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footnotes/includes/replacer.php

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<?php
/**
* Created by Stefan Herndler.
* User: Stefan
* Date: 15.05.14
* Time: 16:21
* Version: 1.1.1
* Since: 1.0
*/
/*
* collection of all footnotes found on the current page
* @since 1.0
*/
$g_arr_Footnotes = array();
/*
* collection of all footnotes settings
* @since 1.0-beta
*/
$g_arr_FootnotesSettings = array();
/*
* flag to know íf the user wants to have NO 'love me' slug on the current page
* @since 1.1.1
*/
$g_bool_NoLoveMeSlugOnCurrentPage = false;
/**
* register all functions needed for the replacement in the wordpress core
* @since 1.0-gamma
*/
function footnotes_RegisterReplacementFunctions()
{
/* access to the global settings collection */
global $g_arr_FootnotesSettings;
/* load footnote settings */
$g_arr_FootnotesSettings = footnotes_filter_options(FOOTNOTE_SETTINGS_CONTAINER, Class_FootnotesSettings::$a_arr_Default_Settings, false);
/* stops listening to the output and replaces the footnotes */
add_action('get_footer', 'footnotes_StopReplacing');
/* moves these contents through the replacement function */
add_filter('the_content', 'footnotes_Replacer_Content');
add_filter('the_excerpt', 'footnotes_Replacer_Excerpt');
add_filter('widget_title', 'footnotes_Replacer_WidgetTitle');
add_filter('widget_text', 'footnotes_Replacer_WidgetText');
/* adds the love and share me slug to the footer */
add_action('wp_footer', 'footnotes_LoveAndShareMe');
}
/**
* replacement action for the_excerpt
* @param string $p_str_Content
* @return string
* @since 1.0.7
*/
function footnotes_Replacer_Content($p_str_Content)
{
/* access to the global settings collection */
global $g_arr_FootnotesSettings;
/* get setting for 'display reference container position' */
$l_str_ReferenceContainerPosition = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_REFERENCE_CONTAINER_PLACE];
/* returns content */
return footnotes_replaceFootnotes($p_str_Content, $l_str_ReferenceContainerPosition == "post_end" ? true : false);
}
/**
* replacement action for the_excerpt
* @param string $p_str_Content
* @return string
* @since 1.0.7
*/
function footnotes_Replacer_Excerpt($p_str_Content)
{
/* access to the global settings collection */
global $g_arr_FootnotesSettings;
/* get setting for accepting footnotes in the excerpt and convert it to boolean */
$l_bool_SearchExcerpt = footnotes_ConvertToBool($g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_SEARCH_IN_EXCERPT]);
/* search in the excerpt only if activated */
if ($l_bool_SearchExcerpt) {
return footnotes_replaceFootnotes($p_str_Content, false);
}
/* returns content */
return $p_str_Content;
}
/**
* replacement action for widget_title
* @param string $p_str_Content
* @return string
* @since 1.0.7
*/
function footnotes_Replacer_WidgetTitle($p_str_Content)
{
/* returns content */
return $p_str_Content;
}
/**
* replacement action for widget_text
* @param string $p_str_Content
* @return string
* @since 1.0.7
*/
function footnotes_Replacer_WidgetText($p_str_Content)
{
/* access to the global settings collection */
global $g_arr_FootnotesSettings;
/* get setting for 'display reference container position' */
$l_str_ReferenceContainerPosition = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_REFERENCE_CONTAINER_PLACE];
/* returns content */
return footnotes_replaceFootnotes($p_str_Content, $l_str_ReferenceContainerPosition == "post_end" ? true : false);
}
/**
* stops buffering the output, automatically calls the ob_start() defined callback function
