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index.js
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index.js
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/// <reference path="./jsx.d.ts" />
/// <reference types="./suspense.d.ts" />
/// <reference types="./error-boundary.d.ts" />
const ESCAPED_REGEX = /[<"'&]/;
const CAMEL_REGEX = /[a-z][A-Z]/;
/** @type {import('.').isUpper} */
function isUpper(input, index) {
const code = input.charCodeAt(index);
return code >= 65 /* A */ && code <= 90; /* Z */
}
/** @type {import('.').toKebabCase} */
function toKebabCase(camel) {
// This is a optimization to avoid the whole conversion process when the
// string does not contain any uppercase characters.
if (!CAMEL_REGEX.test(camel)) {
return camel;
}
const length = camel.length;
let start = 0,
end = 0,
kebab = '',
prev = true,
curr = isUpper(camel, 0),
next;
for (; end < length; end++) {
next = isUpper(camel, end + 1);
// detects the start of a new camel case word and avoid lowercasing abbreviations.
if (!prev && curr && !next) {
// @ts-expect-error - this indexing is safe.
kebab += camel.slice(start, end) + '-' + camel[end].toLowerCase();
start = end + 1;
}
prev = curr;
curr = next;
}
// Appends the remaining string.
kebab += camel.slice(start, end);
return kebab;
}
/** @type {import('.').escape} */
function escape(strings, ...values) {
const stringsLength = strings.length,
valuesLength = values.length;
let index = 0,
result = '';
for (; index < stringsLength; index++) {
result += strings[index];
if (index < valuesLength) {
result += values[index];
}
}
// Escape the entire string at once.
// This is faster than escaping each piece individually.
return escapeHtml(result);
}
/** @type {import('.').escapeHtml} */
let escapeHtml = function (value) {
if (typeof value !== 'string') {
value = value.toString();
}
// This is a optimization to avoid the whole conversion process when the
// string does not contain any uppercase characters.
if (!ESCAPED_REGEX.test(value)) {
return value;
}
const length = value.length;
let escaped = '',
start = 0,
end = 0;
// Escapes double quotes to be used inside attributes
// Faster than using regex
// https://jsperf.app/kakihu
for (; end < length; end++) {
// https://wonko.com/post/html-escaping
switch (value[end]) {
case '&':
escaped += value.slice(start, end) + '&';
start = end + 1;
continue;
// We don't need to escape > because it is only used to close tags.
// https://stackoverflow.com/a/9189067
case '<':
escaped += value.slice(start, end) + '<';
start = end + 1;
continue;
case '"':
escaped += value.slice(start, end) + '"';
start = end + 1;
continue;
case "'":
escaped += value.slice(start, end) + ''';
start = end + 1;
continue;
}
}
// Appends the remaining string.
escaped += value.slice(start, end);
return escaped;
};
/* c8 ignore next 2 */
// @ts-ignore - bun runtime have its own escapeHTML function.
if (typeof Bun !== 'undefined') escapeHtml = Bun.escapeHTML;
/** @type {import('.').isVoidElement} */
function isVoidElement(tag) {
// Ordered by most common to least common.
return (
tag === 'meta' ||
tag === 'link' ||
tag === 'img' ||
tag === 'br' ||
tag === 'input' ||
tag === 'hr' ||
tag === 'area' ||
tag === 'base' ||
tag === 'col' ||
tag === 'command' ||
tag === 'embed' ||
tag === 'keygen' ||
tag === 'param' ||
tag === 'source' ||
tag === 'track' ||
tag === 'wbr'
);
}
/** @type {import('.').styleToString} */
function styleToString(style) {
// Faster escaping process that only looks for the " character.
// As we use the " character to wrap the style string, we need to escape it.
if (typeof style === 'string') {
let end = style.indexOf('"');
// This is a optimization to avoid having to look twice for the " character.
// And make the loop already start in the middle
if (end === -1) {
return style;
}
const length = style.length;
let escaped = '',
start = 0;
// Escapes double quotes to be used inside attributes
// Faster than using regex
// https://jsperf.app/kakihu
for (; end < length; end++) {
if (style[end] === '"') {
escaped += style.slice(start, end) + '"';
start = end + 1;
}
}
// Appends the remaining string.
escaped += style.slice(start, end);
return escaped;
}
const keys = Object.keys(style),
length = keys.length;
let key,
value,
end,
start,
index = 0,
result = '';
for (; index < length; index++) {
key = keys[index];
// @ts-expect-error - this indexing is safe.
value = style[key];
if (value === null || value === undefined) {
continue;
}
// @ts-expect-error - this indexing is safe.
result += toKebabCase(key) + ':';
// Only needs escaping when the value is a string.
if (typeof value !== 'string') {
result += value.toString() + ';';
continue;
}
end = value.indexOf('"');
// This is a optimization to avoid having to look twice for the " character.
