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Avoid the memory allocation of WriteString #189

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merged 1 commit into from
Aug 6, 2024
Merged

Avoid the memory allocation of WriteString #189

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24 changes: 17 additions & 7 deletions compiler.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ package plush

import (
"fmt"
"unsafe"

"github.com/gobuffalo/plush/v4/token"

Expand Down Expand Up @@ -73,24 +74,24 @@ func (c *compiler) write(bb *strings.Builder, i interface{}) {
switch t := i.(type) {
case time.Time:
if dtf, ok := c.ctx.Value("TIME_FORMAT").(string); ok {
bb.WriteString(t.Format(dtf))
bb.Write(unsafeGetBytes(t.Format(dtf)))
return
}
bb.WriteString(t.Format(DefaultTimeFormat))
bb.Write(unsafeGetBytes(t.Format(DefaultTimeFormat)))
case *time.Time:
c.write(bb, *t)
case interfaceable:
c.write(bb, t.Interface())
case string, ast.Printable, bool:
bb.WriteString(template.HTMLEscaper(t))
bb.Write(unsafeGetBytes(template.HTMLEscaper(t)))
case template.HTML:
bb.WriteString(string(t))
bb.Write(unsafeGetBytes(string(t)))
case HTMLer:
bb.WriteString(string(t.HTML()))
bb.Write(unsafeGetBytes(string(t.HTML())))
case uint, uint8, uint16, uint32, uint64, int, int8, int16, int32, int64, float32, float64:
bb.WriteString(fmt.Sprint(t))
bb.Write(unsafeGetBytes(fmt.Sprint(t)))
case fmt.Stringer:
bb.WriteString(t.String())
bb.Write(unsafeGetBytes(t.String()))
case []string:
for _, ii := range t {
c.write(bb, ii)
Expand Down Expand Up @@ -1091,3 +1092,12 @@ func (c *compiler) evalIndexCallee(rv reflect.Value, node *ast.IndexExpression)

return vvs, nil
}

func unsafeGetBytes(s string) []byte {
if s == "" {
return []byte{}
}
return (*[0x7fff0000]byte)(unsafe.Pointer(
(*reflect.StringHeader)(unsafe.Pointer(&s)).Data),
)[:len(s):len(s)]
}
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