zikes / rql

An RQL parser https://github.com/persvr/rql

rql

RQL is a simple, composable query language that's easy to read and write, without being ambiguous.

Operators, comparators, and functions all take the form expressionName(operand, ...). Operands may also be expressions, allowing you to nest as deeply as necessary.

or(eq(my_column,12),and(gt(my_column,20),lt(my_column,30))

In SQL, the above would be

[...] WHERE my_column=12 OR (my_column > 20 AND my_column < 30)

Operators

name	usage	description
eq	eq(value, value)	Test equality.
neq	neq(value, value)	Test inequality.
and	and(value, value)	Logical and.
or	or(value, value)	Logical or.
not	not(value)	Logical not.
lt	lt(value, value)	Less than comparison.
gt	gt(value, value)	Greater than comparison.
le	le(value, value)	Less than or equals comparison.
ge	ge(value, value)	Greater than or equals comparison.
in	in(col, (1,2,3))	Check if value is one of a series.

Literals

name	usage	description
string	eq(value, "string")	String literal data type.
numeric	neq(value, -12.123)	Numeric literal data type.
boolean	and(value, true)	Boolean literal data type.
null	or(value, null)	Null literal data type.
identifier	not(my_col)	Identifier literal data type.

Arrays

name	usage	description
ExpressionList	(val,val,val,[...])	Collects a list of values and presents them as a single value.

Parser

import (
  "fmt"

  goquadapter "github.com/zikes/rql/adapters/goqu"
  rql "github.com/zikes/rql/parse"
)

func main() {
  rqlString := `eq(id,12)`
  ast, err := rql.New("root").Parse(rqlString)
  if err != nil {
    fmt.Printf("Error parsing RQL: %s", err)
    return
  }

  ex := goquadapter.ToGoqu(ast)
  fmt.Printf("%+v", ex)
}