%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1999-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%% Purpose : Kernel Erlang (naive) prettyprinter
-module(v3_kernel_pp).
-export([format/1]).
%%-define(INCLUDE_ANNOTATIONS, 1).
-include("v3_kernel.hrl").
%% These are "internal" structures in sys_kernel which are here for
%% debugging purposes.
-record(iset, {anno=[],vars,arg,body}).
-record(ifun, {anno=[],vars,body}).
%% ====================================================================== %%
%% format(Node) -> Text
%% Node = coreErlang()
%% Text = string() | [Text]
%%
%% Prettyprint-formats (naively) an abstract Core Erlang syntax
%% tree.
-record(ctxt, {indent = 0 :: non_neg_integer(),
item_indent = 2 :: non_neg_integer(),
body_indent = 2 :: non_neg_integer(),
tab_width = 8 :: non_neg_integer()}).
canno(Cthing) -> element(2, Cthing).
-spec format(cerl:cerl()) -> iolist().
format(Node) -> format(Node, #ctxt{}).
format(Node, Ctxt) ->
case canno(Node) of
[] ->
format_1(Node, Ctxt);
[L,{file,_}] when is_integer(L) ->
format_1(Node, Ctxt);
#k{a=Anno}=K when Anno =/= [] ->
format(setelement(2, Node, K#k{a=[]}), Ctxt);
List ->
format_anno(List, Ctxt, fun (Ctxt1) ->
format_1(Node, Ctxt1)
end)
end.
-ifndef(INCLUDE_ANNOTATIONS).
%% Don't include annotations (for readability).
format_anno(_Anno, Ctxt, ObjFun) ->
ObjFun(Ctxt).
-else.
%% Include annotations (for debugging of annotations).
format_anno(Anno, Ctxt0, ObjFun) ->
Ctxt1 = ctxt_bump_indent(Ctxt0, 1),
["( ",
ObjFun(Ctxt0),
nl_indent(Ctxt1),
"-| ",io_lib:write(Anno),
" )"].
-endif.
%% format_1(Kexpr, Context) -> string().
format_1(#k_atom{val=A}, _Ctxt) -> core_atom(A);
%%format_1(#k_char{val=C}, _Ctxt) -> io_lib:write_char(C);
format_1(#k_float{val=F}, _Ctxt) -> float_to_list(F);
format_1(#k_int{val=I}, _Ctxt) -> integer_to_list(I);
format_1(#k_nil{}, _Ctxt) -> "[]";
format_1(#k_var{name=V}, _Ctxt) ->
if is_atom(V) ->
case atom_to_list(V) of
[$_|Cs] -> "_X" ++ Cs;
[C|_Cs] = L when C >= $A, C =< $Z -> L;
Cs -> [$_|Cs]
end;
is_integer(V) -> [$_|integer_to_list(V)]
end;
format_1(#k_cons{hd=H,tl=T}, Ctxt) ->
Txt = ["["|format(H, ctxt_bump_indent(Ctxt, 1))],
[Txt|format_list_tail(T, ctxt_bump_indent(Ctxt, width(Txt, Ctxt)))];
format_1(#k_tuple{es=Es}, Ctxt) ->
[${,
format_hseq(Es, ",", ctxt_bump_indent(Ctxt, 1), fun format/2),
$}
];
format_1(#k_map{var=#k_literal{val=M},op=assoc,es=Es}, Ctxt) when is_map(M), map_size(M) =:= 0 ->
["~{",
format_hseq(Es, ",", ctxt_bump_indent(Ctxt, 1), fun format/2),
"}~"
];
format_1(#k_map{var=#k_literal{val=M},op=exact,es=Es}, Ctxt) when is_map(M), map_size(M) =:= 0 ->
["::{",
format_hseq(Es, ",", ctxt_bump_indent(Ctxt, 1), fun format/2),
"}::"
];
format_1(#k_map{var=Var,op=assoc,es=Es}, Ctxt) ->
["~{",
format_hseq(Es, ",", ctxt_bump_indent(Ctxt, 1), fun format/2),
" | ",format_1(Var, Ctxt),
"}~"
];
format_1(#k_map{var=Var,op=exact,es=Es}, Ctxt) ->
["::{",
format_hseq(Es, ",", ctxt_bump_indent(Ctxt, 1), fun format/2),
" | ",format_1(Var, Ctxt),
"}::"
];
format_1(#k_map_pair{key=K,val=V}, Ctxt) ->
["<",format(K, Ctxt),",",format(V, Ctxt),">"];
format_1(#k_binary{segs=S}, Ctxt) ->
