parse: implement parsing of {...} statement blocks

bshell/parse/syntax/block.c

@@ -0,0 +1,30 @@
+#include "../syntax.h"
+
+bool parse_block(struct parse_ctx *ctx, struct ast_node **out)
+{
+	if (!parse_symbol(ctx, SYM_LEFT_BRACE)) {
+		return false;
+	}
+
+	struct block_ast_node *block
+		= (struct block_ast_node *)ast_node_create(AST_BLOCK);
+
+	while (1) {
+		parse_linefeed(ctx);
+
+		if (parse_symbol(ctx, SYM_RIGHT_BRACE)) {
+			break;
+		}
+
+		struct ast_node *stmt = NULL;
+		if (!parse_statement(ctx, &stmt)) {
+			ast_node_destroy((struct ast_node *)block);
+			return false;
+		}
+
+		fx_queue_push_back(&block->n_statements, &stmt->n_entry);
+	}
+
+	*out = (struct ast_node *)block;
+	return true;
+}