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#[doc(
brief = "Provides all access to AST-related, non-sendable info",
desc =
"Rustdoc is intended to be parallel, and the rustc AST is filled \
with shared boxes. The AST service attempts to provide a single \
place to query AST-related information, shielding the rest of \
Rustdoc from its non-sendableness."
)];
use std::map::HashMap;
use rustc::driver::session;
use session::{basic_options, options};
use session::session;
use rustc::driver::driver;
use syntax::diagnostic;
use syntax::diagnostic::handler;
use syntax::ast;
use syntax::codemap;
use syntax::ast_map;
use rustc::back::link;
use rustc::metadata::filesearch;
use rustc::front;
export ctxt;
export ctxt_handler;
export srv;
export from_str;
export from_file;
export exec;
type ctxt = {
ast: @ast::crate,
ast_map: ast_map::map
};
type srv_owner<T> = fn(srv: srv) -> T;
type ctxt_handler<T> = fn~(ctxt: ctxt) -> T;
type parser = fn~(session, ~str) -> @ast::crate;
enum msg {
handle_request(fn~(ctxt)),
exit
}
enum srv = {
ch: comm::Chan<msg>
};
fn from_str<T>(source: ~str, owner: srv_owner<T>) -> T {
run(owner, source, parse::from_str_sess)
}
fn from_file<T>(file: ~str, owner: srv_owner<T>) -> T {
run(owner, file, |sess, f| parse::from_file_sess(sess, &Path(f)))
}
fn run<T>(owner: srv_owner<T>, source: ~str, +parse: parser) -> T {
let srv_ = srv({
ch: do task::spawn_listener |po| {
act(po, source, parse);
}
});
let res = owner(srv_);
comm::send(srv_.ch, exit);
return res;
}
fn act(po: comm::Port<msg>, source: ~str, parse: parser) {
let sess = build_session();
let ctxt = build_ctxt(
sess,
parse(sess, source)
);
let mut keep_going = true;
while keep_going {
match comm::recv(po) {
handle_request(f) => {
f(ctxt);
}
exit => {
keep_going = false;
}
}
}
}
fn exec<T:Send>(
srv: srv,
+f: fn~(ctxt: ctxt) -> T
) -> T {
let po = comm::Port();
let ch = comm::Chan(po);
let msg = handle_request(fn~(move f, ctxt: ctxt) {
comm::send(ch, f(ctxt))
});
comm::send(srv.ch, msg);
comm::recv(po)
}
fn build_ctxt(sess: session,
ast: @ast::crate) -> ctxt {
import rustc::front::config;
let ast = config::strip_unconfigured_items(ast);
let ast = syntax::ext::expand::expand_crate(sess.parse_sess,
sess.opts.cfg, ast);
let ast = front::test::modify_for_testing(sess, ast);
let ast_map = ast_map::map_crate(sess.diagnostic(), *ast);
{
ast: ast,
ast_map: ast_map,
}
}
fn build_session() -> session {
let sopts: @options = basic_options();
let codemap = codemap::new_codemap();
let error_handlers = build_error_handlers(codemap);
let {emitter, span_handler} = error_handlers;
let session = driver::build_session_(sopts, codemap, emitter,
span_handler);
session
}
type error_handlers = {
emitter: diagnostic::emitter,
span_handler: diagnostic::span_handler
};
// Build a custom error handler that will allow us to ignore non-fatal
// errors
fn build_error_handlers(
codemap: codemap::codemap
) -> error_handlers {
type diagnostic_handler = {
inner: diagnostic::handler,
};
impl diagnostic_handler: diagnostic::handler {
fn fatal(msg: ~str) -> ! { self.inner.fatal(msg) }
fn err(msg: ~str) { self.inner.err(msg) }
fn bump_err_count() {
self.inner.bump_err_count();
}
fn has_errors() -> bool { self.inner.has_errors() }
fn abort_if_errors() { self.inner.abort_if_errors() }
fn warn(msg: ~str) { self.inner.warn(msg) }
fn note(msg: ~str) { self.inner.note(msg) }
fn bug(msg: ~str) -> ! { self.inner.bug(msg) }
fn unimpl(msg: ~str) -> ! { self.inner.unimpl(msg) }
fn emit(cmsp: Option<(codemap::codemap, codemap::span)>,
msg: ~str, lvl: diagnostic::level) {
self.inner.emit(cmsp, msg, lvl)
}
}
let emitter = fn@(cmsp: Option<(codemap::codemap, codemap::span)>,
msg: ~str, lvl: diagnostic::level) {
diagnostic::emit(cmsp, msg, lvl);
};
let inner_handler = diagnostic::mk_handler(Some(emitter));
let handler = {
inner: inner_handler,
};
let span_handler = diagnostic::mk_span_handler(
handler as diagnostic::handler, codemap);
{
emitter: emitter,
span_handler: span_handler
}
}
#[test]
fn should_prune_unconfigured_items() {
let source = ~"#[cfg(shut_up_and_leave_me_alone)]fn a() { }";
do from_str(source) |srv| {
do exec(srv) |ctxt| {
assert vec::is_empty(ctxt.ast.node.module.items);
}
}
}
#[test]
fn srv_should_build_ast_map() {
let source = ~"fn a() { }";
do from_str(source) |srv| {
do exec(srv) |ctxt| {
assert ctxt.ast_map.size() != 0u
};
}
}
#[test]
fn should_ignore_external_import_paths_that_dont_exist() {
let source = ~"use forble; import forble::bippy;";
from_str(source, |_srv| { } )
}
#[test]
fn srv_should_return_request_result() {
let source = ~"fn a() { }";
do from_str(source) |srv| {
let result = exec(srv, |_ctxt| 1000 );
assert result == 1000;
}
}
|
