forked from Fediversity/fediversity.eu
368 lines
12 KiB
JavaScript
368 lines
12 KiB
JavaScript
"use strict";Object.defineProperty(exports, "__esModule", {value: true});
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var _index = require('../../tokenizer/index');
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var _types = require('../../tokenizer/types');
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var _base = require('../../traverser/base');
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var _expression = require('../../traverser/expression');
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var _util = require('../../traverser/util');
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var _charcodes = require('../../util/charcodes');
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var _identifier = require('../../util/identifier');
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var _typescript = require('../typescript');
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/**
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* Read token with JSX contents.
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*
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* In addition to detecting jsxTagStart and also regular tokens that might be
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* part of an expression, this code detects the start and end of text ranges
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* within JSX children. In order to properly count the number of children, we
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* distinguish jsxText from jsxEmptyText, which is a text range that simplifies
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* to the empty string after JSX whitespace trimming.
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*
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* It turns out that a JSX text range will simplify to the empty string if and
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* only if both of these conditions hold:
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* - The range consists entirely of whitespace characters (only counting space,
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* tab, \r, and \n).
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* - The range has at least one newline.
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* This can be proven by analyzing any implementation of whitespace trimming,
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* e.g. formatJSXTextLiteral in Sucrase or cleanJSXElementLiteralChild in Babel.
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*/
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function jsxReadToken() {
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let sawNewline = false;
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let sawNonWhitespace = false;
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while (true) {
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if (_base.state.pos >= _base.input.length) {
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_util.unexpected.call(void 0, "Unterminated JSX contents");
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return;
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}
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const ch = _base.input.charCodeAt(_base.state.pos);
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if (ch === _charcodes.charCodes.lessThan || ch === _charcodes.charCodes.leftCurlyBrace) {
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if (_base.state.pos === _base.state.start) {
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if (ch === _charcodes.charCodes.lessThan) {
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_base.state.pos++;
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_index.finishToken.call(void 0, _types.TokenType.jsxTagStart);
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return;
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}
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_index.getTokenFromCode.call(void 0, ch);
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return;
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}
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if (sawNewline && !sawNonWhitespace) {
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_index.finishToken.call(void 0, _types.TokenType.jsxEmptyText);
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} else {
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_index.finishToken.call(void 0, _types.TokenType.jsxText);
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}
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return;
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}
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// This is part of JSX text.
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if (ch === _charcodes.charCodes.lineFeed) {
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sawNewline = true;
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} else if (ch !== _charcodes.charCodes.space && ch !== _charcodes.charCodes.carriageReturn && ch !== _charcodes.charCodes.tab) {
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sawNonWhitespace = true;
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}
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_base.state.pos++;
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}
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}
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function jsxReadString(quote) {
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_base.state.pos++;
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for (;;) {
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if (_base.state.pos >= _base.input.length) {
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_util.unexpected.call(void 0, "Unterminated string constant");
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return;
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}
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const ch = _base.input.charCodeAt(_base.state.pos);
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if (ch === quote) {
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_base.state.pos++;
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break;
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}
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_base.state.pos++;
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}
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_index.finishToken.call(void 0, _types.TokenType.string);
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}
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// Read a JSX identifier (valid tag or attribute name).
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//
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// Optimized version since JSX identifiers can't contain
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// escape characters and so can be read as single slice.
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// Also assumes that first character was already checked
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// by isIdentifierStart in readToken.
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function jsxReadWord() {
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let ch;
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do {
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if (_base.state.pos > _base.input.length) {
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_util.unexpected.call(void 0, "Unexpectedly reached the end of input.");
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return;
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}
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ch = _base.input.charCodeAt(++_base.state.pos);
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} while (_identifier.IS_IDENTIFIER_CHAR[ch] || ch === _charcodes.charCodes.dash);
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_index.finishToken.call(void 0, _types.TokenType.jsxName);
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}
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// Parse next token as JSX identifier
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function jsxParseIdentifier() {
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nextJSXTagToken();
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}
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// Parse namespaced identifier.
