Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 836 insertions, 0 deletions

diff --git a/devtools/server/actors/webconsole/commands/manager.js b/devtools/server/actors/webconsole/commands/manager.js
new file mode 100644
index 0000000000..3fa274a0f5
--- /dev/null
+++ b/devtools/server/actors/webconsole/commands/manager.js
@@ -0,0 +1,577 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+loader.lazyRequireGetter(
+  this,
+  ["isCommand"],
+  "resource://devtools/server/actors/webconsole/commands/parser.js",
+  true
+);
+
+/**
+ * WebConsole commands manager.
+ *
+ * Defines a set of functions / variables ("commands") that are available from
+ * the Web Console but not from the web page.
+ *
+ */
+const WebConsoleCommandsManager = {
+  _registeredCommands: new Map(),
+
+  /**
+   * Register a new command.
+   * @param {string} name The command name (exemple: "$")
+   * @param {(function|object)} command The command to register.
+   *  It can be a function so the command is a function (like "$()"),
+   *  or it can also be a property descriptor to describe a getter(like
+   *  "$0").
+   *
+   *  The command function or the command getter are passed a owner object as
+   *  their first parameter (see the example below).
+   *
+   * @example
+   *
+   *   WebConsoleCommandsManager.register("$", function JSTH_$(owner, selector)
+   *   {
+   *     return owner.window.document.querySelector(selector);
+   *   });
+   *
+   *   WebConsoleCommandsManager.register("$0", {
+   *     get: function(owner) {
+   *       return owner.makeDebuggeeValue(owner.selectedNode);
+   *     }
+   *   });
+   */
+  register(name, command) {
+    if (
+      typeof command != "function" &&
+      !(typeof command == "object" && typeof command.get == "function")
+    ) {
+      throw new Error(
+        "Invalid web console command. It can only be a function, or an object with a function as 'get' attribute"
+      );
+    }
+    this._registeredCommands.set(name, command);
+  },
+
+  /**
+   * Return the name of all registered commands.
+   *
+   * @return {array} List of all command names.
+   */
+  getAllCommandNames() {
+    return [...this._registeredCommands.keys()];
+  },
+
+  /**
+   * There is two types of "commands" here.
+   *
+   * - Functions or variables exposed in the scope of the evaluated string from the WebConsole input.
+   *   Example: $(), $0, copy(), clear(),...
+   * - "True commands", which can also be ran from the WebConsole input with ":" prefix.
+   *   Example: this list of commands.
+   *   Note that some "true commands" are not exposed as function (see getColonOnlyCommandNames).
+   *
+   * The following list distinguish these "true commands" from the first category.
+   * It especially avoid any JavaScript evaluation when the frontend tries to execute
+   * a string starting with ':' character.
+   */
+  getAllColonCommandNames() {
+    return ["block", "help", "history", "screenshot", "unblock"];
+  },
+
+  /**
+   * Some commands are not exposed in the scope of the evaluated string,
+   * and can only be used via `:command-name`.
+   */
+  getColonOnlyCommandNames() {
+    return ["screenshot"];
+  },
+
+  /**
+   * Map of all command objects keyed by command name.
+   * Commands object are the objects passed to register() method.
+   *
+   * @return {Map<string -> command>}
+   */
+  getAllCommands() {
+    return this._registeredCommands;
+  },
+
+  /**
+   * Is the command name possibly overriding a symbol which
+   * already exists in the paused frame, or global into which
+   * we are about to execute into?
+   */
+  _isCommandNameAlreadyInScope(name, frame, dbgGlobal) {
+    // Fallback on global scope when Debugger.Frame doesn't come along an Environment.
+    if (frame && frame.environment) {
+      return !!frame.environment.find(name);
+    }
+    return !!dbgGlobal.getOwnPropertyDescriptor(name);
+  },
+
+  /**
+   * Create an object with the API we expose to the Web Console during
+   * JavaScript evaluation.
+   * This object inherits properties and methods from the Web Console actor.
+   *
+   * @param object consoleActor
+   *        The related web console actor evaluating some code.
+   * @param object debuggerGlobal
+   *        A Debugger.Object that wraps a content global. This is used for the
+   *        Web Console Commands.
+   * @param object frame (optional)
+   *        The frame where the string was evaluated.
+   * @param string evalInput
+   *        String to evaluate.
