[specification] PDF update

specification/Makefile

@@ -14,12 +14,16 @@ OPTIONS := --trace \
 REQUIRES := --require=asciidoctor-bibtex \
             --require=asciidoctor-diagram \
             --require=asciidoctor-mathematical
+REQUIRES := --require=asciidoctor-bibtex \
+            --require=asciidoctor-diagram \
+            --require=asciidoctor-mathematical \
+            --require=./preprocessor.rb
 
 .PHONY: all build clean build-container build-no-container
 
 all: build
 
-build: 
+build:
 	@echo "Checking if Docker is available..."
 	@if command -v docker >/dev/null 2>&1 ; then \
 		echo "Docker is available, building inside Docker container..."; \

specification/preprocessor.rb

@@ -0,0 +1,20 @@
+require 'asciidoctor'
+require 'asciidoctor/extensions'
+
+require 'asciidoctor/extensions'
+
+Asciidoctor::Extensions.register do
+  preprocessor do
+    process do |document, reader|
+      new_lines = []
+      reader.readlines.each do |line|
+        if line.strip == "[source,mermaid]"
+          new_lines << "[mermaid]"
+        else
+          new_lines << line
+        end
+      end
+      Asciidoctor::Reader.new(new_lines)
+    end
+  end
+end