/* rustdoc: rust -> markdown translator
 * Copyright 2011 Google Inc.
 */

// Some utility interfaces
import doc::item;
import doc::util;

#[doc = "A single operation on the document model"]
type pass = {
    name: str,
    f: fn~(srv: astsrv::srv, doc: doc::cratedoc) -> doc::cratedoc
};

fn run_passes(
    srv: astsrv::srv,
    doc: doc::cratedoc,
    passes: [pass]
) -> doc::cratedoc {

    #[doc(
        brief =
        "Run a series of passes over the document",
        args(
            srv =
            "The AST service to provide to the passes",
            doc =
            "The document to transform",
            passes =
            "The list of passes used to transform the document"
        ),
        return =
        "The transformed document that results from folding the \
         original through each pass"
    )];

    let passno = 0;
    vec::foldl(doc, passes) {|doc, pass|
        log(debug, #fmt("pass #%d", passno));
        passno += 1;
        log(debug, doc);
        time(pass.name) {||
            pass.f(srv, doc)
        }
    }
}

#[test]
fn test_run_passes() {
    fn pass1(
        _srv: astsrv::srv,
        doc: doc::cratedoc
    ) -> doc::cratedoc {
        {
            topmod: {
                item: {
                    name: doc.topmod.name() + "two"
                    with doc.topmod.item
                },
                items: [],
                index: none
            }
        }
    }
    fn pass2(
        _srv: astsrv::srv,
        doc: doc::cratedoc
    ) -> doc::cratedoc {
        {
            topmod: {
                item: {
                    name: doc.topmod.name() + "three"
                    with doc.topmod.item
                },
                items: [],
                index: none
            }
        }
    }
    let source = "";
    astsrv::from_str(source) {|srv|
        let passes = [
            {
                name: "",
                f: pass1
            },
            {
                name: "",
                f: pass2
            }
        ];
        let doc = extract::from_srv(srv, "one");
        let doc = run_passes(srv, doc, passes);
        assert doc.topmod.name() == "onetwothree";
    }
}

fn main(args: [str]) {

    if vec::contains(args, "-h") {
        config::usage();
        ret;
    }

    let config = alt config::parse_config(args) {
      result::ok(config) { config }
      result::err(err) {
        std::io::println(#fmt("error: %s", err));
        ret;
      }
    };

    run(config);
}

fn time<T>(what: str, f: fn() -> T) -> T {
    let start = std::time::precise_time_s();
    let rv = f();
    let end = std::time::precise_time_s();
    #info("time: %3.3f s    %s", end - start, what);
    ret rv;
}

#[doc = "Runs rustdoc over the given file"]
fn run(config: config::config) {

    let source_file = config.input_crate;
    astsrv::from_file(source_file) {|srv|
        time("wait_ast") {||
            astsrv::exec(srv) {|_ctxt| () }
        };
        let doc = time("extract") {||
            let default_name = source_file;
            extract::from_srv(srv, default_name)
        };
        run_passes(srv, doc, [
            reexport_pass::mk_pass(),
            prune_unexported_pass::mk_pass(),
            tystr_pass::mk_pass(),
            path_pass::mk_pass(),
            attr_pass::mk_pass(),
            prune_undoc_details_pass::mk_pass(),
            // FIXME: This pass should be optional
            // prune_undoc_items_pass::mk_pass(),
            desc_to_brief_pass::mk_pass(),
            trim_pass::mk_pass(),
            unindent_pass::mk_pass(),
            sort_item_name_pass::mk_pass(),
            sort_item_type_pass::mk_pass(),
            markdown_index_pass::mk_pass(),
            markdown_pass::mk_pass(config)
        ]);
    }
}