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+/*
+ Author: José Bollo <jobol@nonadev.net>
+ Author: José Bollo <jose.bollo@iot.bzh>
+
+ https://gitlab.com/jobol/mustach
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+#ifndef _mustach_h_included_
+#define _mustach_h_included_
+
+/**
+ * mustach_itf - interface for callbacks
+ *
+ * All of this function should return a negative value to stop
+ * the mustache processing. The returned negative value will be
+ * then returned to the caller of mustach as is.
+ *
+ * The functions enter and next should return 0 or 1.
+ *
+ * All other functions should normally return 0.
+ *
+ * @start: Starts the mustach processing of the closure
+ * 'start' is optional (can be NULL)
+ *
+ * @put: Writes the value of 'name' to 'file' with 'escape' or not
+ *
+ * @enter: Enters the section of 'name' if possible.
+ * Musts return 1 if entered or 0 if not entered.
+ * When 1 is returned, the function 'leave' will always be called.
+ * Conversely 'leave' is never called when enter returns 0 or
+ * a negative value.
+ * When 1 is returned, the function must activate the first
+ * item of the section.
+ *
+ * @next: Activates the next item of the section if it exists.
+ * Musts return 1 when the next item is activated.
+ * Musts return 0 when there is no item to activate.
+ *
+ * @leave: Leaves the last entered section
+ */
+struct mustach_itf {
+ int (*start)(void *closure);
+ int (*put)(void *closure, const char *name, int escape, FILE *file);
+ int (*enter)(void *closure, const char *name);
+ int (*next)(void *closure);
+ int (*leave)(void *closure);
+};
+
+#define MUSTACH_OK 0
+#define MUSTACH_ERROR_SYSTEM -1
+#define MUSTACH_ERROR_UNEXPECTED_END -2
+#define MUSTACH_ERROR_EMPTY_TAG -3
+#define MUSTACH_ERROR_TAG_TOO_LONG -4
+#define MUSTACH_ERROR_BAD_SEPARATORS -5
+#define MUSTACH_ERROR_TOO_DEPTH -6
+#define MUSTACH_ERROR_CLOSING -7
+#define MUSTACH_ERROR_BAD_UNESCAPE_TAG -8
+
+/**
+ * fmustach - Renders the mustache 'template' in 'file' for 'itf' and 'closure'.
+ *
+ * @template: the template string to instanciate
+ * @itf: the interface to the functions that mustach calls
+ * @closure: the closure to pass to functions called
+ * @file: the file where to write the result
+ *
+ * Returns 0 in case of success, -1 with errno set in case of system error
+ * a other negative value in case of error.
+ */
+extern int fmustach(const char *template, struct mustach_itf *itf, void *closure, FILE *file);
+
+/**
+ * fmustach - Renders the mustache 'template' in 'fd' for 'itf' and 'closure'.
+ *
+ * @template: the template string to instanciate
+ * @itf: the interface to the functions that mustach calls
+ * @closure: the closure to pass to functions called
+ * @fd: the file descriptor number where to write the result
+ *
+ * Returns 0 in case of success, -1 with errno set in case of system error
+ * a other negative value in case of error.
+ */
+extern int fdmustach(const char *template, struct mustach_itf *itf, void *closure, int fd);
+
+/**
+ * fmustach - Renders the mustache 'template' in 'result' for 'itf' and 'closure'.
+ *
+ * @template: the template string to instanciate
+ * @itf: the interface to the functions that mustach calls
+ * @closure: the closure to pass to functions called
+ * @result: the pointer receiving the result when 0 is returned
+ * @size: the size of the returned result
+ *
+ * Returns 0 in case of success, -1 with errno set in case of system error
+ * a other negative value in case of error.
+ */
+extern int mustach(const char *template, struct mustach_itf *itf, void *closure, char **result, size_t *size);
+
+#endif
+