X-Git-Url: https://ocean-lang.org/code/?p=ocean;a=blobdiff_plain;f=csrc%2Foceani.mdc;h=97c195382cd8955c4e0c16e154125e5d7fa2e93b;hp=1f4805e85eb9a901571474f45051b618ca60fee6;hb=1dd9f61bbc7e8890b5407ba084793817e55fe502;hpb=20effd70ff4d91a7501dc062e60caaa9e362bed5

diff --git a/csrc/oceani.mdc b/csrc/oceani.mdc
index 1f4805e..97c1953 100644
--- a/csrc/oceani.mdc
+++ b/csrc/oceani.mdc
@@ -123,6 +123,9 @@ structures can be used.
 	#define config2context(_conf) container_of(_conf, struct parse_context, \
 		config)
 
+###### Parser: reduce
+	struct parse_context *c = config2context(config);
+
 ###### Parser: code
 
 	#include <unistd.h>
@@ -148,8 +151,8 @@ structures can be used.
 	## core functions
 
 	#include <getopt.h>
-	static char Usage[] = "Usage: oceani --trace --print --noexec --brackets"
-	                      "--section=SectionName prog.ocn\n";
+	static char Usage[] =
+		"Usage: oceani --trace --print --noexec --brackets --section=SectionName prog.ocn\n";
 	static const struct option long_options[] = {
 		{"trace",     0, NULL, 't'},
 		{"print",     0, NULL, 'p'},
@@ -168,9 +171,7 @@ structures can be used.
 		char *section = NULL;
 		struct parse_context context = {
 			.config = {
-				.ignored = (1 << TK_line_comment)
-				         | (1 << TK_block_comment)
-				         | (1 << TK_mark),
+				.ignored = (1 << TK_mark),
 				.number_chars = ".,_+- ",
 				.word_start = "_",
 				.word_cont = "_",
@@ -630,8 +631,8 @@ there are errors.
 
 ###### includes
 	#include <gmp.h>
-	#include "string.h"
-	#include "number.h"
+	#include "parse_string.h"
+	#include "parse_number.h"
 
 ###### libs
 	myLDLIBS := libnumber.o libstring.o -lgmp
@@ -1002,7 +1003,8 @@ like "if" and the code following it.
 ###### Grammar
 
 	$void
-	OpenScope -> ${ scope_push(config2context(config)); }$
+	OpenScope -> ${ scope_push(c); }$
+	ClosePara -> ${ var_block_close(c, CloseParallel); }$
 
 Each variable records a scope depth and is in one of four states:
 
@@ -1093,7 +1095,7 @@ list of in_scope names.
 
 			v = t->previous;
 			free_value(t->val);
-			if (t->min_depth == 0)
+			if (t->depth == 0)
 				// This is a global constant
 				free_exec(t->where_decl);
 			free(t);
@@ -1675,7 +1677,6 @@ make a copy of an array with controllable depth.
 		$0->array.member = $<4;
 		$0->array.vsize = NULL;
 		{
-		struct parse_context *c = config2context(config);
 		char tail[3];
 		mpq_t num;
 		if (number_parse(num, tail, $2.txt) == 0)
@@ -1698,13 +1699,12 @@ make a copy of an array with controllable depth.
 	}$
 
 	| [ IDENTIFIER ] Type ${ {
-		struct parse_context *c = config2context(config);
 		struct variable *v = var_ref(c, $2.txt);
 
 		if (!v)
-			tok_err(config2context(config), "error: name undeclared", &$2);
+			tok_err(c, "error: name undeclared", &$2);
 		else if (!v->constant)
-			tok_err(config2context(config), "error: array size must be a constant", &$2);
+			tok_err(c, "error: array size must be a constant", &$2);
 
 		$0 = calloc(1, sizeof(struct type));
 		*($0) = array_prototype;
@@ -1743,9 +1743,9 @@ make a copy of an array with controllable depth.
 
 ###### print binode cases
 	case Index:
-		print_exec(b->left, -1, 0);
+		print_exec(b->left, -1, bracket);
 		printf("[");
-		print_exec(b->right, -1, 0);
+		print_exec(b->right, -1, bracket);
 		printf("]");
 		break;
 
@@ -1929,7 +1929,7 @@ function will be needed.
 	case Xfieldref:
 	{
 		struct fieldref *f = cast(fieldref, e);
-		print_exec(f->left, -1, 0);
+		print_exec(f->left, -1, bracket);
 		printf(".%.*s", f->name.len, f->name.txt);
 		break;
 	}
@@ -1999,50 +1999,47 @@ function will be needed.
 	}
 
 ###### top level grammar
-	DeclareStruct -> struct IDENTIFIER FieldBlock ${ {
-		struct type *t =
-			add_type(config2context(config), $2.txt, &structure_prototype);
-		int cnt = 0;
-		struct fieldlist *f;
-
-		for (f = $3; f; f=f->prev)
-			cnt += 1;
-
-		t->structure.nfields = cnt;
-		t->structure.fields = calloc(cnt, sizeof(struct field));
-		f = $3;
-		while (cnt > 0) {
-			cnt -= 1;
-			t->structure.fields[cnt] = f->f;
-			f->f.init = val_prepare(Tnone);
-			f = f->prev;
-		}
-	} }$
+	DeclareStruct -> struct IDENTIFIER FieldBlock Newlines ${ {
+			struct type *t =
+				add_type(c, $2.txt, &structure_prototype);
+			int cnt = 0;
+			struct fieldlist *f;
+
+			for (f = $3; f; f=f->prev)
+				cnt += 1;
+
+			t->structure.nfields = cnt;
+			t->structure.fields = calloc(cnt, sizeof(struct field));
+			f = $3;
+			while (cnt > 0) {
+				cnt -= 1;
+				t->structure.fields[cnt] = f->f;
+				f->f.init = val_prepare(Tnone);
+				f = f->prev;
+			}
+		} }$
 
