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feat: parse search query in datav plugin #290
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| sb "github.com/huandu/go-sqlbuilder" | ||
| lep "github.com/mgudov/logic-expression-parser" | ||
| ) | ||
|
|
||
| func ParseSearchQuery(query string) (string, []interface{}, error) { | ||
| result, err := lep.ParseExpression(query) | ||
| if err != nil { | ||
| return "", nil, err | ||
| } | ||
|
|
||
| sql := sb.NewSelectBuilder() | ||
| where, err := traverse(sql, result) | ||
| if err != nil { | ||
| return "", nil, err | ||
| } | ||
| sql.Where(where) | ||
| s, args := sql.Build() | ||
|
|
||
| if s == "" { | ||
| return "", nil, nil | ||
| } | ||
|
|
||
| return "AND " + s[5:], args, nil | ||
| } | ||
|
|
||
| func traverse(sql *sb.SelectBuilder, expr lep.Expression) (string, error) { | ||
| switch e := expr.(type) { | ||
| default: | ||
| return "", fmt.Errorf("not implemented: %T", e) | ||
| case *lep.OrX: | ||
| var args []string | ||
| for _, disjunction := range e.Disjunctions { | ||
| arg, err := traverse(sql, disjunction) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| args = append(args, arg) | ||
| } | ||
| return sql.Or(args...), nil | ||
| case *lep.AndX: | ||
| var args []string | ||
| for _, conjunct := range e.Conjuncts { | ||
| arg, err := traverse(sql, conjunct) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| args = append(args, arg) | ||
| } | ||
| return sql.And(args...), nil | ||
| case *lep.EqualsX: | ||
| value := e.Value.Value() | ||
| if value == nil { | ||
| return sql.IsNotNull(e.Param.String()), nil | ||
| } | ||
| return sql.Equal(e.Param.String(), value), nil | ||
| case *lep.NotEqualsX: | ||
| value := e.Value.Value() | ||
| if value == nil { | ||
| return sql.IsNotNull(e.Param.String()), nil | ||
| } | ||
| return sql.NotEqual(e.Param.String(), value), nil | ||
| case *lep.GreaterThanX: | ||
| return sql.GreaterThan(e.Param.String(), e.Value.Value()), nil | ||
| case *lep.InSliceX: | ||
| var items []interface{} | ||
| for _, value := range e.Slice.Values { | ||
| items = append(items, value.Value()) | ||
| } | ||
| return sql.In(e.Param.String(), items...), nil | ||
|
|
||
| // TODO: other cases | ||
| } | ||
| } |
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