+   * @param string selectedNodeActorID
+   *        The Node actor ID of the currently selected DOM Element, if any is selected.
+   *
+   * @return object
+   *         Object with two properties:
+   *         - 'bindings', the object with all commands set as attribute on this object.
+   *         - 'getHelperResult', a live getter returning the additional data the last command
+   *           which executed want to convey to the frontend.
+   *           (The return value of commands isn't returned to the client but it only
+   *            returned to the code ran from console evaluation)
+   */
+  getWebConsoleCommands(
+    consoleActor,
+    debuggerGlobal,
+    frame,
+    evalInput,
+    selectedNodeActorID
+  ) {
+    const bindings = Object.create(null);
+
+    const owner = {
+      window: consoleActor.evalGlobal,
+      makeDebuggeeValue: debuggerGlobal.makeDebuggeeValue.bind(debuggerGlobal),
+      createValueGrip: consoleActor.createValueGrip.bind(consoleActor),
+      preprocessDebuggerObject:
+        consoleActor.preprocessDebuggerObject.bind(consoleActor),
+      helperResult: null,
+      consoleActor,
+      evalInput,
+    };
+    if (selectedNodeActorID) {
+      const actor = consoleActor.conn.getActor(selectedNodeActorID);
+      if (actor) {
+        owner.selectedNode = actor.rawNode;
+      }
+    }
+
+    const evalGlobal = consoleActor.evalGlobal;
+    function maybeExport(obj, name) {
+      if (typeof obj[name] != "function") {
+        return;
+      }
+
+      // By default, chrome-implemented functions that are exposed to content
+      // refuse to accept arguments that are cross-origin for the caller. This
+      // is generally the safe thing, but causes problems for certain console
+      // helpers like cd(), where we users sometimes want to pass a cross-origin
+      // window. To circumvent this restriction, we use exportFunction along
+      // with a special option designed for this purpose. See bug 1051224.
+      obj[name] = Cu.exportFunction(obj[name], evalGlobal, {
+        allowCrossOriginArguments: true,
+      });
+    }
+
+    // Not supporting extra commands in workers yet.  This should be possible to
+    // add one by one as long as they don't require jsm, Cu, etc.
+    const commands = isWorker ? [] : this.getAllCommands();
+
+    // Is it a command evaluation, starting with ':' prefix?
+    const isCmd = isCommand(evalInput);
+
+    const colonOnlyCommandNames = this.getColonOnlyCommandNames();
+    for (const [name, command] of commands) {
+      // When we are running command via `:` prefix, no user code is being ran and only the command executes,
+      // so always expose the commands as the command will try to call its JavaScript method (see getEvalInput).
+      // Otherwise, when we run user code, we want to avoid overriding existing symbols with commands.
+      // Also ignore commands which can only be run with the `:` prefix.
+      if (
+        !isCmd &&
+        (this._isCommandNameAlreadyInScope(name, frame, debuggerGlobal) ||
+          colonOnlyCommandNames.includes(name))
+      ) {
+        continue;
+      }
+
+      const descriptor = {
+        // We force the enumerability and the configurability (so the
+        // WebConsoleActor can reconfigure the property).
+        enumerable: true,
+        configurable: true,
+      };
+
+      if (typeof command === "function") {
+        // Function commands
+        descriptor.value = command.bind(undefined, owner);
+        maybeExport(descriptor, "value");
+        // Make sure the helpers can be used during eval.
+        descriptor.value = debuggerGlobal.makeDebuggeeValue(descriptor.value);
+      } else if (typeof command?.get === "function") {
+        // Getter commands
+        descriptor.get = command.get.bind(undefined, owner);
+        maybeExport(descriptor, "get");
+      }
+      Object.defineProperty(bindings, name, descriptor);
+    }
+
+    return {
+      // Use a method as commands will update owner.helperResult later
+      getHelperResult() {
+        return owner.helperResult;
+      },
+      bindings,
+    };
+  },
+};
+
+exports.WebConsoleCommandsManager = WebConsoleCommandsManager;
+
+/*
+ * Built-in commands.
+ *
+ * A list of helper functions used by Firebug can be found here:
+ *   http://getfirebug.com/wiki/index.php/Command_Line_API
+ */
+
+/**
+ * Find a node by ID.
+ *
+ * @param string id
+ *        The ID of the element you want.
+ * @return Node or null
+ *         The result of calling document.querySelector(selector).
