added @pragma rwpipe

changed || to |& for bidirectional piping

README.md

@@ -1350,12 +1350,16 @@ BEGIN {
 }
 ```
 
-## Positional variable expression
+### Positional variable expression
 
 There are subtle differences in handling expressions for positional variables. In Hawk, many of the ambiguity issues can be resolved by enclosing the expression in parentheses.
 
-
 | Expression   | Hawk          | AWK             |
 |--------------|---------------|-----------------|
 | `$++$++i`    | syntax error  | OK              |
 | `$(++$(++i))`| OK            | syntax error    |
+
+### Return value of getline
+
+### Others
+- `return` is allowed in `BEGIN` blocks, `END` blocks, and pattern-action blocks.

lib/fnc.c

@@ -352,12 +352,12 @@ static int fnc_close (hawk_rtx_t* rtx, const hawk_fnc_info_t* fi)
 	HAWK_ASSERT (a0 != HAWK_NULL);
 
 	name = hawk_rtx_getvaloocstr(rtx, a0, &len);
-	if (!name) return -1;
+	if (HAWK_UNLIKELY(!name)) return -1;
 
 	if (a1)
 	{
 		opt = hawk_rtx_getvaloocstr(rtx, a1, &optlen);
-		if (!opt)
+		if (HAWK_UNLIKELY(!opt))
 		{
 			hawk_rtx_freevaloocstr(rtx, a0, name);
 			return -1;
@@ -391,6 +391,19 @@ static int fnc_close (hawk_rtx_t* rtx, const hawk_fnc_info_t* fi)
 
 	if (opt)
 	{
+		/* r and w are the input and the output from the child process perspective
+		 * to and from are the intput and the output in terms of main process */
+		if (hawk_comp_oochars_oocstr(opt, optlen, HAWK_T("to"), 0) == 0)
+		{
+			optlen = 1;
+			opt[0] = 'r'; /* close the input to the pipe */
+		}
+		else if (hawk_comp_oochars_oocstr(opt, optlen, HAWK_T("from"), 0) == 0)
+		{
+			optlen = 1;
+			opt[0] = 'w'; /* close the output from the pipe */
+		}
+
 		if (optlen != 1 || (opt[0] != HAWK_T('r') && opt[0] != HAWK_T('w')))
 		{
 			n = -1;

lib/hawk.c

@@ -418,7 +418,7 @@ void hawk_clear (hawk_t* hawk)
 	hawk->parse.depth.loop = 0;
 	hawk->parse.depth.expr = 0;
 	hawk->parse.depth.incl = 0;
-	hawk->parse.pragma.trait = (hawk->opt.trait & (HAWK_IMPLICIT | HAWK_MULTILINESTR | HAWK_STRIPRECSPC | HAWK_STRIPSTRSPC)); /* implicit on if you didn't mask it off in hawk->opt.trait with hawk_setopt */
+	hawk->parse.pragma.trait = (hawk->opt.trait & (HAWK_IMPLICIT | HAWK_MULTILINESTR | HAWK_RWPIPE | HAWK_STRIPRECSPC | HAWK_STRIPSTRSPC)); /* implicit on if you didn't mask it off in hawk->opt.trait with hawk_setopt */
 	hawk->parse.pragma.rtx_stack_limit = 0;
 	hawk->parse.pragma.entry[0] = '\0';
 
@@ -549,7 +549,6 @@ int hawk_setopt (hawk_t* hawk, hawk_opt_t id, const void* value)
 		case HAWK_OPT_LOG_MAXCAPA:
 			hawk->opt.log_maxcapa = *(hawk_oow_t*)value;
 			return 0;
-
 	}
 
 	hawk_seterrnum(hawk, HAWK_NULL, HAWK_EINVAL);

lib/parse.c

@@ -69,8 +69,8 @@ enum tok_t
