/* Copyright 2011
* Kaz Kylheku <kaz@kylheku.com>
* Vancouver, Canada
* All rights reserved.
*
* BSD License:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
%{
#include <stdio.h>
#include <assert.h>
#include <limits.h>
#include <dirent.h>
#include <stdlib.h>
#include <wchar.h>
#include "config.h"
#include "lib.h"
#include "regex.h"
#include "utf8.h"
#include "match.h"
#include "hash.h"
#include "parser.h"
int yylex(void);
void yyerror(const char *);
static val repeat_rep_helper(val sym, val main, val parts);
static val o_elems_transform(val output_form);
static val define_transform(val define_form);
static val lit_char_helper(val litchars);
static wchar_t char_from_name(wchar_t *name);
static val parsed_spec;
%}
%union {
wchar_t *lexeme;
union obj *val;
wchar_t chr;
cnum num, lineno;
}
%token <lexeme> SPACE TEXT IDENT KEYWORD METAVAR
%token <lineno> ALL SOME NONE MAYBE CASES CHOOSE GATHER
%token <lineno> AND OR END COLLECT
%token <lineno> UNTIL COLL OUTPUT REPEAT REP SINGLE FIRST LAST EMPTY DEFINE
%token <lineno> TRY CATCH FINALLY
%token <lineno> ERRTOK /* deliberately not used in grammar */
%token <lineno> HASH_BACKSLASH
%token <num> NUMBER
%token <chr> REGCHAR LITCHAR
%token <chr> METAPAR SPLICE
%type <val> spec clauses clauses_opt clause
%type <val> all_clause some_clause none_clause maybe_clause
%type <val> cases_clause choose_clause gather_clause collect_clause until_last
%type <val> clause_parts additional_parts
%type <val> output_clause define_clause try_clause catch_clauses_opt
%type <val> line elems_opt elems clause_parts_h additional_parts_h
%type <val> elem var var_op meta_expr
%type <val> list exprs exprs_opt expr out_clauses out_clauses_opt out_clause
%type <val> repeat_clause repeat_parts_opt o_line
%type <val> o_elems_opt o_elems_opt2 o_elems o_elem o_var rep_elem rep_parts_opt
%type <val> regex regexpr regbranch
%type <val> regterm regclass regclassterm regrange
%type <val> strlit chrlit quasilit quasi_items quasi_item litchars
%type <chr> regchar
%type <lineno> '('
%nonassoc LOW /* used for precedence assertion */
%right IDENT '{' '}'
%right ALL SOME NONE MAYBE CASES CHOOSE AND OR END COLLECT UNTIL COLL
%right OUTPUT REPEAT REP FIRST LAST EMPTY DEFINE
%right SPACE TEXT NUMBER
%nonassoc '[' ']' '(' ')'
%left '-' ',' '\'' SPLICE
%left '|' '/'
%left '&'
%right '~' '*' '?' '+' '%'
%right '.' REGCHAR LITCHAR
%%
spec : clauses { parsed_spec = $1; }
| /* empty */ { parsed_spec = nil; }
| error '\n' { parsed_spec = nil;
if (errors >= 8)
YYABORT;
yyerrok;
yybadtoken(yychar, nil); }
;
clauses : clause { $$ = cons($1, nil); }
| clause clauses { $$ = cons($1, $2); }
;
clauses_opt : clauses { $$ = $1; }
| /* empty */ { $$ = nil; }
;
clause : all_clause { $$ = list($1, nao); rlcp($$, $1); }
| some_clause { $$ = list($1, nao); rlcp($$, $1); }
| none_clause { $$ = list($1, nao); rlcp($$, $1); }
| maybe_clause { $$ = list($1, nao); rlcp($$, $1); }
| cases_clause { $$ = list($1, nao); rlcp($$, $1); }
| choose_clause { $$ = list($1, nao); rlcp($$, $1); }
