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const MAX_EXTRA_SPACE = 1024 * 1024 * 5; // 5mb
const attrs = {
SRC: 1,
SRCSET: 2,
HREF: 3,
XLINKHREF: 4,
DATA: 6,
CODE: 7,
STYLE: 8,
OTHER: 10,
};
function generateIs(str) {
str = str.split('').map((x) => x.replace(':', 'COLON'));
const mapBack = (s) => {
if (s === 'COLON') return ':';
return s;
};
const body = str
.map((s) => `(${s} === ${mapBack(s).toLowerCase().charCodeAt(0)} || ${s} === ${mapBack(s).toUpperCase().charCodeAt(0)})`)
.join(' && ');
/* eslint-disable */
return Function(...str, `return ${body}`);
}
const isSrc = generateIs('src');
const isSrcSet = generateIs('srcset');
const isXlinkHref = generateIs('xlink:href');
const isHref = generateIs('href');
const isData = generateIs('data');
const isCode = generateIs('code');
const isStyle = generateIs('style');
const c = {
ANGLE_OPEN: '<'.charCodeAt(0),
ANGLE_CLOSE: '>'.charCodeAt(0),
SLASH_N: '\n'.charCodeAt(0),
SLASH_R: '\r'.charCodeAt(0),
D_QUOTE: '"'.charCodeAt(0),
QUOTE: "'".charCodeAt(0),
EXCLAM_MARK: '!'.charCodeAt(0),
BIG_A: 'A'.charCodeAt(0),
BIG_Z: 'Z'.charCodeAt(0),
SMALL_A: 'a'.charCodeAt(0),
SMALL_Z: 'z'.charCodeAt(0),
ZERO: '0'.charCodeAt(0),
NINE: '9'.charCodeAt(0),
S: 'S'.charCodeAt(0),
s: 's'.charCodeAt(0),
R: 'R'.charCodeAt(0),
r: 'r'.charCodeAt(0),
C: 'C'.charCodeAt(0),
c: 'c'.charCodeAt(0),
H: 'H'.charCodeAt(0),
h: 'h'.charCodeAt(0),
E: 'E'.charCodeAt(0),
e: 'e'.charCodeAt(0),
F: 'F'.charCodeAt(0),
f: 'f'.charCodeAt(0),
T: 'T'.charCodeAt(0),
t: 't'.charCodeAt(0),
EQUALS: '='.charCodeAt(0),
SLASH: '/'.charCodeAt(0),
DASH: '-'.charCodeAt(0)
};
class Generator {
constructor(data, mapping, baseUrl) {
this.reset(data, mapping, baseUrl);
this.replaced = Buffer.alloc(data.length + MAX_EXTRA_SPACE); // output prealloc, can be reused between runs
}
reset(data, mapping, baseUrl) {
this.data = data;
this.len = data.length;
this.mapping = mapping;
this.baseUrl = baseUrl;
this.i = 0; // data pointer
this.j = 0; // replaced pointer
}
result() {
return Buffer.from(this.replaced.slice(0, this.j));
}
parse() {
this.parseWalking();
}
parseWalking() {
while (this.lenOk()) {
while (this.lenOk() && this.data[this.i] !== c.ANGLE_OPEN) { // outside of tag
this.addAndProgress();
}
if (this.data[this.i + 1] === c.EXCLAM_MARK && this.data[this.i + 2] === c.DASH) {
this.parseComment();
continue;
}
if (this.lenOk()) {
this.parseTag();
}
}
}
parseComment() {
while (!(this.current() === c.DASH && this.data[this.i + 1] === c.ANGLE_CLOSE) && this.lenOk()) {
this.addAndProgress();
}
this.addAndProgress();// -
this.addAndProgress();// >
}
parseTag() {
this.addAndProgress(); // <
if (this.current() === c.SLASH) { // closing tag
while (this.current() !== c.ANGLE_CLOSE && this.lenOk()) {
this.addAndProgress();
}
Eif (this.current() === c.ANGLE_CLOSE) {
this.addAndProgress(); // add >
}
return;
}
const tagName = this.parseTagName();
this.processWhitespace();
while (this.current() !== c.ANGLE_CLOSE && this.lenOk()) {
if (this.current() === c.SLASH) { // /> in tag which is a noop, as an optimization we don't check the following angle-close
this.addAndProgress();
continue;
}
const attribute = this.parseTagAttributeName();
if (this.current() !== c.EQUALS) {
this.processWhitespace();
continue;
}
this.addAndProgress(); // read the =
const quoteType = this.readQuote();
if (!this.isInterestingTagAttrName(tagName, attribute)) {
