MiniTemplator::parseWord() - Code Metrics - Inspection of "more cleanup and migration of login/register/logou..." - codysnider/tt-rss - Measure and Improve Code Quality continuously with Scrutinizer

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by Cody
created 2019-12-23 06:58 UTC
MiniTemplator::parseWord() A

↳ Parent: MiniTemplator
Complexity

Conditions	6
Paths	6
Size

Total Lines	14
Code Lines	10
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
cc	6
eloc	10
c	0
b	0
f	0
nc	6
nop	3
dl	0
loc	14
rs	9.2222
<?php
/**
* File MiniTemplator.class.php
* @package MiniTemplator
*/

/**
* A compact template engine for HTML files.
*
* Requires PHP 4.0.4 or newer.
*
* <pre>
* Template syntax:
*
*   Variables:
*     ${VariableName}
*
*   Blocks:
*     &lt;!-- $BeginBlock BlockName --&gt;
*     ... block content ...
*     &lt;!-- $EndBlock BlockName --&gt;
*
*   Include a subtemplate:
*     &lt;!-- $Include RelativeFileName --&gt;
* </pre>
*
* <pre>
* General remarks:
*  - Variable names and block names are case-insensitive.
*  - The same variable may be used multiple times within a template.
*  - Blocks can be nested.
*  - Multiple blocks with the same name may occur within a template.
* </pre>
*
* <pre>
* Public methods:
*   readTemplateFromFile   - Reads the template from a file.
*   setTemplateString      - Assigns a new template string.
*   setVariable            - Sets a template variable.
*   setVariableEsc         - Sets a template variable to an escaped string value.
*   variableExists         - Checks whether a template variable exists.
*   addBlock               - Adds an instance of a template block.
*   blockExists            - Checks whether a block exists.
*   reset                  - Clears all variables and blocks.
*   generateOutput         - Generates the HTML page and writes it to the PHP output stream.
*   generateOutputToFile   - Generates the HTML page and writes it to a file.
*   generateOutputToString - Generates the HTML page and writes it to a string.
* </pre>
*
* Home page: {@link http://www.source-code.biz/MiniTemplator}<br>
* License: This module is released under the GNU/LGPL license ({@link http://www.gnu.org/licenses/lgpl.html}).<br>
* Copyright 2003: Christian d'Heureuse, Inventec Informatik AG, Switzerland. All rights reserved.<br>
* This product is provided "as is" without warranty of any kind.<br>
*
* Version history:<br>
* 2001-10-24 Christian d'Heureuse (chdh): VBasic version created.<br>
* 2002-01-26 Markus Angst: ported to PHP4.<br>
* 2003-04-07 chdh: changes to adjust to Java version.<br>
* 2003-07-08 chdh: Method variableExists added.
*   Method setVariable changed to trigger an error when the variable does not exist.<br>
* 2004-04-07 chdh: Parameter isOptional added to method setVariable.
*   Licensing changed from GPL to LGPL.<br>
* 2004-04-18 chdh: Method blockExists added.<br>
* 2004-10-28 chdh:<br>
*   Method setVariableEsc added.<br>
*   Multiple blocks with the same name may now occur within a template.<br>
*   No error ("unknown command") is generated any more, if a HTML comment starts with "${".<br>
* 2004-11-06 chdh:<br>
*   "$Include" command implemented.<br>
* 2004-11-20 chdh:<br>
*   "$Include" command changed so that the command text is not copied to the output file.<br>
*/

class MiniTemplator {

//--- public member variables ---------------------------------------------------------------------------------------

/**
* Base path for relative file names of subtemplates (for the $Include command).
* This path is prepended to the subtemplate file names. It must be set before
* readTemplateFromFile or setTemplateString.
* @access public
*/
var $subtemplateBasePath;

//--- private member variables --------------------------------------------------------------------------------------

