Module: Alf::Sql::Expr

Included in:
ColumnName, CrossJoin, FromClause, InnerJoin, LimitClause, Literal, NameIntro, OffsetClause, OrderByClause, OrderByTerm, QualifiedName, RangeVarName, SelectExp, SelectItem, SelectList, SelectStar, SetOperator, SetQuantifier, SubqueryAs, TableAs, TableName, WhereClause, WithExp, WithSpec
Defined in:
lib/alf/sql/nodes/expr.rb

Constant Summary collapse

LEFT_PARENTHESE = 
"(".freeze
RIGHT_PARENTHESE = 
")".freeze
SPACE = 
" ".freeze
COMMA = 
",".freeze
DOT = 
".".freeze
QUOTE = 
"'".freeze
AS = 
"AS".freeze
AND = 
"AND".freeze
OR = 
"OR".freeze
NOT = 
"NOT".freeze
TRUE = 
"TRUE".freeze
FALSE = 
"FALSE".freeze
EQUAL = 
"=".freeze
NOT_EQUAL = 
"<>".freeze
GREATER = 
">".freeze
LESS = 
"<".freeze
GREATER_OR_EQUAL = 
">=".freeze
LESS_OR_EQUAL = 
"<=".freeze
IN = 
"IN".freeze
EXISTS = 
"EXISTS".freeze

Instance Method Summary collapse

Instance Method Details

#each_child(skip = 0) ⇒ Object 



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# File 'lib/alf/sql/nodes/expr.rb', line 56

def each_child(skip = 0)
  each_with_index do |c,i|
    next if i <= skip
    yield(c, i - 1)
  end
end

#join? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/alf/sql/nodes/expr.rb', line 34

def join?
  false
end

#limit_or_offset? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/alf/sql/nodes/expr.rb', line 30

def limit_or_offset?
  not(limit_clause.nil? and offset_clause.nil?)
end

#ordering ⇒ Object 



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# File 'lib/alf/sql/nodes/expr.rb', line 38

def ordering
  obc = order_by_clause
  obc && order_by_clause.to_ordering
end

#set_operator? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/alf/sql/nodes/expr.rb', line 26

def set_operator?
  false
end

#with_insert(index, what) ⇒ Object 



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# File 'lib/alf/sql/nodes/expr.rb', line 48

def with_insert(index, what)
  dup.tap{|x| x.insert(index, Grammar.sexpr(what)) }
end

#with_push(*sexprs) ⇒ Object 



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# File 'lib/alf/sql/nodes/expr.rb', line 52

def with_push(*sexprs)
  dup.push(*sexprs)
end

#with_update(index, what) ⇒ Object 



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# File 'lib/alf/sql/nodes/expr.rb', line 43

def with_update(index, what)
  index = find_child_index(index) if index.is_a?(Symbol)
  dup.tap{|x| x[index] = Grammar.sexpr(what) }
end