1171 lines
29 KiB
JavaScript
1171 lines
29 KiB
JavaScript
/* eslint max-len: 0 */
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import {File} from "../index";
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import {
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flowAfterParseClassSuper,
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flowAfterParseVarHead,
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flowParseExportDeclaration,
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flowParseExportStar,
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flowParseIdentifierStatement,
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flowParseImportSpecifier,
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flowParseTypeAnnotation,
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flowParseTypeParameterDeclaration,
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flowShouldDisallowExportDefaultSpecifier,
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flowShouldParseExportDeclaration,
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flowShouldParseExportStar,
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flowStartParseFunctionParams,
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flowStartParseImportSpecifiers,
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flowTryParseStatement,
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} from "../plugins/flow";
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import {
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tsAfterParseClassSuper,
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tsAfterParseVarHead,
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tsIsDeclarationStart,
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tsParseExportDeclaration,
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tsParseIdentifierStatement,
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tsParseImportEqualsDeclaration,
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tsParseMaybeDecoratorArguments,
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tsParseModifiers,
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tsStartParseFunctionParams,
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tsTryParseClassMemberWithIsStatic,
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tsTryParseExport,
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tsTryParseExportDefaultExpression,
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tsTryParseStatementContent,
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tsTryParseTypeAnnotation,
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tsTryParseTypeParameters,
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} from "../plugins/typescript";
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import {
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eat,
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IdentifierRole,
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lookaheadType,
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lookaheadTypeAndKeyword,
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match,
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next,
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nextTokenStart,
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nextTokenStartSince,
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popTypeContext,
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pushTypeContext,
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} from "../tokenizer";
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import {ContextualKeyword} from "../tokenizer/keywords";
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import {Scope} from "../tokenizer/state";
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import { TokenType as tt} from "../tokenizer/types";
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import {charCodes} from "../util/charcodes";
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import {getNextContextId, input, isFlowEnabled, isTypeScriptEnabled, state} from "./base";
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import {
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parseCallExpressionArguments,
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parseExprAtom,
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parseExpression,
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parseExprSubscripts,
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parseFunctionBodyAndFinish,
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parseIdentifier,
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parseMaybeAssign,
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parseMethod,
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parseParenExpression,
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parsePropertyName,
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} from "./expression";
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import {
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parseBindingAtom,
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parseBindingIdentifier,
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parseBindingList,
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parseImportedIdentifier,
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} from "./lval";
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import {
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canInsertSemicolon,
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eatContextual,
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expect,
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expectContextual,
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isContextual,
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isLineTerminator,
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semicolon,
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unexpected,
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} from "./util";
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export function parseTopLevel() {
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parseBlockBody(tt.eof);
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state.scopes.push(new Scope(0, state.tokens.length, true));
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if (state.scopeDepth !== 0) {
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throw new Error(`Invalid scope depth at end of file: ${state.scopeDepth}`);
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}
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return new File(state.tokens, state.scopes);
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}
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// Parse a single statement.
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//
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// If expecting a statement and finding a slash operator, parse a
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// regular expression literal. This is to handle cases like
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// `if (foo) /blah/.exec(foo)`, where looking at the previous token
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// does not help.
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export function parseStatement(declaration) {
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if (isFlowEnabled) {
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if (flowTryParseStatement()) {
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return;
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}
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}
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if (match(tt.at)) {
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parseDecorators();
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}
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parseStatementContent(declaration);
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}
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function parseStatementContent(declaration) {
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if (isTypeScriptEnabled) {
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if (tsTryParseStatementContent()) {
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return;
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}
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}
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const starttype = state.type;
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// Most types of statements are recognized by the keyword they
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// start with. Many are trivial to parse, some require a bit of
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// complexity.
