/**
* Creates LaTeX representation of the given document node.
*
* This method is useful when parts of the rendered document should be
* presented as the LaTeX source for processing (validating and rendering)
* by external tools, i.e. MathJaX, mathTeX or mimeTeX.
*
* @param PhpLatex_Node|array $node
* @return string
*/
public static function toLatex($node)
{
if ($node instanceof PhpLatex_Node) {
switch ($node->getType()) {
case PhpLatex_Parser::TYPE_SPECIAL:
if ($node->value === '_' || $node->value === '^') {
return $node->value . self::toLatex($node->getChildren());
}
return $node->value;
case PhpLatex_Parser::TYPE_TEXT:
// make sure text is properly escaped
$source = PhpLatex_Utils::escape($node->value);
return $source;
case PhpLatex_Parser::TYPE_GROUP:
$source = $node->optional ? '[{' : '{';
$source .= self::toLatex($node->getChildren());
$source .= $node->optional ? '}]' : '}';
return $source;
case PhpLatex_Parser::TYPE_VERBATIM:
return $node->value;
case PhpLatex_Parser::TYPE_MATH:
$source = self::toLatex($node->getChildren());
if ($node->inline) {
return '\\(' . $source . '\\)';
} else {
return '\\[' . $source . '\\]';
}
case PhpLatex_Parser::TYPE_COMMAND:
if ($node->value === '\\string') {
$value = $node->value;
foreach ($node->getChildren() as $child) {
$value .= self::toLatex($child);
}
return $value;
}
if ($node->symbol || $node->hasChildren()) {
return $node->value . self::toLatex($node->getChildren());
}
// control word, add space that was removed after
return $node->value . ' ';
case PhpLatex_Parser::TYPE_ENVIRON:
return "\\begin{" . $node->value . "}\n" . self::toLatex($node->getChildren()) . "\\end{" . $node->value . "}\n";
case PhpLatex_Parser::TYPE_DOCUMENT:
return self::toLatex($node->getChildren());
}
} elseif (is_array($node)) {
// render node list and concatenate results
$latex = '';
foreach ($node as $child) {
$latex .= self::toLatex($child);
}
return $latex;
}
}
protected function _renderStyled(PhpLatex_Node $node)
{
$typestyle = null;
if ($node->getType() === PhpLatex_Parser::TYPE_COMMAND) {
switch ($node->value) {
case '\\textbf':
$typestyle = $this->_pushTypestyle();
$typestyle->bold = true;
break;
case '\\textup':
$typestyle = $this->_pushTypestyle();
$typestyle->style = PhpLatex_Renderer_Typestyle::STYLE_NORMAL;
break;
case '\\textit':
$typestyle = $this->_pushTypestyle();
$typestyle->style = PhpLatex_Renderer_Typestyle::STYLE_ITALIC;
break;
case '\\textsl':
// slanted (oblique)
$typestyle = $this->_pushTypestyle();
$typestyle->style = PhpLatex_Renderer_Typestyle::STYLE_SLANTED;
break;
case '\\emph':
$typestyle = $this->_pushTypestyle();
$typestyle->emphasis = true;
break;
case '\\textrm':
$typestyle = $this->_pushTypestyle();
$typestyle->family = PhpLatex_Renderer_Typestyle::FAMILY_SERIF;
break;
case '\\texttt':
$typestyle = $this->_pushTypestyle();
$typestyle->family = PhpLatex_Renderer_Typestyle::FAMILY_MONO;
break;
case '\\textsf':
$typestyle = $this->_pushTypestyle();
$typestyle->family = PhpLatex_Renderer_Typestyle::FAMILY_SANS;
break;
case '\\underline':
$typestyle = $this->_pushTypestyle();
$typestyle->underline = true;
break;
case '\\textsc':
// small caps
$typestyle = $this->_pushTypestyle();
$typestyle->smallcaps = true;
break;
}
}
$render = null;
foreach ($node->getChildren() as $arg) {
$render .= $this->_renderNode($arg, self::FLAG_ARG);
}
// wrap in style difference wrt to parent typestyle
if ($typestyle) {
if (strlen($render)) {
$diff = $typestyle->diff();
if ($diff) {
$render = $this->_wrapStyle($render, $diff);
}
}
$this->_typestyle = $typestyle->pop();
}
return (string) $render;
}