-	$void
-	Open -> {
-		| NEWLINE Open
-	Close -> }
-		| NEWLINE Close
 	$*fieldlist
-	FieldBlock -> Open FieldList Close ${ $0 = $<2; }$
-		| Open SimpleFieldList } ${ $0 = $<2; }$
-		| : FieldList  ${ $0 = $<2; }$
-
-	FieldList -> SimpleFieldList NEWLINE ${ $0 = $<1; }$
-		| FieldList SimpleFieldList NEWLINE ${
-			$2->prev = $<1;
-			$0 = $<2;
+	FieldBlock -> { IN OptNL FieldLines OUT OptNL } ${ $0 = $<FL; }$
+		| { SimpleFieldList } ${ $0 = $<SFL; }$
+		| IN OptNL FieldLines OUT ${ $0 = $<FL; }$
+		| SimpleFieldList EOL ${ $0 = $<SFL; }$
+
+	FieldLines -> SimpleFieldList Newlines ${ $0 = $<SFL; }$
+		| FieldLines SimpleFieldList Newlines ${
+			$SFL->prev = $<FL;
+			$0 = $<SFL;
 		}$
 
-	SimpleFieldList -> Field ${ $0 = $<1; }$
+	SimpleFieldList -> Field ${ $0 = $<F; }$
 		| SimpleFieldList ; Field ${
-			$3->prev = $<1;
-			$0 = $<3;
+			$F->prev = $<SFL;
+			$0 = $<F;
 		}$
 		| SimpleFieldList ; ${
-			$0 = $<1;
+			$0 = $<SFL;
 		}$
+		| ERROR ${ tok_err(c, "Syntax error in struct field", &$1); }$
 
 	Field -> IDENTIFIER : Type = Expression ${ {
 			int ok;
@@ -2053,10 +2050,10 @@ function will be needed.
 			$0->f.init = val_prepare($0->f.type);
 			do {
 				ok = 1;
-				propagate_types($<5, config2context(config), &ok, $3, 0);
+				propagate_types($<5, c, &ok, $3, 0);
 			} while (ok == 2);
 			if (!ok)
-				config2context(config)->parse_error = 1;
+				c->parse_error = 1;
 			else
 				$0->f.init = interp_exec($5);
 		} }$
@@ -2075,7 +2072,7 @@ function will be needed.
 	{
 		int i;
 
-		fprintf(f, "struct %.*s:\n", t->name.len, t->name.txt);
+		fprintf(f, "struct %.*s\n", t->name.len, t->name.txt);
 
 		for (i = 0; i < t->structure.nfields; i++) {
 			struct field *fl = t->structure.fields + i;
@@ -2159,7 +2156,7 @@ an executable.
 			if (number_parse($0->val.num, tail, $1.txt) == 0)
 				mpq_init($0->val.num);
 				if (tail[0])
-					tok_err(config2context(config), "error: unsupported number suffix",
+					tok_err(c, "error: unsupported number suffix",
 					        &$1);
 			}
 			}$
@@ -2170,7 +2167,7 @@ an executable.
 			char tail[3];
 			string_parse(&$1, '\\', &$0->val.str, tail);
 			if (tail[0])
-				tok_err(config2context(config), "error: unsupported string suffix",
+				tok_err(c, "error: unsupported string suffix",
 				        &$1);
 			}
 			}$
@@ -2181,7 +2178,7 @@ an executable.
 			char tail[3];
 			string_parse(&$1, '\\', &$0->val.str, tail);
 			if (tail[0])
-				tok_err(config2context(config), "error: unsupported string suffix",
+				tok_err(c, "error: unsupported string suffix",
 				        &$1);
 			}
 			}$
@@ -2268,38 +2265,38 @@ link to find the primary instance.
 
 	$*var
 	VariableDecl -> IDENTIFIER : ${ {
-		struct variable *v = var_decl(config2context(config), $1.txt);
+		struct variable *v = var_decl(c, $1.txt);
 		$0 = new_pos(var, $1);
 		$0->var = v;
 		if (v)
 			v->where_decl = $0;
 		else {
-			v = var_ref(config2context(config), $1.txt);
+			v = var_ref(c, $1.txt);
 			$0->var = v;
-			type_err(config2context(config), "error: variable '%v' redeclared",
+			type_err(c, "error: variable '%v' redeclared",
 			         $0, NULL, 0, NULL);
-			type_err(config2context(config), "info: this is where '%v' was first declared",
+			type_err(c, "info: this is where '%v' was first declared",
 			         v->where_decl, NULL, 0, NULL);
 		}
 	} }$
 	    | IDENTIFIER :: ${ {
-		struct variable *v = var_decl(config2context(config), $1.txt);
+		struct variable *v = var_decl(c, $1.txt);
 		$0 = new_pos(var, $1);
 		$0->var = v;
 		if (v) {
 			v->where_decl = $0;
 			v->constant = 1;
 		} else {
-			v = var_ref(config2context(config), $1.txt);
+			v = var_ref(c, $1.txt);
 			$0->var = v;
-			type_err(config2context(config), "error: variable '%v' redeclared",
+			type_err(c, "error: variable '%v' redeclared",
 			         $0, NULL, 0, NULL);
-			type_err(config2context(config), "info: this is where '%v' was first declared",
+			type_err(c, "info: this is where '%v' was first declared",
 			         v->where_decl, NULL, 0, NULL);
 		}
 	} }$
 	    | IDENTIFIER : Type ${ {
-		struct variable *v = var_decl(config2context(config), $1.txt);
+		struct variable *v = var_decl(c, $1.txt);
 		$0 = new_pos(var, $1);
 		$0->var = v;
 		if (v) {
@@ -2307,16 +2304,16 @@ link to find the primary instance.
 			v->where_set = $0;
 			v->val = val_prepare($<3);
 		} else {
-			v = var_ref(config2context(config), $1.txt);
+			v = var_ref(c, $1.txt);
 			$0->var = v;
-			type_err(config2context(config), "error: variable '%v' redeclared",
+			type_err(c, "error: variable '%v' redeclared",
 			         $0, NULL, 0, NULL);
-			type_err(config2context(config), "info: this is where '%v' was first declared",
+			type_err(c, "info: this is where '%v' was first declared",
 			         v->where_decl, NULL, 0, NULL);
 		}
 	} }$
 	    | IDENTIFIER :: Type ${ {
-		struct variable *v = var_decl(config2context(config), $1.txt);
+		struct variable *v = var_decl(c, $1.txt);
 		$0 = new_pos(var, $1);
 		$0->var = v;
 		if (v) {
@@ -2325,25 +2322,25 @@ link to find the primary instance.
 			v->val = val_prepare($<3);
 			v->constant = 1;
 		} else {
-			v = var_ref(config2context(config), $1.txt);
+			v = var_ref(c, $1.txt);
 			$0->var = v;
-			type_err(config2context(config), "error: variable '%v' redeclared",
+			type_err(c, "error: variable '%v' redeclared",
 			         $0, NULL, 0, NULL);
-			type_err(config2context(config), "info: this is where '%v' was first declared",
+			type_err(c, "info: this is where '%v' was first declared",
 			         v->where_decl, NULL, 0, NULL);
 		}
 	} }$
 
