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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package match_test | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/defer-panic/dumbql/match" | ||
| "github.com/defer-panic/dumbql/query" | ||
| ) | ||
|
|
||
| type MatchUser struct { | ||
| ID int64 `dumbql:"id"` | ||
| Name string `dumbql:"name"` | ||
| Age int64 `dumbql:"age"` | ||
| Score float64 `dumbql:"score"` | ||
| Location string `dumbql:"location"` | ||
| Role string `dumbql:"role"` | ||
| } | ||
|
|
||
| func Example() { | ||
| users := []MatchUser{ | ||
| { | ||
| ID: 1, | ||
| Name: "John Doe", | ||
| Age: 30, | ||
| Score: 4.5, | ||
| Location: "New York", | ||
| Role: "admin", | ||
| }, | ||
| { | ||
| ID: 2, | ||
| Name: "Jane Smith", | ||
| Age: 25, | ||
| Score: 3.8, | ||
| Location: "Los Angeles", | ||
| Role: "user", | ||
| }, | ||
| { | ||
| ID: 3, | ||
| Name: "Bob Johnson", | ||
| Age: 35, | ||
| Score: 4.2, | ||
| Location: "Chicago", | ||
| Role: "user", | ||
| }, | ||
| // This one will be dropped: | ||
| { | ||
| ID: 4, | ||
| Name: "Alice Smith", | ||
| Age: 25, | ||
| Score: 3.8, | ||
| Location: "Los Angeles", | ||
| Role: "admin", | ||
| }, | ||
| } | ||
|
|
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| q := `(age >= 30 and score > 4.0) or (location:"Los Angeles" and role:"user")` | ||
| ast, _ := query.Parse("test", []byte(q)) | ||
| expr := ast.(query.Expr) | ||
|
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| matcher := &match.StructMatcher{} | ||
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| filtered := make([]MatchUser, 0, len(users)) | ||
|
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| for _, user := range users { | ||
| if expr.Match(&user, matcher) { | ||
| filtered = append(filtered, user) | ||
| } | ||
| } | ||
|
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| fmt.Println(filtered) | ||
| // Output: | ||
| // [{1 John Doe 30 4.5 New York admin} {2 Jane Smith 25 3.8 Los Angeles user} {3 Bob Johnson 35 4.2 Chicago user}] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| package match | ||
|
|
||
| import ( | ||
| "reflect" | ||
|
|
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| "github.com/defer-panic/dumbql/query" | ||
| ) | ||
|
|
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| // StructMatcher is a basic implementation of the Matcher interface for evaluating query expressions against structs. | ||
| // It supports struct tags using the `dumbql` tag name, which allows you to specify a custom field name. | ||
| type StructMatcher struct{} | ||
|
|
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| func (m *StructMatcher) MatchAnd(target any, left, right query.Expr) bool { | ||
| return left.Match(target, m) && right.Match(target, m) | ||
| } | ||
|
|
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| func (m *StructMatcher) MatchOr(target any, left, right query.Expr) bool { | ||
| return left.Match(target, m) || right.Match(target, m) | ||
| } | ||
|
|
||
| func (m *StructMatcher) MatchNot(target any, expr query.Expr) bool { | ||
| return !expr.Match(target, m) | ||
| } | ||
|
|
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| // MatchField matches a field in the target struct using the provided value and operator. It supports struct tags using | ||
| // the `dumbql` tag name, which allows you to specify a custom field name. If struct tag is not provided, it will use | ||
| // the field name as is. | ||
| func (m *StructMatcher) MatchField(target any, field string, value query.Valuer, op query.FieldOperator) bool { | ||
| t := reflect.TypeOf(target) | ||
|
|
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| if t.Kind() == reflect.Ptr { | ||
| t = t.Elem() | ||
| } | ||
|
|
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| if t.Kind() != reflect.Struct { | ||
| return false | ||
| } | ||
|
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| for i := 0; i < t.NumField(); i++ { | ||
| f := t.Field(i) | ||
|
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| tag := f.Tag.Get("dumbql") | ||
| if tag == "-" { | ||
| return true // Field marked with dumbql:"-" always match (in other words does not affect the result) | ||
| } | ||
|
|
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| fname := f.Name | ||
| if tag != "" { | ||
| fname = tag | ||
| } | ||
|
|
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| if fname == field { | ||
| v := reflect.ValueOf(target) | ||
| if v.Kind() == reflect.Ptr { | ||
| v = v.Elem() | ||
| } | ||
|
|
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| return m.MatchValue(v.Field(i).Interface(), value, op) | ||
| } | ||
| } | ||
|
|
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| return true | ||
| } | ||
|
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| func (m *StructMatcher) MatchValue(target any, value query.Valuer, op query.FieldOperator) bool { | ||
| return value.Match(target, op) | ||
| } |
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