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use token::Token;
use error::{Result, Error, Source};
use logger::Logger;
use std::mem;
use std::fs::File;
use std::path::Path;
use std::convert::AsRef;
use std::io::Read;
use std::collections::HashMap;
use cmark::{Parser as CMParser, Event, Tag, Options, OPTION_ENABLE_FOOTNOTES, OPTION_ENABLE_TABLES};
pub struct Parser {
footnotes: HashMap<String, Vec<Token>>,
source: Source,
}
impl Parser {
pub fn new() -> Parser {
Parser {
footnotes: HashMap::new(),
source: Source::empty(),
}
}
pub fn set_source_file(&mut self, s: &str) {
self.source = Source::new(s);
}
pub fn parse_file<P: AsRef<Path>>(&mut self, filename: P) -> Result<Vec<Token>> {
let path: &Path = filename.as_ref();
let mut f = try!(File::open(path).map_err(|_| {
Error::file_not_found(&self.source,
lformat!("markdown file"),
format!("{}", path.display()))
}));
let mut s = String::new();
try!(f.read_to_string(&mut s).map_err(|_| {
Error::parser(&self.source,
lformat!("file {file} contains invalid UTF-8, could not parse it",
file = path.display()))
}));
self.parse(&s)
}
pub fn parse(&mut self, s: &str) -> Result<Vec<Token>> {
let mut opts = Options::empty();
opts.insert(OPTION_ENABLE_TABLES);
opts.insert(OPTION_ENABLE_FOOTNOTES);
let mut p = CMParser::new_ext(s, opts);
let mut res = vec![];
try!(self.parse_events(&mut p, &mut res, None));
try!(self.parse_footnotes(&mut res));
collapse(&mut res);
find_standalone(&mut res);
Ok(res)
}
pub fn parse_inline(&mut self, s: &str) -> Result<Vec<Token>> {
let mut tokens = try!(self.parse(s));
if tokens.len() == 1 {
let res = match tokens[0] {
Token::Paragraph(ref mut v) => Some(mem::replace(v, vec![])),
_ => None,
};
match res {
Some(tokens) => Ok(tokens),
_ => Ok(tokens),
}
} else {
Ok(tokens)
}
}
fn parse_footnotes(&mut self, v: &mut Vec<Token>) -> Result<()> {
for token in v {
match *token {
Token::Footnote(ref mut content) => {
let reference = if let Token::Str(ref text) = content[0] {
text.clone()
} else {
panic!("Reference is not a vector of a single Token::Str");
};
if let Some(in_vec) = self.footnotes.get(&reference) {
*content = in_vec.clone();
} else {
return Err(Error::parser(&self.source,
lformat!("footnote reference {reference} does \
not have a matching definition",
reference = &reference)));
}
}
Token::Paragraph(ref mut vec) |
Token::Header(_, ref mut vec) |
Token::Emphasis(ref mut vec) |
Token::Strong(ref mut vec) |
Token::Code(ref mut vec) |
Token::BlockQuote(ref mut vec) |
Token::CodeBlock(_, ref mut vec) |
Token::List(ref mut vec) |
Token::OrderedList(_, ref mut vec) |
Token::Item(ref mut vec) |
Token::Table(_, ref mut vec) |
Token::TableHead(ref mut vec) |
Token::TableRow(ref mut vec) |
Token::TableCell(ref mut vec) |
Token::Link(_, _, ref mut vec) |
Token::Image(_, _, ref mut vec) => try!(self.parse_footnotes(vec)),
_ => (),
}
}
Ok(())
}
fn parse_events<'a>(&mut self,
p: &mut CMParser<'a>,
v: &mut Vec<Token>,
current_tag: Option<&Tag>)
-> Result<()> {
while let Some(event) = p.next() {
match event {
Event::Html(text) |
Event::InlineHtml(text) |
Event::Text(text) => {
v.push(Token::Str(text.into_owned()));
}
Event::Start(tag) => try!(self.parse_tag(p, v, tag)),
Event::End(tag) => {
debug_assert!(format!("{:?}", Some(&tag)) == format!("{:?}", current_tag),
format!("Error: opening and closing tags mismatch!\n{:?} ≠ \
{:?}",
tag,
current_tag));
break;
}
Event::SoftBreak => v.push(Token::SoftBreak),
Event::HardBreak => v.push(Token::HardBreak),
Event::FootnoteReference(text) => {
v.push(Token::Footnote(vec![Token::Str(text.into_owned())]))
}
}
}
Ok(())
}
fn parse_tag<'a>(&mut self,
p: &mut CMParser<'a>,
v: &mut Vec<Token>,
tag: Tag<'a>)
-> Result<()> {
let mut res = vec![];
try!(self.parse_events(p, &mut res, Some(&tag)));
let token = match tag {
Tag::Paragraph => Token::Paragraph(res),
Tag::Emphasis => Token::Emphasis(res),
Tag::Strong => Token::Strong(res),
Tag::Code => Token::Code(res),
Tag::Header(x) => Token::Header(x, res),
Tag::Link(url, title) => Token::Link(url.into_owned(), title.into_owned(), res),
Tag::Image(url, title) => Token::Image(url.into_owned(), title.into_owned(), res),
Tag::Rule => Token::Rule,
Tag::List(opt) => {
if let Some(n) = opt {
Token::OrderedList(n, res)
} else {
Token::List(res)
}
}
Tag::Item => Token::Item(res),
Tag::BlockQuote => Token::BlockQuote(res),
Tag::CodeBlock(language) => Token::CodeBlock(language.into_owned(), res),
Tag::Table(n) => Token::Table(n, res),
Tag::TableHead => Token::TableHead(res),
Tag::TableRow => Token::TableRow(res),
Tag::TableCell => Token::TableCell(res),
Tag::FootnoteDefinition(reference) => {
if self.footnotes.contains_key(reference.as_ref()) {
Logger::display_warning(lformat!("in {file}, found footnote definition for \
note '{reference}' but previous \
definition already exist, overriding it",
file = self.source,
reference = reference));
}
self.footnotes.insert(reference.into_owned(), res);
Token::SoftBreak
}
};
v.push(token);
Ok(())
}
}
fn collapse(ast: &mut Vec<Token>) {
if ast.len() < 2 {
return;
}
let mut i = 0;
while i < ast.len() {
if ast[i].is_str() {
if i < ast.len() - 1 {
if ast[i + 1].is_str() {
let token = ast.remove(i + 1);
if let (&mut Token::Str(ref mut dest), Token::Str(ref source)) = (&mut ast[i],
token) {
dest.push_str(source);
continue;
} else {
unreachable!();
}
} else if ast[i + 1] == Token::SoftBreak {
ast.remove(i + 1);
if let &mut Token::Str(ref mut dest) = &mut ast[i] {
dest.push(' ');
continue;
} else {
unreachable!();
}
}
}
}
if let Some(ref mut inner) = ast[i].inner_mut() {
collapse(inner);
}
i += 1;
}
}
fn find_standalone(ast: &mut Vec<Token>) {
for token in ast {
let res = if let &mut Token::Paragraph(ref mut inner) = token {
if inner.len() == 1 {
if inner[0].is_image() {
if let Token::Image(source, title, inner) = mem::replace(&mut inner[0],
Token::Rule) {
Token::StandaloneImage(source, title, inner)
} else {
unreachable!();
}
} else {
continue;
}
} else {
continue;
}
} else {
continue;
};
*token = res;
}
}