PHP_CodeSniffer sniff file for checking for idiotic ternary assignments

SensibleTermarySniff.php

<?php
class TangentLabs_Sniffs_BestPractice_SensibleTernarysSniff implements PHP_CodeSniffer_Sniff
{
    /**
     * @return array
     */
    public function register()
    {
        return array(T_INLINE_THEN);
    }

    /**
     * @param PHP_CodeSniffer_File $phpcsFile
     * @param int $stackPtr
     * @return void
     */
    public function process(PHP_CodeSniffer_File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();
        
        // Collect non-whitespace tokens within the true condition
        $trueConditionTokens = array();
        $foundColon = false;
        $pointer = $stackPtr;
        while (!$foundColon) {
            $pointer += 1;
            if ($tokens[$pointer]['code'] == T_COLON) {
                $foundColon = true;
            } elseif ($tokens[$pointer]['code'] != T_WHITESPACE) {
                $trueConditionTokens[] = $tokens[$pointer];
            }
        }
        
        // Collect non-whitespace tokens within the false condition
        $falseConditionTokens = array();
        $foundSemiColon = false;
        while (!$foundSemiColon) {
            $pointer += 1;
            if ($tokens[$pointer]['code'] == T_SEMICOLON) {
                $foundSemiColon = true;
            } elseif ($tokens[$pointer]['code'] != T_WHITESPACE) {
                $falseConditionTokens[] = $tokens[$pointer];
            }
        }
        
        // Error if both the conditions are simple booleans
        if ($this->isTokenSetABoolean($trueConditionTokens) && 
            $this->isTokenSetABoolean($falseConditionTokens)) {
            $error = 'Don\'t use true and false in ternary assignments - it\'s redundant' ;
            $phpcsFile->addError($error, $stackPtr);
        }
    }
    
    /**
     * @param array $tokens
     * @return boolean
     */
    private function isTokenSetABoolean(array $tokens)
    {
        return count($tokens) == 1 && in_array($tokens[0]['code'], array(T_TRUE, T_FALSE));
    }
}