Solutions 1-3, by Henry and Sage

csv_parser.rb

@@ -0,0 +1,50 @@
+require 'pp'
+
+def csv_parser(file_data, delimiter: ',')
+  output = []
+  lines = file_data.split("\n")
+  lines.each do |line|
+    row_output = []
+    values = line.split(delimiter, -1)
+    escaped = false
+    current_value = ''
+    values.each do |value|
+      current_value += value
+      escaped = !escaped if value =~ /"/
+      if escaped
+        current_value += delimiter
+      else
+        current_value.tr!('"', '')
+        current_value = nil if current_value == ''
+        row_output << current_value
+        current_value = ''
+      end
+    end
+    output << row_output
+  end
+  output
+end
+
+require 'minitest/autorun'
+require 'csv'
+
+# Tests
+class CSVParserTest < Minitest::Test
+  def test_cat_breeds
+    csv_data = File.read('cat_breeds.csv')
+    assert_equal csv_parser(csv_data, delimiter: ','),
+                 CSV.parse(csv_data)
+  end
+
+  def test_dogs
+    csv_data = File.read('dogs.csv')
+    assert_equal csv_parser(csv_data, delimiter: ','),
+                 CSV.parse(csv_data)
+  end
+
+  def test_dinosaurs
+    csv_data = File.read('dinosaurs.csv')
+    assert_equal csv_parser(csv_data, delimiter: "\t"),
+                 CSV.parse(csv_data, col_sep: "\t")
+  end
+end