+ */
+WebConsoleCommandsManager.register("$", function (owner, selector) {
+  try {
+    return owner.window.document.querySelector(selector);
+  } catch (err) {
+    // Throw an error like `err` but that belongs to `owner.window`.
+    throw new owner.window.DOMException(err.message, err.name);
+  }
+});
+
+/**
+ * Find the nodes matching a CSS selector.
+ *
+ * @param string selector
+ *        A string that is passed to window.document.querySelectorAll.
+ * @return NodeList
+ *         Returns the result of document.querySelectorAll(selector).
+ */
+WebConsoleCommandsManager.register("$$", function (owner, selector) {
+  let nodes;
+  try {
+    nodes = owner.window.document.querySelectorAll(selector);
+  } catch (err) {
+    // Throw an error like `err` but that belongs to `owner.window`.
+    throw new owner.window.DOMException(err.message, err.name);
+  }
+
+  // Calling owner.window.Array.from() doesn't work without accessing the
+  // wrappedJSObject, so just loop through the results instead.
+  const result = new owner.window.Array();
+  for (let i = 0; i < nodes.length; i++) {
+    result.push(nodes[i]);
+  }
+  return result;
+});
+
+/**
+ * Returns the result of the last console input evaluation
+ *
+ * @return object|undefined
+ * Returns last console evaluation or undefined
+ */
+WebConsoleCommandsManager.register("$_", {
+  get(owner) {
+    return owner.consoleActor.getLastConsoleInputEvaluation();
+  },
+});
+
+/**
+ * Runs an xPath query and returns all matched nodes.
+ *
+ * @param string xPath
+ *        xPath search query to execute.
+ * @param [optional] Node context
+ *        Context to run the xPath query on. Uses window.document if not set.
+ * @param [optional] string|number resultType
+          Specify the result type. Default value XPathResult.ANY_TYPE
+ * @return array of Node
+ */
+WebConsoleCommandsManager.register(
+  "$x",
+  function (
+    owner,
+    xPath,
+    context,
+    resultType = owner.window.XPathResult.ANY_TYPE
+  ) {
+    const nodes = new owner.window.Array();
+    // Not waiving Xrays, since we want the original Document.evaluate function,
+    // instead of anything that's been redefined.
+    const doc = owner.window.document;
+    context = context || doc;
+    switch (resultType) {
+      case "number":
+        resultType = owner.window.XPathResult.NUMBER_TYPE;
+        break;
+
+      case "string":
+        resultType = owner.window.XPathResult.STRING_TYPE;
+        break;
+
+      case "bool":
+        resultType = owner.window.XPathResult.BOOLEAN_TYPE;
+        break;
+
+      case "node":
+        resultType = owner.window.XPathResult.FIRST_ORDERED_NODE_TYPE;
+        break;
+
+      case "nodes":
+        resultType = owner.window.XPathResult.UNORDERED_NODE_ITERATOR_TYPE;
+        break;
+    }
+    const results = doc.evaluate(xPath, context, null, resultType, null);
+    if (results.resultType === owner.window.XPathResult.NUMBER_TYPE) {
+      return results.numberValue;
+    }
+    if (results.resultType === owner.window.XPathResult.STRING_TYPE) {
+      return results.stringValue;
+    }
+    if (results.resultType === owner.window.XPathResult.BOOLEAN_TYPE) {
+      return results.booleanValue;
+    }
+    if (
+      results.resultType === owner.window.XPathResult.ANY_UNORDERED_NODE_TYPE ||
+      results.resultType === owner.window.XPathResult.FIRST_ORDERED_NODE_TYPE
+    ) {
+      return results.singleNodeValue;
+    }
+    if (
+      results.resultType ===
+        owner.window.XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE ||
+      results.resultType === owner.window.XPathResult.ORDERED_NODE_SNAPSHOT_TYPE
+    ) {
+      for (let i = 0; i < results.snapshotLength; i++) {
+        nodes.push(results.snapshotItem(i));
+      }
+      return nodes;
+    }
+
+    let node;
+    while ((node = results.iterateNext())) {
+      nodes.push(node);
+    }
+
+    return nodes;
+  }
+);
+
+/**
+ * Returns the currently selected object in the highlighter.
+ *
+ * @return Object representing the current selection in the
+ *         Inspector, or null if no selection exists.