| collect_clause { $$ = list($1, nao); rlcp($$, $1); }
| gather_clause { $$ = list($1, nao); rlcp($$, $1); }
| define_clause { $$ = list(define_transform($1), nao);
rlcp(car($$), $1);
rlcp($$, $1); }
| try_clause { $$ = list($1, nao); rlcp($$, $1); }
| output_clause { $$ = list($1, nao); rlcp($$, $1); }
| line { $$ = $1; }
| repeat_clause { $$ = nil;
yyerror("repeat outside of output"); }
;
all_clause : ALL newl clause_parts { $$ = list(all_s, $3, nao);
rl($$, num($1)); }
| ALL newl error { $$ = nil;
yybadtoken(yychar,
lit("all clause")); }
| ALL newl END newl { $$ = nil;
yyerror("empty all clause"); }
;
some_clause : SOME exprs_opt ')'
newl clause_parts { $$ = list(some_s, $5, $2, nao);
rl($$, num($1)); }
| SOME exprs_opt ')'
newl error
{ $$ = nil;
yybadtoken(yychar,
lit("some clause")); }
| SOME exprs_opt ')'
newl END newl { $$ = nil;
yyerror("empty some clause"); }
;
none_clause : NONE newl clause_parts { $$ = list(none_s, $3, nao);
rl($$, num($1)); }
| NONE newl error { $$ = nil;
yybadtoken(yychar,
lit("none clause")); }
| NONE newl END newl { $$ = nil;
yyerror("empty none clause"); }
;
maybe_clause : MAYBE newl clause_parts { $$ = list(maybe_s, $3, nao);
rl($$, num($1)); }
| MAYBE newl error { $$ = nil;
yybadtoken(yychar,
lit("maybe clause")); }
| MAYBE newl END newl { $$ = nil;
yyerror("empty maybe clause"); }
;
cases_clause : CASES newl clause_parts { $$ = list(cases_s, $3, nao);
rl($$, num($1)); }
| CASES newl error { $$ = nil;
yybadtoken(yychar,
lit("cases clause")); }
| CASES newl END newl { $$ = nil;
yyerror("empty cases clause"); }
;
choose_clause : CHOOSE exprs_opt ')'
newl clause_parts { $$ = list(choose_s, $5, $2, nao);
rl($$, num($1)); }
| CHOOSE exprs_opt ')'
newl error { $$ = nil;
yybadtoken(yychar,
lit("choose clause")); }
| CHOOSE exprs_opt ')'
newl END newl { $$ = nil;
yyerror("empty choose clause"); }
;
gather_clause : GATHER exprs_opt ')'
newl clause_parts { $$ = list(gather_s,
append2(mapcar(curry_12_1(func_n2(cons), nil),
first($5)), rest($5)),
$2, nao);
rl($$, num($1)); }
| GATHER exprs_opt ')'
newl error { $$ = nil;
yybadtoken(yychar,
lit("gather clause")); }
| GATHER exprs_opt ')'
newl END newl { $$ = nil;
yyerror("empty gather clause"); }
;
collect_clause : COLLECT exprs_opt ')' newl
clauses END newl { $$ = list(collect_s,
$5, nil, $2,
nao);
rl($$, num($1)); }
| COLLECT exprs_opt ')'
newl clauses until_last
newl clauses END newl { $$ = list(collect_s, $5,
cons(cdr($6), $8),
$2, nao);
rl($$, num($1));
rl($8, car($6)); }
| COLLECT exprs_opt ')'
newl error { $$ = nil;
if (yychar == UNTIL ||
yychar == END ||
yychar == LAST)
yyerror("empty collect");
else
yybadtoken(yychar,
lit("collect clause")); }
;
until_last : UNTIL { $$ = cons(num($1), until_s); }
| LAST { $$ = cons(num($1), last_s); }
;
clause_parts : clauses additional_parts { $$ = cons($1, $2); }
;
additional_parts : END newl { $$ = nil; }
| AND newl clauses additional_parts { $$ = cons($3, $4); }
| OR newl clauses additional_parts { $$ = cons($3, $4); }
;
line : elems_opt '\n' { $$ = $1; }
