rust/src/comp/util/ppaux.rs

import std::vec;
import std::istr;
import std::int;
import std::option;
import std::option::none;
import std::option::some;
import middle::ty;
import middle::ty::*;
import metadata::encoder;
import syntax::print::pp;
import syntax::print::pprust;
import syntax::print::pprust::path_to_str;
import syntax::print::pprust::constr_args_to_str;
import syntax::print::pprust::proto_to_str;
import pp::word;
import pp::eof;
import pp::zerobreak;
import pp::hardbreak;
import syntax::ast_util::ty_mach_to_str;
import syntax::ast;
import middle::ast_map;
import metadata::csearch;

fn mode_str(m: &ty::mode) -> istr {
    alt m {
      mo_val. { ~"" }
      mo_alias(false) { ~"&" }
      mo_alias(true) { ~"&mutable " }
      mo_move. { ~"-" }
    }
}

fn mode_str_1(m: &ty::mode) -> istr {
    alt m { mo_val. { ~"val" } _ { mode_str(m) } }
}

fn fn_ident_to_string(id: ast::node_id, i: &ast::fn_ident) -> istr {
    ret alt i {
      none. { ~"anon" + int::str(id) }
      some(s) { s }
    };
}

fn get_id_ident(cx: &ctxt, id: ast::def_id) -> istr {
    if id.crate != ast::local_crate {
        alt cx.ext_map.find(id) {
          some(j) { istr::connect(j, ~"::") }
          _ { fail (~"get_id_ident: can't find item in ext_map, id.crate = "
                    + int::str(id.crate)) }
        }
    } else {
        alt cx.items.find(id.node) {
          some(ast_map::node_item(it)) { it.ident }
          _ { fail "get_id_ident: can't find item in ast_map" }
        }
    }
}

fn ty_to_str(cx: &ctxt, typ: &t) -> istr {
    fn fn_input_to_str(cx: &ctxt, input: &{mode: middle::ty::mode, ty: t}) ->
       istr {
        let s = mode_str(input.mode);
        ret s + ty_to_str(cx, input.ty);
    }
    fn fn_to_str(cx: &ctxt, proto: ast::proto, ident: option::t<ast::ident>,
                 inputs: &[arg], output: t, cf: ast::controlflow,
                 constrs: &[@constr]) -> istr {
        let s = proto_to_str(proto);
        alt ident {
          some(i) {
            s += ~" ";
            s += i;
          }
          _ { }
        }
        s += ~"(";
        let strs = [];
        for a: arg in inputs { strs += [fn_input_to_str(cx, a)]; }
        s += istr::connect(strs, ~", ");
        s += ~")";
        if struct(cx, output) != ty_nil {
            alt cf {
              ast::noreturn. { s += ~" -> !"; }
              ast::return. { s += ~" -> " + ty_to_str(cx, output); }
            }
        }
        s += constrs_str(constrs);
        ret s;
    }
    fn method_to_str(cx: &ctxt, m: &method) -> istr {
        ret fn_to_str(cx, m.proto, some::<ast::ident>(m.ident), m.inputs,
                      m.output, m.cf, m.constrs) + ~";";
    }
    fn field_to_str(cx: &ctxt, f: &field) -> istr {
        ret f.ident + ~": " + mt_to_str(cx, f.mt);
    }
    fn mt_to_str(cx: &ctxt, m: &mt) -> istr {
        let mstr;
        alt m.mut {
          ast::mut. { mstr = ~"mutable "; }
          ast::imm. { mstr = ~""; }
          ast::maybe_mut. { mstr = ~"mutable? "; }
        }
        ret mstr + ty_to_str(cx, m.ty);
    }
    alt cname(cx, typ) {
      some(cs) {
        ret cs;
      }
      _ { }
    }
    ret alt struct(cx, typ) {
          ty_native(_) { ~"native" }
          ty_nil. { ~"()" }
          ty_bot. { ~"_|_" }
          ty_bool. { ~"bool" }
          ty_int. { ~"int" }
          ty_float. { ~"float" }
          ty_uint. { ~"uint" }
          ty_machine(tm) { ty_mach_to_str(tm) }
          ty_char. { ~"char" }
          ty_str. { ~"str" }
          ty_istr. { ~"istr" }
          ty_box(tm) { ~"@" + mt_to_str(cx, tm) }
          ty_uniq(t) { ~"~" + ty_to_str(cx, t) }
          ty_vec(tm) { ~"[" + mt_to_str(cx, tm) + ~"]" }
          ty_type. { ~"type" }
          ty_rec(elems) {
            let strs: [istr] = [];
            for fld: field in elems { strs += [field_to_str(cx, fld)]; }
            ~"{" + istr::connect(strs, ~",") + ~"}"
          }
          ty_tup(elems) {
            let strs = [];
            for elem in elems { strs += [ty_to_str(cx, elem)]; }
            ~"(" + istr::connect(strs, ~",") + ~")"
          }
          ty_tag(id, tps) {
            let s = get_id_ident(cx, id);
            if vec::len::<t>(tps) > 0u {
                let strs: [istr] = [];
                for typ: t in tps { strs += [ty_to_str(cx, typ)]; }
                s += ~"[" + istr::connect(strs, ~",") + ~"]";
            }
            s
          }
          ty_fn(proto, inputs, output, cf, constrs) {
            fn_to_str(cx, proto, none, inputs, output, cf, constrs)
          }
          ty_native_fn(_, inputs, output) {
            fn_to_str(cx, ast::proto_fn, none, inputs, output, ast::return,
                      [])
          }
          ty_obj(meths) {
            let strs = [];
            for m: method in meths { strs += [method_to_str(cx, m)]; }
            ~"obj {\n\t" + istr::connect(strs, ~"\n\t") + ~"\n}"
          }
          ty_res(id, _, _) { get_id_ident(cx, id) }
          ty_var(v) { ~"<T" + int::str(v) + ~">" }
          ty_param(id, _) {
            ~"'" + istr::unsafe_from_bytes([('a' as u8) + (id as u8)])
          }
          _ { ty_to_short_str(cx, typ) }
        }
}

fn ty_to_short_str(cx: &ctxt, typ: t) -> istr {
    let s = encoder::encoded_ty(cx, typ);
    if istr::byte_len(s) >= 32u { s = istr::substr(s, 0u, 32u); }
    ret s;
}

fn constr_to_str(c: &@constr) -> istr {
    ret path_to_str(c.node.path) +
        pprust::constr_args_to_str(pprust::uint_to_str, c.node.args);
}

fn constrs_str(constrs: &[@constr]) -> istr {
    let s = ~"";
    let colon = true;
    for c: @constr in constrs {
        if colon { s += ~" : "; colon = false; } else { s += ~", "; }
        s += constr_to_str(c);
    }
    ret s;
}

fn ty_constr_to_str<Q>(c: &@ast::spanned<ast::constr_general_<ast::path, Q>>)
   -> istr {
    ret path_to_str(c.node.path) +
        constr_args_to_str::<ast::path>(path_to_str, c.node.args);
}

// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End: