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354 lines
8.5 KiB
354 lines
8.5 KiB
4 years ago
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<?php
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/*
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Copyright (c) 2009-2019 F3::Factory/Bong Cosca, All rights reserved.
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This file is part of the Fat-Free Framework (http://fatfreeframework.com).
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This is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or later.
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Fat-Free Framework is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with Fat-Free Framework. If not, see <http://www.gnu.org/licenses/>.
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*/
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//! XML-style template engine
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class Template extends Preview {
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//@{ Error messages
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const
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E_Method='Call to undefined method %s()';
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//@}
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protected
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//! Template tags
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$tags,
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//! Custom tag handlers
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$custom=[];
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/**
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* Template -set- tag handler
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* @return string
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* @param $node array
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**/
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protected function _set(array $node) {
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$out='';
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foreach ($node['@attrib'] as $key=>$val)
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$out.='$'.$key.'='.
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(preg_match('/\{\{(.+?)\}\}/',$val)?
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$this->token($val):
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Base::instance()->stringify($val)).'; ';
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return '<?php '.$out.'?>';
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}
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/**
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* Template -include- tag handler
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* @return string
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* @param $node array
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**/
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protected function _include(array $node) {
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$attrib=$node['@attrib'];
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$hive=isset($attrib['with']) &&
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($attrib['with']=$this->token($attrib['with'])) &&
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preg_match_all('/(\w+)\h*=\h*(.+?)(?=,|$)/',
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$attrib['with'],$pairs,PREG_SET_ORDER)?
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('['.implode(',',
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array_map(function($pair) {
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return '\''.$pair[1].'\'=>'.
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(preg_match('/^\'.*\'$/',$pair[2]) ||
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preg_match('/\$/',$pair[2])?
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$pair[2]:Base::instance()->stringify(
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Base::instance()->cast($pair[2])));
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},$pairs)).']+get_defined_vars()'):
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'get_defined_vars()';
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$ttl=isset($attrib['ttl'])?(int)$attrib['ttl']:0;
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return
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'<?php '.(isset($attrib['if'])?
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('if ('.$this->token($attrib['if']).') '):'').
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('echo $this->render('.
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(preg_match('/^\{\{(.+?)\}\}$/',$attrib['href'])?
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$this->token($attrib['href']):
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Base::instance()->stringify($attrib['href'])).','.
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'NULL,'.$hive.','.$ttl.'); ?>');
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}
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/**
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* Template -exclude- tag handler
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* @return string
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**/
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protected function _exclude() {
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return '';
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}
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/**
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* Template -ignore- tag handler
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* @return string
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* @param $node array
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**/
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protected function _ignore(array $node) {
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return $node[0];
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}
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/**
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* Template -loop- tag handler
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* @return string
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* @param $node array
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**/
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protected function _loop(array $node) {
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$attrib=$node['@attrib'];
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unset($node['@attrib']);
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return
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'<?php for ('.
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$this->token($attrib['from']).';'.
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$this->token($attrib['to']).';'.
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$this->token($attrib['step']).'): ?>'.
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$this->build($node).
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'<?php endfor; ?>';
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}
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/**
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* Template -repeat- tag handler
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* @return string
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* @param $node array
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**/
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protected function _repeat(array $node) {
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$attrib=$node['@attrib'];
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unset($node['@attrib']);
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return
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'<?php '.
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(isset($attrib['counter'])?
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(($ctr=$this->token($attrib['counter'])).'=0; '):'').
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'foreach (('.
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$this->token($attrib['group']).'?:[]) as '.
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(isset($attrib['key'])?
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($this->token($attrib['key']).'=>'):'').
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$this->token($attrib['value']).'):'.
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(isset($ctr)?(' '.$ctr.'++;'):'').' ?>'.
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$this->build($node).
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'<?php endforeach; ?>';
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}
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/**
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* Template -check- tag handler
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* @return string
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* @param $node array
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**/
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protected function _check(array $node) {
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$attrib=$node['@attrib'];
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unset($node['@attrib']);
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// Grab <true> and <false> blocks
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foreach ($node as $pos=>$block)
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if (isset($block['true']))
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$true=[$pos,$block];
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elseif (isset($block['false']))
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$false=[$pos,$block];
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if (isset($true,$false) && $true[0]>$false[0])
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// Reverse <true> and <false> blocks
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list($node[$true[0]],$node[$false[0]])=[$false[1],$true[1]];
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return
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'<?php if ('.$this->token($attrib['if']).'): ?>'.
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$this->build($node).
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'<?php endif; ?>';
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}
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/**
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* Template -true- tag handler
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* @return string
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* @param $node array
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**/
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protected function _true(array $node) {
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return $this->build($node);
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}
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/**
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* Template -false- tag handler
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* @return string
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* @param $node array
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**/
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protected function _false(array $node) {
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return '<?php else: ?>'.$this->build($node);
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}
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/**
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* Template -switch- tag handler
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* @return string
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* @param $node array
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**/
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protected function _switch(array $node) {
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$attrib=$node['@attrib'];
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unset($node['@attrib']);
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foreach ($node as $pos=>$block)
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if (is_string($block) && !preg_replace('/\s+/','',$block))
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unset($node[$pos]);
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return
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'<?php switch ('.$this->token($attrib['expr']).'): ?>'.
