Make start/end in libxml-parse-html-region optional

* doc/lispref/text.texi (Parsing HTML/XML): Adjust.

* src/xml.c (parse_region): Default start/end to point-min/point-max.
(Flibxml_parse_html_region, Flibxml_parse_xml_region): Make
start/end optional.

2 files changed, 19 insertions, 4 deletions

diff --git a/doc/lispref/text.texi b/doc/lispref/text.texi
index c2161b9341d..8b859042ad0 100644
--- a/doc/lispref/text.texi
+++ b/doc/lispref/text.texi
@@ -5473,12 +5473,15 @@ available in this Emacs session.
 When libxml2 support is available, the following functions can be used
 to parse HTML or XML text into Lisp object trees.
 
-@defun libxml-parse-html-region start end &optional base-url discard-comments
+@defun libxml-parse-html-region &optional start end base-url discard-comments
 This function parses the text between @var{start} and @var{end} as
 HTML, and returns a list representing the HTML @dfn{parse tree}.  It
 attempts to handle real-world HTML by robustly coping with syntax
 mistakes.
 
+If @var{start} or @var{end} are @code{nil}, they default to the values
+from @code{point-min} and @code{point-max}, respectively.
+
 The optional argument @var{base-url}, if non-@code{nil}, should be a
 string specifying the base URL for relative URLs occurring in links.
 
@@ -5524,7 +5527,7 @@ buffer.  The argument @var{dom} should be a list as generated by
 @end defun
 
 @cindex parsing xml
-@defun libxml-parse-xml-region start end &optional base-url discard-comments
+@defun libxml-parse-xml-region &optional start end base-url discard-comments
 This function is the same as @code{libxml-parse-html-region}, except
 that it parses the text as XML rather than HTML (so it is stricter
 about syntax).
diff --git a/src/xml.c b/src/xml.c
index 522efd224c6..2cccff12331 100644
--- a/src/xml.c
+++ b/src/xml.c
@@ -186,6 +186,12 @@ parse_region (Lisp_Object start, Lisp_Object end, Lisp_Object base_url,
 
   xmlCheckVersion (LIBXML_VERSION);
 
+  if (NILP (start))
+    start = Fpoint_min ();
+
+  if (NILP (end))
+    end = Fpoint_max ();
+
   validate_region (&start, &end);
 
   istart = XFIXNUM (start);
@@ -269,8 +275,11 @@ xml_cleanup_parser (void)
 
 DEFUN ("libxml-parse-html-region", Flibxml_parse_html_region,
        Slibxml_parse_html_region,
-       2, 4, 0,
+       0, 4, 0,
        doc: /* Parse the region as an HTML document and return the parse tree.
+If START is nil, it defaults to `point-min'.  If END is nil, it
+defaults to `point-max'.
+
 If BASE-URL is non-nil, it is used to expand relative URLs.
 
 If you want comments to be stripped, use the `xml-remove-comments'
@@ -284,8 +293,11 @@ function to strip comments before calling this function.  */)
 
 DEFUN ("libxml-parse-xml-region", Flibxml_parse_xml_region,
        Slibxml_parse_xml_region,
-       2, 4, 0,
+       0, 4, 0,
        doc: /* Parse the region as an XML document and return the parse tree.
+If START is nil, it defaults to `point-min'.  If END is nil, it
+defaults to `point-max'.
+
 If BASE-URL is non-nil, it is used to expand relative URLs.
 
 If you want comments to be stripped, use the `xml-remove-comments'