 	$*exec
 	Variable -> IDENTIFIER ${ {
-		struct variable *v = var_ref(config2context(config), $1.txt);
+		struct variable *v = var_ref(c, $1.txt);
 		$0 = new_pos(var, $1);
 		if (v == NULL) {
 			/* This might be a label - allocate a var just in case */
-			v = var_decl(config2context(config), $1.txt);
+			v = var_decl(c, $1.txt);
 			if (v) {
-				v->val = val_prepare(Tlabel);
-				v->val.label = &v->val;
+				v->val = val_prepare(Tnone);
+				v->where_decl = $0;
 				v->where_set = $0;
 			}
 		}
@@ -2353,9 +2350,9 @@ link to find the primary instance.
 
 	$*type
 	Type -> IDENTIFIER ${
-		$0 = find_type(config2context(config), $1.txt);
+		$0 = find_type(c, $1.txt);
 		if (!$0) {
-			tok_err(config2context(config),
+			tok_err(c,
 				"error: undefined type", &$1);
 
 			$0 = Tnone;
@@ -2406,6 +2403,9 @@ link to find the primary instance.
 			         v->where_decl, NULL, 0, NULL);
 			return v->val.type;
 		}
+		if (v->val.type == Tnone && v->where_decl == prog)
+			type_err(c, "error: variable used but not declared: %v",
+			         prog, NULL, 0, NULL);
 		if (v->val.type == NULL) {
 			if (type && *ok != 0) {
 				v->val = val_prepare(type);
@@ -2467,8 +2467,11 @@ room for ambiguity, so a full conditional expression is allowed in there.
 
 ###### Grammar
 
+	$LEFT if $$ifelse
+	## expr precedence
+
 	$*exec
-	Expression -> BoolExpr if Expression else Expression ${ {
+	Expression -> Expression if Expression else Expression $$ifelse ${ {
 			struct binode *b1 = new(binode);
 			struct binode *b2 = new(binode);
 			b1->op = CondExpr;
@@ -2479,17 +2482,19 @@ room for ambiguity, so a full conditional expression is allowed in there.
 			b2->right = $<5;
 			$0 = b1;
 		} }$
-		| BoolExpr ${ $0 = $<1; }$
+		## expression grammar
 
 ###### print binode cases
 
 	case CondExpr:
 		b2 = cast(binode, b->right);
-		print_exec(b2->left, -1, 0);
+		if (bracket) printf("(");
+		print_exec(b2->left, -1, bracket);
 		printf(" if ");
-		print_exec(b->left, -1, 0);
+		print_exec(b->left, -1, bracket);
 		printf(" else ");
-		print_exec(b2->right, -1, 0);
+		print_exec(b2->right, -1, bracket);
+		if (bracket) printf(")");
 		break;
 
 ###### propagate binode cases
@@ -2535,73 +2540,83 @@ if the result would make a difference.
 	OrElse,
 	Not,
 
-###### Grammar
+###### expr precedence
+	$LEFT or
+	$LEFT and
+	$LEFT not
 
-	$*exec
-	BoolExpr -> BoolExpr or BTerm ${ {
+###### expression grammar
+		| Expression or Expression ${ {
 			struct binode *b = new(binode);
 			b->op = Or;
 			b->left = $<1;
 			b->right = $<3;
 			$0 = b;
 		} }$
-		| BoolExpr or else BTerm ${ {
+		| Expression or else Expression ${ {
 			struct binode *b = new(binode);
 			b->op = OrElse;
 			b->left = $<1;
 			b->right = $<4;
 			$0 = b;
 		} }$
-		| BTerm ${ $0 = $<1; }$
 
-	BTerm -> BTerm and BFact ${ {
+		| Expression and Expression ${ {
 			struct binode *b = new(binode);
 			b->op = And;
 			b->left = $<1;
 			b->right = $<3;
 			$0 = b;
 		} }$
-		| BTerm and then BFact ${ {
+		| Expression and then Expression ${ {
 			struct binode *b = new(binode);
 			b->op = AndThen;
 			b->left = $<1;
 			b->right = $<4;
 			$0 = b;
 		} }$
-		| BFact ${ $0 = $<1; }$
 
-	BFact -> not BFact ${ {
+		| not Expression ${ {
 			struct binode *b = new(binode);
 			b->op = Not;
 			b->right = $<2;
 			$0 = b;
 		} }$
-		## other BFact
 
