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app_vue/node_modules/@babel/plugin-transform-block-scoping/lib/loop.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getLoopBodyBindings = getLoopBodyBindings;
+exports.getUsageInBody = getUsageInBody;
+exports.isVarInLoopHead = isVarInLoopHead;
+exports.wrapLoopBody = wrapLoopBody;
+var _core = require("@babel/core");
+const collectLoopBodyBindingsVisitor = {
+  "Expression|Declaration|Loop"(path) {
+    path.skip();
+  },
+  Scope(path, state) {
+    if (path.isFunctionParent()) path.skip();
+    const {
+      bindings
+    } = path.scope;
+    for (const name of Object.keys(bindings)) {
+      const binding = bindings[name];
+      if (binding.kind === "let" || binding.kind === "const" || binding.kind === "hoisted") {
+        state.blockScoped.push(binding);
+      }
+    }
+  }
+};
+function getLoopBodyBindings(loopPath) {
+  const state = {
+    blockScoped: []
+  };
+  loopPath.traverse(collectLoopBodyBindingsVisitor, state);
+  return state.blockScoped;
+}
+function getUsageInBody(binding, loopPath) {
+  const seen = new WeakSet();
+  let capturedInClosure = false;
+  const constantViolations = filterMap(binding.constantViolations, path => {
+    const {
+      inBody,
+      inClosure
+    } = relativeLoopLocation(path, loopPath);
+    if (!inBody) return null;
+    capturedInClosure || (capturedInClosure = inClosure);
+    const id = path.isUpdateExpression() ? path.get("argument") : path.isAssignmentExpression() ? path.get("left") : null;
+    if (id) seen.add(id.node);
+    return id;
+  });
+  const references = filterMap(binding.referencePaths, path => {
+    if (seen.has(path.node)) return null;
+    const {
+      inBody,
+      inClosure
+    } = relativeLoopLocation(path, loopPath);
+    if (!inBody) return null;
+    capturedInClosure || (capturedInClosure = inClosure);
+    return path;
+  });
+  return {
+    capturedInClosure,
+    hasConstantViolations: constantViolations.length > 0,
+    usages: references.concat(constantViolations)
+  };
+}
+function relativeLoopLocation(path, loopPath) {
+  const bodyPath = loopPath.get("body");
+  let inClosure = false;
+  for (let currPath = path; currPath; currPath = currPath.parentPath) {
+    if (currPath.isFunction() || currPath.isClass() || currPath.isMethod()) {
+      inClosure = true;
+    }
+    if (currPath === bodyPath) {
+      return {
+        inBody: true,
+        inClosure
+      };
+    } else if (currPath === loopPath) {
+      return {
+        inBody: false,
+        inClosure
+      };
+    }
+  }
+  throw new Error("Internal Babel error: path is not in loop. Please report this as a bug.");
+}
+const collectCompletionsAndVarsVisitor = {
+  Function(path) {
+    path.skip();
+  },
+  LabeledStatement: {
+    enter({
+      node
+    }, state) {
+      state.labelsStack.push(node.label.name);
+    },
+    exit({
+      node
+    }, state) {
+      const popped = state.labelsStack.pop();
+      if (popped !== node.label.name) {
+        throw new Error("Assertion failure. Please report this bug to Babel.");
+      }
+    }
+  },
+  Loop: {
+    enter(_, state) {
+      state.labellessContinueTargets++;
+      state.labellessBreakTargets++;
+    },
+    exit(_, state) {
+      state.labellessContinueTargets--;
+      state.labellessBreakTargets--;
+    }
+  },
+  SwitchStatement: {
+    enter(_, state) {
+      state.labellessBreakTargets++;
+    },
+    exit(_, state) {
+      state.labellessBreakTargets--;
+    }
+  },
+  "BreakStatement|ContinueStatement"(path, state) {
+    const {
+      label
+    } = path.node;
+    if (label) {
+      if (state.labelsStack.includes(label.name)) return;
+    } else if (path.isBreakStatement() ? state.labellessBreakTargets > 0 : state.labellessContinueTargets > 0) {
+      return;
+    }
+    state.breaksContinues.push(path);
+  },
+  ReturnStatement(path, state) {
+    state.returns.push(path);
+  },
+  VariableDeclaration(path, state) {
+    if (path.parent === state.loopNode && isVarInLoopHead(path)) return;
+    if (path.node.kind === "var") state.vars.push(path);
+  }
+};
+function wrapLoopBody(loopPath, captured, updatedBindingsUsages) {
+  const loopNode = loopPath.node;
+  const state = {
+    breaksContinues: [],
+    returns: [],
+    labelsStack: [],
+    labellessBreakTargets: 0,
+    labellessContinueTargets: 0,
+    vars: [],
+    loopNode
+  };
+  loopPath.traverse(collectCompletionsAndVarsVisitor, state);
+  const callArgs = [];
+  const closureParams = [];
+  const updater = [];
+  for (const [name, updatedUsage] of updatedBindingsUsages) {
+    callArgs.push(_core.types.identifier(name));
+    const innerName = loopPath.scope.generateUid(name);
+    closureParams.push(_core.types.identifier(innerName));
+    updater.push(_core.types.assignmentExpression("=", _core.types.identifier(name), _core.types.identifier(innerName)));
+    for (const path of updatedUsage) path.replaceWith(_core.types.identifier(innerName));
+  }
+  for (const name of captured) {
+    if (updatedBindingsUsages.has(name)) continue;
