#[doc = "Generic pass for performing an operation on all descriptions"];

export mk_pass;

fn mk_pass(op: fn~(str) -> str) -> pass {
    fn~(srv: astsrv::srv, doc: doc::cratedoc) -> doc::cratedoc {
        run(srv, doc, op)
    }
}

type op = fn~(str) -> str;

fn run(
    _srv: astsrv::srv,
    doc: doc::cratedoc,
    op: op
) -> doc::cratedoc {
    let fold = fold::fold({
        fold_mod: fold_mod,
        fold_const: fold_const,
        fold_fn: fold_fn,
        fold_enum: fold_enum,
        fold_res: fold_res
        with *fold::default_seq_fold(op)
    });
    fold.fold_crate(fold, doc)
}

fn maybe_apply_op(op: op, s: option<str>) -> option<str> {
    option::map(s) {|s| op(s) }
}

fn fold_mod(fold: fold::fold<op>, doc: doc::moddoc) -> doc::moddoc {
    let doc = fold::default_seq_fold_mod(fold, doc);

    ~{
        brief: maybe_apply_op(fold.ctxt, doc.brief),
        desc: maybe_apply_op(fold.ctxt, doc.desc)
        with *doc
    }
}

fn fold_const(fold: fold::fold<op>, doc: doc::constdoc) -> doc::constdoc {
    let doc = fold::default_seq_fold_const(fold, doc);

    ~{
        brief: maybe_apply_op(fold.ctxt, doc.brief),
        desc: maybe_apply_op(fold.ctxt, doc.desc)
        with *doc
    }
}

fn fold_fn(fold: fold::fold<op>, doc: doc::fndoc) -> doc::fndoc {
    let doc = fold::default_seq_fold_fn(fold, doc);

    ~{
        brief: maybe_apply_op(fold.ctxt, doc.brief),
        desc: maybe_apply_op(fold.ctxt, doc.desc),
        args: vec::map(doc.args) {|doc|
            ~{
                desc: maybe_apply_op(fold.ctxt, doc.desc)
                with *doc
            }
        },
        return: {
            desc: maybe_apply_op(fold.ctxt, doc.return.desc)
            with doc.return
        },
        failure: maybe_apply_op(fold.ctxt, doc.failure)
        with *doc
    }
}

fn fold_enum(fold: fold::fold<op>, doc: doc::enumdoc) -> doc::enumdoc {
    ~{
        brief: maybe_apply_op(fold.ctxt, doc.brief),
        desc: maybe_apply_op(fold.ctxt, doc.desc),
        variants: vec::map(doc.variants) {|variant|
            ~{
                desc: maybe_apply_op(fold.ctxt, variant.desc)
                with *variant
            }
        }
        with *doc
    }
}

fn fold_res(fold: fold::fold<op>, doc: doc::resdoc) -> doc::resdoc {
    ~{
        brief: maybe_apply_op(fold.ctxt, doc.brief),
        desc: maybe_apply_op(fold.ctxt, doc.desc),
        args: vec::map(doc.args) {|arg|
            ~{
                desc: maybe_apply_op(fold.ctxt, arg.desc)
                with *arg
            }
        }
        with *doc
    }
}

#[test]
fn should_execute_op_on_enum_brief() {
    let source = "#[doc(brief = \" a \")] enum a { b }";
    let srv = astsrv::mk_srv_from_str(source);
    let doc = extract::from_srv(srv, "");
    let doc = attr_pass::mk_pass()(srv, doc);
    let doc = mk_pass(str::trim)(srv, doc);
    assert doc.topmod.enums[0].brief == some("a");
}

#[test]
fn should_execute_op_on_enum_desc() {
    let source = "#[doc(desc = \" a \")] enum a { b }";
    let srv = astsrv::mk_srv_from_str(source);
    let doc = extract::from_srv(srv, "");
    let doc = attr_pass::mk_pass()(srv, doc);
    let doc = mk_pass(str::trim)(srv, doc);
    assert doc.topmod.enums[0].desc == some("a");
}

#[test]
fn should_execute_op_on_variant_desc() {
    let source = "enum a { #[doc = \" a \"] b }";
    let srv = astsrv::mk_srv_from_str(source);
    let doc = extract::from_srv(srv, "");
    let doc = attr_pass::mk_pass()(srv, doc);
    let doc = mk_pass(str::trim)(srv, doc);
    assert doc.topmod.enums[0].variants[0].desc == some("a");
}

#[test]
fn should_execute_op_on_resource_brief() {
    let source = "#[doc(brief = \" a \")] resource r(a: bool) { }";
    let srv = astsrv::mk_srv_from_str(source);
    let doc = extract::from_srv(srv, "");
    let doc = attr_pass::mk_pass()(srv, doc);
    let doc = mk_pass(str::trim)(srv, doc);
    assert doc.topmod.resources()[0].brief == some("a");
}

#[test]
fn should_execute_op_on_resource_desc() {
    let source = "#[doc(desc = \" a \")] resource r(a: bool) { }";
    let srv = astsrv::mk_srv_from_str(source);
    let doc = extract::from_srv(srv, "");
    let doc = attr_pass::mk_pass()(srv, doc);
    let doc = mk_pass(str::trim)(srv, doc);
    assert doc.topmod.resources()[0].desc == some("a");
}

#[test]
fn should_execute_op_on_resource_args() {
    let source = "#[doc(args(a = \" a \"))] resource r(a: bool) { }";
    let srv = astsrv::mk_srv_from_str(source);
    let doc = extract::from_srv(srv, "");
    let doc = attr_pass::mk_pass()(srv, doc);
    let doc = mk_pass(str::trim)(srv, doc);
    assert doc.topmod.resources()[0].args[0].desc == some("a");
}