 ###### print binode cases
 	case And:
-		print_exec(b->left, -1, 0);
+		if (bracket) printf("(");
+		print_exec(b->left, -1, bracket);
 		printf(" and ");
-		print_exec(b->right, -1, 0);
+		print_exec(b->right, -1, bracket);
+		if (bracket) printf(")");
 		break;
 	case AndThen:
-		print_exec(b->left, -1, 0);
+		if (bracket) printf("(");
+		print_exec(b->left, -1, bracket);
 		printf(" and then ");
-		print_exec(b->right, -1, 0);
+		print_exec(b->right, -1, bracket);
+		if (bracket) printf(")");
 		break;
 	case Or:
-		print_exec(b->left, -1, 0);
+		if (bracket) printf("(");
+		print_exec(b->left, -1, bracket);
 		printf(" or ");
-		print_exec(b->right, -1, 0);
+		print_exec(b->right, -1, bracket);
+		if (bracket) printf(")");
 		break;
 	case OrElse:
-		print_exec(b->left, -1, 0);
+		if (bracket) printf("(");
+		print_exec(b->left, -1, bracket);
 		printf(" or else ");
-		print_exec(b->right, -1, 0);
+		print_exec(b->right, -1, bracket);
+		if (bracket) printf(")");
 		break;
 	case Not:
+		if (bracket) printf("(");
 		printf("not ");
-		print_exec(b->right, -1, 0);
+		print_exec(b->right, -1, bracket);
+		if (bracket) printf(")");
 		break;
 
 ###### propagate binode cases
@@ -2674,15 +2689,17 @@ expression operator.
 	Eql,
 	NEql,
 
-###### other BFact
-	| Expr CMPop Expr ${ {
+###### expr precedence
+	$LEFT < > <= >= == != CMPop
+
+###### expression grammar
+	| Expression CMPop Expression ${ {
 		struct binode *b = new(binode);
 		b->op = $2.op;
 		b->left = $<1;
 		b->right = $<3;
 		$0 = b;
 	} }$
-	| Expr ${ $0 = $<1; }$
 
 ###### Grammar
 
@@ -2702,7 +2719,8 @@ expression operator.
 	case GtrEq:
 	case Eql:
 	case NEql:
-		print_exec(b->left, -1, 0);
+		if (bracket) printf("(");
+		print_exec(b->left, -1, bracket);
 		switch(b->op) {
 		case Less:   printf(" < "); break;
 		case LessEq: printf(" <= "); break;
@@ -2712,7 +2730,8 @@ expression operator.
 		case NEql:   printf(" != "); break;
 		default: abort();		// NOTEST
 		}
-		print_exec(b->right, -1, 0);
+		print_exec(b->right, -1, bracket);
+		if (bracket) printf(")");
 		break;
 
 ###### propagate binode cases
@@ -2782,34 +2801,36 @@ precedence is handled better I might be able to discard this.
 	Absolute, Negate,
 	Bracket,
 
-###### Grammar
+###### expr precedence
+	$LEFT + - Eop
+	$LEFT * / % ++ Top
+	$LEFT Uop
+	$TERM ( )
 
-	$*exec
-	Expr -> Expr Eop Term ${ {
+###### expression grammar
+		| Expression Eop Expression ${ {
 			struct binode *b = new(binode);
 			b->op = $2.op;
 			b->left = $<1;
 			b->right = $<3;
 			$0 = b;
 		} }$
-		| Term ${ $0 = $<1; }$
 
-	Term -> Term Top Factor ${ {
+		| Expression Top Expression ${ {
 			struct binode *b = new(binode);
 			b->op = $2.op;
 			b->left = $<1;
 			b->right = $<3;
 			$0 = b;
 		} }$
-		| Factor ${ $0 = $<1; }$
 
-	Factor -> ( Expression ) ${ {
+		| ( Expression ) ${ {
 			struct binode *b = new_pos(binode, $1);
 			b->op = Bracket;
 			b->right = $<2;
 			$0 = b;
 		} }$
-		| Uop Factor ${ {
+		| Uop Expression ${ {
 			struct binode *b = new(binode);
 			b->op = $1.op;
 			b->right = $<2;
@@ -2837,7 +2858,8 @@ precedence is handled better I might be able to discard this.
 	case Divide:
 	case Concat:
 	case Rem:
-		print_exec(b->left, indent, 0);
+		if (bracket) printf("(");
+		print_exec(b->left, indent, bracket);
 		switch(b->op) {
 		case Plus:   fputs(" + ", stdout); break;
 		case Minus:  fputs(" - ", stdout); break;
@@ -2847,19 +2869,24 @@ precedence is handled better I might be able to discard this.
 		case Concat: fputs(" ++ ", stdout); break;
 		default: abort();	// NOTEST
 		}			// NOTEST
-		print_exec(b->right, indent, 0);
+		print_exec(b->right, indent, bracket);
+		if (bracket) printf(")");
 		break;
 	case Absolute:
+		if (bracket) printf("(");
 		printf("+");
-		print_exec(b->right, indent, 0);
+		print_exec(b->right, indent, bracket);
+		if (bracket) printf(")");
 		break;
 	case Negate:
+		if (bracket) printf("(");
 		printf("-");
-		print_exec(b->right, indent, 0);
+		print_exec(b->right, indent, bracket);
+		if (bracket) printf(")");
 		break;
 	case Bracket:
 		printf("(");
-		print_exec(b->right, indent, 0);
+		print_exec(b->right, indent, bracket);
 		printf(")");
 		break;
 
