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import {
Book,
DestinationAllocationPolicy,
Metric,
SourceAllocationPolicy,
SourceConstraint,
Tr8AST,
Tx,
TxDestination,
TxSource,
} from "../domain/ast.js";
import { fastHash } from "../domain/utils/hasher.js";
import { decimalStringToAmount } from "../domain/utils/math-low-level.js";
import { AbsoluteFixedValue, Amount, RelativeValue } from "../domain/value.js";
import {
absRefValueRegex,
destRegex,
metricsRegex,
num,
relRefValueRegex,
sourceRegex,
} from "./regex.js";
import { scriptParser, Tr8Script } from "./tr8Script.js";
interface Tr8ScriptParser {
parse(script: string): Tr8AST;
}
class HashRegexParser {
readonly #hash: number;
constructor(hash: number) {
this.#hash = hash;
}
parse(script: Tr8Script): Tr8AST {
const { type, callbackUrl, id, txs, metrics, metadata } = script;
return {
id,
type,
metadata,
callbackUrl,
metrics: metrics.map((x) => this.parseMetric(x)),
txs: txs.map((x) => {
const r: Tx = {
asset: x.asset,
sources: x.sources.map((s) => this.parseSource(s)),
destinations: x.destinations.map((d) => this.parseDestination(d)),
refValue: this.parseReferenceValue(x.ref, x.use),
};
if (x.use) r.use = x.use;
return r;
}),
} satisfies Tr8AST;
}
parseReferenceValue(
s: string,
use?: string,
): AbsoluteFixedValue | RelativeValue {
// if mark, must be absolute, but use reference value
if (use) {
if (!absRefValueRegex.test(s))
throw new Error(
"Invalid reference value, use reference value must be absolute",
);
const book = "abs";
const account = s;
const fraction = "1/1";
return {
type: "relative",
amount: this.parseValue(fraction) as [Amount, Amount],
book: this.parseBook(book),
account,
};
} else if (absRefValueRegex.test(s)) {
const a = decimalStringToAmount(s);
// ensure 4 scale, always
if (a.scale < 4) {
const diff = 4n - a.scale;
return {
type: "absolute",
amount: {
amount: a.amount * 10n ** diff,
scale: 4n,
},
};
}
return {
type: "absolute",
amount: a,
};
} else if (relRefValueRegex.test(s)) {
const m = relRefValueRegex.exec(s)!.slice();
const book = m[5]!.trim();
const account = m[6]!.trim();
const fraction = m[1]!.trim();
return {
type: "relative",
amount: this.parseValue(fraction) as [Amount, Amount],
book: this.parseBook(book),
account,
};
} else {
throw new Error("Invalid reference value");
}
}
parseValue(val: string): Amount | [Amount, Amount] {
const perc = new RegExp(`^${num}%$`);
const frac = new RegExp(`^${num}/${num}$`);
if (perc.test(val)) {
const v = decimalStringToAmount(val.split("%")[0] ?? "0");
return [
{
amount: v.amount,
scale: v.scale + 2n,
},
{
amount: BigInt(100),
scale: 2n,
},
];
} else if (frac.test(val)) {
const [numerator, denominator] = val.split("/");
return [
decimalStringToAmount(numerator ?? "0"),
decimalStringToAmount(denominator ?? "0"),
];
} else {
return decimalStringToAmount(val);
}
}
parseSourceAllocationPolicy(s: string): SourceAllocationPolicy {
if (s === "remaining") return { policy: "remaining" };
if (s.includes("max")) {
const [, amt] = s.split(" ");
return {
policy: "max",
amount: this.parseValue(amt ?? "0"),
};
}
return {
policy: "split",
amount: this.parseValue(s),
};
}
parseDestinationAllocationPolicy(s: string): DestinationAllocationPolicy {
if (s === "remaining") return { policy: "remaining" };
return {
policy: "split",
amount: this.parseValue(s),
};
}
parseConstraints(s: string, book: Book, account: string): SourceConstraint[] {
