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* URL parameter handling for jsbeeb
*/
/**
* Check if a value is defined (not null and not undefined)
* @param {*} value - The value to check
* @returns {boolean} True if the value is neither null nor undefined
*/
function isDefined(value) {
return value !== null && value !== undefined;
}
/**
* @typedef {"string"|"array"|"int"|"float"|"bool"|"boolDefaultTrue"} ParamType
*/
/**
* Parameter type enum to avoid string literals
* @enum {string}
*/
export const ParamTypes = {
/** String parameter (default) */
STRING: "string",
/** Array parameter (for parameters that can appear multiple times) */
ARRAY: "array",
/** Integer parameter */
INT: "int",
/** Float parameter */
FLOAT: "float",
/** Boolean parameter (true if present, regardless of value) */
BOOL: "bool",
/** Boolean parameter the page takes as true when absent, so the URL carries it as `key=false` when it is off */
BOOL_DEFAULT_TRUE: "boolDefaultTrue",
};
/**
* Parse a query string into an object
* @param {string} queryString - The query string to parse
* @param {(name: string) => ParamType|undefined} [typeOf] - The type of the parameter `name`, STRING if none
* @returns {Object} Object containing parsed query parameters
*/
export function parseQueryString(queryString, typeOf = () => undefined) {
if (!queryString) return {};
const parsedQuery = {};
queryString.split("&").forEach(function (keyval) {
if (!keyval) return;
const keyAndVal = keyval.split("=");
const key = decodeURIComponent(keyAndVal[0]);
let val = null;
if (keyAndVal.length > 1) val = decodeURIComponent(keyAndVal.slice(1).join("="));
const paramType = typeOf(key) ?? ParamTypes.STRING;
switch (paramType) {
case ParamTypes.ARRAY:
if (!parsedQuery[key]) {
parsedQuery[key] = [];
}
parsedQuery[key].push(val);
break;
case ParamTypes.INT:
Eif (val !== undefined) {
const parsed = parseInt(val, 10);
parsedQuery[key] = isNaN(parsed) ? 0 : parsed;
}
break;
case ParamTypes.FLOAT:
Eif (val !== undefined) {
const parsed = parseFloat(val);
parsedQuery[key] = isNaN(parsed) ? 0 : parsed;
}
break;
case ParamTypes.BOOL:
case ParamTypes.BOOL_DEFAULT_TRUE:
// Only the exact 'false' string is treated as false.
parsedQuery[key] = val !== "false";
break;
case ParamTypes.STRING:
default:
parsedQuery[key] = val;
break;
}
});
return parsedQuery;
}
/**
* Parse the parameters of a page's location: those in its query, and those after its hash.
* @param {{search: string, hash: string}} location - A Location or URL
* @param {(name: string) => ParamType|undefined} [typeOf] - The type of the parameter `name`, STRING if none
* @returns {Object} Object containing parsed query parameters
*/
export function parseLocationParams(location, typeOf = () => undefined) {
return parseQueryString(location.search.substring(1) + "&" + location.hash.substring(1), typeOf);
}
/**
* Characters RFC 3986 allows literally in a query that `encodeURIComponent` escapes anyway. `&`,
* `=`, `+`, `#`, `%` and space are left escaped because they delimit something, and `?` because a
* URL with a second one in it reads as broken even though the grammar permits it.
