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package code
import (
"encoding/binary"
"math"
)
type Builder struct {
code []byte
debugInfo DebugInfo
currentLine int
lineStart int
}
func NewBuilder() Builder {
return Builder{
code: make([]byte, 0, 64),
debugInfo: NewDebugInfo("unknown file"),
lineStart: -1,
currentLine: -1,
}
}
func (b *Builder) AppendOp(op Op) {
b.code = append(b.code, byte(op))
}
func (b *Builder) AppendInt(x int64) {
b.code = append(b.code, make([]byte, 8)...)
binary.LittleEndian.PutUint64(b.code[len(b.code)-8:], uint64(x))
}
func (b *Builder) AppendFloat(x float64) {
b.AppendInt(int64(math.Float64bits(x)))
}
func (b *Builder) AppendString(s string) {
b.code = append(b.code, []byte(s)...)
b.code = append(b.code, 0)
}
func (b *Builder) AppendRaw(raw Raw) {
b.code = append(b.code, raw...)
}
func (b *Builder) StartLine(line int) {
if b.lineStart != -1 {
panic("line already started")
}
b.currentLine = line
b.lineStart = len(b.code)
}
func (b *Builder) EndLine() {
defer func() {
b.currentLine = -1
b.lineStart = -1
}()
if b.lineStart == -1 {
panic("line not started")
}
if b.lineStart == len(b.code) {
return
}
b.debugInfo.AppendLine(len(b.code)-1, b.currentLine)
}
func (b *Builder) SetInt(at int, x int64) {
binary.LittleEndian.PutUint64(b.code[at:], uint64(x))
}
func (b *Builder) Code() Raw {
return Raw(b.code)
}
func (b *Builder) Len() int {
return len(b.code)
}
func (b *Builder) Build() Code {
return New(b.code, b.debugInfo)
}
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