项目初始化

sheep/router/utils/strip-json-comments.js

@@ -0,0 +1,79 @@
+const singleComment = Symbol('singleComment');
+const multiComment = Symbol('multiComment');
+
+const stripWithoutWhitespace = () => '';
+const stripWithWhitespace = (string, start, end) => string.slice(start, end).replace(/\S/g, ' ');
+
+const isEscaped = (jsonString, quotePosition) => {
+  let index = quotePosition - 1;
+  let backslashCount = 0;
+
+  while (jsonString[index] === '\\') {
+    index -= 1;
+    backslashCount += 1;
+  }
+
+  return Boolean(backslashCount % 2);
+};
+
+export default function stripJsonComments(jsonString, { whitespace = true } = {}) {
+  if (typeof jsonString !== 'string') {
+    throw new TypeError(
+      `Expected argument \`jsonString\` to be a \`string\`, got \`${typeof jsonString}\``,
+    );
+  }
+
+  const strip = whitespace ? stripWithWhitespace : stripWithoutWhitespace;
+
+  let isInsideString = false;
+  let isInsideComment = false;
+  let offset = 0;
+  let result = '';
+
+  for (let index = 0; index < jsonString.length; index++) {
+    const currentCharacter = jsonString[index];
+    const nextCharacter = jsonString[index + 1];
+
+    if (!isInsideComment && currentCharacter === '"') {
+      const escaped = isEscaped(jsonString, index);
+      if (!escaped) {
+        isInsideString = !isInsideString;
+      }
+    }
+
+    if (isInsideString) {
+      continue;
+    }
+
+    if (!isInsideComment && currentCharacter + nextCharacter === '//') {
+      result += jsonString.slice(offset, index);
+      offset = index;
+      isInsideComment = singleComment;
+      index++;
+    } else if (isInsideComment === singleComment && currentCharacter + nextCharacter === '\r\n') {
+      index++;
+      isInsideComment = false;
+      result += strip(jsonString, offset, index);
+      offset = index;
+      continue;
+    } else if (isInsideComment === singleComment && currentCharacter === '\n') {
+      isInsideComment = false;
+      result += strip(jsonString, offset, index);
+      offset = index;
+    } else if (!isInsideComment && currentCharacter + nextCharacter === '/*') {
+      result += jsonString.slice(offset, index);
+      offset = index;
+      isInsideComment = multiComment;
+      index++;
+      continue;
+    } else if (isInsideComment === multiComment && currentCharacter + nextCharacter === '*/') {
+      index++;
+      isInsideComment = false;
+      result += strip(jsonString, offset, index + 1);
+      offset = index + 1;
+      continue;
+    }
+  }
+
+  return result + (isInsideComment ? strip(jsonString.slice(offset)) : jsonString.slice(offset));
+}