ARC_ntriples_serializer.php in Taxonomy import/export via XML 5.2

File

arc/ARC_ntriples_serializer.php

<?php


class ARC_ntriples_serializer {
  function ARC_ntriples_serializer($args = "") {
    $this->spacer = " ";
    $this->linebreak = "\r\n";
    if (is_array($args)) {
      foreach ($args as $k => $v) {
        $this->{$k} = $v;
      }
    }

    /* linebreak, spacer */
  }

  /*					*/
  function str2unicode_nfc($str) {
    $result = "";

    /* try to detect encoding */
    $tmp = str_replace("?", "", $str);
    if (strpos(utf8_decode($tmp), "?") === false) {
      $str = utf8_decode($str);
    }
    for ($i = 0, $i_max = strlen($str); $i < $i_max; $i++) {
      $nr = 0;

      /* unicode dec nr */

      /* char */
      $char = $str[$i];

      /* utf8 binary */
      $utf8_char = utf8_encode($char);
      $bytes = strlen($utf8_char);
      if ($bytes == 1) {

        /* 0####### (0-127) */
        $nr = ord($utf8_char);
      }
      elseif ($bytes == 2) {

        /* 110##### 10###### = 192+x 128+x */
        $nr = (ord($utf8_char[0]) - 192) * 64 + (ord($utf8_char[1]) - 128);
      }
      elseif ($bytes == 3) {

        /* 1110#### 10###### 10###### = 224+x 128+x 128+x */
        $nr = (ord($utf8_char[0]) - 224) * 4096 + (ord($utf8_char[1]) - 128) * 64 + (ord($utf8_char[2]) - 128);
      }
      elseif ($bytes == 4) {

        /* 1111#### 10###### 10###### 10###### = 240+x 128+x 128+x 128+x */
        $nr = (ord($utf8_char[0]) - 240) * 262144 + (ord($utf8_char[1]) - 128) * 4096 + (ord($utf8_char[2]) - 128) * 64 + (ord($utf8_char[3]) - 128);
      }

      /* result (see http://www.w3.org/TR/rdf-testcases/#ntrip_strings) */
      if ($nr < 9) {

        /* #x0-#x8 (0-8) */
        $result .= "\\u" . sprintf("%04X", $nr);
      }
      elseif ($nr == 9) {

        /* #x9 (9) */
        $result .= '\\t';
      }
      elseif ($nr == 10) {

        /* #xA (10) */
        $result .= '\\n';
      }
      elseif ($nr < 13) {

        /* #xB-#xC (11-12) */
        $result .= "\\u" . sprintf("%04X", $nr);
      }
      elseif ($nr == 13) {

        /* #xD (13) */
        $result .= '\\t';
      }
      elseif ($nr < 32) {

        /* #xE-#x1F (14-31) */
        $result .= "\\u" . sprintf("%04X", $nr);
      }
      elseif ($nr < 34) {

        /* #x20-#x21 (32-33) */
        $result .= $char;
      }
      elseif ($nr == 34) {

        /* #x22 (34) */
        $result .= '\\"';
      }
      elseif ($nr < 92) {

        /* #x23-#x5B (35-91) */
        $result .= $char;
      }
      elseif ($nr == 92) {

        /* #x5C (92) */
        $result .= '\\';
      }
      elseif ($nr < 127) {

        /* #x5D-#x7E (93-126) */
        $result .= $char;
      }
      elseif ($nr < 65536) {

        /* #x7F-#xFFFF (128-65535) */
        $result .= "\\u" . sprintf("%04X", $nr);
      }
      elseif ($nr < 1114112) {

        /* #x10000-#x10FFFF (65536-1114111) */
        $result .= "\\U" . sprintf("%08X", $nr);
      }
      else {

        /* other chars are not defined => ignore */
      }
    }
    return $result;
  }

  /*					*/
  function get_ntriples($triples) {
    $spacer = $this->spacer;
    $linebreak = $this->linebreak;
    $result = "";
    if (is_array($triples)) {
      for ($i = 0, $i_max = count($triples); $i < $i_max; $i++) {
        $cur_t = $triples[$i];

        /* s */
        $s = $cur_t["s"];
        $s_type = $s["type"];
        if ($s_type === "uri") {
          $result .= '<' . $this
            ->str2unicode_nfc($s["uri"]) . '>';
        }
        elseif ($s_type === "bnode") {
          $result .= $s["bnode_id"];
        }
        $result .= $spacer;

        /* p */
        $p = $cur_t["p"];
        $result .= '<' . $p . '>';
        $result .= $spacer;

        /* o */
        $o = $cur_t["o"];
        $o_type = $o["type"];
        if ($o_type === "uri") {
          $result .= '<' . $this
            ->str2unicode_nfc($o["uri"]) . '>';
        }
        elseif ($o_type === "bnode") {
          $result .= $o["bnode_id"];
        }
        elseif ($o_type === "literal") {
          $result .= '"' . $this
            ->str2unicode_nfc($o["val"]) . '"';
          if ($dt = $o["dt"]) {
            $result .= "^^<" . $dt . ">";
          }
          elseif ($lang = $o["lang"]) {
            $result .= "@" . $lang;
          }
        }
        $result .= " ." . $linebreak;
      }
    }
    return $result;
  }

}

Classes

Name	Description
ARC_ntriples_serializer