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<?php
namespace Icinga\Module\Graphite\Util;
use InvalidArgumentException;
/**
* A macro-based template for strings
*/
class MacroTemplate
{
/**
* Macros' start and end character
*
* @var string
*/
protected $macroCharacter;
/**
* The parsed template
*
* @var string[]
*/
protected $template;
/**
* Regex for reverse resolving patterns
*
* @var string
*/
protected $reverseResolvePattern;
/**
* Wildcards
*
* @var string[]
*/
protected $wildCards;
/**
* The original raw template
*
* @var string
*/
protected $orgTemplate;
/**
* Constructor
*
* @param string $template The raw template
* @param string $macroCharacter Macros' start and end character
*/
public function __construct($template, $macroCharacter = '$')
{
$this->orgTemplate = $template;
$this->macroCharacter = $macroCharacter;
$this->template = explode($macroCharacter, $template);
foreach ($this->template as $key => $value) {
if (preg_match('/([^:]+):(.+)/', $value, $match)) {
$wildCardKey = $match[1];
$this->template[$key] = $wildCardKey;
$this->wildCards[$wildCardKey] = $match[2];
}
}
if (! (count($this->template) % 2)) {
throw new InvalidArgumentException(
'template contains odd number of ' . var_export($macroCharacter, true)
. 's: ' . var_export($template, true)
);
}
}
/**
* Return a string based on this template with the macros resolved from the given variables
*
* @param string[] $variables
* @param string $default The default value for missing variables.
* By default the macro just isn't replaced.
*
* @return string
*/
public function resolve(array $variables, $default = null)
{
$macro = false;
$result = []; // kind of string builder
foreach ($this->template as $part) {
if ($macro) {
if (isset($variables[$part])) {
$result[] = $variables[$part];
} elseif ($part === '') {
$result[] = $this->macroCharacter;
} elseif ($default === null) {
$result[] = $this->macroCharacter;
$result[] = $part;
// add wildcards to result before they are
// overwritten from Template::getFullCurves()
if (isset($this->wildCards[$part])) {
$result[] = ':' . $this->wildCards[$part];
}
$result[] = $this->macroCharacter;
} else {
if (isset($this->wildCards[$part])) {
$result[] = $this->wildCards[$part];
} else {
$result[] = $default;
}
}
} else {
$result[] = $part;
}
$macro = ! $macro;
}
return implode($result);
}
/**
* Try to reverse-resolve the given string
*
* @param string $resolved A result of {@link resolve()}
*
* @return string[]|false Variables as passed to {@link resolve()} if successful
*/
public function reverseResolve($resolved)
{
$matches = [];
if (! preg_match($this->getReverseResolvePattern(), $resolved, $matches)) {
return false;
}
$macro = false;
$macros = [];
$currentCapturedSubPatternIndex = 0;
foreach ($this->template as $part) {
if ($macro && ! isset($macros[$part])) {
$macros[$part] = ++$currentCapturedSubPatternIndex;
}
$macro = ! $macro;
}
$macros = array_flip($macros);
$result = [];
foreach ($matches as $index => $match) {
if ($index > 0) {
$result[$macros[$index]] = $match;
}
}
return $result;
}
/**
* Return the raw template string this instance was constructed from
*
* @return string
*/
public function __toString()
{
return $this->orgTemplate;
}
/**
* Return the macros of this template
*
* @return string[]
*/
public function getMacros()
{
$macro = false;
$macros = [];
foreach ($this->template as $part) {
if ($macro) {
$macros[$part] = null;
}
$macro = ! $macro;
}
unset($macros['']);
return array_keys($macros);
}
/**
* Get macros' start and end character
*
* @return string
*/
public function getMacroCharacter()
{
return $this->macroCharacter;
}
/**
* Get {@link reverseResolvePattern}
*
* @return string
*/
protected function getReverseResolvePattern()
{
if ($this->reverseResolvePattern === null) {
$result = ['/\A']; // kind of string builder
$macro = false;
$macros = [];
$currentCapturedSubPatternIndex = 0;
foreach ($this->template as $part) {
if ($macro) {
if (isset($macros[$part])) {
$result[] = '\g{';
$result[] = $macros[$part];
$result[] = '}';
} else {
$macros[$part] = ++$currentCapturedSubPatternIndex;
$result[] = '(.*)';
}
} else {
$result[] = preg_quote($part, '/');
}
$macro = ! $macro;
}
$result[] = '\z/s';
$this->reverseResolvePattern = implode($result);
}
return $this->reverseResolvePattern;
}
}
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