* replaces all footnotes in the whole buffer and outputs it
* @since 1.0
* cleared the flag in version 1.0.7
*/
function footnotes_StopReplacing()
{
/* access to the global settings collection */
global $g_arr_FootnotesSettings;
/* get setting for 'display reference container position' */
$l_str_ReferenceContainerPosition = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_REFERENCE_CONTAINER_PLACE];
if ($l_str_ReferenceContainerPosition == "footer") {
echo footnotes_OutputReferenceContainer();
}
}
/**
* outputs a link to love and share this awesome plugin
* @since 1.0-gamma
*/
function footnotes_LoveAndShareMe()
{
/* access to the global settings collection */
global $g_arr_FootnotesSettings;
global $g_bool_NoLoveMeSlugOnCurrentPage;
/*
* updated url to wordpress.org plugin page instead of the github page
* also updated the font-style and translation the string "footnotes"
* in version 1.0.6
*/
/*
* changed replacement of public plugin name to use global styling setting
* @since 1.0.7
*/
/* get setting for love and share this plugin and convert it to boolean */
$l_str_LoveMeText = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_LOVE];
/* check if the admin allows to add a link to the footer */
if (!empty($l_str_LoveMeText) && strtolower($l_str_LoveMeText) != "no" && !$g_bool_NoLoveMeSlugOnCurrentPage) {
if (strtolower($l_str_LoveMeText) == "random") {
$l_str_LoveMeText = "text-" . rand(1,3);
}
switch ($l_str_LoveMeText) {
case "text-1":
$l_str_LoveMeText = sprintf(__('I %s %s', FOOTNOTES_PLUGIN_NAME), FOOTNOTES_LOVE_SYMBOL, FOOTNOTES_PLUGIN_PUBLIC_NAME_LINKED);
break;
case "text-2":
$l_str_LoveMeText = sprintf(__('this site uses the awesome %s Plugin', FOOTNOTES_PLUGIN_NAME), FOOTNOTES_PLUGIN_PUBLIC_NAME_LINKED);
break;
case "text-3":
default:
$l_str_LoveMeText = sprintf(__('extra smooth %s', FOOTNOTES_PLUGIN_NAME), FOOTNOTES_PLUGIN_PUBLIC_NAME_LINKED);
break;
}
echo '<div style="text-align:center; color:#acacac;">' . $l_str_LoveMeText . '</div>';
}
}
/**
* replaces all footnotes in the given content
* loading settings if not happened yet since 1.0-gamma
* @since 1.0
* @param string $p_str_Content
* @param bool $p_bool_OutputReferences [default: true]
* @param bool $p_bool_ReplaceHtmlChars [ default: false]
* @return string
*/
function footnotes_replaceFootnotes($p_str_Content, $p_bool_OutputReferences = true, $p_bool_ReplaceHtmlChars = false)
{
/* access to the global settings collection */
global $g_arr_FootnotesSettings;
/* load footnote settings */
$g_arr_FootnotesSettings = footnotes_filter_options(FOOTNOTE_SETTINGS_CONTAINER, Class_FootnotesSettings::$a_arr_Default_Settings, $p_bool_ReplaceHtmlChars);
/* replace all footnotes in the content */
$p_str_Content = footnotes_getFromString($p_str_Content);
/* add the reference list if set */
if ($p_bool_OutputReferences) {
$p_str_Content = $p_str_Content . footnotes_OutputReferenceContainer();
}
/*
* checks if the user doesn't want to have a 'love me' on current page
* @since 1.1.1
*/
if (strpos($p_str_Content, FOOTNOTES_NO_SLUGME_PLUG) !== false) {
global $g_bool_NoLoveMeSlugOnCurrentPage;
$g_bool_NoLoveMeSlugOnCurrentPage = true;
$p_str_Content = str_replace(FOOTNOTES_NO_SLUGME_PLUG, "", $p_str_Content);
}
/* return the replaced content */
return $p_str_Content;
}
/**
* replace all footnotes in the given string and adds them to an array
* using a personal starting and ending tag for the footnotes since 1.0-gamma
* @since 1.0
* @param string $p_str_Content
* @return string
*/
function footnotes_getFromString($p_str_Content)
{
/* get access to the global array to store footnotes */
global $g_arr_Footnotes;