+ */
+WebConsoleCommandsManager.register("$0", {
+  get(owner) {
+    return owner.makeDebuggeeValue(owner.selectedNode);
+  },
+});
+
+/**
+ * Clears the output of the WebConsole.
+ */
+WebConsoleCommandsManager.register("clear", function (owner) {
+  owner.helperResult = {
+    type: "clearOutput",
+  };
+});
+
+/**
+ * Clears the input history of the WebConsole.
+ */
+WebConsoleCommandsManager.register("clearHistory", function (owner) {
+  owner.helperResult = {
+    type: "clearHistory",
+  };
+});
+
+/**
+ * Returns the result of Object.keys(object).
+ *
+ * @param object object
+ *        Object to return the property names from.
+ * @return array of strings
+ */
+WebConsoleCommandsManager.register("keys", function (owner, object) {
+  // Need to waive Xrays so we can iterate functions and accessor properties
+  return Cu.cloneInto(Object.keys(Cu.waiveXrays(object)), owner.window);
+});
+
+/**
+ * Returns the values of all properties on object.
+ *
+ * @param object object
+ *        Object to display the values from.
+ * @return array of string
+ */
+WebConsoleCommandsManager.register("values", function (owner, object) {
+  const values = [];
+  // Need to waive Xrays so we can iterate functions and accessor properties
+  const waived = Cu.waiveXrays(object);
+  const names = Object.getOwnPropertyNames(waived);
+
+  for (const name of names) {
+    values.push(waived[name]);
+  }
+
+  return Cu.cloneInto(values, owner.window);
+});
+
+/**
+ * Opens a help window in MDN.
+ */
+WebConsoleCommandsManager.register("help", function (owner) {
+  owner.helperResult = { type: "help" };
+});
+
+/**
+ * Inspects the passed object. This is done by opening the PropertyPanel.
+ *
+ * @param object object
+ *        Object to inspect.
+ */
+WebConsoleCommandsManager.register(
+  "inspect",
+  function (owner, object, forceExpandInConsole = false) {
+    const dbgObj = owner.preprocessDebuggerObject(
+      owner.makeDebuggeeValue(object)
+    );
+
+    const grip = owner.createValueGrip(dbgObj);
+    owner.helperResult = {
+      type: "inspectObject",
+      input: owner.evalInput,
+      object: grip,
+      forceExpandInConsole,
+    };
+  }
+);
+
+/**
+ * Copy the String representation of a value to the clipboard.
+ *
+ * @param any value
+ *        A value you want to copy as a string.
+ * @return void
+ */
+WebConsoleCommandsManager.register("copy", function (owner, value) {
+  let payload;
+  try {
+    if (Element.isInstance(value)) {
+      payload = value.outerHTML;
+    } else if (typeof value == "string") {
+      payload = value;
+    } else {
+      payload = JSON.stringify(value, null, "  ");
+    }
+  } catch (ex) {
+    owner.helperResult = {
+      type: "error",
+      message: "webconsole.error.commands.copyError",
+      messageArgs: [ex.toString()],
+    };
+    return;
+  }
+  owner.helperResult = {
+    type: "copyValueToClipboard",
+    value: payload,
+  };
+});
+
+/**
+ * Take a screenshot of a page.
+ *
+ * @param object args
+ *               The arguments to be passed to the screenshot
+ * @return void
+ */
+WebConsoleCommandsManager.register("screenshot", function (owner, args = {}) {
+  owner.helperResult = {
+    type: "screenshotOutput",
+    args,
+  };
+});
+
+/**
+ * Shows a history of commands and expressions previously executed within the command line.
