setup files for parser part

.gitignore

@@ -1,3 +1,4 @@
 .idea
 
-lexer.rb
+lexer.rb
+parser.rb

README.md

@@ -1,15 +1,19 @@
 # parser
 
-###Prerequisites
+### Prerequisites
 
 * Rexical (rex) 
+* Racc
 
-###Available commands
+### Available commands
 
 * `rake lexer` - generates `lexer.rb` file based on `specification.rex` file
+* `rake parser` - generates `parser.rb` file based on `grammar.y` file
+* `rake generate` - generates `lexer.rb` and `parser.rb` files
 
-###Testing
+### Testing
 
 To run only `lexer` tests, execute : `rspec spec/query_lexer_spec.rb`
+To run only `parser` tests, execute : `rspec spec/query_parser_spec.rb`
 
 To run all tests, execute : `rake spec`

Rakefile

@@ -2,11 +2,19 @@ require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new do |c|
   options = ['--color']
-  options += ["--format", "documentation"]
+  options += %w[--format documentation]
   c.rspec_opts = options
 end
 
-desc "Generate Lexer"
+desc 'Generate Lexer'
 task :lexer do
   `rex specification.rex -o lexer.rb`
-end
+end
+
+desc 'Generate Parser'
+task :parser do
+  `racc grammar.y -o parser.rb`
+end
+
+desc 'Generate Lexer and Parser'
+task generate: %i[lexer parser]

grammar.y

@@ -0,0 +1,9 @@
+class Query
+    rule
+        expression:
+end
+
+---- inner
+  def parse(input)
+    scan_str(input)
+  end

spec/query_parser_spec.rb

@@ -0,0 +1,9 @@
+require './parser'
+
+class QueryParserTester
+  describe 'Testing the Parser' do
+    before do
+      @evaluator = Query.new
+    end
+  end
+end