refactor: remove unused code from CSS Lexer

This code is no longer used.

packages/angular_devkit/build_angular/src/tools/sass/lexer.ts

@@ -167,101 +167,3 @@ export function* 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.
- */
-export function* findImports(
-  contents: string,
-): Iterable<{ start: number; end: number; specifier: string }> {
-  yield* find(contents, '@import ');
-  yield* find(contents, '@use ');
-}
-
-/**
- * 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: string,
-  prefix: string,
-): Iterable<{ start: number; end: number; specifier: string }> {
-  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;
-    }
-  }
-}