90 lines
1.5 KiB
Go
90 lines
1.5 KiB
Go
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package main
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import (
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"git.xdrm.io/go/aicra/driver"
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"regexp"
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"strconv"
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)
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func main() {}
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func Export() driver.Checker { return new(VarcharChecker) }
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var min *uint64
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var max *uint64
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type VarcharChecker struct {
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min *uint64
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max *uint64
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}
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// Match filters the parameter type format "varchar(min, max)"
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func (vck *VarcharChecker) Match(name string) bool {
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vck.min = nil
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vck.max = nil
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/* (1) Create regexp */
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re, err := regexp.Compile(`^varchar\((\d+), ?(\d+)\)$`)
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if err != nil {
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panic(err)
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}
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/* (2) Check if matches */
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matches := re.FindStringSubmatch(name)
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if matches == nil || len(matches) < 3 {
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return false
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}
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/* (3) Extract min */
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minVal, err := strconv.ParseUint(matches[1], 10, 64)
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if err != nil {
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return false
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}
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vck.min = &minVal
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/* (4) Extract max */
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maxVal, err := strconv.ParseUint(matches[2], 10, 64)
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if err != nil {
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return false
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}
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/* (5) Check that min <= max */
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if maxVal < minVal {
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panic("varchar(x, y) ; constraint violation : x <= y")
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}
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vck.max = &maxVal
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return true
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}
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// Check whether the given value fulfills the condition (min, max)
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func (vck *VarcharChecker) Check(value interface{}) bool {
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/* (1) Check if string */
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strval, ok := value.(string)
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if !ok {
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return false
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}
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/* (2) Check if sizes set */
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if vck.min == nil || vck.max == nil {
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return false
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}
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length := uint64(len(strval))
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/* (3) Check min */
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if length < *vck.min {
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return false
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}
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/* (4) Check max */
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if length > *vck.max {
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return false
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}
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return true
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}
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