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提交 fcdf1df2 编写于 作者: J Jonathan Corbet
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Merge branch 'kerneldoc2' into docs-next 

So once upon a time I set out to fix the problem reported by Tobin wherein
a literal block within a kerneldoc comment would be corrupted in
processing.  On the way, though, I got annoyed at the way I have to learn
how kernel-doc works from the beginning every time I tear into it.

As a result, seven of the following eight patches just get rid of some dead
code and reorganize the rest - mostly turning the 500-line process_file()
function into something a bit more rational.  Sphinx output is unchanged
after these are applied.  Then, at the end, there's a tweak to stop messing
with literal blocks.

If anybody was unaware that I've not done any serious Perl since the
1990's, they will certainly understand that fact now.
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scripts/kernel-doc
浏览文件 @ fcdf1df2
#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0
use warnings;
use strict;
......@@ -328,13 +329,15 @@ my $lineprefix="";
use constant {
STATE_NORMAL => 0, # normal code
STATE_NAME => 1, # looking for function name
STATE_FIELD => 2, # scanning field start
STATE_PROTO => 3, # scanning prototype
STATE_DOCBLOCK => 4, # documentation block
STATE_INLINE => 5, # gathering documentation outside main block
STATE_BODY_MAYBE => 2, # body - or maybe more description
STATE_BODY => 3, # the body of the comment
STATE_PROTO => 4, # scanning prototype
STATE_DOCBLOCK => 5, # documentation block
STATE_INLINE => 6, # gathering documentation outside main block
};
my $state;
my $in_doc_sect;
my $leading_space;
# Inline documentation state
use constant {
......@@ -553,10 +556,9 @@ sub output_highlight {
}
if ($line eq ""){
if (! $output_preformatted) {
print $lineprefix, local_unescape($blankline);
print $lineprefix, $blankline;
}
} else {
$line =~ s/\\\\\\/\&/g;
if ($output_mode eq "man" && substr($line, 0, 1) eq ".") {
print "\\&$line";
} else {
......@@ -747,17 +749,73 @@ sub output_blockhead_rst(%) {
}
}
sub output_highlight_rst {
my $contents = join "\n",@_;
my $line;
# undo the evil effects of xml_escape() earlier
$contents = xml_unescape($contents);
#
# Apply the RST highlights to a sub-block of text.
#
sub highlight_block($) {
# The dohighlight kludge requires the text be called $contents
my $contents = shift;
eval $dohighlight;
die $@ if $@;
return $contents;
}
foreach $line (split "\n", $contents) {
#
# Regexes used only here.
#
my $sphinx_literal = '^[^.].*::$';
my $sphinx_cblock = '^\.\.\ +code-block::';
sub output_highlight_rst {
my $input = join "\n",@_;
my $output = "";
my $line;
my $in_literal = 0;
my $litprefix;
my $block = "";
