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pkg/**
smql.gemspec

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2011 Denis Knauf

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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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How to Apply These Terms to Your New Programs
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Also add information on how to contact you by electronic and paper mail.
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The hypothetical commands `show w' and `show c' should show the appropriate
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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Idea
====
Similar to MQL: SMQL allowes SQL-queries on your database but in a JSON-based language.
This query language is SQL-injection-safe.
Only expencive queries can slow down your machine.
Usage
=====
Easy query in ruby:
User is a AR-Model and has a column username.
We want to find all users which has the username "auser".
require 'smql'
SmqlToAR.to_ar User, '{"username": "auser"}' # Query in JSON
SmqlToAR.to_ar User, username: "auser" # Query in Ruby
In Rails:
SmqlToAR.to_ar User, params[:smql]
Don't forget to add gem to Gemfile:
gem 'smql'

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require 'rubygems'
require 'rake'
begin
require 'jeweler'
Jeweler::Tasks.new do |gem|
gem.name = "smql"
gem.summary = %Q{JSON-based query language "SMQL" to ActiveRecord converter}
gem.description = %Q{SMQL is a JSON-based query langauage similar to MQL. This gem convertes these querys to ActiveRecord.}
gem.email = %w[Denis.Knauf@gmail.com]
gem.homepage = "http://github.com/DenisKnauf/smql"
gem.authors = ["Denis Knauf"]
gem.files = %w[AUTHORS README.md VERSION LICENSE lib/**/*.rb]
gem.require_paths = %w[lib]
gem.add_dependency 'activerecord'
gem.add_dependency 'activesupport'
gem.add_dependency 'json'
end
Jeweler::GemcutterTasks.new
rescue LoadError
puts "Jeweler (or a dependency) not available. Install it with: sudo gem install jeweler"
end
#require 'rake/testtask'
#Rake::TestTask.new(:test) do |test|
#test.libs << 'lib' << 'test'
#test.pattern = 'test/**/*_test.rb'
#test.verbose = true
#end
#begin
#require 'rcov/rcovtask'
#Rcov::RcovTask.new do |test|
#test.libs << 'test'
#test.pattern = 'test/**/*_test.rb'
#test.verbose = true
#end
#rescue LoadError
#task :rcov do
#abort "RCov is not available. In order to run rcov, you must: sudo gem install spicycode-rcov"
#end
#end
#task :test => :check_dependencies
#task :default => :test
require 'rake/rdoctask'
Rake::RDocTask.new do |rdoc|
if File.exist? 'VERSION'
version = File.read 'VERSION'
else
version = ""
end
rdoc.rdoc_dir = 'rdoc'
rdoc.title = "SMQL #{version}"
rdoc.rdoc_files.include 'README.md'
rdoc.rdoc_files.include 'AUTHORS'
rdoc.rdoc_files.include 'LICENSE'
rdoc.rdoc_files.include 'lib/**/*.rb'
end

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1) gem-plugin

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0.0.0

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require 'active_support/benchmarkable'
require 'active_support/core_ext/array.rb'
require 'active_record'
require 'json'
require 'smql_to_ar'
require 'smql_to_ar/condition_types'
require 'smql_to_ar/query_builder'

