| 1 | <?php |
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| 2 | // +-----------------------------------------------------------------------+ |
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| 3 | // | template.php | |
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| 4 | // +-----------------------------------------------------------------------+ |
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| 5 | // | application : PhpWebGallery <http://phpwebgallery.net> | |
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| 6 | // | branch : BSF (Best So Far) | |
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| 7 | // +-----------------------------------------------------------------------+ |
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| 8 | // | file : $RCSfile$ |
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| 9 | // | last update : $Date: 2004-03-29 22:40:21 +0000 (Mon, 29 Mar 2004) $ |
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| 10 | // | last modifier : $Author: z0rglub $ |
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| 11 | // | revision : $Revision: 402 $ |
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| 12 | // +-----------------------------------------------------------------------+ |
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| 13 | // | This program is free software; you can redistribute it and/or modify | |
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| 14 | // | it under the terms of the GNU General Public License as published by | |
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| 15 | // | the Free Software Foundation | |
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| 16 | // | | |
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| 17 | // | This program is distributed in the hope that it will be useful, but | |
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| 18 | // | WITHOUT ANY WARRANTY; without even the implied warranty of | |
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| 19 | // | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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| 20 | // | General Public License for more details. | |
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| 21 | // | | |
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| 22 | // | You should have received a copy of the GNU General Public License | |
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| 23 | // | along with this program; if not, write to the Free Software | |
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| 24 | // | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
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| 25 | // | USA. | |
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| 26 | // +-----------------------------------------------------------------------+ |
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| 27 | |
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| 28 | /** |
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| 29 | * Template class. By Nathan Codding of the phpBB group. The interface was |
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| 30 | * originally inspired by PHPLib templates, and the template file formats |
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| 31 | * are quite similar. |
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| 32 | */ |
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| 33 | |
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| 34 | class Template { |
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| 35 | |
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| 36 | var $classname = "Template"; |
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| 37 | |
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| 38 | // variable that holds all the data we'll be substituting into |
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| 39 | // the compiled templates. |
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| 40 | // ... |
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| 41 | // This will end up being a multi-dimensional array like this : |
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| 42 | // $this->_tpldata[block.][iteration#][child.][iteration#][child2.][iteration#][variablename] == value |
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| 43 | // if it's a root-level variable, it'll be like this: |
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| 44 | // $this->_tpldata[.][0][varname] == value |
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| 45 | var $_tpldata = array(); |
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| 46 | |
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| 47 | // Hash of filenames for each template handle. |
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| 48 | var $files = array(); |
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| 49 | |
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| 50 | // Root template directory. |
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| 51 | var $root = ""; |
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| 52 | |
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| 53 | // this will hash handle names to the compiled code for that handle. |
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| 54 | var $compiled_code = array(); |
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| 55 | |
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| 56 | // This will hold the uncompiled code for that handle. |
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| 57 | var $uncompiled_code = array(); |
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| 58 | |
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| 59 | /** |
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| 60 | * Constructor. Simply sets the root dir. |
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| 61 | * |
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| 62 | */ |
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| 63 | function Template($root = ".") |
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| 64 | { |
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| 65 | $this->set_rootdir($root); |
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| 66 | } |
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| 67 | |
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| 68 | /** |
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| 69 | * Destroys this template object. Should be called when you're done with |
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| 70 | * it, in order to clear out the template data so you can load/parse a new |
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| 71 | * template set. |
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| 72 | */ |
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| 73 | function destroy() |
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| 74 | { |
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| 75 | $this->_tpldata = array(); |
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| 76 | } |
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| 77 | |
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| 78 | /** |