+ *
+ * @param object args
+ *               The arguments to be passed to the history
+ * @return void
+ */
+WebConsoleCommandsManager.register("history", function (owner, args = {}) {
+  owner.helperResult = {
+    type: "historyOutput",
+    args,
+  };
+});
+
+/**
+ * Block specific resource from loading
+ *
+ * @param object args
+ *               an object with key "url", i.e. a filter
+ *
+ * @return void
+ */
+WebConsoleCommandsManager.register("block", function (owner, args = {}) {
+  if (!args.url) {
+    owner.helperResult = {
+      type: "error",
+      message: "webconsole.messages.commands.blockArgMissing",
+    };
+    return;
+  }
+
+  owner.helperResult = {
+    type: "blockURL",
+    args,
+  };
+});
+
+/*
+ * Unblock a blocked a resource
+ *
+ * @param object filter
+ *               an object with key "url", i.e. a filter
+ *
+ * @return void
+ */
+WebConsoleCommandsManager.register("unblock", function (owner, args = {}) {
+  if (!args.url) {
+    owner.helperResult = {
+      type: "error",
+      message: "webconsole.messages.commands.blockArgMissing",
+    };
+    return;
+  }
+
+  owner.helperResult = {
+    type: "unblockURL",
+    args,
+  };
+});
diff --git a/devtools/server/actors/webconsole/commands/moz.build b/devtools/server/actors/webconsole/commands/moz.build
new file mode 100644
index 0000000000..9e0516b172
--- /dev/null
+++ b/devtools/server/actors/webconsole/commands/moz.build
@@ -0,0 +1,10 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DevToolsModules(
+    "manager.js",
+    "parser.js",
+)
diff --git a/devtools/server/actors/webconsole/commands/parser.js b/devtools/server/actors/webconsole/commands/parser.js
new file mode 100644
index 0000000000..b37d489c5f
--- /dev/null
+++ b/devtools/server/actors/webconsole/commands/parser.js
@@ -0,0 +1,249 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+loader.lazyRequireGetter(
+  this,
+  ["WebConsoleCommandsManager"],
+  "resource://devtools/server/actors/webconsole/commands/manager.js",
+  true
+);
+
+const COMMAND = "command";
+const KEY = "key";
+const ARG = "arg";
+
+const COMMAND_PREFIX = /^:/;
+const KEY_PREFIX = /^--/;
+
+// default value for flags
+const DEFAULT_VALUE = true;
+const COMMAND_DEFAULT_FLAG = {
+  block: "url",
+  screenshot: "filename",
+  unblock: "url",
+};
+
+/**
+ * When given a string that begins with `:` and a unix style string,
+ * format a JS like object.
+ * This is intended to be used by the WebConsole actor only.
+ *
+ * @param String string
+ *        A string to format that begins with `:`.
+ *
+ * @returns String formatted as `command({ ..args })`
+ */
+function formatCommand(string) {
+  if (!isCommand(string)) {
+    throw Error("formatCommand was called without `:`");
+  }
+  const tokens = string.trim().split(/\s+/).map(createToken);
+  const { command, args } = parseCommand(tokens);
+  const argsString = formatArgs(args);
+  return `${command}(${argsString})`;
+}
+
+/**
+ * collapses the array of arguments from the parsed command into
+ * a single string
+ *
+ * @param Object tree
+ *               A tree object produced by parseCommand
+ *
+ * @returns String formatted as ` { key: value, ... } ` or an empty string
+ */
+function formatArgs(args) {
+  return Object.keys(args).length ? JSON.stringify(args) : "";
+}
+
+/**
+ * creates a token object depending on a string which as a prefix,
+ * either `:` for a command or `--` for a key, or nothing for an argument
+ *
+ * @param String string
+ *               A string to use as the basis for the token
+ *
+ * @returns Object Token Object, with the following shape
+ *                { type: String, value: String }
+ */
+function createToken(string) {
+  if (isCommand(string)) {
+    const value = string.replace(COMMAND_PREFIX, "");
+    if (
+      !value ||
+      !WebConsoleCommandsManager.getAllColonCommandNames().includes(value)
+    ) {
+      throw Error(`'${value}' is not a valid command`);
+    }
+    return { type: COMMAND, value };
+  }
+  if (isKey(string)) {
+    const value = string.replace(KEY_PREFIX, "");
+    if (!value) {
+      throw Error("invalid flag");
+    }
+    return { type: KEY, value };
+  }
+  return { type: ARG, value: string };
+}
+
+/**
+ * returns a command Tree object for a set of tokens
+ *
+ *
+ * @param Array Tokens tokens
+ *                     An array of Token objects
+ *
+ * @returns Object Tree Object, with the following shape
+ *                 { command: String, args: Array of Strings }
+ */
+function parseCommand(tokens) {
+  let command = null;
+  const args = {};
+
+  for (let i = 0; i < tokens.length; i++) {
