The parser should generically look at Tornado "code blocks"

[jimmyhchan]

Today the peg grammar handles distinguishing between a exists section etc.

e.g.

  var tornadoBodyTypes = {
    '?': 'exists',
    '^': 'notExists',
    '#': 'section',
    '@': 'helper',
    '+': 'block',
    '<': 'inlinePartial',
    '%': 'pragma'
  };

Now that we have an AST transform pass, we should be able to push this logic out into a separate pass and keep the grammar generic.

proposal:

• a codeBlock is { followed by a codeBlockIdentifier ...
• a codeBlockIdentifier is one of backtick~!@#%^&*_+-=;,.? -- what's on a US QWERTY keyboard minus dollar, parens, braces, brackets, pipe, colon, double and single quotes, <, > and slash and back slash since these are going to be confusing or are used for other things already

issues:

• we might need to revisit what bodies are