/* access to the global settings collection */
global $g_arr_FootnotesSettings;
/* contains the index for the next footnote on this page */
$l_int_FootnoteIndex = count($g_arr_Footnotes) + 1;
/* contains the starting position for the lookup of a footnote */
$l_int_PosStart = 0;
/* contains the footnote template */
$l_str_FootnoteTemplate = file_get_contents(FOOTNOTES_TEMPLATES_DIR . "footnote.html");
/* get footnote starting tag */
$l_str_StartingTag = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_PLACEHOLDER_START];
/*get footnote ending tag */
$l_str_EndingTag = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_PLACEHOLDER_END];
/*get footnote counter style */
$l_str_CounterStyle = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_COUNTER_STYLE];
if ($l_str_StartingTag == "userdefined" || $l_str_EndingTag == "userdefined") {
/* get user defined footnote starting tag */
$l_str_StartingTag = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_PLACEHOLDER_START_USERDEFINED];
/*get user defined footnote ending tag */
$l_str_EndingTag = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_PLACEHOLDER_END_USERDEFINED];
}
/* decode html special chars */
$p_str_Content = htmlspecialchars_decode($p_str_Content);
/* check for a footnote placeholder in the current page */
do {
/* get first occurence of a footnote starting tag */
$l_int_PosStart = strpos($p_str_Content, $l_str_StartingTag, $l_int_PosStart);
/* tag found */
if ($l_int_PosStart !== false) {
/* get first occurence of a footnote ending tag after the starting tag */
$l_int_PosEnd = strpos($p_str_Content, $l_str_EndingTag, $l_int_PosStart);
/* tag found */
if ($l_int_PosEnd !== false) {
/* get length of footnote text */
$l_int_Length = $l_int_PosEnd - $l_int_PosStart;
/* get text inside footnote */
$l_str_FootnoteText = substr($p_str_Content, $l_int_PosStart + strlen($l_str_StartingTag), $l_int_Length - strlen($l_str_StartingTag));
/* set replacer for the footnote */
$l_str_ReplaceText = str_replace("[[FOOTNOTE INDEX]]", footnote_convert_index($l_int_FootnoteIndex, $l_str_CounterStyle), $l_str_FootnoteTemplate);
$l_str_ReplaceText = str_replace("[[FOOTNOTE TEXT]]", $l_str_FootnoteText, $l_str_ReplaceText);
$l_str_ReplaceText = preg_replace('@[\s]{2,}@',' ',$l_str_ReplaceText);
/* replace footnote in content */
$p_str_Content = substr_replace($p_str_Content, $l_str_ReplaceText, $l_int_PosStart, $l_int_Length + strlen($l_str_EndingTag));
/* set footnote to the output box at the end */
$g_arr_Footnotes[] = $l_str_FootnoteText;
/* increase footnote index */
$l_int_FootnoteIndex++;
/* add offset to the new starting position */
$l_int_PosStart += ($l_int_PosEnd - $l_int_PosStart);
/* no ending tag found */
} else {
$l_int_PosStart++;
}
/* no starting tag found */
} else {
break;
}
} while (true);
/* return content */
return $p_str_Content;
}
/**
* looks through all footnotes that has been replaced in the current content and
* adds a reference to the footnote at the end of the content
* function to collapse the reference container since 1.0-beta
* @since 1.0
* @return string
*/
function footnotes_OutputReferenceContainer()
{
/* get access to the global array to read footnotes */
global $g_arr_Footnotes;
/* access to the global settings collection */
global $g_arr_FootnotesSettings;
/* no footnotes has been replaced on this page */
if (empty($g_arr_Footnotes)) {
/* return empty string */
return "";
}
/* get setting for combine identical footnotes and convert it to boolean */
$l_bool_CombineIdentical = footnotes_ConvertToBool($g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_COMBINE_IDENTICAL]);
