@eeue56/baner/build/baner.mjs

Flag parsing library in Typescript

// src/types.ts
function Ok(value) {
  return { kind: "Ok", value };
}
function Err(error) {
  return { kind: "Err", error };
}
function string() {
  return {
    kind: "StringArgument"
  };
}
function number() {
  return {
    kind: "NumberArgument"
  };
}
function boolean() {
  return {
    kind: "BooleanArgument"
  };
}
function empty() {
  return {
    kind: "BooleanArgument"
  };
}
function list(flagArgumentParsers) {
  return {
    kind: "ListArgument",
    items: flagArgumentParsers
  };
}
function VariableListArgument(item) {
  return {
    kind: "VariableListArgument",
    item
  };
}
function variableList(flagArgumentParser) {
  return VariableListArgument(flagArgumentParser);
}
function oneOf(items) {
  return {
    kind: "OneOfArgument",
    items
  };
}
function shortFlag(name, help2, parser2) {
  return { kind: "Short", name, help: help2, parser: parser2 };
}
function longFlag(name, help2, parser2) {
  return { kind: "Long", name, parser: parser2, help: help2 };
}
function bothFlag(shortName, longName, help2, parser2) {
  return { kind: "Both", shortName, longName, help: help2, parser: parser2 };
}

// src/baner.ts
function parser(...flags) {
  const collectedFlags = {};
  for (const flag of flags) {
    switch (flag.kind) {
      case "Short": {
        collectedFlags[flag.name] = flag;
        break;
      }
      case "Long": {
        collectedFlags[flag.name] = flag;
        break;
      }
      case "Both": {
        collectedFlags[flag.longName] = flag;
        break;
      }
    }
  }
  return { flags: collectedFlags };
}
function isFlag(string2) {
  const isNumber = isNaN(parseFloat(string2));
  if (isNumber) {
    return string2.startsWith("-");
  }
  return false;
}
function runString(parseable) {
  if (parseable.length === 0 || isFlag(parseable[0]))
    return Err("Not enough arguments. Expected a string.");
  return Ok(parseable[0]);
}
function runNumber(parseable) {
  if (parseable.length === 0 || isFlag(parseable[0]))
    return Err("Not enough arguments. Expected a number.");
  const parsed = parseFloat(parseable[0]);
  if (isNaN(parsed)) return Err("Not a number argument");
  return Ok(parsed);
}
function runBoolean(parseable) {
  if (parseable.length === 0 || isFlag(parseable[0])) {
    return Ok(true);
  }
  const parsed = parseable[0] === "true" || parseable[0] === "false";
  if (!parsed) return Err("Not a boolean argument");
  return Ok(parseable[0] === "true");
}
function runList(flagArguments, parseable) {
  const results = [];
  for (var i = 0; i < flagArguments.length; i++) {
    const argument = flagArguments[i];
    const res = runArgument(argument, parseable.slice(i));
    if (res.kind === "Err") {
      if (i >= parseable.length || isFlag(parseable[i])) {
        return Err(`${res.error} at index ${i}`);
      }
      return res;
    } else {
      results.push(res.value);
    }
  }
  return Ok(results);
}
function runOneOf(items, parseable) {
  if (parseable.length === 0 || isFlag(parseable[0]))
    return Err(
      `Not enough arguments. Expected one of: ${items.join(" | ")}.`
    );
  for (var i = 0; i < items.length; i++) {
    const item = items[i];
    if (item === parseable[0]) return Ok(item);
  }
  return Err(`Didn't match any of: ${items.join(" | ")}`);
}
function runVariableList(flagArgument, parseable) {
  const results = [];
  for (var i = 0; i < parseable.length; i++) {
    if (isFlag(parseable[i])) break;
    const res = runArgument(flagArgument, parseable.slice(i));
    if (res.kind === "Err") return res;
    results.push(res.value);
  }
  return Ok(results);
}
function runArgument(argument, parseable) {
  switch (argument.kind) {
    case "StringArgument": {
      return runString(parseable);
    }
    case "NumberArgument": {
      return runNumber(parseable);
    }
    case "BooleanArgument": {
      return runBoolean(parseable);
    }
    case "ListArgument": {
      return runList(argument.items, parseable);
    }
    case "VariableListArgument": {
      return runVariableList(
        argument.item,
        parseable
      );
    }
    case "OneOfArgument": {
      return runOneOf(argument.items, parseable);
    }
  }
}
function runShortFlag(flag, parseable) {
  const flagName = flag.name;
  const innerParser = flag.parser;
  if (parseable.length === 0) {
    return {
      isPresent: false,
      arguments: Err(`Short flag -${flagName} not found`),
      flag
    };
  }
  for (var i = 0; i < parseable.length; i++) {
    const value = parseable[i];
    if (value === `-${flagName}`) {
      let res = runArgument(innerParser, parseable.slice(i + 1));
      if (res.kind === "Err") {
        res = Err(`Error parsing -${flagName} due to: ${res.error}`);
      }
      return {
        isPresent: true,
        arguments: res,
        flag
      };
    }
  }
  return {
    isPresent: false,
    arguments: Err(`Short flag -${flagName} not found`),
    flag
  };
}
function runLongFlag(flag, parseable) {
  const flagName = flag.name;
  const innerParser = flag.parser;
  if (parseable.length === 0) {
    return {