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| 79 | * Sets the template root directory for this Template object. |
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| 80 | */ |
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| 81 | function set_rootdir($dir) |
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| 82 | { |
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| 83 | if (!is_dir($dir)) |
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| 84 | { |
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| 85 | return false; |
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| 86 | } |
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| 87 | |
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| 88 | $this->root = $dir; |
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| 89 | return true; |
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| 90 | } |
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| 91 | |
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| 92 | /** |
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| 93 | * Sets the template filenames for handles. $filename_array should be a |
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| 94 | * hash of handle => filename pairs. |
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| 95 | */ |
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| 96 | function set_filenames($filename_array) |
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| 97 | { |
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| 98 | if (!is_array($filename_array)) |
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| 99 | { |
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| 100 | return false; |
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| 101 | } |
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| 102 | |
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| 103 | reset($filename_array); |
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| 104 | while(list($handle, $filename) = each($filename_array)) |
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| 105 | { |
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| 106 | $this->files[$handle] = $this->make_filename($filename); |
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| 107 | } |
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| 108 | |
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| 109 | return true; |
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| 110 | } |
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| 111 | |
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| 112 | |
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| 113 | /** |
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| 114 | * Load the file for the handle, compile the file, and run the compiled |
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| 115 | * code. This will print out the results of executing the template. |
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| 116 | */ |
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| 117 | function pparse($handle) |
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| 118 | { |
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| 119 | if (!$this->loadfile($handle)) |
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| 120 | { |
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| 121 | die("Template->pparse(): Couldn't load template file for handle $handle"); |
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| 122 | } |
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| 123 | |
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| 124 | // actually compile the template now. |
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| 125 | if (!isset($this->compiled_code[$handle]) || empty($this->compiled_code[$handle])) |
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| 126 | { |
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| 127 | // Actually compile the code now. |
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| 128 | $this->compiled_code[$handle] = $this->compile($this->uncompiled_code[$handle]); |
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| 129 | } |
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| 130 | |
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| 131 | // Run the compiled code. |
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| 132 | //echo ("<!-- ".$this->compiled_code[$handle]." -->"); |
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| 133 | eval($this->compiled_code[$handle]); |
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| 134 | return true; |
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| 135 | } |
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| 136 | |
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| 137 | /** |
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| 138 | * Inserts the uncompiled code for $handle as the value of $varname in the |
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| 139 | * root-level. This can be used to effectively include a template in the |
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| 140 | * middle of another template. |
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| 141 | * |
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| 142 | * Note that all desired assignments to the variables in $handle should be |
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| 143 | * done BEFORE calling this function. |
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| 144 | */ |
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| 145 | function assign_var_from_handle($varname, $handle) |
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| 146 | { |
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| 147 | if (!$this->loadfile($handle)) |
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| 148 | { |
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| 149 | die("Template->assign_var_from_handle(): Couldn't load template file for handle $handle"); |
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| 150 | } |
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| 151 | |
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| 152 | // Compile it, with the "no echo statements" option on. |
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| 153 | $_str = ""; |
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| 154 | $code = $this->compile($this->uncompiled_code[$handle], true, '_str'); |
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| 155 | |
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| 156 | // evaluate the variable assignment. |
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| 157 | eval($code); |
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| 158 | // assign the value of the generated variable to the given varname. |
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| 159 | $this->assign_var($varname, $_str); |
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| 160 | |
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| 161 | return true; |
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| 162 | } |
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| 163 | |
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| 164 | /** |
