super-graph/core/internal/psql/metadata.go

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package psql
import (
"io"
)
func (md *Metadata) RenderVar(w io.Writer, vv string) {
f, s := -1, 0
for i := range vv {
v := vv[i]
switch {
case (i > 0 && vv[i-1] != '\\' && v == '$') || v == '$':
if (i - s) > 0 {
_, _ = io.WriteString(w, vv[s:i])
}
f = i
case (v < 'a' && v > 'z') &&
(v < 'A' && v > 'Z') &&
(v < '0' && v > '9') &&
v != '_' &&
f != -1 &&
(i-f) > 1:
md.renderValueExp(w, Param{Name: vv[f+1 : i]})
s = i
f = -1
}
}
if f != -1 && (len(vv)-f) > 1 {
md.renderValueExp(w, Param{Name: vv[f+1:]})
} else {
_, _ = io.WriteString(w, vv[s:])
}
}
func (md *Metadata) renderValueExp(w io.Writer, p Param) {
_, _ = io.WriteString(w, `$`)
if v, ok := md.pindex[p.Name]; ok {
int32String(w, int32(v))
} else {
md.params = append(md.params, p)
n := len(md.params)
if md.pindex == nil {
md.pindex = make(map[string]int)
}
md.pindex[p.Name] = n
int32String(w, int32(n))
}
}
func (md Metadata) Skipped() uint32 {
return md.skipped
}
func (md Metadata) Params() []Param {
return md.params
}