<?php

/**
 * Print xhprof raw data (essentially a callgraph) in a canonical style,
 * so that even if the ordering of things within the raw_data (which is
 * an associative array) changes in future implementations the output
 * remains stable.
 *
 * Also, suppress output of variable quantities (such as time, memory)
 * so that reference output of tests doesn't need any additional masking.
 *
 * @author Kannan
 */
function print_canonical($xhprof_data) {
  ksort($xhprof_data);
  foreach($xhprof_data as $func => $metrics) {
    echo str_pad($func, 40) . ":";
    ksort($metrics);
    foreach ($metrics as $name => $value) {

      // Only call counts are stable.
      // Wild card everything else. We still print
      // the metric name to ensure it was collected.
      if ($name != "ct") {
        $value = "*";
      } else {
        $value = str_pad($value, 8, " ", STR_PAD_LEFT);
      }

      echo " {$name}={$value};";
    }
    echo "\n";
  }
}