ng-packagr
Version:
Compile and package Angular libraries in Angular Package Format (APF)
165 lines • 6.18 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.findUrls = findUrls;
/**
* Determines if a unicode code point is a CSS whitespace character.
* @param code The unicode code point to test.
* @returns true, if the code point is CSS whitespace; false, otherwise.
*/
function isWhitespace(code) {
// Based on https://www.w3.org/TR/css-syntax-3/#whitespace
switch (code) {
case 0x0009: // tab
case 0x0020: // space
case 0x000a: // line feed
case 0x000c: // form feed
case 0x000d: // carriage return
return true;
default:
return false;
}
}
/**
* Scans a CSS or Sass file and locates all valid url function values as defined by the
* syntax specification.
* @param contents A string containing a CSS or Sass file to scan.
* @returns An iterable that yields each CSS url function value found.
*/
function* findUrls(contents) {
let pos = 0;
let width = 1;
let current = -1;
const next = () => {
var _a;
pos += width;
current = (_a = contents.codePointAt(pos)) !== null && _a !== void 0 ? _a : -1;
width = current > 0xffff ? 2 : 1;
return current;
};
// Based on https://www.w3.org/TR/css-syntax-3/#consume-ident-like-token
while ((pos = contents.indexOf('url(', pos)) !== -1) {
width = 1;
// Ensure whitespace, comma, or colon before `url(`
if (pos > 0) {
pos -= 2;
next();
if (!isWhitespace(current) && current !== 0x002c && current !== 0x003a) {
// Skip - not a url token
pos += 3;
continue;
}
pos += 1;
}
// Set to position of the (
pos += 3;
// Consume all leading whitespace
while (isWhitespace(next())) {
/* empty */
}
// Initialize URL state
const url = { start: pos, end: -1, value: '' };
let complete = false;
// If " or ', then consume the value as a string
if (current === 0x0022 || current === 0x0027) {
const ending = current;
// Based on https://www.w3.org/TR/css-syntax-3/#consume-string-token
while (!complete) {
switch (next()) {
case -1: // EOF
return;
case 0x000a: // line feed
case 0x000c: // form feed
case 0x000d: // carriage return
// Invalid
complete = true;
break;
case 0x005c: // \ -- character escape
// If not EOF or newline, add the character after the escape
switch (next()) {
case -1:
return;
case 0x000a: // line feed
case 0x000c: // form feed
case 0x000d: // carriage return
// Skip when inside a string
break;
default:
// TODO: Handle hex escape codes
url.value += String.fromCodePoint(current);
break;
}
break;
case ending:
// Full string position should include the quotes for replacement
url.end = pos + 1;
complete = true;
yield url;
break;
default:
url.value += String.fromCodePoint(current);
break;
}
}
next();
continue;
}
// Based on https://www.w3.org/TR/css-syntax-3/#consume-url-token
while (!complete) {
switch (current) {
case -1: // EOF
return;
case 0x0022: // "
case 0x0027: // '
case 0x0028: // (
// Invalid
complete = true;
break;
case 0x0029: // )
// URL is valid and complete
url.end = pos;
complete = true;
break;
case 0x005c: // \ -- character escape
// If not EOF or newline, add the character after the escape
switch (next()) {
case -1: // EOF
return;
case 0x000a: // line feed
case 0x000c: // form feed
case 0x000d: // carriage return
// Invalid
complete = true;
break;
default:
// TODO: Handle hex escape codes
url.value += String.fromCodePoint(current);
break;
}
break;
default:
if (isWhitespace(current)) {
while (isWhitespace(next())) {
/* empty */
}
// Unescaped whitespace is only valid before the closing )
if (current === 0x0029) {
// URL is valid
url.end = pos;
}
complete = true;
}
else {
// Add the character to the url value
url.value += String.fromCodePoint(current);
}
break;
}
next();
}
// An end position indicates a URL was found
if (url.end !== -1) {
yield url;
}
}
}
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