kernel-doc: add names for states and substates

Make the state machine a bit more readable by adding constants for
parser states and inline member documentation parser substates. While at
it, rename the "split" documentation to "inline" documentation.

No functional changes.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 48 insertions, 43 deletions

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 3ad54abe0989..cb5fd248ac57 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -350,24 +350,29 @@ my $section_counter = 0;
 
 my $lineprefix="";
 
-# states
-# 0 - normal code
-# 1 - looking for function name
-# 2 - scanning field start.
-# 3 - scanning prototype.
-# 4 - documentation block
-# 5 - gathering documentation outside main block
+# Parser states
+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
+};
 my $state;
 my $in_doc_sect;
 
-# Split Doc State
-# 0 - Invalid (Before start or after finish)
-# 1 - Is started (the /** was found inside a struct)
-# 2 - The @parameter header was found, start accepting multi paragraph text.
-# 3 - Finished (the */ was found)
-# 4 - Error - Comment without header was found. Spit a warning as it's not
-#     proper kernel-doc and ignore the rest.
-my $split_doc_state;
+# Inline documentation state
+use constant {
+    STATE_INLINE_NA     => 0, # not applicable ($state != STATE_INLINE)
+    STATE_INLINE_NAME   => 1, # looking for member name (@foo:)
+    STATE_INLINE_TEXT   => 2, # looking for member documentation
+    STATE_INLINE_END    => 3, # done
+    STATE_INLINE_ERROR  => 4, # error - Comment without header was found.
+                              # Spit a warning as it's not
+                              # proper kernel-doc and ignore the rest.
+};
+my $inline_doc_state;
 
 #declaration types: can be
 # 'function', 'struct', 'union', 'enum', 'typedef'
@@ -383,9 +388,9 @@ my $doc_decl = $doc_com . '(\w+)';
 my $doc_sect = $doc_com . '([' . $doc_special . ']?[\w\s]+):(.*)';
 my $doc_content = $doc_com_body . '(.*)';
 my $doc_block = $doc_com . 'DOC:\s*(.*)?';
-my $doc_split_start = '^\s*/\*\*\s*$';
-my $doc_split_sect = '\s*\*\s*(@[\w\s]+):(.*)';
-my $doc_split_end = '^\s*\*/\s*$';
+my $doc_inline_start = '^\s*/\*\*\s*$';
+my $doc_inline_sect = '\s*\*\s*(@[\w\s]+):(.*)';
+my $doc_inline_end = '^\s*\*/\s*$';
 my $export_symbol = '^\s*EXPORT_SYMBOL(_GPL)?\s*\(\s*(\w+)\s*\)\s*;';
 
 my %constants;
@@ -2497,8 +2502,8 @@ sub reset_state {
     $struct_actual = "";
     $prototype = "";
 
-    $state = 0;
-    $split_doc_state = 0;
+    $state = STATE_NORMAL;
+    $inline_doc_state = STATE_INLINE_NA;
 }
 
 sub tracepoint_munge($) {
@@ -2707,14 +2712,14 @@ sub process_file($) {
         while (s/\\\s*$//) {
             $_ .= <IN>;
         }
-        if ($state == 0) {
+        if ($state == STATE_NORMAL) {
             if (/$doc_start/o) {
-                $state = 1;             # next line is always the function name
+                $state = STATE_NAME;    # next line is always the function name
                 $in_doc_sect = 0;
             }
-        } elsif ($state == 1) { # this line is the function name (always)
+        } elsif ($state == STATE_NAME) {# this line is the function name (always)
             if (/$doc_block/o) {
-                $state = 4;
+                $state = STATE_DOCBLOCK;
                 $contents = "";
                 if ( $1 eq "" ) {
                         $section = $section_intro;
@@ -2728,7 +2733,7 @@ sub process_file($) {
                     $identifier = $1;
                 }
 
