Class: ClickHouse::Ast::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/click_house/ast/parser.rb

Constant Summary collapse

OPEN = 
'('
CLOSED = 
')'
COMMA = 
','
SPACE = 
' '

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Parser

Returns a new instance of Parser.

Parameters:

  • input (String) 


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# File 'lib/click_house/ast/parser.rb', line 16

def initialize(input)
  @input = input
end

Instance Attribute Details

#input ⇒ Object (readonly)

Returns the value of attribute input.



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# File 'lib/click_house/ast/parser.rb', line 13

def input
  @input
end

Instance Method Details

#parse ⇒ Object

Map(String, Decimal(10, 5)) Array(Array(Array(Array(Nullable(Int, String)))))



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# File 'lib/click_house/ast/parser.rb', line 23

def parse
  ticker = Ticker.new
  control = false

  input.each_char do |char|
    # cases like (1,<space after comma> 3)
    next if control && char == SPACE

    case char
    when OPEN
      control = true
      ticker.open
    when CLOSED
      control = true
      ticker.close
    when COMMA
      control = true
      ticker.comma
    else
      control = false
      ticker.char(char)
    end
  end

  # if a single type like "Int"
  ticker.current.name! unless control
  ticker.current
end