["#<",format(S, ctxt_bump_indent(Ctxt, 2)),">#"];
format_1(#k_bin_seg{next=Next}=S, Ctxt) ->
[format_bin_seg_1(S, Ctxt),
format_bin_seg(Next, ctxt_bump_indent(Ctxt, 2))];
format_1(#k_bin_int{size=Sz,unit=U,flags=Fs,val=Val,next=Next}, Ctxt) ->
S = #k_bin_seg{size=Sz,unit=U,type=integer,flags=Fs,seg=#k_int{val=Val},next=Next},
[format_bin_seg_1(S, Ctxt),
format_bin_seg(Next, ctxt_bump_indent(Ctxt, 2))];
format_1(#k_bin_end{}, _Ctxt) -> "#<>#";
format_1(#k_literal{val=Term}, _Ctxt) ->
io_lib:format("~p", [Term]);
format_1(#k_local{name=N,arity=A}, Ctxt) ->
"local " ++ format_fa_pair({N,A}, Ctxt);
format_1(#k_remote{mod=M,name=N,arity=A}, _Ctxt) ->
%% This is for our internal translator.
io_lib:format("remote ~s:~s/~w", [format(M),format(N),A]);
format_1(#k_internal{name=N,arity=A}, Ctxt) ->
"internal " ++ format_fa_pair({N,A}, Ctxt);
format_1(#k_seq{arg=A,body=B}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, 2),
["do",
nl_indent(Ctxt1),
format(A, Ctxt1),
nl_indent(Ctxt),
"then",
nl_indent(Ctxt)
| format(B, Ctxt)
];
format_1(#k_match{vars=Vs,body=Bs,ret=Rs}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.item_indent),
["match ",
format_hseq(Vs, ",", ctxt_bump_indent(Ctxt, 6), fun format/2),
nl_indent(Ctxt1),
format(Bs, Ctxt1),
nl_indent(Ctxt),
"end",
format_ret(Rs, Ctxt1)
];
format_1(#k_guard_match{vars=Vs,body=Bs,ret=Rs}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.item_indent),
["guard_match ",
format_hseq(Vs, ",", ctxt_bump_indent(Ctxt, 6), fun format/2),
nl_indent(Ctxt1),
format(Bs, Ctxt1),
nl_indent(Ctxt),
"end",
format_ret(Rs, Ctxt1)
];
format_1(#k_alt{first=O,then=T}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.item_indent),
["alt",
nl_indent(Ctxt1),
format(O, Ctxt1),
nl_indent(Ctxt1),
format(T, Ctxt1)];
format_1(#k_select{var=V,types=Cs}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, 2),
["select ",
format(V, Ctxt),
nl_indent(Ctxt1),
format_vseq(Cs, "", "", Ctxt1, fun format/2)
];
format_1(#k_type_clause{type=T,values=Cs}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
["type ",
io_lib:write(T),
nl_indent(Ctxt1),
format_vseq(Cs, "", "", Ctxt1, fun format/2)
];
format_1(#k_val_clause{val=Val,body=B}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
[format(Val, Ctxt),
" ->",
nl_indent(Ctxt1)
| format(B, Ctxt1)
];
format_1(#k_guard{clauses=Gs}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, 5),
["when ",
nl_indent(Ctxt1),
format_vseq(Gs, "", "", Ctxt1, fun format/2)];
format_1(#k_guard_clause{guard=G,body=B}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
[format(G, Ctxt),
nl_indent(Ctxt),
"->",
nl_indent(Ctxt1)
| format(B, Ctxt1)
];
format_1(#k_call{op=Op,args=As,ret=Rs}, Ctxt) ->
Txt = ["call (",format(Op, ctxt_bump_indent(Ctxt, 6)),$)],
Ctxt1 = ctxt_bump_indent(Ctxt, 2),
[Txt,format_args(As, Ctxt1),
format_ret(Rs, Ctxt1)
];
format_1(#k_enter{op=Op,args=As}, Ctxt) ->
Txt = ["enter (",format(Op, ctxt_bump_indent(Ctxt, 7)),$)],
Ctxt1 = ctxt_bump_indent(Ctxt, 2),
[Txt,format_args(As, Ctxt1)];
format_1(#k_bif{op=Op,args=As,ret=Rs}, Ctxt) ->
Txt = ["bif (",format(Op, ctxt_bump_indent(Ctxt, 5)),$)],
Ctxt1 = ctxt_bump_indent(Ctxt, 2),