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| 165 | * Block-level variable assignment. Adds a new block iteration with the |
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| 166 | * given variable assignments. Note that this should only be called once |
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| 167 | * per block iteration. |
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| 168 | */ |
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| 169 | function assign_block_vars($blockname, $vararray) |
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| 170 | { |
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| 171 | if (strstr($blockname, '.')) |
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| 172 | { |
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| 173 | // Nested block. |
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| 174 | $blocks = explode('.', $blockname); |
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| 175 | $blockcount = sizeof($blocks) - 1; |
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| 176 | $str = '$this->_tpldata'; |
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| 177 | for ($i = 0; $i < $blockcount; $i++) |
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| 178 | { |
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| 179 | $str .= '[\'' . $blocks[$i] . '.\']'; |
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| 180 | eval('$lastiteration = sizeof(' . $str . ') - 1;'); |
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| 181 | $str .= '[' . $lastiteration . ']'; |
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| 182 | } |
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| 183 | // Now we add the block that we're actually assigning to. |
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| 184 | // We're adding a new iteration to this block with the given |
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| 185 | // variable assignments. |
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| 186 | $str .= '[\'' . $blocks[$blockcount] . '.\'][] = $vararray;'; |
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| 187 | |
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| 188 | // Now we evaluate this assignment we've built up. |
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| 189 | eval($str); |
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| 190 | } |
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| 191 | else |
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| 192 | { |
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| 193 | // Top-level block. Add a new iteration to this block with the |
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| 194 | // variable assignments we were given. |
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| 195 | $this->_tpldata[$blockname . '.'][] = $vararray; |
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| 196 | } |
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| 197 | |
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| 198 | return true; |
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| 199 | } |
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| 200 | |
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| 201 | /** |
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| 202 | * Root-level variable assignment. Adds to current assignments, overriding |
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| 203 | * any existing variable assignment with the same name. |
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| 204 | */ |
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| 205 | function assign_vars($vararray) |
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| 206 | { |
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| 207 | reset ($vararray); |
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| 208 | while (list($key, $val) = each($vararray)) |
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| 209 | { |
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| 210 | $this->_tpldata['.'][0][$key] = $val; |
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| 211 | } |
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| 212 | |
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| 213 | return true; |
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| 214 | } |
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| 215 | |
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| 216 | /** |
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| 217 | * Root-level variable assignment. Adds to current assignments, overriding |
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| 218 | * any existing variable assignment with the same name. |
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| 219 | */ |
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| 220 | function assign_var($varname, $varval) |
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| 221 | { |
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| 222 | $this->_tpldata['.'][0][$varname] = $varval; |
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| 223 | |
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| 224 | return true; |
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| 225 | } |
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| 226 | |
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| 227 | |
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| 228 | /** |
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| 229 | * Generates a full path+filename for the given filename, which can either |
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| 230 | * be an absolute name, or a name relative to the rootdir for this |
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| 231 | * Template object. |
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| 232 | */ |
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| 233 | function make_filename($filename) |
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| 234 | { |
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| 235 | // Check if it's an absolute or relative path. |
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| 236 | if (substr($filename, 0, 1) != '/') |
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| 237 | { |
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| 238 | $filename = realpath($this->root . '/' . $filename); |
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| 239 | } |
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| 240 | |
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| 241 | if (!file_exists($filename)) |
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| 242 | { |
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| 243 | die("Template->make_filename(): Error - file $filename does not exist"); |
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| 244 | } |
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| 245 | |
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| 246 | return $filename; |
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| 247 | } |
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| 248 | |
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| 249 | |
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| 250 | /** |
