Class: Seaquel::AST::Expression

Inherits:
Object
  • Object
show all
Defined in:
lib/seaquel/ast/expression.rb

Overview

Base class for all expression-type AST nodes.

Direct Known Subclasses

BinOp, Binding, Column, Funcall, JoinOp, Literal, Table, Unary

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.binop(op, *aliases) ⇒ Object 



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# File 'lib/seaquel/ast/expression.rb', line 6

def self.binop op, *aliases
  define_method(op) do |exp|
    BinOp.new(op, self, exp)
  end

  aliases.each do |op_alias|
    alias_method(op_alias, op)
  end
end

.joinop(op, *aliases) ⇒ Object 



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# File 'lib/seaquel/ast/expression.rb', line 15

def self.joinop op, *aliases
  define_method(op) do |exp|
    JoinOp.new(op, [self, exp])
  end

  aliases.each do |op_alias|
    alias_method(op_alias, op)
  end
end

.unaryop(op, *aliases) ⇒ Object 



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# File 'lib/seaquel/ast/expression.rb', line 24

def self.unaryop op, *aliases
  define_method(op) do
    Unary.new(op, self)
  end

  aliases.each do |op_alias|
    alias_method(op_alias, op)
  end
end

Instance Method Details

#as(name) ⇒ Object 



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# File 'lib/seaquel/ast/expression.rb', line 79

def as name
  Alias.new(name, self)
end

#asc ⇒ Object 



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# File 'lib/seaquel/ast/expression.rb', line 83

def asc
  Order.new(:asc, self)
end

#desc ⇒ Object 



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# File 'lib/seaquel/ast/expression.rb', line 86

def desc
  Order.new(:desc, self)
end

#lisp_inspect(type, *args) ⇒ Object 



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# File 'lib/seaquel/ast/expression.rb', line 90

def lisp_inspect type, *args
  "(" + 
    [type.to_s, args.map(&:inspect)].join(' ') + ")"
end