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part.go
61 lines (49 loc) · 1 KB
/
part.go
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package statement
import (
"fmt"
"strings"
)
type part struct {
query string
values []interface{}
}
func (p *part) String() (q string, err error) {
var buf strings.Builder
if err = p.Build(&buf); err != nil {
return "", err
}
return buf.String(), nil
}
func (p *part) Build(buf Buffer) (err error) {
return p.build(buf, false)
}
func (p *part) build(buf Buffer, keyword bool) (err error) {
if strings.Count(p.query, "?") != len(p.values) {
return fmt.Errorf("%w: %s, %#v", ErrInvalidArgNumber, p.query, p.values)
}
valueIdx := 0
query := p.query
for {
idx := strings.Index(query, "?")
if idx == -1 {
_, _ = buf.WriteString(query)
break
}
_, _ = buf.WriteString(query[:idx])
query = query[idx+1:]
arg := p.values[valueIdx]
valueIdx++
switch arg := arg.(type) {
case Statement:
_, _ = buf.WriteString("(")
err = arg.Build(buf)
_, _ = buf.WriteString(")")
default:
err = writeValue(buf, arg, keyword)
}
if err != nil {
return err
}
}
return nil
}