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|
%{
include "mash.m";
#
# mash parser. Thread safe.
#
%}
%module Mashparse
{
PATH: con "/dis/lib/mashparse.dis";
init: fn(l: Mashlib);
parse: fn(e: ref Mashlib->Env);
YYSTYPE: adt
{
cmd: ref Mashlib->Cmd;
item: ref Mashlib->Item;
items: list of ref Mashlib->Item;
flag: int;
};
YYETYPE: type ref Mashlib->Env;
}
%{
lib: Mashlib;
Cmd, Item, Stab, Env: import lib;
%}
%left Lcase Lfor Lif Lwhile Loffparen # low prec
%left Lelse
%left Lpipe
%left Leqeq Lmatch Lnoteq
%right Lcons
%left Lcaret
%left Lnot Lhd Ltl Llen
%type <flag> term
%type <item> item wgen witem word redir sword
%type <items> asimple list
%type <cmd> case cases cmd cmda cmds cmdt complex
%type <cmd> epilog expr cbrace cobrace obrace simple
%token <item> Lword
%token Lbackq Lcolon Lcolonmatch Ldefeq Leq Lmatched Lquote
%token Loncurly Lonparen Loffcurly Loffparen Lat
%token Lgreat Lgreatgreat Lless Llessgreat
%token Lfn Lin Lrescue
%token Land Leof Lsemi
%token Lerror
%%
script : tcmds
;
tcmds : # empty
| tcmds xeq
;
xeq : cmda
{ $1.xeq(e.yyenv); }
| Leof
| error
;
cmdt : # empty
{ $$ = nil; }
| cmdt cmda
{ $$ = Cmd.cmd2(Cseq, $1, $2); }
;
cmda : cmd term
{ $$ = $1.mkcmd(e.yyenv, $2); }
;
cmds : cmdt
| cmdt cmd
{ $$ = Cmd.cmd2(Cseq, $1, $2.mkcmd(e.yyenv, 0)); }
;
cmd : simple
| complex
| cmd Lpipe cmd
{ $$ = Cmd.cmd2(Cpipe, $1, $3); }
;
simple : asimple
{ $$ = e.yyenv.mksimple($1); }
| asimple Lcolon list cobrace
{
$4.words = e.yyenv.mklist($3);
$$ = Cmd.cmd1w(Cdepend, $4, e.yyenv.mklist($1));
}
;
complex : Loncurly cmds Loffcurly epilog
{ $$ = $4.cmde(Cgroup, $2, nil); }
| Lat Loncurly cmds Loffcurly epilog
{ $$ = $5.cmde(Csubgroup, $3, nil); }
| Lfor Lonparen sword Lin list Loffparen cmd
{ $$ = Cmd.cmd1i(Cfor, $7, $3); $$.words = lib->revitems($5); }
| Lif Lonparen expr Loffparen cmd
{ $$ = Cmd.cmd2(Cif, $3, $5); }
| Lif Lonparen expr Loffparen cmd Lelse cmd
{ $$ = Cmd.cmd2(Cif, $3, Cmd.cmd2(Celse, $5, $7)); }
| Lwhile Lonparen expr Loffparen cmd
{ $$ = Cmd.cmd2(Cwhile, $3, $5); }
| Lcase expr Loncurly cases Loffcurly
{ $$ = Cmd.cmd2(Ccase, $2, $4.rotcases()); }
| sword Leq list
{ $$ = Cmd.cmdiw(Ceq, $1, $3); }
| sword Ldefeq list
{ $$ = Cmd.cmdiw(Cdefeq, $1, $3); }
| Lfn word obrace
{ $$ = Cmd.cmd1i(Cfn, $3, $2); }
| Lrescue word obrace
{ $$ = Cmd.cmd1i(Crescue, $3, $2); }
