Class: FluentQuery::Drivers::Shared::Tokens::SQL::From

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

Overview

Generic SQL query WHERE 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/from.rb', line 22

def render!(mode = :build)
    _class = self.unknown_token
    
    stack = [ ]
    unknown = [ ]
    
    processor = @_query.processor
    operator = @_driver.quote_operator(:and)

    result = "FROM "

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

        # Known process
        if token.name == :from
            length = arguments.length
            first = arguments.first
            
            if length > 0
                if first.symbol?
                    stack << processor.process_identifiers(arguments)
                elsif (length > 1) or (first.string?)
                    stack << processor.process_formatted(arguments, mode)
                elsif first.array?
                    stack << first.join(operator)
                elsif first.hash?
                    stack << processor.process_hash(first, operator)
                end
            end

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

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

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

    # Process stack with results
    first = true
    
    stack.each do |item|
        if item.kind_of? _class
            result << item.render!
        elsif item.string?
            if not first
                result << operator << " "
            else
                first = false
            end
            
            result << item
        end

        result << " "
    end

    return result
end