From 7934124221d1a436347fb98d60df59fc7b7f7335 Mon Sep 17 00:00:00 2001
From: ekkxl <fake@email.com>
Date: Mon, 23 Jan 2023 16:03:54 -0500
Subject: [PATCH] Add line_widths to Prawn::Text::Formatted::Box

---
 lib/prawn/text/formatted/box.rb       |  4 +++
 lib/prawn/text/formatted/wrap.rb      |  2 ++
 spec/prawn/text/formatted/box_spec.rb | 48 +++++++++++++++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/lib/prawn/text/formatted/box.rb b/lib/prawn/text/formatted/box.rb
index 16b6b3a4f..1ee41fc87 100644
--- a/lib/prawn/text/formatted/box.rb
+++ b/lib/prawn/text/formatted/box.rb
@@ -130,6 +130,8 @@ def everything_printed?
         attr_reader :descender
         # The leading used during printing
         attr_reader :leading
+        # The width of each line
+        attr_reader :line_widths
 
         def line_gap
           line_height - (ascender + descender)
@@ -194,6 +196,8 @@ def initialize(formatted_text, options = {})
             style: options[:style]
           }
 
+          @line_widths = []
+
           super(formatted_text, options)
         end
 
diff --git a/lib/prawn/text/formatted/wrap.rb b/lib/prawn/text/formatted/wrap.rb
index 81b4fdac5..cf342f809 100644
--- a/lib/prawn/text/formatted/wrap.rb
+++ b/lib/prawn/text/formatted/wrap.rb
@@ -106,6 +106,8 @@ def print_line
             accumulated_width += fragment_this_line.width
           end
 
+          @line_widths.push(accumulated_width)
+
           @printed_lines << printed_fragments.map do |s|
             s.dup.force_encoding(::Encoding::UTF_8)
           end.join
diff --git a/spec/prawn/text/formatted/box_spec.rb b/spec/prawn/text/formatted/box_spec.rb
index 327a788d0..7f32b39c4 100644
--- a/spec/prawn/text/formatted/box_spec.rb
+++ b/spec/prawn/text/formatted/box_spec.rb
@@ -906,4 +906,52 @@ def render_in_front(fragment); end
       )
     end
   end
+
+  describe 'Text::Formatted::box#line_widths' do
+    it 'handles newlines' do
+      accented_char = win1252_string("\xE9"); # é in win-1252
+      array = [
+        {
+          text: "Oh hai t#{accented_char}xt rect.\nOh hai text rect thats longer.",
+          font: 'Times-Roman',
+          size: 12
+        }
+      ]
+
+      options = { document: pdf }
+      text_box = described_class.new(array, options)
+      text_box.render
+      expect(text_box.line_widths).to eq(
+        [
+          77.136,
+          135.804
+        ]
+      )
+    end
+
+    it 'handles fallback fonts' do
+      file = "#{Prawn::DATADIR}/fonts/gkai00mp.ttf"
+      pdf.font_families['Kai'] = {
+        normal: { file: file, font: 'Kai' }
+      }
+      array = [
+        {
+          text: "hello你好\n再见goodbye",
+          font: 'Times-Roman',
+          size: 12
+        }
+      ]
+
+      options = { document: pdf, fallback_fonts: ['Kai'] }
+      text_box = described_class.new(array, options)
+      text_box.render
+
+      expect(text_box.line_widths).to eq(
+        [
+          48.000,
+          65.328
+        ]
+      )
+    end
+  end
 end