[Txt,format_args(As, Ctxt1),
format_ret(Rs, Ctxt1)
];
format_1(#k_test{op=Op,args=As}, Ctxt) ->
Txt = ["test (",format(Op, ctxt_bump_indent(Ctxt, 6)),$)],
Ctxt1 = ctxt_bump_indent(Ctxt, 2),
[Txt,format_args(As, Ctxt1)];
format_1(#k_put{arg=A,ret=Rs}, Ctxt) ->
[format(A, Ctxt),
format_ret(Rs, ctxt_bump_indent(Ctxt, 1))
];
format_1(#k_try{arg=A,vars=Vs,body=B,evars=Evs,handler=H}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
["try",
nl_indent(Ctxt1),
format(A, Ctxt1),
nl_indent(Ctxt),
"of ",
format_hseq(Vs, ", ", ctxt_bump_indent(Ctxt, 3), fun format/2),
nl_indent(Ctxt1),
format(B, Ctxt1),
nl_indent(Ctxt),
"catch ",
format_hseq(Evs, ", ", ctxt_bump_indent(Ctxt, 6), fun format/2),
nl_indent(Ctxt1),
format(H, Ctxt1),
nl_indent(Ctxt),
"end"
];
format_1(#k_try_enter{arg=A,vars=Vs,body=B,evars=Evs,handler=H}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
["try_enter",
nl_indent(Ctxt1),
format(A, Ctxt1),
nl_indent(Ctxt),
"of ",
format_hseq(Vs, ", ", ctxt_bump_indent(Ctxt, 3), fun format/2),
nl_indent(Ctxt1),
format(B, Ctxt1),
nl_indent(Ctxt),
"catch ",
format_hseq(Evs, ", ", ctxt_bump_indent(Ctxt, 6), fun format/2),
nl_indent(Ctxt1),
format(H, Ctxt1),
nl_indent(Ctxt),
"end"
];
format_1(#k_protected{arg=A,ret=Rs}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
["protected",
nl_indent(Ctxt1),
format(A, Ctxt1),
nl_indent(Ctxt),
"end",
format_ret(Rs, ctxt_bump_indent(Ctxt, 1))
];
format_1(#k_catch{body=B,ret=Rs}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
["catch",
nl_indent(Ctxt1),
format(B, Ctxt1),
nl_indent(Ctxt),
"end",
format_ret(Rs, Ctxt1)
];
format_1(#k_receive{var=V,body=B,timeout=T,action=A,ret=Rs}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.item_indent),
["receive ",
format(V, Ctxt),
nl_indent(Ctxt1),
format(B, Ctxt1),
nl_indent(Ctxt),
"after ",
format(T, ctxt_bump_indent(Ctxt, 6)),
" ->",
nl_indent(Ctxt1),
format(A, Ctxt1),
nl_indent(Ctxt),
"end",
format_ret(Rs, Ctxt1)
];
format_1(#k_receive_accept{}, _Ctxt) -> "receive_accept";
format_1(#k_receive_next{}, _Ctxt) -> "receive_next";
format_1(#k_break{args=As}, Ctxt) ->
["<",
format_hseq(As, ",", ctxt_bump_indent(Ctxt, 1), fun format/2),
">"
];
format_1(#k_guard_break{args=As}, Ctxt) ->
[":<",
format_hseq(As, ",", ctxt_bump_indent(Ctxt, 1), fun format/2),
">:"
];
format_1(#k_return{args=As}, Ctxt) ->
["<<",
format_hseq(As, ",", ctxt_bump_indent(Ctxt, 1), fun format/2),
">>"
];
format_1(#k_fdef{func=F,arity=A,vars=Vs,body=B}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
["fdef ",
format_fa_pair({F,A}, ctxt_bump_indent(Ctxt, 5)),
format_args(Vs, ctxt_bump_indent(Ctxt, 14)),
" =",
nl_indent(Ctxt1),
format(B, Ctxt1)
];
format_1(#k_mdef{name=N,exports=Es,attributes=As,body=B}, Ctxt) ->
["module ",
format(#k_atom{val=N}, ctxt_bump_indent(Ctxt, 7)),
nl_indent(Ctxt),
"export [",
format_vseq(Es,
"", ",",
ctxt_bump_indent(Ctxt, 8),
fun format_fa_pair/2),
"]",
nl_indent(Ctxt),
"attributes [",
format_vseq(As,
"", ",",
ctxt_bump_indent(Ctxt, 12),
fun format_attribute/2),
"]",
nl_indent(Ctxt),
format_vseq(B,
"", "",
Ctxt,
fun format/2),
nl_indent(Ctxt)
| "end"
];
%% Internal sys_kernel structures.
