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builder.go
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builder.go
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package compiler
import (
"fmt"
"strconv"
"strings"
)
type builder struct {
items []*builderItem
pendingVerify *builderItem
}
type builderItem struct {
opcodes string
stk stack
}
func (b *builder) add(opcodes string, newstack stack) stack {
if b.pendingVerify != nil {
b.items = append(b.items, b.pendingVerify)
b.pendingVerify = nil
}
item := &builderItem{opcodes: opcodes, stk: newstack}
if opcodes == "VERIFY" {
b.pendingVerify = item
} else {
b.items = append(b.items, item)
}
return newstack
}
func (b *builder) addRoll(stk stack, n int) stack {
b.addInt64(stk, int64(n))
return b.add("ROLL", stk.roll(n))
}
func (b *builder) addDup(stk stack) stack {
return b.add("DUP", stk.dup())
}
func (b *builder) addInt64(stk stack, n int64) stack {
s := strconv.FormatInt(n, 10)
return b.add(s, stk.add(s))
}
func (b *builder) addNot(stk stack, desc string) stack {
return b.add("NOT", stk.drop().add(desc))
}
func (b *builder) addEqual(stk stack, desc string) stack {
return b.add("EQUAL", stk.dropN(2).add(desc))
}
func (b *builder) addNumEqual(stk stack, desc string) stack {
return b.add("NUMEQUAL", stk.dropN(2).add(desc))
}
func (b *builder) addJumpIf(stk stack, label string) stack {
return b.add(fmt.Sprintf("JUMPIF:$%s", label), stk.drop())
}
func (b *builder) addJumpTarget(stk stack, label string) stack {
return b.add("$"+label, stk)
}
func (b *builder) addDrop(stk stack) stack {
return b.add("DROP", stk.drop())
}
func (b *builder) forgetPendingVerify() {
b.pendingVerify = nil
}
func (b *builder) addJump(stk stack, label string) stack {
return b.add(fmt.Sprintf("JUMP:$%s", label), stk)
}
func (b *builder) addVerify(stk stack) stack {
return b.add("VERIFY", stk.drop())
}
func (b *builder) addData(stk stack, data []byte) stack {
var s string
switch len(data) {
case 0:
s = "0"
case 1:
s = strconv.FormatInt(int64(data[0]), 10)
default:
s = fmt.Sprintf("0x%x", data)
}
return b.add(s, stk.add(s))
}
func (b *builder) addAmount(stk stack, desc string) stack {
return b.add("AMOUNT", stk.add(desc))
}
func (b *builder) addAsset(stk stack, desc string) stack {
return b.add("ASSET", stk.add(desc))
}
func (b *builder) addCheckOutput(stk stack, desc string) stack {
return b.add("CHECKOUTPUT", stk.dropN(5).add(desc))
}
func (b *builder) addBoolean(stk stack, val bool) stack {
if val {
return b.add("TRUE", stk.add("true"))
}
return b.add("FALSE", stk.add("false"))
}
func (b *builder) addOps(stk stack, ops string, desc string) stack {
return b.add(ops, stk.add(desc))
}
func (b *builder) addToAltStack(stk stack) (stack, string) {
t := stk.top()
return b.add("TOALTSTACK", stk.drop()), t
}
func (b *builder) addTxSigHash(stk stack) stack {
return b.add("TXSIGHASH", stk.add("<txsighash>"))
}
func (b *builder) addFromAltStack(stk stack, alt string) stack {
return b.add("FROMALTSTACK", stk.add(alt))
}
func (b *builder) addSwap(stk stack) stack {
return b.add("SWAP", stk.swap())
}
func (b *builder) addCheckMultisig(stk stack, n int, desc string) stack {
return b.add("CHECKMULTISIG", stk.dropN(n).add(desc))
}
func (b *builder) addOver(stk stack) stack {
return b.add("OVER", stk.over())
}
func (b *builder) addPick(stk stack, n int) stack {
b.addInt64(stk, int64(n))
