1 files changed, 31 insertions, 0 deletions
diff --git a/lua/plugins/textobject-lexer.lua b/lua/plugins/textobject-lexer.lua
new file mode 100644
index 0000000..2f9d757
--- /dev/null
+++ b/lua/plugins/textobject-lexer.lua
@@ -0,0 +1,31 @@
+-- text object matching a lexer token
+
+local MAX_CONTEXT = 32768
+
+vis:textobject_new("ii", function(win, pos)
+
+	if not win.syntax or not vis.lexers.load then
+		return nil
+	end
+
+	local before, after = pos - MAX_CONTEXT, pos + MAX_CONTEXT
+	if before < 0 then
+		before = 0
+	end
+	-- TODO make sure we start at a line boundary?
+
+	local lexer = vis.lexers.load(win.syntax, nil, true)
+	local data = win.file:content(before, after - before)
+	local tokens = lexer:lex(data)
+	local cur = before
+
+	for i = 1, #tokens, 2 do
+		local token_next = before + tokens[i+1] - 1
+		if cur <= pos and pos < token_next then
+			return cur, token_next
+		end
+		cur = token_next
+	end
+
+	return nil
+end, "Current lexer token")