mirror of
https://github.com/renbaoshuo/S2OJ.git
synced 2024-11-25 18:28:41 +00:00
357 lines
14 KiB
PHP
357 lines
14 KiB
PHP
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<?php
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/**
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* Injector that auto paragraphs text in the root node based on
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* double-spacing.
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* @todo Ensure all states are unit tested, including variations as well.
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* @todo Make a graph of the flow control for this Injector.
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*/
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class HTMLPurifier_Injector_AutoParagraph extends HTMLPurifier_Injector
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{
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/**
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* @type string
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*/
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public $name = 'AutoParagraph';
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/**
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* @type array
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*/
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public $needed = array('p');
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/**
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* @return HTMLPurifier_Token_Start
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*/
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private function _pStart()
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{
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$par = new HTMLPurifier_Token_Start('p');
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$par->armor['MakeWellFormed_TagClosedError'] = true;
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return $par;
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}
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/**
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* @param HTMLPurifier_Token_Text $token
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*/
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public function handleText(&$token)
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{
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$text = $token->data;
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// Does the current parent allow <p> tags?
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if ($this->allowsElement('p')) {
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if (empty($this->currentNesting) || strpos($text, "\n\n") !== false) {
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// Note that we have differing behavior when dealing with text
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// in the anonymous root node, or a node inside the document.
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// If the text as a double-newline, the treatment is the same;
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// if it doesn't, see the next if-block if you're in the document.
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$i = $nesting = null;
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if (!$this->forwardUntilEndToken($i, $current, $nesting) && $token->is_whitespace) {
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// State 1.1: ... ^ (whitespace, then document end)
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// ----
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// This is a degenerate case
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} else {
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if (!$token->is_whitespace || $this->_isInline($current)) {
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// State 1.2: PAR1
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// ----
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// State 1.3: PAR1\n\nPAR2
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// ------------
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// State 1.4: <div>PAR1\n\nPAR2 (see State 2)
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// ------------
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$token = array($this->_pStart());
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$this->_splitText($text, $token);
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} else {
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// State 1.5: \n<hr />
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// --
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}
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}
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} else {
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// State 2: <div>PAR1... (similar to 1.4)
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// ----
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// We're in an element that allows paragraph tags, but we're not
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// sure if we're going to need them.
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if ($this->_pLookAhead()) {
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// State 2.1: <div>PAR1<b>PAR1\n\nPAR2
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// ----
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// Note: This will always be the first child, since any
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// previous inline element would have triggered this very
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// same routine, and found the double newline. One possible
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// exception would be a comment.
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$token = array($this->_pStart(), $token);
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} else {
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// State 2.2.1: <div>PAR1<div>
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// ----
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// State 2.2.2: <div>PAR1<b>PAR1</b></div>
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// ----
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}
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}
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// Is the current parent a <p> tag?
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} elseif (!empty($this->currentNesting) &&
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$this->currentNesting[count($this->currentNesting) - 1]->name == 'p') {
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// State 3.1: ...<p>PAR1
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// ----
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// State 3.2: ...<p>PAR1\n\nPAR2
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// ------------
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$token = array();
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$this->_splitText($text, $token);
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// Abort!
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} else {
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// State 4.1: ...<b>PAR1
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// ----
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// State 4.2: ...<b>PAR1\n\nPAR2
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// ------------
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}
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}
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/**
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* @param HTMLPurifier_Token $token
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*/
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public function handleElement(&$token)
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{
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// We don't have to check if we're already in a <p> tag for block
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// tokens, because the tag would have been autoclosed by MakeWellFormed.
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if ($this->allowsElement('p')) {
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if (!empty($this->currentNesting)) {
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if ($this->_isInline($token)) {
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// State 1: <div>...<b>
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// ---
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// Check if this token is adjacent to the parent token
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// (seek backwards until token isn't whitespace)
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$i = null;
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$this->backward($i, $prev);
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if (!$prev instanceof HTMLPurifier_Token_Start) {
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// Token wasn't adjacent
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if ($prev instanceof HTMLPurifier_Token_Text &&
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substr($prev->data, -2) === "\n\n"
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) {
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// State 1.1.4: <div><p>PAR1</p>\n\n<b>
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// ---
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// Quite frankly, this should be handled by splitText
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$token = array($this->_pStart(), $token);
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} else {
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// State 1.1.1: <div><p>PAR1</p><b>
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// ---
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// State 1.1.2: <div><br /><b>
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// ---
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// State 1.1.3: <div>PAR<b>
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// ---
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}
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} else {
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// State 1.2.1: <div><b>
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// ---
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// Lookahead to see if <p> is needed.
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if ($this->_pLookAhead()) {
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// State 1.3.1: <div><b>PAR1\n\nPAR2
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// ---
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$token = array($this->_pStart(), $token);
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} else {
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// State 1.3.2: <div><b>PAR1</b></div>
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// ---
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// State 1.3.3: <div><b>PAR1</b><div></div>\n\n</div>
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// ---
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}
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}
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} else {
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// State 2.3: ...<div>
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// -----
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}
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} else {
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if ($this->_isInline($token)) {
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// State 3.1: <b>
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// ---
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// This is where the {p} tag is inserted, not reflected in
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// inputTokens yet, however.
