1 // Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Markdown formatting for rustdoc
13 //! This module implements markdown formatting through the hoedown C-library
14 //! (bundled into the rust runtime). This module self-contains the C bindings
15 //! and necessary legwork to render markdown, and exposes all of the
16 //! functionality through a unit-struct, `Markdown`, which has an implementation
17 //! of `fmt::Show`. Example usage:
20 //! use rustdoc::html::markdown::Markdown;
22 //! let s = "My *markdown* _text_";
23 //! let html = format!("{}", Markdown(s));
24 //! // ... something using html
28 #![allow(non_camel_case_types)]
31 use std::cell::{RefCell, Cell};
35 use std::collections::HashMap;
37 use html::toc::TocBuilder;
39 use html::escape::Escape;
42 /// A unit struct which has the `fmt::Show` trait implemented. When
43 /// formatted, this struct will emit the HTML corresponding to the rendered
44 /// version of the contained markdown string.
45 pub struct Markdown<'a>(pub &'a str);
46 /// A unit struct like `Markdown`, that renders the markdown with a
47 /// table of contents.
48 pub struct MarkdownWithToc<'a>(pub &'a str);
50 static DEF_OUNIT: libc::size_t = 64;
51 static HOEDOWN_EXT_NO_INTRA_EMPHASIS: libc::c_uint = 1 << 10;
52 static HOEDOWN_EXT_TABLES: libc::c_uint = 1 << 0;
53 static HOEDOWN_EXT_FENCED_CODE: libc::c_uint = 1 << 1;
54 static HOEDOWN_EXT_AUTOLINK: libc::c_uint = 1 << 3;
55 static HOEDOWN_EXT_STRIKETHROUGH: libc::c_uint = 1 << 4;
56 static HOEDOWN_EXT_SUPERSCRIPT: libc::c_uint = 1 << 8;
57 static HOEDOWN_EXT_FOOTNOTES: libc::c_uint = 1 << 2;
59 static HOEDOWN_EXTENSIONS: libc::c_uint =
60 HOEDOWN_EXT_NO_INTRA_EMPHASIS | HOEDOWN_EXT_TABLES |
61 HOEDOWN_EXT_FENCED_CODE | HOEDOWN_EXT_AUTOLINK |
62 HOEDOWN_EXT_STRIKETHROUGH | HOEDOWN_EXT_SUPERSCRIPT |
63 HOEDOWN_EXT_FOOTNOTES;
65 type hoedown_document = libc::c_void; // this is opaque to us
67 struct hoedown_renderer {
68 opaque: *mut hoedown_html_renderer_state,
69 blockcode: Option<extern "C" fn(*mut hoedown_buffer, *hoedown_buffer,
70 *hoedown_buffer, *mut libc::c_void)>,
71 blockquote: Option<extern "C" fn(*mut hoedown_buffer, *hoedown_buffer,
73 blockhtml: Option<extern "C" fn(*mut hoedown_buffer, *hoedown_buffer,
75 header: Option<extern "C" fn(*mut hoedown_buffer, *hoedown_buffer,
76 libc::c_int, *mut libc::c_void)>,
77 other: [libc::size_t, ..28],
80 struct hoedown_html_renderer_state {
81 opaque: *mut libc::c_void,
82 toc_data: html_toc_data,
84 link_attributes: Option<extern "C" fn(*mut hoedown_buffer, *hoedown_buffer,
88 struct html_toc_data {
89 header_count: libc::c_int,
90 current_level: libc::c_int,
91 level_offset: libc::c_int,
92 nesting_level: libc::c_int,
96 dfltblk: extern "C" fn(*mut hoedown_buffer, *hoedown_buffer,
97 *hoedown_buffer, *mut libc::c_void),
98 toc_builder: Option<TocBuilder>,
101 struct hoedown_buffer {
109 #[link(name = "hoedown", kind = "static")]
111 fn hoedown_html_renderer_new(render_flags: libc::c_uint,
112 nesting_level: libc::c_int)
113 -> *mut hoedown_renderer;
114 fn hoedown_html_renderer_free(renderer: *mut hoedown_renderer);
116 fn hoedown_document_new(rndr: *mut hoedown_renderer,
117 extensions: libc::c_uint,
118 max_nesting: libc::size_t) -> *mut hoedown_document;
119 fn hoedown_document_render(doc: *mut hoedown_document,
120 ob: *mut hoedown_buffer,
122 doc_size: libc::size_t);
123 fn hoedown_document_free(md: *mut hoedown_document);
