[PATCH v3] scripts/kernel-doc: Adding cross-reference links to html documentation.
From: Danilo Cesar Lemes de Paula
Date: Mon Jul 13 2015 - 16:34:01 EST
Functions, Structs and Parameters definitions on kernel documentation
are pure cosmetic, it only highlights the element.
To ease the navigation in the documentation we should use <links> inside
those tags so readers can easily jump between methods directly.
This was discussed in 2014[1] and is implemented by getting a list
of <refentries> from the DocBook XML to generate a database. Then it looks
for <function>,<structnames> and <paramdef> tags that matches the ones in
the database. As it only links existent references, no broken links are
added.
[1] - lists.freedesktop.org/archives/dri-devel/2014-August/065404.html
Signed-off-by: Danilo Cesar Lemes de Paula <danilo.cesar@xxxxxxxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Stephan Mueller <smueller@xxxxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: intel-gfx <intel-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: dri-devel <dri-devel@xxxxxxxxxxxxxxxxxxxxx>
---
CHANGELOG
v3:
* Add a "XMLREF FooBar.xml" as build output to reduce build noise.
* Make kernel-doc-xml-ref ignore invalid arguments.
* Improve kernel-doc-xml-ref documentation.
Documentation/DocBook/Makefile | 42 ++++++---
scripts/kernel-doc-xml-ref | 198 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 227 insertions(+), 13 deletions(-)
create mode 100755 scripts/kernel-doc-xml-ref
diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile
index b6a6a2e..16a6d94 100644
--- a/Documentation/DocBook/Makefile
+++ b/Documentation/DocBook/Makefile
@@ -64,8 +64,9 @@ installmandocs: mandocs
###
#External programs used
-KERNELDOC = $(srctree)/scripts/kernel-doc
-DOCPROC = $(objtree)/scripts/docproc
+KERNELDOCXMLREF = $(srctree)/scripts/kernel-doc-xml-ref
+KERNELDOC = $(srctree)/scripts/kernel-doc
+DOCPROC = $(objtree)/scripts/docproc
XMLTOFLAGS = -m $(srctree)/$(src)/stylesheet.xsl
XMLTOFLAGS += --skip-validation
@@ -89,7 +90,7 @@ define rule_docproc
) > $(dir $@).$(notdir $@).cmd
endef
-%.xml: %.tmpl $(KERNELDOC) $(DOCPROC) FORCE
+%.xml: %.tmpl $(KERNELDOC) $(DOCPROC) $(KERNELDOCXMLREF) FORCE
$(call if_changed_rule,docproc)
# Tell kbuild to always build the programs
@@ -140,7 +141,19 @@ quiet_cmd_db2html = HTML $@
echo '<a HREF="$(patsubst %.html,%,$(notdir $@))/index.html"> \
$(patsubst %.html,%,$(notdir $@))</a><p>' > $@
-%.html: %.xml
+###
+# Rules to create an aux XML and .db, and use them to re-process the DocBook XML
+# to fill internal hyperlinks
+ gen_aux_xml = :
+ quiet_gen_aux_xml = echo ' XMLREF $@'
+silent_gen_aux_xml = :
+%.aux.xml: %.xml
+ @$($(quiet)gen_aux_xml)
+ @rm -rf $@
+ @(cat $< | egrep "^<refentry id" | egrep -o "\".*\"" | cut -f 2 -d \" > $<.db)
+ @$(KERNELDOCXMLREF) -db $<.db $< > $@
+
+%.html: %.aux.xml
@(which xmlto > /dev/null 2>&1) || \
(echo "*** You need to install xmlto ***"; \
exit 1)
@@ -209,15 +222,18 @@ dochelp:
###
# Temporary files left by various tools
clean-files := $(DOCBOOKS) \
- $(patsubst %.xml, %.dvi, $(DOCBOOKS)) \
- $(patsubst %.xml, %.aux, $(DOCBOOKS)) \
- $(patsubst %.xml, %.tex, $(DOCBOOKS)) \
- $(patsubst %.xml, %.log, $(DOCBOOKS)) \
- $(patsubst %.xml, %.out, $(DOCBOOKS)) \
- $(patsubst %.xml, %.ps, $(DOCBOOKS)) \
- $(patsubst %.xml, %.pdf, $(DOCBOOKS)) \
- $(patsubst %.xml, %.html, $(DOCBOOKS)) \
- $(patsubst %.xml, %.9, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.dvi, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.aux, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.tex, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.log, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.out, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.ps, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.pdf, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.html, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.9, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.aux.xml, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.xml.db, $(DOCBOOKS)) \
+ $(patsubst %.xml, %.xml, $(DOCBOOKS)) \
$(index)
clean-dirs := $(patsubst %.xml,%,$(DOCBOOKS)) man
diff --git a/scripts/kernel-doc-xml-ref b/scripts/kernel-doc-xml-ref
new file mode 100755
index 0000000..104a5a5
--- /dev/null
+++ b/scripts/kernel-doc-xml-ref
@@ -0,0 +1,198 @@
+#!/usr/bin/perl -w
+
+use strict;
+
+## Copyright (C) 2015 Intel Corporation ##
+# ##
+## This software falls under the GNU General Public License. ##
+## Please read the COPYING file for more information ##
+#
+#
+# This software reads a XML file and a list of valid interal
+# references to replace Docbook tags with links.