;
elems_opt : elems { $$ = $1; }
| { $$ = nil; }
;
elems : elem { $$ = cons($1, nil);
rlcp($$, $1); }
| elem elems { $$ = cons($1, $2);
rlcp($$, $1); }
| rep_elem { $$ = nil;
yyerror("rep outside of output"); }
;
elem : TEXT { $$ = rl(string_own($1), num(lineno)); }
| SPACE { if ($1[0] == ' ' && $1[1] == 0)
{ val spaces = list(oneplus_s,
chr(' '), nao);
$$ = cons(regex_compile(spaces), spaces);
rl($$, num(lineno));
free($1); }
else
{ $$ = rl(string_own($1), num(lineno)); }}
| var { $$ = rl($1, num(lineno)); }
| list { $$ = $1; }
| regex { $$ = cons(regex_compile(rest($1)),
rest($1));
rl($$, num(lineno)); }
| COLL exprs_opt ')' elems END { $$ = list(coll_s, $4, nil, $2, nao);
rl($$, num($1)); }
| COLL exprs_opt ')' elems
until_last elems END { $$ = list(coll_s, $4, cons(cdr($5), $6),
$2, nao);
rl($$, num($1));
rl($6, car($5)); }
| COLL error { $$ = nil;
yybadtoken(yychar, lit("coll clause")); }
| ALL clause_parts_h { $$ = rl(list(all_s, t, $2, nao), num($1)); }
| ALL END { yyerror("empty all clause"); }
| SOME exprs_opt ')'
clause_parts_h { $$ = rl(list(some_s, t, $4, $2, nao), num($1)); }
| SOME exprs_opt ')' END { yyerror("empty some clause"); }
| NONE clause_parts_h { $$ = rl(list(none_s, t, $2, nao), num($1)); }
| NONE END { yyerror("empty none clause"); }
| MAYBE clause_parts_h { $$ = rl(list(maybe_s, t, $2, nao), num($1)); }
| MAYBE END { yyerror("empty maybe clause"); }
| CASES clause_parts_h { $$ = rl(list(cases_s, t, $2, nao), num($1)); }
| CASES END { yyerror("empty cases clause"); }
| CHOOSE exprs_opt ')'
clause_parts_h { $$ = list(choose_s, t, $4, $2, nao);
rl($$, num($1)); }
| CHOOSE exprs_opt ')' END { yyerror("empty cases clause"); }
| DEFINE exprs ')' elems END { $$ = list(define_s, t, $4, $2, nao);
rl($$, num($1)); }
;
clause_parts_h : elems additional_parts_h { $$ = cons($1, $2); }
;
additional_parts_h : END { $$ = nil; }
| AND elems additional_parts_h { $$ = cons($2, $3); }
| OR elems additional_parts_h { $$ = cons($2, $3); }
;
define_clause : DEFINE exprs ')' newl
clauses_opt
END newl { $$ = list(define_s, $2, $5, nao);
rl($$, num($1)); }
| DEFINE ')' newl
clauses_opt
END newl { $$ = list(define_s, nil, $4, nao);
rl($$, num($1)); }
| DEFINE error { $$ = nil;
yybadtoken(yychar, lit("list expression")); }
| DEFINE exprs ')' newl
error { $$ = nil; yybadtoken(yychar, lit("define")); }
| DEFINE ')' newl
error { $$ = nil;
yybadtoken(yychar, lit("define")); }
;
try_clause : TRY newl
clauses
catch_clauses_opt
END newl { $$ = list(try_s,
flatten(mapcar(func_n1(second),
$4)),
$3, $4, nao);
rl($$, num($1)); }
| TRY newl
error { $$ = nil;
if (yychar == END || yychar == CATCH ||
yychar == FINALLY)
yyerror("empty try clause");
else
yybadtoken(yychar, lit("try clause")); }
| TRY newl
clauses
error { $$ = nil;
yybadtoken(yychar, lit("try clause")); }
;
catch_clauses_opt : CATCH ')' newl
clauses_opt
catch_clauses_opt { $$ = cons(list(catch_s, cons(t, nil),
$4, nao), $5);
rl($$, num($1)); }
| CATCH exprs ')' newl
clauses_opt
