mrml 6.0.0

Rust implementation of MJML renderer
Documentation 
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use htmlparser::StrSpan;

use super::MjRawChild;
use crate::comment::Comment;
use crate::conditional_comment::ConditionalComment;
use crate::node::Node;
use crate::prelude::is_void_element;
use crate::prelude::parser::{
    parse_attributes_map, Error, MrmlCursor, MrmlParser, MrmlToken, ParseChildren, ParseElement,
};
#[cfg(feature = "async")]
use crate::prelude::parser::{AsyncMrmlParser, AsyncParseChildren};
use crate::text::Text;

fn parse_raw_node<'a>(
    cursor: &mut MrmlCursor<'a>,
    tag: StrSpan<'a>,
    qualified_name: String,
) -> Result<Node<MjRawChild>, Error> {
    let attributes = parse_attributes_map(cursor)?;
    let ending = cursor.assert_element_end()?;
    if ending.empty || is_void_element(tag.as_str()) {
        return Ok(Node {
            tag: qualified_name,
            attributes,
            children: Vec::new(),
        });
    }

    let children = parse_raw_children(cursor)?;
    cursor.assert_element_close()?;

    Ok(Node {
        tag: qualified_name,
        attributes,
        children,
    })
}

fn parse_raw_children(cursor: &mut MrmlCursor<'_>) -> Result<Vec<MjRawChild>, Error> {
    let mut children = Vec::new();
    loop {
        let token = cursor.assert_next()?;
        match token {
            MrmlToken::Comment(inner) => {
                children.push(MjRawChild::Comment(Comment::from(inner.text.as_str())));
            }
            MrmlToken::ElementStart(elt) => {
                let qualified_name = elt.qualified_name();
                children.push(MjRawChild::Node(parse_raw_node(
                    cursor,
                    elt.local,
                    qualified_name,
                )?));
            }
            MrmlToken::Text(inner) => {
                children.push(MjRawChild::Text(Text::from(inner.text.as_str())));
            }
            MrmlToken::ElementClose(close) => {
                cursor.rewind(MrmlToken::ElementClose(close));
                return Ok(children);
            }
            MrmlToken::ConditionalCommentStart(start) => {
                children.push(MjRawChild::ConditionalComment(ConditionalComment::from(
                    start.span.as_str(),
                )));
            }
            MrmlToken::ConditionalCommentEnd(end) => {
                children.push(MjRawChild::ConditionalComment(ConditionalComment::from(
                    end.span.as_str(),
                )));
            }
            other => {
                return Err(Error::UnexpectedToken {
                    origin: cursor.origin(),
                    position: other.span(),
                });
            }
        }
    }
}

impl ParseElement<Node<MjRawChild>> for MrmlParser<'_> {
    fn parse<'a>(
        &self,
        cursor: &mut MrmlCursor<'a>,
        tag: StrSpan<'a>,
    ) -> Result<Node<MjRawChild>, Error> {
        parse_raw_node(cursor, tag, tag.to_string())
    }
}

#[cfg(feature = "async")]
#[cfg_attr(target_arch = "wasm32", async_trait::async_trait(?Send))]
#[cfg_attr(not(target_arch = "wasm32"), async_trait::async_trait)]
impl crate::prelude::parser::AsyncParseElement<Node<MjRawChild>> for AsyncMrmlParser {
    async fn async_parse<'a>(
        &self,
        cursor: &mut MrmlCursor<'a>,
        tag: StrSpan<'a>,
    ) -> Result<Node<MjRawChild>, Error> {
        parse_raw_node(cursor, tag, tag.to_string())
    }
}

impl ParseChildren<Vec<MjRawChild>> for MrmlParser<'_> {
    fn parse_children(&self, cursor: &mut MrmlCursor<'_>) -> Result<Vec<MjRawChild>, Error> {
        parse_raw_children(cursor)
    }
}

#[cfg(feature = "async")]
#[cfg_attr(target_arch = "wasm32", async_trait::async_trait(?Send))]
#[cfg_attr(not(target_arch = "wasm32"), async_trait::async_trait)]
impl AsyncParseChildren<Vec<MjRawChild>> for AsyncMrmlParser {
    async fn async_parse_children<'a>(
        &self,
        cursor: &mut MrmlCursor<'a>,
    ) -> Result<Vec<MjRawChild>, Error> {
        parse_raw_children(cursor)
    }
}

#[cfg(test)]
mod tests {
    use crate::mj_raw::MjRaw;

    crate::should_parse!(
        should_parse_start_conditional_comment_child,
        MjRaw,
        "<mj-raw><!--[if mso]></mj-raw>"
    );

    crate::should_parse!(
        should_parse_end_conditional_comment_child,
        MjRaw,
        "<mj-raw><![endif]--></mj-raw>"
    );

    crate::should_parse!(
        should_parse_conditional_comment_children,
        MjRaw,
        "<mj-raw><!--[if mso]>--><!--[if mso]><!--<![endif]--></mj-raw>"
    );

    crate::should_not_parse!(
        should_not_parse_malformed_conditional_comment_child,
        MjRaw,
        "<mj-raw><!- -[if mso]>--></mj-raw>"
    );
}