79 lines
2.3 KiB
Ruby
79 lines
2.3 KiB
Ruby
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require './parser'
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class TextToSqlQuery
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def initialize(text, fields, default_field, fields_mappings = {})
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@text = text.to_s.strip
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@fields = fields.map(&:to_sym)
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@default_field = default_field.to_sym
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@fields_mappings = fields_mappings.merge(@fields.reduce({}) do |mappings, field|
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_table_name, field_name = field.to_s.split('.')
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mappings[field_name.to_sym] = field
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mappings
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end)
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end
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def where_clause
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@parser = Query.new
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@parsed_tree = @parser.parse(@text)
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generate_sql @parsed_tree
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end
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private
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def generate_sql(tree)
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@first_key = tree.keys.first
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case @first_key
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when :DEFAULT_COLUMN
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["#{@default_field.to_s} LIKE ?", "%#{tree[@first_key]}%"]
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when :OPERATOR_OR
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generate_expression_for_logical_operator(:OR, tree[@first_key])
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when :OPERATOR_AND
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generate_expression_for_logical_operator(:AND, tree[@first_key])
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when :OPERATOR_NOT
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@not_array = generate_sql tree[@first_key]
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if @not_array.length < 2
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raise "There should be more than 1 element for expression following NOT operator"
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end
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@not_expression = @not_array.first
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@not_params = @not_array[1..]
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["NOT #{@not_expression}"] + @not_params
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else
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# key is column name
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@mapping = @fields_mappings[@first_key.to_sym]
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if @mapping.nil?
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["#{@default_field.to_s} LIKE ?", "%#{tree[@first_key]}%"]
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else
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["#{@mapping.to_s} LIKE ?", "%#{tree[@first_key]}%"]
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end
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end
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end
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def generate_expression_for_logical_operator(operator, operator_array)
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if operator_array.length != 2
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raise "There should be two array elements for #{operator.to_s} operator"
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end
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@first_operand = generate_sql operator_array.first
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@second_operand = generate_sql operator_array.last
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if @first_operand.length < 2
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raise 'There should be more than 1 element in first operand array'
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end
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if @second_operand.length < 2
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raise 'There should be more than 1 element in second operand array'
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end
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@first_operand_expression = @first_operand.first
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@first_operand_params = @first_operand[1..]
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@second_operand_expression = @second_operand.first
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@second_operand_params = @second_operand[1..]
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["#{@first_operand_expression} #{operator.to_s} #{@second_operand_expression}"] + @first_operand_params + @second_operand_params
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end
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end
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