From 4e61a50946d638915b204513c8ef4d0538c73eed Mon Sep 17 00:00:00 2001
From: Pierre Tachoire <pierre@lightpanda.io>
Date: Mon, 25 Mar 2024 17:45:19 +0100
Subject: [PATCH] css: add isEmptyText in node interface

---
 src/css/libdom.zig     | 8 ++++++++
 src/css/match_test.zig | 4 ++++
 src/css/selector.zig   | 6 ++++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/css/libdom.zig b/src/css/libdom.zig
index 93acb790..4166b216 100644
--- a/src/css/libdom.zig
+++ b/src/css/libdom.zig
@@ -61,6 +61,14 @@ pub const Node = struct {
         return t == .text;
     }
 
+    pub fn isEmptyText(n: Node) !bool {
+        const data = try parser.nodeTextContent(n.node);
+        if (data == null) return true;
+        if (data.?.len == 0) return true;
+
+        return std.mem.trim(u8, data.?, &std.ascii.whitespace).len == 0;
+    }
+
     pub fn tag(n: Node) ![]const u8 {
         return try parser.nodeName(n.node);
     }
diff --git a/src/css/match_test.zig b/src/css/match_test.zig
index 796ee7d7..f30f2e5b 100644
--- a/src/css/match_test.zig
+++ b/src/css/match_test.zig
@@ -48,6 +48,10 @@ pub const Node = struct {
         return false;
     }
 
+    pub fn isEmptyText(_: *const Node) !bool {
+        return false;
+    }
+
     pub fn tag(n: *const Node) ![]const u8 {
         return n.name;
     }
diff --git a/src/css/selector.zig b/src/css/selector.zig
index e678fb1d..fbe782d3 100644
--- a/src/css/selector.zig
+++ b/src/css/selector.zig
@@ -383,8 +383,10 @@ pub const Selector = union(enum) {
                         while (c != null) {
                             if (c.?.isElement()) return false;
 
-                            // TODO check text node content equals an empty
-                            // string ("")
+                            if (c.?.isText()) {
+                                if (try c.?.isEmptyText()) continue;
+                                return false;
+                            }
 
                             c = try c.?.nextSibling();
                         }