How to parse optional arguments of environments

[larsgw]

Description

How can I parse optional arguments of environments in PhpLatex? The following LaTeX:

\begin{tabular}[t]{c}
  table content
\end{tabular}

Gets parsed as follows:

object(App\Utility\Latex\Parser\Node) id:0 {
  protected _type => 'environ'
  protected _props => [
    'mode' => (int) 1,
    'value' => 'tabular',
  ]
  protected _children => [
    (int) 0 => object(PhpLatex_Node) id:1 {
      protected _type => 'group'
      protected _props => [
        'mode' => (int) 1,
        'arg' => true,
      ]
      protected _children => [
        (int) 0 => object(PhpLatex_Node) id:2 {
          protected _type => 'text'
          protected _props => [
            'mode' => (int) 1,
            'value' => '[',
          ]
          protected _children => [ ]
        },
      ]
    },
    (int) 1 => object(PhpLatex_Node) id:3 {
      protected _type => 'text'
      protected _props => [
        'mode' => (int) 1,
        'value' => 't]',
      ]
      protected _children => [ ]
    },
    (int) 2 => object(PhpLatex_Node) id:4 {
      protected _type => 'group'
      protected _props => [
        'mode' => (int) 1,
      ]
      protected _children => [
        (int) 0 => object(PhpLatex_Node) id:5 {
          protected _type => 'text'
          protected _props => [
            'mode' => (int) 1,
            'value' => 'c',
          ]
          protected _children => [ ]
        },
      ]
    },
    (int) 3 => object(PhpLatex_Node) id:6 {
      protected _type => 'text'
      protected _props => [
        'mode' => (int) 1,
        'value' => ' table content ',
      ]
      protected _children => [ ]
    },
  ]
}

Possible Solution

Would I need to do the following?

1. Get the first child
2. Check the 'arg' => true prop
3. See it has a child of type text with value '['
4. Check the following children until one contains a text node containing the character ']'
5. Check following child nodes for whether they are also arguments

Is it not possible to parse these args in Parser::_parseArg?

Additional Context

No response

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[stale]

Closing this issue after a prolonged period of inactivity.