@@ -3015,19 +3042,35 @@ is in-place.
 ###### Binode types
 	Block,
 
-###### Grammar
+###### expr precedence
+	$TERM pass
 
-	$void
-	Newlines -> NEWLINE
-		| Newlines NEWLINE
+###### Grammar
 
 	$*binode
-	Block -> Open Statementlist Close ${ $0 = $<2; }$
-		| Open SimpleStatements } ${ $0 = reorder_bilist($<2); }$
-		| : SimpleStatements ${ $0 = reorder_bilist($<2); }$
-		| : Statementlist  ${ $0 = $<2; }$
-
-	Statementlist -> ComplexStatements ${ $0 = reorder_bilist($<1); }$
+	Block -> { IN OptNL Statementlist OUT OptNL } ${ $0 = $<Sl; }$
+		| { SimpleStatements } ${ $0 = reorder_bilist($<SS); }$
+		| SimpleStatements ; ${ $0 = reorder_bilist($<SS); }$
+		| SimpleStatements EOL ${ $0 = reorder_bilist($<SS); }$
+		| IN OptNL Statementlist OUT ${ $0 = $<Sl; }$
+
+	OpenBlock -> OpenScope { IN OptNL Statementlist OUT OptNL } ${ $0 = $<Sl; }$
+		| OpenScope { SimpleStatements } ${ $0 = reorder_bilist($<SS); }$
+		| OpenScope SimpleStatements ; ${ $0 = reorder_bilist($<SS); }$
+		| OpenScope SimpleStatements EOL ${ $0 = reorder_bilist($<SS); }$
+		| IN OpenScope OptNL Statementlist OUT ${ $0 = $<Sl; }$
+
+	UseBlock -> { OpenScope IN OptNL Statementlist OUT OptNL } ${ $0 = $<Sl; }$
+		| { OpenScope SimpleStatements } ${ $0 = reorder_bilist($<SS); }$
+		| IN OpenScope OptNL Statementlist OUT ${ $0 = $<Sl; }$
+
+	ColonBlock -> { IN OptNL Statementlist OUT OptNL } ${ $0 = $<Sl; }$
+		| { SimpleStatements } ${ $0 = reorder_bilist($<SS); }$
+		| : SimpleStatements ; ${ $0 = reorder_bilist($<SS); }$
+		| : SimpleStatements EOL ${ $0 = reorder_bilist($<SS); }$
+		| : IN OptNL Statementlist OUT ${ $0 = $<Sl; }$
+
+	Statementlist -> ComplexStatements ${ $0 = reorder_bilist($<CS); }$
 
 	ComplexStatements -> ComplexStatements ComplexStatement ${
 			if ($2 == NULL) {
@@ -3051,10 +3094,12 @@ is in-place.
 		}$
 
 	$*exec
-	ComplexStatement -> SimpleStatements NEWLINE ${
-			$0 = reorder_bilist($<1);
+	ComplexStatement -> SimpleStatements Newlines ${
+			$0 = reorder_bilist($<SS);
+			}$
+		|  SimpleStatements ; Newlines ${
+			$0 = reorder_bilist($<SS);
 			}$
-		| Newlines ${ $0 = NULL; }$
 		## ComplexStatement Grammar
 
 	$*binode
@@ -3070,9 +3115,9 @@ is in-place.
 			$0->left = NULL;
 			$0->right = $<1;
 			}$
-		| SimpleStatements ; ${ $0 = $<1; }$
 
 	SimpleStatement -> pass ${ $0 = NULL; }$
+		| ERROR ${ tok_err(c, "Syntax error in statement", &$1); }$
 		## SimpleStatement Grammar
 
 ###### print binode cases
@@ -3082,10 +3127,10 @@ is in-place.
 			if (b->left == NULL)
 				printf("pass");
 			else
-				print_exec(b->left, indent, 0);
+				print_exec(b->left, indent, bracket);
 			if (b->right) {
 				printf("; ");
-				print_exec(b->right, indent, 0);
+				print_exec(b->right, indent, bracket);
 			}
 		} else {
 			// block, one per line
@@ -3147,6 +3192,9 @@ same solution.
 ###### Binode types
 	Print,
 
+##### expr precedence
+	$TERM print ,
+
 ###### SimpleStatement Grammar
 
 	| print ExpressionList ${
@@ -3188,7 +3236,7 @@ same solution.
 		while (b) {
 			if (b->left) {
 				printf(" ");
-				print_exec(b->left, -1, 0);
+				print_exec(b->left, -1, bracket);
 				if (b->right)
 					printf(",");
 			}
@@ -3259,7 +3307,7 @@ it is declared, and error will be raised as the name is created as
 
 	| VariableDecl ${
 			if ($1->var->where_set == NULL) {
-				type_err(config2context(config),
+				type_err(c,
 				         "Variable declared with no type or value: %v",
 				         $1, NULL, 0, NULL);
 			} else {
@@ -3274,9 +3322,9 @@ it is declared, and error will be raised as the name is created as
 
 	case Assign:
 		do_indent(indent, "");
-		print_exec(b->left, indent, 0);
+		print_exec(b->left, indent, bracket);
 		printf(" = ");
-		print_exec(b->right, indent, 0);
+		print_exec(b->right, indent, bracket);
 		if (indent >= 0)
 			printf("\n");
 		break;
@@ -3285,7 +3333,7 @@ it is declared, and error will be raised as the name is created as
 		{
 		struct variable *v = cast(var, b->left)->var;
 		do_indent(indent, "");
-		print_exec(b->left, indent, 0);
+		print_exec(b->left, indent, bracket);
 		if (cast(var, b->left)->var->constant) {
 			if (v->where_decl == v->where_set) {
 				printf("::");
@@ -3303,7 +3351,7 @@ it is declared, and error will be raised as the name is created as
 		}
 		if (b->right) {
 			printf("= ");
-			print_exec(b->right, indent, 0);
+			print_exec(b->right, indent, bracket);
 		}
 		if (indent >= 0)
 			printf("\n");
@@ -3379,18 +3427,29 @@ function.
 ###### Binode types
 	Use,
 
+###### expr precedence
+	$TERM use	
+
 ###### SimpleStatement Grammar
 	| use Expression ${
 		$0 = new_pos(binode, $1);
 		$0->op = Use;
 		$0->right = $<2;
+		if ($0->right->type == Xvar) {
+			struct var *v = cast(var, $0->right);
+			if (v->var->val.type == Tnone) {
+				/* Convert this to a label */
+				v->var->val = val_prepare(Tlabel);
+				v->var->val.label = &v->var->val;
+			}
+		}
 	}$
 
 ###### print binode cases
 
 	case Use:
 		do_indent(indent, "use ");
-		print_exec(b->right, -1, 0);
+		print_exec(b->right, -1, bracket);
 		if (indent >= 0)
 			printf("\n");
 		break;
@@ -3519,157 +3578,145 @@ defined.
 ###### ComplexStatement Grammar
 	| CondStatement ${ $0 = $<1; }$
 
+###### expr precedence
+	$TERM for then while do
+	$TERM else
+	$TERM switch case
+
 ###### Grammar
 
