init

.gitignore

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+*.gem
+.bundle
+Gemfile.lock
+pkg/*

Gemfile

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+source "http://rubygems.org"
+
+# Specify your gem's dependencies in sql_parser.gemspec
+gemspec

Rakefile

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+require "bundler/gem_tasks"

lib/..rb

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+require "./version"
+
+module .
+  # Your code goes here...
+end

lib/sql_parser.rb

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+require "rubygems"
+require "treetop"
+
+dir = File.expand_path(File.dirname(__FILE__))
+Treetop.load File.expand_path("#{dir}/sql_parser/sql_parser")
+
+class SqlParser::ItemsNode < Treetop::Runtime::SyntaxNode
+  def values
+    items.values.unshift(item.value)
+  end
+end
+
+class SqlParser::ItemNode < Treetop::Runtime::SyntaxNode
+  def values
+    [value]
+  end
+
+  def value
+    text_value.to_sym
+  end
+end

lib/sql_parser/sql_parser.treetop

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+grammar Sql
+  rule statement
+    select from where {
+      def tree
+        {
+          :operator => operator,
+          :set_quantifier => set_quantifier,
+          :fields => fields,
+          :tables => tables,
+          :conditions => conditions
+        }
+      end
+
+      def operator
+        :select
+      end
+
+      def set_quantifier
+        select.set_quantifier
+      end
+
+      def fields
+        select.fields
+      end
+
+      def tables
+        from.tables
+      end
+
+      def conditions
+        where.conditions
+      end
+    }
+  end
+
+  rule select
+    "select" quantifier:set_quantifier items {
+      def fields
+        items.values
+      end
+
+      def set_quantifier
+        quantifier.value
+      end
+    }
+  end
+
+  rule set_quantifier
+    (
+      required_space 'distinct' required_space
+      /
+      required_space 'all' required_space
+    ) {
+      def value
+        text_value.strip.downcase.to_sym
+      end
+    }
+    /
+    required_space {
+      def value
+        nil
+      end
+    }
+  end
+
+  rule from
+    required_space "from" required_space items {
+      def tables
+        items.values
+      end
+    }
+    /
+    space {
+      def tables
+        []
+      end
+    }
+  end
+
+  rule where
+    required_space "where" required_space conditional_items {
+      def conditions
+        conditional_items.node
+      end
+    }
+    /
+    space {
+      def conditions
+        []
+      end
+    }
+  end
+
+  rule conditional_items
+    conditional_item required_space boolean_join required_space conditional_items {
+      def node
+        all_nodes = []
+        all_nodes.concat(conditional_item.node)
+        all_nodes << {:operator => boolean_join.operator}
+        all_nodes.concat(conditional_items.node)
+        all_nodes
+      end
+    }
+    /
+    conditional_item
+  end
+
+  rule boolean_join
+    ('and' / 'or') {
+      def operator
+        text_value.to_sym
+      end
+    }
+  end
+
+  rule conditional_item
+    assignment_field space conditional_operator space assignment_value {
+      def node
+        [{
+          :operator => conditional_operator.value,
+          :field => assignment_field.text_value.to_sym,
+          :value => assignment_value.value
+        }]
+      end
+    }
+  end
+
+  rule conditional_operator
+    ('<>' / '>=' / '<=' / '=' / '>' / '<') {
+      def value
+        text_value.to_sym
+      end
+    }
+  end
+
+  rule assignment_field
+    !keyword [a-zA-Z_] [a-zA-Z0-9_]*
+  end
+
+  rule assignment_value
+    string_assignment_value
+    /
+    numeric_assignment_value
+  end
+
+  rule string_assignment_value
+    "'" [^']* "'" {
+      def value
+        text_value[1..-2]
+      end
+    }
+  end
+
+  rule numeric_assignment_value
+    !keyword [0-9]+ {
+      def value
+        Integer(text_value)
+      end
+    }
+  end
+
+  rule items
+    item space [,]+ space items <SqlParser::ItemsNode>
+    /
+    item
+  end
+
+  rule item
+    !keyword [a-z_0-9*]+ <SqlParser::ItemNode>
+  end
+
+  rule keyword
+    'select' / 'from'
+  end
+
+  rule required_space
+    ' '+
+  end
+
+  rule space
+    ' '*
+  end
+end

lib/sql_parser/version.rb

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+class SqlParser
+  VERSION = "0.0.1"
+end

spec/spec_helper.rb

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+dir = File.dirname(__FILE__)
+$LOAD_PATH.unshift("#{dir}/../lib")
+require "sql_parser"
+
+# require "spec"