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+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# This file incorporates work covered by the following license notice:
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed
+# with this work for additional information regarding copyright
+# ownership. The ASF licenses this file to you 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 .
+#
+
+Based on the C grammar for arithmetic expressions
+=================================================
+
+number_digit = '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
+
+number_exponent = 'e'|'E'
+
+basic_number = basic_number number_digit | number_digit
+
+number =
+ basic_number |
+
+ basic_number number_exponent basic_number |
+ basic_number number_exponent '-' basic_number |
+ basic_number number_exponent '+' basic_number |
+
+ '.' basic_number number_exponent basic_number |
+ '.' basic_number number_exponent '-' basic_number |
+ '.' basic_number number_exponent '+' basic_number |
+
+ basic_number '.' number_exponent basic_number |
+ basic_number '.' number_exponent '-' basic_number |
+ basic_number '.' number_exponent '+' basic_number |
+
+ basic_number '.' basic_number number_exponent basic_number |
+ basic_number '.' basic_number number_exponent '-' basic_number |
+ basic_number '.' basic_number number_exponent '+' basic_number
+
+
+identifier = '$'|'pi'|'e'|'X'|'Y'|'Width'|'Height'
+ ^ ^ ^ ^ ^
+ | | | | |
+ '$' in PPT | | | |
+ '#ppt_x' in PPT | | |
+ '#ppt_y' in PPT | |
+ '#ppt_w' in PPT |
+ '#ppt_h' in PPT
+
+unary_function = 'abs'|'sqrt'|'sin'|'cos'|'tan'|'atan'|'acos'|'asin'|'exp'|'log'
+binary_function = 'min'|'max'
+
+
+basic_expression =
+ number |
+ identifier |
+ unary_function '(' additive_expression ')' |
+ binary_function '(' additive_expression ',' additive_expression ')' |
+ '(' additive_expression ')'
+
+unary_expression = '-' basic_expression
+
+multiplicative_expression =
+ basic_expression |
+ multiplicative_expression '*' basic_expression |
+ multiplicative_expression '/' basic_expression
+
+additive_expression =
+ multiplicative_expression |
+ additive_expression '+' multiplicative_expression |
+ additive_expression '-' multiplicative_expression
+