foreach $line (split "\n",$input) {
#
# If we're in a literal block, see if we should drop out
# of it. Otherwise pass the line straight through unmunged.
#
if ($in_literal) {
if (! ($line =~ /^\s*$/)) {
#
# If this is the first non-blank line in a literal
# block we need to figure out what the proper indent is.
#
if ($litprefix eq "") {
$line =~ /^(\s*)/;
$litprefix = '^' . $1;
$output .= $line . "\n";
} elsif (! ($line =~ /$litprefix/)) {
$in_literal = 0;
} else {
$output .= $line . "\n";
}
} else {
$output .= $line . "\n";
}
}
#
# Not in a literal block (or just dropped out)
#
if (! $in_literal) {
$block .= $line . "\n";
if (($line =~ /$sphinx_literal/) || ($line =~ /$sphinx_cblock/)) {
$in_literal = 1;
$litprefix = "";
$output .= highlight_block($block);
$block = ""
}
}
}
if ($block) {
$output .= highlight_block($block);
}
foreach $line (split "\n", $output) {
print $lineprefix . $line . "\n";
}
}
......@@ -1422,8 +1480,6 @@ sub push_parameter($$$$) {
}
}
$param = xml_escape($param);
# strip spaces from $param so that it is one continuous string
# on @parameterlist;
# this fixes a problem where check_sections() cannot find
......@@ -1748,47 +1804,6 @@ sub process_proto_type($$) {
}
}
# xml_escape: replace <, >, and & in the text stream;
#
# however, formatting controls that are generated internally/locally in the
# kernel-doc script are not escaped here; instead, they begin life like
# $blankline_html (4 of '\' followed by a mnemonic + ':'), then these strings
# are converted to their mnemonic-expected output, without the 4 * '\' & ':',
# just before actual output; (this is done by local_unescape())
sub xml_escape($) {
my $text = shift;
if ($output_mode eq "man") {
return $text;
}
$text =~ s/\&/\\\\\\amp;/g;
$text =~ s/\</\\\\\\lt;/g;
$text =~ s/\>/\\\\\\gt;/g;
return $text;
}
# xml_unescape: reverse the effects of xml_escape
sub xml_unescape($) {
my $text = shift;
if ($output_mode eq "man") {
return $text;
}
$text =~ s/\\\\\\amp;/\&/g;
$text =~ s/\\\\\\lt;/</g;
$text =~ s/\\\\\\gt;/>/g;
return $text;
}
# convert local escape strings to html
# local escape strings look like: '\\\\menmonic:' (that's 4 backslashes)
sub local_unescape($) {
my $text = shift;
if ($output_mode eq "man") {
return $text;
}
$text =~ s/\\\\\\\\lt:/</g;
$text =~ s/\\\\\\\\gt:/>/g;
return $text;
}
sub map_filename($) {
my $file;
......@@ -1826,15 +1841,291 @@ sub process_export_file($) {
close(IN);
}
sub process_file($) {
my $file;
#
# Parsers for the various processing states.
#
# STATE_NORMAL: looking for the /** to begin everything.
#
sub process_normal() {
if (/$doc_start/o) {
$state = STATE_NAME; # next line is always the function name
$in_doc_sect = 0;
$declaration_start_line = $. + 1;
}
}
#
# STATE_NAME: Looking for the "name - description" line
#
sub process_name($$) {
my $file = shift;
my $identifier;
my $func;
my $descr;
my $in_purpose = 0;
if (/$doc_block/o) {
$state = STATE_DOCBLOCK;
$contents = "";
$new_start_line = $. + 1;
if ( $1 eq "" ) {
$section = $section_intro;
} else {
$section = $1;
}
}
elsif (/$doc_decl/o) {
$identifier = $1;
if (/\s*([\w\s]+?)(\(\))?\s*-/) {
$identifier = $1;
}
$state = STATE_BODY;
# if there's no @param blocks need to set up default section
# here
$contents = "";
$section = $section_default;
$new_start_line = $. + 1;
if (/-(.*)/) {
# strip leading/trailing/multiple spaces
$descr= $1;
$descr =~ s/^\s*//;
$descr =~ s/\s*$//;
$descr =~ s/\s+/ /g;
$declaration_purpose = $descr;
$state = STATE_BODY_MAYBE;
} else {
$declaration_purpose = "";
}
if (($declaration_purpose eq "") && $verbose) {
print STDERR "${file}:$.: warning: missing initial short description on line:\n";
print STDERR $_;
++$warnings;
}
if ($identifier =~ m/^struct/) {
$decl_type = 'struct';
} elsif ($identifier =~ m/^union/) {
$decl_type = 'union';
} elsif ($identifier =~ m/^enum/) {
$decl_type = 'enum';
} elsif ($identifier =~ m/^typedef/) {
$decl_type = 'typedef';
} else {
$decl_type = 'function';
}
if ($verbose) {
print STDERR "${file}:$.: info: Scanning doc for $identifier\n";
}
} else {
print STDERR "${file}:$.: warning: Cannot understand $_ on line $.",
" - I thought it was a doc line\n";
++$warnings;
$state = STATE_NORMAL;
