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| {
package parser
type Conditions struct {
Group *Conditions `json:"group,omitempty"`
Value *Condition `json:"value,omitempty"`
Logical string `json:"logical,omitempty"`
Next *Conditions `json:"next,omitempty"`
}
type Condition struct {
Key string `json:"key,omitempty"`
Operator string `json:"operator,omitempty"`
Value string `json:"value,omitempty"`
Values []string `json:"values,omitempty"`
}
}
Grammar <- values:Conditions+ EOF {
return values.([]interface{})[0].(*Conditions), nil
} / SyntaxError
SyntaxError <- . {
return nil, errors.New("parser: syntax error")
}
ConditionGroup <- '(' __ values: Conditions* __ ')' {
if len(values.([]interface{})) == 0 {
return nil, nil
}
return values.([]interface{})[0].(*Conditions), nil
}
Conditions <- values:( ( Condition / ConditionGroup ) __ LogicalOperator? __ )+ {
head := &Conditions{}
cur := head
lastIndex := len(values.([]interface{})) - 1
for index, value := range values.([]interface{}) {
args := value.([]interface{})
switch arg0 := args[0].(type) {
case *Condition:
cur.Value = arg0
case *Conditions:
cur.Group = arg0
}
cur.Logical, _ = args[2].(string)
if index == lastIndex {
break
}
cur.Next = &Conditions{}
cur = cur.Next
}
return head, nil
}
LogicalOperator <- ( "and" / "or" ) {
return string(c.text), nil
}
Condition <- key:Identifier __ op:Operator __ value:( Double / Integer / String / List) {
ret := &Condition{
Key: key.(string),
Operator: op.(string),
}
if vs, isOK := value.([]string); isOK {
ret.Values = vs
}
if v, isOK := value.(string); isOK {
ret.Value = v
}
return ret, nil
}
Integer <- '-'? Digit+ {
if _, err := strconv.ParseInt(string(c.text), 10, 64); err != nil {
return nil, err
}
return string(c.text), nil
}
Double ← [+-]? Digit+ '.' Digit+ {
if _, err := strconv.ParseFloat(string(c.text), 64); err != nil {
return nil, err
}
return string(c.text), nil
}
String <- Literal
List <- '(' __ values:(Literal __ ListSeparator? __)* __ ')' {
result := make([]string, 0)
for _, value := range values.([]interface{}) {
args, _ := value.([]interface{})
result = append(result, args[0].(string))
}
return result, nil
}
Literal <- (('"' (`\"` / [^"])* '"') / ('\'' (`\'` / [^'])* '\'')) {
if len(c.text) == 0 {
return "", nil
}
switch c.text[0] {
case '\'':
return strings.Replace(string(c.text[1:len(c.text)-1]), `\'`, `'`, -1), nil
case '"':
return strings.Replace(string(c.text[1:len(c.text)-1]), `\"`, `"`, -1), nil
}
return string(c.text) ,nil
}
Operator <- ( "in" / ">=" / "<=" / "!=" / "=" / ">" / "<" ) {
return string(c.text), nil
}
Identifier <- (Letter / '_')+ (Letter / Digit / '.' / '_' / '[' / ']' )* {
return string(c.text), nil
}
ListSeparator <- [,]
Letter <- [A-Za-z]
Digit <- [0-9]
__ <- (_)*
_ <- [ \n\t\r]+
EOF <- !.
|