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switch (starttype) {
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case tt._break:
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case tt._continue:
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parseBreakContinueStatement();
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return;
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case tt._debugger:
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parseDebuggerStatement();
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return;
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case tt._do:
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parseDoStatement();
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return;
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case tt._for:
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parseForStatement();
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return;
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case tt._function:
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if (lookaheadType() === tt.dot) break;
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if (!declaration) unexpected();
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parseFunctionStatement();
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return;
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case tt._class:
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if (!declaration) unexpected();
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parseClass(true);
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return;
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case tt._if:
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parseIfStatement();
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return;
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case tt._return:
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parseReturnStatement();
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return;
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case tt._switch:
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parseSwitchStatement();
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return;
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case tt._throw:
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parseThrowStatement();
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return;
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case tt._try:
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parseTryStatement();
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return;
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case tt._let:
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case tt._const:
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if (!declaration) unexpected(); // NOTE: falls through to _var
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case tt._var:
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parseVarStatement(starttype);
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return;
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case tt._while:
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parseWhileStatement();
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return;
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case tt.braceL:
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parseBlock();
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return;
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case tt.semi:
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parseEmptyStatement();
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return;
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case tt._export:
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case tt._import: {
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const nextType = lookaheadType();
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if (nextType === tt.parenL || nextType === tt.dot) {
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break;
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}
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next();
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if (starttype === tt._import) {
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parseImport();
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} else {
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parseExport();
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}
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return;
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}
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case tt.name:
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if (state.contextualKeyword === ContextualKeyword._async) {
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const functionStart = state.start;
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// peek ahead and see if next token is a function
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const snapshot = state.snapshot();
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next();
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if (match(tt._function) && !canInsertSemicolon()) {
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expect(tt._function);
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parseFunction(functionStart, true);
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return;
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} else {
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state.restoreFromSnapshot(snapshot);
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}
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}
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default:
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// Do nothing.
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break;
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}
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// If the statement does not start with a statement keyword or a
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// brace, it's an ExpressionStatement or LabeledStatement. We
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// simply start parsing an expression, and afterwards, if the
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// next token is a colon and the expression was a simple
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// Identifier node, we switch to interpreting it as a label.
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const initialTokensLength = state.tokens.length;
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parseExpression();
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let simpleName = null;
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if (state.tokens.length === initialTokensLength + 1) {
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const token = state.tokens[state.tokens.length - 1];
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if (token.type === tt.name) {
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simpleName = token.contextualKeyword;
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}
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}
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if (simpleName == null) {
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semicolon();
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return;
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}
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if (eat(tt.colon)) {
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parseLabeledStatement();
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} else {
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// This was an identifier, so we might want to handle flow/typescript-specific cases.
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parseIdentifierStatement(simpleName);
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}
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}
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export function parseDecorators() {
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while (match(tt.at)) {
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parseDecorator();
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}
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}
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function parseDecorator() {
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next();
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if (eat(tt.parenL)) {
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parseExpression();
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expect(tt.parenR);
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} else {
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parseIdentifier();
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while (eat(tt.dot)) {
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parseIdentifier();
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}
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}
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parseMaybeDecoratorArguments();
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}
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function parseMaybeDecoratorArguments() {
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if (isTypeScriptEnabled) {
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tsParseMaybeDecoratorArguments();
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} else {
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baseParseMaybeDecoratorArguments();
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}
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}
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export function baseParseMaybeDecoratorArguments() {
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if (eat(tt.parenL)) {
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parseCallExpressionArguments();
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}
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}
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function parseBreakContinueStatement() {
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next();
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if (!isLineTerminator()) {
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parseIdentifier();
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semicolon();
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}
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}
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function parseDebuggerStatement() {
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next();
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semicolon();
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}
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function parseDoStatement() {
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next();
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parseStatement(false);
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expect(tt._while);
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parseParenExpression();
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eat(tt.semi);
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}
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function parseForStatement() {
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state.scopeDepth++;
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const startTokenIndex = state.tokens.length;
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parseAmbiguousForStatement();
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const endTokenIndex = state.tokens.length;
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state.scopes.push(new Scope(startTokenIndex, endTokenIndex, false));
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state.scopeDepth--;
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}
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// Disambiguating between a `for` and a `for`/`in` or `for`/`of`
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// loop is non-trivial. Basically, we have to parse the init `var`
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// statement or expression, disallowing the `in` operator (see
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// the second parameter to `parseExpression`), and then check
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// whether the next token is `in` or `of`. When there is no init
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// part (semicolon immediately after the opening parenthesis), it
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// is a regular `for` loop.
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function parseAmbiguousForStatement() {
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next();
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let forAwait = false;
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if (isContextual(ContextualKeyword._await)) {
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forAwait = true;
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next();
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}
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expect(tt.parenL);
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if (match(tt.semi)) {
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if (forAwait) {
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unexpected();
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}
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parseFor();
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return;
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}
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if (match(tt._var) || match(tt._let) || match(tt._const)) {
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const varKind = state.type;
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next();
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parseVar(true, varKind);
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if (match(tt._in) || isContextual(ContextualKeyword._of)) {
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parseForIn(forAwait);
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return;
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}
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parseFor();
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return;
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}
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parseExpression(true);
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if (match(tt._in) || isContextual(ContextualKeyword._of)) {
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parseForIn(forAwait);
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return;
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}
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if (forAwait) {
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unexpected();
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}
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parseFor();
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}
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function parseFunctionStatement() {
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const functionStart = state.start;
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next();
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parseFunction(functionStart, true);
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}
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function parseIfStatement() {
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next();
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parseParenExpression();
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parseStatement(false);
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if (eat(tt._else)) {
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parseStatement(false);
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}
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}
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function parseReturnStatement() {
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next();
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// In `return` (and `break`/`continue`), the keywords with
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// optional arguments, we eagerly look for a semicolon or the
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// possibility to insert one.