/**#@+
* @access private
*/

var $maxNestingLevel = 50; // maximum number of block nestings
var $maxInclTemplateSize = 1000000; // maximum length of template string when including subtemplates
var $template; // Template file data
var $varTab; // variables table, array index is variable no
    // Fields:
    //  varName                       // variable name
    //  varValue                      // variable value
var $varTabCnt; // no of entries used in VarTab
var $varNameToNoMap; // maps variable names to variable numbers
var $varRefTab; // variable references table
    // Contains an entry for each variable reference in the template. Ordered by TemplatePos.
    // Fields:
    //  varNo                         // variable no
    //  tPosBegin                     // template position of begin of variable reference
    //  tPosEnd                       // template position of end of variable reference
    //  blockNo                       // block no of the (innermost) block that contains this variable reference
    //  blockVarNo                    // block variable no. Index into BlockInstTab.BlockVarTab
var $varRefTabCnt; // no of entries used in VarRefTab
var $blockTab; // Blocks table, array index is block no
    // Contains an entry for each block in the template. Ordered by TPosBegin.
    // Fields:
    //  blockName                     // block name
    //  nextWithSameName;             // block no of next block with same name or -1 (blocks are backward linked in relation to template position)
    //  tPosBegin                     // template position of begin of block
    //  tPosContentsBegin             // template pos of begin of block contents
    //  tPosContentsEnd               // template pos of end of block contents
    //  tPosEnd                       // template position of end of block
    //  nestingLevel                  // block nesting level
    //  parentBlockNo                 // block no of parent block
    //  definitionIsOpen              // true while $BeginBlock processed but no $EndBlock
    //  instances                     // number of instances of this block
    //  firstBlockInstNo              // block instance no of first instance of this block or -1
    //  lastBlockInstNo               // block instance no of last instance of this block or -1
    //  currBlockInstNo               // current block instance no, used during generation of output file
    //  blockVarCnt                   // no of variables in block
    //  blockVarNoToVarNoMap          // maps block variable numbers to variable numbers
    //  firstVarRefNo                 // variable reference no of first variable of this block or -1
var $blockTabCnt; // no of entries used in BlockTab
var $blockNameToNoMap; // maps block names to block numbers
var $openBlocksTab;
    // During parsing, this table contains the block numbers of the open parent blocks (nested outer blocks).
    // Indexed by the block nesting level.
var $blockInstTab; // block instances table
    // This table contains an entry for each block instance that has been added.
    // Indexed by BlockInstNo.
    // Fields:
    //  blockNo                       // block number
    //  instanceLevel                 // instance level of this block
    //     InstanceLevel is an instance counter per block.
    //     (In contrast to blockInstNo, which is an instance counter over the instances of all blocks)
    //  parentInstLevel               // instance level of parent block
    //  nextBlockInstNo               // pointer to next instance of this block or -1
    //     Forward chain for instances of same block.
    //  blockVarTab                   // block instance variables
var $blockInstTabCnt; // no of entries used in BlockInstTab

var $currentNestingLevel; // Current block nesting level during parsing.
var $templateValid; // true if a valid template is prepared
var $outputMode; // 0 = to PHP output stream, 1 = to file, 2 = to string
var $outputFileHandle; // file handle during writing of output file
var $outputError; // true when an output error occurred
var $outputString; // string buffer for the generated HTML page

/**#@-*/

//--- constructor ---------------------------------------------------------------------------------------------------

/**
* Constructs a MiniTemplator object.
* @access public
*/
function __construct() {

    $this->templateValid = false; }

//--- template string handling --------------------------------------------------------------------------------------

/**
* Reads the template from a file.
* @param  string   $fileName  name of the file that contains the template.
* @return boolean  true on success, false on error.
* @access public
*/
function readTemplateFromFile($fileName) {

    if (!$this->readFileIntoString($fileName, $s)) {
        $this->triggerError("Error while reading template file ".$fileName.".");
        return false; }
    if (!$this->setTemplateString($s)) {
        return false;
    }
    return true; }

/**
* Assigns a new template string.
* @param  string   $templateString  contents of the template file.
* @return boolean  true on success, false on error.
* @access public
*/
function setTemplateString($templateString) {

    $this->templateValid = false;
    $this->template = $templateString;
    if (!$this->parseTemplate()) {
        return false;
    }
    $this->reset();
    $this->templateValid = true;
    return true; }

/**
* Loads the template string for a subtemplate (used for the $Include command).
* @return boolean  true on success, false on error.
* @access private
*/
function loadSubtemplate($subtemplateName, &$s) {

    $subtemplateFileName = $this->combineFileSystemPath($this->subtemplateBasePath, $subtemplateName);
    if (!$this->readFileIntoString($subtemplateFileName, $s)) {
        $this->triggerError("Error while reading subtemplate file ".$subtemplateFileName.".");
        return false; }
    return true; }

//--- template parsing ----------------------------------------------------------------------------------------------

/**
* Parses the template.
* @return boolean  true on success, false on error.
* @access private
*/
function parseTemplate() {

    $this->initParsing();
    $this->beginMainBlock();
    if (!$this->parseTemplateCommands()) {
        return false;
    }
    $this->endMainBlock();
    if (!$this->checkBlockDefinitionsComplete()) {
        return false;
    }
    if (!$this->parseTemplateVariables()) {
        return false;
    }
    $this->associateVariablesWithBlocks();
    return true; }

