parse lcov file in ruby

lib/coverage_report.rb

@@ -20,25 +20,12 @@ class CoverageReport
     end
 
     def lcov(report_path, data)
-      lcov_result = execute_lcov_parse(report_path)
-      minumum_percent = data[:min]
-      { 'lines' => { 'covered_percent' => lcov_covered_percent(lcov_result), 'minumum_percent' => minumum_percent } }
+      lcov = LcovParse.new(File.read(report_path))
+      { 'lines' => { 'covered_percent' => lcov.covered_percent, 'minumum_percent' => data[:min] } }
     end
 
     private
 
-    def lcov_covered_percent(lcov_result)
-      lines = lcov_result.map { |r| r['lines']['details'] }.flatten
-      total_lines = lines.count.to_f.round(2)
-      covered_lines = lines.select { |r| r['hit'] >= 1 }.count.to_f
-      ((covered_lines / total_lines) * 100).round(2)
-    end
-
-    def execute_lcov_parse(report_path)
-      bin_path = "#{File.dirname(__FILE__)}/../bin"
-      JSON.parse(`node #{bin_path}/lcov-parse.js #{report_path}`)
-    end
-
     def read_json(path)
       JSON.parse(File.read(path))
     end

lib/index.rb

@@ -7,6 +7,7 @@ require_relative './report_adapter'
 require_relative './github_check_run_service'
 require_relative './github_client'
 require_relative './coverage_report'
+require_relative './lcov_parse'
 
 def read_json(path)
   JSON.parse(File.read(path))

lib/lcov_parse.rb

@@ -0,0 +1,40 @@
+class LcovParse
+  def initialize(lcov_content)
+    @lcov = lcov_content
+  end
+
+  def to_json
+    @to_json ||= @lcov.split("end_of_record").map do |file_item|
+      file_item.split("\n").reduce({}) do |memo, item|
+        type, value = item.split(":")
+        case type
+        when "DA", "FNF", "FNH", "LF", "LH", "FN", "FNDA", "BRDA", "BRF", "BRH"
+          memo[type] = [] unless memo[type]
+          memo[type].push(value&.strip)
+        when "TN", "SF"
+          memo[type] = value
+        end
+        memo
+      end
+    end
+  end
+
+  def lines
+    @lines ||=
+      to_json.map{|it| it["DA"] }
+        .flatten.compact
+        .map{|it| it.split(",").last }
+  end
+
+  def total_lines
+    lines.count
+  end
+
+  def covered_lines
+    lines.select{|it| it == "1" }.count
+  end
+
+  def covered_percent
+    ((covered_lines / total_lines.to_f) * 100).round(2)
+  end
+end

spec/spec_helper.rb

@@ -7,3 +7,4 @@ require './lib/report_adapter'
 require './lib/github_check_run_service'
 require './lib/github_client'
 require './lib/coverage_report'
+require './lib/lcov_parse'