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if (!isLineTerminator()) {
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parseExpression();
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semicolon();
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}
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}
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function parseSwitchStatement() {
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next();
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parseParenExpression();
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state.scopeDepth++;
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const startTokenIndex = state.tokens.length;
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expect(tt.braceL);
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// Don't bother validation; just go through any sequence of cases, defaults, and statements.
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while (!match(tt.braceR) && !state.error) {
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if (match(tt._case) || match(tt._default)) {
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const isCase = match(tt._case);
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next();
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if (isCase) {
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parseExpression();
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}
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expect(tt.colon);
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} else {
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parseStatement(true);
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}
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}
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next(); // Closing brace
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const endTokenIndex = state.tokens.length;
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state.scopes.push(new Scope(startTokenIndex, endTokenIndex, false));
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state.scopeDepth--;
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}
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function parseThrowStatement() {
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next();
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parseExpression();
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semicolon();
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}
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function parseCatchClauseParam() {
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parseBindingAtom(true /* isBlockScope */);
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if (isTypeScriptEnabled) {
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tsTryParseTypeAnnotation();
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}
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}
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function parseTryStatement() {
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next();
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parseBlock();
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if (match(tt._catch)) {
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next();
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let catchBindingStartTokenIndex = null;
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if (match(tt.parenL)) {
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state.scopeDepth++;
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catchBindingStartTokenIndex = state.tokens.length;
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expect(tt.parenL);
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parseCatchClauseParam();
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expect(tt.parenR);
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}
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parseBlock();
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if (catchBindingStartTokenIndex != null) {
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// We need a special scope for the catch binding which includes the binding itself and the
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// catch block.
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const endTokenIndex = state.tokens.length;
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state.scopes.push(new Scope(catchBindingStartTokenIndex, endTokenIndex, false));
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state.scopeDepth--;
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}
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}
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if (eat(tt._finally)) {
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parseBlock();
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}
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}
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export function parseVarStatement(kind) {
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next();
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parseVar(false, kind);
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semicolon();
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}
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function parseWhileStatement() {
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next();
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parseParenExpression();
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parseStatement(false);
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}
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function parseEmptyStatement() {
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next();
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}
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function parseLabeledStatement() {
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parseStatement(true);
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}
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/**
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* Parse a statement starting with an identifier of the given name. Subclasses match on the name
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* to handle statements like "declare".
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*/
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function parseIdentifierStatement(contextualKeyword) {
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if (isTypeScriptEnabled) {
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tsParseIdentifierStatement(contextualKeyword);
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} else if (isFlowEnabled) {
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flowParseIdentifierStatement(contextualKeyword);
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} else {
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semicolon();
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}
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}
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// Parse a semicolon-enclosed block of statements.
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export function parseBlock(isFunctionScope = false, contextId = 0) {
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const startTokenIndex = state.tokens.length;
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state.scopeDepth++;
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expect(tt.braceL);
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if (contextId) {
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state.tokens[state.tokens.length - 1].contextId = contextId;
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}
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parseBlockBody(tt.braceR);
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if (contextId) {
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state.tokens[state.tokens.length - 1].contextId = contextId;
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}
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const endTokenIndex = state.tokens.length;
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state.scopes.push(new Scope(startTokenIndex, endTokenIndex, isFunctionScope));
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state.scopeDepth--;
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}
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export function parseBlockBody(end) {
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while (!eat(end) && !state.error) {
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parseStatement(true);
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}
|
|
}
|
|
|
|
// Parse a regular `for` loop. The disambiguation code in
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// `parseStatement` will already have parsed the init statement or
|
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// expression.
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function parseFor() {
|
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expect(tt.semi);
|
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if (!match(tt.semi)) {
|
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parseExpression();
|
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}
|
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expect(tt.semi);
|
|
if (!match(tt.parenR)) {
|
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parseExpression();
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}
|
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expect(tt.parenR);
|
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parseStatement(false);
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|
}
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|
|
|
// Parse a `for`/`in` and `for`/`of` loop, which are almost
|
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// same from parser's perspective.
