<?php
// WebSVN - Subversion repository viewing via the web using PHP
// Copyright (C) 2004-2006 Tim Armes
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// --
//
// templates.php
//
// Templating system to allow advanced page customisation

$ignore = false;

// Stack of previous test results
$ignorestack = array();

// Number of test levels currently ignored
$ignorelevel = 0;

// parseCommand
//
// Parse a special command

function parseCommand($line, $vars, $handle) {
  global $ignore, $ignorestack, $ignorelevel, $config, $listing, $vars;

  // process content of included file
  if (strncmp(trim($line), "[websvn-include:", 16) == 0) {
    if (!$ignore) {
      $line = trim($line);
      $file = substr($line, 16, -1);
      parseTemplate($config->templatePath.$file, $vars, $listing);
    }
    return true;
  }


  // Check for test conditions
  if (strncmp(trim($line), "[websvn-test:", 13) == 0) {
    if (!$ignore) {
      $line = trim($line);
      $var = substr($line, 13, -1);
      $neg = ($var{0} == '!');
      if ($neg) $var = substr($var, 1);
      if (empty($vars[$var]) xor $neg) {
        array_push($ignorestack, $ignore);
        $ignore = true;
      }
    } else {
      $ignorelevel++;
    }

    return true;
  }

  if (strncmp(trim($line), "[websvn-else]", 13) == 0) {
    if ($ignorelevel == 0) {
      $ignore = !$ignore;
    }

    return true;
  }

  if (strncmp(trim($line), "[websvn-endtest]", 16) == 0) {
    if ($ignorelevel > 0) {
      $ignorelevel--;
    } else {
      $ignore = array_pop($ignorestack);
    }

    return true;
  }

  if (strncmp(trim($line), "[websvn-getlisting]", 19) == 0) {
    global $path, $rev, $svnrep;

    if (!$ignore) {
      $svnrep->listFileContents($path, $rev);
    }

    return true;
  }

  if (strncmp(trim($line), "[websvn-defineicons]", 19) == 0) {
    global $icons;

    if (!isset($icons)) {
      $icons = array();
    }

    // Read all the lines until we reach the end of the definition, storing
    // each one...

    if (!$ignore) {
      while (!feof($handle)) {
        $line = trim(fgets($handle));

        if (strncmp($line, "[websvn-enddefineicons]", 22) == 0) {
          return true;
        }

        $eqsign = strpos($line, "=");

        $match = substr($line, 0, $eqsign);
        $def = substr($line, $eqsign + 1);

        $icons[$match] = $def;
      }
    }

    return true;
  }

  if (strncmp(trim($line), "[websvn-icon]", 13) == 0) {
    global $icons, $vars;

    if (!$ignore) {
      // The current filetype should be defined my $vars["filetype"]

      if (!empty($icons[$vars["filetype"]])) {
        echo parseTags($icons[$vars["filetype"]], $vars);
      } else if (!empty($icons["*"])) {
        echo parseTags($icons["*"], $vars);
      }
    }

    return true;
  }

  if (strncmp(trim($line), "[websvn-treenode]", 17) == 0) {
    global $icons, $vars;

    if (!$ignore) {
      if ((!empty($icons["i-node"])) && (!empty($icons["t-node"])) && (!empty($icons["l-node"]))) {
        for ($n = 1; $n < $vars["level"]; $n++) {
          if ($vars["last_i_node"][$n]) {
            echo parseTags($icons["e-node"], $vars);
          } else {
            echo parseTags($icons["i-node"], $vars);
          }
        }

        if ($vars["level"] != 0) {
          if ($vars["node"] == 0) {
            echo parseTags($icons["t-node"], $vars);
          } else {
            echo parseTags($icons["l-node"], $vars);
            $vars["last_i_node"][$vars["level"]] = TRUE;
          }
        }
      }
    }

    return true;
  }

  return false;
}

// parseTemplate
//
// Parse the given template, replacing the variables with the values passed

function parseTemplate($template, $vars, $listing) {
  global $ignore, $vars;

  if (!is_file($template)) {
    print"No template file found ($template)";
    exit;
  }

  $handle = fopen($template, "r");
  $inListing = false;
  $ignore = false;
  $listLines = array();

  while (!feof($handle)) {
    $line = fgets($handle);

    // Check for the end of the file list
    if ($inListing) {
      if (strcmp(trim($line), "[websvn-endlisting]") == 0) {
        $inListing = false;

        // For each item in the list
        foreach ($listing as $listvars) {
          // Copy the value for this list item into the $vars array
          foreach ($listvars as $id => $value) {
            $vars[$id] = $value;
          }

          // Output the list item
          foreach ($listLines as $line) {
            if (!parseCommand($line, $vars, $handle)) {
              if (!$ignore) {
                print parseTags($line, $vars);
              }
            }
          }
        }
      } else {
        if ($ignore == false) {
          $listLines[] = $line;
        }
      }
    } else if (parseCommand($line, $vars, $handle)) {
      continue;
    } else {
      // Check for the start of the file list
      if (strncmp(trim($line), "[websvn-startlisting]", 21) == 0) {
        $inListing = true;
      } else {
        if ($ignore == false) {
          print parseTags($line, $vars);
        }
      }
    }
  }

  fclose($handle);
}

// parseTags
//
// Replace all occurences of [websvn:varname] with the give variable

function parseTags($line, $vars) {
  global $lang;

  $l = '';
  // Replace the websvn variables
  while (preg_match('|\[websvn:([a-zA-Z0-9_]+)\]|', $line, $matches)) {
    // Find beginning
    $p = strpos($line, $matches[0]);

    // add everything up to beginning
    if ($p > 0) {
      $l .= substr($line, 0, $p);
    }

    // Replace variable (special token, if not exists)
    $l .= isset($vars[$matches[1]]) ? $vars[$matches[1]]: ('?'.$matches[1].'?');

    // Remove allready processed part of line
    $line = substr($line, $p + strlen($matches[0]));
  }

  // Rebuild line, add remaining part of line
  $line = $l.$line;

  // Replace the language strings
  while (preg_match('|\[lang:([a-zA-Z0-9_]+)\]|', $line, $matches)) {
    // Make sure that the variable exists
    if (!isset($lang[$matches[1]])) {
      $lang[$matches[1]] = "?${matches[1]}?";
    }

    $line = str_replace($matches[0], $lang[$matches[1]], $line);
  }

  // Return the results
  return $line;
}
