Twitter APIが返すJSONのlinkify処理

linkify.js

function h(s) {
        var map = {
                '<': '&lt;',
                '>': '&gt;',
                '&': '&amp;',
                '\'' :'&#39;',
                '"' :'&quot;'
        };
        function f(s) { return map[s]; }
        return s.replace(/<|>|&|'|"/g, f);
}

// https://gist.github.com/xendoc/4129696
function strlen(str) {
  var ret = 0;
  for (var i = 0; i < str.length; i++,ret++) {
    var upper = str.charCodeAt(i);
    var lower = str.length > (i + 1) ? str.charCodeAt(i + 1) : 0;
    if (isSurrogatePair(upper, lower)) {
      i++;
    }
  }
  return ret;
}
function substring(str, begin, end) {
  var ret = '';
  for (var i = 0, len = 0; i < str.length; i++, len++) {
    var upper = str.charCodeAt(i);
    var lower = str.length > (i + 1) ? str.charCodeAt(i + 1) : 0;
    var s = "";
    if(isSurrogatePair(upper, lower)) {
      i++;
      s = String.fromCharCode(upper, lower);
    } else {
      s = String.fromCharCode(upper);
    }
    if (begin <= len && len < end) {
      ret += s;
    }
  }
  return ret;
}
function isSurrogatePair(upper, lower) {
  return 0xD800 <= upper && upper <= 0xDBFF && 0xDC00 <= lower && lower <= 0xDFFF;
}

// https://gist.github.com/wadey/442463
/*
 * twitter-entities.js
 * This function converts a tweet with "entity" metadata 
 * from plain text to linkified HTML.
 *
 * See the documentation here: http://dev.twitter.com/pages/tweet_entities
 * Basically, add ?include_entities=true to your timeline call
 *
 * Copyright 2010, Wade Simmons
 * Licensed under the MIT license
 * http://wades.im/mons
 *
 * Requires jQuery
 */
function linkify(o) {
	var s = o['text'];
	var map = {};
	$.each(o['entities']['urls'], function (i, entry) {
		map[entry.indices[0]] = [entry.indices[1], function (s) {
			return "<a href=\""+ h(entry.expanded_url) + "\">" + h(entry.display_url) + "</a>";
		}];
	});
	$.each(o['entities']['user_mentions'], function (i, entry) {
		map[entry.indices[0]] = [entry.indices[1], function (s) {
			return "<a href=\"https://twitter.com/" + h(entry.screen_name) + "\">@" + h(entry.screen_name) + "</a>";
		}];
	});
	$.each(o['entities']['hashtags'], function (i, entry) {
		map[entry.indices[0]] = [entry.indices[1], function (s) {
			return "<a href=\"https://twitter.com/search?q=#" + h(entry.text) + "\">#" + h(entry.text) + "</a>";
		}];
	});
	if ('media' in o['entities']) {
		$.each(o['entities']['media'], function (i, entry) {
			map[entry.indices[0]] = [entry.indices[1], function (s) {
				return "<a href=\""+ h(entry.expanded_url) + "\">" + h(entry.display_url) + "</a>";
			}];
		});
	}
	var i = 0, last = 0;
	var result = '';
	for (var i=0;i<strlen(s);i++) {
		var index = map[i];
		if (index != undefined) {
			var end = index[0];
			var f = index[1];
			if (i != last) {
				result += h(substring(s, last, i));
			}
			result += f(substring(s, i, end));
			i = end - 1;
			last = end;
		}
	}
	if (i != last) {
		result += h(substring(s, last, i));
	}
	return result;
}

linkify.php

function h($value)
{
        if (is_array($value)) {
                foreach ($value as $k => $v) {
                        $value[$k] = htmlspecialchars($v, ENT_QUOTES, 'UTF-8');
                }
                return $value;
        } else {
                return htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
        }
}

// https://gist.github.com/wadey/442463
/*
 * twitter-entities.js
 * This function converts a tweet with "entity" metadata 
 * from plain text to linkified HTML.
 *
 * See the documentation here: http://dev.twitter.com/pages/tweet_entities
 * Basically, add ?include_entities=true to your timeline call
 *
 * Copyright 2010, Wade Simmons
 * Licensed under the MIT license
 * http://wades.im/mons
 *
 * Requires jQuery
 */
function linkify($o)
{
	$s = $o->text;
	$map = array();
	foreach ($o->entities->urls as $i => $entry) {
		$map[$entry->indices[0]] = [$entry->indices[1], function ($s) use ($entry) {
			return "<a href=\"" . h($entry->expanded_url) . "\">" . h($entry->display_url) . "</a>";
		}];
	}
	foreach ($o->entities->user_mentions as $i => $entry) {
		$map[$entry->indices[0]] = [$entry->indices[1], function ($s) use ($entry) {
			return "<a href=\"" . $this->get_uri('user', array('screen_name' => h($entry->screen_name))) . "\">@" . h($entry->screen_name) . "</a>";
		}];
	}
	foreach ($o->entities->hashtags as $i => $entry) {
		$map[$entry->indices[0]] = [$entry->indices[1], function ($s) use ($entry) {
			return "<a href=\"" . $this->get_uri('search', array('q' => "#" . h($entry->text))) . "\">#" . h($entry->text) . "</a>";
		}];
	}
	if (!empty($o->entities->media)) {
		foreach ($o->entities->media as $i => $entry) {
			$map[$entry->indices[0]] = [$entry->indices[1], function ($s) use ($entry) {
				return "<a href=\"" . h($entry->expanded_url) . "\">" . h($entry->display_url) . "</a>";
			}];
		}
	}
	$i = 0; $last = 0;
	$result = '';
	for ($i=0;$i<mb_strlen($s, 'UTF-8');$i++) {
		if (!empty($map[$i])) {
			$index = $map[$i];
			$end = $index[0];
			$f = $index[1];
			if ($i != $last) {
				$result .= h(mb_substr($s, $last, $i - $last, 'UTF-8'));
			}
			$result .= $f(mb_substr($s, $i, $end - $i, 'UTF-8'));
			$i = $end - 1;
			$last = $end;
		}
	}
	if ($i != $last) {
		$result .= h(mb_substr($s, $last, $i - $last, 'UTF-8'));
	}
	return $result;
}