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|
|
|
function parseForIn(forAwait) {
|
|
if (forAwait) {
|
|
eatContextual(ContextualKeyword._of);
|
|
} else {
|
|
next();
|
|
}
|
|
parseExpression();
|
|
expect(tt.parenR);
|
|
parseStatement(false);
|
|
}
|
|
|
|
// Parse a list of variable declarations.
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|
|
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function parseVar(isFor, kind) {
|
|
while (true) {
|
|
const isBlockScope = kind === tt._const || kind === tt._let;
|
|
parseVarHead(isBlockScope);
|
|
if (eat(tt.eq)) {
|
|
const eqIndex = state.tokens.length - 1;
|
|
parseMaybeAssign(isFor);
|
|
state.tokens[eqIndex].rhsEndIndex = state.tokens.length;
|
|
}
|
|
if (!eat(tt.comma)) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
function parseVarHead(isBlockScope) {
|
|
parseBindingAtom(isBlockScope);
|
|
if (isTypeScriptEnabled) {
|
|
tsAfterParseVarHead();
|
|
} else if (isFlowEnabled) {
|
|
flowAfterParseVarHead();
|
|
}
|
|
}
|
|
|
|
// Parse a function declaration or literal (depending on the
|
|
// `isStatement` parameter).
|
|
|
|
export function parseFunction(
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|
functionStart,
|
|
isStatement,
|
|
optionalId = false,
|
|
) {
|
|
if (match(tt.star)) {
|
|
next();
|
|
}
|
|
|
|
if (isStatement && !optionalId && !match(tt.name) && !match(tt._yield)) {
|
|
unexpected();
|
|
}
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|
|
|
let nameScopeStartTokenIndex = null;
|
|
|
|
if (match(tt.name)) {
|
|
// Expression-style functions should limit their name's scope to the function body, so we make
|
|
// a new function scope to enforce that.
|
|
if (!isStatement) {
|
|
nameScopeStartTokenIndex = state.tokens.length;
|
|
state.scopeDepth++;
|
|
}
|
|
parseBindingIdentifier(false);
|
|
}
|
|
|
|
const startTokenIndex = state.tokens.length;
|
|
state.scopeDepth++;
|
|
parseFunctionParams();
|
|
parseFunctionBodyAndFinish(functionStart);
|
|
const endTokenIndex = state.tokens.length;
|
|
// In addition to the block scope of the function body, we need a separate function-style scope
|
|
// that includes the params.
|
|
state.scopes.push(new Scope(startTokenIndex, endTokenIndex, true));
|
|
state.scopeDepth--;
|
|
if (nameScopeStartTokenIndex !== null) {
|
|
state.scopes.push(new Scope(nameScopeStartTokenIndex, endTokenIndex, true));
|
|
state.scopeDepth--;
|
|
}
|
|
}
|
|
|
|
export function parseFunctionParams(
|
|
allowModifiers = false,
|
|
funcContextId = 0,
|
|
) {
|
|
if (isTypeScriptEnabled) {
|
|
tsStartParseFunctionParams();
|
|
} else if (isFlowEnabled) {
|
|
flowStartParseFunctionParams();
|
|
}
|
|
|
|
expect(tt.parenL);
|
|
if (funcContextId) {
|
|
state.tokens[state.tokens.length - 1].contextId = funcContextId;
|
|
}
|
|
parseBindingList(
|
|
tt.parenR,
|
|
false /* isBlockScope */,
|
|
false /* allowEmpty */,
|
|
allowModifiers,
|
|
funcContextId,
|
|
);
|
|
if (funcContextId) {
|
|
state.tokens[state.tokens.length - 1].contextId = funcContextId;
|
|
}
|
|
}
|
|
|
|
// Parse a class declaration or literal (depending on the
|
|
// `isStatement` parameter).
|
|
|
|
export function parseClass(isStatement, optionalId = false) {
|
|
// Put a context ID on the class keyword, the open-brace, and the close-brace, so that later
|
|
// code can easily navigate to meaningful points on the class.
|
|
const contextId = getNextContextId();
|
|
|
|
next();
|
|
state.tokens[state.tokens.length - 1].contextId = contextId;
|
|
state.tokens[state.tokens.length - 1].isExpression = !isStatement;
|
|
// Like with functions, we declare a special "name scope" from the start of the name to the end
|
|
// of the class, but only with expression-style classes, to represent the fact that the name is
|
|
// available to the body of the class but not an outer declaration.
