Module: OracleSqlParser::Grammar::Expression

Includes:
Treetop::Runtime
Included in:
ExpressionParser, Grammar
Defined in:
lib/oracle-sql-parser/grammar/expression.rb

Defined Under Namespace

Modules: CaseExpression0, CaseExpression1, ComparisonExpr0, ElseClause0, ElseClause1, ElseExpr0, Expr0, ExpressionList0, ExpressionList1, ExpressionList2, Exprs0, Exprs1, Exprs2, FunctionArg0, FunctionArgs0, FunctionArgs1, FunctionArgs2, FunctionExpression0, FunctionExpression1, FunctionName0, FunctionName1, ReturnExpr0, SearchedCaseExpression0, SearchedCaseExpression1, SimpleCaseExpression0, SimpleCaseExpression1, SimpleCaseExpression2, SimpleExpression0, SimpleExpressionColumn0, SimpleExpressionColumn1, SimpleExpressionColumn2, SimpleExpressionColumn3, SimpleExpressionColumn4, SqlExpression0, SqlExpression1, SqlExpression2

Instance Method Summary collapse

Instance Method Details

#_nt_case_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 502

def _nt_case_expression
  start_index = index
  if node_cache[:case_expression].has_key?(index)
    cached = node_cache[:case_expression][index]
    if cached
      node_cache[:case_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_case_keyword
  s0 << r1
  if r1
    r3 = _nt_space
    if r3
      r2 = r3
    else
      r2 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r2
    if r2
      i4 = index
      r5 = _nt_simple_case_expression
      if r5
        r5 = SyntaxNode.new(input, (index-1)...index) if r5 == true
        r4 = r5
      else
        r6 = _nt_searched_case_expression
        if r6
          r6 = SyntaxNode.new(input, (index-1)...index) if r6 == true
          r4 = r6
        else
          @index = i4
          r4 = nil
        end
      end
      s0 << r4
      if r4
        r8 = _nt_space
        if r8
          r7 = r8
        else
          r7 = instantiate_node(SyntaxNode,input, index...index)
        end
        s0 << r7
        if r7
          r10 = _nt_else_clause
          if r10
            r9 = r10
          else
            r9 = instantiate_node(SyntaxNode,input, index...index)
          end
          s0 << r9
          if r9
            r12 = _nt_space
            if r12
              r11 = r12
            else
              r11 = instantiate_node(SyntaxNode,input, index...index)
            end
            s0 << r11
            if r11
              r13 = _nt_end_keyword
              s0 << r13
            end
          end
        end
      end
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(CaseExpression0)
    r0.extend(CaseExpression1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:case_expression][start_index] = r0

  r0
end

#_nt_comparison_expr ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 750

def _nt_comparison_expr
  start_index = index
  if node_cache[:comparison_expr].has_key?(index)
    cached = node_cache[:comparison_expr][index]
    if cached
      node_cache[:comparison_expr][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  r0 = _nt_expr
  r0.extend(ComparisonExpr0)
  r0.extend(ComparisonExpr0)

  node_cache[:comparison_expr][start_index] = r0

  r0
end

#_nt_compound_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 452

def _nt_compound_expression
  start_index = index
  if node_cache[:compound_expression].has_key?(index)
    cached = node_cache[:compound_expression][index]
    if cached
      node_cache[:compound_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if (match_len = has_terminal?('compound_expression', false, index))
    r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
    @index += match_len
  else
    terminal_parse_failure('\'compound_expression\'')
    r0 = nil
  end

  node_cache[:compound_expression][start_index] = r0

  r0
end

#_nt_cursor_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 973

def _nt_cursor_expression
  start_index = index
  if node_cache[:cursor_expression].has_key?(index)
    cached = node_cache[:cursor_expression][index]
    if cached
      node_cache[:cursor_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if (match_len = has_terminal?('cursor_expression', false, index))
    r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
    @index += match_len
  else
    terminal_parse_failure('\'cursor_expression\'')
    r0 = nil
  end