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| 251 | * If not already done, load the file for the given handle and populate |
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| 252 | * the uncompiled_code[] hash with its code. Do not compile. |
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| 253 | */ |
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| 254 | function loadfile($handle) |
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| 255 | { |
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| 256 | // If the file for this handle is already loaded and compiled, do |
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| 257 | // nothing. |
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| 258 | if (isset($this->uncompiled_code[$handle]) |
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| 259 | and !empty($this->uncompiled_code[$handle])) |
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| 260 | { |
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| 261 | return true; |
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| 262 | } |
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| 263 | |
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| 264 | // If we don't have a file assigned to this handle, die. |
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| 265 | if (!isset($this->files[$handle])) |
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| 266 | { |
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| 267 | die("Template->loadfile(): No file specified for handle $handle"); |
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| 268 | } |
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| 269 | |
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| 270 | $filename = $this->files[$handle]; |
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| 271 | |
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| 272 | $str = implode("", @file($filename)); |
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| 273 | if (empty($str)) |
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| 274 | { |
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| 275 | die("Template->loadfile(): File $filename for handle $handle is empty"); |
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| 276 | } |
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| 277 | |
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| 278 | $this->uncompiled_code[$handle] = $str; |
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| 279 | |
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| 280 | return true; |
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| 281 | } |
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| 282 | |
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| 283 | |
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| 284 | |
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| 285 | /** |
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| 286 | * Compiles the given string of code, and returns the result in a string. |
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| 287 | * |
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| 288 | * If "do_not_echo" is true, the returned code will not be directly |
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| 289 | * executable, but can be used as part of a variable assignment for use in |
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| 290 | * assign_code_from_handle(). |
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| 291 | */ |
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| 292 | function compile($code, $do_not_echo = false, $retvar = '') |
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| 293 | { |
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| 294 | // replace \ with \\ and then ' with \'. |
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| 295 | $code = str_replace('\\', '\\\\', $code); |
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| 296 | $code = str_replace('\'', '\\\'', $code); |
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| 297 | |
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| 298 | // change template varrefs into PHP varrefs |
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| 299 | |
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| 300 | // This one will handle varrefs WITH namespaces |
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| 301 | $varrefs = array(); |
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| 302 | preg_match_all('#\{(([a-z0-9\-_]+?\.)+?)([a-z0-9\-_]+?)\}#is', $code, $varrefs); |
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| 303 | $varcount = sizeof($varrefs[1]); |
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| 304 | for ($i = 0; $i < $varcount; $i++) |
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| 305 | { |
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| 306 | $namespace = $varrefs[1][$i]; |
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| 307 | $varname = $varrefs[3][$i]; |
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| 308 | $new = $this->generate_block_varref($namespace, $varname); |
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| 309 | |
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| 310 | $code = str_replace($varrefs[0][$i], $new, $code); |
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| 311 | } |
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| 312 | |
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| 313 | // This will handle the remaining root-level varrefs |
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| 314 | $code = preg_replace('#\{([a-z0-9\-_]*?)\}#is', '\' . ( ( isset($this->_tpldata[\'.\'][0][\'\1\']) ) ? $this->_tpldata[\'.\'][0][\'\1\'] : \'\' ) . \'', $code); |
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| 315 | |
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| 316 | // Break it up into lines. |
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| 317 | $code_lines = explode("\n", $code); |
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| 318 | |
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| 319 | $block_nesting_level = 0; |
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| 320 | $block_names = array(); |
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| 321 | $block_names[0] = "."; |
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| 322 | |
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| 323 | // Second: prepend echo ', append ' . "\n"; to each line. |
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| 324 | $line_count = sizeof($code_lines); |
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| 325 | for ($i = 0; $i < $line_count; $i++) |
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| 326 | { |
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| 327 | $code_lines[$i] = chop($code_lines[$i]); |
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| 328 | if (preg_match('#<!-- BEGIN (.*?) -->#', $code_lines[$i], $m)) |
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| 329 | { |
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| 330 | $n[0] = $m[0]; |
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| 331 | $n[1] = $m[1]; |
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| 332 | |