 	TOK_MOD_ASSN,
 	TOK_EXP_ASSN, /* ^ - exponentiation */
 	TOK_CONCAT_ASSN,
-	TOK_RS_ASSN,
+	TOK_RS_ASSN, /* >> */
-	TOK_LS_ASSN,
+	TOK_LS_ASSN, /* << */
 	TOK_BAND_ASSN,
 	TOK_BXOR_ASSN,
 	TOK_BOR_ASSN,
@@ -95,11 +95,12 @@ enum tok_t
 	TOK_DIV,
 	TOK_IDIV,
 	TOK_MOD,
-	TOK_LOR,
+	TOK_LOR, /* || */
-	TOK_LAND,
+	TOK_LAND, /* && */
-	TOK_BOR,
+	TOK_BOR, /* | */
+	TOK_PIPE_BD, /* |& - bidirectional pipe */
 	TOK_BXOR, /* ^^ - bitwise-xor */
-	TOK_BAND,
+	TOK_BAND, /* & */
 	TOK_RS,
 	TOK_LS,
 	TOK_IN,
@@ -1018,12 +1019,18 @@ static int parse_progunit (hawk_t* hawk)
 		}
 		/* NOTE: trait = is an intended assignment */
 		else if (((trait = HAWK_IMPLICIT) && hawk_comp_oochars_oocstr(name.ptr, name.len, HAWK_T("implicit"), 0) == 0) ||
-		         ((trait = HAWK_MULTILINESTR) && hawk_comp_oochars_oocstr(name.ptr, name.len, HAWK_T("multilinestr"), 0) == 0))
+		         ((trait = HAWK_MULTILINESTR) && hawk_comp_oochars_oocstr(name.ptr, name.len, HAWK_T("multilinestr"), 0) == 0) ||
+		         ((trait = HAWK_RWPIPE) && hawk_comp_oochars_oocstr(name.ptr, name.len, HAWK_T("rwpipe"), 0) == 0))
 		{
 			/* @pragma implicit on
 			 * @pragma implicit off
 			 * @pragma multilinestr on
-			 * @pragma multilinestr off */
+			 * @pragma multilinestr off
+			 * @pragma rwpipe on
+			 * @pragma rwpipe off
+			 *
+			 * The initial values of these pragmas are set in hawk_clear()
+			 */
 			hawk_oocs_t value;
 
 			if (get_token(hawk) <= -1) return -1;
@@ -1061,6 +1068,8 @@ static int parse_progunit (hawk_t* hawk)
 			 * @pragma numstrdetect on
 			 * @pragma numstrdetect off
 			 *
+			 * The initial values of these pragmas are set in hawk_clear()
+			 *
 			 * Take note the global STRIPRECSPC is available for context based change.
 			 * STRIPRECSPC takes precedence over this pragma.
 			 */
@@ -1272,7 +1281,7 @@ static int parse_progunit (hawk_t* hawk)
 				{
 					/* 'ptn' has been added to the chain.
 					 * it doesn't have to be cleared here
-					 * as hawk_clear does it */
+					 * as hawk_clear() does it */
 					/*hawk_clrpt(hawk, ptn);*/
 					return -1;
 				}
@@ -3290,7 +3299,7 @@ static hawk_nde_t* parse_print (hawk_t* hawk, const hawk_loc_t* xloc)
 	type = (hawk->ptok.type == TOK_PRINT)? HAWK_NDE_PRINT: HAWK_NDE_PRINTF;
 
 	if (!MATCH_TERMINATOR(hawk) && !MATCH(hawk,TOK_GT) &&
-	    !MATCH(hawk,TOK_RS) && !MATCH(hawk,TOK_BOR) && !MATCH(hawk,TOK_LOR))
+	    !MATCH(hawk,TOK_RS) && !MATCH(hawk,TOK_BOR) && !MATCH(hawk,TOK_PIPE_BD))
 	{
 		hawk_nde_t* args_tail;
 		hawk_nde_t* tail_prev;
@@ -3422,11 +3431,13 @@ static hawk_nde_t* parse_print (hawk_t* hawk, const hawk_loc_t* xloc)
 					HAWK_OUT_PIPE,
 					0
 				},
+				/* |& doesn't oeverlap with other binary operators.
