Initial commit for Conditional Equations

a) Add a hook for equation altering
b) Create a new module for Conditional Equations feature

includes/sp-core-functions.php

@@ -1291,6 +1291,9 @@ if ( !function_exists( 'sp_get_eos_safe_slug' ) ) {
 
 if ( !function_exists( 'sp_solve' ) ) {
 	function sp_solve( $equation, $vars, $precision = 0, $default = 0 ) {
+		
+		// Add a hook to alter $equation
+		$equation = apply_filters( 'sportspress_equation_alter', $equation, $vars );
 
 		if ( $equation == null )
 			return $default;

modules/sportspress-conditional-equations.php

@@ -0,0 +1,155 @@
+<?php
+/*
+Plugin Name: SportsPress Conditional Equations
+Plugin URI: http://themeboy.com/
+Description: Add conditional equations to SportsPress.
+Author: ThemeBoy
+Author URI: http://themeboy.com/
+Version: 2.5.10
+*/
+
+// Exit if accessed directly
+if ( ! defined( 'ABSPATH' ) ) exit;
+
+if ( ! class_exists( 'SportsPress_Conditional_Equations' ) ) :
+
+/**
+ * Main SportsPress Conditional Equations Class
+ *
+ * @class SportsPress_Conditional_Equations
+ * @version	2.5.10
+ */
+ 
+ class SportsPress_Conditional_Equations {
+
+	/**
+	 * Constructor
+	 */
+	public function __construct() {
+		// Define constants
+		$this->define_constants();
+
+		// Actions
+
+		// Filters
+		add_filter( 'sportspress_equation_options', array( $this, 'add_options' ) );
+		add_filter( 'sportspress_equation_alter', array( $this, 'alter_equation' ), 10, 2 );
+
+	}
+	
+	/**
+	 * Define constants.
+	*/
+	private function define_constants() {
+		if ( !defined( 'SP_Conditional_Equations_VERSION' ) )
+			define( 'SP_Conditional_Equations_VERSION', '2.5.10' );
+
+		if ( !defined( 'SP_Conditional_Equations_URL' ) )
+			define( 'SP_Conditional_Equations_URL', plugin_dir_url( __FILE__ ) );
+
+		if ( !defined( 'SP_Conditional_Equations_DIR' ) )
+			define( 'SP_Conditional_Equations_DIR', plugin_dir_path( __FILE__ ) );
+	}
+	
+	/**
+	 * Add additional options.
+	 *
+	 * @return array
+	 */
+	public function add_options( $options ) {
+		$options[ 'Operators' ]['>'] = '&gt;';
+		$options[ 'Operators' ]['<'] = '&lt;';
+		$options[ 'Operators' ]['=='] = '&equiv;';
+		$options[ 'Operators' ]['>='] = '&ge;';
+		$options[ 'Operators' ]['<='] = '&le;';
+		return $options;
+	}
+	
+	/**
+	 * Alter.
+	 *
+	 * @return array
+	 */
+	public function alter_equation( $equation, $vars ) {
+		
+		// Remove space between equation parts
+		$equation = str_replace( ' ', '', $equation );
+		
+		// Find all parentheses with conditional operators
+		$re = '/\(([^[\(|\)]*[<=>][^[\(|\)]*)\)/';
+		if ( preg_match_all( $re, $equation, $matches ) ) {
+
+			foreach ( $matches[1] as $match ) {
+				
+				// Find which Conditional Operator is used
+				preg_match ( '/[\>\=\<]+/' ,$match, $conop );
+				$conop = $conop[0];
+				
+				//preg_match ( '/.+?(?=[\>\=\<])/' ,$match, $leftvar );
+				preg_match ( '/.+?(?='.$conop.')/' ,$match, $leftvar );
+				
+				//preg_match ( '/(?<=[\>\=\<]).*/' ,$match, $rightvar );
+				preg_match ( '/(?<='.$conop.').*/' ,$match, $rightvar );
+
+				// Check if it is a variable or a number
+				if ( strpos ( $leftvar[0], '$' ) !== FALSE ) {
+					$leftvar = str_replace ( '$', '', $leftvar[0] );
+					$leftvar = $vars[$leftvar];
+				} else {
+					$leftvar = $leftvar[0];
+				}
+				
+				// Check if it is a variable or a number
+				if ( strpos ( $rightvar[0], '$' ) !== FALSE ) {
+					$rightvar = str_replace ( '$', '', $rightvar[0] );
+					$rightvar = $vars[$rightvar];
+				} else {
+					$rightvar = $rightvar[0];
+				}
+				
+				// Select the correct conditional operator 
+				if ( $conop == '>' ){			
+					if ( $leftvar > $rightvar ) {
+						$solution = 1;
+					} else {
+						$solution = 0;
+					}
+				} elseif ( $conop == '<' ){			
+					if ( $leftvar < $rightvar ) {
+						$solution = 1;
+					} else {
+						$solution = 0;
+					}
+				} elseif ( $conop == '==' ){			
+					if ( $leftvar == $rightvar ) {
+						$solution = 1;
+					} else {
+						$solution = 0;
+					}
+				} elseif ( $conop == '>=' ){			
+					if ( $leftvar >= $rightvar ) {
+						$solution = 1;
+					} else {
+						$solution = 0;
+					}
+				} elseif ( $conop == '<=' ){			
+					if ( $leftvar <= $rightvar ) {
+						$solution = 1;
+					} else {
+						$solution = 0;
+					}
+				}
+				
+				// Replace the result of the conditional sub-equation to the equation
+				$equation = str_replace ( $match, $solution, $equation );
+			}
+			
+		}
+		return $equation;
+	}
+			
+}
+
+endif;
+
+new SportsPress_Conditional_Equations();