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# SmqlToAR - Base library: Converts SMQL to ActiveRecord
# Copyright (C) 2011 Denis Knauf
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
class SmqlToAR
include ActiveSupport::Benchmarkable
############################################################################r
# Exceptions
class SMQLError < Exception
attr_reader :data
def initialize data
@data = data
super data.inspect
end
end
# Ein Fehler ist in einem Subquery aufgetreten.
# Die eigentliche Exception wird in @data[:exception] hinterlegt.
class SubSMQLError < SMQLError
def initialize query, model, exception
ex = {:class => exception.class, :message => exception.message}
ex[:data] = exception.data if exception.respond_to? :data
super :query => query, :model => model.to_s, :exception => ex
set_backtrace exception.backtrace
end
end
class ParseError < SMQLError; end
# Malformed ColOp
class UnexpectedColOpError < ParseError
def initialize model, colop, val
super :got => colop, :val => val, :model => model.to_s
end
end
class UnexpectedError < ParseError
def initialize model, colop, val
super :got => {colop => val}, :model => model.to_s
end
end
class NonExistingSelectableError < SMQLError
def initialize got
super :got => got
end
end
class NonExistingColumnError < SMQLError
def initialize expected, got
super :expected => expected, :got => got
end
end
class NonExistingRelationError < SMQLError
def initialize expected, got
super :expected => expected, :got => got
end
end
class ProtectedColumnError < SMQLError
def initialize protected_column
super :protected_column => protected_column
end
end
class OnlyOrderOnBaseError < SMQLError
def initialize path
super :path => path
end
end
class BuilderError < Exception; end
#############################################################################
# Model der Relation `rel` von `model`
def self.model_of model, rel
model.reflections[ rel.to_sym].andand.klass
end
# Eine Spalte in einer Tabelle, relativ zu `Column#model`.
# Kann auch einen Pfad `Column#path` haben, wobei `Column#col` dann
# eine Relation von dem Model der letzten Relation von `Column#path` ist.
class Column
include Enumerable
attr_reader :path, :col
attr_accessor :model
def initialize model, *col
@model = model
@last_model = nil
*@path, @col = Array.wrap( col).collect {|s| s.to_s.split /[.\/]/ }.flatten.collect &:to_sym
end
def last_model
@last_model ||= each{}
end
def each
model = @model
@path.each do |rel|
model = SmqlToAR.model_of model, rel
return false unless model
yield rel, model
end
model
end
def exist_in?
model = last_model
return false unless model
model.column_names.include? @col.to_s
end
def protected?
model = @model
each do |rel, _model|
pr = Array.wrap model.respond_to?( :smql_protected) ? model.smql_protected : nil
pr.include? rel.to_s
model = _model
end
pr = Array.wrap model.respond_to?( :smql_protected) ? model.smql_protected : nil
pr.include? @col.to_s
end
def joins builder = nil, table = nil, &exe
pp = []
table = Array.wrap table
exe ||= builder ? lambda {|j, m| builder.join table+j, m} : Array.method( :[])
collect do |rel, model|
pp.push rel
exe.call pp, model
end
end
def to_a() @path+[@col] end
def to_s() to_a.join '.' end
def to_sym() to_s.to_sym end
def to_json() to_s end
def inspect() "#<Column: #{model} #{to_s}>" end
def relation() SmqlToAR.model_of last_model, @col end
def allowed?() ! self.protected? end
end
attr_reader :model, :query, :conditions, :builder, :order
attr_accessor :logger
@@logger = if Object.const_defined?( :Rails)
Rails.logger
else
require 'logger'
Logger.new $stdout
end
class <<self
def logger=(logger) @@logger = logger end
def logger() @@logger end
end
def initialize model, query, order = nil
query = JSON.parse query if query.kind_of? String
@model, @query, @logger, @order = model, query, @@logger, order
#p model: @model, query: @query
end
def parse
benchmark 'SMQL parse' do
@conditions = ConditionTypes.try_parse @model, @query
end
#p conditions: @conditions
self
end
def build
benchmark 'SMQL build query' do
@builder = QueryBuilder.new @model
table = @builder.base_table
@conditions.each {|condition| condition.build builder, table }
end
#p builder: @builder
self
end
def ar
@ar ||= benchmark 'SMQL ar' do
@builder.to_ar
end
end
def to_ar
benchmark 'SMQL' do
parse
build
ar.tap {|ar| logger.info ar.to_sql }
end
end
def self.to_ar *params
new( *params).to_ar
end
end

