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+#+TITLE: sdp read markup source
+#+AUTHOR: Ralph Amissah
+#+EMAIL: ralph.amissah@gmail.com
+#+STARTUP: indent
+#+LANGUAGE: en
+#+OPTIONS: H:3 num:nil toc:t \n:nil @:t ::t |:t ^:nil -:t f:t *:t <:t
+#+OPTIONS: TeX:t LaTeX:t skip:nil d:nil todo:t pri:nil tags:not-in-toc
+#+OPTIONS: author:nil email:nil creator:nil timestamp:nil
+#+OPTIONS: ^:nil _:nil
+#+EXPORT_SELECT_TAGS: export
+#+EXPORT_EXCLUDE_TAGS: noexport
+#+FILETAGS: :sdp:rel:ao:
+#+TAGS: assert(a) class(c) debug(d) mixin(m) sdp(s) tangle(T) template(t) WEB(W) noexport(n)
+
+* read markup source                                                 :markup:
+[[./sdp.org][sdp]]  [[./][org/]]
+
+** source string                                                     :string:
+#+name: ao_read_markup_source
+#+BEGIN_SRC d                                                  :exports none
+final private string markupSourceString(in char[] fn_src) {
+  enforce(
+    exists(fn_src)!=0,
+    "file not found"
+  );
+  string source_txt_str;
+  try {
+    if (exists(fn_src)) {
+      source_txt_str = readText(fn_src); // ok
+    }
+  }
+  catch (ErrnoException ex) {
+    // Handle errors
+  }
+  catch (UTFException ex) {
+    // Handle validation errors
+  }
+  catch (FileException ex) {
+    // Handle errors
+  }
+  std.utf.validate(source_txt_str);
+  return source_txt_str;
+}
+#+END_SRC
+
+** source line array                                                  :array:
+#+name: ao_read_markup_source
+#+BEGIN_SRC d                                                  :exports none
+final private char[][] markupSourceLineArray(in string src_text) {
+  char[][] source_line_arr =
+    split(cast(char[]) src_text, rgx.line_delimiter);
+  return source_line_arr;
+}
+#+END_SRC
+
+** insert source content raw line array                               :array:
+#+name: ao_read_markup_source
+#+BEGIN_SRC d                                                  :exports none
+final char[][] markupInsertSourceContentRawLineArray(in char[] fn_src) {
+  enforce(
+    match(fn_src, rgx.src_fn_find_inserts),
+    "not a sisu markup filename"
+  );
+  auto source_txt_str = markupSourceString(fn_src);
+  auto source_line_arr = markupSourceLineArray(source_txt_str);
+  return source_line_arr;
+}
+#+END_SRC
+
+** source content raw line array                                      :array:
+#+name: ao_read_markup_source
+#+BEGIN_SRC d                                                  :exports none
+final char[][] markupSourceContentRawLineArray(in char[] fn_src) {
+  enforce(
+    match(fn_src, rgx.src_pth),
+    "not a sisu markup filename"
+  );
+  auto source_txt_str = markupSourceString(fn_src);
+  auto source_line_arr = markupSourceLineArray(source_txt_str);
+  return source_line_arr;
+}
+#+END_SRC
+
+* tangles                                                            :tangle:
+** code structure:                                   :ao_read_markup_source.d:
+#+name: tangle_ao_read_markup_source
+#+BEGIN_SRC d :tangle ../lib/sdp/ao_read_markup_source.d :padline no :exports none :noweb yes
+/*
+  read markup source
+  ao_read_markup_source.d
+*/
+mixin template SiSUmarkupRaw() {
+  class MarkupRaw {
+    auto rgx = new Rgx();
+    <<ao_read_markup_source>>
+  }
+}
+#+END_SRC