format_1(#iset{vars=Vs,arg=A,body=B}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
["set <",
format_hseq(Vs, ", ", ctxt_bump_indent(Ctxt, 5), fun format/2),
"> =",
nl_indent(Ctxt1),
format(A, Ctxt1),
nl_indent(Ctxt),
"in "
| format(B, ctxt_bump_indent(Ctxt, 2))
];
format_1(#ifun{vars=Vs,body=B}, Ctxt) ->
Ctxt1 = ctxt_bump_indent(Ctxt, Ctxt#ctxt.body_indent),
["fun ",
format_args(Vs, ctxt_bump_indent(Ctxt, 4)),
" ->",
nl_indent(Ctxt1)
| format(B, Ctxt1)
];
format_1(Type, _Ctxt) ->
["** Unsupported type: ",
io_lib:write(Type)
| " **"
].
%% format_ret([RetVar], Context) -> Txt.
%% Format the return vars of kexpr.
format_ret(Rs, Ctxt) ->
[" >> ",
"<",
format_hseq(Rs, ",", ctxt_bump_indent(Ctxt, 5), fun format/2),
">"].
%% format_args([Arg], Context) -> Txt.
%% Format arguments.
format_args(As, Ctxt) ->
[$(,format_hseq(As, ", ", ctxt_bump_indent(Ctxt, 1), fun format/2),$)].
%% format_hseq([Thing], Separator, Context, Fun) -> Txt.
%% Format a sequence horizontally.
format_hseq([H], _Sep, Ctxt, Fun) ->
Fun(H, Ctxt);
format_hseq([H|T], Sep, Ctxt, Fun) ->
Txt = [Fun(H, Ctxt)|Sep],
Ctxt1 = ctxt_bump_indent(Ctxt, width(Txt, Ctxt)),
[Txt|format_hseq(T, Sep, Ctxt1, Fun)];
format_hseq([], _, _, _) -> "".
%% format_vseq([Thing], LinePrefix, LineSuffix, Context, Fun) -> Txt.
%% Format a sequence vertically.
format_vseq([H], _Pre, _Suf, Ctxt, Fun) ->
Fun(H, Ctxt);
format_vseq([H|T], Pre, Suf, Ctxt, Fun) ->
[Fun(H, Ctxt),Suf,nl_indent(Ctxt),Pre|
format_vseq(T, Pre, Suf, Ctxt, Fun)];
format_vseq([], _, _, _, _) -> "".
format_fa_pair({F,A}, _Ctxt) -> [core_atom(F),$/,integer_to_list(A)].
%% format_attribute({Name,Val}, Context) -> Txt.
format_attribute({Name,Val}, Ctxt) when is_list(Val) ->
Txt = format(#k_atom{val=Name}, Ctxt),
Ctxt1 = ctxt_bump_indent(Ctxt, width(Txt,Ctxt)+4),
[Txt," = ",
$[,format_vseq(Val, "", ",", Ctxt1,
fun (A, _C) -> io_lib:write(A) end),$]
];
format_attribute({Name,Val}, Ctxt) ->
Txt = format(#k_atom{val=Name}, Ctxt),
[Txt," = ",io_lib:write(Val)].