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# SmqlToAR - Parser: Converts SMQL to ActiveRecord
# Copyright (C) 2011 Denis Knauf
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
class SmqlToAR
#############################################################################
# Alle Subklassen (qualitativ: ConditionTypes::*), die als Superklasse Condition haben,
# stellen eine Regel dar, unter diesen sie das gesuchte Objekt annehmen.
# Nimmt eine solche Klasse ein Object nicht an, so wird die naechste Klasse ausprobiert.
# Es wird in der Reihenfolge abgesucht, in der #constants die Klassen liefert,
# wobei angenommen wird, dass diese nach dem Erstellungszeitpunkt sortiert sind,
# aeltere zuerst.
# Nimmt eine Klasse ein Objekt an, so soll diese Klasse instanziert werden.
# Alles weitere siehe Condition.
module ConditionTypes
class <<self
# Ex: 'givenname|surname|nick' => [:givenname, :surname, :nick]
def split_keys k
k.split( '|').collect &:to_sym
end
# Eine Regel parsen.
# Ex: Person, "givenname=", "Peter"
def try_parse_it model, colop, val
r = nil
#p :try_parse => { :model => model, :colop => colop, :value => val }
constants.each do |c|
next if :Condition == c
c = const_get c
next if Condition === c
raise UnexpectedColOpError.new( model, colop, val) unless colop =~ /^(?:\d*:)?(.*?)(\W*)$/
col, op = $1, $2
col = split_keys( col).collect {|c| Column.new model, c }
r = c.try_parse model, col, op, val
break if r
end
raise UnexpectedError.new( model, colop, val) unless r
r
end
# Alle Regeln parsen. Die Regeln sind in einem Hash der Form {colop => val}
# Ex: Person, {"givenname=", "Peter", "surname=", "Mueller"}
def try_parse model, colopvals
colopvals.collect do |colop, val|
#p :try_parse => { colop: colop, val: val, model: model }
try_parse_it model, colop, val
end
rescue SMQLError => e
raise SubSMQLError.new( colopvals, model, e)
end
# Erstellt eine Condition fuer eine Regel.
def simple_condition superclass, op = nil, where = nil, expected = nil
cl = Class.new superclass
cl.const_set :Operator, op if op
cl.const_set :Where, where if where
cl.const_set :Expected, expected if expected
cl
end
end
class Condition
attr_reader :value, :cols
Operator = nil
Expected = []
Where = nil
# Versuche das Objekt zu erkennen. Operator und Expected muessen passen.
# Passt das Object, die Klasse instanzieren.
def self.try_parse model, cols, op, val
#p :self => name, :try_parse => op, :cols => cols, :with => self::Operator, :value => val, :expected => self::Expected, :model => model.name
new model, cols, val if self::Operator === op and self::Expected.any? {|i| i === val }
end
def initialize model, cols, val
@model, @cols = model, cols
@value = case val
when Hash, Range then val
else Array.wrap val
end
verify
end
def verify
@cols.each do |col|
verify_column col
verify_allowed col
end
end
# Gibt es eine Spalte diesen Namens?
# Oder: Gibt es eine Relation diesen Namens? (Hier nicht der Fall)
def verify_column col
raise NonExistingColumnError.new( %w[Column], col) unless col.exist_in?
end
# Modelle koennen Spalten/Relationen verbieten mit Model#smql_protected.
# Dieses muss ein Object mit #include?( name_als_string) zurueckliefern,
# welches true fuer verboten und false fuer, erlaubt steht.
def verify_allowed col
raise ProtectedColumnError.new( col) if col.protected?
end
# Erstelle alle noetigen Klauseln. builder nimmt diese entgegen,
# wobei builder.join, builder.select, builder.where und builder.wobs von interesse sind.
# mehrere Schluessel bedeuten, dass die Values _alle_ zutreffen muessen, wobei die Schluessel geodert werden.
# Ex:
# 1) {"givenname=", "Peter"} #=> givenname = 'Peter'
# 2) {"givenname=", ["Peter", "Hans"]} #=> ( givenname = 'Peter' OR givenname = 'Hans' )
# 3) {"givenname|surname=", ["Peter", "Mueller"]}
# #=> ( givenname = 'Peter' OR surname = 'Peter' ) AND ( givenname = 'Mueller' OR surname = 'Mueller' )
def build builder, table
values = Hash[ @value.collect {|value| [ builder.vid, value ] } ]
values.each {|k, v| builder.wobs k.sym => v }
if 1 == @cols.length
@cols.each do |col|
col.joins builder, table
col = builder.column table+col.path, col.col
builder.where *values.keys.collect {|vid| self.class::Where % [ col, vid.to_s ] }
end
else
values.keys.each do |vid|
builder.where *@cols.collect {|col|
col.joins builder, table
col = builder.column table+col.path, col.col
self.class::Where % [ col, vid.to_s ]
}
end
end
self
end
end
class NotInRange < Condition
Operator = '!..'
Where = "%s NOT BETWEEN %s AND %s"
Expected = [Range, lambda {|val| Array === val && 2 == val.length } ]
def initialze model, cols, val