  node_cache[:cursor_expression][start_index] = r0

  r0
end

#_nt_datetime_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 997

def _nt_datetime_expression
  start_index = index
  if node_cache[:datetime_expression].has_key?(index)
    cached = node_cache[:datetime_expression][index]
    if cached
      node_cache[:datetime_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if (match_len = has_terminal?('datetime_expression', false, index))
    r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
    @index += match_len
  else
    terminal_parse_failure('\'datetime_expression\'')
    r0 = nil
  end

  node_cache[:datetime_expression][start_index] = r0

  r0
end

#_nt_else_clause ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 932

def _nt_else_clause
  start_index = index
  if node_cache[:else_clause].has_key?(index)
    cached = node_cache[:else_clause][index]
    if cached
      node_cache[:else_clause][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_else_keyword
  s0 << r1
  if r1
    r3 = _nt_space
    if r3
      r2 = r3
    else
      r2 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r2
    if r2
      r4 = _nt_else_expr
      s0 << r4
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(ElseClause0)
    r0.extend(ElseClause1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:else_clause][start_index] = r0

  r0
end

#_nt_else_expr ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 802

def _nt_else_expr
  start_index = index
  if node_cache[:else_expr].has_key?(index)
    cached = node_cache[:else_expr][index]
    if cached
      node_cache[:else_expr][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  r0 = _nt_expr
  r0.extend(ElseExpr0)
  r0.extend(ElseExpr0)

  node_cache[:else_expr][start_index] = r0

  r0
end

#_nt_expr ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1480

def _nt_expr
  start_index = index
  if node_cache[:expr].has_key?(index)
    cached = node_cache[:expr][index]
    if cached
      node_cache[:expr][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  r0 = _nt_sql_expression
  r0.extend(Expr0)
  r0.extend(Expr0)

  node_cache[:expr][start_index] = r0

  r0
end

#_nt_expression_list ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1623

def _nt_expression_list
  start_index = index
  if node_cache[:expression_list].has_key?(index)
    cached = node_cache[:expression_list][index]
    if cached
      node_cache[:expression_list][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0 = index
  i1, s1 = index, []
  if (match_len = has_terminal?('(', false, index))
    r2 = true
    @index += match_len
  else
    terminal_parse_failure('\'(\'')
    r2 = nil
  end
  s1 << r2
  if r2
    r3 = _nt_exprs
    s1 << r3
    if r3
      if (match_len = has_terminal?(')', false, index))
        r4 = true
        @index += match_len
      else
        terminal_parse_failure('\')\'')
        r4 = nil
      end
      s1 << r4
    end
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(ExpressionList0)
  else
    @index = i1
    r1 = nil
  end
  if r1
    r1 = SyntaxNode.new(input, (index-1)...index) if r1 == true
    r0 = r1
    r0.extend(ExpressionList2)
    r0.extend(ExpressionList2)
  else
    i5, s5 = index, []
    r6 = _nt_exprs
    s5 << r6
    if s5.last
      r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
      r5.extend(ExpressionList1)
    else
      @index = i5
      r5 = nil
    end
    if r5
      r5 = SyntaxNode.new(input, (index-1)...index) if r5 == true
      r0 = r5
      r0.extend(ExpressionList2)
      r0.extend(ExpressionList2)
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:expression_list][start_index] = r0

