From 8f004e73238c5ee4be40c044827138eb5895ce88 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Fri, 21 Jul 2023 10:11:20 -0400
Subject: expr: Move some implementation into expr.c

---
 src/expr.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/expr.c

(limited to 'src/expr.c')

diff --git a/src/expr.c b/src/expr.c
new file mode 100644
index 0000000..380038c
--- /dev/null
+++ b/src/expr.c
@@ -0,0 +1,56 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include "expr.h"
+#include "alloc.h"
+#include "eval.h"
+#include "exec.h"
+#include "printf.h"
+#include "xregex.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+struct bfs_expr *bfs_expr_new(bfs_eval_fn *eval_fn, size_t argc, char **argv) {
+	struct bfs_expr *expr = ZALLOC(struct bfs_expr);
+	if (!expr) {
+		perror("zalloc()");
+		return NULL;
+	}
+
+	expr->eval_fn = eval_fn;
+	expr->argc = argc;
+	expr->argv = argv;
+	expr->probability = 0.5;
+	return expr;
+}
+
+bool bfs_expr_is_parent(const struct bfs_expr *expr) {
+	return expr->eval_fn == eval_and
+		|| expr->eval_fn == eval_or
+		|| expr->eval_fn == eval_not
+		|| expr->eval_fn == eval_comma;
+}
+
+bool bfs_expr_never_returns(const struct bfs_expr *expr) {
+	// Expressions that never return are vacuously both always true and always false
+	return expr->always_true && expr->always_false;
+}
+
+void bfs_expr_free(struct bfs_expr *expr) {
+	if (!expr) {
+		return;
+	}
+
+	if (bfs_expr_is_parent(expr)) {
+		bfs_expr_free(expr->rhs);
+		bfs_expr_free(expr->lhs);
+	} else if (expr->eval_fn == eval_exec) {
+		bfs_exec_free(expr->exec);
+	} else if (expr->eval_fn == eval_fprintf) {
+		bfs_printf_free(expr->printf);
+	} else if (expr->eval_fn == eval_regex) {
+		bfs_regfree(expr->regex);
+	}
+
+	free(expr);
+}
-- 
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