if Array === val && 2 == val.length
f, l = val
f, l = Time.parse(f), Time.parse(l) if f.kind_of? String
val = f..l
end
super model, cols, val
end
def build builder, table
builder.wobs (v1 = builder.vid) => @value.begin, (v2 = builder.vid) => @value.end
@cols.each do |col|
col.joins builder, table
builder.where self.class::Where % [ builder.column( table+col.path, col.col), v1, v2]
end
self
end
end
InRange = simple_condition NotInRange, '..', "%s BETWEEN %s AND %s"
class NotIn < Condition
Operator = '!|='
Where = "%s NOT IN (%s)"
Expected = [Array]
def build builder, table
builder.wobs (v = builder.vid).to_sym => @value
@cols.each do |col|
col.joins builder, table
builder.where self.class::Where % [ builder.column( table, col), v.to_s]
end
self
end
end
In = simple_condition NotIn, '|=', '%s IN (%s)', [Array]
In2 = simple_condition In, '', nil, [Array]
NotEqual = simple_condition Condition, /\!=|<>/, "%s <> %s", [Array, String, Numeric]
GreaterThanOrEqual = simple_condition Condition, '>=', "%s >= %s", [Array, Numeric]
LesserThanOrEqual = simple_condition Condition, '<=', "%s <= %s", [Array, Numeric]
class EqualJoin <Condition
Operator = '='
Expected = [Hash]
def initialize *pars
super( *pars)
cols = {}
@cols.each do |col|
col_model = SmqlToAR.model_of col.last_model, col.col
#p col_model: col_model.to_s, value: @value
cols[col] = [col_model] + ConditionTypes.try_parse( col_model, @value)
end
@cols = cols
end
def verify_column col
refl = SmqlToAR.model_of col.last_model, col.col
#p refl: refl, model: @model.name, col: col, :reflections => @model.reflections.keys
raise NonExistingRelationError.new( %w[Relation], col) unless refl
end
def build builder, table
@cols.each do |col, sub|
t = table + col.path + [col.col]
#p sub: sub
p col: col, joins: col.joins
col.joins.each {|j, m| builder.join table+j, m }
builder.join t, SmqlToAR.model_of( col.last_model, col.col)
sub[1..-1].each {|one| one.build builder, t }
end
self
end
end
Equal = simple_condition Condition, '=', "%s = %s", [Array, String, Numeric]
Equal2 = simple_condition Equal, '', "%s = %s", [String, Numeric]
GreaterThan = simple_condition Condition, '>', "%s > %s", [Array, Numeric]
LesserThan = simple_condition Condition, '<', "%s < %s", [Array, Numeric]
NotIlike = simple_condition Condition, '!~', "%s NOT ILIKE %s", [Array, String]
Ilike = simple_condition Condition, '~', "%s ILIKE %s", [Array, String]
####### No Operator #######
Join = simple_condition EqualJoin, '', nil, [Hash]
InRange2 = simple_condition InRange, '', nil, [Range]
class Select < Condition
Operator = ''
Expected = [nil]
def verify_column col
raise NonExistingSelectableError.new( col) unless col.exist_in? or SmqlToAR.model_of( col.last_model, col.col)
end
def build builder, table
@cols.each do |col|
if col.exist_in?
col.joins builder, table
builder.select table+col.to_a
else
col.joins {|j, m| builder.includes table+j }
builder.includes table+col.to_a
end
end
self
end
end
class Functions < Condition
Operator = ':'
Expected = [String, Array, Hash, Numeric, nil]
class Function
Name = nil
Expected = []
attr_reader :model, :func, :args
def self.try_parse model, func, args
SmqlToAR.logger.info( { try_parse: [func,args]}.inspect)
self.new model, func, args if self::Name === func and self::Expected.any? {|e| e === args }
end
def initialize model, func, args
@model, @func, @args = model, func, args
end
end
class Order < Function
Name = :order
Expected = [String, Array, Hash, nil]
def initialize model, func, args
SmqlToAR.logger.info( {args: args}.inspect)
args = case args
when String then [args]
when Array, Hash then args.to_a
when nil then nil
else raise 'Oops'
end
SmqlToAR.logger.info( {args: args}.inspect)
args.andand.collect! do |o|
o = Array.wrap o
col = Column.new model, o.first
o = 'desc' == o.last.to_s.downcase ? :DESC : :ASC
raise NonExistingColumnError.new( [:Column], col) unless col.exist_in?
[col, o]
end
SmqlToAR.logger.info( {args: args}.inspect)
super model, func, args
end
def build builder, table
return if @args.blank?
@args.each do |o|
col, o = o
col.joins builder, table
t = table + col.path
raise OnlyOrderOnBaseError.new( t) unless 1 == t.length
builder.order t, col.col, o
end
end
end
def self.new model, col, val
SmqlToAR.logger.info( { function: col.first.to_sym }.inspect)
r = nil
constants.each do |c|
next if [:Function, :Where, :Expected, :Operator].include? c
c = const_get c
next if Function === c or not c.respond_to?( :try_parse)
SmqlToAR.logger.info( {f: c}.inspect)
r = c.try_parse model, col.first.to_sym, val
SmqlToAR.logger.info( {r: r}.inspect)
break if r
end
r
end
end
end
end

