pub fn parse_summary(input: &mut Read, src: &Path) -> Result<Book, Vec<String>> {
    fn collapse(stack: &mut Vec<BookItem>,
                top_items: &mut Vec<BookItem>,
                to_level: usize) {
        loop {
            if stack.len() < to_level { return }
            if stack.len() == 1 {
                top_items.push(stack.pop().unwrap());
                return;
            }

            let tip = stack.pop().unwrap();
            let last = stack.len() - 1;
            stack[last].children.push(tip);
        }
    }

    let mut top_items = vec![];
    let mut stack = vec![];
    let mut errors = vec![];

    // always include the introduction
    top_items.push(BookItem {
        title: "Introduction".to_string(),
        path: PathBuf::from("README.md"),
        path_to_root: PathBuf::from(""),
        children: vec![],
    });

    for line_result in BufReader::new(input).lines() {
        let line = match line_result {
            Ok(line) => line,
            Err(err) => {
                errors.push(err.to_string());
                return Err(errors);
            }
        };

        let star_idx = match line.find("*") { Some(i) => i, None => continue };

        let start_bracket = star_idx + line[star_idx..].find("[").unwrap();
        let end_bracket = start_bracket + line[start_bracket..].find("](").unwrap();
        let start_paren = end_bracket + 1;
        let end_paren = start_paren + line[start_paren..].find(")").unwrap();

        let given_path = &line[start_paren + 1 .. end_paren];
        let title = line[start_bracket + 1..end_bracket].to_string();
        let indent = &line[..star_idx];

        let path_from_root = match src.join(given_path).strip_prefix(src) {
            Ok(p) => p.to_path_buf(),
            Err(..) => {
                errors.push(format!("paths in SUMMARY.md must be relative, \
                                     but path '{}' for section '{}' is not.",
                                     given_path, title));
                PathBuf::new()
            }
        };
        let path_to_root = PathBuf::from(&iter::repeat("../")
                                         .take(path_from_root.components().count() - 1)
                                         .collect::<String>());
        let item = BookItem {
            title: title,
            path: path_from_root,
            path_to_root: path_to_root,
            children: vec![],
        };
        let level = indent.chars().map(|c| -> usize {
            match c {
                ' ' => 1,
                '\t' => 4,
                _ => unreachable!()
            }
        }).sum::<usize>() / 4 + 1;

        if level > stack.len() + 1 {
            errors.push(format!("section '{}' is indented too deeply; \
                                 found {}, expected {} or less",
                                item.title, level, stack.len() + 1));
        } else if level <= stack.len() {
            collapse(&mut stack, &mut top_items, level);
        }
        stack.push(item)
    }

