* All that is gold does not glitter, not all those who wander are lost.'
*/
+/* This file holds the grammar for the Perl language. If edited, you need
+ * to run regen_perly.pl, which re-creates the files perly.h, perly.tab
+ * and perly.act which are derived from this.
+ *
+ * The main job of of this grammar is to call the various newFOO()
+ * functions in op.c to build a syntax tree of OP structs.
+ * It relies on the lexer in toke.c to do the tokenizing.
+ */
+
/* Make the parser re-entrant. */
%pure_parser
%token COLONATTR
%type <ival> prog decl format startsub startanonsub startformsub
-%type <ival> progstart remember mremember '&'
+%type <ival> progstart remember mremember '&' savescope
%type <opval> block mblock lineseq line loop cond else
%type <opval> expr term subscripted scalar ary hsh arylen star amper sideff
%type <opval> argexpr nexpr texpr iexpr mexpr mnexpr mtexpr miexpr
{ $$ = block_start(FALSE); }
;
+savescope: /* NULL */ /* remember stack pos in case of error */
+ { $$ = PL_savestack_ix; }
+
/* A collection of "lines" in the program */
lineseq : /* NULL */
{ $$ = Nullop; }
| lineseq decl
{ $$ = $1; }
- | lineseq line
- { $$ = append_list(OP_LINESEQ,
- (LISTOP*)$1, (LISTOP*)$2);
+ | lineseq savescope line
+ { LEAVE_SCOPE($2);
+ $$ = append_list(OP_LINESEQ,
+ (LISTOP*)$1, (LISTOP*)$3);
PL_pad_reset_pending = TRUE;
- if ($1 && $2) PL_hints |= HINT_BLOCK_SCOPE; }
+ if ($1 && $3) PL_hints |= HINT_BLOCK_SCOPE; }
;
/* A "line" in the program */
{ $$ = newUNOP(OP_NOT, 0, scalar($2)); }
| UNIOP /* Unary op, $_ implied */
{ $$ = newOP($1, 0); }
- | UNIOP block /* eval { foo }, I *think* */
+ | UNIOP block /* eval { foo } */
{ $$ = newUNOP($1, 0, $2); }
| UNIOP term /* Unary op */
{ $$ = newUNOP($1, 0, $2); }
{ $$ = newOP($1, OPf_SPECIAL); }
| FUNC1 '(' expr ')' /* not($foo) */
{ $$ = newUNOP($1, 0, $3); }
- | PMFUNC '(' term ')' /* split (/foo/) */
- { $$ = pmruntime($1, $3, Nullop); }
- | PMFUNC '(' term ',' term ')' /* split (/foo/,$bar) */
- { $$ = pmruntime($1, $3, $5); }
+ | PMFUNC '(' argexpr ')' /* m//, s///, tr/// */
+ { $$ = pmruntime($1, $3, 1); }
| WORD
| listop
;