}
}
#
# STATE_BODY and STATE_BODY_MAYBE: the bulk of a kerneldoc comment.
#
sub process_body($$) {
my $file = shift;
if (/$doc_sect/i) { # case insensitive for supported section names
$newsection = $1;
$newcontents = $2;
# map the supported section names to the canonical names
if ($newsection =~ m/^description$/i) {
$newsection = $section_default;
} elsif ($newsection =~ m/^context$/i) {
$newsection = $section_context;
} elsif ($newsection =~ m/^returns?$/i) {
$newsection = $section_return;
} elsif ($newsection =~ m/^\@return$/) {
# special: @return is a section, not a param description
$newsection = $section_return;
}
if (($contents ne "") && ($contents ne "\n")) {
if (!$in_doc_sect && $verbose) {
print STDERR "${file}:$.: warning: contents before sections\n";
++$warnings;
}
dump_section($file, $section, $contents);
$section = $section_default;
}
$in_doc_sect = 1;
$state = STATE_BODY;
$contents = $newcontents;
$new_start_line = $.;
while (substr($contents, 0, 1) eq " ") {
$contents = substr($contents, 1);
}
if ($contents ne "") {
$contents .= "\n";
}
$section = $newsection;
$leading_space = undef;
} elsif (/$doc_end/) {
if (($contents ne "") && ($contents ne "\n")) {
dump_section($file, $section, $contents);
$section = $section_default;
$contents = "";
}
# look for doc_com + <text> + doc_end:
if ($_ =~ m'\s*\*\s*[a-zA-Z_0-9:\.]+\*/') {
print STDERR "${file}:$.: warning: suspicious ending line: $_";
++$warnings;
}
$prototype = "";
$state = STATE_PROTO;
$brcount = 0;
} elsif (/$doc_content/) {
# miguel-style comment kludge, look for blank lines after
# @parameter line to signify start of description
if ($1 eq "") {
if ($section =~ m/^@/ || $section eq $section_context) {
dump_section($file, $section, $contents);
$section = $section_default;
$contents = "";
$new_start_line = $.;
} else {
$contents .= "\n";
}
$state = STATE_BODY;
} elsif ($state == STATE_BODY_MAYBE) {
# Continued declaration purpose
chomp($declaration_purpose);
$declaration_purpose .= " " . $1;
$declaration_purpose =~ s/\s+/ /g;
} else {
my $cont = $1;
if ($section =~ m/^@/ || $section eq $section_context) {
if (!defined $leading_space) {
if ($cont =~ m/^(\s+)/) {
$leading_space = $1;
} else {
$leading_space = "";
}
}
$cont =~ s/^$leading_space//;
}
$contents .= $cont . "\n";
}
} else {
# i dont know - bad line? ignore.
print STDERR "${file}:$.: warning: bad line: $_";
++$warnings;
}
}
#
# STATE_PROTO: reading a function/whatever prototype.
#
sub process_proto($$) {
my $file = shift;
if (/$doc_inline_oneline/) {
$section = $1;
$contents = $2;
if ($contents ne "") {
$contents .= "\n";
dump_section($file, $section, $contents);
$section = $section_default;
$contents = "";
}
} elsif (/$doc_inline_start/) {
$state = STATE_INLINE;
$inline_doc_state = STATE_INLINE_NAME;
} elsif ($decl_type eq 'function') {
process_proto_function($_, $file);
} else {
process_proto_type($_, $file);
}
}
#
# STATE_DOCBLOCK: within a DOC: block.
#
sub process_docblock($$) {
my $file = shift;
if (/$doc_end/) {
dump_doc_section($file, $section, $contents);
$section = $section_default;
$contents = "";
$function = "";
%parameterdescs = ();
%parametertypes = ();
@parameterlist = ();
%sections = ();
@sectionlist = ();
$prototype = "";
$state = STATE_NORMAL;
} elsif (/$doc_content/) {
if ( $1 eq "" ) {
$contents .= $blankline;
} else {
$contents .= $1 . "\n";