+    callArgs.push(_core.types.identifier(name));
+    closureParams.push(_core.types.identifier(name));
+  }
+  const id = loopPath.scope.generateUid("loop");
+  const fn = _core.types.functionExpression(null, closureParams, _core.types.toBlock(loopNode.body));
+  let call = _core.types.callExpression(_core.types.identifier(id), callArgs);
+  const fnParent = loopPath.findParent(p => p.isFunction());
+  if (fnParent) {
+    const {
+      async,
+      generator
+    } = fnParent.node;
+    fn.async = async;
+    fn.generator = generator;
+    if (generator) call = _core.types.yieldExpression(call, true);else if (async) call = _core.types.awaitExpression(call);
+  }
+  const updaterNode = updater.length > 0 ? _core.types.expressionStatement(_core.types.sequenceExpression(updater)) : null;
+  if (updaterNode) fn.body.body.push(updaterNode);
+  const [varPath] = loopPath.insertBefore(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(_core.types.identifier(id), fn)]));
+  const bodyStmts = [];
+  const varNames = [];
+  for (const varPath of state.vars) {
+    const assign = [];
+    for (const decl of varPath.node.declarations) {
+      varNames.push(...Object.keys(_core.types.getBindingIdentifiers(decl.id)));
+      if (decl.init) {
+        assign.push(_core.types.assignmentExpression("=", decl.id, decl.init));
+      } else if (_core.types.isForXStatement(varPath.parent, {
+        left: varPath.node
+      })) {
+        assign.push(decl.id);
+      }
+    }
+    if (assign.length > 0) {
+      const replacement = assign.length === 1 ? assign[0] : _core.types.sequenceExpression(assign);
+      varPath.replaceWith(replacement);
+    } else {
+      varPath.remove();
+    }
+  }
+  if (varNames.length) {
+    varPath.pushContainer("declarations", varNames.map(name => _core.types.variableDeclarator(_core.types.identifier(name))));
+  }
+  const labelNum = state.breaksContinues.length;
+  const returnNum = state.returns.length;
+  if (labelNum + returnNum === 0) {
+    bodyStmts.push(_core.types.expressionStatement(call));
+  } else if (labelNum === 1 && returnNum === 0) {
+    for (const path of state.breaksContinues) {
+      const {
+        node
+      } = path;
+      const {
+        type,
+        label
+      } = node;
+      let name = type === "BreakStatement" ? "break" : "continue";
+      if (label) name += " " + label.name;
+      path.replaceWith(_core.types.addComment(_core.types.returnStatement(_core.types.numericLiteral(1)), "trailing", " " + name, true));
+      if (updaterNode) path.insertBefore(_core.types.cloneNode(updaterNode));
+      bodyStmts.push(_core.template.statement.ast`
+        if (${call}) ${node}
+      `);
+    }
+  } else {
+    const completionId = loopPath.scope.generateUid("ret");
+    if (varPath.isVariableDeclaration()) {
+      varPath.pushContainer("declarations", [_core.types.variableDeclarator(_core.types.identifier(completionId))]);
+      bodyStmts.push(_core.types.expressionStatement(_core.types.assignmentExpression("=", _core.types.identifier(completionId), call)));
+    } else {
+      bodyStmts.push(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(_core.types.identifier(completionId), call)]));
+    }
+    const injected = [];
+    for (const path of state.breaksContinues) {
+      const {
+        node
+      } = path;
+      const {
+        type,
+        label
+      } = node;
+      let name = type === "BreakStatement" ? "break" : "continue";
+      if (label) name += " " + label.name;
+      let i = injected.indexOf(name);
+      const hasInjected = i !== -1;
+      if (!hasInjected) {
+        injected.push(name);
+        i = injected.length - 1;
+      }
+      path.replaceWith(_core.types.addComment(_core.types.returnStatement(_core.types.numericLiteral(i)), "trailing", " " + name, true));
+      if (updaterNode) path.insertBefore(_core.types.cloneNode(updaterNode));
+      if (hasInjected) continue;
+      bodyStmts.push(_core.template.statement.ast`
+        if (${_core.types.identifier(completionId)} === ${_core.types.numericLiteral(i)}) ${node}
+      `);
+    }
+    if (returnNum) {
+      for (const path of state.returns) {
+        const arg = path.node.argument || path.scope.buildUndefinedNode();
+        path.replaceWith(_core.template.statement.ast`
+          return { v: ${arg} };
+        `);
+      }
+      bodyStmts.push(_core.template.statement.ast`
+          if (${_core.types.identifier(completionId)}) return ${_core.types.identifier(completionId)}.v;
+        `);
+    }
+  }
+  loopNode.body = _core.types.blockStatement(bodyStmts);
+  return varPath;
+}
+function isVarInLoopHead(path) {
+  if (_core.types.isForStatement(path.parent)) return path.key === "init";
+  if (_core.types.isForXStatement(path.parent)) return path.key === "left";
+  return false;
+}
+function filterMap(list, fn) {
+  const result = [];
+  for (const item of list) {
+    const mapped = fn(item);
+    if (mapped) result.push(mapped);
+  }
+  return result;
+}
+
+//# sourceMappingURL=loop.js.map