/**
* @access private
*/
function initParsing() {

    $this->varTab = array();
    $this->varTabCnt = 0;
    $this->varNameToNoMap = array();
    $this->varRefTab = array();
    $this->varRefTabCnt = 0;
    $this->blockTab = array();
    $this->blockTabCnt = 0;
    $this->blockNameToNoMap = array();
    $this->openBlocksTab = array(); }

/**
* Registers the main block.
* The main block is an implicitly defined block that covers the whole template.
* @access private
*/
function beginMainBlock() {

    $blockNo = 0;
    $this->registerBlock('@@InternalMainBlock@@', $blockNo);
    $bte = & $this->blockTab[$blockNo];
    $bte['tPosBegin'] = 0;
    $bte['tPosContentsBegin'] = 0;
    $bte['nestingLevel'] = 0;
    $bte['parentBlockNo'] = -1;
    $bte['definitionIsOpen'] = true;
    $this->openBlocksTab[0] = $blockNo;
    $this->currentNestingLevel = 1; }

/**
* Completes the main block registration.
* @access private
*/
function endMainBlock() {

    $bte = & $this->blockTab[0];
    $bte['tPosContentsEnd'] = strlen($this->template);
    $bte['tPosEnd'] = strlen($this->template);
    $bte['definitionIsOpen'] = false;
    $this->currentNestingLevel -= 1; }

/**
* Parses commands within the template in the format "<!-- $command parameters -->".
* @return boolean  true on success, false on error.
* @access private
*/
function parseTemplateCommands() {

    $p = 0;
    while (true) {
        $p0 = strpos($this->template, '<!--', $p);
        if ($p0 === false) {
            break;
        }
        $p = strpos($this->template, '-->', $p0);
        if ($p === false) {
            $this->triggerError("Invalid HTML comment in template at offset $p0.");
            return false; }
        $p += 3;
        $cmdL = substr($this->template, $p0 + 4, $p - $p0 - 7);
        if (!$this->processTemplateCommand($cmdL, $p0, $p, $resumeFromStart)) {
                    return false;
        }
        if ($resumeFromStart) {
            $p = $p0;
        }
        }
    return true; }

/**
* @return boolean  true on success, false on error.
* @access private
*/
function processTemplateCommand($cmdL, $cmdTPosBegin, $cmdTPosEnd, &$resumeFromStart) {

    $resumeFromStart = false;
    $p = 0;
    $cmd = '';
    if (!$this->parseWord($cmdL, $p, $cmd)) {
        return true;
    }
    $parms = substr($cmdL, $p);
    switch (strtoupper($cmd)) {
    case '$BEGINBLOCK':
     if (!$this->processBeginBlockCmd($parms, $cmdTPosBegin, $cmdTPosEnd)) {
                return false;
        }
        break;
    case '$ENDBLOCK':
     if (!$this->processEndBlockCmd($parms, $cmdTPosBegin, $cmdTPosEnd)) {
                return false;
        }
        break;
    case '$INCLUDE':
     if (!$this->processincludeCmd($parms, $cmdTPosBegin, $cmdTPosEnd)) {
                return false;
        }
        $resumeFromStart = true;
        break;
    default:
     if ($cmd{0} == '$' && !(strlen($cmd) >= 2 && $cmd{1} == '{')) {
        $this->triggerError("Unknown command \"$cmd\" in template at offset $cmdTPosBegin.");
        return false; }}
    return true; }

/**
* Processes the $BeginBlock command.
* @return boolean  true on success, false on error.
* @access private
*/
function processBeginBlockCmd($parms, $cmdTPosBegin, $cmdTPosEnd) {

    $p = 0;
    if (!$this->parseWord($parms, $p, $blockName)) {
        $this->triggerError("Missing block name in \$BeginBlock command in template at offset $cmdTPosBegin.");
        return false; }
    if (trim(substr($parms, $p)) != '') {
        $this->triggerError("Extra parameter in \$BeginBlock command in template at offset $cmdTPosBegin.");
        return false; }
    $this->registerBlock($blockName, $blockNo);
    $btr = & $this->blockTab[$blockNo];
    $btr['tPosBegin'] = $cmdTPosBegin;
    $btr['tPosContentsBegin'] = $cmdTPosEnd;
    $btr['nestingLevel'] = $this->currentNestingLevel;
    $btr['parentBlockNo'] = $this->openBlocksTab[$this->currentNestingLevel - 1];
    $this->openBlocksTab[$this->currentNestingLevel] = $blockNo;
    $this->currentNestingLevel += 1;
    if ($this->currentNestingLevel > $this->maxNestingLevel) {
        $this->triggerError("Block nesting overflow in template at offset $cmdTPosBegin.");
        return false; }
    return true; }

