add hw2

node_modules/sucrase/dist/transformers/ReactDisplayNameTransformer.js

@@ -0,0 +1,160 @@
+"use strict";Object.defineProperty(exports, "__esModule", {value: true}); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var _tokenizer = require('../parser/tokenizer');
+var _types = require('../parser/tokenizer/types');
+
+
+var _Transformer = require('./Transformer'); var _Transformer2 = _interopRequireDefault(_Transformer);
+
+/**
+ * Implementation of babel-plugin-transform-react-display-name, which adds a
+ * display name to usages of React.createClass and createReactClass.
+ */
+ class ReactDisplayNameTransformer extends _Transformer2.default {
+  constructor(
+     rootTransformer,
+     tokens,
+     importProcessor,
+     options,
+  ) {
+    super();this.rootTransformer = rootTransformer;this.tokens = tokens;this.importProcessor = importProcessor;this.options = options;;
+  }
+
+  process() {
+    const startIndex = this.tokens.currentIndex();
+    if (this.tokens.identifierName() === "createReactClass") {
+      const newName =
+        this.importProcessor && this.importProcessor.getIdentifierReplacement("createReactClass");
+      if (newName) {
+        this.tokens.replaceToken(`(0, ${newName})`);
+      } else {
+        this.tokens.copyToken();
+      }
+      this.tryProcessCreateClassCall(startIndex);
+      return true;
+    }
+    if (
+      this.tokens.matches3(_types.TokenType.name, _types.TokenType.dot, _types.TokenType.name) &&
+      this.tokens.identifierName() === "React" &&
+      this.tokens.identifierNameAtIndex(this.tokens.currentIndex() + 2) === "createClass"
+    ) {
+      const newName = this.importProcessor
+        ? this.importProcessor.getIdentifierReplacement("React") || "React"
+        : "React";
+      if (newName) {
+        this.tokens.replaceToken(newName);
+        this.tokens.copyToken();
+        this.tokens.copyToken();
+      } else {
+        this.tokens.copyToken();
+        this.tokens.copyToken();
+        this.tokens.copyToken();
+      }
+      this.tryProcessCreateClassCall(startIndex);
+      return true;
+    }
+    return false;
+  }
+
+  /**
+   * This is called with the token position at the open-paren.
+   */
+   tryProcessCreateClassCall(startIndex) {
+    const displayName = this.findDisplayName(startIndex);
+    if (!displayName) {
+      return;
+    }
+
+    if (this.classNeedsDisplayName()) {
+      this.tokens.copyExpectedToken(_types.TokenType.parenL);
+      this.tokens.copyExpectedToken(_types.TokenType.braceL);
+      this.tokens.appendCode(`displayName: '${displayName}',`);
+      this.rootTransformer.processBalancedCode();
+      this.tokens.copyExpectedToken(_types.TokenType.braceR);
+      this.tokens.copyExpectedToken(_types.TokenType.parenR);
+    }
+  }
+
+   findDisplayName(startIndex) {
+    if (startIndex < 2) {
+      return null;
+    }
+    if (this.tokens.matches2AtIndex(startIndex - 2, _types.TokenType.name, _types.TokenType.eq)) {
+      // This is an assignment (or declaration) and the LHS is either an identifier or a member
+      // expression ending in an identifier, so use that identifier name.
+      return this.tokens.identifierNameAtIndex(startIndex - 2);
+    }
+    if (
+      startIndex >= 2 &&
+      this.tokens.tokens[startIndex - 2].identifierRole === _tokenizer.IdentifierRole.ObjectKey
+    ) {
+      // This is an object literal value.
+      return this.tokens.identifierNameAtIndex(startIndex - 2);
+    }
+    if (this.tokens.matches2AtIndex(startIndex - 2, _types.TokenType._export, _types.TokenType._default)) {
+      return this.getDisplayNameFromFilename();
+    }
+    return null;
+  }
+
+   getDisplayNameFromFilename() {
+    const filePath = this.options.filePath || "unknown";
+    const pathSegments = filePath.split("/");
+    const filename = pathSegments[pathSegments.length - 1];
+    const dotIndex = filename.lastIndexOf(".");
+    const baseFilename = dotIndex === -1 ? filename : filename.slice(0, dotIndex);
+    if (baseFilename === "index" && pathSegments[pathSegments.length - 2]) {
+      return pathSegments[pathSegments.length - 2];
+    } else {
+      return baseFilename;
+    }
+  }
+
+  /**
+   * We only want to add a display name when this is a function call containing
+   * one argument, which is an object literal without `displayName` as an
+   * existing key.
+   */
+   classNeedsDisplayName() {
+    let index = this.tokens.currentIndex();
+    if (!this.tokens.matches2(_types.TokenType.parenL, _types.TokenType.braceL)) {
+      return false;
+    }
+    // The block starts on the {, and we expect any displayName key to be in
+    // that context. We need to ignore other other contexts to avoid matching
+    // nested displayName keys.
+    const objectStartIndex = index + 1;
+    const objectContextId = this.tokens.tokens[objectStartIndex].contextId;
+    if (objectContextId == null) {
+      throw new Error("Expected non-null context ID on object open-brace.");
+    }
+
+    for (; index < this.tokens.tokens.length; index++) {
+      const token = this.tokens.tokens[index];
+      if (token.type === _types.TokenType.braceR && token.contextId === objectContextId) {
+        index++;
+        break;
+      }
+
+      if (
+        this.tokens.identifierNameAtIndex(index) === "displayName" &&
+        this.tokens.tokens[index].identifierRole === _tokenizer.IdentifierRole.ObjectKey &&
+        token.contextId === objectContextId
+      ) {
+        // We found a displayName key, so bail out.
+        return false;
+      }
+    }
+
+    if (index === this.tokens.tokens.length) {
+      throw new Error("Unexpected end of input when processing React class.");
+    }
+
+    // If we got this far, we know we have createClass with an object with no
+    // display name, so we want to proceed as long as that was the only argument.
+    return (
+      this.tokens.matches1AtIndex(index, _types.TokenType.parenR) ||
+      this.tokens.matches2AtIndex(index, _types.TokenType.comma, _types.TokenType.parenR)
+    );
+  }
+} exports.default = ReactDisplayNameTransformer;