From 4b5304704a5fa4cad1e5869ce97f27ff64ac492f Mon Sep 17 00:00:00 2001

From: "Richard W.M. Jones" <rjones@redhat.com>

Date: Tue, 20 Feb 2018 15:21:48 +0000

Subject: [PATCH] v2v: DOM: Add doc_to_string function.

Convert a document to an in-memory string.

(cherry picked from commit 802c8635cc2537a7d4b7af8981c670e2fdbb2675)

---

 v2v/DOM.ml  | 61 +++++++++++++++++++++++++++++++++--------------------

 v2v/DOM.mli |  3 +++

 2 files changed, 41 insertions(+), 23 deletions(-)

diff --git a/v2v/DOM.ml b/v2v/DOM.ml

index 7f66e0920..8b106224b 100644

--- a/v2v/DOM.ml

+++ b/v2v/DOM.ml

@@ -46,43 +46,48 @@ let e name attrs children =

  * we will be writing, ie. libvirt XML and OVF metadata, where

  * whitespace is generally not significant, but readability is useful.

  *)

-let rec node_to_chan ?(indent = 0) chan = function

-  | PCData str -> output_string chan (xml_quote_pcdata str)

+let rec node_to_buf ?(indent = 0) buf = function

+  | PCData str ->

+     Buffer.add_string buf (xml_quote_pcdata str)

   | Comment str ->

-    output_spaces chan indent;

-    fprintf chan "" (xml_quote_pcdata str)

-  | Element e -> element_to_chan ~indent chan e

-and element_to_chan ?(indent = 0) chan

+     buffer_add_spaces buf indent;

+     bprintf buf "" (xml_quote_pcdata str)

+  | Element e ->

+     element_to_buf ~indent buf e

+and element_to_buf ?(indent = 0) buf

     { e_name = name; e_attrs = attrs; e_children = children } =

-  output_spaces chan indent;

-  fprintf chan "<%s" name;

-  List.iter (fun (n, v) -> fprintf chan " %s='%s'" n (xml_quote_attr v)) attrs;

+  buffer_add_spaces buf indent;

+  bprintf buf "<%s" name;

+  List.iter (fun (n, v) -> bprintf buf " %s='%s'" n (xml_quote_attr v)) attrs;

   if children <> [] then (

-    output_string chan ">";

+    Buffer.add_string buf ">";

     let last_child_was_element = ref false in

     List.iter (

       function

       | Element _ as child ->

         last_child_was_element := true;

-        output_char chan '\n';

-        node_to_chan ~indent:(indent+2) chan child;

+        Buffer.add_char buf '\n';

+        node_to_buf ~indent:(indent+2) buf child;

       | PCData _ as child ->

         last_child_was_element := false;

-        node_to_chan ~indent:(indent+2) chan child;

+        node_to_buf ~indent:(indent+2) buf child;

       | Comment _ as child ->

         last_child_was_element := true;

-        output_char chan '\n';

-        node_to_chan ~indent:(indent+2) chan child;

+        Buffer.add_char buf '\n';

+        node_to_buf ~indent:(indent+2) buf child;

     ) children;

     if !last_child_was_element then (

-      output_char chan '\n';

-      output_spaces chan indent

+      Buffer.add_char buf '\n';

+      buffer_add_spaces buf indent

     );

-    fprintf chan "</%s>" name

+    bprintf buf "</%s>" name

   ) else (

-    output_string chan "/>"

+    Buffer.add_string buf "/>"

   )

+and buffer_add_spaces buf n =

+  Buffer.add_string buf (String.spaces n)

+

 (* Quote XML <element attr='...'> content.  Note you must use single

  * quotes around the attribute.

  *)

@@ -99,10 +104,20 @@ and xml_quote_pcdata str =

   let str = String.replace str ">" ">" in

   str

-let doc_to_chan chan (Doc doc) =

-  fprintf chan "\n";

-  element_to_chan chan doc;

-  fprintf chan "\n"

+let doc_to_buf buf (Doc doc) =

+  bprintf buf "\n";

+  element_to_buf buf doc;

+  bprintf buf "\n"

+

+let doc_to_string doc =

+  let buf = Buffer.create 4096 in

+  doc_to_buf buf doc;

+  Buffer.contents buf

+

+let doc_to_chan chan doc =

+  let buf = Buffer.create 4096 in

+  doc_to_buf buf doc;

+  Buffer.output_buffer chan buf

 let path_to_nodes (Doc doc) path =

   match path with

diff --git a/v2v/DOM.mli b/v2v/DOM.mli

index 1aa89b7e7..99223c389 100644

--- a/v2v/DOM.mli

+++ b/v2v/DOM.mli

@@ -60,6 +60,9 @@ v}

 v}

 *)

+val doc_to_string : doc -> string

+(** Convert a document to a string representation. *)

+

 val doc_to_chan : out_channel -> doc -> unit

 (** Write the XML document to an output channel. *)

-- 

2.20.1