  r0
end

#_nt_exprs ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1526

def _nt_exprs
  start_index = index
  if node_cache[:exprs].has_key?(index)
    cached = node_cache[:exprs][index]
    if cached
      node_cache[:exprs][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_expr
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3, s3 = index, []
      r5 = _nt_space
      if r5
        r4 = r5
      else
        r4 = instantiate_node(SyntaxNode,input, index...index)
      end
      s3 << r4
      if r4
        if (match_len = has_terminal?(',', false, index))
          r6 = true
          @index += match_len
        else
          terminal_parse_failure('\',\'')
          r6 = nil
        end
        s3 << r6
        if r6
          r8 = _nt_space
          if r8
            r7 = r8
          else
            r7 = instantiate_node(SyntaxNode,input, index...index)
          end
          s3 << r7
          if r7
            r9 = _nt_expr
            s3 << r9
          end
        end
      end
      if s3.last
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        r3.extend(Exprs0)
      else
        @index = i3
        r3 = nil
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(Exprs1)
    r0.extend(Exprs2)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:exprs][start_index] = r0

  r0
end

#_nt_function_arg ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1310

def _nt_function_arg
  start_index = index
  if node_cache[:function_arg].has_key?(index)
    cached = node_cache[:function_arg][index]
    if cached
      node_cache[:function_arg][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  r0 = _nt_expr
  r0.extend(FunctionArg0)
  r0.extend(FunctionArg0)

  node_cache[:function_arg][start_index] = r0

  r0
end

#_nt_function_args ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1226

def _nt_function_args
  start_index = index
  if node_cache[:function_args].has_key?(index)
    cached = node_cache[:function_args][index]
    if cached
      node_cache[:function_args][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_function_arg
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3, s3 = index, []
      r5 = _nt_space
      if r5
        r4 = r5
      else
        r4 = instantiate_node(SyntaxNode,input, index...index)
      end
      s3 << r4
      if r4
        if (match_len = has_terminal?(',', false, index))
          r6 = true
          @index += match_len
        else
          terminal_parse_failure('\',\'')
          r6 = nil
        end
        s3 << r6
        if r6
          r8 = _nt_space
          if r8
            r7 = r8
          else
            r7 = instantiate_node(SyntaxNode,input, index...index)
          end
          s3 << r7
          if r7
            r9 = _nt_function_arg
            s3 << r9
          end
        end
      end
      if s3.last
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        r3.extend(FunctionArgs0)
      else
        @index = i3
        r3 = nil
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(FunctionArgs1)
    r0.extend(FunctionArgs2)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:function_args][start_index] = r0

  r0
end

#_nt_function_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1041

def _nt_function_expression
  start_index = index
  if node_cache[:function_expression].has_key?(index)
    cached = node_cache[:function_expression][index]
    if cached
      node_cache[:function_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_function_name
  s0 << r1
  if r1
    r3 = _nt_space
    if r3
      r2 = r3
    else
      r2 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r2
    if r2
      if (match_len = has_terminal?('(', false, index))
        r4 = true
        @index += match_len
      else
        terminal_parse_failure('\'(\'')
        r4 = nil
      end
      s0 << r4
      if r4
        r6 = _nt_space
        if r6
          r5 = r6
        else
          r5 = instantiate_node(SyntaxNode,input, index...index)
        end
        s0 << r5
        if r5
          r8 = _nt_function_args
          if r8
            r7 = r8
          else
            r7 = instantiate_node(SyntaxNode,input, index...index)
          end
          s0 << r7
          if r7
            r10 = _nt_space
            if r10
              r9 = r10
            else
              r9 = instantiate_node(SyntaxNode,input, index...index)
            end
            s0 << r9
            if r9
              if (match_len = has_terminal?(')', false, index))
                r11 = true
                @index += match_len
              else
                terminal_parse_failure('\')\'')
                r11 = nil
              end
              s0 << r11
            end
          end
        end
      end
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(FunctionExpression0)
    r0.extend(FunctionExpression1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:function_expression][start_index] = r0

