public function assemble(ColumnMetaData $column) {
$expression = NULL;
if ($column->persistence == FormulaMetaData::PERSISTENCE__CALCULATED) {
$this->columnAssemblingStack = array();
array_push($this->columnAssemblingStack, $column->name);
try {
if (!isset($column->source)) {
throw new IllegalStateException(t('Formula expression is not provided'));
}
$language = isset($column->expressionLanguage) ? $column->expressionLanguage : NULL;
$parser = new FormulaExpressionParser($language);
$expression = $parser->expressionLanguageHandler->clean($column->source);
$expression = $parser->parse($expression, array($this, 'replaceColumnNames'));
$expression = $parser->insertMarker('', 0, $expression, TRUE);
$lexemes = $parser->expressionLanguageHandler->lex($expression);
$syntaxTree = $parser->expressionLanguageHandler->parse($lexemes);
$expression = $parser->expressionLanguageHandler->generate($syntaxTree);
}
catch (Exception $e) {
LogHelper::log_error($e);
throw new IllegalStateException(t(
"Cannot assemble expression for %columnName formula: %error",
array('%columnName' => $column->publicName, '%error' => $e->getMessage())));
}
array_pop($this->columnAssemblingStack);
}
else {
$expression = $column->name;
}
return $expression;
}