resolves #2358 support horizontal alignment on AsciiDoc table cell that only contains paragraphs (PR #2359)

3 files changed, 55 insertions, 0 deletions

diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 8b118aa1..6b403054 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -26,6 +26,7 @@ Enhancements::
 * upgrade to prawn-icon 3.1.x to add support for the Material Design Icons (`mdi`) as an available font-based icon set (PR #2334)
 * honor `GS_OPTIONS` environment variable for supplying additional parameters to command called by RGhost optimizer (#2337)
 * add support for passing a color mode to the default optimizer (#2347)
+* support horizontal alignment on AsciiDoc table cell that only contains paragraphs (#2358)
 
 Improvements::
 
diff --git a/lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb b/lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb
index 106bc29e..0a47b6c3 100644
--- a/lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb
+++ b/lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb
@@ -115,11 +115,16 @@ module Prawn
             font_size = font_info[:size]
           end
           font_style ||= font_info[:style]
+          if (@align == :center || @align == :right) && content.blocks.map(&:context).uniq == [:paragraph]
+            prev_text_align = pdf.instance_variable_get :@base_text_align
+            pdf.instance_variable_set :@base_text_align, @align
+          end
           pdf.font font_family, size: font_size, style: font_style do
             yield
           ensure
             pdf.font_color = prev_font_color if prev_font_color
             pdf.font_scale = prev_font_scale if prev_font_scale
+            pdf.instance_variable_set :@base_text_align, prev_text_align if prev_text_align
           end
         end
       end
diff --git a/spec/table_spec.rb b/spec/table_spec.rb
index fb7dba36..09bd0e4a 100644
--- a/spec/table_spec.rb
+++ b/spec/table_spec.rb
@@ -1877,6 +1877,55 @@ describe 'Asciidoctor::PDF::Converter - Table' do
       (expect pdf.lines).to eql ['10. ten', '11. eleven', '12. twelve', 'buckle', 'my', 'shoe']
     end
 
+    it 'should honor horizontal alignment on AsciiDoc table cell' do
+      pdf = to_pdf <<~'EOS', analyze: true
+      [cols=1a]
+      |===
+      |left
+      |===
+
+      [cols=^1a]
+      |===
+      |center
+      |===
+
+      [cols=>1a]
+      |===
+      |right
+      |===
+      EOS
+
+      page_width = pdf.pages[0][:size][0]
+      midpoint = page_width * 0.5
+      left_text = pdf.find_unique_text 'left'
+      center_text = pdf.find_unique_text 'center'
+      right_text = pdf.find_unique_text 'right'
+      (expect left_text[:x]).to be < midpoint
+      (expect center_text[:x]).to be < midpoint
+      (expect center_text[:x] + center_text[:width]).to be > midpoint
+      (expect right_text[:x]).to be > midpoint
+    end
+
+    it 'should not honor horizontal alignment on AsciiDoc table cell that contains non-paragraph blocks' do
+      pdf = to_pdf <<~'EOS', analyze: true
+      [cols=>1a]
+      |===
+      |
+      left
+
+      '''
+
+      left
+      |===
+      EOS
+
+      page_width = pdf.pages[0][:size][0]
+      midpoint = page_width * 0.5
+      left_texts = pdf.find_text 'left'
+      (expect left_texts[0][:x]).to be < midpoint
+      (expect left_texts[1][:x]).to be < midpoint
+    end
+
     it 'should convert nested table' do
       pdf = to_pdf <<~'EOS', analyze: true
       [cols="1,2a"]