From e072f4ab946c1151d7df44853562dbb61773d600 Mon Sep 17 00:00:00 2001
From: Nick Nicholas <opoudjis@gmail.com>
Date: Thu, 9 Nov 2023 00:29:25 +1100
Subject: [PATCH] custom-charset for Private Use character codepoints:
 https://github.com/metanorma/metanorma/issues/339

---
 lib/isodoc/presentation_function/inline.rb | 20 ++++++++++++++++
 lib/isodoc/presentation_xml_convert.rb     |  1 +
 spec/isodoc/presentation_xml_spec.rb       | 28 ++++++++++++++++++++++
 3 files changed, 49 insertions(+)

diff --git a/lib/isodoc/presentation_function/inline.rb b/lib/isodoc/presentation_function/inline.rb
index ef50af0e..81723598 100644
--- a/lib/isodoc/presentation_function/inline.rb
+++ b/lib/isodoc/presentation_function/inline.rb
@@ -99,8 +99,28 @@ def date1(elem)
       elem.replace(@i18n.date(elem["value"], elem["format"].strip))
     end
 
+    def inline_format(docxml)
+      custom_charset(docxml)
+    end
+
+    def custom_charset(docxml)
+      charsets = extract_custom_charsets(docxml)
+      docxml.xpath(ns("//span[@custom-charset]")).each do |s|
+        s["style"] ||= ""
+        s["style"] += ";font-family:#{charsets[s['custom-charset']]}"
+      end
+    end
+
     private
 
+    def extract_custom_charsets(docxml)
+      docxml.xpath(ns("//presentation-metadata/custom-charset-font")).
+        each_with_object({}) do |x, m|
+        kv = x.text.split(":", 2)
+        m[kv[0]] = kv[1]
+      end
+    end
+
     def found_matching_variant_sibling(node)
       prev = node.xpath("./preceding-sibling::xmlns:variant")
       foll = node.xpath("./following-sibling::xmlns:variant")
diff --git a/lib/isodoc/presentation_xml_convert.rb b/lib/isodoc/presentation_xml_convert.rb
index e770b5bd..faf7d2c1 100644
--- a/lib/isodoc/presentation_xml_convert.rb
+++ b/lib/isodoc/presentation_xml_convert.rb
@@ -89,6 +89,7 @@ def inline(docxml)
       variant docxml
       identifier docxml
       date docxml
+      inline_format docxml
     end
 
     def terms(docxml)
diff --git a/spec/isodoc/presentation_xml_spec.rb b/spec/isodoc/presentation_xml_spec.rb
index 36ac54fd..3a2c5759 100644
--- a/spec/isodoc/presentation_xml_spec.rb
+++ b/spec/isodoc/presentation_xml_spec.rb
@@ -1839,6 +1839,34 @@
       .to be_equivalent_to (presxml)
   end
 
+  it "realises custom charsets" do
+    input = <<~INPUT
+      <standard-document xmlns="https://www.metanorma.org/ns/standoc" type="semantic">
+      <presentation-metadata><custom-charset-font>weather:"OGC Weather Symbols"</custom-charset-font></presentation-metadata>
+      <presentation-metadata><custom-charset-font>conscript:"Code 2000"</custom-charset-font></presentation-metadata>
+        <preface>
+          <foreword id="A">
+            <p id="_214f7090-c6d4-8fdc-5e6a-837ebb515871"><span custom-charset="weather">ﶀ</span></p>
+       </foreword></preface></standard-document>
+    INPUT
+    presxml = <<~OUTPUT
+           <standard-document xmlns="https://www.metanorma.org/ns/standoc" type="presentation">
+       <presentation-metadata><custom-charset-font>weather:"OGC Weather Symbols"</custom-charset-font></presentation-metadata>
+       <presentation-metadata><custom-charset-font>conscript:"Code 2000"</custom-charset-font></presentation-metadata>
+         <preface><clause type="toc" id="_" displayorder="1"><title depth="1">Table of contents</title></clause>
+
+           <foreword id="A" displayorder="2">
+             <p id="_"><span custom-charset="weather" style=";font-family:&quot;OGC Weather Symbols&quot;">&#xFD80;</span></p>
+        </foreword></preface></standard-document>
+    OUTPUT
+    expect(strip_guid(IsoDoc::PresentationXMLConvert
+      .new(presxml_options)
+      .convert("test", input, true))
+      .sub(%r{<localized-strings>.*</localized-strings>}m, ""))
+      .to be_equivalent_to (presxml)
+  end
+
+
   private
 
   def mock_symbols