catch_clauses_opt { $$ = cons(list(catch_s, $2, $5, nao),
$6);
rl($$, num($1)); }
| FINALLY newl
clauses_opt { $$ = cons(list(finally_s, nil,
$3, nao),
nil);
rl($$, num($1)); }
| { $$ = nil; }
| CATCH ')' newl
error { $$ = nil;
yybadtoken(yychar,
lit("try clause")); }
| CATCH exprs ')' newl
error { $$ = nil;
yybadtoken(yychar,
lit("try clause")); }
| FINALLY newl
error { $$ = nil;
yybadtoken(yychar,
lit("try clause")); }
;
output_clause : OUTPUT ')' o_elems '\n'
out_clauses
END newl { $$ = nil;
yyerror("obsolete output syntax: trailing material"); }
| OUTPUT ')' newl
END newl { $$ = rl(list(output_s, nao), num($1)); }
| OUTPUT ')' newl
out_clauses
END newl { $$ = rl(list(output_s, $4, nao), num($1)); }
| OUTPUT exprs ')' newl
out_clauses
END newl { $$ = list(output_s, $5, $2, nao);
rl($$, num($1)); }
| OUTPUT exprs ')' o_elems '\n'
out_clauses
END newl { $$ = nil;
yyerror("invalid combination of old and "
"new syntax in output directive"); }
| OUTPUT error { $$ = nil;
yybadtoken(yychar, lit("list expression")); }
| OUTPUT ')' o_elems '\n'
error { $$ = nil;
yybadtoken(yychar, lit("output clause")); }
| OUTPUT ')' newl
error { $$ = nil;
yybadtoken(yychar, lit("output clause")); }
| OUTPUT exprs ')' o_elems '\n'
error { $$ = nil;
yybadtoken(yychar, lit("output clause")); }
| OUTPUT exprs ')' newl
error { $$ = nil;
yybadtoken(yychar, lit("output clause")); }
;
out_clauses : out_clause { $$ = cons($1, nil); }
| out_clause out_clauses { $$ = cons($1, $2); }
;
out_clause : repeat_clause { $$ = cons($1, nil); }
| o_line { $$ = $1; }
| all_clause { $$ = nil;
yyerror("match clause in output"); }
| some_clause { $$ = nil;
yyerror("match clause in output"); }
| none_clause { $$ = nil;
yyerror("match clause in output"); }
| maybe_clause { $$ = nil;
yyerror("match clause in output"); }
| cases_clause { $$ = nil;
yyerror("match clause in output"); }
| choose_clause { $$ = nil;
yyerror("choose clause in output"); }
| collect_clause { $$ = nil;
yyerror("match clause in output"); }
| define_clause { $$ = nil;
yyerror("match clause in output"); }
| try_clause { $$ = nil;
yyerror("match clause in output"); }
| output_clause { $$ = nil;
yyerror("match clause in output"); }
;
repeat_clause : REPEAT newl
out_clauses_opt
repeat_parts_opt
END newl { $$ = repeat_rep_helper(repeat_s, $3, $4);
rl($$, num($1)); }
| REPEAT newl
error { $$ = nil;
yybadtoken(yychar, lit("repeat clause")); }
;
repeat_parts_opt : SINGLE newl
out_clauses_opt
repeat_parts_opt { $$ = cons(cons(single_s, $3), $4);
rl($$, num($1)); }
| FIRST newl
out_clauses_opt
repeat_parts_opt { $$ = cons(cons(first_s, $3), $4);
rl($$, num($1)); }
| LAST newl
out_clauses_opt
repeat_parts_opt { $$ = cons(cons(last_s, $3), $4);
rl($$, num($1)); }
| EMPTY newl
out_clauses_opt
repeat_parts_opt { $$ = cons(cons(empty_s, $3), $4);
rl($$, num($1)); }
| /* empty */ { $$ = nil; }
;
out_clauses_opt : out_clauses { $$ = $1; }
| /* empty */ { $$ = null_list; }
o_line : o_elems_opt '\n' { $$ = $1; }
;
o_elems_opt : o_elems { $$ = o_elems_transform($1);