/**
* Processes the $EndBlock command.
* @return boolean  true on success, false on error.
* @access private
*/
function processEndBlockCmd($parms, $cmdTPosBegin, $cmdTPosEnd) {

    $p = 0;
    if (!$this->parseWord($parms, $p, $blockName)) {
        $this->triggerError("Missing block name in \$EndBlock command in template at offset $cmdTPosBegin.");
        return false; }
    if (trim(substr($parms, $p)) != '') {
        $this->triggerError("Extra parameter in \$EndBlock command in template at offset $cmdTPosBegin.");
        return false; }
    if (!$this->lookupBlockName($blockName, $blockNo)) {
        $this->triggerError("Undefined block name \"$blockName\" in \$EndBlock command in template at offset $cmdTPosBegin.");
        return false; }
    $this->currentNestingLevel -= 1;
    $btr = & $this->blockTab[$blockNo];
    if (!$btr['definitionIsOpen']) {
        $this->triggerError("Multiple \$EndBlock command for block \"$blockName\" in template at offset $cmdTPosBegin.");
        return false; }
    if ($btr['nestingLevel'] != $this->currentNestingLevel) {
        $this->triggerError("Block nesting level mismatch at \$EndBlock command for block \"$blockName\" in template at offset $cmdTPosBegin.");
        return false; }
    $btr['tPosContentsEnd'] = $cmdTPosBegin;
    $btr['tPosEnd'] = $cmdTPosEnd;
    $btr['definitionIsOpen'] = false;
    return true; }

/**
* @access private
*/
function registerBlock($blockName, &$blockNo) {

    $blockNo = $this->blockTabCnt++;
    $btr = & $this->blockTab[$blockNo];
    $btr = array();
    $btr['blockName'] = $blockName;
    if (!$this->lookupBlockName($blockName, $btr['nextWithSameName'])) {
            $btr['nextWithSameName'] = -1;
    }
    $btr['definitionIsOpen'] = true;
    $btr['instances'] = 0;
    $btr['firstBlockInstNo'] = -1;
    $btr['lastBlockInstNo'] = -1;
    $btr['blockVarCnt'] = 0;
    $btr['firstVarRefNo'] = -1;
    $btr['blockVarNoToVarNoMap'] = array();
    $this->blockNameToNoMap[strtoupper($blockName)] = $blockNo; }

/**
* Checks that all block definitions are closed.
* @return boolean  true on success, false on error.
* @access private
*/
function checkBlockDefinitionsComplete() {

    for ($blockNo = 0; $blockNo < $this->blockTabCnt; $blockNo++) {
        $btr = & $this->blockTab[$blockNo];
        if ($btr['definitionIsOpen']) {
            $this->triggerError("Missing \$EndBlock command in template for block ".$btr['blockName'].".");
            return false; }}
    if ($this->currentNestingLevel != 0) {
        $this->triggerError("Block nesting level error at end of template.");
        return false; }
    return true; }

/**
* Processes the $Include command.
* @return boolean  true on success, false on error.
* @access private
*/
function processIncludeCmd($parms, $cmdTPosBegin, $cmdTPosEnd) {

    $p = 0;
    if (!$this->parseWordOrQuotedString($parms, $p, $subtemplateName)) {
        $this->triggerError("Missing or invalid subtemplate name in \$Include command in template at offset $cmdTPosBegin.");
        return false; }
    if (trim(substr($parms, $p)) != '') {
        $this->triggerError("Extra parameter in \$include command in template at offset $cmdTPosBegin.");
        return false; }
    return $this->insertSubtemplate($subtemplateName, $cmdTPosBegin, $cmdTPosEnd); }

/**
* Processes the $Include command.
* @return boolean  true on success, false on error.
* @access private
*/
function insertSubtemplate($subtemplateName, $tPos1, $tPos2) {

    if (strlen($this->template) > $this->maxInclTemplateSize) {
        $this->triggerError("Subtemplate include aborted because the internal template string is longer than $this->maxInclTemplateSize characters.");
        return false; }
    if (!$this->loadSubtemplate($subtemplateName, $subtemplate)) {
        return false;
    }
    // (Copying the template to insert a subtemplate is a bit slow. In a future implementation of MiniTemplator,
    // a table could be used that contains references to the string fragments.)
    $this->template = substr($this->template, 0, $tPos1).$subtemplate.substr($this->template, $tPos2);
    return true; }

/**
* Parses variable references within the template in the format "${VarName}".
* @return boolean  true on success, false on error.
* @access private
*/
function parseTemplateVariables() {