}
}
}
#
# STATE_INLINE: docbook comments within a prototype.
#
sub process_inline($$) {
my $file = shift;
# First line (state 1) needs to be a @parameter
if ($inline_doc_state == STATE_INLINE_NAME && /$doc_inline_sect/o) {
$section = $1;
$contents = $2;
$new_start_line = $.;
if ($contents ne "") {
while (substr($contents, 0, 1) eq " ") {
$contents = substr($contents, 1);
}
$contents .= "\n";
}
$inline_doc_state = STATE_INLINE_TEXT;
# Documentation block end */
} elsif (/$doc_inline_end/) {
if (($contents ne "") && ($contents ne "\n")) {
dump_section($file, $section, $contents);
$section = $section_default;
$contents = "";
}
$state = STATE_PROTO;
$inline_doc_state = STATE_INLINE_NA;
# Regular text
} elsif (/$doc_content/) {
if ($inline_doc_state == STATE_INLINE_TEXT) {
$contents .= $1 . "\n";
# nuke leading blank lines
if ($contents =~ /^\s*$/) {
$contents = "";
}
} elsif ($inline_doc_state == STATE_INLINE_NAME) {
$inline_doc_state = STATE_INLINE_ERROR;
print STDERR "${file}:$.: warning: ";
print STDERR "Incorrect use of kernel-doc format: $_";
++$warnings;
}
}
}
sub process_file($) {
my $file;
my $initial_section_counter = $section_counter;
my ($orig_file) = @_;
my $leading_space;
$file = map_filename($orig_file);
......@@ -1853,250 +2144,23 @@ sub process_file($) {
}
# Replace tabs by spaces
while ($_ =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {};
# Hand this line to the appropriate state handler
if ($state == STATE_NORMAL) {
if (/$doc_start/o) {
$state = STATE_NAME; # next line is always the function name
$in_doc_sect = 0;
$declaration_start_line = $. + 1;
}
} elsif ($state == STATE_NAME) {# this line is the function name (always)
if (/$doc_block/o) {
$state = STATE_DOCBLOCK;
$contents = "";
$new_start_line = $. + 1;
if ( $1 eq "" ) {
$section = $section_intro;
} else {
$section = $1;
}
}
elsif (/$doc_decl/o) {
$identifier = $1;
if (/\s*([\w\s]+?)(\(\))?\s*-/) {
$identifier = $1;
}
$state = STATE_FIELD;
# if there's no @param blocks need to set up default section
# here
$contents = "";
$section = $section_default;
$new_start_line = $. + 1;
if (/-(.*)/) {
# strip leading/trailing/multiple spaces
$descr= $1;
$descr =~ s/^\s*//;
$descr =~ s/\s*$//;
$descr =~ s/\s+/ /g;
$declaration_purpose = xml_escape($descr);
$in_purpose = 1;
} else {
$declaration_purpose = "";
}
if (($declaration_purpose eq "") && $verbose) {
print STDERR "${file}:$.: warning: missing initial short description on line:\n";
print STDERR $_;
++$warnings;
}
if ($identifier =~ m/^struct/) {
$decl_type = 'struct';
} elsif ($identifier =~ m/^union/) {
$decl_type = 'union';
} elsif ($identifier =~ m/^enum/) {
$decl_type = 'enum';
} elsif ($identifier =~ m/^typedef/) {
$decl_type = 'typedef';
} else {
$decl_type = 'function';
}
if ($verbose) {
print STDERR "${file}:$.: info: Scanning doc for $identifier\n";
}
} else {
print STDERR "${file}:$.: warning: Cannot understand $_ on line $.",
" - I thought it was a doc line\n";
++$warnings;
$state = STATE_NORMAL;
}
} elsif ($state == STATE_FIELD) { # look for head: lines, and include content
if (/$doc_sect/i) { # case insensitive for supported section names
$newsection = $1;
$newcontents = $2;
# map the supported section names to the canonical names
if ($newsection =~ m/^description$/i) {
$newsection = $section_default;
} elsif ($newsection =~ m/^context$/i) {
$newsection = $section_context;
} elsif ($newsection =~ m/^returns?$/i) {
$newsection = $section_return;
} elsif ($newsection =~ m/^\@return$/) {
# special: @return is a section, not a param description
$newsection = $section_return;
}
if (($contents ne "") && ($contents ne "\n")) {
if (!$in_doc_sect && $verbose) {
print STDERR "${file}:$.: warning: contents before sections\n";
++$warnings;
}
dump_section($file, $section, xml_escape($contents));
$section = $section_default;
}
$in_doc_sect = 1;
$in_purpose = 0;
$contents = $newcontents;
$new_start_line = $.;
while (substr($contents, 0, 1) eq " ") {
$contents = substr($contents, 1);
}
if ($contents ne "") {
$contents .= "\n";
}
$section = $newsection;
$leading_space = undef;
} elsif (/$doc_end/) {
if (($contents ne "") && ($contents ne "\n")) {
dump_section($file, $section, xml_escape($contents));
$section = $section_default;
$contents = "";
}
# look for doc_com + <text> + doc_end:
if ($_ =~ m'\s*\*\s*[a-zA-Z_0-9:\.]+\*/') {
print STDERR "${file}:$.: warning: suspicious ending line: $_";
++$warnings;
}
$prototype = "";
$state = STATE_PROTO;
$brcount = 0;
# print STDERR "end of doc comment, looking for prototype\n";
} elsif (/$doc_content/) {
# miguel-style comment kludge, look for blank lines after
# @parameter line to signify start of description
if ($1 eq "") {
if ($section =~ m/^@/ || $section eq $section_context) {
dump_section($file, $section, xml_escape($contents));
$section = $section_default;
$contents = "";
$new_start_line = $.;
} else {
$contents .= "\n";
}
$in_purpose = 0;
} elsif ($in_purpose == 1) {
# Continued declaration purpose
chomp($declaration_purpose);
$declaration_purpose .= " " . xml_escape($1);
$declaration_purpose =~ s/\s+/ /g;
} else {
my $cont = $1;
if ($section =~ m/^@/ || $section eq $section_context) {
if (!defined $leading_space) {
if ($cont =~ m/^(\s+)/) {
$leading_space = $1;
} else {
$leading_space = "";
}
}
$cont =~ s/^$leading_space//;
}
$contents .= $cont . "\n";