*/
const QueryLiterals = "$,/:;@";
const EscapedQueryLiterals = new RegExp(
[...QueryLiterals].map((char) => `%${char.charCodeAt(0).toString(16).toUpperCase()}`).join("|"),
"g",
);
/**
* Percent-encode a key or value for a query string, escaping only what delimits something
* @param {string} component - The key or value to encode
* @returns {string} The encoded component
*/
function encodeQueryComponent(component) {
return encodeURIComponent(component).replace(EscapedQueryLiterals, decodeURIComponent);
}
/**
* Append a parameter to the URL
* @param {string} url - Current URL
* @param {string} sep - Current separator (? or &)
* @param {string} key - Parameter key
* @param {string} [value] - Parameter value (optional for boolean parameters)
* @returns {Object} Updated URL and separator
*/
function appendParam(url, sep, key, value = undefined) {
url += sep + encodeQueryComponent(key);
if (value !== undefined) {
url += "=" + encodeQueryComponent(value);
}
return { url, sep: "&" };
}
/**
* Build a URL string from base URL and query parameters
* @param {string} baseUrl - The base URL (without query string)
* @param {Object} parsedQuery - Object containing query parameters
* @param {(name: string) => ParamType|undefined} [typeOf] - The type of the parameter `name`, STRING if none
* @returns {string} The complete URL with query parameters
*/
export function buildUrlFromParams(baseUrl, parsedQuery, typeOf = () => undefined) {
let url = baseUrl;
let sep = "?";
Object.entries(parsedQuery).forEach(([key, value]) => {
Iif (key.length === 0) return;
const paramType = typeOf(key) ?? ParamTypes.STRING;
switch (paramType) {
case ParamTypes.ARRAY:
// Handle array parameters - each item becomes a separate parameter
if (Array.isArray(value) && value.length > 0) {
value.forEach((val) => {
Eif (isDefined(val)) {
const result = appendParam(url, sep, key, val);
url = result.url;
sep = result.sep;
}
});
}
break;
case ParamTypes.BOOL:
// For boolean params, only add the key without value if true
if (value === true) {
const result = appendParam(url, sep, key);
url = result.url;
sep = result.sep;
}
break;
case ParamTypes.BOOL_DEFAULT_TRUE:
if (typeof value === "boolean") {
const result = appendParam(url, sep, key, value ? undefined : "false");
url = result.url;
sep = result.sep;
}
break;
case ParamTypes.INT:
case ParamTypes.FLOAT:
case ParamTypes.STRING:
default:
// Include the parameter if it has a value (including zero)
if (isDefined(value) && value !== "") {
const result = appendParam(url, sep, key, value);
url = result.url;
sep = result.sep;
}
break;
}
});
return url;
}
/**
* Process autoboot and other emulation parameters
* @param {Object} parsedQuery - The parsed query parameters
* @returns {{needsAutoboot: "none"|"boot"|"chain"|"run"|"type", autoType: string}} how the page boots
*/
export function processAutobootParams(parsedQuery) {
let needsAutoboot = "none";
let autoType = "";
if (isDefined(parsedQuery.autoboot)) {
needsAutoboot = "boot";
} else if (isDefined(parsedQuery.autochain)) {
needsAutoboot = "chain";
} else if (isDefined(parsedQuery.autorun)) {
needsAutoboot = "run";
} else if (isDefined(parsedQuery.autotype)) {
needsAutoboot = "type";
autoType = parsedQuery.autotype;
}
return { needsAutoboot, autoType };
}
/** How the page was asked to boot: as `processAutobootParams` says, or `basic` for a BASIC program in the URL. */
export function bootModeOf(parsedQuery) {
if (parsedQuery.loadBasic || parsedQuery.embedBasic) return "basic";
return processAutobootParams(parsedQuery).needsAutoboot;
}
/** Where a drive's 40/80 switch is set, `auto` leaving it to whatever disc is loaded. */
export const DriveTracks = Object.freeze({ auto: "auto", forty: "40", eighty: "80" });
const NumDrives = 2;
/**
* Process the per-drive 40/80 track settings
* @param {Object} parsedQuery - The parsed query parameters
* @returns {{settings: string[], warnings: string[]}} One DriveTracks per drive, and what was
* unusable about anything asked for that is not in there
*/
export function processDriveTrackParams(parsedQuery) {
const warnings = [];
const settings = [];
for (let driveIndex = 0; driveIndex < NumDrives; ++driveIndex) {
const name = `drive${driveIndex}Tracks`;
const asked = parsedQuery[name];
const setting = isDefined(asked) ? `${asked}`.toLowerCase() : DriveTracks.auto;
if (Object.values(DriveTracks).includes(setting)) {
settings.push(setting);
} else {
warnings.push(`${name}=${asked}: a drive is set to 40, 80 or auto.`);
settings.push(DriveTracks.auto);
}
}
return { settings, warnings };
}
/**
* Guess the appropriate model based on the hostname
* @param {string} hostname - The hostname to check
* @returns {string} Model identifier
*/
export function guessModelFromHostname(hostname) {
if (hostname.startsWith("bbc")) return "B-DFS1.2";
if (hostname.startsWith("master")) return "Master";
if (hostname.startsWith("atom")) return "Atom";
return "B-DFS1.2";
}
/**
* Parse disc images from the query parameters
* @param {Object} parsedQuery - The query parameters
* @returns {Object} Object containing disc information
* - discImage: disc image URL (?disc1= or, failing that, ?disc=)
* - secondDiscImage: second disc URL (?disc2=)
* - mmcImage: MMC/SD card image URL (?mmc=, Atom only)
*/
export function parseMediaParams(parsedQuery) {
const { disc, disc1, disc2, mmc } = parsedQuery;
// disc1 is the name the drives use; a bare disc is the older spelling, and gives way to it.
const discImage = disc1 || disc;
return { discImage, secondDiscImage: disc2, mmcImage: mmc };
}
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