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<?php

/*

Copyright (c) 2010 Kevin M Burns Jr, http://kevburnsjr.com/

Permission is hereby granted, free of charge, to any person obtaining

a copy of this software and associated documentation files (the

"Software"), to deal in the Software without restriction, including

without limitation the rights to use, copy, modify, merge, publish,

distribute, sublicense, and/or sell copies of the Software, and to

permit persons to whom the Software is furnished to do so, subject to

the following conditions:

The above copyright notice and this permission notice shall be

included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

/**

 * A URI Template Parser which is used by the apiREST class to resolve the REST requests

 * Blogpost: http://lab.kevburnsjr.com/php-uri-template-parser

 * Source: http://github.com/KevBurnsJr/php-uri-template-parser

 */

class URI_Template_Parser {

  public static $operators = array('+', ';', '?', '/', '.');

  public static $reserved_operators = array('|', '!', '@');

  public static $explode_modifiers = array('+', '*');

  public static $partial_modifiers = array(':', '^');

  public static $gen_delims = array(':', '/', '?', '#', '[', ']', '@');

  public static $gen_delims_pct = array('%3A', '%2F', '%3F', '%23', '%5B', '%5D', '%40');

  public static $sub_delims = array('!', '$', '&', '\'', '(', ')', '*', '+', ',', ';', '=');

  public static $sub_delims_pct = array('%21', '%24', '%26', '%27', '%28', '%29', '%2A', '%2B', '%2C', '%3B', '%3D');

  public static $reserved;

  public static $reserved_pct;

  public function __construct($template) {

    self::$reserved = array_merge(self::$gen_delims, self::$sub_delims);

    self::$reserved_pct = array_merge(self::$gen_delims_pct, self::$sub_delims_pct);

    $this->template = $template;

  }

  public function expand($data) {

    // Modification to make this a bit more performant (since gettype is very slow)

    if (! is_array($data)) {

      $data = (array)$data;

    }

    /*

    // Original code, which uses a slow gettype() statement, kept in place for if the assumption that is_array always works here is incorrect

    switch (gettype($data)) {

      case "boolean":

      case "integer":

      case "double":

      case "string":

      case "object":

        $data = (array)$data;

        break;

    }

*/

    // Resolve template vars

    preg_match_all('/\{([^\}]*)\}/', $this->template, $em);

    foreach ($em[1] as $i => $bare_expression) {

      preg_match('/^([\+\;\?\/\.]{1})?(.*)$/', $bare_expression, $lm);

      $exp = new StdClass();

      $exp->expression = $em[0][$i];

      $exp->operator = $lm[1];

      $exp->variable_list = $lm[2];

      $exp->varspecs = explode(',', $exp->variable_list);

      $exp->vars = array();

      foreach ($exp->varspecs as $varspec) {

        preg_match('/^([a-zA-Z0-9_]+)([\*\+]{1})?([\:\^][0-9-]+)?(\=[^,]+)?$/', $varspec, $vm);

        $var = new StdClass();

        $var->name = $vm[1];

        $var->modifier = isset($vm[2]) && $vm[2] ? $vm[2] : null;

        $var->modifier = isset($vm[3]) && $vm[3] ? $vm[3] : $var->modifier;

        $var->default = isset($vm[4]) ? substr($vm[4], 1) : null;

        $exp->vars[] = $var;

      }

      // Add processing flags

      $exp->reserved = false;

      $exp->prefix = '';

      $exp->delimiter = ',';

      switch ($exp->operator) {

        case '+':

          $exp->reserved = 'true';

          break;

        case ';':

          $exp->prefix = ';';

          $exp->delimiter = ';';

          break;

        case '?':

          $exp->prefix = '?';

          $exp->delimiter = '&';

          break;

        case '/':

          $exp->prefix = '/';

          $exp->delimiter = '/';

          break;

        case '.':

          $exp->prefix = '.';

          $exp->delimiter = '.';

          break;

      }

      $expressions[] = $exp;

    }

    // Expansion

    $this->expansion = $this->template;

    foreach ($expressions as $exp) {

      $part = $exp->prefix;

      $exp->one_var_defined = false;

      foreach ($exp->vars as $var) {

        $val = '';

        if ($exp->one_var_defined && isset($data[$var->name])) {

          $part .= $exp->delimiter;

        }

        // Variable present

        if (isset($data[$var->name])) {

          $exp->one_var_defined = true;

          $var->data = $data[$var->name];

          $val = self::val_from_var($var, $exp);

        // Variable missing

        } else {

          if ($var->default) {

            $exp->one_var_defined = true;

            $val = $var->default;

          }

        }

        $part .= $val;

      }

      if (! $exp->one_var_defined) $part = '';

      $this->expansion = str_replace($exp->expression, $part, $this->expansion);

    }

    return $this->expansion;

  }

  private function val_from_var($var, $exp) {

    $val = '';

    if (is_array($var->data)) {

      $i = 0;

      if ($exp->operator == '?' && ! $var->modifier) {

        $val .= $var->name . '=';

      }

      foreach ($var->data as $k => $v) {

        $del = $var->modifier ? $exp->delimiter : ',';

        $ek = rawurlencode($k);

        $ev = rawurlencode($v);

        // Array

        if ($k !== $i) {

          if ($var->modifier == '+') {

            $val .= $var->name . '.';

          }

          if ($exp->operator == '?' && $var->modifier || $exp->operator == ';' && $var->modifier == '*' || $exp->operator == ';' && $var->modifier == '+') {

            $val .= $ek . '=';

          } else {

            $val .= $ek . $del;

          }

        // List

        } else {

          if ($var->modifier == '+') {

            if ($exp->operator == ';' && $var->modifier == '*' || $exp->operator == ';' && $var->modifier == '+' || $exp->operator == '?' && $var->modifier == '+') {

              $val .= $var->name . '=';

            } else {

              $val .= $var->name . '.';

            }

          }

        }

        $val .= $ev . $del;

        $i ++;

      }

      $val = trim($val, $del);

    // Strings, numbers, etc.

    } else {

      if ($exp->operator == '?') {

        $val = $var->name . (isset($var->data) ? '=' : '');

      } else if ($exp->operator == ';') {

        $val = $var->name . ($var->data ? '=' : '');

      }

      $val .= rawurlencode($var->data);

      if ($exp->operator == '+') {

        $val = str_replace(self::$reserved_pct, self::$reserved, $val);

      }

    }

    return $val;

  }

  public function match($uri) {}

  public function __toString() {

    return $this->template;

  }

}