this.readTagAttributeValue(quoteType);
this.processWhitespace();
continue;
}
const fromHtml = this.parseTagAttributeValueWithoutProgressingReplaced(quoteType);
let value = '';
if (attribute === attrs.STYLE) {
value = this.cssProcessor ? this.cssProcessor(fromHtml, this.mapping, this.baseUrl, true) : fromHtml;
} else if (tagName === 'base') {
this.baseUrl = new URL(fromHtml, this.baseUrl);
// TODO deal with the case the base tag appears _AFTER_ links, we need to "go back" and replace all links in this case
// which is very lame
value = ''; // write empty base
} else {
value = this.getLink(attribute, fromHtml);
}
// console.log("tag", tagName, "attr", attribute, fromHtml, "->", value);
for (let k = 0; k < value.length; k++) {
this.replaced[this.j++] = value.charCodeAt(k); // in practice, this should replace the value with url resolution if helpful
}
if (quoteType !== 0) { // had quote, add same quote
this.replaced[this.j++] = quoteType;
}
this.processWhitespace();
}
Eif (this.current() === c.ANGLE_CLOSE) {
this.addAndProgress(); // add >
}
if (tagName === 'style') {
return this.parseStyleTag(); // style tag handling
}
}
parseStyleTag() {
// special style tag handling, can't nest, treat whole content as CSS
let initial = this.i;
const isEnd = () =>
this.current() === c.ANGLE_OPEN &&
this.data[this.i + 1] === c.SLASH &&
isStyle(
this.data[this.i + 2],
this.data[this.i + 3],
this.data[this.i + 4],
this.data[this.i + 5],
this.data[this.i + 6]
);
while(!isEnd()) {
this.i++;
}
let styleContents = this.data.slice(initial, this.i);
let value = this.cssProcessor && this.cssProcessor(styleContents, this.mapping, this.baseUrl);
let buffered = Buffer.from(value); // might be string
buffered.copy(this.replaced, this.j);
this.j += buffered.length;
this.addAndProgress(); // <
this.addAndProgress(); // /
this.addAndProgress(); // s
this.addAndProgress(); // t
this.addAndProgress(); // y
this.addAndProgress(); // l
this.addAndProgress(); // e
}
getLink(attribute, fromHtml) {
if (fromHtml.charAt(0) === '#') { // internal hash
return fromHtml;
}
let lastSeenHash = '';
const resolveLink = link => {
try {
let url = new URL(link, this.baseUrl);
lastSeenHash = url.hash;
url.hash = '';
return url.toString();
} catch (e) {
return link
}
};
if (attribute === attrs.SRCSET) {
return fromHtml.split(' ').map(resolveLink).map(part => this.mapping.get(part) || part).join(' ');
}
const link = resolveLink(fromHtml);
let result = this.mapping.get(link) || link;
if (lastSeenHash) { // srcset can't have hash
result += lastSeenHash
}
return result;
}
isInterestingTagAttrName(tagName, attribute) {
if (attribute === attrs.OTHER) {
return false;
}
if (attribute === attrs.SRC || attribute === attrs.SRCSET) {
return true; // [src],[srcset]
}
if (attribute === attrs.HREF) {
return tagName === 'link' || tagName === 'feimage' || tagName === 'image' || tagName === 'base'; // link[href];
}
Iif (attribute === attrs.DATA) {
return tagName === 'object';
}
if (attribute === attrs.CODE) {
return tagName === 'applet';
}
if (attribute === attrs.XLINKHREF) {
return tagName === 'feimage' || tagName === 'image' || tagName === 'use';
}
Eif (attribute === attrs.STYLE) {
return true;
}
/* istanbul ignore next unreachable */
return false;
}
readQuote() {
if (this.current() === c.QUOTE) {
this.addAndProgress();
return c.QUOTE;
}
