Rename plugins to external

applications/external/calculator/tinyexpr.h

@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: Zlib
+/*
+ * TINYEXPR - Tiny recursive descent parser and evaluation engine in C
+ *
+ * Copyright (c) 2015-2020 Lewis Van Winkle
+ *
+ * http://CodePlea.com
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgement in the product documentation would be
+ * appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+
+#ifndef TINYEXPR_H
+#define TINYEXPR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct te_expr {
+    int type;
+    union {
+        double value;
+        const double* bound;
+        const void* function;
+    };
+    void* parameters[1];
+} te_expr;
+
+enum {
+    TE_VARIABLE = 0,
+
+    TE_FUNCTION0 = 8,
+    TE_FUNCTION1,
+    TE_FUNCTION2,
+    TE_FUNCTION3,
+    TE_FUNCTION4,
+    TE_FUNCTION5,
+    TE_FUNCTION6,
+    TE_FUNCTION7,
+
+    TE_CLOSURE0 = 16,
+    TE_CLOSURE1,
+    TE_CLOSURE2,
+    TE_CLOSURE3,
+    TE_CLOSURE4,
+    TE_CLOSURE5,
+    TE_CLOSURE6,
+    TE_CLOSURE7,
+
+    TE_FLAG_PURE = 32
+};
+
+typedef struct te_variable {
+    const char* name;
+    const void* address;
+    int type;
+    void* context;
+} te_variable;
+
+/* Parses the input expression, evaluates it, and frees it. */
+/* Returns NaN on error. */
+double te_interp(const char* expression, int* error);
+
+/* Parses the input expression and binds variables. */
+/* Returns NULL on error. */
+te_expr*
+    te_compile(const char* expression, const te_variable* variables, int var_count, int* error);
+
+/* Evaluates the expression. */
+double te_eval(const te_expr* n);
+
+/* Prints debugging information on the syntax tree. */
+void te_print(const te_expr* n);
+
+/* Frees the expression. */
+/* This is safe to call on NULL pointers. */
+void te_free(te_expr* n);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*TINYEXPR_H*/