forked from tomcfoglio/mycenae
/
func_filter.go
41 lines (30 loc) · 854 Bytes
/
func_filter.go
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package parser
import (
"fmt"
"github.com/uol/gobol"
"github.com/uol/mycenae/lib/structs"
)
func parseFilter(exp string, tsdb *structs.TSDBquery) (string, gobol.Error) {
params := parseParams(string(exp[6:]))
if len(params) != 2 {
return "", errParams(
"parseFilter",
"filter needs 2 parameters: >, >=, <, <=, == followed by a number and a function",
fmt.Errorf("filter expects 2 parameters but found %d: %v", len(params), params),
)
}
tsdb.FilterValue = params[0]
for _, oper := range tsdb.Order {
if oper == "filterValue" {
return "", errDoubleFunc("parseFilter", "filter")
}
}
tsdb.Order = append([]string{"filterValue"}, tsdb.Order...)
return params[1], nil
}
func writeFilter(exp, filterValue string) string {
if filterValue != "" {
return fmt.Sprintf("filter(%s,%s)", filterValue, exp)
}
return exp
}