test {
use super::*;
use liquid_core::parser;
use liquid_core::runtime;
use liquid_core::runtime::RuntimeBuilder;
fn options() -> Language {
let mut options = Language::default();
options
.blocks
.register("comment".to_string(), CommentBlock.into());
options
}
fn unit_parse(text: &str) -> String {
let options = options();
let template = parser::parse(text, &options)
.map(runtime::Template::new)
.unwrap();
let runtime = RuntimeBuilder::new().build();
template.render(&runtime).unwrap()
}
#[test]
fn test_comment() {
let output = unit_parse("{% comment %} This is a test {% endcomment %}");
assert_eq!(output, "");
}
}