update rpmspec lexer, to follow modern standard

References: orbitalquark#76

lexers/rpmspec.lua

@@ -1,29 +1,47 @@
 -- Copyright 2022-2025 Matej Cepl mcepl.att.cepl.eu. See LICENSE.
 
 local lexer = lexer
-local token, word_match = lexer.token, lexer.word_match
-local P, S = lpeg.P, lpeg.S
+local C, P, R, S = lpeg.C, lpeg.P, lpeg.R, lpeg.S
 
 local lex = lexer.new(...)
 
+-- Whitespace.
+lex:add_rule('whitespace', lex:tag(lexer.WHITESPACE, lexer.space^1))
+
 -- Comments.
-lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#')))
+lex:add_rule('comment', lex:tag(lexer.COMMENT, lexer.to_eol('#')))
+
+-- Numbers (including versions)
+lex:add_rule('number', lex:tag(lexer.NUMBER, lpeg.B(lpeg.space) *
+    (lexer.number * (lexer.number +S('.+~'))^0)))
+
+-- Operators
+lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('&<>=|')))
 
 -- Strings.
-lex:add_rule('string', token(lexer.STRING, lexer.range('"')))
+lex:add_rule('string', lex:tag(lexer.STRING, lexer.range('"')))
 
 -- Keywords.
-lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
+lex:add_rule('keyword', lex:tag(lexer.KEYWORD, (lex:word_match(lexer.KEYWORD) +
+	(P('Patch') + P('Source')) * R('09')^0) * ':'))
+lex:set_word_list(lexer.KEYWORD, {
 	'Prereq', 'Summary', 'Name', 'Version', 'Packager', 'Requires', 'Recommends', 'Suggests',
 	'Supplements', 'Enhances', 'Icon', 'URL', 'Source', 'Patch', 'Prefix', 'Packager', 'Group',
 	'License', 'Release', 'BuildRoot', 'Distribution', 'Vendor', 'Provides', 'ExclusiveArch',
 	'ExcludeArch', 'ExclusiveOS', 'Obsoletes', 'BuildArch', 'BuildArchitectures', 'BuildRequires',
 	'BuildConflicts', 'BuildPreReq', 'Conflicts', 'AutoRequires', 'AutoReq', 'AutoReqProv',
 	'AutoProv', 'Epoch'
-}))
+})
 
 -- Macros
-lex:add_rule('command', token(lexer.FUNCTION, '%' * lexer.word))
+lex:add_rule('command', lex:tag(lexer.FUNCTION,
+	lexer.range(S('%$')^1 * S('{')^0 * ((lexer.alnum + S('_?'))^0), S('}')^0)))
+
+-- Constants
+lex:add_rule('constant', lex:tag(lexer.CONSTANT, lex:word_match(lexer.CONSTANT)))
+lex:set_word_list(lexer.CONSTANT, {
+    'rhel', 'fedora', 'suse_version', 'sle_version', 'x86_64'
+})
 
 lexer.property['scintillua.comment'] = '#'