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function jsxParseNamespacedName(identifierRole) {
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jsxParseIdentifier();
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if (!_index.eat.call(void 0, _types.TokenType.colon)) {
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// Plain identifier, so this is an access.
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_base.state.tokens[_base.state.tokens.length - 1].identifierRole = identifierRole;
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return;
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}
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// Process the second half of the namespaced name.
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jsxParseIdentifier();
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}
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// Parses element name in any form - namespaced, member
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// or single identifier.
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function jsxParseElementName() {
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const firstTokenIndex = _base.state.tokens.length;
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jsxParseNamespacedName(_index.IdentifierRole.Access);
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let hadDot = false;
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while (_index.match.call(void 0, _types.TokenType.dot)) {
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hadDot = true;
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nextJSXTagToken();
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jsxParseIdentifier();
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}
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// For tags like <div> with a lowercase letter and no dots, the name is
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// actually *not* an identifier access, since it's referring to a built-in
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// tag name. Remove the identifier role in this case so that it's not
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// accidentally transformed by the imports transform when preserving JSX.
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if (!hadDot) {
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const firstToken = _base.state.tokens[firstTokenIndex];
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const firstChar = _base.input.charCodeAt(firstToken.start);
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if (firstChar >= _charcodes.charCodes.lowercaseA && firstChar <= _charcodes.charCodes.lowercaseZ) {
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firstToken.identifierRole = null;
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}
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}
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}
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// Parses any type of JSX attribute value.
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function jsxParseAttributeValue() {
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switch (_base.state.type) {
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case _types.TokenType.braceL:
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_index.next.call(void 0, );
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_expression.parseExpression.call(void 0, );
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nextJSXTagToken();
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return;
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case _types.TokenType.jsxTagStart:
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jsxParseElement();
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nextJSXTagToken();
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return;
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case _types.TokenType.string:
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nextJSXTagToken();
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return;
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default:
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_util.unexpected.call(void 0, "JSX value should be either an expression or a quoted JSX text");
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}
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}
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// Parse JSX spread child, after already processing the {
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// Does not parse the closing }
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function jsxParseSpreadChild() {
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_util.expect.call(void 0, _types.TokenType.ellipsis);
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_expression.parseExpression.call(void 0, );
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}
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// Parses JSX opening tag starting after "<".
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// Returns true if the tag was self-closing.
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// Does not parse the last token.
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function jsxParseOpeningElement(initialTokenIndex) {
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if (_index.match.call(void 0, _types.TokenType.jsxTagEnd)) {
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// This is an open-fragment.
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return false;
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}
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jsxParseElementName();
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if (_base.isTypeScriptEnabled) {
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_typescript.tsTryParseJSXTypeArgument.call(void 0, );
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}
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let hasSeenPropSpread = false;
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while (!_index.match.call(void 0, _types.TokenType.slash) && !_index.match.call(void 0, _types.TokenType.jsxTagEnd) && !_base.state.error) {
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if (_index.eat.call(void 0, _types.TokenType.braceL)) {
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hasSeenPropSpread = true;
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_util.expect.call(void 0, _types.TokenType.ellipsis);
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_expression.parseMaybeAssign.call(void 0, );
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// }
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nextJSXTagToken();
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continue;
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}
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if (
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hasSeenPropSpread &&
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_base.state.end - _base.state.start === 3 &&
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_base.input.charCodeAt(_base.state.start) === _charcodes.charCodes.lowercaseK &&
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_base.input.charCodeAt(_base.state.start + 1) === _charcodes.charCodes.lowercaseE &&
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_base.input.charCodeAt(_base.state.start + 2) === _charcodes.charCodes.lowercaseY
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) {
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_base.state.tokens[initialTokenIndex].jsxRole = _index.JSXRole.KeyAfterPropSpread;
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}
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jsxParseNamespacedName(_index.IdentifierRole.ObjectKey);
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if (_index.match.call(void 0, _types.TokenType.eq)) {
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nextJSXTagToken();
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jsxParseAttributeValue();
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}
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}
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const isSelfClosing = _index.match.call(void 0, _types.TokenType.slash);
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if (isSelfClosing) {
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// /
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nextJSXTagToken();
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}
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return isSelfClosing;
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}
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// Parses JSX closing tag starting after "</".