    $p = 0;
    while (true) {
        $p = strpos($this->template, '${', $p);
        if ($p === false) {
            break;
        }
        $p0 = $p;
        $p = strpos($this->template, '}', $p);
        if ($p === false) {
            $this->triggerError("Invalid variable reference in template at offset $p0.");
            return false; }
        $p += 1;
        $varName = trim(substr($this->template, $p0 + 2, $p - $p0 - 3));
        if (strlen($varName) == 0) {
            $this->triggerError("Empty variable name in template at offset $p0.");
            return false; }
        $this->registerVariableReference($varName, $p0, $p); }
    return true; }

/**
* @access private
*/
function registerVariableReference($varName, $tPosBegin, $tPosEnd) {

    if (!$this->lookupVariableName($varName, $varNo)) {
            $this->registerVariable($varName, $varNo);
    }
    $varRefNo = $this->varRefTabCnt++;
    $vrtr = & $this->varRefTab[$varRefNo];
    $vrtr = array();
    $vrtr['tPosBegin'] = $tPosBegin;
    $vrtr['tPosEnd'] = $tPosEnd;
    $vrtr['varNo'] = $varNo; }

/**
* @access private
*/
function registerVariable($varName, &$varNo) {

    $varNo = $this->varTabCnt++;
    $vtr = & $this->varTab[$varNo];
    $vtr = array();
    $vtr['varName'] = $varName;
    $vtr['varValue'] = '';
    $this->varNameToNoMap[strtoupper($varName)] = $varNo; }

/**
* Associates variable references with blocks.
* @access private
*/
function associateVariablesWithBlocks() {

    $varRefNo = 0;
    $activeBlockNo = 0;
    $nextBlockNo = 1;
    while ($varRefNo < $this->varRefTabCnt) {
        $vrtr = & $this->varRefTab[$varRefNo];
        $varRefTPos = $vrtr['tPosBegin'];
        $varNo = $vrtr['varNo'];
        if ($varRefTPos >= $this->blockTab[$activeBlockNo]['tPosEnd']) {
            $activeBlockNo = $this->blockTab[$activeBlockNo]['parentBlockNo'];
            continue; }
        if ($nextBlockNo < $this->blockTabCnt) {
            if ($varRefTPos >= $this->blockTab[$nextBlockNo]['tPosBegin']) {
            $activeBlockNo = $nextBlockNo;
            $nextBlockNo += 1;
            continue; }}
        $btr = & $this->blockTab[$activeBlockNo];
        if ($varRefTPos < $btr['tPosBegin']) {
                    $this->programLogicError(1);
        }
        $blockVarNo = $btr['blockVarCnt']++;
        $btr['blockVarNoToVarNoMap'][$blockVarNo] = $varNo;
        if ($btr['firstVarRefNo'] == -1) {
                    $btr['firstVarRefNo'] = $varRefNo;
        }
        $vrtr['blockNo'] = $activeBlockNo;
        $vrtr['blockVarNo'] = $blockVarNo;
        $varRefNo += 1; }}

//--- build up (template variables and blocks) ----------------------------------------------------------------------

/**
* Clears all variables and blocks.
* This method can be used to produce another HTML page with the same
* template. It is faster than creating another MiniTemplator object,
* because the template does not have to be parsed again.
* All variable values are cleared and all added block instances are deleted.
* @access public
*/
function reset() {

    for ($varNo = 0; $varNo < $this->varTabCnt; $varNo++) {
            $this->varTab[$varNo]['varValue'] = '';
    }
    for ($blockNo = 0; $blockNo < $this->blockTabCnt; $blockNo++) {
        $btr = & $this->blockTab[$blockNo];
        $btr['instances'] = 0;
        $btr['firstBlockInstNo'] = -1;
        $btr['lastBlockInstNo'] = -1; }
    $this->blockInstTab = array();
    $this->blockInstTabCnt = 0; }

/**
* Sets a template variable.
* For variables that are used in blocks, the variable value
* must be set before {@link addBlock} is called.
* @param  string  $variableName   the name of the variable to be set.
* @param  string  $variableValue  the new value of the variable.
* @param  boolean $isOptional     Specifies whether an error should be
*    generated when the variable does not exist in the template. If
*    $isOptional is false and the variable does not exist, an error is
*    generated.
* @return boolean true on success, or false on error (e.g. when no
*    variable with the specified name exists in the template and
*    $isOptional is false).
* @access public
*/
function setVariable($variableName, $variableValue, $isOptional = false) {

    if (!$this->templateValid) {$this->triggerError("Template not valid."); return false; }
    if (!$this->lookupVariableName($variableName, $varNo)) {
        if ($isOptional) {
            return true;
        }
        $this->triggerError("Variable \"$variableName\" not defined in template.");
        return false; }
    $this->varTab[$varNo]['varValue'] = $variableValue;
    return true; }