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# SmqlToAR - Builds AR-querys: Converts SMQL to ActiveRecord
# Copyright (C) 2011 Denis Knauf
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
class SmqlToAR
#######################################################################################
# Baut die Queries zusammen.
class QueryBuilder
# Erzeugt einen eindeutigen Identikator "cX", wobei X iteriert wird.
class Vid
attr_reader :vid
def initialize( vid) @vid = vid end
def to_s() ":c#{@vid}" end
def to_sym() "c#{@vid}".to_sym end
alias sym to_sym
def to_i() @vid end
end
attr_reader :table_alias, :model, :table_model, :base_table, :_where, :_select, :_wobs, :_joins
attr_accessor :logger
@@logger = SmqlToAR.logger
def initialize model
@logger = @@logger
@table_alias = Hash.new do |h, k|
k = Array.wrap k
h[k] = "smql,#{k.join(',')}"
end
@_vid, @_where, @_wobs, @model, @quoter = 0, [], {}, model, model.connection
@base_table = [model.table_name.to_sym]
@table_alias[ @base_table] = @base_table.first
t = quote_table_name @table_alias[ @base_table]
@_select, @_joins, @_joined, @_includes, @_order = ["DISTINCT #{t}.*"], "", [], [], []
@table_model = {@base_table => @model}
end
def vid() Vid.new( @_vid+=1) end
# Jede via where uebergebene Condition wird geodert und alle zusammen werden geundet.
# "Konjunktive Normalform". Allerdings duerfen Conditions auch Komplexe Abfragen enthalten.
# Ex: builder.where( 'a = a', 'b = c').where( 'c = d', 'e = e').where( 'x = y').where( '( m = n AND o = p )', 'f = g')
# #=> WHERE ( a = a OR b = c ) AND ( c = d OR e = e ) AND x = y ( ( m = n AND o = p ) OR f = g )
def where *cond
@_where.push cond
self
end
def wobs vals
@_wobs.update vals
self
end
def quote_column_name name
@quoter.quote_column_name( name).gsub /"\."/, ','
end
def quote_table_name name
@quoter.quote_table_name( name).gsub /"\."/, ','
end
def column table, name
"#{quote_table_name table.kind_of?(String) ? table : @table_alias[table]}.#{quote_column_name name}"
end
def build_join orig, pretable, table, prekey, key
" JOIN #{quote_table_name orig.to_sym} AS #{quote_table_name table} ON #{column pretable, prekey} = #{column table, key} "
end
def join table, model
return self if @_joined.include? table # Already joined
pretable = table[0...-1]
@table_model[ table] = model
premodel = @table_model[ pretable]
t = @table_alias[ table]
pt = quote_table_name @table_alias[ table[ 0...-1]]
refl = premodel.reflections[table.last]
case refl.macro
when :has_many
@_joins += build_join model.table_name, pretable, t, premodel.primary_key, refl.primary_key_name
when :belongs_to
@_joins += build_join model.table_name, pretable, t, refl.primary_key_name, premodel.primary_key
when :has_and_belongs_to_many
jointable = [','] + table
@_joins += build_join refl.options[:join_table], pretable, @table_alias[jointable], premodel.primary_key, refl.primary_key_name
@_joins += build_join model.table_name, jointable, t, refl.association_foreign_key, refl.association_primary_key
else raise BuilderError, "Unkown reflection macro: #{refl.macro.inspect}"
end
@_joined.push table
self
end
def includes table
@_includes.push table
self
end
def select col
@_select.push quote_column_name( @table_alias[col])
self
end
def order table, col, o
@_order.push "#{column table, col} #{:DESC == o ? :DESC : :ASC}"
end
class Dummy
def method_missing m, *a, &e
#p :dummy => m, :pars => a, :block => e
self
end
end
def build_ar
where_str = @_where.collect do |w|
w = Array.wrap w
1 == w.length ? w.first : "( #{w.join( ' OR ')} )"
end.join ' AND '
incls = {}
@_includes.each do |inc|
b = incls
inc[1..-1].collect {|rel| b = b[rel] ||= {} }
end
@logger.debug incls: incls, joins: @_joins
@model = @model.
select( @_select.join( ', ')).
joins( @_joins).
where( where_str, @_wobs).
order( @_order.join( ', ')).
includes( incls)
end
def fix_calculate
def @model.calculate operation, column_name, options = nil
options = options.try(:dup) || {}
options[:distinct] = true unless options.except(:distinct).present?
column_name = klass.primary_key unless column_name.present?
super operation, column_name, options
end
self
end
def to_ar
build_ar
fix_calculate
@model
end
end
end