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import std::map::hashmap;
import middle::ty;
import middle::ty::*;
import metadata::encoder;
import syntax::codemap;
import syntax::print::pprust;
import syntax::print::pprust::{path_to_str, constr_args_to_str, proto_to_str,
mode_to_str};
import syntax::{ast, ast_util};
import middle::ast_map;
import driver::session::session;
fn region_to_str(cx: ctxt, region: region) -> str {
alt region {
re_block(node_id) {
alt cx.items.get(node_id) {
ast_map::node_block(blk) {
#fmt("<block at %s>", codemap::span_to_str(blk.span,
cx.sess.codemap))
}
_ { cx.sess.bug("re_block refers to non-block") }
}
}
re_self { "self" }
re_inferred { "" }
re_param(id) { #fmt("<P%u>", id) } // TODO: do better than this
re_var(id) { #fmt("<R%u>", id) } // TODO: do better than this
}
}
fn mt_to_str(cx: ctxt, m: mt) -> str {
let mstr = alt m.mutbl {
ast::m_mutbl { "mut " }
ast::m_imm { "" }
ast::m_const { "const " }
};
ret mstr + ty_to_str(cx, m.ty);
}
fn ty_to_str(cx: ctxt, typ: t) -> str {
fn fn_input_to_str(cx: ctxt, input: {mode: ast::mode, ty: t}) ->
str {
let {mode, ty} = input;
let modestr = alt canon_mode(cx, mode) {
ast::infer(_) { "" }
ast::expl(m) {
if !ty::type_has_vars(ty) &&
m == ty::default_arg_mode_for_ty(ty) {
""
} else {
mode_to_str(ast::expl(m))
}
}
};
modestr + ty_to_str(cx, ty)
}
fn fn_to_str(cx: ctxt, proto: ast::proto, ident: option<ast::ident>,
inputs: [arg], output: t, cf: ast::ret_style,
constrs: [@constr]) -> str {
let mut s = proto_to_str(proto);
alt ident { some(i) { s += " "; s += i; } _ { } }
s += "(";
let mut strs = [];
for a: arg in inputs { strs += [fn_input_to_str(cx, a)]; }
s += str::connect(strs, ", ");
s += ")";
if ty::get(output).struct != ty_nil {
s += " -> ";
alt cf {
ast::noreturn { s += "!"; }
ast::return_val { s += ty_to_str(cx, output); }
}
}
s += constrs_str(constrs);
ret s;
}
fn method_to_str(cx: ctxt, m: method) -> str {
ret fn_to_str(cx, m.fty.proto, some(m.ident), m.fty.inputs,
m.fty.output, m.fty.ret_style, m.fty.constraints) + ";";
}
fn field_to_str(cx: ctxt, f: field) -> str {
ret f.ident + ": " + mt_to_str(cx, f.mt);
}
fn parameterized(cx: ctxt, base: str, tps: [ty::t]) -> str {
if vec::len(tps) > 0u {
let strs = vec::map(tps, {|t| ty_to_str(cx, t)});
#fmt["%s<%s>", base, str::connect(strs, ",")]
} else {
base
}
}
// if there is an id, print that instead of the structural type:
alt ty::type_def_id(typ) {
some(def_id) {
let cs = ast_map::path_to_str(ty::item_path(cx, def_id));
ret alt ty::get(typ).struct {
ty_enum(_, tps) | ty_res(_, _, tps) | ty_iface(_, tps) |
ty_class(_, tps) {
parameterized(cx, cs, tps)
}
_ { cs }
};
}
none { /* fallthrough */}
}
// pretty print the structural type representation:
ret alt ty::get(typ).struct {
ty_nil { "()" }
ty_bot { "_|_" }
ty_bool { "bool" }
ty_int(ast::ty_i) { "int" }
ty_int(ast::ty_char) { "char" }
ty_int(t) { ast_util::int_ty_to_str(t) }
ty_uint(ast::ty_u) { "uint" }
ty_uint(t) { ast_util::uint_ty_to_str(t) }
ty_float(ast::ty_f) { "float" }
ty_float(t) { ast_util::float_ty_to_str(t) }
ty_str { "str" }
ty_self(ts) { parameterized(cx, "self", ts) }
ty_box(tm) { "@" + mt_to_str(cx, tm) }
ty_uniq(tm) { "~" + mt_to_str(cx, tm) }
ty_ptr(tm) { "*" + mt_to_str(cx, tm) }
ty_rptr(r, tm) { "&" + region_to_str(cx, r) + "." + mt_to_str(cx, tm) }
ty_vec(tm) { "[" + mt_to_str(cx, tm) + "]" }
ty_type { "type" }
ty_rec(elems) {
let mut strs: [str] = [];
for fld: field in elems { strs += [field_to_str(cx, fld)]; }
"{" + str::connect(strs, ",") + "}"
}
ty_tup(elems) {
let mut strs = [];
for elem in elems { strs += [ty_to_str(cx, elem)]; }
"(" + str::connect(strs, ",") + ")"
}
ty_fn(f) {
fn_to_str(cx, f.proto, none, f.inputs, f.output, f.ret_style,
f.constraints)
}
ty_var(v) { "<T" + int::str(v) + ">" }
ty_param(id, _) {
"'" + str::from_bytes([('a' as u8) + (id as u8)])
}
ty_enum(did, tps) | ty_res(did, _, tps) | ty_iface(did, tps) |
ty_class(did, tps) {
let path = ty::item_path(cx, did);
let base = ast_map::path_to_str(path);
parameterized(cx, base, tps)
}
_ { ty_to_short_str(cx, typ) }
}
}
fn ty_to_short_str(cx: ctxt, typ: t) -> str {
let mut s = encoder::encoded_ty(cx, typ);
if str::len(s) >= 32u { s = str::slice(s, 0u, 32u); }
ret s;
}
fn constr_to_str(c: @constr) -> str {
ret path_to_str(c.node.path) +
pprust::constr_args_to_str(pprust::uint_to_str, c.node.args);
}
fn constrs_str(constrs: [@constr]) -> str {
let mut s = "";
let mut 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>>)
-> str {
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
// End:
|