rl($$, num(lineno)); }
| { $$ = nil; }
;
o_elems_opt2 : o_elems { $$ = o_elems_transform($1);
rl($$, num(lineno)); }
| { $$ = null_list; }
;
o_elems : o_elem { $$ = cons($1, nil); }
| o_elem o_elems { $$ = cons($1, $2); }
;
o_elem : TEXT { $$ = string_own($1);
rl($$, num(lineno)); }
| SPACE { $$ = string_own($1);
rl($$, num(lineno)); }
| o_var { $$ = $1; }
| rep_elem { $$ = $1; }
;
rep_elem : REP o_elems_opt
rep_parts_opt END { $$ = repeat_rep_helper(rep_s,
o_elems_transform($2),
$3);
rl($$, num($1)); }
| REP error { $$ = nil;
yybadtoken(yychar, lit("rep clause")); }
;
rep_parts_opt : SINGLE o_elems_opt2
rep_parts_opt { $$ = cons(cons(single_s, $2), $3);
rl($$, num($1)); }
| FIRST o_elems_opt2
rep_parts_opt { $$ = cons(cons(first_s, $2), $3);
rl($$, num($1)); }
| LAST o_elems_opt2
rep_parts_opt { $$ = cons(cons(last_s, $2), $3);
rl($$, num($1)); }
| EMPTY o_elems_opt2
rep_parts_opt { $$ = cons(cons(empty_s, $2), $3);
rl($$, num($1)); }
| /* empty */ { $$ = nil; }
;
/* This sucks, but factoring '*' into a nonterminal
* that generates an empty phrase causes reduce/reduce conflicts.
*/
var : IDENT { $$ = list(var_s, intern(string_own($1), nil),
nao); }
| IDENT elem { $$ = list(var_s, intern(string_own($1), nil),
$2, nao); }
| '{' IDENT '}' { $$ = list(var_s, intern(string_own($2), nil),
nao); }
| '{' IDENT '}' elem { $$ = list(var_s, intern(string_own($2), nil),
$4, nao); }
| '{' IDENT exprs '}' { $$ = list(var_s, intern(string_own($2), nil),
nil, $3, nao); }
| '{' IDENT exprs '}' elem { $$ = list(var_s, intern(string_own($2), nil),
$5, $3, nao); }
| var_op IDENT { $$ = list(var_s, intern(string_own($2), nil),
nil, $1, nao); }
| var_op IDENT elem { $$ = list(var_s, intern(string_own($2), nil),
$3, $1, nao); }
| var_op '{' IDENT '}' { $$ = list(var_s, intern(string_own($3), nil),
nil, $1, nao); }
| var_op '{' IDENT '}' elem { $$ = list(var_s, intern(string_own($3), nil),
$5, $1, nao); }
| var_op '{' IDENT regex '}' { $$ = nil;
yyerror("longest match "
"not useable with regex"); }
| var_op '{' IDENT NUMBER '}' { $$ = nil;
yyerror("longest match "
"not useable with "
"fixed width match"); }
| IDENT error { $$ = nil;
yybadtoken(yychar, lit("variable spec")); }
| var_op error { $$ = nil;
yybadtoken(yychar, lit("variable spec")); }
;
o_var : IDENT { $$ = list(var_s, intern(string_own($1), nil),
nao); }
| IDENT o_elem { $$ = list(var_s, intern(string_own($1), nil),
$2, nao); }
| '{' IDENT '}' { $$ = list(var_s, intern(string_own($2), nil),
nao); }
| '{' IDENT '}' o_elem { $$ = list(var_s, intern(string_own($2), nil),
$4, nao); }
| '{' IDENT exprs '}' { $$ = list(var_s, intern(string_own($2), nil),
nil, $3, nao); }
| '{' IDENT exprs '}' o_elem { $$ = list(var_s,
intern(string_own($2), nil),
$5, $3, nao); }
| IDENT error { $$ = nil;
yybadtoken(yychar, lit("variable spec")); }
;
var_op : '*' { $$ = list(t, nao); }
;
list : '(' exprs ')' { $$ = rl($2, num($1)); }
| '(' ')' { $$ = nil; }
| ',' expr { $$ = rlcp(list(unquote_s, $2, nao), $2); }
| '\'' expr { $$ = rlcp(list(qquote_s, $2, nao), $2); }