/**
* Sets a template variable to an escaped string.
* This method is identical to (@link setVariable), except that
* the characters &lt;, &gt;, &amp;, ' and " of variableValue are
* replaced by their corresponding HTML/XML character entity codes.
* For variables that are used in blocks, the variable value
* must be set before {@link addBlock} is called.
* @param  string  $variableName   the name of the variable to be set.
* @param  string  $variableValue  the new value of the variable. Special HTML/XML characters are escaped.
* @param  boolean $isOptional     Specifies whether an error should be
*    generated when the variable does not exist in the template. If
*    $isOptional is false and the variable does not exist, an error is
*    generated.
* @return boolean true on success, or false on error (e.g. when no
*    variable with the specified name exists in the template and
*    $isOptional is false).
* @access public
*/
function setVariableEsc($variableName, $variableValue, $isOptional = false) {

    return $this->setVariable($variableName, htmlspecialchars($variableValue, ENT_QUOTES), $isOptional); }

/**
* Checks whether a variable with the specified name exists within the template.
* @param  string  $variableName   the name of the variable.
* @return boolean true if the variable exists, or false when no
*    variable with the specified name exists in the template.
* @access public
*/
function variableExists($variableName) {

    if (!$this->templateValid) {$this->triggerError("Template not valid."); return false; }
    return $this->lookupVariableName($variableName, $varNo); }

/**
* Adds an instance of a template block.
* If the block contains variables, these variables must be set
* before the block is added.
* If the block contains subblocks (nested blocks), the subblocks
* must be added before this block is added.
* If multiple blocks exist with the specified name, an instance
* is added for each block occurence.
* @param  string   blockName the name of the block to be added.
filter:
    dependency_paths: ["lib/*"]
* @return boolean  true on success, false on error (e.g. when no
*    block with the specified name exists in the template).
* @access public
*/
function addBlock($blockName) {

    if (!$this->templateValid) {$this->triggerError("Template not valid."); return false; }
    if (!$this->lookupBlockName($blockName, $blockNo)) {
        $this->triggerError("Block \"$blockName\" not defined in template.");
        return false; }
    while ($blockNo != -1) {
        $this->addBlockByNo($blockNo);
        $blockNo = $this->blockTab[$blockNo]['nextWithSameName']; }
    return true; }

/**
* @access private
*/
function addBlockByNo($blockNo) {

    $btr = & $this->blockTab[$blockNo];
    $this->registerBlockInstance($blockInstNo);
    $bitr = & $this->blockInstTab[$blockInstNo];
    if ($btr['firstBlockInstNo'] == -1) {
            $btr['firstBlockInstNo'] = $blockInstNo;
    }
    if ($btr['lastBlockInstNo'] != -1) {
            $this->blockInstTab[$btr['lastBlockInstNo']]['nextBlockInstNo'] = $blockInstNo;
    }
            // set forward pointer of chain
    $btr['lastBlockInstNo'] = $blockInstNo;
    $parentBlockNo = $btr['parentBlockNo'];
    $blockVarCnt = $btr['blockVarCnt'];
    $bitr['blockNo'] = $blockNo;
    $bitr['instanceLevel'] = $btr['instances']++;
    if ($parentBlockNo == -1) {
            $bitr['parentInstLevel'] = -1;
    } else {
            $bitr['parentInstLevel'] = $this->blockTab[$parentBlockNo]['instances'];
    }
    $bitr['nextBlockInstNo'] = -1;
    $bitr['blockVarTab'] = array();
    // copy instance variables for this block
    for ($blockVarNo = 0; $blockVarNo < $blockVarCnt; $blockVarNo++) {
        $varNo = $btr['blockVarNoToVarNoMap'][$blockVarNo];
        $bitr['blockVarTab'][$blockVarNo] = $this->varTab[$varNo]['varValue']; }}

/**
* @access private
*/
function registerBlockInstance(&$blockInstNo) {

    $blockInstNo = $this->blockInstTabCnt++; }

/**
* Checks whether a block with the specified name exists within the template.
* @param  string  $blockName   the name of the block.
* @return boolean true if the block exists, or false when no
*    block with the specified name exists in the template.
* @access public
*/
function blockExists($blockName) {

    if (!$this->templateValid) {$this->triggerError("Template not valid."); return false; }
    return $this->lookupBlockName($blockName, $blockNo); }

//--- output generation ---------------------------------------------------------------------------------------------

/**
* Generates the HTML page and writes it to the PHP output stream.
* @return boolean  true on success, false on error.
* @access public
*/
function generateOutput() {