    if errors.is_empty() {
        collapse(&mut stack, &mut top_items, 1);
        Ok(Book { chapters: top_items })
    } else {
        Err(errors)
    }
}
/// Construct a book by parsing a summary (markdown table of contents).
Construct a book by parsing a summary (markdown table of contents).
Construct a book by parsing a summary ( markdown table of contents ) .
pub fn parse_summary(input: &mut Read, src: &Path) -> Result<Book, Vec<String>> {
    fn collapse(stack: &mut Vec<BookItem>,
                top_items: &mut Vec<BookItem>,
                to_level: usize) {
        loop {
            if stack.len() < to_level { return }
            if stack.len() == 1 {
                top_items.push(stack.pop().unwrap());
                return;
            }
            let tip = stack.pop().unwrap();
            let last = stack.len() - 1;
            stack[last].children.push(tip);
        }
    }
    let mut top_items = vec![];
    let mut stack = vec![];
    let mut errors = vec![];
    // always include the introduction
    top_items.push(BookItem {
        title: "Introduction".to_string(),
        path: PathBuf::from("README.md"),
        path_to_root: PathBuf::from(""),
        children: vec![],
    });
    for line_result in BufReader::new(input).lines() {
        let line = match line_result {
            Ok(line) => line,
            Err(err) => {
                errors.push(err.to_string());
                return Err(errors);
            }
        };
        let star_idx = match line.find("*") { Some(i) => i, None => continue };
        let start_bracket = star_idx + line[star_idx..].find("[").unwrap();
        let end_bracket = start_bracket + line[start_bracket..].find("](").unwrap();
        let start_paren = end_bracket + 1;
        let end_paren = start_paren + line[start_paren..].find(")").unwrap();
        let given_path = &line[start_paren + 1 .. end_paren];
        let title = line[start_bracket + 1..end_bracket].to_string();
        let indent = &line[..star_idx];
        let path_from_root = match src.join(given_path).strip_prefix(src) {
            Ok(p) => p.to_path_buf(),
            Err(..) => {
                errors.push(format!("paths in SUMMARY.md must be relative, \
                                     but path '{}' for section '{}' is not.",
                                     given_path, title));
                PathBuf::new()
            }
        };
        let path_to_root = PathBuf::from(&iter::repeat("../")
                                         .take(path_from_root.components().count() - 1)
                                         .collect::<String>());
        let item = BookItem {
            title: title,
            path: path_from_root,
            path_to_root: path_to_root,
            children: vec![],
        };
        let level = indent.chars().map(|c| -> usize {
            match c {
                ' ' => 1,
                '\t' => 4,
                _ => unreachable!()
            }
        }).sum::<usize>() / 4 + 1;
        if level > stack.len() + 1 {
            errors.push(format!("section '{}' is indented too deeply; \
                                 found {}, expected {} or less",
                                item.title, level, stack.len() + 1));
        } else if level <= stack.len() {
            collapse(&mut stack, &mut top_items, level);
        }
        stack.push(item)
    }
    if errors.is_empty() {
        collapse(&mut stack, &mut top_items, 1);
        Ok(Book { chapters: top_items })
    } else {
        Err(errors)
    }
}
pub fn parse_summary ( input : & mut Read , src : & Path ) -> Result < Book , Vec < String > > { fn collapse ( stack : & mut Vec < BookItem > , top_items : & mut Vec < BookItem > , to_level : usize ) { loop { if stack . len ( ) < to_level { return } if stack . len ( ) == 1 { top_items . push ( stack . pop ( ) . unwrap ( ) ) ; return ; } let tip = stack . pop ( ) . unwrap ( ) ; let last = stack . len ( ) - 1 ; stack [ last ] . children . push ( tip ) ; } } let mut top_items = vec ! [ ] ; let mut stack = vec ! [ ] ; let mut errors = vec ! [ ] ; // always include the introduction top_items . push ( BookItem { title : " " . to_string ( ) , path : PathBuf :: from ( " " ) , path_to_root : PathBuf :: from ( " " ) , children : vec ! [ ] , } ) ; for line_result in BufReader :: new ( input ) . lines ( ) { let line = match line_result { Ok ( line ) => line , Err ( err ) => { errors . push ( err . to_string ( ) ) ; return Err ( errors ) ; } } ; let star_idx = match line . find ( " " ) { Some ( i ) => i , None => continue } ; let start_bracket = star_idx + line [ star_idx .. ] . find ( " " ) . unwrap ( ) ; let end_bracket = start_bracket + line [ start_bracket .. ] . find ( " " ) . unwrap ( ) ; let start_paren = end_bracket + 1 ; let end_paren = start_paren + line [ start_paren .. ] . find ( " " ) . unwrap ( ) ; let given_path = & line [ start_paren + 1 .. end_paren ] ; let title = line [ start_bracket + 1 .. end_bracket ] . to_string ( ) ; let indent = & line [ .. star_idx ] ; let path_from_root = match src . join ( given_path ) . strip_prefix ( src ) { Ok ( p ) => p . to_path_buf ( ) , Err ( .. ) => { errors . push ( format ! ( " \
 " given_path title ) ) ; PathBuf :: new ( ) } } ; let path_to_root = PathBuf :: from ( & iter :: repeat ( " " ) . take ( path_from_root . components ( ) . count ( ) - 1 ) . collect :: < String > ( ) ) ; let item = BookItem { title : title , path : path_from_root , path_to_root : path_to_root , children : vec ! [ ] , } ; let level = indent . chars ( ) . map ( | c | -> usize { match c { ' ' => 1 , '\t' => 4 , _ => unreachable ! ( ) } } ) . sum :: < usize > ( ) / 4 + 1 ; if level > stack . len ( ) + 1 { errors . push ( format ! ( " \
 " item title level stack len ( ) 1 ) ) ; } else if level <= stack . len ( ) { collapse ( & mut stack , & mut top_items , level ) ; } stack . push ( item ) } if errors . is_empty ( ) { collapse ( & mut stack , & mut top_items , 1 ) ; Ok ( Book { chapters : top_items } ) } else { Err ( errors ) } }
Construct a book by parsing a summary (markdown table of contents).
Construct a book by parsing a summary ( markdown table of contents ) .
input
&mut Read
src
&Path
input
&mut Read
src
&Path