// And make the loop already start in the middle
if (end === -1) {
result += value + ';';
continue;
}
const length = value.length;
start = 0;
// Escapes double quotes to be used inside attributes
// Faster than using regex
// https://jsperf.app/kakihu
for (; end < length; end++) {
if (value[end] === '"') {
result += value.slice(start, end) + '"';
start = end + 1;
}
}
// Appends the remaining string.
result += value.slice(start, end) + ';';
}
return result;
}
/** @type {import('.').attributesToString} */
function attributesToString(attributes) {
const keys = Object.keys(attributes);
const length = keys.length;
let key,
value,
type,
end,
start,
classItems,
valueLength,
result = '',
index = 0;
for (; index < length; index++) {
key = keys[index];
// Skips all @kitajs/html specific attributes.
if (key === 'children' || key === 'safe' || key === 'of') {
continue;
}
// @ts-expect-error - this indexing is safe.
value = attributes[key];
// React className compatibility.
if (key === 'className') {
// @ts-expect-error - both were provided, so use the class attribute.
if (attributes.class !== undefined) {
continue;
}
key = 'class';
} else if (key === 'class' && Array.isArray(value)) {
classItems = value;
valueLength = value.length;
// Reuses the value variable
value = '';
for (let i = 0; i < valueLength; i++) {
if (classItems[i] && classItems[i].length > 0) {
if (value) {
value += ' ' + classItems[i].trim();
} else {
value += classItems[i].trim();
}
}
}
// All attributes may have been disabled.
if (value.length === 0) {
continue;
}
} else if (key === 'style') {
result += ' style="' + styleToString(value) + '"';
continue;
} else if (key === 'attrs') {
if (typeof value === 'string') {
result += ' ' + value;
} else {
result += attributesToString(value);
}
continue;
}
type = typeof value;
if (type === 'boolean') {
// Only add the attribute if the value is true.
if (value) {
result += ' ' + key;
}
continue;
}
if (value === null || value === undefined) {
continue;
}
result += ' ' + key;
if (type !== 'string') {
// Non objects are
if (type !== 'object') {
result += '="' + value.toString() + '"';
continue;
}
// Dates are always safe
if (value instanceof Date) {
result += '="' + value.toISOString() + '"';
continue;
}
// The object may have a overridden toString method.
// Which results in a non escaped string.
value = value.toString();
}
end = value.indexOf('"');
// This is a optimization to avoid having to look twice for the " character.
// And make the loop already start in the middle
if (end === -1) {
result += '="' + value + '"';
continue;
}
result += '="';
valueLength = value.length;
start = 0;
// Escapes double quotes to be used inside attributes
// Faster than using regex
// https://jsperf.app/kakihu
for (; end < valueLength; end++) {
if (value[end] === '"') {
result += value.slice(start, end) + '"';
start = end + 1;
}
}
// Appends the remaining string.
result += value.slice(start, end) + '"';
}
return result;
}
/**
* @type {import('.').contentsToString}
* @returns {any}
*/
function contentsToString(contents, escape) {
let length = contents.length;
let result = '';
for (let index = 0; index < length; index++) {
const content = contents[index];
switch (typeof content) {
case 'string':
case 'number':
case 'boolean':
case 'bigint':
result += content;
continue;
}
if (!content) {
continue;
}
if (Array.isArray(content)) {
contents.splice(index--, 1, ...content);
length += content.length - 1;
continue;
}
// @ts-ignore - Type instantiation is excessively deep and possibly infinite.
return Promise.all(contents.slice(index)).then(function resolveContents(resolved) {
resolved.unshift(result);
return contentsToString(resolved, escape);
});
}
// escapeHtml is faster with longer strings, that's
// why we escape the entire result once
if (escape === true) {
return escapeHtml(result);
}
return result;
}
/**
* @param {import('./index').Children} content
* @param {boolean} safe
* @returns {JSX.Element}
*/
function contentToString(content, safe) {
switch (typeof content) {
case 'string':
return safe ? escapeHtml(content) : content;
case 'number':
case 'boolean':
case 'bigint':
return content.toString();
}
if (!content) {
return '';
}
if (Array.isArray(content)) {
return contentsToString(content, safe);
}
return content.then(function resolveContent(resolved) {
return contentToString(resolved, safe);
});
}
/**
* Just to stop TS from complaining about the type.
*
* @type {import('.').createElement}
* @param {any} name
* @returns {any}
*/
function createElement(name, attrs, ...children) {
const hasAttrs = attrs !== null;
// Calls the element creator function if the name is a function
if (typeof name === 'function') {
// We at least need to pass the children to the function component. We may receive null if this
// component was called without any children.
if (!hasAttrs) {
return name({ children: children.length > 1 ? children : children[0] });
}
attrs.children = children.length > 1 ? children : children[0];
return name(attrs);
}
// Switches the tag name when this custom `tag` is present.
if (hasAttrs && name === 'tag') {
name = /** @type {string} */ (attrs.of);
}
const attributes = hasAttrs ? attributesToString(attrs) : '';
if (children.length === 0) {
return isVoidElement(name)
? '<' + name + attributes + '/>'
: '<' + name + attributes + '></' + name + '>';
}
const contents = contentsToString(children, hasAttrs && attrs.safe);
if (typeof contents === 'string') {
return '<' + name + attributes + '>' + contents + '</' + name + '>';
}
return contents.then(function resolveContents(contents) {
return '<' + name + attributes + '>' + contents + '</' + name + '>';
});
}
/** @type {import('.').Fragment} */
function Fragment(props) {
return contentsToString([props.children]);
}
exports.escape = escape;
exports.e = escape;
exports.escapeHtml = escapeHtml;
exports.isVoidElement = isVoidElement;
exports.attributesToString = attributesToString;
exports.toKebabCase = toKebabCase;
exports.isUpper = isUpper;
exports.styleToString = styleToString;
exports.createElement = createElement;
exports.h = createElement;
exports.contentsToString = contentsToString;
exports.contentToString = contentToString;
exports.Fragment = Fragment;