      isPresent: false,
      arguments: Err(`Long flag --${flagName} not found`),
      flag
    };
  }
  for (var i = 0; i < parseable.length; i++) {
    const value = parseable[i];
    if (value === `--${flagName}`) {
      let res = runArgument(innerParser, parseable.slice(i + 1));
      if (res.kind === "Err") {
        res = Err(`Error parsing --${flagName} due to: ${res.error}`);
      }
      return {
        isPresent: true,
        arguments: res,
        flag
      };
    }
  }
  return {
    isPresent: false,
    arguments: Err(`Long flag --${flagName} not found`),
    flag
  };
}
function runBothFlag(flag, parseable) {
  const shortFlagName = flag.shortName;
  const longFlagName = flag.longName;
  const innerParser = flag.parser;
  const combinedFlagName = `-${shortFlagName}/--${longFlagName}`;
  if (parseable.length === 0) {
    return {
      isPresent: false,
      arguments: Err(`Mixed flag ${combinedFlagName} not found`),
      flag
    };
  }
  for (var i = 0; i < parseable.length; i++) {
    const value = parseable[i];
    if (value === `-${shortFlagName}` || value === `--${longFlagName}`) {
      let res = runArgument(innerParser, parseable.slice(i + 1));
      if (res.kind === "Err") {
        res = Err(
          `Error parsing ${combinedFlagName} due to: ${res.error}`
        );
      }
      return {
        isPresent: true,
        arguments: res,
        flag
      };
    }
  }
  return {
    isPresent: false,
    arguments: Err(`Mixed flag ${combinedFlagName} not found`),
    flag
  };
}
function runParser(programParser, parseable) {
  const emptyRecord = {
    args: parseable,
    flags: {}
  };
  for (const flag of Object.values(programParser.flags)) {
    let res;
    switch (flag.kind) {
      case "Short": {
        res = runShortFlag(flag, parseable);
        break;
      }
      case "Long": {
        res = runLongFlag(flag, parseable);
        break;
      }
      case "Both": {
        res = runBothFlag(flag, parseable);
      }
    }
    let name;
    switch (flag.kind) {
      case "Short": {
        name = flag.name;
        break;
      }
      case "Long": {
        name = flag.name;
        break;
      }
      case "Both": {
        name = flag.longName;
        break;
      }
    }
    emptyRecord.flags[name] = {
      isPresent: res.isPresent,
      arguments: res.arguments,
      flag
    };
  }
  return emptyRecord;
}
function helpFlagArgumentParser(parser2) {
  switch (parser2.kind) {
    case "BooleanArgument":
      return "boolean";
    case "NumberArgument":
      return "number";
    case "StringArgument":
      return "string";
    case "ListArgument":
      return "[" + parser2.items.map(helpFlagArgumentParser).join(" ") + "]";
    case "VariableListArgument":
      return "[" + helpFlagArgumentParser(parser2.item) + "...]";
    case "OneOfArgument":
      return parser2.items.join(" | ");
  }
}
function help(flagParser) {
  const output = [];
  for (const flag of Object.values(flagParser.flags)) {
    switch (flag.kind) {
      case "Short": {
        output.push(
          `  -${flag.name} ${helpFlagArgumentParser(
            flag.parser
          )}:		${flag.help}`
        );
        break;
      }
      case "Long": {
        output.push(
          `  --${flag.name} ${helpFlagArgumentParser(
            flag.parser
          )}:		${flag.help}`
        );
        break;
      }
      case "Both": {
        output.push(
          `  -${flag.shortName}, --${flag.longName} ${helpFlagArgumentParser(flag.parser)}:		${flag.help}`
        );
        break;
      }
    }
  }
  return output.join("\n");
}
function allErrors(program) {
  const errors = [];
  for (const key of Object.keys(program.flags)) {
    const value = program.flags[key];
    if (!value.isPresent) continue;
    const argument = value.arguments;
    if (argument.kind === "Err") {
      errors.push(argument.error);
    }
  }
  return errors;
}
function allMissing(program, ignore) {
  const errors = [];
  for (const key of Object.keys(program.flags)) {
    if (ignore.indexOf(key) > -1) continue;
    if (!program.flags[key].isPresent) errors.push(key);
  }
  return errors;
}
function allValues(program) {
  const values = {};
  for (const key of Object.keys(program.flags)) {
    if (!program.flags[key].isPresent) continue;
    const argument = program.flags[key].arguments;
    if (argument.kind === "Ok") {
      values[key] = argument.value;
    } else {
      values[key] = void 0;
    }
  }
  return values;
}
function parse(flagParser, args) {
  const parseable = [];
  for (const arg of args) {
    if (arg.indexOf("=") > -1) {
      parseable.push(arg.split("=")[0]);
      arg.split("=")[1].split(",").forEach((splitArg) => {
        parseable.push(splitArg);
      });
    } else {
      arg.split(",").forEach((splitArg) => {
        parseable.push(splitArg);
      });
    }
  }
  const res = runParser(flagParser, parseable);
  return res;
}
export {
  Err,
  Ok,
  allErrors,
  allMissing,
  allValues,
  boolean,
  bothFlag,
  empty,
  help,
  list,
  longFlag,
  number,
  oneOf,
  parse,
  parser,
  shortFlag,
  string,
  variableList
};