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package main
import (
"fmt"
"os"
"strings"
"github.com/holiman/uint256"
)
func Assemble(code string) []byte {
bytecode := make([]byte, 0)
t := strings.Fields(code)
push := byte(0)
for i := range t {
x, found := OpcodeStrings[t[i]]
if found {
push = (&x).IsPush()
fmt.Printf("token: %s, opcode: 0x%x, push = %d\n", t[i], int(x), int(push))
bytecode = append(bytecode, byte(x))
} else {
if push == 0 {
fmt.Fprintf(os.Stderr, "unexpected token: %s\n", t[i])
os.Exit(1)
}
var n *uint256.Int = nil
if len(t[i]) > 1 && t[i][1] == 'x' {
n, _ = uint256.FromHex(t[i])
} else {
n, _ = uint256.FromDecimal(t[i])
}
if (t[i] == "PUSH") {
push = byte(n.ByteLen())
}
b := n.Bytes32()
fmt.Printf("token: NUMBER, value: %s, push = %d\n", t[i], int(push), b[32 - push:])
bytecode = append(bytecode, b[32-push:]...)
}
}
return bytecode
}
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