|
|
let nameScopeStartTokenIndex = null;
|
|
if (!isStatement) {
|
|
nameScopeStartTokenIndex = state.tokens.length;
|
|
state.scopeDepth++;
|
|
}
|
|
parseClassId(isStatement, optionalId);
|
|
parseClassSuper();
|
|
const openBraceIndex = state.tokens.length;
|
|
parseClassBody(contextId);
|
|
if (state.error) {
|
|
return;
|
|
}
|
|
state.tokens[openBraceIndex].contextId = contextId;
|
|
state.tokens[state.tokens.length - 1].contextId = contextId;
|
|
if (nameScopeStartTokenIndex !== null) {
|
|
const endTokenIndex = state.tokens.length;
|
|
state.scopes.push(new Scope(nameScopeStartTokenIndex, endTokenIndex, false));
|
|
state.scopeDepth--;
|
|
}
|
|
}
|
|
|
|
function isClassProperty() {
|
|
return match(tt.eq) || match(tt.semi) || match(tt.braceR) || match(tt.bang) || match(tt.colon);
|
|
}
|
|
|
|
function isClassMethod() {
|
|
return match(tt.parenL) || match(tt.lessThan);
|
|
}
|
|
|
|
function parseClassBody(classContextId) {
|
|
expect(tt.braceL);
|
|
|
|
while (!eat(tt.braceR) && !state.error) {
|
|
if (eat(tt.semi)) {
|
|
continue;
|
|
}
|
|
|
|
if (match(tt.at)) {
|
|
parseDecorator();
|
|
continue;
|
|
}
|
|
const memberStart = state.start;
|
|
parseClassMember(memberStart, classContextId);
|
|
}
|
|
}
|
|
|
|
function parseClassMember(memberStart, classContextId) {
|
|
if (isTypeScriptEnabled) {
|
|
tsParseModifiers([
|
|
ContextualKeyword._declare,
|
|
ContextualKeyword._public,
|
|
ContextualKeyword._protected,
|
|
ContextualKeyword._private,
|
|
ContextualKeyword._override,
|
|
]);
|
|
}
|
|
let isStatic = false;
|
|
if (match(tt.name) && state.contextualKeyword === ContextualKeyword._static) {
|
|
parseIdentifier(); // eats 'static'
|
|
if (isClassMethod()) {
|
|
parseClassMethod(memberStart, /* isConstructor */ false);
|
|
return;
|
|
} else if (isClassProperty()) {
|
|
parseClassProperty();
|
|
return;
|
|
}
|
|
// otherwise something static
|
|
state.tokens[state.tokens.length - 1].type = tt._static;
|
|
isStatic = true;
|
|
|
|
if (match(tt.braceL)) {
|
|
// This is a static block. Mark the word "static" with the class context ID for class element
|
|
// detection and parse as a regular block.
|
|
state.tokens[state.tokens.length - 1].contextId = classContextId;
|
|
parseBlock();
|
|
return;
|
|
}
|
|
}
|
|
|
|
parseClassMemberWithIsStatic(memberStart, isStatic, classContextId);
|
|
}
|
|
|
|
function parseClassMemberWithIsStatic(
|
|
memberStart,
|
|
isStatic,
|
|
classContextId,
|
|
) {
|
|
if (isTypeScriptEnabled) {
|
|
if (tsTryParseClassMemberWithIsStatic(isStatic)) {
|
|
return;
|
|
}
|
|
}
|
|
if (eat(tt.star)) {
|
|
// a generator
|
|
parseClassPropertyName(classContextId);
|
|
parseClassMethod(memberStart, /* isConstructor */ false);
|
|
return;
|
|
}
|
|
|
|
// Get the identifier name so we can tell if it's actually a keyword like "async", "get", or
|
|
// "set".
|
|
parseClassPropertyName(classContextId);
|
|
let isConstructor = false;
|
|
const token = state.tokens[state.tokens.length - 1];
|
|
// We allow "constructor" as either an identifier or a string.
|
|
if (token.contextualKeyword === ContextualKeyword._constructor) {
|
|
isConstructor = true;
|
|
}
|
|
parsePostMemberNameModifiers();
|
|
|
|
if (isClassMethod()) {
|
|
parseClassMethod(memberStart, isConstructor);
|
|
} else if (isClassProperty()) {
|
|
parseClassProperty();
|
|
} else if (token.contextualKeyword === ContextualKeyword._async && !isLineTerminator()) {
|
|
state.tokens[state.tokens.length - 1].type = tt._async;
|
|
// an async method
|
|
const isGenerator = match(tt.star);
|
|
if (isGenerator) {
|
|
next();
|
|
}
|
|
|
|
// The so-called parsed name would have been "async": get the real name.