/* get setting for preferences label */
$l_str_ReferencesLabel = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_REFERENCES_LABEL];
/* get setting for collapse reference footnotes and convert it to boolean */
$l_bool_CollapseReference = footnotes_ConvertToBool($g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_COLLAPSE_REFERENCES]);
/*get footnote counter style */
$l_str_CounterStyle = $g_arr_FootnotesSettings[FOOTNOTE_INPUTFIELD_COUNTER_STYLE];
/* output string, prepare it with the reference label as headline */
$l_str_Output = '<div class="footnote_container_prepare"><p><span onclick="footnote_expand_reference_container(\"\");">' . $l_str_ReferencesLabel . '</span></p></div>';
/* add a box around the footnotes */
$l_str_Output .= '<div id="' . FOOTNOTE_REFERENCES_CONTAINER_ID . '"';
/* add class to hide the references by default, if the user wants it */
if ($l_bool_CollapseReference) {
$l_str_Output .= ' class="footnote_hide_box"';
}
$l_str_Output .= '>';
/* contains the footnote template */
$l_str_FootnoteTemplate = file_get_contents(FOOTNOTES_TEMPLATES_DIR . "container.html");
/* loop through all footnotes found in the page */
for ($l_str_Index = 0; $l_str_Index < count($g_arr_Footnotes); $l_str_Index++) {
/* get footnote text */
$l_str_FootnoteText = $g_arr_Footnotes[$l_str_Index];
/* if fottnote is empty, get to the next one */
if (empty($l_str_FootnoteText)) {
continue;
}
/* get footnote index */
$l_str_FirstFootnoteIndex = ($l_str_Index + 1);
$l_str_FootnoteIndex = footnote_convert_index(($l_str_Index + 1), $l_str_CounterStyle);
/* check if it isn't the last footnote in the array */
if ($l_str_FirstFootnoteIndex < count($g_arr_Footnotes) && $l_bool_CombineIdentical) {
/* get all footnotes that I haven't passed yet */
for ($l_str_CheckIndex = $l_str_FirstFootnoteIndex; $l_str_CheckIndex < count($g_arr_Footnotes); $l_str_CheckIndex++) {
/* check if a further footnote is the same as the actual one */
if ($l_str_FootnoteText == $g_arr_Footnotes[$l_str_CheckIndex]) {
/* set the further footnote as empty so it won't be displayed later */
$g_arr_Footnotes[$l_str_CheckIndex] = "";
/* add the footnote index to the actual index */
$l_str_FootnoteIndex .= ", " . footnote_convert_index(($l_str_CheckIndex + 1), $l_str_CounterStyle);
}
}
}
/* add the footnote to the output box */
/*
* added function to convert the counter style in the reference container (bugfix for the link to the footnote) in version 1.0.6
*/
$l_str_ReplaceText = str_replace("[[FOOTNOTE INDEX SHORT]]", footnote_convert_index($l_str_FirstFootnoteIndex, $l_str_CounterStyle), $l_str_FootnoteTemplate);
$l_str_ReplaceText = str_replace("[[FOOTNOTE INDEX]]", $l_str_FootnoteIndex, $l_str_ReplaceText);
$l_str_ReplaceText = str_replace("[[FOOTNOTE TEXT]]", $l_str_FootnoteText, $l_str_ReplaceText);
$l_str_ReplaceText = preg_replace('@[\s]{2,}@',' ',$l_str_ReplaceText);
/* add the footnote container to the output */
$l_str_Output = $l_str_Output . $l_str_ReplaceText;
}
/* add closing tag for the div of the references container */
$l_str_Output = $l_str_Output . '</div>';
/* add a javascript to expand the reference container when clicking on a footnote or the reference label */
$l_str_Output .= '
<script type="text/javascript">
function footnote_expand_reference_container(p_str_ID) {
jQuery("#' . FOOTNOTE_REFERENCES_CONTAINER_ID . '").show();
if (p_str_ID.length > 0) {
jQuery(p_str_ID).focus();
}
}
</script>
';
/* free all found footnotes if reference container will be displayed */
$g_arr_Footnotes = array();
/* return the output string */
return $l_str_Output;
}