125 fn hoedown_buffer_new(unit: libc::size_t) -> *mut hoedown_buffer;
126 fn hoedown_buffer_puts(b: *mut hoedown_buffer, c: *libc::c_char);
127 fn hoedown_buffer_free(b: *mut hoedown_buffer);
131 /// Returns Some(code) if `s` is a line that should be stripped from
132 /// documentation but used in example code. `code` is the portion of
133 /// `s` that should be used in tests. (None for lines that should be
135 fn stripped_filtered_line<'a>(s: &'a str) -> Option<&'a str> {
136 let trimmed = s.trim();
137 if trimmed.starts_with("# ") {
138 Some(trimmed.slice_from(2))
144 local_data_key!(used_header_map: RefCell<HashMap<String, uint>>)
145 local_data_key!(test_idx: Cell<uint>)
146 // None == render an example, but there's no crate name
147 local_data_key!(pub playground_krate: Option<String>)
149 pub fn render(w: &mut fmt::Formatter, s: &str, print_toc: bool) -> fmt::Result {
150 extern fn block(ob: *mut hoedown_buffer, text: *hoedown_buffer,
151 lang: *hoedown_buffer, opaque: *mut libc::c_void) {
153 if text.is_null() { return }
155 let opaque = opaque as *mut hoedown_html_renderer_state;
156 let my_opaque: &MyOpaque = &*((*opaque).opaque as *MyOpaque);
157 slice::raw::buf_as_slice((*text).data, (*text).size as uint, |text| {
158 let origtext = str::from_utf8(text).unwrap();
159 debug!("docblock: ==============\n{}\n=======", text);
160 let mut lines = origtext.lines().filter(|l| {
161 stripped_filtered_line(*l).is_none()
163 let text = lines.collect::<Vec<&str>>().connect("\n");
165 let buf = hoedown_buffer {
166 data: text.as_bytes().as_ptr(),
167 size: text.len() as libc::size_t,
168 asize: text.len() as libc::size_t,
171 let rendered = if lang.is_null() {
174 slice::raw::buf_as_slice((*lang).data,
175 (*lang).size as uint, |rlang| {
176 let rlang = str::from_utf8(rlang).unwrap();
177 let (_,_,_,notrust) = parse_lang_string(rlang);
179 (my_opaque.dfltblk)(ob, &buf, lang,
180 opaque as *mut libc::c_void);
189 let mut s = String::new();
190 let id = playground_krate.get().map(|krate| {
191 let idx = test_idx.get().unwrap();
195 let test = origtext.lines().map(|l| {
196 stripped_filtered_line(l).unwrap_or(l)
197 }).collect::<Vec<&str>>().connect("\n");
198 let krate = krate.as_ref().map(|s| s.as_slice());
199 let test = test::maketest(test.as_slice(), krate, false);
200 s.push_str(format!("<span id='rust-example-raw-{}' \
201 class='rusttest'>{}</span>",
202 i, Escape(test.as_slice())).as_slice());
203 format!("rust-example-rendered-{}", i)
205 let id = id.as_ref().map(|a| a.as_slice());
206 s.push_str(highlight::highlight(text.as_slice(), None, id)
208 let output = s.to_c_str();
209 output.with_ref(|r| {
210 hoedown_buffer_puts(ob, r)
217 extern fn header(ob: *mut hoedown_buffer, text: *hoedown_buffer,
218 level: libc::c_int, opaque: *mut libc::c_void) {
219 // hoedown does this, we may as well too
220 "\n".with_c_str(|p| unsafe { hoedown_buffer_puts(ob, p) });
222 // Extract the text provided
223 let s = if text.is_null() {
227 str::raw::from_buf_len((*text).data, (*text).size as uint)
231 // Transform the contents of the header into a hyphenated string
232 let id = (s.as_slice().words().map(|s| {
233 match s.to_ascii_opt() {
234 Some(s) => s.to_lower().into_str(),
235 None => s.to_string()
237 }).collect::<Vec<String>>().connect("-")).to_string();
239 // This is a terrible hack working around how hoedown gives us rendered
240 // html for text rather than the raw text.