|
|
parseClassPropertyName(classContextId);
|
|
parsePostMemberNameModifiers();
|
|
parseClassMethod(memberStart, false /* isConstructor */);
|
|
} else if (
|
|
(token.contextualKeyword === ContextualKeyword._get ||
|
|
token.contextualKeyword === ContextualKeyword._set) &&
|
|
!(isLineTerminator() && match(tt.star))
|
|
) {
|
|
if (token.contextualKeyword === ContextualKeyword._get) {
|
|
state.tokens[state.tokens.length - 1].type = tt._get;
|
|
} else {
|
|
state.tokens[state.tokens.length - 1].type = tt._set;
|
|
}
|
|
// `get\n*` is an uninitialized property named 'get' followed by a generator.
|
|
// a getter or setter
|
|
// The so-called parsed name would have been "get/set": get the real name.
|
|
parseClassPropertyName(classContextId);
|
|
parseClassMethod(memberStart, /* isConstructor */ false);
|
|
} else if (isLineTerminator()) {
|
|
// an uninitialized class property (due to ASI, since we don't otherwise recognize the next token)
|
|
parseClassProperty();
|
|
} else {
|
|
unexpected();
|
|
}
|
|
}
|
|
|
|
function parseClassMethod(functionStart, isConstructor) {
|
|
if (isTypeScriptEnabled) {
|
|
tsTryParseTypeParameters();
|
|
} else if (isFlowEnabled) {
|
|
if (match(tt.lessThan)) {
|
|
flowParseTypeParameterDeclaration();
|
|
}
|
|
}
|
|
parseMethod(functionStart, isConstructor);
|
|
}
|
|
|
|
// Return the name of the class property, if it is a simple identifier.
|
|
export function parseClassPropertyName(classContextId) {
|
|
parsePropertyName(classContextId);
|
|
}
|
|
|
|
export function parsePostMemberNameModifiers() {
|
|
if (isTypeScriptEnabled) {
|
|
const oldIsType = pushTypeContext(0);
|
|
eat(tt.question);
|
|
popTypeContext(oldIsType);
|
|
}
|
|
}
|
|
|
|
export function parseClassProperty() {
|
|
if (isTypeScriptEnabled) {
|
|
eat(tt.bang);
|
|
tsTryParseTypeAnnotation();
|
|
} else if (isFlowEnabled) {
|
|
if (match(tt.colon)) {
|
|
flowParseTypeAnnotation();
|
|
}
|
|
}
|
|
|
|
if (match(tt.eq)) {
|
|
const equalsTokenIndex = state.tokens.length;
|
|
next();
|
|
parseMaybeAssign();
|
|
state.tokens[equalsTokenIndex].rhsEndIndex = state.tokens.length;
|
|
}
|
|
semicolon();
|
|
}
|
|
|
|
function parseClassId(isStatement, optionalId = false) {
|
|
if (
|
|
isTypeScriptEnabled &&
|
|
(!isStatement || optionalId) &&
|
|
isContextual(ContextualKeyword._implements)
|
|
) {
|
|
return;
|
|
}
|
|
|
|
if (match(tt.name)) {
|
|
parseBindingIdentifier(true);
|
|
}
|
|
|
|
if (isTypeScriptEnabled) {
|
|
tsTryParseTypeParameters();
|
|
} else if (isFlowEnabled) {
|
|
if (match(tt.lessThan)) {
|
|
flowParseTypeParameterDeclaration();
|
|
}
|
|
}
|
|
}
|
|
|
|
// Returns true if there was a superclass.
|
|
function parseClassSuper() {
|
|
let hasSuper = false;
|
|
if (eat(tt._extends)) {
|
|
parseExprSubscripts();
|
|
hasSuper = true;
|
|
} else {
|
|
hasSuper = false;
|
|
}
|
|
if (isTypeScriptEnabled) {
|
|
tsAfterParseClassSuper(hasSuper);
|
|
} else if (isFlowEnabled) {
|
|
flowAfterParseClassSuper(hasSuper);
|
|
}
|
|
}
|
|
|
|
// Parses module export declaration.
|
|
|
|
export function parseExport() {
|
|
const exportIndex = state.tokens.length - 1;
|
|
if (isTypeScriptEnabled) {
|
|
if (tsTryParseExport()) {
|
|
return;
|
|
}
|
|
}
|
|
// export * from '...'
|
|
if (shouldParseExportStar()) {
|
|
parseExportStar();
|
|
} else if (isExportDefaultSpecifier()) {
|
|
// export default from
|
|
parseIdentifier();
|
|
if (match(tt.comma) && lookaheadType() === tt.star) {
|
|
expect(tt.comma);
|
|
expect(tt.star);
|
|
expectContextual(ContextualKeyword._as);
|
|
parseIdentifier();
|
|
} else {
|
|
parseExportSpecifiersMaybe();
|
|
}
|
|
parseExportFrom();
|
|
} else if (eat(tt._default)) {
|
|
// export default ...
