sita 0.1.0

Sita: static site generator (SSG) for Markdown and HTML
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//! Matter parser using Markdown comment code front matter.

use std::any::Any;
use once_cell::sync::Lazy;
use regex::Regex;
use crate::errors::*;
use crate::types::*;
use crate::matter::matter_parser_trait::MatterParserTrait;
use crate::state::state_with_map::StateWithMap;

#[derive(Debug)]
pub struct MatterParserWithMarkdownComments {
}

impl MatterParserTrait<StateWithMap> for MatterParserWithMarkdownComments {

    fn as_any(&self) -> &dyn Any {
        self
    }

    /// Example:
    /// 
    /// ```
    /// # use ::indoc::indoc;
    /// let mix_text = indoc!{r#"
    ///     [//]: # (alpha: bravo)
    ///     [//]: # (charlie: delta)
    ///     echo
    ///     foxtrot
    /// "#};
    /// let content_text, matter_text = parse_mix_text_to_content_text_and_matter_text(mix_text).unwrap();
    /// assert_eq!(content_text, indoc!{r#"
    ///     echo
    ///     foxtrot
    /// "#};
    /// assert_eq!(matter_text, indoc!{r#"
    ///     [//]: # (alpha: bravo)
    ///     [//]: # (charlie: delta)
    /// "#};
    /// ```
    #[allow(dead_code)]
    fn parse_mix_text_to_content_text_and_matter_text(&self, mix_text: &str) -> Result<(String, String)> {
        trace!("MatterParserWithMarkdownComments::parse_mix_text_to_content_text_and_matter_text");
        let captures = REGEX.captures(mix_text)
        .chain_err(|| "captures")?;
        Ok((
            String::from(captures.name("content").unwrap().as_str()),
            String::from(captures.name("matter").unwrap().as_str()),
        ))
    }

    /// Example:
    /// 
    /// ```
    /// # use ::indoc::indoc;
    /// let mix_text = indoc!{r#"
    ///     [//]: # (alpha: bravo)
    ///     [//]: # (charlie: delta)
    ///     echo
    ///     foxtrot
    /// "#};
    /// let state = parse_matter_text_to_state(mix_text).unwrap();
    /// assert_eq!(state.get("alpha"), String::from("bravo"));
    /// assert_eq!(state.get("charlie"), String::from("delta"));
    /// ```
    #[allow(dead_code)]
    fn parse_matter_text_to_state(&self, matter_text: &str) -> Result<StateWithMap> {
        trace!("MatterParserWithMarkdownComments::parse_matter_text_to_state");
        let mut state: StateWithMap = Map::new();
        for line in matter_text.split("\n") {
            if let Some(captures) = (*PARSE_LINE_TO_KEY_VALUE_REGEX).captures(line) {
                if let Some(key) = captures.name("key") {
                    if let Some(value) = captures.name("value") {
                        state.insert(String::from(key.as_str()), String::from(value.as_str()));
                    }
                }
            }
        }
        Ok(state)
    }

}

pub static REGEX: Lazy<Regex> = Lazy::new(|| {
    Regex::new(r"(?m)(?s)\A(\s*\n)*(?P<matter>(\s*\[//\]: # .*?\)\s*\n)+)(\s*\n)*(?P<content>.*)\z").unwrap()
});

pub static PARSE_LINE_TO_KEY_VALUE_REGEX: Lazy<Regex> = Lazy::new(|| {
    Regex::new(r"\A\s*\[//\]: # \((?P<key>\w+?):\s*(?P<value>.*?)\)\s*\z").unwrap()
});

#[cfg(test)]
mod tests {
    use super::*;
    use ::indoc::indoc;

    type MatterParserX = MatterParserWithMarkdownComments;

    const MIX_TEXT: &str = indoc!{r#"
        [//]: # (alpha: bravo)
        [//]: # (charlie: delta)
        echo
        foxtrot
    "#};

    const CONTENT_TEXT: &str = indoc!{r#"
        echo
        foxtrot
    "#};

    const MATTER_TEXT: &str = indoc!{r#"
        [//]: # (alpha: bravo)
        [//]: # (charlie: delta)
    "#};

    fn expect_state() -> StateWithMap {
        map!(
            String::from("alpha") => String::from("bravo"),
            String::from("charlie") => String::from("delta")
        )
    }

    #[test]
    fn test_parse_mix_text_to_content_text_and_matter_text_x_present() {
        let result = MatterParserX{}.parse_mix_text_to_content_text_and_matter_text(MIX_TEXT);
        assert!(result.is_ok());
        let (content_text, matter_text) = result.unwrap();
        assert_eq!(content_text, CONTENT_TEXT);
        assert_eq!(matter_text, MATTER_TEXT);
    }

    #[test]
    fn test_parse_mix_text_to_content_text_and_matter_text_x_absent() {
        let result = MatterParserX{}.parse_mix_text_to_content_text_and_matter_text(CONTENT_TEXT);
        assert!(result.is_err());
    }

    #[test]
    fn test_parse_matter_text_to_state() {
        let result = MatterParserX{}.parse_matter_text_to_state(MATTER_TEXT);
        assert!(result.is_ok());
        let state = result.unwrap();
        assert_eq!(state, expect_state());
    }

}