1 files changed, 48 insertions, 0 deletions
diff --git a/.config/vis/lexers/kdl.lua b/.config/vis/lexers/kdl.lua
new file mode 100644
index 0000000..f9d324e
--- /dev/null
+++ b/.config/vis/lexers/kdl.lua
@@ -0,0 +1,48 @@
+-- KDL LPeg lexer for vis.
+-- Covers: // and /* */ comments, slashdash /-, quoted and raw strings,
+-- type annotations (type), keywords, numbers, node/property identifiers.
+
+local lexer = lexer
+local P, S = lpeg.P, lpeg.S
+
+local lex = lexer.new(..., {fold_by_indentation = true})
+
+-- Comments.
+local line_comment = lexer.to_eol('//')
+local block_comment = lexer.range('/*', '*/', false, false, true)
+lex:add_rule('comment', lex:tag(lexer.COMMENT, line_comment + block_comment))
+
+-- Slashdash node suppression.
+lex:add_rule('slashdash', lex:tag(lexer.OPERATOR, P('/-')))
+
+-- Keywords.
+lex:add_rule('keyword', lex:tag(lexer.KEYWORD, lexer.word_match({'true', 'false', 'null'})))
+
+-- Strings: raw #"..."# first so the hash prefixes are not split off,
+-- then regular "..." strings.
+local raw_str = lexer.range(P('#')^1 * '"', '"' * P('#')^1)
+local dq_str = lexer.range('"')
+lex:add_rule('string', lex:tag(lexer.STRING, raw_str + dq_str))
+
+-- Type annotations like (path)file or (const).
+local type_ann = P('(') * lexer.word * P(')')
+lex:add_rule('type', lex:tag(lexer.TYPE, type_ann))
+
+-- Numbers (int/float/hex/oct/bin; underscores are tolerated inside).
+local num_pattern =
+	(lexer.number *
+		(S('_')^0 * lexer.number)^0) +
+	'0x' * (lpeg.R('09') + lpeg.R('af') + lpeg.R('AF') + '_')^1 +
+	'0o' * lpeg.R('07')^1 +
+	'0b' * lpeg.R('01')^1
+lex:add_rule('number', lex:tag(lexer.NUMBER, num_pattern))
+
+-- Identifiers (node names, property keys).
+lex:add_rule('identifier', lex:tag(lexer.IDENTIFIER, lexer.word))
+
+-- Operators / punctuation.
+lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('{}()=;,/+\\')))
+
+lexer.property['scintillua.comment'] = '//'
+
+return lex