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| 333 | // Added: dougk_ff7-Keeps templates from bombing if begin is on |
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| 334 | // the same line as end.. I think. :) |
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| 335 | if ( preg_match('#<!-- END (.*?) -->#', $code_lines[$i], $n) ) |
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| 336 | { |
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| 337 | $block_nesting_level++; |
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| 338 | $block_names[$block_nesting_level] = $m[1]; |
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| 339 | if ($block_nesting_level < 2) |
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| 340 | { |
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| 341 | // Block is not nested. |
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| 342 | $code_lines[$i] = '$_' . $n[1] . '_count = ( isset($this->_tpldata[\'' . $n[1] . '.\']) ) ? sizeof($this->_tpldata[\'' . $n[1] . '.\']) : 0;'; |
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| 343 | $code_lines[$i] .= "\n" . 'for ($_' . $n[1] . '_i = 0; $_' . $n[1] . '_i < $_' . $n[1] . '_count; $_' . $n[1] . '_i++)'; |
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| 344 | $code_lines[$i] .= "\n" . '{'; |
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| 345 | } |
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| 346 | else |
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| 347 | { |
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| 348 | // This block is nested. |
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| 349 | |
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| 350 | // Generate a namespace string for this block. |
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| 351 | $namespace = implode('.', $block_names); |
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| 352 | // strip leading period from root level.. |
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| 353 | $namespace = substr($namespace, 2); |
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| 354 | // Get a reference to the data array for this block that depends on the |
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| 355 | // current indices of all parent blocks. |
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| 356 | $varref = $this->generate_block_data_ref($namespace, false); |
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| 357 | // Create the for loop code to iterate over this block. |
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| 358 | $code_lines[$i] = '$_' . $n[1] . '_count = ( isset(' . $varref . ') ) ? sizeof(' . $varref . ') : 0;'; |
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| 359 | $code_lines[$i] .= "\n" . 'for ($_' . $n[1] . '_i = 0; $_' . $n[1] . '_i < $_' . $n[1] . '_count; $_' . $n[1] . '_i++)'; |
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| 360 | $code_lines[$i] .= "\n" . '{'; |
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| 361 | } |
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| 362 | |
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| 363 | // We have the end of a block. |
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| 364 | unset($block_names[$block_nesting_level]); |
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| 365 | $block_nesting_level--; |
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| 366 | $code_lines[$i] .= '} // END ' . $n[1]; |
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| 367 | $m[0] = $n[0]; |
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| 368 | $m[1] = $n[1]; |
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| 369 | } |
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| 370 | else |
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| 371 | { |
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| 372 | // We have the start of a block. |
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| 373 | $block_nesting_level++; |
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| 374 | $block_names[$block_nesting_level] = $m[1]; |
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| 375 | if ($block_nesting_level < 2) |
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| 376 | { |
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| 377 | // Block is not nested. |
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| 378 | $code_lines[$i] = '$_' . $m[1] . '_count = ( isset($this->_tpldata[\'' . $m[1] . '.\']) ) ? sizeof($this->_tpldata[\'' . $m[1] . '.\']) : 0;'; |
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| 379 | $code_lines[$i] .= "\n" . 'for ($_' . $m[1] . '_i = 0; $_' . $m[1] . '_i < $_' . $m[1] . '_count; $_' . $m[1] . '_i++)'; |
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| 380 | $code_lines[$i] .= "\n" . '{'; |
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| 381 | } |
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| 382 | else |
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| 383 | { |
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| 384 | // This block is nested. |
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| 385 | |
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| 386 | // Generate a namespace string for this block. |
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| 387 | $namespace = implode('.', $block_names); |
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| 388 | // strip leading period from root level.. |
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| 389 | $namespace = substr($namespace, 2); |
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| 390 | // Get a reference to the data array for this block that |
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| 391 | // depends on the current indices of all parent blocks. |
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| 392 | $varref = $this->generate_block_data_ref($namespace, false); |
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| 393 | // Create the for loop code to iterate over this block. |
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| 394 | $code_lines[$i] = '$_' . $m[1] . '_count = ( isset(' . $varref . ') ) ? sizeof(' . $varref . ') : 0;'; |
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| 395 | $code_lines[$i] .= "\n" . 'for ($_' . $m[1] . '_i = 0; $_' . $m[1] . '_i < $_' . $m[1] . '_count; $_' . $m[1] . '_i++)'; |
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| 396 | $code_lines[$i] .= "\n" . '{'; |
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| 397 | } |
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| 398 | } |
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| 399 | } |
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| 400 | else if (preg_match('#<!-- END (.*?) -->#', $code_lines[$i], $m)) |
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| 401 | { |
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| 402 | // We have the end of a block. |
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| 403 | unset($block_names[$block_nesting_level]); |
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| 404 | $block_nesting_level--; |
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| 405 | $code_lines[$i] = '} // END ' . $m[1]; |
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| 406 | } |