|
|
parseExportDefaultExpression();
|
|
} else if (shouldParseExportDeclaration()) {
|
|
parseExportDeclaration();
|
|
} else {
|
|
// export { x, y as z } [from '...']
|
|
parseExportSpecifiers();
|
|
parseExportFrom();
|
|
}
|
|
state.tokens[exportIndex].rhsEndIndex = state.tokens.length;
|
|
}
|
|
|
|
function parseExportDefaultExpression() {
|
|
if (isTypeScriptEnabled) {
|
|
if (tsTryParseExportDefaultExpression()) {
|
|
return;
|
|
}
|
|
}
|
|
const functionStart = state.start;
|
|
if (eat(tt._function)) {
|
|
parseFunction(functionStart, true, true);
|
|
} else if (isContextual(ContextualKeyword._async) && lookaheadType() === tt._function) {
|
|
// async function declaration
|
|
eatContextual(ContextualKeyword._async);
|
|
eat(tt._function);
|
|
parseFunction(functionStart, true, true);
|
|
} else if (match(tt._class)) {
|
|
parseClass(true, true);
|
|
} else if (match(tt.at)) {
|
|
parseDecorators();
|
|
parseClass(true, true);
|
|
} else {
|
|
parseMaybeAssign();
|
|
semicolon();
|
|
}
|
|
}
|
|
|
|
function parseExportDeclaration() {
|
|
if (isTypeScriptEnabled) {
|
|
tsParseExportDeclaration();
|
|
} else if (isFlowEnabled) {
|
|
flowParseExportDeclaration();
|
|
} else {
|
|
parseStatement(true);
|
|
}
|
|
}
|
|
|
|
function isExportDefaultSpecifier() {
|
|
if (isTypeScriptEnabled && tsIsDeclarationStart()) {
|
|
return false;
|
|
} else if (isFlowEnabled && flowShouldDisallowExportDefaultSpecifier()) {
|
|
return false;
|
|
}
|
|
if (match(tt.name)) {
|
|
return state.contextualKeyword !== ContextualKeyword._async;
|
|
}
|
|
|
|
if (!match(tt._default)) {
|
|
return false;
|
|
}
|
|
|
|
const _next = nextTokenStart();
|
|
const lookahead = lookaheadTypeAndKeyword();
|
|
const hasFrom =
|
|
lookahead.type === tt.name && lookahead.contextualKeyword === ContextualKeyword._from;
|
|
if (lookahead.type === tt.comma) {
|
|
return true;
|
|
}
|
|
// lookahead again when `export default from` is seen
|
|
if (hasFrom) {
|
|
const nextAfterFrom = input.charCodeAt(nextTokenStartSince(_next + 4));
|
|
return nextAfterFrom === charCodes.quotationMark || nextAfterFrom === charCodes.apostrophe;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function parseExportSpecifiersMaybe() {
|
|
if (eat(tt.comma)) {
|
|
parseExportSpecifiers();
|
|
}
|
|
}
|
|
|
|
export function parseExportFrom() {
|
|
if (eatContextual(ContextualKeyword._from)) {
|
|
parseExprAtom();
|
|
}
|
|
semicolon();
|
|
}
|
|
|
|
function shouldParseExportStar() {
|
|
if (isFlowEnabled) {
|
|
return flowShouldParseExportStar();
|
|
} else {
|
|
return match(tt.star);
|
|
}
|
|
}
|
|
|
|
function parseExportStar() {
|
|
if (isFlowEnabled) {
|
|
flowParseExportStar();
|
|
} else {
|
|
baseParseExportStar();
|
|
}
|
|
}
|
|
|
|
export function baseParseExportStar() {
|
|
expect(tt.star);
|
|
|
|
if (isContextual(ContextualKeyword._as)) {
|
|
parseExportNamespace();
|
|
} else {
|
|
parseExportFrom();
|
|
}
|
|
}
|
|
|
|
function parseExportNamespace() {
|
|
next();
|
|
state.tokens[state.tokens.length - 1].type = tt._as;
|
|
parseIdentifier();
|
|
parseExportSpecifiersMaybe();
|
|
parseExportFrom();
|
|
}
|
|
|
|
function shouldParseExportDeclaration() {
|
|
return (
|
|
(isTypeScriptEnabled && tsIsDeclarationStart()) ||
|
|
(isFlowEnabled && flowShouldParseExportDeclaration()) ||
|
|
state.type === tt._var ||
|
|
state.type === tt._const ||
|
|
state.type === tt._let ||
|
|
state.type === tt._function ||
|
|
state.type === tt._class ||
|
|
isContextual(ContextualKeyword._async) ||
|
|
match(tt.at)
|
|
);
|
|
}
|
|
|
|
// Parses a comma-separated list of module exports.
