| # ************************************************************* |
| # |
| # 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 |
| # |
| # 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. |
| # |
| # ************************************************************* |
| |
| 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 |
| |