return b.add("PICK", stk.pick(n))
}
func (b *builder) addCatPushdata(stk stack, desc string) stack {
return b.add("CATPUSHDATA", stk.dropN(2).add(desc))
}
func (b *builder) addCat(stk stack, desc string) stack {
return b.add("CAT", stk.dropN(2).add(desc))
}
func (b *builder) addNop(stk stack) stack {
return b.add("NOP", stk)
}
func (b *builder) opcodes() string {
var ops []string
for _, item := range b.items {
ops = append(ops, item.opcodes)
}
return strings.Join(ops, " ")
}
// This is for producing listings like:
// 5 | [... <clause selector> borrower lender deadline balanceAmount balanceAsset 5]
// ROLL | [... borrower lender deadline balanceAmount balanceAsset <clause selector>]
// JUMPIF:$default | [... borrower lender deadline balanceAmount balanceAsset]
// $repay | [... borrower lender deadline balanceAmount balanceAsset]
// 0 | [... borrower lender deadline balanceAmount balanceAsset 0]
// 0 | [... borrower lender deadline balanceAmount balanceAsset 0 0]
// 3 | [... borrower lender deadline balanceAmount balanceAsset 0 0 3]
// ROLL | [... borrower lender deadline balanceAsset 0 0 balanceAmount]
// 3 | [... borrower lender deadline balanceAsset 0 0 balanceAmount 3]
// ROLL | [... borrower lender deadline 0 0 balanceAmount balanceAsset]
// 1 | [... borrower lender deadline 0 0 balanceAmount balanceAsset 1]
// 6 | [... borrower lender deadline 0 0 balanceAmount balanceAsset 1 6]
// ROLL | [... borrower deadline 0 0 balanceAmount balanceAsset 1 lender]
// CHECKOUTPUT | [... borrower deadline checkOutput(payment, lender)]
// VERIFY | [... borrower deadline]
// 1 | [... borrower deadline 1]
// 0 | [... borrower deadline 1 0]
// AMOUNT | [... borrower deadline 1 0 <amount>]
// ASSET | [... borrower deadline 1 0 <amount> <asset>]
// 1 | [... borrower deadline 1 0 <amount> <asset> 1]
// 6 | [... borrower deadline 1 0 <amount> <asset> 1 6]
// ROLL | [... deadline 1 0 <amount> <asset> 1 borrower]
// CHECKOUTPUT | [... deadline checkOutput(collateral, borrower)]
// JUMP:$_end | [... borrower lender deadline balanceAmount balanceAsset]
// $default | [... borrower lender deadline balanceAmount balanceAsset]
// 2 | [... borrower lender deadline balanceAmount balanceAsset 2]
// ROLL | [... borrower lender balanceAmount balanceAsset deadline]
// MINTIME LESSTHAN | [... borrower lender balanceAmount balanceAsset after(deadline)]
// VERIFY | [... borrower lender balanceAmount balanceAsset]
// 0 | [... borrower lender balanceAmount balanceAsset 0]
// 0 | [... borrower lender balanceAmount balanceAsset 0 0]
// AMOUNT | [... borrower lender balanceAmount balanceAsset 0 0 <amount>]
// ASSET | [... borrower lender balanceAmount balanceAsset 0 0 <amount> <asset>]
// 1 | [... borrower lender balanceAmount balanceAsset 0 0 <amount> <asset> 1]
// 7 | [... borrower lender balanceAmount balanceAsset 0 0 <amount> <asset> 1 7]
// ROLL | [... borrower balanceAmount balanceAsset 0 0 <amount> <asset> 1 lender]
// CHECKOUTPUT | [... borrower balanceAmount balanceAsset checkOutput(collateral, lender)]
// $_end | [... borrower lender deadline balanceAmount balanceAsset]
type (
Step struct {
Opcodes string `json:"opcodes"`
Stack string `json:"stack"`
}
)
func (b *builder) steps() []Step {
var result []Step
for _, item := range b.items {
result = append(result, Step{item.opcodes, item.stk.String()})
}
return result
}