|
|
export function parseExportSpecifiers() {
|
|
let first = true;
|
|
|
|
// export { x, y as z } [from '...']
|
|
expect(tt.braceL);
|
|
|
|
while (!eat(tt.braceR) && !state.error) {
|
|
if (first) {
|
|
first = false;
|
|
} else {
|
|
expect(tt.comma);
|
|
if (eat(tt.braceR)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
parseIdentifier();
|
|
state.tokens[state.tokens.length - 1].identifierRole = IdentifierRole.ExportAccess;
|
|
if (eatContextual(ContextualKeyword._as)) {
|
|
parseIdentifier();
|
|
}
|
|
}
|
|
}
|
|
|
|
// Parses import declaration.
|
|
|
|
export function parseImport() {
|
|
if (isTypeScriptEnabled && match(tt.name) && lookaheadType() === tt.eq) {
|
|
tsParseImportEqualsDeclaration();
|
|
return;
|
|
}
|
|
if (isTypeScriptEnabled && isContextual(ContextualKeyword._type)) {
|
|
const lookahead = lookaheadType();
|
|
if (lookahead === tt.name) {
|
|
// One of these `import type` cases:
|
|
// import type T = require('T');
|
|
// import type A from 'A';
|
|
expectContextual(ContextualKeyword._type);
|
|
if (lookaheadType() === tt.eq) {
|
|
tsParseImportEqualsDeclaration();
|
|
return;
|
|
}
|
|
// If this is an `import type...from` statement, then we already ate the
|
|
// type token, so proceed to the regular import parser.
|
|
} else if (lookahead === tt.star || lookahead === tt.braceL) {
|
|
// One of these `import type` cases, in which case we can eat the type token
|
|
// and proceed as normal:
|
|
// import type * as A from 'A';
|
|
// import type {a} from 'A';
|
|
expectContextual(ContextualKeyword._type);
|
|
}
|
|
// Otherwise, we are importing the name "type".
|
|
}
|
|
|
|
// import '...'
|
|
if (match(tt.string)) {
|
|
parseExprAtom();
|
|
} else {
|
|
parseImportSpecifiers();
|
|
expectContextual(ContextualKeyword._from);
|
|
parseExprAtom();
|
|
}
|
|
semicolon();
|
|
}
|
|
|
|
// eslint-disable-next-line no-unused-vars
|
|
function shouldParseDefaultImport() {
|
|
return match(tt.name);
|
|
}
|
|
|
|
function parseImportSpecifierLocal() {
|
|
parseImportedIdentifier();
|
|
}
|
|
|
|
// Parses a comma-separated list of module imports.
|
|
function parseImportSpecifiers() {
|
|
if (isFlowEnabled) {
|
|
flowStartParseImportSpecifiers();
|
|
}
|
|
|
|
let first = true;
|
|
if (shouldParseDefaultImport()) {
|
|
// import defaultObj, { x, y as z } from '...'
|
|
parseImportSpecifierLocal();
|
|
|
|
if (!eat(tt.comma)) return;
|
|
}
|
|
|
|
if (match(tt.star)) {
|
|
next();
|
|
expectContextual(ContextualKeyword._as);
|
|
|
|
parseImportSpecifierLocal();
|
|
|
|
return;
|
|
}
|
|
|
|
expect(tt.braceL);
|
|
while (!eat(tt.braceR) && !state.error) {
|
|
if (first) {
|
|
first = false;
|
|
} else {
|
|
// Detect an attempt to deep destructure
|
|
if (eat(tt.colon)) {
|
|
unexpected(
|
|
"ES2015 named imports do not destructure. Use another statement for destructuring after the import.",
|
|
);
|
|
}
|
|
|
|
expect(tt.comma);
|
|
if (eat(tt.braceR)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
parseImportSpecifier();
|
|
}
|
|
}
|
|
|
|
function parseImportSpecifier() {
|
|
if (isFlowEnabled) {
|
|
flowParseImportSpecifier();
|
|
return;
|
|
}
|
|
parseImportedIdentifier();
|
|
if (isContextual(ContextualKeyword._as)) {
|
|
state.tokens[state.tokens.length - 1].identifierRole = IdentifierRole.ImportAccess;
|
|
next();
|
|
parseImportedIdentifier();
|
|
}
|
|
}
|