const constraints = s
.split(",")
.map((x) => x.trim())
.filter((x) => x.length > 0);
return constraints.map((c) => {
const [constraint, quantifier] = c.split(" ").map((x) => x.trim());
if (quantifier === "unbounded") {
return {
constraint: constraint as "overdraft" | "limit" | "keep",
amount: "unbounded",
} satisfies SourceConstraint;
}
const amount = this.parseValue(quantifier ?? "0");
if (Array.isArray(amount)) {
// fractional
return {
constraint: constraint as "overdraft" | "limit" | "keep",
amount: {
type: "relative",
amount: amount,
account,
book,
} as AbsoluteFixedValue | RelativeValue,
} satisfies SourceConstraint;
} else {
// absolute
return {
constraint: constraint as "overdraft" | "limit" | "keep",
amount: {
type: "absolute",
amount: amount,
} as AbsoluteFixedValue | RelativeValue,
} satisfies SourceConstraint;
}
});
}
parseModifiers(s: string): { mark?: string; as?: string } {
const tokens = s
.split(" ")
.map((x) => x.trim())
.filter((x) => x.length > 0);
let count = 0;
const ret: { mark?: string; as?: string } = {};
while (count < tokens.length) {
const curr = tokens[count];
if (curr === "as") ret.as = tokens[count + 1];
if (curr === "mark") ret.mark = tokens[count + 1];
count += 2;
}
return ret;
}
parseBook(s: string): Book {
if (s.startsWith("#")) {
// world sharding
const prefix = s.slice(1);
return {
book: `${prefix}#${this.#hash}`,
type: "world",
};
} else {
return {
book: s,
type: "normal",
};
}
}
parseSource(s: string): TxSource {
const m = sourceRegex.exec(s)?.slice() ?? [];
const allocation = m[1]?.trim() ?? "";
const constraints = m[9]?.trim() ?? "";
const extern = m[25] === "ext";
const b = m[26]?.trim() ?? "";
const account = m[27]?.trim() ?? "";
const modifiers = m[28]?.trim() ?? "";
const mod = this.parseModifiers(modifiers);
// parse book
const book = this.parseBook(b);
const ret: TxSource = {
account,
book,
extern,
allocationPolicy: this.parseSourceAllocationPolicy(allocation),
constraints: this.parseConstraints(constraints, book, account),
};
if (mod.as) ret.as = mod.as;
if (mod.mark) ret.mark = mod.mark;
return ret;
}
parseDestination(s: string): TxDestination {
const m = destRegex.exec(s)?.slice() ?? [];
const allocation = m[1]?.trim() ?? "";
const book = m[6]?.trim() ?? "";
const account = m[7]?.trim() ?? "";
const modifiers = m[8]?.trim() ?? "";
const mods = this.parseModifiers(modifiers);
const ret: TxDestination = {
account,
book: this.parseBook(book),
allocationPolicy: this.parseDestinationAllocationPolicy(allocation),
};
if (mods.as) ret.as = mods.as;
if (mods.mark) ret.mark = mods.mark;
return ret;
}
parseMetric(s: string): Metric {
const [, book = "", account = "", ops = "", args = ""] =
metricsRegex.exec(s)?.slice() ?? [];
return {
book: this.parseBook(book),
account,
op: ops as "add" | "sub" | "replace",
args: args
.split(" ")
.map((x) => x.trim())
.filter((x) => x.length > 0),
};
}
}
class RegexTr8ScriptParser implements Tr8ScriptParser {
readonly #partitions: number;
constructor(partitions: number = 1) {
this.#partitions = partitions;
}
parse(s: string): Tr8AST {
const u: unknown = parse(s);
const ts = scriptParser.parse(u) as Tr8Script;
const hash = fastHash(ts.id, this.#partitions);
const parser = new HashRegexParser(hash);
return parser.parse(ts);
}
}
export { RegexTr8ScriptParser, HashRegexParser };
export type { Tr8ScriptParser };
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