From 57b371900b36ae68de5a0a77617efee9667cabe9 Mon Sep 17 00:00:00 2001
From: Kamil Jarosz <kjarosh256@gmail.com>
Date: Thu, 27 Jun 2024 15:22:20 +0200
Subject: [PATCH] avm2: Implement TextField.getLineLength()

---
 core/src/avm2/globals/flash/text/TextField.as |  5 +---
 .../src/avm2/globals/flash/text/text_field.rs | 24 +++++++++++++++++++
 core/src/display_object/edit_text.rs          |  4 ++++
 3 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/core/src/avm2/globals/flash/text/TextField.as b/core/src/avm2/globals/flash/text/TextField.as
index f871f106b..f5c3e77ec 100644
--- a/core/src/avm2/globals/flash/text/TextField.as
+++ b/core/src/avm2/globals/flash/text/TextField.as
@@ -144,10 +144,7 @@ package flash.text {
             return 0;
         }
 
-        public function getLineLength(lineIndex:int):int {
-            stub_method("flash.text.TextField", "getLineLength");
-            return 0;
-        }
+        public native function getLineLength(lineIndex:int):int;
 
         public native function getLineText(lineIndex:int):String;
 
diff --git a/core/src/avm2/globals/flash/text/text_field.rs b/core/src/avm2/globals/flash/text/text_field.rs
index e141dd4be..710405adf 100644
--- a/core/src/avm2/globals/flash/text/text_field.rs
+++ b/core/src/avm2/globals/flash/text/text_field.rs
@@ -1147,6 +1147,30 @@ pub fn get_line_metrics<'gc>(
     Ok(Value::Undefined)
 }
 
+pub fn get_line_length<'gc>(
+    activation: &mut Activation<'_, 'gc>,
+    this: Object<'gc>,
+    args: &[Value<'gc>],
+) -> Result<Value<'gc>, Error<'gc>> {
+    let Some(this) = this
+        .as_display_object()
+        .and_then(|this| this.as_edit_text())
+    else {
+        return Ok(Value::Undefined);
+    };
+
+    let line_num = args.get_i32(activation, 0)?;
+    if line_num < 0 {
+        return Err(make_error_2006(activation));
+    }
+
+    return if let Some(length) = this.line_length(line_num as usize) {
+        Ok(length.into())
+    } else {
+        Err(make_error_2006(activation))
+    };
+}
+
 pub fn get_line_text<'gc>(
     activation: &mut Activation<'_, 'gc>,
     this: Object<'gc>,
diff --git a/core/src/display_object/edit_text.rs b/core/src/display_object/edit_text.rs
index 55f7e6a2f..892578e44 100644
--- a/core/src/display_object/edit_text.rs
+++ b/core/src/display_object/edit_text.rs
@@ -1913,6 +1913,10 @@ impl<'gc> EditText<'gc> {
         })
     }
 
+    pub fn line_length(self, line: usize) -> Option<usize> {
+        Some(self.0.read().layout.lines().get(line)?.len())
+    }
+
     pub fn line_text(self, line: usize) -> Option<WString> {
         let read = self.0.read();
         let line = read.layout.lines().get(line)?;