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import * as ast from "../ast/index.ts";import { stringifyFullIdent } from "./stringify-ast-frag.ts";
export function evalConstant(  constant: ast.Constant,): boolean | number | string {  switch (constant.type) {    case "aggregate":      return "";    case "bool-lit":      return evalBoolLit(constant.text);    case "full-ident":      return stringifyFullIdent(constant);    case "signed-float-lit":      return evalSignedFloatLit(constant);    case "signed-int-lit":      return evalSignedIntLit(constant);    case "str-lit":      return evalStrLit(constant);  }}
export function evalBoolLit(text: string): boolean {  if (text === "true") return true;  return false;}
export function evalIntLit(intLit: ast.IntLit): number {  const text = intLit.text;  if (text.startsWith("0x")) return parseInt(text, 16);  if (text.startsWith("0")) return parseInt(text, 8);  return parseInt(text, 10);}
export function evalSignedIntLit(signedIntLit: ast.SignedIntLit): number {  const intLit = signedIntLit.value;  if (signedIntLit.sign?.text === "-") return -evalIntLit(intLit);  return evalIntLit(intLit);}
export function evalFloatLit(floatLit: ast.FloatLit): number {  const text = floatLit.text;  if (text === "inf") return Infinity;  if (text === "nan") return NaN;  return parseFloat(text);}
export function evalSignedFloatLit(signedFloatLit: ast.SignedFloatLit): number {  const floatLit = signedFloatLit.value;  if (signedFloatLit.sign?.text === "-") return -evalFloatLit(floatLit);  return evalFloatLit(floatLit);}
export function evalStrLit(strLit: ast.StrLit): string {  return strLit.tokens.map((token) => evalStrLitFragment(token.text)).join("");}
function evalStrLitFragment(text: string): string {  return text    .slice(1, -1)    .replace(      /(?:\\x([0-9a-f]{2})|\\([0-7]{3})|\\([0abfnrtv\\'"]))/i,      (input, hex, octal, char: string) => {        if (hex) return String.fromCodePoint(parseInt(hex, 16));        if (octal) return String.fromCharCode(parseInt(octal, 8) % 0x100);        if (char) return charMap[char.toLowerCase() as keyof typeof charMap];        return input;      },    );}
const charMap = {  "0": "\x00",  "a": "\x07",  "b": "\x08",  "f": "\x0C",  "n": "\x0A",  "r": "\x0D",  "t": "\x09",  "v": "\x0B",  "\\": "\x5C",  "'": "\x27",  '"': "\x22",};