| SPLICE expr { $$ = rlcp(list(splice_s, $2, nao), $2); }
| '(' error { $$ = nil;
yybadtoken(yychar, lit("list expression")); }
;
meta_expr : METAPAR exprs ')' { $$ = cons(expr_s, $2); }
| METAPAR ')' { $$ = cons(expr_s, nil); }
| METAPAR error { $$ = nil;
yybadtoken(yychar, lit("meta expression")); }
;
exprs : expr { $$ = cons($1, nil); }
| expr exprs { $$ = cons($1, $2); }
| expr '.' expr { $$ = cons($1, $3); }
;
exprs_opt : exprs { $$ = $1; }
| /* empty */ { $$ = nil; }
;
expr : IDENT { $$ = intern(string_own($1), nil); }
| KEYWORD { $$ = intern(string_own($1),
keyword_package); }
| METAVAR { $$ = list(var_s,
intern(string_own($1), nil), nao); }
| NUMBER { $$ = num($1); }
| list { $$ = $1; }
| meta_expr { $$ = $1; }
| regex { $$ = cons(regex_compile(rest($1)),
rest($1)); }
| chrlit { $$ = $1; }
| strlit { $$ = $1; }
| quasilit { $$ = $1; }
;
regex : '/' regexpr '/' { $$ = cons(regex_s, $2); end_of_regex();
rl($$, num(lineno)); }
| '/' error { $$ = nil;
yybadtoken(yychar, lit("regex"));
end_of_regex(); }
;
regexpr : regbranch { $$ = if3(cdr($1),
cons(compound_s, $1),
car($1)); }
| regexpr '|' regexpr { $$ = list(or_s, $1, $3, nao); }
| regexpr '&' regexpr { $$ = list(and_s, $1, $3, nao); }
| '~' regexpr { $$ = list(compl_s, $2, nao); }
| /* empty */ %prec LOW { $$ = nil; }
;
regbranch : regterm %prec LOW { $$ = cons($1, nil); }
| regterm regbranch { $$ = cons($1, $2); }
| regterm '~' regexpr { $$ = list($1, list(compl_s, $3, nao), nao); }
;
regterm : regterm '*' { $$ = list(zeroplus_s, $1, nao); }
| regterm '+' { $$ = list(oneplus_s, $1, nao); }
| regterm '?' { $$ = list(optional_s, $1, nao); }
| regterm '%' regexpr { $$ = list(nongreedy_s, $1, $3, nao); }
| '[' regclass ']' { if (first($2) == chr('^'))
{ if (rest($2))
$$ = cons(cset_s, rest($2));
else
$$ = wild_s; }
else
$$ = cons(set_s, $2); }
| '[' ']' { $$ = cons(set_s, nil); }
| '[' error { $$ = nil;
yybadtoken(yychar,
lit("regex character class")); }
| '.' { $$ = wild_s; }
| ']' { $$ = chr(']'); }
| '-' { $$ = chr('-'); }
| REGCHAR { $$ = chr($1); }
| '(' regexpr ')' { $$ = $2; }
| '(' error { $$ = nil;
yybadtoken(yychar,
lit("regex subexpression")); }
;
regclass : regclassterm { $$ = cons($1, nil); }
| regclassterm regclass { $$ = cons($1, $2); }
;
regclassterm : regrange { $$ = $1; }
| regchar { $$ = chr($1); }
;
regrange : regchar '-' regchar { $$ = cons(chr($1), chr($3)); }
regchar : '?' { $$ = '?'; }
| '.' { $$ = '.'; }
| '*' { $$ = '*'; }
| '+' { $$ = '+'; }
| '(' { $$ = '('; }
| ')' { $$ = ')'; }
| '|' { $$ = '|'; }
| '~' { $$ = '~'; }
| '&' { $$ = '&'; }
| '%' { $$ = '%'; }
| '/' { $$ = '/'; }
| REGCHAR { $$ = $1; }
;
newl : '\n'
| error '\n' { yyerror("newline expected after directive");
yyerrok; }
;
strlit : '"' '"' { $$ = null_string; }
| '"' litchars '"' { $$ = lit_char_helper($2); }
| '"' error { $$ = nil;
yybadtoken(yychar, lit("string literal")); }
;
chrlit : HASH_BACKSLASH IDENT { wchar_t ch = char_from_name($2);
val str = string_own($2);
end_of_char();
if (ch == L'!')