if (this.current() === c.D_QUOTE) {
this.addAndProgress();
return c.D_QUOTE;
}
return 0; // unescaped attribute value, read until whitespace
}
readTagAttributeValue(quoteCharCode) {
if (quoteCharCode !== 0) { // escaped
while (this.current() !== quoteCharCode && this.lenOk()) {
this.addAndProgress();
}
this.addAndProgress();
} else { // unescaped
while (!isWhitespace(this.current()) && !(this.current() === c.ANGLE_CLOSE) && this.lenOk()) {
this.addAndProgress();
}
}
}
parseTagAttributeValueWithoutProgressingReplaced(quoteCharCode) {
const initial = this.i;
if (quoteCharCode !== 0) { // escaped
while (this.current() !== quoteCharCode && this.lenOk()) {
this.i++;
}
this.i++; // read the quote
return this.data.toString('utf8', initial, this.i - 1);
} // unescaped
while (!isWhitespace(this.current()) && (this.current() !== c.ANGLE_CLOSE) && this.lenOk()) {
this.i++;
}
return this.data.toString('utf8', initial, this.i);
}
current() {
return this.data[this.i];
}
parseTagAttributeName() {
const initial = this.i;
while (this.current() !== c.EQUALS && !isWhitespace(this.current()) && this.lenOk()) {
this.addAndProgress();
}
const len = this.i - initial;
const data = this.data;
// console.log(this.data.toString("utf8", initial, this.i));
if (len === 3) {
if (isSrc(data[initial], data[initial + 1], data[initial + 2])) {
return attrs.SRC;
}
return attrs.OTHER;
}
if (len === 4) {
if (isHref(data[initial], data[initial + 1], data[initial + 2], data[initial + 3])) {
return attrs.HREF;
}
if (isCode(data[initial], data[initial + 1], data[initial + 2], data[initial + 3])) {
return attrs.CODE;
}
if (isData(data[initial], data[initial + 1], data[initial + 2], data[initial + 3])) {
return attrs.DATA;
}
return attrs.OTHER;
}
if (len === 5) {
if (isStyle(data[initial], data[initial + 1],data[initial + 2], data[initial + 3], data[initial + 4])) {
return attrs.STYLE;
}
return attrs.OTHER;
}
if (len === 6) {
if (isSrcSet(
data[initial], data[initial + 1],data[initial + 2], data[initial + 3], data[initial + 4], data[initial + 5]
)) {
return attrs.SRCSET;
}
return attrs.OTHER;
}
if (len === 10) {
Eif (isXlinkHref(
data[initial],
data[initial + 1],
data[initial + 2],
data[initial + 3],
data[initial + 4],
data[initial + 5],
data[initial + 6],
data[initial + 7],
data[initial + 8],
data[initial + 9])) {
return attrs.XLINKHREF;
}
}
return attrs.OTHER;
}
processWhitespace() {
while (isWhitespace(this.current()) && this.lenOk()) {
this.addAndProgress();
}
}
parseTagName() {
const initial = this.i;
while (this.current() !== c.ANGLE_CLOSE && !isWhitespace(this.current()) && this.lenOk()) {
this.addAndProgress();
}
// TODO no need to allocate all these strings!
return this.data.toString('utf8', initial, this.i).toLowerCase();
}
addAndProgress() {
this.replaced[this.j] = this.data[this.i];
this.i++;
this.j++;
}
/* istanbul ignore next */
dumpIf(fn = () => true, logger = false) {
let next100 = this.data.slice(this.i, this.i + 100).toString();
if (fn(next100)) {
console.log(new Error().stack);
console.log(logger ? logger(next100) : next100);
}
}
lenOk() {
return this.i < this.len;
}
}
function isWhitespace(charCode) {
switch (charCode) {
case (0x0009):
case (0x000B):
case (0x000C):
case (0x0020):
case (0x000A):
case (0x000D):
return true;
default:
return false;
}
}
module.exports = Generator;
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