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| 407 | else |
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| 408 | { |
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| 409 | // We have an ordinary line of code. |
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| 410 | if (!$do_not_echo) |
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| 411 | { |
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| 412 | $code_lines[$i] = 'echo \'' . $code_lines[$i] . '\' . "\\n";'; |
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| 413 | } |
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| 414 | else |
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| 415 | { |
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| 416 | $code_lines[$i] = '$' . $retvar . '.= \'' . $code_lines[$i] . '\' . "\\n";'; |
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| 417 | } |
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| 418 | } |
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| 419 | } |
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| 420 | |
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| 421 | // Bring it back into a single string of lines of code. |
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| 422 | $code = implode("\n", $code_lines); |
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| 423 | return $code ; |
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| 424 | |
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| 425 | } |
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| 426 | |
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| 427 | |
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| 428 | /** |
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| 429 | * Generates a reference to the given variable inside the given (possibly |
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| 430 | * nested) block namespace. This is a string of the form: ' |
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| 431 | * . $this->_tpldata['parent'][$_parent_i]['$child1'][$_child1_i]['$child2'][$_child2_i]...['varname'] |
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| 432 | * . ' It's ready to be inserted into an "echo" line in one of the |
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| 433 | * templates. NOTE: expects a trailing "." on the namespace. |
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| 434 | */ |
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| 435 | function generate_block_varref($namespace, $varname) |
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| 436 | { |
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| 437 | // Strip the trailing period. |
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| 438 | $namespace = substr($namespace, 0, strlen($namespace) - 1); |
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| 439 | |
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| 440 | // Get a reference to the data block for this namespace. |
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| 441 | $varref = $this->generate_block_data_ref($namespace, true); |
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| 442 | // Prepend the necessary code to stick this in an echo line. |
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| 443 | |
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| 444 | // Append the variable reference. |
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| 445 | $varref .= '[\'' . $varname . '\']'; |
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| 446 | |
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| 447 | $varref = '\' . ( ( isset(' . $varref . ') ) ? ' . $varref . ' : \'\' ) . \''; |
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| 448 | |
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| 449 | return $varref; |
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| 450 | |
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| 451 | } |
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| 452 | |
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| 453 | |
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| 454 | /** |
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| 455 | * Generates a reference to the array of data values for the given |
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| 456 | * (possibly nested) block namespace. This is a string of the form: |
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| 457 | * $this->_tpldata['parent'][$_parent_i]['$child1'][$_child1_i]['$child2'][$_child2_i]...['$childN'] |
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| 458 | * |
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| 459 | * If $include_last_iterator is true, then [$_childN_i] will be appended |
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| 460 | * to the form shown above. NOTE: does not expect a trailing "." on the |
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| 461 | * blockname. |
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| 462 | */ |
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| 463 | function generate_block_data_ref($blockname, $include_last_iterator) |
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| 464 | { |
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| 465 | // Get an array of the blocks involved. |
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| 466 | $blocks = explode(".", $blockname); |
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| 467 | $blockcount = sizeof($blocks) - 1; |
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| 468 | $varref = '$this->_tpldata'; |
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| 469 | // Build up the string with everything but the last child. |
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| 470 | for ($i = 0; $i < $blockcount; $i++) |
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| 471 | { |
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| 472 | $varref .= '[\'' . $blocks[$i] . '.\'][$_' . $blocks[$i] . '_i]'; |
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| 473 | } |
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| 474 | // Add the block reference for the last child. |
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| 475 | $varref .= '[\'' . $blocks[$blockcount] . '.\']'; |
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| 476 | // Add the iterator for the last child if requried. |
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| 477 | if ($include_last_iterator) |
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| 478 | { |
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| 479 | $varref .= '[$_' . $blocks[$blockcount] . '_i]'; |
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| 480 | } |
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| 481 | |
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| 482 | return $varref; |
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| 483 | } |
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| 484 | |
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| 485 | } |
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| 486 | |
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| 487 | ?> |
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