 	$*cond_statement
-	// both ForThen and Whilepart open scopes, and CondSuffix only
+	// A CondStatement must end with EOL, as does CondSuffix and
+	// IfSuffix.
+	// ForPart, ThenPart, SwitchPart, CasePart are non-empty and
+	// may or may not end with EOL
+	// WhilePart and IfPart include an appropriate Suffix
+
+
+	// Both ForPart and Whilepart open scopes, and CondSuffix only
 	// closes one - so in the first branch here we have another to close.
-	CondStatement -> forPart ThenPart WhilePart CondSuffix ${
-			$0 = $<4;
-			$0->forpart = $<1;
-			$0->thenpart = $<2;
-			$0->condpart = $3.condpart; $3.condpart = NULL;
-			$0->dopart = $3.dopart; $3.dopart = NULL;
-			var_block_close(config2context(config), CloseSequential);
+	CondStatement -> ForPart OptNL ThenPart OptNL WhilePart CondSuffix ${
+			$0 = $<CS;
+			$0->forpart = $<FP;
+			$0->thenpart = $<TP;
+			$0->condpart = $WP.condpart; $WP.condpart = NULL;
+			$0->dopart = $WP.dopart; $WP.dopart = NULL;
+			var_block_close(c, CloseSequential);
 			}$
-		|  forPart WhilePart CondSuffix ${
-			$0 = $<3;
-			$0->forpart = $<1;
-			$0->thenpart = NULL;
-			$0->condpart = $2.condpart; $2.condpart = NULL;
-			$0->dopart = $2.dopart; $2.dopart = NULL;
-			var_block_close(config2context(config), CloseSequential);
+		| ForPart OptNL WhilePart CondSuffix ${
+			$0 = $<CS;
+			$0->forpart = $<FP;
+			$0->condpart = $WP.condpart; $WP.condpart = NULL;
+			$0->dopart = $WP.dopart; $WP.dopart = NULL;
+			var_block_close(c, CloseSequential);
 			}$
-		| whilePart CondSuffix ${
-			$0 = $<2;
-			$0->condpart = $1.condpart; $1.condpart = NULL;
-			$0->dopart = $1.dopart; $1.dopart = NULL;
+		| WhilePart CondSuffix ${
+			$0 = $<CS;
+			$0->condpart = $WP.condpart; $WP.condpart = NULL;
+			$0->dopart = $WP.dopart; $WP.dopart = NULL;
 			}$
-		| switchPart CondSuffix ${
-			$0 = $<2;
-			$0->condpart = $<1;
+		| SwitchPart OptNL CasePart CondSuffix ${
+			$0 = $<CS;
+			$0->condpart = $<SP;
+			$CP->next = $0->casepart;
+			$0->casepart = $<CP;
 			}$
-		| ifPart IfSuffix ${
-			$0 = $<2;
-			$0->condpart = $1.condpart; $1.condpart = NULL;
-			$0->thenpart = $1.thenpart; $1.thenpart = NULL;
+		| SwitchPart : IN OptNL CasePart CondSuffix OUT Newlines ${
+			$0 = $<CS;
+			$0->condpart = $<SP;
+			$CP->next = $0->casepart;
+			$0->casepart = $<CP;
+			}$
+		| IfPart IfSuffix ${
+			$0 = $<IS;
+			$0->condpart = $IP.condpart; $IP.condpart = NULL;
+			$0->thenpart = $IP.thenpart; $IP.thenpart = NULL;
 			// This is where we close an "if" statement
-			var_block_close(config2context(config), CloseSequential);
+			var_block_close(c, CloseSequential);
 			}$
 
 	CondSuffix -> IfSuffix ${
 			$0 = $<1;
 			// This is where we close scope of the whole
 			// "for" or "while" statement
-			var_block_close(config2context(config), CloseSequential);
+			var_block_close(c, CloseSequential);
+		}$
+		| Newlines CasePart CondSuffix ${
+			$0 = $<CS;
+			$CP->next = $0->casepart;
+			$0->casepart = $<CP;
 		}$
 		| CasePart CondSuffix ${
-			$0 = $<2;
-			$1->next = $0->casepart;
-			$0->casepart = $<1;
+			$0 = $<CS;
+			$CP->next = $0->casepart;
+			$0->casepart = $<CP;
 		}$
 
-	$void
-	Case -> case
-		| NEWLINE Case
-	$*casepart
-	CasePart -> Case Expression OpenScope Block ${
-			$0 = calloc(1,sizeof(struct casepart));
-			$0->value = $<2;
-			$0->action = $<4;
-			var_block_close(config2context(config), CloseParallel);
-		}$
+	IfSuffix -> Newlines ${ $0 = new(cond_statement); }$
+		| Newlines ElsePart ${ $0 = $<EP; }$
+		| ElsePart ${$0 = $<EP; }$
 
-	$*cond_statement
-	IfSuffix ->  ${ $0 = new(cond_statement); }$
-		| NEWLINE IfSuffix ${ $0 = $<2; }$
-		| else OpenScope Block ${
+	ElsePart -> else OpenBlock Newlines ${
 			$0 = new(cond_statement);
-			$0->elsepart = $<3;
-			var_block_close(config2context(config), CloseElse);
+			$0->elsepart = $<OB;
+			var_block_close(c, CloseElse);
 		}$
 		| else OpenScope CondStatement ${
 			$0 = new(cond_statement);
-			$0->elsepart = $<3;
-			var_block_close(config2context(config), CloseElse);
+			$0->elsepart = $<CS;
+			var_block_close(c, CloseElse);
 		}$
 
-	$void
-	Then -> then
-		| NEWLINE Then
-	While -> while
-		| NEWLINE While
-	Do -> do
-		| NEWLINE Do
-	$*exec
-	// These scopes are closed in CondSuffix
-	forPart -> for OpenScope SimpleStatements ${
-			$0 = reorder_bilist($<3);
-		}$
-		|  for OpenScope Block ${
-			$0 = $<3;
+	$*casepart
+	CasePart -> case Expression OpenScope ColonBlock ${
+			$0 = calloc(1,sizeof(struct casepart));
+			$0->value = $<Ex;
+			$0->action = $<Bl;
+			var_block_close(c, CloseParallel);
 		}$
 