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$token = array($this->_pStart(), $token);
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} else {
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// State 3.2: <div>
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// -----
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}
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$i = null;
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if ($this->backward($i, $prev)) {
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if (!$prev instanceof HTMLPurifier_Token_Text) {
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// State 3.1.1: ...</p>{p}<b>
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// ---
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// State 3.2.1: ...</p><div>
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// -----
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if (!is_array($token)) {
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$token = array($token);
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}
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array_unshift($token, new HTMLPurifier_Token_Text("\n\n"));
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} else {
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// State 3.1.2: ...</p>\n\n{p}<b>
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// ---
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// State 3.2.2: ...</p>\n\n<div>
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// -----
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// Note: PAR<ELEM> cannot occur because PAR would have been
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// wrapped in <p> tags.
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}
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}
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}
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} else {
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// State 2.2: <ul><li>
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// ----
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// State 2.4: <p><b>
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// ---
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}
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}
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/**
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* Splits up a text in paragraph tokens and appends them
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* to the result stream that will replace the original
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* @param string $data String text data that will be processed
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* into paragraphs
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* @param HTMLPurifier_Token[] $result Reference to array of tokens that the
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* tags will be appended onto
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*/
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private function _splitText($data, &$result)
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{
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$raw_paragraphs = explode("\n\n", $data);
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$paragraphs = array(); // without empty paragraphs
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$needs_start = false;
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$needs_end = false;
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$c = count($raw_paragraphs);
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if ($c == 1) {
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// There were no double-newlines, abort quickly. In theory this
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// should never happen.
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$result[] = new HTMLPurifier_Token_Text($data);
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return;
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}
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for ($i = 0; $i < $c; $i++) {
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$par = $raw_paragraphs[$i];
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if (trim($par) !== '') {
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$paragraphs[] = $par;
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} else {
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if ($i == 0) {
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// Double newline at the front
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if (empty($result)) {
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// The empty result indicates that the AutoParagraph
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// injector did not add any start paragraph tokens.
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// This means that we have been in a paragraph for
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// a while, and the newline means we should start a new one.
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$result[] = new HTMLPurifier_Token_End('p');
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$result[] = new HTMLPurifier_Token_Text("\n\n");
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// However, the start token should only be added if
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// there is more processing to be done (i.e. there are
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// real paragraphs in here). If there are none, the
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// next start paragraph tag will be handled by the
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// next call to the injector
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$needs_start = true;
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} else {
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// We just started a new paragraph!
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// Reinstate a double-newline for presentation's sake, since
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// it was in the source code.
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array_unshift($result, new HTMLPurifier_Token_Text("\n\n"));
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}
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} elseif ($i + 1 == $c) {
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// Double newline at the end
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// There should be a trailing </p> when we're finally done.
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$needs_end = true;
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}
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}
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}
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// Check if this was just a giant blob of whitespace. Move this earlier,
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// perhaps?
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if (empty($paragraphs)) {
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return;
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}
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// Add the start tag indicated by \n\n at the beginning of $data
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if ($needs_start) {
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$result[] = $this->_pStart();
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}
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// Append the paragraphs onto the result
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foreach ($paragraphs as $par) {
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$result[] = new HTMLPurifier_Token_Text($par);
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$result[] = new HTMLPurifier_Token_End('p');
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$result[] = new HTMLPurifier_Token_Text("\n\n");
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$result[] = $this->_pStart();
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}
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// Remove trailing start token; Injector will handle this later if
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// it was indeed needed. This prevents from needing to do a lookahead,
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// at the cost of a lookbehind later.
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array_pop($result);
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// If there is no need for an end tag, remove all of it and let
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// MakeWellFormed close it later.
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if (!$needs_end) {
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array_pop($result); // removes \n\n
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array_pop($result); // removes </p>
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}
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}
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/**
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* Returns true if passed token is inline (and, ergo, allowed in
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* paragraph tags)
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* @param HTMLPurifier_Token $token
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* @return bool
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*/
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private function _isInline($token)
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{
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return isset($this->htmlDefinition->info['p']->child->elements[$token->name]);
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}
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/**
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* Looks ahead in the token list and determines whether or not we need
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* to insert a <p> tag.
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* @return bool
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*/
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private function _pLookAhead()
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{
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if ($this->currentToken instanceof HTMLPurifier_Token_Start) {
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$nesting = 1;
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} else {
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$nesting = 0;
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}
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$ok = false;
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$i = null;
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while ($this->forwardUntilEndToken($i, $current, $nesting)) {
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$result = $this->_checkNeedsP($current);
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if ($result !== null) {
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$ok = $result;
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break;
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}
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}
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return $ok;
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}
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/**
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* Determines if a particular token requires an earlier inline token
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* to get a paragraph. This should be used with _forwardUntilEndToken
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* @param HTMLPurifier_Token $current
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* @return bool
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*/
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private function _checkNeedsP($current)
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{
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if ($current instanceof HTMLPurifier_Token_Start) {
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if (!$this->_isInline($current)) {
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// <div>PAR1<div>
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// ----
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// Terminate early, since we hit a block element
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return false;
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}
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} elseif ($current instanceof HTMLPurifier_Token_Text) {
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if (strpos($current->data, "\n\n") !== false) {
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// <div>PAR1<b>PAR1\n\nPAR2
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// ----
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return true;
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} else {
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// <div>PAR1<b>PAR1...
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// ----
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}
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}
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return null;
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}
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}
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// vim: et sw=4 sts=4
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