@angular-devkit/build-angular
Version:
Angular Webpack Build Facade
248 lines • 27.4 kB
JavaScript
;
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.findImports = exports.findUrls = void 0;
// TODO: Combine everything into a single pass lexer
/**
* 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 = () => {
pos += width;
current = contents.codePointAt(pos) ?? -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) {
// Set to position of the (
pos += 3;
width = 1;
// 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;
}
}
}
exports.findUrls = findUrls;
/**
* Scans a CSS or Sass file and locates all valid import/use directive 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 directive value found.
*/
function* findImports(contents) {
yield* find(contents, '@import ');
yield* find(contents, '@use ');
}
exports.findImports = findImports;
/**
* Scans a CSS or Sass file and locates all valid function/directive values as defined by the
* syntax specification.
* @param contents A string containing a CSS or Sass file to scan.
* @param prefix The prefix to start a valid segment.
* @returns An iterable that yields each CSS url function value found.
*/
function* find(contents, prefix) {
let pos = 0;
let width = 1;
let current = -1;
const next = () => {
pos += width;
current = contents.codePointAt(pos) ?? -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(prefix, pos)) !== -1) {
// Set to position of the last character in prefix
pos += prefix.length - 1;
width = 1;
// Consume all leading whitespace
while (isWhitespace(next())) {
/* empty */
}
// Initialize URL state
const url = { start: pos, end: -1, specifier: '' };
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.specifier += 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.specifier += String.fromCodePoint(current);
break;
}
}
next();
continue;
}
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\n// TODO: Combine everything into a single pass lexer\n\n/**\n * Determines if a unicode code point is a CSS whitespace character.\n * @param code The unicode code point to test.\n * @returns true, if the code point is CSS whitespace; false, otherwise.\n */\nfunction isWhitespace(code: number): boolean {\n  // Based on https://www.w3.org/TR/css-syntax-3/#whitespace\n  switch (code) {\n    case 0x0009: // tab\n    case 0x0020: // space\n    case 0x000a: // line feed\n    case 0x000c: // form feed\n    case 0x000d: // carriage return\n      return true;\n    default:\n      return false;\n  }\n}\n\n/**\n * Scans a CSS or Sass file and locates all valid url function values as defined by the\n * syntax specification.\n * @param contents A string containing a CSS or Sass file to scan.\n * @returns An iterable that yields each CSS url function value found.\n */\nexport function* findUrls(\n  contents: string,\n): Iterable<{ start: number; end: number; value: string }> {\n  let pos = 0;\n  let width = 1;\n  let current = -1;\n  const next = () => {\n    pos += width;\n    current = contents.codePointAt(pos) ?? -1;\n    width = current > 0xffff ? 2 : 1;\n\n    return current;\n  };\n\n  // Based on https://www.w3.org/TR/css-syntax-3/#consume-ident-like-token\n  while ((pos = contents.indexOf('url(', pos)) !== -1) {\n    // Set to position of the (\n    pos += 3;\n    width = 1;\n\n    // Consume all leading whitespace\n    while (isWhitespace(next())) {\n      /* empty */\n    }\n\n    // Initialize URL state\n    const url = { start: pos, end: -1, value: '' };\n    let complete = false;\n\n    // If \" or ', then consume the value as a string\n    if (current === 0x0022 || current === 0x0027) {\n      const ending = current;\n      // Based on https://www.w3.org/TR/css-syntax-3/#consume-string-token\n      while (!complete) {\n        switch (next()) {\n          case -1: // EOF\n            return;\n          case 0x000a: // line feed\n          case 0x000c: // form feed\n          case 0x000d: // carriage return\n            // Invalid\n            complete = true;\n            break;\n          case 0x005c: // \\ -- character escape\n            // If not EOF or newline, add the character after the escape\n            switch (next()) {\n              case -1:\n                return;\n              case 0x000a: // line feed\n              case 0x000c: // form feed\n              case 0x000d: // carriage return\n                // Skip when inside a string\n                break;\n              default:\n                // TODO: Handle hex escape codes\n                url.value += String.fromCodePoint(current);\n                break;\n            }\n            break;\n          case ending:\n            // Full string position should include the quotes for replacement\n            url.end = pos + 1;\n            complete = true;\n            yield url;\n            break;\n          default:\n            url.value += String.fromCodePoint(current);\n            break;\n        }\n      }\n\n      next();\n      continue;\n    }\n\n    // Based on https://www.w3.org/TR/css-syntax-3/#consume-url-token\n    while (!complete) {\n      switch (current) {\n        case -1: // EOF\n          return;\n        case 0x0022: // \"\n        case 0x0027: // '\n        case 0x0028: // (\n          // Invalid\n          complete = true;\n          break;\n        case 0x0029: // )\n          // URL is valid and complete\n          url.end = pos;\n          complete = true;\n          break;\n        case 0x005c: // \\ -- character escape\n          // If not EOF or newline, add the character after the escape\n          switch (next()) {\n            case -1: // EOF\n              return;\n            case 0x000a: // line feed\n            case 0x000c: // form feed\n            case 0x000d: // carriage return\n              // Invalid\n              complete = true;\n              break;\n            default:\n              // TODO: Handle hex escape codes\n              url.value += String.fromCodePoint(current);\n              break;\n          }\n          break;\n        default:\n          if (isWhitespace(current)) {\n            while (isWhitespace(next())) {\n              /* empty */\n            }\n            // Unescaped whitespace is only valid before the closing )\n            if (current === 0x0029) {\n              // URL is valid\n              url.end = pos;\n            }\n            complete = true;\n          } else {\n            // Add the character to the url value\n            url.value += String.fromCodePoint(current);\n          }\n          break;\n      }\n      next();\n    }\n\n    // An end position indicates a URL was found\n    if (url.end !== -1) {\n      yield url;\n    }\n  }\n}\n\n/**\n * Scans a CSS or Sass file and locates all valid import/use directive values as defined by the\n * syntax specification.\n * @param contents A string containing a CSS or Sass file to scan.\n * @returns An iterable that yields each CSS directive value found.\n */\nexport function* findImports(\n  contents: string,\n): Iterable<{ start: number; end: number; specifier: string }> {\n  yield* find(contents, '@import ');\n  yield* find(contents, '@use ');\n}\n\n/**\n * Scans a CSS or Sass file and locates all valid function/directive values as defined by the\n * syntax specification.\n * @param contents A string containing a CSS or Sass file to scan.\n * @param prefix The prefix to start a valid segment.\n * @returns An iterable that yields each CSS url function value found.\n */\nfunction* find(\n  contents: string,\n  prefix: string,\n): Iterable<{ start: number; end: number; specifier: string }> {\n  let pos = 0;\n  let width = 1;\n  let current = -1;\n  const next = () => {\n    pos += width;\n    current = contents.codePointAt(pos) ?? -1;\n    width = current > 0xffff ? 2 : 1;\n\n    return current;\n  };\n\n  // Based on https://www.w3.org/TR/css-syntax-3/#consume-ident-like-token\n  while ((pos = contents.indexOf(prefix, pos)) !== -1) {\n    // Set to position of the last character in prefix\n    pos += prefix.length - 1;\n    width = 1;\n\n    // Consume all leading whitespace\n    while (isWhitespace(next())) {\n      /* empty */\n    }\n\n    // Initialize URL state\n    const url = { start: pos, end: -1, specifier: '' };\n    let complete = false;\n\n    // If \" or ', then consume the value as a string\n    if (current === 0x0022 || current === 0x0027) {\n      const ending = current;\n      // Based on https://www.w3.org/TR/css-syntax-3/#consume-string-token\n      while (!complete) {\n        switch (next()) {\n          case -1: // EOF\n            return;\n          case 0x000a: // line feed\n          case 0x000c: // form feed\n          case 0x000d: // carriage return\n            // Invalid\n            complete = true;\n            break;\n          case 0x005c: // \\ -- character escape\n            // If not EOF or newline, add the character after the escape\n            switch (next()) {\n              case -1:\n                return;\n              case 0x000a: // line feed\n              case 0x000c: // form feed\n              case 0x000d: // carriage return\n                // Skip when inside a string\n                break;\n              default:\n                // TODO: Handle hex escape codes\n                url.specifier += String.fromCodePoint(current);\n                break;\n            }\n            break;\n          case ending:\n            // Full string position should include the quotes for replacement\n            url.end = pos + 1;\n            complete = true;\n            yield url;\n            break;\n          default:\n            url.specifier += String.fromCodePoint(current);\n            break;\n        }\n      }\n\n      next();\n      continue;\n    }\n  }\n}\n"]}