+    const token = tokens[i];
+    if (token.type === COMMAND) {
+      if (command) {
+        // we are throwing here because two commands have been passed and it is unclear
+        // what the user's intention was
+        throw Error("Invalid command");
+      }
+      command = token.value;
+    }
+
+    if (token.type === KEY) {
+      const nextTokenIndex = i + 1;
+      const nextToken = tokens[nextTokenIndex];
+      let values = args[token.value] || DEFAULT_VALUE;
+      if (nextToken && nextToken.type === ARG) {
+        const { value, offset } = collectString(
+          nextToken,
+          tokens,
+          nextTokenIndex
+        );
+        // in order for JSON.stringify to correctly output values, they must be correctly
+        // typed
+        // As per the old GCLI documentation, we can only have one value associated with a
+        // flag but multiple flags with the same name can exist and should be combined
+        // into and array.  Here we are associating only the value on the right hand
+        // side if it is of type `arg` as a single value; the second case initializes
+        // an array, and the final case pushes a value to an existing array
+        const typedValue = getTypedValue(value);
+        if (values === DEFAULT_VALUE) {
+          values = typedValue;
+        } else if (!Array.isArray(values)) {
+          values = [values, typedValue];
+        } else {
+          values.push(typedValue);
+        }
+        // skip the next token since we have already consumed it
+        i = nextTokenIndex + offset;
+      }
+      args[token.value] = values;
+    }
+
+    // Since this has only been implemented for screenshot, we can only have one default
+    // value. Eventually we may have more default values. For now, ignore multiple
+    // unflagged args
+    const defaultFlag = COMMAND_DEFAULT_FLAG[command];
+    if (token.type === ARG && !args[defaultFlag]) {
+      const { value, offset } = collectString(token, tokens, i);
+      args[defaultFlag] = getTypedValue(value);
+      i = i + offset;
+    }
+  }
+  return { command, args };
+}
+
+const stringChars = ['"', "'", "`"];
+function isStringChar(testChar) {
+  return stringChars.includes(testChar);
+}
+
+function checkLastChar(string, testChar) {
+  const lastChar = string[string.length - 1];
+  return lastChar === testChar;
+}
+
+function hasUnescapedChar(value, char, rightOffset, leftOffset) {
+  const lastPos = value.length - 1;
+  const string = value.slice(rightOffset, lastPos - leftOffset);
+  const index = string.indexOf(char);
+  if (index === -1) {
+    return false;
+  }
+  const prevChar = index > 0 ? string[index - 1] : null;
+  // return false if the unexpected character is escaped, true if it is not
+  return prevChar !== "\\";
+}
+
+function collectString(token, tokens, index) {
+  const firstChar = token.value[0];
+  const isString = isStringChar(firstChar);
+  const UNESCAPED_CHAR_ERROR = segment =>
+    `String has unescaped \`${firstChar}\` in [${segment}...],` +
+    " may miss a space between arguments";
+  let value = token.value;
+
+  // the test value is not a string, or it is a string but a complete one
+  // i.e. `"test"`, as opposed to `"foo`. In either case, this we can return early
+  if (!isString || checkLastChar(value, firstChar)) {
+    return { value, offset: 0 };
+  }
+
+  if (hasUnescapedChar(value, firstChar, 1, 0)) {
+    throw Error(UNESCAPED_CHAR_ERROR(value));
+  }
+
+  let offset = null;
+  for (let i = index + 1; i <= tokens.length; i++) {
+    if (i === tokens.length) {
+      throw Error("String does not terminate");
+    }
+
+    const nextToken = tokens[i];
+    if (nextToken.type !== ARG) {
+      throw Error(`String does not terminate before flag "${nextToken.value}"`);
+    }
+
+    value = `${value} ${nextToken.value}`;
+
+    if (hasUnescapedChar(nextToken.value, firstChar, 0, 1)) {
+      throw Error(UNESCAPED_CHAR_ERROR(value));
+    }
+
+    if (checkLastChar(nextToken.value, firstChar)) {
+      offset = i - index;
+      break;
+    }
+  }
+  return { value, offset };
+}
+
+function isCommand(string) {
+  return COMMAND_PREFIX.test(string);
+}
+
+function isKey(string) {
+  return KEY_PREFIX.test(string);
+}
+
+function getTypedValue(value) {
+  if (!isNaN(value)) {
+    return Number(value);
+  }
+  if (value === "true" || value === "false") {
+    return Boolean(value);
+  }
+  if (isStringChar(value[0])) {
+    return value.slice(1, value.length - 1);
+  }
+  return value;
+}
+
+exports.formatCommand = formatCommand;
+exports.isCommand = isCommand;