  r0
end

#_nt_function_name ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1141

def _nt_function_name
  start_index = index
  if node_cache[:function_name].has_key?(index)
    cached = node_cache[:function_name][index]
    if cached
      node_cache[:function_name][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0 = index
  i1, s1 = index, []
  r2 = _nt_package_name
  s1 << r2
  if r2
    if (match_len = has_terminal?('.', false, index))
      r3 = true
      @index += match_len
    else
      terminal_parse_failure('\'.\'')
      r3 = nil
    end
    s1 << r3
    if r3
      r4 = _nt_procedure_name
      s1 << r4
    end
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(FunctionName0)
  else
    @index = i1
    r1 = nil
  end
  if r1
    r1 = SyntaxNode.new(input, (index-1)...index) if r1 == true
    r0 = r1
    r0.extend(FunctionName1)
    r0.extend(FunctionName1)
  else
    r5 = _nt_procedure_name
    if r5
      r5 = SyntaxNode.new(input, (index-1)...index) if r5 == true
      r0 = r5
      r0.extend(FunctionName1)
      r0.extend(FunctionName1)
    else
      @index = i0
      r0 = nil
    end
  end

  node_cache[:function_name][start_index] = r0

  r0
end

#_nt_interval_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1330

def _nt_interval_expression
  start_index = index
  if node_cache[:interval_expression].has_key?(index)
    cached = node_cache[:interval_expression][index]
    if cached
      node_cache[:interval_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if (match_len = has_terminal?('interval_expression', false, index))
    r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
    @index += match_len
  else
    terminal_parse_failure('\'interval_expression\'')
    r0 = nil
  end

  node_cache[:interval_expression][start_index] = r0

  r0
end

#_nt_model_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1402

def _nt_model_expression
  start_index = index
  if node_cache[:model_expression].has_key?(index)
    cached = node_cache[:model_expression][index]
    if cached
      node_cache[:model_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if (match_len = has_terminal?('model_expression', false, index))
    r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
    @index += match_len
  else
    terminal_parse_failure('\'model_expression\'')
    r0 = nil
  end

  node_cache[:model_expression][start_index] = r0

  r0
end

#_nt_object_access_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1354

def _nt_object_access_expression
  start_index = index
  if node_cache[:object_access_expression].has_key?(index)
    cached = node_cache[:object_access_expression][index]
    if cached
      node_cache[:object_access_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if (match_len = has_terminal?('object_access_expression', false, index))
    r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
    @index += match_len
  else
    terminal_parse_failure('\'object_access_expression\'')
    r0 = nil
  end

  node_cache[:object_access_expression][start_index] = r0

  r0
end

#_nt_return_expr ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 776

def _nt_return_expr
  start_index = index
  if node_cache[:return_expr].has_key?(index)
    cached = node_cache[:return_expr][index]
    if cached
      node_cache[:return_expr][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  r0 = _nt_expr
  r0.extend(ReturnExpr0)
  r0.extend(ReturnExpr0)

  node_cache[:return_expr][start_index] = r0

  r0
end

#_nt_scalar_subquery_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1378

def _nt_scalar_subquery_expression
  start_index = index
  if node_cache[:scalar_subquery_expression].has_key?(index)
    cached = node_cache[:scalar_subquery_expression][index]
    if cached
      node_cache[:scalar_subquery_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if (match_len = has_terminal?('scalar_subquery_expression', false, index))
    r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
    @index += match_len
  else
    terminal_parse_failure('\'scalar_subquery_expression\'')
    r0 = nil
  end

  node_cache[:scalar_subquery_expression][start_index] = r0

  r0
end

#_nt_searched_case_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 849

def _nt_searched_case_expression
  start_index = index
  if node_cache[:searched_case_expression].has_key?(index)
    cached = node_cache[:searched_case_expression][index]
    if cached
      node_cache[:searched_case_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_when_keyword
  s0 << r1
  if r1
    r3 = _nt_space
    if r3
      r2 = r3
    else
      r2 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r2
    if r2
      r4 = _nt_condition
      s0 << r4
      if r4
        r6 = _nt_space
        if r6
          r5 = r6
        else
          r5 = instantiate_node(SyntaxNode,input, index...index)
        end
        s0 << r5
        if r5
          r7 = _nt_then_keyword
          s0 << r7
          if r7
            r9 = _nt_space
            if r9
              r8 = r9
            else
              r8 = instantiate_node(SyntaxNode,input, index...index)
            end
            s0 << r8
            if r8
              r10 = _nt_return_expr
              s0 << r10
            end
          end
        end
      end
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(SearchedCaseExpression0)
    r0.extend(SearchedCaseExpression1)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:searched_case_expression][start_index] = r0