241 let id = id.replace("<code>", "").replace("</code>", "").to_string();
243 let opaque = opaque as *mut hoedown_html_renderer_state;
244 let opaque = unsafe { &mut *((*opaque).opaque as *mut MyOpaque) };
246 // Make sure our hyphenated ID is unique for this page
247 let map = used_header_map.get().unwrap();
248 let id = match map.borrow_mut().find_mut(&id) {
250 Some(a) => { *a += 1; format!("{}-{}", id, *a - 1) }
252 map.borrow_mut().insert(id.clone(), 1);
254 let sec = match opaque.toc_builder {
255 Some(ref mut builder) => {
256 builder.push(level as u32, s.to_string(), id.clone())
262 let text = format!(r#"<h{lvl} id="{id}" class='section-header'><a
263 href="\#{id}">{sec}{}</a></h{lvl}>"#,
264 s, lvl = level, id = id,
265 sec = if sec.len() == 0 {
271 text.with_c_str(|p| unsafe { hoedown_buffer_puts(ob, p) });
275 let ob = hoedown_buffer_new(DEF_OUNIT);
276 let renderer = hoedown_html_renderer_new(0, 0);
277 let mut opaque = MyOpaque {
278 dfltblk: (*renderer).blockcode.unwrap(),
279 toc_builder: if print_toc {Some(TocBuilder::new())} else {None}
281 (*(*renderer).opaque).opaque = &mut opaque as *mut _ as *mut libc::c_void;
282 (*renderer).blockcode = Some(block);
283 (*renderer).header = Some(header);
285 let document = hoedown_document_new(renderer, HOEDOWN_EXTENSIONS, 16);
286 hoedown_document_render(document, ob, s.as_ptr(),
287 s.len() as libc::size_t);
288 hoedown_document_free(document);
290 hoedown_html_renderer_free(renderer);
292 let mut ret = match opaque.toc_builder {
293 Some(b) => write!(w, "<nav id=\"TOC\">{}</nav>", b.into_toc()),
298 ret = slice::raw::buf_as_slice((*ob).data, (*ob).size as uint, |buf| {
302 hoedown_buffer_free(ob);
307 pub fn find_testable_code(doc: &str, tests: &mut ::test::Collector) {
308 extern fn block(_ob: *mut hoedown_buffer, text: *hoedown_buffer,
309 lang: *hoedown_buffer, opaque: *mut libc::c_void) {
311 if text.is_null() { return }
312 let (should_fail, no_run, ignore, notrust) = if lang.is_null() {
313 (false, false, false, false)
315 slice::raw::buf_as_slice((*lang).data,
316 (*lang).size as uint, |lang| {
317 let s = str::from_utf8(lang).unwrap();
321 if notrust { return }
322 slice::raw::buf_as_slice((*text).data, (*text).size as uint, |text| {
323 let opaque = opaque as *mut hoedown_html_renderer_state;
324 let tests = &mut *((*opaque).opaque as *mut ::test::Collector);
325 let text = str::from_utf8(text).unwrap();
326 let mut lines = text.lines().map(|l| {
327 stripped_filtered_line(l).unwrap_or(l)
329 let text = lines.collect::<Vec<&str>>().connect("\n");
330 tests.add_test(text.to_string(), should_fail, no_run, ignore);
335 extern fn header(_ob: *mut hoedown_buffer, text: *hoedown_buffer,
336 level: libc::c_int, opaque: *mut libc::c_void) {
338 let opaque = opaque as *mut hoedown_html_renderer_state;
339 let tests = &mut *((*opaque).opaque as *mut ::test::Collector);
341 tests.register_header("", level as u32);
343 slice::raw::buf_as_slice((*text).data, (*text).size as uint, |text| {
344 let text = str::from_utf8(text).unwrap();
345 tests.register_header(text, level as u32);
352 let ob = hoedown_buffer_new(DEF_OUNIT);
