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GRAMMAR.md

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MQL Grammar

In a general form, a mql query defines a condition which must be satisfied and any resource not satisfying this condition will be eliminated from output.

A condition is any expression that evaluates to a result of type boolean.

keywords (case-insensitive)

  • and
  • or

tokens

  • eq: =
  • gte: >=
  • gt: >
  • lte: <=
  • lt: <
  • ne: !=
  • lparen: (
  • rparen: )
  • contains: %
  • string: example
  • quote: "

productions

condition

<comparison expr> | <logical expr>

comparison expr

(lparen)? <column> (<whitespace>)? <comparison operator> (<whitespace>)? <value> (<rparen)?

logical expr

(lparen)? <logical expr> | <comparison expr> <logical operator> <logical expr> | <comparison expr> (<rparen)?

symbol

  • <string>

string

  • <string>

quoted string

A string delimited by quotes. You can escape quotes with a backslash \" and you can escape a backslash with a second backslash \\ . Supported delimiters: double-quotes, single-quotes, backtick.

  • <quote> <string> <quote>

value

A string (quoted or not) which is the value of a column used in a comparison expr. The string must be a valid value/type for the column which will be enforced by the RDBMS when the query is executed.

  • <string>

column identifier

An identifier string token that forms a column name and must match a name in the Go struct used in conjunction with the query and of course it must be a valid column name for the resource being queried in the RDBMS.

  • <symbol>

comparison operator

  • <eq>
  • <gte>
  • <gt>
  • <lte>
  • <lt>
  • <ne>

logical operator

  • <and>
  • <or>