}
} else {
# i dont know - bad line? ignore.
print STDERR "${file}:$.: warning: bad line: $_";
++$warnings;
}
process_normal();
} elsif ($state == STATE_NAME) {
process_name($file, $_);
} elsif ($state == STATE_BODY || $state == STATE_BODY_MAYBE) {
process_body($file, $_);
} elsif ($state == STATE_INLINE) { # scanning for inline parameters
# First line (state 1) needs to be a @parameter
if ($inline_doc_state == STATE_INLINE_NAME && /$doc_inline_sect/o) {
$section = $1;
$contents = $2;
$new_start_line = $.;
if ($contents ne "") {
while (substr($contents, 0, 1) eq " ") {
$contents = substr($contents, 1);
}
$contents .= "\n";
}
$inline_doc_state = STATE_INLINE_TEXT;
# Documentation block end */
} elsif (/$doc_inline_end/) {
if (($contents ne "") && ($contents ne "\n")) {
dump_section($file, $section, xml_escape($contents));
$section = $section_default;
$contents = "";
}
$state = STATE_PROTO;
$inline_doc_state = STATE_INLINE_NA;
# Regular text
} elsif (/$doc_content/) {
if ($inline_doc_state == STATE_INLINE_TEXT) {
$contents .= $1 . "\n";
# nuke leading blank lines
if ($contents =~ /^\s*$/) {
$contents = "";
}
} elsif ($inline_doc_state == STATE_INLINE_NAME) {
$inline_doc_state = STATE_INLINE_ERROR;
print STDERR "${file}:$.: warning: ";
print STDERR "Incorrect use of kernel-doc format: $_";
++$warnings;
}
}
} elsif ($state == STATE_PROTO) { # scanning for function '{' (end of prototype)
if (/$doc_inline_oneline/) {
$section = $1;
$contents = $2;
if ($contents ne "") {
$contents .= "\n";
dump_section($file, $section, xml_escape($contents));
$section = $section_default;
$contents = "";
}
} elsif (/$doc_inline_start/) {
$state = STATE_INLINE;
$inline_doc_state = STATE_INLINE_NAME;
} elsif ($decl_type eq 'function') {
process_proto_function($_, $file);
} else {
process_proto_type($_, $file);
}
process_inline($file, $_);
} elsif ($state == STATE_PROTO) {
process_proto($file, $_);
} elsif ($state == STATE_DOCBLOCK) {
if (/$doc_end/)
{
dump_doc_section($file, $section, xml_escape($contents));
$section = $section_default;
$contents = "";
$function = "";
%parameterdescs = ();
%parametertypes = ();
@parameterlist = ();
%sections = ();
@sectionlist = ();
$prototype = "";
$state = STATE_NORMAL;
}
elsif (/$doc_content/)
{
if ( $1 eq "" )
{
$contents .= $blankline;
}
else
{
$contents .= $1 . "\n";
}
}
process_docblock($file, $_);
}
}
# Make sure we got something interesting.
if ($initial_section_counter == $section_counter) {
if ($output_mode ne "none") {
print STDERR "${file}:1: warning: no structured comments found\n";
......
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