| 1 |
- {"version":3,"names":["util","require","hasOwn","Object","prototype","hasOwnProperty","hoist","funPath","t","getTypes","assertFunction","node","vars","varDeclToExpr","vdec","scope","includeIdentifiers","assertVariableDeclaration","exprs","declarations","forEach","dec","id","name","identifier","removeBinding","init","push","assignmentExpression","length","sequenceExpression","get","traverse","VariableDeclaration","exit","path","expr","remove","replaceWithOrRemove","expressionStatement","skip","ForStatement","isVariableDeclaration","ForXStatement","left","FunctionDeclaration","assignment","clone","functionExpression","generateUidIdentifierBasedOnNode","params","body","generator","expression","parentPath","isBlockStatement","unshiftContainer","FunctionExpression","ArrowFunctionExpression","paramNames","paramPath","param","isIdentifier","keys","call","variableDeclarator","variableDeclaration"],"sources":["../../src/regenerator/hoist.ts"],"sourcesContent":["import * as util from \"./util.ts\";\nconst hasOwn = Object.prototype.hasOwnProperty;\n\n// The hoist function takes a FunctionExpression or FunctionDeclaration\n// and replaces any Declaration nodes in its body with assignments, then\n// returns a VariableDeclaration containing just the names of the removed\n// declarations.\nexport function hoist(funPath: any) {\n const t = util.getTypes();\n t.assertFunction(funPath.node);\n\n const vars: Record<string, any> = {};\n\n function varDeclToExpr({ node: vdec, scope }: any, includeIdentifiers: any) {\n t.assertVariableDeclaration(vdec);\n // TODO assert.equal(vdec.kind, \"var\");\n const exprs: any[] = [];\n\n vdec.declarations.forEach(function (dec: any) {\n // Note: We duplicate 'dec.id' here to ensure that the variable declaration IDs don't\n // have the same 'loc' value, since that can make sourcemaps and retainLines behave poorly.\n vars[dec.id.name] = t.identifier(dec.id.name);\n\n // Remove the binding, to avoid \"duplicate declaration\" errors when it will\n // be injected again.\n scope.removeBinding(dec.id.name);\n\n if (dec.init) {\n exprs.push(t.assignmentExpression(\"=\", dec.id, dec.init));\n } else if (includeIdentifiers) {\n exprs.push(dec.id);\n }\n });\n\n if (exprs.length === 0) return null;\n\n if (exprs.length === 1) return exprs[0];\n\n return t.sequenceExpression(exprs);\n }\n\n funPath.get(\"body\").traverse({\n VariableDeclaration: {\n exit: function (path: any) {\n const expr = varDeclToExpr(path, false);\n if (expr === null) {\n path.remove();\n } else {\n // We don't need to traverse this expression any further because\n // there can't be any new declarations inside an expression.\n util.replaceWithOrRemove(path, t.expressionStatement(expr));\n }\n\n // Since the original node has been either removed or replaced,\n // avoid traversing it any further.\n path.skip();\n },\n },\n\n ForStatement: function (path: any) {\n const init = path.get(\"init\");\n if (init.isVariableDeclaration()) {\n util.replaceWithOrRemove(init, varDeclToExpr(init, false));\n }\n },\n\n ForXStatement: function (path: any) {\n const left = path.get(\"left\");\n if (left.isVariableDeclaration()) {\n util.replaceWithOrRemove(left, varDeclToExpr(left, true));\n }\n },\n\n FunctionDeclaration: function (path: any) {\n const node = path.node;\n vars[node.id.name] = node.id;\n\n const assignment = t.expressionStatement(\n t.assignmentExpression(\n \"=\",\n t.clone(node.id),\n t.functionExpression(\n path.scope.generateUidIdentifierBasedOnNode(node),\n node.params,\n node.body,\n node.generator,\n node.expression,\n ),\n ),\n );\n\n if (path.parentPath.isBlockStatement()) {\n // Insert the assignment form before the first statement in the\n // enclosing block.\n path.parentPath.unshiftContainer(\"body\", assignment);\n\n // Remove the function declaration now that we've inserted the\n // equivalent assignment form at the beginning of the block.\n path.remove();\n } else {\n // If the parent node is not a block statement, then we can just\n // replace the declaration with the equivalent assignment form\n // without worrying about hoisting it.\n util.replaceWithOrRemove(path, assignment);\n }\n\n // Remove the binding, to avoid \"duplicate declaration\" errors when it will\n // be injected again.\n path.scope.removeBinding(node.id.name);\n\n // Don't hoist variables out of inner functions.\n path.skip();\n },\n\n FunctionExpression: function (path: any) {\n // Don't descend into nested function expressions.\n path.skip();\n },\n\n ArrowFunctionExpression: function (path: any) {\n // Don't descend into nested function expressions.\n path.skip();\n },\n });\n\n const paramNames: Record<string, any> = {};\n funPath.get(\"params\").forEach(function (paramPath: any) {\n const param = paramPath.node;\n if (t.isIdentifier(param)) {\n paramNames[param.name] = param;\n } else {\n // Variables declared by destructuring parameter patterns will be\n // harmlessly re-declared.\n }\n });\n\n const 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