 				{
-					HAWK_BINOP_LOR,
+					HAWK_BINOP_PIPE_BD,
 					HAWK_OUT_RWPIPE,
 					HAWK_RWPIPE
 				}
+				*/
 			};
 
 			for (i = 0; i < HAWK_COUNTOF(tab); i++)
@@ -3457,7 +3468,7 @@ static hawk_nde_t* parse_print (hawk_t* hawk, const hawk_loc_t* xloc)
 		           MATCH(hawk,TOK_RS)?        HAWK_OUT_APFILE:
 		           MATCH(hawk,TOK_BOR)?       HAWK_OUT_PIPE:
 		           ((hawk->opt.trait & HAWK_RWPIPE) &&
-		            MATCH(hawk,TOK_LOR))?    HAWK_OUT_RWPIPE:
+		            MATCH(hawk,TOK_PIPE_BD))? HAWK_OUT_RWPIPE:
 		                                      HAWK_OUT_CONSOLE;
 
 		if (out_type != HAWK_OUT_CONSOLE)
@@ -5568,7 +5579,7 @@ static hawk_nde_t* parse_primary (hawk_t* hawk, const hawk_loc_t* xloc)
 			{
 				intype = HAWK_IN_PIPE;
 			}
-			else if (MATCH(hawk,TOK_LOR) && (hawk->opt.trait & HAWK_RWPIPE))
+			else if (MATCH(hawk,TOK_PIPE_BD) && (hawk->parse.pragma.trait & HAWK_RWPIPE))
 			{
 				intype = HAWK_IN_RWPIPE;
 			}
@@ -5617,7 +5628,7 @@ static hawk_nde_t* parse_primary (hawk_t* hawk, const hawk_loc_t* xloc)
 
 			ploc = hawk->tok.loc;
 			var = parse_primary(hawk, &ploc);
-			if (var == HAWK_NULL) goto oops;
+			if (!var) goto oops;
 
 			if (!is_var(var) && var->type != HAWK_NDE_POS)
 			{
@@ -6940,6 +6951,7 @@ static int get_symbols (hawk_t* hawk, hawk_ooci_t c, hawk_tok_t* tok)
 		{ HAWK_T("<<"),  2, TOK_LS,           0 },
 		{ HAWK_T("<="),  2, TOK_LE,           0 },
 		{ HAWK_T("<"),   1, TOK_LT,           0 },
+		{ HAWK_T("|&"),  2, TOK_PIPE_BD,      0 },
 		{ HAWK_T("||"),  2, TOK_LOR,          0 },
 		{ HAWK_T("|="),  2, TOK_BOR_ASSN,     0 },
 		{ HAWK_T("|"),   1, TOK_BOR,          0 },

lib/tree.c

@@ -97,7 +97,7 @@ static const hawk_ooch_t* incop_str[] =
 static const hawk_ooch_t* getline_inop_str[] =
 {
 	HAWK_T("|"),
-	HAWK_T("||"),
+	HAWK_T("|&"),
 	HAWK_T("<"),
 	HAWK_T("")
 };
@@ -105,7 +105,7 @@ static const hawk_ooch_t* getline_inop_str[] =
 static const hawk_ooch_t* print_outop_str[] =
 {
 	HAWK_T("|"),
-	HAWK_T("||"),
+	HAWK_T("|&"),
 	HAWK_T(">"),
 	HAWK_T(">>"),
 	HAWK_T("")

t/Makefile.am

@@ -25,7 +25,8 @@ check_ERRORS = e-001.err
 EXTRA_DIST = $(check_SCRIPTS) $(check_ERRORS) tap.inc err.sh \
 	journal-toc.hawk journal-toc.in journal-toc.out journal-toc-html.out \
 	bibtex-to-html.hawk bibtex-to-html.out \
-	fs-test.hawk fs-test.in fs-test.out
+	fs-test.hawk fs-test.in fs-test.out \
+	two-way-pipe.hawk two-way-pipe.out
 
 check_PROGRAMS = t-001 t-002 t-003 t-004 t-005 t-006 t-007 t-008 t-009
 

t/Makefile.in

@@ -649,7 +649,8 @@ check_ERRORS = e-001.err
 EXTRA_DIST = $(check_SCRIPTS) $(check_ERRORS) tap.inc err.sh \
 	journal-toc.hawk journal-toc.in journal-toc.out journal-toc-html.out \
 	bibtex-to-html.hawk bibtex-to-html.out \
-	fs-test.hawk fs-test.in fs-test.out
+	fs-test.hawk fs-test.in fs-test.out \
+	two-way-pipe.hawk two-way-pipe.out
 
 t_001_SOURCES = t-001.c tap.h
 t_001_CPPFLAGS = $(CPPFLAGS_COMMON)

t/h-003.hawk

@@ -81,6 +81,7 @@ function main()
 	run_test("journal-toc", "-vHTML=1", "journal-toc", 0, "journal-toc-html");
 	run_test("bibtex-to-html", "", "journal-toc", 1, "bibtex-to-html");
 	run_test("fs-test", "", "fs-test", 0, "fs-test");
+	run_test("two-way-pipe", "", @nil, 0, "two-way-pipe");
 
 	tap_end ();
 }

t/two-way-pipe.hawk

@@ -0,0 +1,10 @@
+BEGIN {
+	cmd = "sort";
+	data = hawk::array("hello", "world", "two-way pipe", "testing");
+
+	for (i = 1; i <= length(data); i++) print data[i] |& cmd;
+	close(cmd, "to");
+
+	while ((cmd |& getline line) > 0) print line;
+	close(cmd);
+}

t/two-way-pipe.out

@@ -0,0 +1,4 @@
+hello
+testing
+two-way pipe
+world