  r0
end

#_nt_simple_case_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 647

def _nt_simple_case_expression
  start_index = index
  if node_cache[:simple_case_expression].has_key?(index)
    cached = node_cache[:simple_case_expression][index]
    if cached
      node_cache[:simple_case_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_expr
  s0 << r1
  if r1
    r2 = _nt_space
    s0 << r2
    if r2
      s3, i3 = [], index
      loop do
        i4, s4 = index, []
        r5 = _nt_when_keyword
        s4 << r5
        if r5
          r6 = _nt_space
          s4 << r6
          if r6
            r7 = _nt_comparison_expr
            s4 << r7
            if r7
              r8 = _nt_space
              s4 << r8
              if r8
                r9 = _nt_then_keyword
                s4 << r9
                if r9
                  r11 = _nt_space
                  if r11
                    r10 = r11
                  else
                    r10 = instantiate_node(SyntaxNode,input, index...index)
                  end
                  s4 << r10
                  if r10
                    r12 = _nt_return_expr
                    s4 << r12
                    if r12
                      r14 = _nt_space
                      if r14
                        r13 = r14
                      else
                        r13 = instantiate_node(SyntaxNode,input, index...index)
                      end
                      s4 << r13
                    end
                  end
                end
              end
            end
          end
        end
        if s4.last
          r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
          r4.extend(SimpleCaseExpression0)
        else
          @index = i4
          r4 = nil
        end
        if r4
          s3 << r4
        else
          break
        end
      end
      if s3.empty?
        @index = i3
        r3 = nil
      else
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
      end
      s0 << r3
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(SimpleCaseExpression1)
    r0.extend(SimpleCaseExpression2)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:simple_case_expression][start_index] = r0

  r0
end

#_nt_simple_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 187

def _nt_simple_expression
  start_index = index
  if node_cache[:simple_expression].has_key?(index)
    cached = node_cache[:simple_expression][index]
    if cached
      node_cache[:simple_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0 = index
  r1 = _nt_rownum_keyword
  if r1
    r1 = SyntaxNode.new(input, (index-1)...index) if r1 == true
    r0 = r1
  else
    r2 = _nt_sysdate_keyword
    if r2
      r2 = SyntaxNode.new(input, (index-1)...index) if r2 == true
      r0 = r2
    else
      r3 = _nt_systimestamp_keyword
      if r3
        r3 = SyntaxNode.new(input, (index-1)...index) if r3 == true
        r0 = r3
      else
        r4 = _nt_null_keyword
        if r4
          r4 = SyntaxNode.new(input, (index-1)...index) if r4 == true
          r0 = r4
        else
          r5 = _nt_text_literal
          if r5
            r5 = SyntaxNode.new(input, (index-1)...index) if r5 == true
            r0 = r5
          else
            r6 = _nt_number_literal
            if r6
              r6 = SyntaxNode.new(input, (index-1)...index) if r6 == true
              r0 = r6
            else
              r7 = _nt_sequence
              if r7
                r7 = SyntaxNode.new(input, (index-1)...index) if r7 == true
                r0 = r7
              else
                r8 = _nt_simple_expression_column
                r8.extend(SimpleExpression0)
                r8.extend(SimpleExpression0)
                if r8
                  r8 = SyntaxNode.new(input, (index-1)...index) if r8 == true
                  r0 = r8
                else
                  @index = i0
                  r0 = nil
                end
              end
            end
          end
        end
      end
    end
  end

  node_cache[:simple_expression][start_index] = r0

  r0
end

#_nt_simple_expression_column ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 290

