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+/*
+Copyright 2015-2022 Ian Jauslin
+
+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.
+*/
+
+/*
+  parse symbolic expressions
+*/
+
+#ifndef SYMBOLIC_PARSER_H
+#define SYMBOLIC_PARSER_H
+
+#include "types.h"
+
+// parse a symbolic expression from a char_array
+int parse_symbolic_expression(Char_Array str, Fields_Table fields, Variables variables, Polynomial* polynomial);
+// from char*
+int parse_symbolic_expression_str(char* str, Fields_Table fields, Variables variables, Polynomial* polynomial);
+
+// compute the symbol tree from a string
+int char_array_to_symbol_tree(Char_Array str, Tree* symbol_tree);
+// from char*
+int str_to_symbol_tree(char* str, Tree* symbol_tree);
+
+// find matching '<' and '>'
+int matching_bracket(Char_Array str, int start);
+
+// resolve a symbol tree to its corresponding polynomial
+int resolve_symbol_tree(Tree symbol_tree, Fields_Table fields, Variables variables, Polynomial* output);
+
+#endif