| word Lcolonmatch word cbrace
{
$4.item = $3;
$$ = Cmd.cmd1i(Crule, $4, $1);
}
;
cbrace : Lcolon Loncurly cmds Loffcurly
{ $$ = Cmd.cmd1(Clistgroup, $3); }
| Loncurly cmds Loffcurly
{ $$ = Cmd.cmd1(Cgroup, $2); }
;
cobrace : # empty
{ $$ = Cmd.cmd1(Cnop, nil); }
| cbrace
;
obrace : # empty
{ $$ = nil; }
| Loncurly cmds Loffcurly
{ $$ = $2; }
;
cases : # empty
{ $$ = nil; }
| cases case
{ $$ = Cmd.cmd2(Ccases, $1, $2); }
;
case : expr Lmatched cmda
{ $$ = Cmd.cmd2(Cmatched, $1, $3); }
;
asimple : word
{ $$ = $1 :: nil; }
| asimple item
{ $$ = $2 :: $1; }
;
item : witem
| redir
;
witem : word
| wgen
;
wgen : Lbackq Loncurly cmds Loffcurly
{ $$ = Item.itemc(Ibackq, $3); }
| Lquote Loncurly cmds Loffcurly
{ $$ = Item.itemc(Iquote, $3); }
| Lless Loncurly cmds Loffcurly
{ $$ = Item.itemc(Iinpipe, $3); }
| Lgreat Loncurly cmds Loffcurly
{ $$ = Item.itemc(Ioutpipe, $3); }
;
word : Lword
| word Lcaret word
{ $$ = Item.item2(Icaret, $1, $3); }
| Lonparen expr Loffparen
{ $$ = Item.itemc(Iexpr, $2); }
;
sword : Lword
{ $$ = $1.sword(e.yyenv); }
;
list : # empty
{ $$ = nil; }
| list witem
{ $$ = $2 :: $1; }
;
epilog : # empty
{ $$ = ref Cmd; $$.error = 0; }
| epilog redir
{ $$ = $1; $1.cmdio(e.yyenv, $2); }
;
redir : Lless word
{ $$ = Item.itemr(Rin, $2); }
| Lgreat word
{ $$ = Item.itemr(Rout, $2); }
| Lgreatgreat word
{ $$ = Item.itemr(Rappend, $2); }
| Llessgreat word
{ $$ = Item.itemr(Rinout, $2); }
;
term : Lsemi
{ $$ = 0; }
| Leof
{ $$ = 0; }
| Land
{ $$ = 1; }
;
expr : Lword
{ $$ = Cmd.cmd1i(Cword, nil, $1); }
| wgen
{ $$ = Cmd.cmd1i(Cword, nil, $1); }
| Lonparen expr Loffparen
{ $$ = $2; }
| expr Lcaret expr
{ $$ = Cmd.cmd2(Ccaret, $1, $3); }
| Lhd expr
{ $$ = Cmd.cmd1(Chd, $2); }
| Ltl expr
{ $$ = Cmd.cmd1(Ctl, $2); }
| Llen expr
{ $$ = Cmd.cmd1(Clen, $2); }
| Lnot expr
{ $$ = Cmd.cmd1(Cnot, $2); }
| expr Lcons expr
{ $$ = Cmd.cmd2(Ccons, $1, $3); }
| expr Leqeq expr
{ $$ = Cmd.cmd2(Ceqeq, $1, $3); }
| expr Lnoteq expr
{ $$ = Cmd.cmd2(Cnoteq, $1, $3); }
| expr Lmatch expr
{ $$ = Cmd.cmd2(Cmatch, $1, $3); }
;
%%
init(l: Mashlib)
{
lib = l;
}
parse(e: ref Env)
{
y := ref YYENV;
y.yyenv = e;
y.yysys = lib->sys;
y.yystderr = e.stderr;
yyeparse(y);
}
yyerror(e: ref YYENV, s: string)
{
e.yyenv.report(s);
e.yyenv.suck();
}
yyelex(e: ref YYENV): int
{
return e.yyenv.lex(e.yylval);
}
|
