vertices and edges related

graph.rb

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+require 'json'
+
+@graph = []
+@node_id = [0]
+@edge_id = [0]
+
+def process input
+    words = input.split(' ')
+    return create_node words[1] if words[0] == 'node'
+    return create_edge words[1], words[2].to_i, words[3].to_i if words[0] == 'edge'      
+end
+
+def create_node name
+    @node_id << @node_id.last+1
+    node = {
+        id: @node_id.last,
+        name: name,
+        edge: []
+    }
+    @graph.push(node)
+    puts "Node '#{name}' is created"
+end
+
+def create_edge label, ins, out
+    @edge_id << @edge_id.last+1
+    edge = {
+        id: @edge_id.last,
+        name: label,
+        ins: [].push(ins),
+        out: [].push(out)
+    }
+    mix_node_and edge
+    puts "Edge '#{label}' is created"
+end
+
+def mix_node_and edge
+    @graph.each do |vertex|
+        if vertex[:id] == edge[:ins].last or vertex[:id] == edge[:out].last
+            vertex[:edge] << edge
+        end
+    end      
+end
+
+def graph_to_json
+    File.open('result.json', 'w') do |file|
+        @graph.each do |line|  
+            file.puts "#{line.to_json}\n"
+        end      
+    end
+    puts 'data replaced in "result.json" inside root folder' 
+end
+
+while true
+    print "Graph>>> "
+    input = gets.chomp
+    if input.downcase == "check graph"
+        puts @graph.inspect
+    elsif input.downcase == "graph to json"
+        graph_to_json
+    else
+        process(input)
+    end
+end

result.json

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+{"id":1,"name":"Adarsh","edge":[{"id":1,"name":"friends","ins":[1],"out":[2]}]}
+{"id":2,"name":"Pankaj","edge":[{"id":1,"name":"friends","ins":[1],"out":[2]}]}