353 let renderer = hoedown_html_renderer_new(0, 0);
354 (*renderer).blockcode = Some(block);
355 (*renderer).header = Some(header);
356 (*(*renderer).opaque).opaque = tests as *mut _ as *mut libc::c_void;
358 let document = hoedown_document_new(renderer, HOEDOWN_EXTENSIONS, 16);
359 hoedown_document_render(document, ob, doc.as_ptr(),
360 doc.len() as libc::size_t);
361 hoedown_document_free(document);
363 hoedown_html_renderer_free(renderer);
364 hoedown_buffer_free(ob);
368 fn parse_lang_string(string: &str) -> (bool,bool,bool,bool) {
369 let mut seen_rust_tags = false;
370 let mut seen_other_tags = false;
371 let mut should_fail = false;
372 let mut no_run = false;
373 let mut ignore = false;
374 let mut notrust = false;
376 let mut tokens = string.as_slice().split(|c: char|
377 !(c == '_' || c == '-' || c.is_alphanumeric())
380 for token in tokens {
383 "should_fail" => { should_fail = true; seen_rust_tags = true; },
384 "no_run" => { no_run = true; seen_rust_tags = true; },
385 "ignore" => { ignore = true; seen_rust_tags = true; },
386 "notrust" => { notrust = true; seen_rust_tags = true; },
387 "rust" => { notrust = false; seen_rust_tags = true; },
388 _ => { seen_other_tags = true }
392 let notrust = notrust || (seen_other_tags && !seen_rust_tags);
394 (should_fail, no_run, ignore, notrust)
397 /// By default this markdown renderer generates anchors for each header in the
398 /// rendered document. The anchor name is the contents of the header separated
399 /// by hyphens, and a task-local map is used to disambiguate among duplicate
400 /// headers (numbers are appended).
402 /// This method will reset the local table for these headers. This is typically
403 /// used at the beginning of rendering an entire HTML page to reset from the
404 /// previous state (if any).
405 pub fn reset_headers() {
406 used_header_map.replace(Some(RefCell::new(HashMap::new())));
407 test_idx.replace(Some(Cell::new(0)));
410 impl<'a> fmt::Show for Markdown<'a> {
411 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
412 let Markdown(md) = *self;
413 // This is actually common enough to special-case
414 if md.len() == 0 { return Ok(()) }
415 render(fmt, md.as_slice(), false)
419 impl<'a> fmt::Show for MarkdownWithToc<'a> {
420 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
421 let MarkdownWithToc(md) = *self;
422 render(fmt, md.as_slice(), true)
428 use super::parse_lang_string;
431 fn test_parse_lang_string() {
432 assert_eq!(parse_lang_string(""), (false,false,false,false))
433 assert_eq!(parse_lang_string("rust"), (false,false,false,false))
434 assert_eq!(parse_lang_string("sh"), (false,false,false,true))
435 assert_eq!(parse_lang_string("notrust"), (false,false,false,true))
436 assert_eq!(parse_lang_string("ignore"), (false,false,true,false))
437 assert_eq!(parse_lang_string("should_fail"), (true,false,false,false))
438 assert_eq!(parse_lang_string("no_run"), (false,true,false,false))
439 assert_eq!(parse_lang_string("{.no_run .example}"), (false,true,false,false))
440 assert_eq!(parse_lang_string("{.sh .should_fail}"), (true,false,false,false))
441 assert_eq!(parse_lang_string("{.example .rust}"), (false,false,false,false))