Class: TrinoSqlParser

Inherits:
Object
  • Object
show all
Extended by:
ClassMethods
Defined in:
lib/trino_sql_parser.rb,
lib/trino_sql_parser/version.rb,
lib/trino_sql_parser/support_process.rb

Defined Under Namespace

Modules: ClassMethods Classes: ParseError, SupportProcess

Constant Summary collapse

VERSION = 
"1.1.0"

Instance Attribute Summary

Attributes included from ClassMethods

#jar_path, #java_args, #java_cmd, #java_env

Instance Method Summary collapse

Constructor Details

#initialize(with_tokens: false) ⇒ TrinoSqlParser

Returns a new instance of TrinoSqlParser.



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# File 'lib/trino_sql_parser.rb', line 38

def initialize(with_tokens: false)
  @support_process = SupportProcess.new(with_tokens: with_tokens)
end

Instance Method Details

#parse(sql) ⇒ Object 



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# File 'lib/trino_sql_parser.rb', line 42

def parse(sql)
  unless sql.is_a?(String)
    raise ArgumentError, "SQL must be a String but got #{sql.class}"
  end
  request_line = JSON.dump({"sql" => sql})

  success = false
  begin
    @support_process.send_line(request_line)
    response_line = @support_process.receive_line
    raise "Process crashed" unless response_line
    response = JSON.parse(response_line)
    statements = response['statements']
    errors = response['errors']
    success = true
  rescue => e
    raise "Support process failed with an error: #{e}"
  ensure
    @support_process.kill! unless success
  end

  if errors
    raise ParseError.new(errors)
  end

  statements.map do |h|
    h.reject! {|k, v| v == nil }
  end

  statements
end