{ yyerrorf(lit("unknown character name: ~a"),
str, nao); }
$$ = chr(ch); }
| HASH_BACKSLASH LITCHAR { $$ = chr($2);
end_of_char(); }
| HASH_BACKSLASH error { $$ = nil;
yybadtoken(yychar,
lit("character literal")); }
;
quasilit : '`' '`' { $$ = null_string; }
| '`' quasi_items '`' { $$ = cons(quasi_s, o_elems_transform($2));
rl($$, num(lineno)); }
| '`' error { $$ = nil;
yybadtoken(yychar, lit("string literal")); }
;
quasi_items : quasi_item { $$ = cons($1, nil); }
| quasi_item quasi_items { $$ = cons($1, $2); }
;
quasi_item : litchars { $$ = lit_char_helper($1); }
| TEXT { $$ = string_own($1); }
| var { $$ = $1; }
| list { $$ = $1; }
;
litchars : LITCHAR { $$ = cons(chr($1), nil); }
| LITCHAR litchars { $$ = cons(chr($1), $2); }
;
%%
static val repeat_rep_helper(val sym, val main, val parts)
{
val single_parts = nil;
val first_parts = nil;
val last_parts = nil;
val empty_parts = nil;
val iter;
for (iter = parts; iter != nil; iter = cdr(iter)) {
val part = car(iter);
val sym = car(part);
val clauses = cdr(part);
if (sym == single_s)
single_parts = nappend2(single_parts, clauses);
else if (sym == first_s)
first_parts = nappend2(first_parts, clauses);
else if (sym == last_s)
last_parts = nappend2(last_parts, clauses);
else if (sym == empty_s)
empty_parts = nappend2(empty_parts, clauses);
else
abort();
}
return list(sym, main, single_parts, first_parts,
last_parts, empty_parts, nao);
}
static val o_elems_transform(val o_elems)
{
list_collect_decl(o_elems_out, ptail);
val iter;
for (iter = o_elems; iter; iter = cdr(iter)) {
val elem = car(iter);
while (consp(elem) && first(elem) == var_s) {
val sym = second(elem);
val pat = third(elem);
val modifiers = fourth(elem);
list_collect(ptail, list(first(elem), sym, nil, modifiers, nao));
elem = pat;
}
if (elem)
list_collect(ptail, elem);
}
return o_elems_out;
}
static val define_transform(val define_form)
{
val sym = first(define_form);
val args = second(define_form);
if (define_form == nil)
return nil;
assert (sym == define_s);
if (args == nil) {
yyerror("define requires arguments");
return define_form;
}
if (!consp(args) || !listp(cdr(args))) {
yyerror("bad define argument syntax");
return define_form;
} else {
val name = first(args);
val params = second(args);
if (!symbolp(name)) {
yyerror("function name must be a symbol");
return define_form;
}
if (!proper_listp(params)) {
yyerror("invalid function parameter list");
return define_form;
}
if (!all_satisfy(params, func_n1(symbolp), nil))
yyerror("function parameters must be symbols");
}
return define_form;
}
static val lit_char_helper(val litchars)
{
val ret = nil;
if (litchars) {
val len = length(litchars), iter, ix;
ret = mkustring(len);
for (iter = litchars, ix = zero;
iter;
iter = cdr(iter), ix = plus(ix, one))
{
chr_str_set(ret, ix, car(iter));
}
} else {
ret = nil;
}
return ret;
}
val rl(val form, val lineno)
