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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#[allow(cstack)]; // each rendering task runs on a fixed stack segment.
use std::fmt;
use std::libc;
use std::rt::io;
use std::vec;
pub struct Markdown<'self>(&'self str);
static OUTPUT_UNIT: libc::size_t = 64;
static MKDEXT_NO_INTRA_EMPHASIS: libc::c_uint = 1 << 0;
static MKDEXT_TABLES: libc::c_uint = 1 << 1;
static MKDEXT_FENCED_CODE: libc::c_uint = 1 << 2;
static MKDEXT_AUTOLINK: libc::c_uint = 1 << 3;
static MKDEXT_STRIKETHROUGH: libc::c_uint = 1 << 4;
static MKDEXT_SPACE_HEADERS: libc::c_uint = 1 << 6;
static MKDEXT_SUPERSCRIPT: libc::c_uint = 1 << 7;
static MKDEXT_LAX_SPACING: libc::c_uint = 1 << 8;
type sd_markdown = libc::c_void; // this is opaque to us
// this is a large struct of callbacks we don't use
type sd_callbacks = [libc::size_t, ..26];
struct html_toc_data {
header_count: libc::c_int,
current_level: libc::c_int,
level_offset: libc::c_int,
}
struct html_renderopt {
toc_data: html_toc_data,
flags: libc::c_uint,
link_attributes: Option<extern "C" fn(*buf, *buf, *libc::c_void)>,
}
struct buf {
data: *u8,
size: libc::size_t,
asize: libc::size_t,
unit: libc::size_t,
}
// sundown FFI
extern {
fn sdhtml_renderer(callbacks: *sd_callbacks,
options_ptr: *html_renderopt,
render_flags: libc::c_uint);
fn sd_markdown_new(extensions: libc::c_uint,
max_nesting: libc::size_t,
callbacks: *sd_callbacks,
opaque: *libc::c_void) -> *sd_markdown;
fn sd_markdown_render(ob: *buf,
document: *u8,
doc_size: libc::size_t,
md: *sd_markdown);
fn sd_markdown_free(md: *sd_markdown);
fn bufnew(unit: libc::size_t) -> *buf;
fn bufrelease(b: *buf);
}
fn render(w: &mut io::Writer, s: &str) {
// This code is all lifted from examples/sundown.c in the sundown repo
unsafe {
let ob = bufnew(OUTPUT_UNIT);
let extensions = MKDEXT_NO_INTRA_EMPHASIS | MKDEXT_TABLES |
MKDEXT_FENCED_CODE | MKDEXT_AUTOLINK |
MKDEXT_STRIKETHROUGH;
let options = html_renderopt {
toc_data: html_toc_data {
header_count: 0,
current_level: 0,
level_offset: 0,
},
flags: 0,
link_attributes: None,
};
let callbacks: sd_callbacks = [0, ..26];
sdhtml_renderer(&callbacks, &options, 0);
let markdown = sd_markdown_new(extensions, 16, &callbacks,
&options as *html_renderopt as *libc::c_void);
do s.as_imm_buf |data, len| {
sd_markdown_render(ob, data, len as libc::size_t, markdown);
}
sd_markdown_free(markdown);
do vec::raw::buf_as_slice((*ob).data, (*ob).size as uint) |buf| {
w.write(buf);
}
bufrelease(ob);
}
}
impl<'self> fmt::Default for Markdown<'self> {
fn fmt(md: &Markdown<'self>, fmt: &mut fmt::Formatter) {
// This is actually common enough to special-case
if md.len() == 0 { return; }
render(fmt.buf, md.as_slice());
}
}
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