Class: SQLTree::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/sql_tree/parser.rb

Defined Under Namespace

Classes: UnexpectedToken

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tokens, options) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/sql_tree/parser.rb', line 22

def initialize(tokens, options)
  if tokens.kind_of?(String)
    @tokens = SQLTree::Tokenizer.new.tokenize(tokens)
  else
    @tokens = tokens
  end
  @options = options
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/sql_tree/parser.rb', line 20

def options
  @options
end

Class Method Details

.parse(sql_string, options = {}) ⇒ Object 



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# File 'lib/sql_tree/parser.rb', line 16

def self.parse(sql_string, options = {})
  self.new(sql_string, options).parse!
end

Instance Method Details

#consume(*checks) ⇒ Object 



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# File 'lib/sql_tree/parser.rb', line 39

def consume(*checks)
  checks.each do |check|
    raise UnexpectedToken.new(self.current, check) unless check == self.next
  end
end

#current ⇒ Object 



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# File 'lib/sql_tree/parser.rb', line 31

def current
  @current_token
end

#debug ⇒ Object 



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# File 'lib/sql_tree/parser.rb', line 53

def debug
  puts @tokens.inspect
end

#next ⇒ Object 



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# File 'lib/sql_tree/parser.rb', line 35

def next
  @current_token = @tokens.shift
end

#parse! ⇒ Object 



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# File 'lib/sql_tree/parser.rb', line 57

def parse!
  case self.peek
  when SQLTree::Token::SELECT then SQLTree::Node::SelectQuery.parse(self)
  else raise UnexpectedToken.new(self.peek)
  end
end

#peek(distance = 1) ⇒ Object 



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# File 'lib/sql_tree/parser.rb', line 45

def peek(distance = 1)
  @tokens[distance - 1]
end

#peek_tokens(amount) ⇒ Object 



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# File 'lib/sql_tree/parser.rb', line 49

def peek_tokens(amount)
  @tokens[0, amount]
end