{
sethash(form_to_ln_hash, form, lineno);
pushhash(ln_to_forms_hash, lineno, form);
return form;
}
static wchar_t char_from_name(wchar_t *name)
{
static struct {
const wchar_t *name;
const wchar_t ch;
} map[] = {
{ L"nul", 0 },
{ L"alarm", L'\a' },
{ L"backspace", L'\b' },
{ L"tab", L'\t' },
{ L"linefeed", L'\n' },
{ L"newline", L'\n' },
{ L"vtab", L'\v' },
{ L"page", L'\f' },
{ L"return", L'\r' },
{ L"esc", 27 },
{ L"space", L' ' },
{ 0, 0 },
};
int i;
for (i = 0; map[i].name; i++) {
if (wcscmp(map[i].name, name) == 0)
return map[i].ch;
}
return L'!'; /* code meaning not found */
}
val get_spec(void)
{
return parsed_spec;
}
#ifndef YYEOF
#define YYEOF YYEMPTY
#endif
void yybadtoken(int tok, val context)
{
val problem = nil;
switch (tok) {
case ERRTOK:
return;
case SPACE: problem = lit("space"); break;
case TEXT: problem = lit("text"); break;
case IDENT: problem = lit("identifier"); break;
case KEYWORD: problem = lit("keyword"); break;
case METAVAR: problem = lit("metavar"); break;
case ALL: problem = lit("\"all\""); break;
case SOME: problem = lit("\"some\""); break;
case NONE: problem = lit("\"none\""); break;
case MAYBE: problem = lit("\"maybe\""); break;
case CASES: problem = lit("\"cases\""); break;
case CHOOSE: problem = lit("\"choose\""); break;
case AND: problem = lit("\"and\""); break;
case OR: problem = lit("\"or\""); break;
case END: problem = lit("\"end\""); break;
case COLLECT: problem = lit("\"collect\""); break;
case UNTIL: problem = lit("\"until\""); break;
case COLL: problem = lit("\"coll\""); break;
case OUTPUT: problem = lit("\"output\""); break;
case REPEAT: problem = lit("\"repeat\""); break;
case REP: problem = lit("\"rep\""); break;
case SINGLE: problem = lit("\"single\""); break;
case FIRST: problem = lit("\"first\""); break;
case LAST: problem = lit("\"last\""); break;
case EMPTY: problem = lit("\"empty\""); break;
case DEFINE: problem = lit("\"define\""); break;
case TRY: problem = lit("\"try\""); break;
case CATCH: problem = lit("\"catch\""); break;
case FINALLY: problem = lit("\"finally\""); break;
case NUMBER: problem = lit("\"number\""); break;
case REGCHAR: problem = lit("regular expression character"); break;
case LITCHAR: problem = lit("string literal character"); break;
case METAPAR: problem = lit("@("); break;
}
if (problem != 0)
if (context)
yyerrorf(lit("misplaced ~a in ~a"), problem, context, nao);
else
yyerrorf(lit("unexpected ~a"), problem, nao);
else
if (context)
if (tok == YYEOF || tok == YYEMPTY)
yyerrorf(lit("unterminated ~a"), context, nao);
else if (tok == '\n')
yyerrorf(lit("newline in ~a"), context, nao);
else
yyerrorf(lit("misplaced character ~a in ~a"), chr(tok), context, nao);
else
if (tok == YYEOF)
yyerrorf(lit("unexpected end of input"), nao);
else if (tok == YYEMPTY)
return;
else
yyerrorf(lit("unexpected ~s"), chr(tok), nao);
}