def _nt_simple_expression_column
  start_index = index
  if node_cache[:simple_expression_column].has_key?(index)
    cached = node_cache[:simple_expression_column][index]
    if cached
      node_cache[:simple_expression_column][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0, s0 = index, []
  i1, s1 = index, []
  i3 = index
  i4, s4 = index, []
  r5 = _nt_schema_name
  s4 << r5
  if r5
    r7 = _nt_space
    if r7
      r6 = r7
    else
      r6 = instantiate_node(SyntaxNode,input, index...index)
    end
    s4 << r6
    if r6
      if (match_len = has_terminal?('.', false, index))
        r8 = true
        @index += match_len
      else
        terminal_parse_failure('\'.\'')
        r8 = nil
      end
      s4 << r8
      if r8
        r10 = _nt_space
        if r10
          r9 = r10
        else
          r9 = instantiate_node(SyntaxNode,input, index...index)
        end
        s4 << r9
        if r9
          r11 = _nt_table_name
          s4 << r11
          if r11
            if (match_len = has_terminal?('.', false, index))
              r12 = true
              @index += match_len
            else
              terminal_parse_failure('\'.\'')
              r12 = nil
            end
            s4 << r12
          end
        end
      end
    end
  end
  if s4.last
    r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
    r4.extend(SimpleExpressionColumn0)
  else
    @index = i4
    r4 = nil
  end
  if r4
    r4 = SyntaxNode.new(input, (index-1)...index) if r4 == true
    r3 = r4
  else
    i13, s13 = index, []
    r14 = _nt_table_name
    s13 << r14
    if r14
      r16 = _nt_space
      if r16
        r15 = r16
      else
        r15 = instantiate_node(SyntaxNode,input, index...index)
      end
      s13 << r15
      if r15
        if (match_len = has_terminal?('.', false, index))
          r17 = true
          @index += match_len
        else
          terminal_parse_failure('\'.\'')
          r17 = nil
        end
        s13 << r17
        if r17
          r19 = _nt_space
          if r19
            r18 = r19
          else
            r18 = instantiate_node(SyntaxNode,input, index...index)
          end
          s13 << r18
        end
      end
    end
    if s13.last
      r13 = instantiate_node(SyntaxNode,input, i13...index, s13)
      r13.extend(SimpleExpressionColumn1)
    else
      @index = i13
      r13 = nil
    end
    if r13
      r13 = SyntaxNode.new(input, (index-1)...index) if r13 == true
      r3 = r13
    else
      @index = i3
      r3 = nil
    end
  end
  if r3
    r2 = r3
  else
    r2 = instantiate_node(SyntaxNode,input, index...index)
  end
  s1 << r2
  if r2
    i20 = index
    r21 = _nt_rowid_keyword
    if r21
      r21 = SyntaxNode.new(input, (index-1)...index) if r21 == true
      r20 = r21
    else
      r22 = _nt_column_name
      if r22
        r22 = SyntaxNode.new(input, (index-1)...index) if r22 == true
        r20 = r22
      else
        @index = i20
        r20 = nil
      end
    end
    s1 << r20
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(SimpleExpressionColumn2)
  else
    @index = i1
    r1 = nil
  end
  s0 << r1
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(SimpleExpressionColumn3)
    r0.extend(SimpleExpressionColumn4)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:simple_expression_column][start_index] = r0