format_list_tail(#k_nil{anno=[]}, _Ctxt) -> "]";
format_list_tail(#k_cons{anno=[],hd=H,tl=T}, Ctxt) ->
Txt = [$,|format(H, Ctxt)],
Ctxt1 = ctxt_bump_indent(Ctxt, width(Txt, Ctxt)),
[Txt|format_list_tail(T, Ctxt1)];
format_list_tail(Tail, Ctxt) ->
["|",format(Tail, ctxt_bump_indent(Ctxt, 1)), "]"].
format_bin_seg([], _Ctx) -> "";
format_bin_seg(#k_bin_end{anno=[]}, _Ctxt) -> "";
format_bin_seg(#k_bin_seg{anno=[],next=N}=Seg, Ctxt) ->
Txt = [$,|format_bin_seg_1(Seg, Ctxt)],
[Txt|format_bin_seg(N, ctxt_bump_indent(Ctxt, width(Txt, Ctxt)))];
format_bin_seg(Seg, Ctxt) ->
["|",format(Seg, ctxt_bump_indent(Ctxt, 2))].
format_bin_seg_1(#k_bin_seg{size=S,unit=U,type=T,flags=Fs,seg=Seg}, Ctxt) ->
[format(Seg, Ctxt),
":",format(S, Ctxt),"*",io_lib:write(U),
":",io_lib:write(T),
[[$-,io_lib:write(F)] || F <- Fs]
].
% format_bin_elements(#k_binary_cons{hd=H,tl=T,size=S,info=I}, Ctxt) ->
% A = canno(T),
% Fe = fun (Eh, Es, Ei, Ct) ->
% [format(Eh, Ct),":",format(Es, Ct),"/",io_lib:write(Ei)]
% end,
% case T of
% #k_zero_binary{} when A == [] ->
% Fe(H, S, I, Ctxt);
% #k_binary_cons{} when A == [] ->
% Txt = [Fe(H, S, I, Ctxt)|","],
% Ctxt1 = ctxt_bump_indent(Ctxt, width(Txt, Ctxt)),
% [Txt|format_bin_elements(T, Ctxt1)];
% _ ->
% Txt = [Fe(H, S, I, Ctxt)|"|"],
% [Txt|format(T, ctxt_bump_indent(Ctxt, width(Txt, Ctxt)))]
% end.
indent(Ctxt) -> indent(Ctxt#ctxt.indent, Ctxt).
indent(N, _Ctxt) when N =< 0 -> "";
indent(N, Ctxt) ->
T = Ctxt#ctxt.tab_width,
string:chars($\t, N div T, string:chars($\s, N rem T)).
nl_indent(Ctxt) -> [$\n|indent(Ctxt)].
unindent(T, Ctxt) ->
unindent(T, Ctxt#ctxt.indent, Ctxt, []).
unindent(T, N, _Ctxt, C) when N =< 0 ->
[T|C];
unindent([$\s|T], N, Ctxt, C) ->
unindent(T, N - 1, Ctxt, C);
unindent([$\t|T], N, Ctxt, C) ->
Tab = Ctxt#ctxt.tab_width,
if N >= Tab ->
unindent(T, N - Tab, Ctxt, C);
true ->
unindent([string:chars($\s, Tab - N)|T], 0, Ctxt, C)
end;
unindent([L|T], N, Ctxt, C) when is_list(L) ->
unindent(L, N, Ctxt, [T|C]);
unindent([H|T], _N, _Ctxt, C) ->
[H|[T|C]];
unindent([], N, Ctxt, [H|T]) ->
unindent(H, N, Ctxt, T);
unindent([], _, _, []) -> [].
width(Txt, Ctxt) ->
width(Txt, 0, Ctxt, []).
width([$\t|T], A, Ctxt, C) ->
width(T, A + Ctxt#ctxt.tab_width, Ctxt, C);
width([$\n|T], _A, Ctxt, C) ->
width(unindent([T|C], Ctxt), Ctxt);
width([H|T], A, Ctxt, C) when is_list(H) ->
width(H, A, Ctxt, [T|C]);
width([_|T], A, Ctxt, C) ->
width(T, A + 1, Ctxt, C);
width([], A, Ctxt, [H|T]) ->
width(H, A, Ctxt, T);
width([], A, _, []) -> A.
ctxt_bump_indent(Ctxt, Dx) ->
Ctxt#ctxt{indent=Ctxt#ctxt.indent + Dx}.
core_atom(A) -> io_lib:write_string(atom_to_list(A), $').
