Class: FluentQuery::Drivers::Shared::Tokens::SQL::OrderBy

Inherits:
FluentQuery::Drivers::Shared::Tokens::SQLToken show all
Defined in:
lib/fluent-query/drivers/shared/tokens/sql/orderby.rb

Overview

Generic SQL query ORDER BY token.

Constant Summary

Constants inherited from FluentQuery::Drivers::Shared::Tokens::SQLToken

FluentQuery::Drivers::Shared::Tokens::SQLToken::TRANSFORMER

Instance Method Summary collapse

Methods inherited from FluentQuery::Drivers::Shared::Tokens::SQLToken

#initialize

Constructor Details

This class inherits a constructor from FluentQuery::Drivers::Shared::Tokens::SQLToken

Instance Method Details

#render!(mode = :build) ⇒ Object 



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# File 'lib/fluent-query/drivers/shared/tokens/sql/orderby.rb', line 22

def render!(mode = :build)
    
    stack = [ ]
    custom = [ ]
    unknown = [ ]
    fields = [ ]
    distinct = false
    
    result = "ORDER BY "
    processor = @_query.processor
    _class = self.unknown_token


    # Process subtokens
    
    @_subtokens.each do |token|
        arguments = token.arguments
        name = token.name

        # Known select process
        if name == :orderBy
            length = arguments.length
            close_custom = false
            
            if length > 0
                if (length > 1) or (arguments.first.string?)
                    value = processor.process_formatted(arguments, mode).dup
                    custom.push(value)

                    # Closes fields if they are set
                    if not fields.empty?
                        stack << (processor.process_identifiers(fields) << ", ")
                        fields = [ ]
                    end
                    
                elsif arguments.first.array?
                    fields += arguments.first
                    close_custom = true
                    
                elsif arguments.first.symbol?
                    fields += arguments
                    close_custom = true

                end
                
                # Closes custom formulations if they are set
                #  and it's required.
                if close_custom and not custom.empty?
                    stack << (self._close_custom(custom) << ", ")
                    custom = [ ]
                end
            end

            # Closes opened native token with unknown tokens
            if unknown.length > 0
                native = _class::new(@_driver, @_query, unknown)
                stack << (native.render! + ", ")
                unknown = [ ]
            end

        # Unknowns arguments pushes to the general native token
        else
            unknown << token

            if not fields.empty?
                stack << processor.process_identifiers(fields)
                fields = [ ]
            elsif not custom.empty?
                stack << self._close_custom(custom)
                custom = [ ]
            end
        end
    end

    # Closes

        # Opened native token with unknown tokens
        if unknown.length > 0
            native = _class::new(@_driver, @_query, unknown)
            value = native.render!
            unknown = [ ]

            if (not fields.empty?) or (not custom.empty?)
                value << ", "
            end
            
            stack << value
        end

        # Fields list
        if not fields.empty?
            value = processor.process_identifiers(fields)

            if not custom.empty?
                value << ", "
            end

            stack << value
        end

        # Custom list
        if not custom.empty?
            stack << self._close_custom(custom)
        end

    # Process stack with results
    result << stack.join(" ")

    return result

end