Typesetting Preparsed Verbatim Text/Code

Question

Assuming that I have already parsed some text verbatim, using an xparse +v argument, what is the best way to typeset the text in a way that respects the original formatting?
Note that I cannot directly typeset the text using a verbatim environment, as I need to gently preprocess the text beforehand.
I have looked at how the verbatim environment set up typesetting, though it’s not clear what parts are doing what things, and I was wondering if there were a “modern” approach using currently-available LaTeX3 tools.
Addendum: After the text is parsed with with the +v argument, it is processed by some regexes, then it is split on the endline character and stored in a sequence variable as a set of lines, so that it can be written to an external file, before typesetting.
Example code:
NewDocumentCommand myverb { +v }
  { kelly_verb:n { #1 } }

tl_new:N l__kelly_verb_body_tl
seq_new:N l__kelly_verb_lines_seq

cs_new_protected:Nn kelly_verb:n
  {
    tl_set:Nn l__kelly_verb_body_tl { #1 }
    regex_replace_all:NnN c__kelly_verb_regex { <replacement> }
      l__kelly_verb_body_tl
    kelly_set_split_lines:NV l__kelly_verb_lines_seq
      l__kelly_verb_body_tl
    seq_map_inline:Nn l__kelly_verb_lines_seq
       { iow_now:Nn g__kelly_output_iow { ##1 } }
    % Typeset here...
  }

Skillmon · Accepted Answer

An example of printing stuff in a verbatim like fashion.
documentclass[]{article}

usepackage{xparse}

ExplSyntaxOn
cs_generate_variant:Nn seq_set_split:Nnn { Nnv }
tl_new:N l_kelly_verbatim_text_tl
seq_new:N l_kelly_nolig_seq
seq_set_split:Nnv l_tmpa_seq { do } { verbatim@nolig@list }
seq_remove_all:Nn l_tmpa_seq {}
seq_map_inline:Nn l_tmpa_seq
  {
    seq_push:Nx l_kelly_nolig_seq { char_generate:nn { `#1 } { 12 } }
  }
cs_new_protected:Npx __kelly_replace_newline:n #1
  {
    tl_replace_all:Nnn exp_not:N l_kelly_verbatim_text_tl
      { char_generate:nn { 13 } { 12 } }
      { #1 }
  }
cs_new_protected:Npn __kelly_no_ligs:
  {
    seq_map_inline:Nn l_kelly_nolig_seq
      {
        tl_replace_all:Nnn l_kelly_verbatim_text_tl { ##1 }
          { mode_leave_vertical: kern c_zero_dim ##1 }
      }
  }
cs_new_protected:Npn __kelly_verbatim_output:n #1
  {
    group_begin:
    dim_set_eq:NN parindent c_zero_dim
    tl_set:Nn l_kelly_verbatim_text_tl { #1 }
    tl_replace_all:Nnn l_kelly_verbatim_text_tl { ~ } { hbox:n { ~ } }
    __kelly_replace_newline:n
      {
        mode_leave_vertical: kern c_zero_dim
        par
        mode_leave_vertical: kern c_zero_dim
      }
    __kelly_no_ligs:
    use:c { verbatim@font }
    l_kelly_verbatim_text_tl
    group_end:
  }
NewDocumentCommand MyVerbatim { +v }
  {
    % do your stuff
    __kelly_verbatim_output:n { #1 }
  }
ExplSyntaxOff

begin{document}
MyVerbatim
{
  test this verbatim  text.

new  line
aa
 ne

line
}
end{document}

Typesetting Preparsed Verbatim Text/Code

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