  r0
end

#_nt_sql_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 49

def _nt_sql_expression
  start_index = index
  if node_cache[:sql_expression].has_key?(index)
    cached = node_cache[:sql_expression][index]
    if cached
      node_cache[:sql_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  i0, s0 = index, []
  i1 = index
  r2 = _nt_function_expression
  if r2
    r2 = SyntaxNode.new(input, (index-1)...index) if r2 == true
    r1 = r2
  else
    r3 = _nt_case_expression
    if r3
      r3 = SyntaxNode.new(input, (index-1)...index) if r3 == true
      r1 = r3
    else
      r4 = _nt_cursor_expression
      if r4
        r4 = SyntaxNode.new(input, (index-1)...index) if r4 == true
        r1 = r4
      else
        r5 = _nt_compound_expression
        if r5
          r5 = SyntaxNode.new(input, (index-1)...index) if r5 == true
          r1 = r5
        else
          r6 = _nt_datetime_expression
          if r6
            r6 = SyntaxNode.new(input, (index-1)...index) if r6 == true
            r1 = r6
          else
            r7 = _nt_interval_expression
            if r7
              r7 = SyntaxNode.new(input, (index-1)...index) if r7 == true
              r1 = r7
            else
              r8 = _nt_object_access_expression
              if r8
                r8 = SyntaxNode.new(input, (index-1)...index) if r8 == true
                r1 = r8
              else
                r9 = _nt_scalar_subquery_expression
                if r9
                  r9 = SyntaxNode.new(input, (index-1)...index) if r9 == true
                  r1 = r9
                else
                  r10 = _nt_model_expression
                  if r10
                    r10 = SyntaxNode.new(input, (index-1)...index) if r10 == true
                    r1 = r10
                  else
                    r11 = _nt_type_constructor_expression
                    if r11
                      r11 = SyntaxNode.new(input, (index-1)...index) if r11 == true
                      r1 = r11
                    else
                      r12 = _nt_simple_expression
                      if r12
                        r12 = SyntaxNode.new(input, (index-1)...index) if r12 == true
                        r1 = r12
                      else
                        r13 = _nt_variable_expression
                        if r13
                          r13 = SyntaxNode.new(input, (index-1)...index) if r13 == true
                          r1 = r13
                        else
                          @index = i1
                          r1 = nil
                        end
                      end
                    end
                  end
                end
              end
            end
          end
        end
      end
    end
  end
  s0 << r1
  if r1
    i15, s15 = index, []
    r16 = _nt_space
    s15 << r16
    if r16
      r17 = _nt_as_keyword
      s15 << r17
      if r17
        r18 = _nt_space
        s15 << r18
        if r18
          r19 = _nt_ident
          s15 << r19
        end
      end
    end
    if s15.last
      r15 = instantiate_node(SyntaxNode,input, i15...index, s15)
      r15.extend(SqlExpression0)
    else
      @index = i15
      r15 = nil
    end
    if r15
      r14 = r15
    else
      r14 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r14
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(SqlExpression1)
    r0.extend(SqlExpression2)
  else
    @index = i0
    r0 = nil
  end

  node_cache[:sql_expression][start_index] = r0

  r0
end

#_nt_type_constructor_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1426

def _nt_type_constructor_expression
  start_index = index
  if node_cache[:type_constructor_expression].has_key?(index)
    cached = node_cache[:type_constructor_expression][index]
    if cached
      node_cache[:type_constructor_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if (match_len = has_terminal?('type_constructor_expression', false, index))
    r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
    @index += match_len
  else
    terminal_parse_failure('\'type_constructor_expression\'')
    r0 = nil
  end

  node_cache[:type_constructor_expression][start_index] = r0

  r0
end

#_nt_variable_expression ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 1450

def _nt_variable_expression
  start_index = index
  if node_cache[:variable_expression].has_key?(index)
    cached = node_cache[:variable_expression][index]
    if cached
      node_cache[:variable_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
      @index = cached.interval.end
    end
    return cached
  end

  if (match_len = has_terminal?('variable_expression', false, index))
    r0 = instantiate_node(SyntaxNode,input, index...(index + match_len))
    @index += match_len
  else
    terminal_parse_failure('\'variable_expression\'')
    r0 = nil
  end

  node_cache[:variable_expression][start_index] = r0

  r0
end

#root ⇒ Object 



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# File 'lib/oracle-sql-parser/grammar/expression.rb', line 8

def root
  @root ||= :sql_expression
end