    $this->outputMode = 0;
    if (!$this->generateOutputPage()) {
        return false;
    }
    return true; }

/**
* Generates the HTML page and writes it to a file.
* @param  string   $fileName  name of the output file.
* @return boolean  true on success, false on error.
* @access public
*/
function generateOutputToFile($fileName) {

    $fh = fopen($fileName, "wb");
    if ($fh === false) {
        return false;
    }
    $this->outputMode = 1;
    $this->outputFileHandle = $fh;
    $ok = $this->generateOutputPage();
    fclose($fh);
    return $ok; }

/**
* Generates the HTML page and writes it to a string.
* @param  string   $outputString  variable that receives
*                  the contents of the generated HTML page.
* @return boolean  true on success, false on error.
* @access public
*/
function generateOutputToString(&$outputString) {

    $outputString = "Error";
    $this->outputMode = 2;
    $this->outputString = "";
    if (!$this->generateOutputPage()) {
        return false;
    }
    $outputString = $this->outputString;
    return true; }

/**
* @access private
* @return boolean  true on success, false on error.
*/
function generateOutputPage() {

    if (!$this->templateValid) {$this->triggerError("Template not valid."); return false; }
    if ($this->blockTab[0]['instances'] == 0) {
            $this->addBlockByNo(0);
    }
    // add main block
    for ($blockNo = 0; $blockNo < $this->blockTabCnt; $blockNo++) {
        $btr = & $this->blockTab[$blockNo];
        $btr['currBlockInstNo'] = $btr['firstBlockInstNo']; }
    $this->outputError = false;
    $this->writeBlockInstances(0, -1);
    if ($this->outputError) {
        return false;
    }
    return true; }

/**
* Writes all instances of a block that are contained within a specific
* parent block instance.
* Called recursively.
* @access private
*/
function writeBlockInstances($blockNo, $parentInstLevel) {

    $btr = & $this->blockTab[$blockNo];
    while (!$this->outputError) {
        $blockInstNo = $btr['currBlockInstNo'];
        if ($blockInstNo == -1) {
            break;
        }
        $bitr = & $this->blockInstTab[$blockInstNo];
        if ($bitr['parentInstLevel'] < $parentInstLevel) {
                    $this->programLogicError(2);
        }
        if ($bitr['parentInstLevel'] > $parentInstLevel) {
            break;
        }
        $this->writeBlockInstance($blockInstNo);
        $btr['currBlockInstNo'] = $bitr['nextBlockInstNo']; }}

/**
* @access private
*/
function writeBlockInstance($blockInstNo) {

    $bitr = & $this->blockInstTab[$blockInstNo];
    $blockNo = $bitr['blockNo'];
    $btr = & $this->blockTab[$blockNo];
    $tPos = $btr['tPosContentsBegin'];
    $subBlockNo = $blockNo + 1;
    $varRefNo = $btr['firstVarRefNo'];
    while (!$this->outputError) {
        $tPos2 = $btr['tPosContentsEnd'];
        $kind = 0; // assume end-of-block
        if ($varRefNo != -1 && $varRefNo < $this->varRefTabCnt) {  // check for variable reference
            $vrtr = & $this->varRefTab[$varRefNo];
            if ($vrtr['tPosBegin'] < $tPos) {
            $varRefNo += 1;
            continue; }
            if ($vrtr['tPosBegin'] < $tPos2) {
            $tPos2 = $vrtr['tPosBegin'];
            $kind = 1; }}
        if ($subBlockNo < $this->blockTabCnt) {   // check for subblock
            $subBtr = & $this->blockTab[$subBlockNo];
            if ($subBtr['tPosBegin'] < $tPos) {
            $subBlockNo += 1;
            continue; }
            if ($subBtr['tPosBegin'] < $tPos2) {
            $tPos2 = $subBtr['tPosBegin'];
            $kind = 2; }}
        if ($tPos2 > $tPos) {
                    $this->writeString(substr($this->template, $tPos, $tPos2 - $tPos));
        }
        switch ($kind) {
        case 0:         // end of block
        return;
        case 1:         // variable
        $vrtr = & $this->varRefTab[$varRefNo];
        if ($vrtr['blockNo'] != $blockNo) {
                    $this->programLogicError(4);
        }
        $variableValue = $bitr['blockVarTab'][$vrtr['blockVarNo']];
        $this->writeString($variableValue);
        $tPos = $vrtr['tPosEnd'];
        $varRefNo += 1;
        break;
        case 2:         // sub block
        $subBtr = & $this->blockTab[$subBlockNo];
        if ($subBtr['parentBlockNo'] != $blockNo) {
                    $this->programLogicError(3);
        }
        $this->writeBlockInstances($subBlockNo, $bitr['instanceLevel']); // recursive call
        $tPos = $subBtr['tPosEnd'];
        $subBlockNo += 1;
        break; }}}