-	ThenPart -> Then OpenScope SimpleStatements ${
-			$0 = reorder_bilist($<3);
-			var_block_close(config2context(config), CloseSequential);
-		}$
-		|  Then OpenScope Block ${
-			$0 = $<3;
-			var_block_close(config2context(config), CloseSequential);
+	$*exec
+	// These scopes are closed in CondSuffix
+	ForPart -> for OpenBlock ${
+			$0 = $<Bl;
 		}$
 
-	// This scope is closed in CondSuffix
-	WhileHead -> While OpenScope Block ${
-		$0 = $<3;
-		}$
-	whileHead -> while OpenScope Block ${
-		$0 = $<3;
+	ThenPart -> then OpenBlock ${
+			$0 = $<OB;
+			var_block_close(c, CloseSequential);
 		}$
 
 	$cond_statement
 	// This scope is closed in CondSuffix
-	whilePart -> while OpenScope Expression Block ${
-			$0.type = Xcond_statement;
-			$0.condpart = $<3;
-			$0.dopart = $<4;
-		}$
-		| whileHead Do Block ${
-			$0.type = Xcond_statement;
-			$0.condpart = $<1;
-			$0.dopart = $<3;
+	WhilePart -> while UseBlock OptNL do Block ${
+			$0.condpart = $<UB;
+			$0.dopart = $<Bl;
 		}$
-	WhilePart -> While OpenScope Expression Block ${
-			$0.type = Xcond_statement;
-			$0.condpart = $<3;
-			$0.dopart = $<4;
-		}$
-		| WhileHead Do Block ${
-			$0.type = Xcond_statement;
-			$0.condpart = $<1;
-			$0.dopart = $<3;
+		| while OpenScope Expression ColonBlock ${
+			$0.condpart = $<Exp;
+			$0.dopart = $<Bl;
 		}$
 
-	ifPart -> if OpenScope Expression OpenScope Block ${
-			$0.type = Xcond_statement;
-			$0.condpart = $<3;
-			$0.thenpart = $<5;
-			var_block_close(config2context(config), CloseParallel);
+	IfPart -> if UseBlock OptNL then OpenBlock ClosePara ${
+			$0.condpart = $<UB;
+			$0.thenpart = $<Bl;
+		}$
+		| if OpenScope Expression OpenScope ColonBlock ClosePara ${
+			$0.condpart = $<Ex;
+			$0.thenpart = $<Bl;
 		}$
-		| if OpenScope Block Then OpenScope Block ${
-			$0.type = Xcond_statement;
-			$0.condpart = $<3;
-			$0.thenpart = $<6;
-			var_block_close(config2context(config), CloseParallel);
+		| if OpenScope Expression OpenScope OptNL then Block ClosePara ${
+			$0.condpart = $<Ex;
+			$0.thenpart = $<Bl;
 		}$
 
 	$*exec
 	// This scope is closed in CondSuffix
-	switchPart -> switch OpenScope Expression ${
-			$0 = $<3;
+	SwitchPart -> switch OpenScope Expression ${
+			$0 = $<Ex;
 		}$
-		| switch OpenScope Block ${
-			$0 = $<3;
+		| switch UseBlock ${
+			$0 = $<Bl;
 		}$
 
 ###### print exec cases
@@ -3680,13 +3727,13 @@ defined.
 		struct casepart *cp;
 		if (cs->forpart) {
 			do_indent(indent, "for");
-			if (bracket) printf(" {\n"); else printf(":\n");
+			if (bracket) printf(" {\n"); else printf("\n");
 			print_exec(cs->forpart, indent+1, bracket);
 			if (cs->thenpart) {
 				if (bracket)
 					do_indent(indent, "} then {\n");
 				else
-					do_indent(indent, "then:\n");
+					do_indent(indent, "then\n");
 				print_exec(cs->thenpart, indent+1, bracket);
 			}
 			if (bracket) do_indent(indent, "}\n");
@@ -3698,12 +3745,12 @@ defined.
 				if (bracket)
 					do_indent(indent, "while {\n");
 				else
-					do_indent(indent, "while:\n");
+					do_indent(indent, "while\n");
 				print_exec(cs->condpart, indent+1, bracket);
 				if (bracket)
 					do_indent(indent, "} do {\n");
 				else
-					do_indent(indent, "do:\n");
+					do_indent(indent, "do\n");
 				print_exec(cs->dopart, indent+1, bracket);
 				if (bracket)
 					do_indent(indent, "}\n");
@@ -3768,7 +3815,7 @@ defined.
 			if (bracket)
 				printf(" {\n");
 			else
-				printf(":\n");
+				printf("\n");
 			print_exec(cs->elsepart, indent+1, bracket);
 			if (bracket)
 				do_indent(indent, "}\n");
@@ -3907,15 +3954,23 @@ various declarations in the parse context.
 ###### Parser: grammar
 
 	$void
-	Ocean -> DeclarationList
+	Ocean -> OptNL DeclarationList
+
+	OptNL ->
+		| OptNL NEWLINE
+	Newlines -> NEWLINE
+		| Newlines NEWLINE
 
 	DeclarationList -> Declaration
 		| DeclarationList Declaration
 
-	Declaration -> DeclareConstant
+	Declaration -> ERROR Newlines ${
+			tok_err(c,
+			        "error: unhandled parse error", &$1);
+		}$
+		| DeclareConstant
 		| DeclareProgram
 		| DeclareStruct
-		| NEWLINE
 
 	## top level grammar
 
@@ -3944,19 +3999,18 @@ searching through for the Nth constant for decreasing N.
 
