parser

type Boolean bool

type Compare struct {
	Operator string   `@( "<=" | ">=" | "=" | "<" | ">" | "!=" )`
	Operand  *Operand `(  @@`
	Select   *Operand ` | @@ )`
}

type Condition struct {
	Operand *ConditionOperand `  @@`
	Not     *Condition        `| "NOT" @@`
}

type ConditionOperand struct {
	Operand      *Operand      `@@`
	ConditionRHS *ConditionRHS `[ @@ ]`
}

type ConditionRHS struct {
	Compare     *Compare     `  @@`
	Like        *Like        `| "LIKE" @@`
	NotLike     *NotLike     `| "NOT" "LIKE" @@`
	Contains    *Contains    `| "CONTAINS" @@`
	NotContains *NotContains `| "NOT" "CONTAINS" @@`
}

type Contains struct {
	Operand *Operand `@@`
}

type Expression struct {
	Or []*OrCondition `@@ { "OR" @@ }`
}

type Like struct {
	Operand *Operand `@@`
}

type MongoQuery interface {
	Query() bson.M
	ExprQuery() bson.M
	GetFields() []string
}

type NotContains struct {
	Operand *Operand `@@`
}

type NotLike struct {
	Operand *Operand `@@`
}

type Operand struct {
	Terms []*Term `@@ { @@ }`
}

type OrCondition struct {
	And []*Condition `@@ { "AND" @@ }`
}

type Parser interface {
	Parse(string) (MongoQuery, error)
}

type Term struct {
	Name        *string  `(@Ident`
	NumberFloat *float64 ` | @Float`
	NumberInt   *int     ` | @Int`
	Str         *string  ` | @String`
	Boolean     *Boolean ` | @("TRUE" | "FALSE")`
	Null        bool     ` | @"NULL" )`
}