/**
* @access private
*/
function writeString($s) {

    if ($this->outputError) {
        return;
    }
    switch ($this->outputMode) {
        case 0:
            print($s);
            break;
        case 1:
            $rc = fwrite($this->outputFileHandle, $s);
            if ($rc === false) {
                $this->outputError = true;
            }
            break;
        case 2:
            $this->outputString .= $s;
            break;
    }
}

//--- name lookup routines ------------------------------------------------------------------------------------------

/**
* Maps variable name to variable number.
* @return boolean  true on success, false if the variable is not found.
* @access private
*/
function lookupVariableName($varName, &$varNo) {

    $x = & $this->varNameToNoMap[strtoupper($varName)];
    if (!isset($x)) {
        return false;
    }
    $varNo = $x;
    return true; }

/**
* Maps block name to block number.
* If there are multiple blocks with the same name, the block number of the last
* registered block with that name is returned.
* @return boolean  true on success, false when the block is not found.
* @access private
*/
function lookupBlockName($blockName, &$blockNo) {

    $x = & $this->blockNameToNoMap[strtoupper($blockName)];
    if (!isset($x)) {
        return false;
    }
    $blockNo = $x;
    return true; }

//--- general utility routines -----------------------------------------------------------------------------------------

/**
* Reads a file into a string.
* @return boolean  true on success, false on error.
* @access private
*/
function readFileIntoString($fileName, &$s) {

    if (function_exists('version_compare') && version_compare(phpversion(), "4.3.0", ">=")) {
        $s = file_get_contents($fileName);
        if ($s === false) {
            return false;
        }
        return true; }
    $fh = fopen($fileName, "rb");
    if ($fh === false) {
        return false;
    }
    $fileSize = filesize($fileName);
    if ($fileSize === false) {fclose($fh); return false; }
    $s = fread($fh, $fileSize);
    fclose($fh);
    if (strlen($s) != $fileSize) {
        return false;
    }
    return true; }

/**
* @access private
* @return boolean  true on success, false when the end of the string is reached.
*/
function parseWord($s, &$p, &$w) {

    $sLen = strlen($s);
    while ($p < $sLen && ord($s{$p}) <= 32) {
        $p++;
    }
    if ($p >= $sLen) {
        return false;
    }
    $p0 = $p;
    while ($p < $sLen && ord($s{$p}) > 32) {
        $p++;
    }
    $w = substr($s, $p0, $p - $p0);
    return true; }

/**
* @access private
* @return boolean  true on success, false on error.
*/
function parseQuotedString($s, &$p, &$w) {

    $sLen = strlen($s);
    while ($p < $sLen && ord($s{$p}) <= 32) {
        $p++;
    }
    if ($p >= $sLen) {
        return false;
    }
    if (substr($s, $p, 1) != '"') {
        return false;
    }
    $p++; $p0 = $p;
    while ($p < $sLen && $s{$p} != '"') {
        $p++;
    }
    if ($p >= $sLen) {
        return false;
    }
    $w = substr($s, $p0, $p - $p0);
    $p++;
    return true; }

/**
* @access private
* @return boolean  true on success, false on error.
*/
function parseWordOrQuotedString($s, &$p, &$w) {

    $sLen = strlen($s);
    while ($p < $sLen && ord($s{$p}) <= 32) {
        $p++;
    }
    if ($p >= $sLen) {
        return false;
    }
    if (substr($s, $p, 1) == '"') {
            return $this->parseQuotedString($s, $p, $w);
    } else {
            return $this->parseWord($s, $p, $w);
    }
    }

/**
* Combine two file system paths.
* @access private
*/
function combineFileSystemPath($path1, $path2) {

    if ($path1 == '' || $path2 == '') {
        return $path2;
    }
    $s = $path1;
    if (substr($s, -1) != '\\' && substr($s, -1) != '/') {
        $s = $s."/";
    }
    if (substr($path2, 0, 1) == '\\' || substr($path2, 0, 1) == '/') {
            $s = $s.substr($path2, 1);
    } else {
            $s = $s.$path2;
    }
    return $s; }

/**
* @access private
*/
function triggerError($msg) {

    trigger_error("MiniTemplator error: $msg", E_USER_ERROR); }

/**
* @access private
*/
function programLogicError($errorId) {

    die ("MiniTemplator: Program logic error $errorId.\n"); }


}
?>


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