 ###### top level grammar
 
-	DeclareConstant -> const Open ConstList Close
-		| const Open SimpleConstList }
-		| const : ConstList
-		| const SimpleConstList NEWLINE
+	DeclareConstant -> const { IN OptNL ConstList OUT OptNL } Newlines
+		| const { SimpleConstList } Newlines
+		| const IN OptNL ConstList OUT Newlines
+		| const SimpleConstList Newlines
 
-	ConstList -> ComplexConsts
-		| NEWLINE ConstList
-	ComplexConsts -> ComplexConst ComplexConsts
-		| ComplexConst
-	ComplexConst -> SimpleConstList NEWLINE
+	ConstList -> ConstList SimpleConstLine
+		| SimpleConstLine
 	SimpleConstList -> SimpleConstList ; Const
 		| Const
 		| SimpleConstList ;
+	SimpleConstLine -> SimpleConstList Newlines
+		| ERROR Newlines ${ tok_err(c, "Syntax error in constant", &$1); }$
 
 	$*type
 	CType -> Type	${ $0 = $<1; }$
@@ -3966,7 +4020,7 @@ searching through for the Nth constant for decreasing N.
 		int ok;
 		struct variable *v;
 
-		v = var_decl(config2context(config), $1.txt);
+		v = var_decl(c, $1.txt);
 		if (v) {
 			struct var *var = new_pos(var, $1);
 			v->where_decl = var;
@@ -3974,17 +4028,17 @@ searching through for the Nth constant for decreasing N.
 			var->var = v;
 			v->constant = 1;
 		} else {
-			v = var_ref(config2context(config), $1.txt);
-			tok_err(config2context(config), "error: name already declared", &$1);
-			type_err(config2context(config), "info: this is where '%v' was first declared",
+			v = var_ref(c, $1.txt);
+			tok_err(c, "error: name already declared", &$1);
+			type_err(c, "info: this is where '%v' was first declared",
 			         v->where_decl, NULL, 0, NULL);
 		}
 		do {
 			ok = 1;
-			propagate_types($5, config2context(config), &ok, $3, 0);
+			propagate_types($5, c, &ok, $3, 0);
 		} while (ok == 2);
 		if (!ok)
-			config2context(config)->parse_error = 1;
+			c->parse_error = 1;
 		else if (v) {
 			v->val = interp_exec($5);
 		}
@@ -4006,7 +4060,7 @@ searching through for the Nth constant for decreasing N.
 
 			if (target == -1) {
 				if (i)
-					printf("const:\n");
+					printf("const\n");
 				target = i;
 			} else {
 				printf("    %.*s :: ", v->name->name.len, v->name->name.txt);
@@ -4043,7 +4097,6 @@ analysis is a bit more interesting at this level.
 ###### top level grammar
 
 	DeclareProgram -> Program ${ {
-		struct parse_context *c = config2context(config);
 		if (c->prog)
 			type_err(c, "Program defined a second time",
 			         $1, NULL, 0, NULL);
@@ -4052,17 +4105,13 @@ analysis is a bit more interesting at this level.
 	} }$
 
 	$*binode
-	Program -> program OpenScope Varlist Block ${
+	Program -> program OpenScope Varlist ColonBlock Newlines ${
 		$0 = new(binode);
 		$0->op = Program;
-		$0->left = reorder_bilist($<3);
-		$0->right = $<4;
-		var_block_close(config2context(config), CloseSequential);
-		if (config2context(config)->scope_stack) abort();
-		}$
-		| ERROR ${
-			tok_err(config2context(config),
-			        "error: unhandled parse error", &$1);
+		$0->left = reorder_bilist($<Vl);
+		$0->right = $<Bl;
+		var_block_close(c, CloseSequential);
+		if (c->scope_stack && !c->parse_error) abort();
 		}$
 
 	Varlist -> Varlist ArgDecl ${
@@ -4075,7 +4124,7 @@ analysis is a bit more interesting at this level.
 
 	$*var
 	ArgDecl -> IDENTIFIER ${ {
-		struct variable *v = var_decl(config2context(config), $1.txt);
+		struct variable *v = var_decl(c, $1.txt);
 		$0 = new(var);
 		$0->var = v;
 	} }$
@@ -4184,14 +4233,14 @@ things which will likely grow as the languages grows.
 
 ###### demo: hello
 
-	const:
+	const
 		pi ::= 3.141_592_6
 		four ::= 2 + 2 ; five ::= 10/2
 	const pie ::= "I like Pie";
 		cake ::= "The cake is"
 		  ++ " a lie"
 
-	struct fred:
+	struct fred
 		size:[four]number
 		name:string
 		alive:Boolean
@@ -4206,7 +4255,7 @@ things which will likely grow as the languages grows.
 		 */
 		if A > B:
 			bigger := "yes"
-		else:
+		else
 			bigger := "no"
 		print "Is", A, "bigger than", B,"? ", bigger
 		/* If a variable is not used after the 'if', no
@@ -4215,7 +4264,7 @@ things which will likely grow as the languages grows.
 		if A > B * 2:
 			double:string = "yes"
 			print A, "is more than twice", B, "?", double
-		else:
+		else
 			double := B*2
 			print "double", B, "is", double
 
@@ -4226,15 +4275,15 @@ things which will likely grow as the languages grows.
 			while a != b:
 				if a < b:
 					b = b - a
-				else:
+				else
 					a = a - b
 			print "GCD of", A, "and", B,"is", a
 		else if a <= 0:
 			print a, "is not positive, cannot calculate GCD"
-		else:
+		else
 			print b, "is not positive, cannot calculate GCD"
 
-		for:
+		for
 			togo := 10
 			f1 := 1; f2 := 1
 			print "Fibonacci:", f1,f2,
@@ -4247,21 +4296,21 @@ things which will likely grow as the languages grows.
 		print ""
 
 		/* Binary search... */
-		for:
+		for
 			lo:= 0; hi := 100
 			target := 77
-		while:
+		while
 			mid := (lo + hi) / 2
 			if mid == target:
 				use Found
 			if mid < target:
 				lo = mid
-			else:
+			else
 				hi = mid
 			if hi - lo < 1:
 				use GiveUp
 			use True
-		do: pass
+		do pass
 		case Found:
 			print "Yay, I found", target
 		case GiveUp:
@@ -4292,6 +4341,8 @@ things which will likely grow as the languages grows.
 			print "", list[i],
 		print
 
+		if 1 == 2 then print "yes"; else print "no"
+
 		bob:fred
 		bob.name = "Hello"
 		bob.alive = (bob.name == "Hello")