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$this->build($node).
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'<?php endswitch; ?>';
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}
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/**
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* Template -case- tag handler
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* @return string
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* @param $node array
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**/
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protected function _case(array $node) {
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$attrib=$node['@attrib'];
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unset($node['@attrib']);
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return
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'<?php case '.(preg_match('/\{\{(.+?)\}\}/',$attrib['value'])?
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$this->token($attrib['value']):
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Base::instance()->stringify($attrib['value'])).': ?>'.
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$this->build($node).
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'<?php '.(isset($attrib['break'])?
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'if ('.$this->token($attrib['break']).') ':'').
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'break; ?>';
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}
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/**
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* Template -default- tag handler
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* @return string
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* @param $node array
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**/
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protected function _default(array $node) {
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return
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'<?php default: ?>'.
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$this->build($node).
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'<?php break; ?>';
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}
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/**
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* Assemble markup
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* @return string
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* @param $node array|string
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**/
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function build($node) {
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if (is_string($node))
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return parent::build($node);
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$out='';
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foreach ($node as $key=>$val)
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$out.=is_int($key)?$this->build($val):$this->{'_'.$key}($val);
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return $out;
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}
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/**
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* Extend template with custom tag
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* @return NULL
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* @param $tag string
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* @param $func callback
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**/
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function extend($tag,$func) {
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$this->tags.='|'.$tag;
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$this->custom['_'.$tag]=$func;
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}
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/**
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* Call custom tag handler
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* @return string|FALSE
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* @param $func string
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* @param $args array
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**/
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function __call($func,array $args) {
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if ($func[0]=='_')
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return call_user_func_array($this->custom[$func],$args);
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if (method_exists($this,$func))
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return call_user_func_array([$this,$func],$args);
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user_error(sprintf(self::E_Method,$func),E_USER_ERROR);
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}
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/**
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* Parse string for template directives and tokens
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* @return array
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* @param $text string
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**/
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function parse($text) {
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$text=parent::parse($text);
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// Build tree structure
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for ($ptr=0,$w=5,$len=strlen($text),$tree=[],$tmp='';$ptr<$len;)
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if (preg_match('/^(.{0,'.$w.'}?)<(\/?)(?:F3:)?'.
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'('.$this->tags.')\b((?:\s+[\w.:@!-]+'.
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'(?:\h*=\h*(?:"(?:.*?)"|\'(?:.*?)\'))?|'.
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'\h*\{\{.+?\}\})*)\h*(\/?)>/is',
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substr($text,$ptr),$match)) {
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if (strlen($tmp) || $match[1])
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$tree[]=$tmp.$match[1];
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// Element node
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if ($match[2]) {
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// Find matching start tag
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$stack=[];
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for($i=count($tree)-1;$i>=0;$i--) {
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$item=$tree[$i];
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if (is_array($item) &&
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array_key_exists($match[3],$item) &&
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!isset($item[$match[3]][0])) {
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// Start tag found
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$tree[$i][$match[3]]+=array_reverse($stack);
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$tree=array_slice($tree,0,$i+1);
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break;
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}
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else $stack[]=$item;
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}
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}
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else {
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// Start tag
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$node=&$tree[][$match[3]];
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$node=[];
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if ($match[4]) {
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// Process attributes
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preg_match_all(
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'/(?:(\{\{.+?\}\})|([^\s\/"\'=]+))'.
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'\h*(?:=\h*(?:"(.*?)"|\'(.*?)\'))?/s',
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$match[4],$attr,PREG_SET_ORDER);
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foreach ($attr as $kv)
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if (!empty($kv[1]) && !isset($kv[3]) && !isset($kv[4]))
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$node['@attrib'][]=$kv[1];
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else
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$node['@attrib'][$kv[1]?:$kv[2]]=
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(isset($kv[3]) && $kv[3]!==''?
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$kv[3]:
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(isset($kv[4]) && $kv[4]!==''?
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$kv[4]:NULL));
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}
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}
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$tmp='';
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$ptr+=strlen($match[0]);
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$w=5;
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}
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else {
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// Text node
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$tmp.=substr($text,$ptr,$w);
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$ptr+=$w;
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if ($w<50)
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$w++;
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}
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if (strlen($tmp))
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// Append trailing text
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$tree[]=$tmp;
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// Break references
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unset($node);
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return $tree;
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}
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/**
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* Class constructor
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||
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* return object
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**/
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function __construct() {
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$ref=new ReflectionClass(get_called_class());
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$this->tags='';
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foreach ($ref->getmethods() as $method)
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if (preg_match('/^_(?=[[:alpha:]])/',$method->name))
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$this->tags.=(strlen($this->tags)?'|':'').
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substr($method->name,1);
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parent::__construct();
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}
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}
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