-                $state = 2;
+                $state = STATE_FIELD;
                 if (/-(.*)/) {
                     # strip leading/trailing/multiple spaces
                     $descr= $1;
@@ -2766,9 +2771,9 @@ sub process_file($) {
                 print STDERR "${file}:$.: warning: Cannot understand $_ on line $.",
                 " - I thought it was a doc line\n";
                 ++$warnings;
-                $state = 0;
+                $state = STATE_NORMAL;
             }
-        } elsif ($state == 2) { # look for head: lines, and include content
+        } elsif ($state == STATE_FIELD) {       # look for head: lines, and include content
             if (/$doc_sect/o) {
                 $newsection = $1;
                 $newcontents = $2;
@@ -2806,7 +2811,7 @@ sub process_file($) {
                 }
 
                 $prototype = "";
-                $state = 3;
+                $state = STATE_PROTO;
                 $brcount = 0;
 #               print STDERR "end of doc comment, looking for prototype\n";
             } elsif (/$doc_content/) {
@@ -2834,9 +2839,9 @@ sub process_file($) {
                 print STDERR "${file}:$.: warning: bad line: $_";
                 ++$warnings;
             }
-        } elsif ($state == 5) { # scanning for split parameters
+        } elsif ($state == STATE_INLINE) { # scanning for inline parameters
             # First line (state 1) needs to be a @parameter
-            if ($split_doc_state == 1 && /$doc_split_sect/o) {
+            if ($inline_doc_state == STATE_INLINE_NAME && /$doc_inline_sect/o) {
                 $section = $1;
                 $contents = $2;
                 if ($contents ne "") {
@@ -2846,37 +2851,37 @@ sub process_file($) {
                     }
                 $contents .= "\n";
                 }
-                $split_doc_state = 2;
+                $inline_doc_state = STATE_INLINE_TEXT;
             # Documentation block end */
-            } elsif (/$doc_split_end/) {
+            } elsif (/$doc_inline_end/) {
                 if (($contents ne "") && ($contents ne "\n")) {
                     dump_section($file, $section, xml_escape($contents));
                     $section = $section_default;
                     $contents = "";
                 }
-                $state = 3;
-                $split_doc_state = 0;
+                $state = STATE_PROTO;
+                $inline_doc_state = STATE_INLINE_NA;
             # Regular text
             } elsif (/$doc_content/) {
-                if ($split_doc_state == 2) {
+                if ($inline_doc_state == STATE_INLINE_TEXT) {
                     $contents .= $1 . "\n";
-                } elsif ($split_doc_state == 1) {
-                    $split_doc_state = 4;
+                } elsif ($inline_doc_state == STATE_INLINE_NAME) {
+                    $inline_doc_state = STATE_INLINE_ERROR;
                     print STDERR "Warning(${file}:$.): ";
                     print STDERR "Incorrect use of kernel-doc format: $_";
                     ++$warnings;
                 }
             }
-        } elsif ($state == 3) { # scanning for function '{' (end of prototype)
-            if (/$doc_split_start/) {
-                $state = 5;
-                $split_doc_state = 1;
+        } elsif ($state == STATE_PROTO) {       # scanning for function '{' (end of prototype)
+            if (/$doc_inline_start/) {
+                $state = STATE_INLINE;
+                $inline_doc_state = STATE_INLINE_NAME;
             } elsif ($decl_type eq 'function') {
                 process_state3_function($_, $file);
             } else {
                 process_state3_type($_, $file);
             }
-        } elsif ($state == 4) {
+        } elsif ($state == STATE_DOCBLOCK) {
                 # Documentation block
                 if (/$doc_block/) {
                         dump_doc_section($file, $section, xml_escape($contents));
@@ -2907,7 +2912,7 @@ sub process_file($) {
                         %sections = ();
                         @sectionlist = ();
                         $prototype = "";
-                        $state = 0;
+                        $state = STATE_NORMAL;
                 }
                 elsif (/$doc_content/)
                 {