+#
+# The list of "valid internal references" must be one-per-line in the following format:
+# API-struct-foo
+# API-enum-bar
+# API-my-function
+#
+# The software walks over the XML file looking for xml tags representing possible references
+# to the Document. Each reference will be cross checked against the "Valid Internal Reference" list. If
+# the referece is found it replaces its content by a <link> tag.
+#
+# usage:
+# kernel-doc-xml-ref -db filename
+# xml filename > outputfile
+
+# read arguments
+if ($#ARGV != 2) {
+ usage();
+}
+
+#Holds the database filename
+my $databasefile;
+my @database;
+
+#holds the inputfile
+my $inputfile;
+my $errors = 0;
+
+my %highlights = (
+ "<function>(.*?)</function>",
+ "\"<function>\" . convert_function(\$1, \$line) . \"</function>\"",
+ "<structname>(.*?)</structname>",
+ "\"<structname>\" . convert_struct(\$1) . \"</structname>\"",
+ "<funcdef>(.*?)<function>(.*?)</function></funcdef>",
+ "\"<funcdef>\" . convert_param(\$1) . \"<function>\$2</function></funcdef>\"",
+ "<paramdef>(.*?)<parameter>(.*?)</parameter></paramdef>",
+ "\"<paramdef>\" . convert_param(\$1) . \"<parameter>\$2</parameter></paramdef>\"");
+
+while($ARGV[0] =~ m/^-(.*)/) {
+ my $cmd = shift @ARGV;
+ if ($cmd eq "-db") {
+ $databasefile = shift @ARGV
+ } else {
+ usage();
+ }
+}
+$inputfile = shift @ARGV;
+
+sub open_database {
+ open (my $handle, '<', $databasefile) or die "Cannot open $databasefile";
+ chomp(my @lines = <$handle>);
+ close $handle;
+
+ @database = @lines;
+}
+
+sub process_file {
+ open_database();
+
+ my $dohighlight;
+ foreach my $pattern (keys %highlights) {
+ $dohighlight .= "\$line =~ s:$pattern:$highlights{$pattern}:eg;\n";
+ }
+
+ open(FILE, $inputfile) or die("Could not open $inputfile") or die ("Cannot open $inputfile");
+ foreach my $line (<FILE>) {
+ eval $dohighlight;
+ print $line;
+ }
+}
+
+sub trim($_)
+{
+ my $str = $_[0];
+ $str =~ s/^\s+|\s+$//g;
+ return $str
+}
+
+sub has_key_defined($_)
+{
+ if ( grep( /^$_[0]$/, @database)) {
+ return 1;
+ }
+ return 0;
+}
+
+# Gets a <function> content and add it a hyperlink if possible.
+sub convert_function($_)
+{
+ my $arg = $_[0];
+ my $key = $_[0];
+
+ my $line = $_[1];
+
+ $key = trim($key);
+
+ $key =~ s/[^A-Za-z0-9]/-/g;
+ $key = "API-" . $key;
+
+ # We shouldn't add links to <funcdef> prototype
+ if (!has_key_defined($key) || $line =~ m/\s+<funcdef/i) {
+ return $arg;
+ }
+
+ my $head = $arg;
+ my $tail = "";
+ if ($arg =~ /(.*?)( ?)$/) {
+ $head = $1;
+ $tail = $2;
+ }
+ return "<link linkend=\"$key\">$head</link>$tail";
+}
+
+# Converting a struct text to link
+sub convert_struct($_)
+{
+ my $arg = $_[0];
+ my $key = $_[0];
+ $key =~ s/(struct )?(\w)/$2/g;
+ $key =~ s/[^A-Za-z0-9]/-/g;
+ $key = "API-struct-" . $key;
+
+ if (!has_key_defined($key)) {
+ return $arg;
+ }
+
+ my ($head, $tail) = split_pointer($arg);
+ return "<link linkend=\"$key\">$head</link>$tail";
+}
+
+# Identify "object *" elements
+sub split_pointer($_)
+{
+ my $arg = $_[0];
+ if ($arg =~ /(.*?)( ?\* ?)/) {
+ return ($1, $2);
+ }
+ return ($arg, "");
+}
+
+sub convert_param($_)
+{
+ my $type = $_[0];
+ my $keyname = convert_key_name($type);
+
+ if (!has_key_defined($keyname)) {
+ return $type;
+ }
+
+ my ($head, $tail) = split_pointer($type);
+ return "<link linkend=\"$keyname\">$head</link>$tail";
+
+}
+
+# DocBook links are in the API-<TYPE>-<STRUCT-NAME> format
+# This method gets an element and returns a valid DocBook reference for it.
+sub convert_key_name($_)
+{
+ #Pattern $2 is optional and might be uninitialized
+ no warnings 'uninitialized';
+
+ my $str = $_[0];
+ $str =~ s/(const|static)? ?(struct)? ?([a-zA-Z0-9_]+) ?(\*|&)?/$2 $3/g ;
+
+ # trim
+ $str =~ s/^\s+|\s+$//g;
+
+ # spaces and _ to -
+ $str =~ s/[^A-Za-z0-9]/-/g;
+
+ return "API-" . $str;
+}
+
+sub usage {
+ print "Usage: $0 -db database filename\n";
+ print " xml source file(s) > outputfile\n";
+ exit 1;
+}
+
+# starting point
+process_file();
+
+if ($errors) {
+ print STDERR "$errors errors\n";
+}
+
+exit($errors);
--
2.1.4
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