From: DeaDDooMER <deaddoomer@deadsoftware.ru>
Date: Thu, 3 Aug 2017 14:11:28 +0000 (+0300)
Subject: Добавлена конструкция LOOP/EXIT
X-Git-Url: http://deadsoftware.ru/gitweb?a=commitdiff_plain;h=5b29102a5440d6511087356b9d9579b7501ca1ec;p=dsw-obn.git

Добавлена конструкция LOOP/EXIT
---

diff --git a/notes b/notes
index 693f32a..15aa1da 100644
--- a/notes
+++ b/notes
@@ -4,7 +4,6 @@
 - Нет типа SET
 - Нет оператора IS
 - Нет конструкции CASE
-- Нет конструкции LOOP/EXIT
 - Нет конструкции WITH
 - Нет модуля SYSTEM
 - Нет функций ASH CAP CHR ENTIER LEN LONG MAX MIN ODD ORD SHORT SIZE
diff --git a/src/oberon-internals.h b/src/oberon-internals.h
index f0a6bed..7a776d6 100644
--- a/src/oberon-internals.h
+++ b/src/oberon-internals.h
@@ -30,6 +30,8 @@ struct oberon_scope_t
 	int local;
 	oberon_object_t * parent;
 	oberon_type_t * parent_type;
+
+	gen_label_t * exit_label;
 };
 
 enum oberon_type_kind
diff --git a/src/oberon.c b/src/oberon.c
index f50f4d3..e95a9be 100644
--- a/src/oberon.c
+++ b/src/oberon.c
@@ -71,7 +71,9 @@ enum {
 	REPEAT,
 	UNTIL,
 	FOR,
-	BY
+	BY,
+	LOOP,
+	EXIT
 };
 
 // =======================================================================
@@ -165,6 +167,7 @@ oberon_open_scope(oberon_context_t * ctx)
 		scope -> local = scope -> up -> local;
 		scope -> parent = scope -> up -> parent;
 		scope -> parent_type = scope -> up -> parent_type;
+		scope -> exit_label = scope -> up -> exit_label;
 	}
 
 	ctx -> decl = scope;
@@ -437,6 +440,14 @@ oberon_read_ident(oberon_context_t * ctx)
 	{
 		ctx -> token = BY;
 	}
+	else if(strcmp(ident, "LOOP") == 0)
+	{
+		ctx -> token = LOOP;
+	}
+	else if(strcmp(ident, "EXIT") == 0)
+	{
+		ctx -> token = EXIT;
+	}
 }
 
 static void
@@ -3160,6 +3171,33 @@ oberon_statement(oberon_context_t * ctx)
 		oberon_generate_label(ctx, end);
 		oberon_assert_token(ctx, END);
 	}
+	else if(ctx -> token == LOOP)
+	{
+		gen_label_t * begin;
+		gen_label_t * end;
+
+		begin = oberon_generator_reserve_label(ctx);
+		end = oberon_generator_reserve_label(ctx);
+
+		oberon_open_scope(ctx);
+		oberon_assert_token(ctx, LOOP);
+		oberon_generate_label(ctx, begin);
+		ctx -> decl -> exit_label = end;
+		oberon_statement_seq(ctx);
+		oberon_generate_goto(ctx, begin);
+		oberon_generate_label(ctx, end);
+		oberon_assert_token(ctx, END);
+		oberon_close_scope(ctx -> decl);
+	}
+	else if(ctx -> token == EXIT)
+	{
+		oberon_assert_token(ctx, EXIT);
+		if(ctx -> decl -> exit_label == NULL)
+		{
+			oberon_error(ctx, "not in LOOP-END");
+		}
+		oberon_generate_goto(ctx, ctx -> decl -> exit_label);
+	}
 	else if(ctx -> token == RETURN)
 	{
 		oberon_assert_token(ctx, RETURN);
diff --git a/src/test.c b/src/test.c
index 42fc4ff..ebb807b 100644
--- a/src/test.c
+++ b/src/test.c
@@ -14,10 +14,10 @@ static char source_test[] =
 	""
 	"BEGIN"
 	"  Out.Open();"
-	"  len := 2 * 8;"
-	"  FOR i := 0 TO len BY 2 DO"
+	"  LOOP"
 	"    Out.String('Count '); Out.Int(i, 0); Out.Ln;"
-	"    len := len + 2;"
+	"    i := i + 1;"
+	"    IF i > 4 THEN EXIT END;"
 	"  END;"
 	"  Out.String('end'); Out.Ln;"
 	"END Test."