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// Does not parse the last token.
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function jsxParseClosingElement() {
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if (_index.match.call(void 0, _types.TokenType.jsxTagEnd)) {
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// Fragment syntax, so we immediately have a tag end.
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return;
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}
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jsxParseElementName();
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}
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// Parses entire JSX element, including its opening tag
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// (starting after "<"), attributes, contents and closing tag.
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// Does not parse the last token.
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function jsxParseElementAt() {
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const initialTokenIndex = _base.state.tokens.length - 1;
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_base.state.tokens[initialTokenIndex].jsxRole = _index.JSXRole.NoChildren;
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let numExplicitChildren = 0;
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const isSelfClosing = jsxParseOpeningElement(initialTokenIndex);
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if (!isSelfClosing) {
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nextJSXExprToken();
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while (true) {
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switch (_base.state.type) {
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case _types.TokenType.jsxTagStart:
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nextJSXTagToken();
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if (_index.match.call(void 0, _types.TokenType.slash)) {
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nextJSXTagToken();
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jsxParseClosingElement();
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// Key after prop spread takes precedence over number of children,
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// since it means we switch to createElement, which doesn't care
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// about number of children.
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if (_base.state.tokens[initialTokenIndex].jsxRole !== _index.JSXRole.KeyAfterPropSpread) {
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if (numExplicitChildren === 1) {
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_base.state.tokens[initialTokenIndex].jsxRole = _index.JSXRole.OneChild;
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} else if (numExplicitChildren > 1) {
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_base.state.tokens[initialTokenIndex].jsxRole = _index.JSXRole.StaticChildren;
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}
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}
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return;
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}
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numExplicitChildren++;
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jsxParseElementAt();
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nextJSXExprToken();
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break;
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case _types.TokenType.jsxText:
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numExplicitChildren++;
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nextJSXExprToken();
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break;
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case _types.TokenType.jsxEmptyText:
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nextJSXExprToken();
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break;
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case _types.TokenType.braceL:
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_index.next.call(void 0, );
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if (_index.match.call(void 0, _types.TokenType.ellipsis)) {
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jsxParseSpreadChild();
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nextJSXExprToken();
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// Spread children are a mechanism to explicitly mark children as
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// static, so count it as 2 children to satisfy the "more than one
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// child" condition.
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numExplicitChildren += 2;
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} else {
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// If we see {}, this is an empty pseudo-expression that doesn't
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// count as a child.
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if (!_index.match.call(void 0, _types.TokenType.braceR)) {
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numExplicitChildren++;
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_expression.parseExpression.call(void 0, );
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}
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nextJSXExprToken();
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}
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break;
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// istanbul ignore next - should never happen
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default:
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_util.unexpected.call(void 0, );
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return;
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}
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}
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}
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}
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// Parses entire JSX element from current position.
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// Does not parse the last token.
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function jsxParseElement() {
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nextJSXTagToken();
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jsxParseElementAt();
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} exports.jsxParseElement = jsxParseElement;
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// ==================================
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// Overrides
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// ==================================
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function nextJSXTagToken() {
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_base.state.tokens.push(new (0, _index.Token)());
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_index.skipSpace.call(void 0, );
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_base.state.start = _base.state.pos;
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const code = _base.input.charCodeAt(_base.state.pos);
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if (_identifier.IS_IDENTIFIER_START[code]) {
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jsxReadWord();
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} else if (code === _charcodes.charCodes.quotationMark || code === _charcodes.charCodes.apostrophe) {
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jsxReadString(code);
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} else {
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// The following tokens are just one character each.
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++_base.state.pos;
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switch (code) {
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case _charcodes.charCodes.greaterThan:
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_index.finishToken.call(void 0, _types.TokenType.jsxTagEnd);
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break;
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case _charcodes.charCodes.lessThan:
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_index.finishToken.call(void 0, _types.TokenType.jsxTagStart);
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break;
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case _charcodes.charCodes.slash:
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_index.finishToken.call(void 0, _types.TokenType.slash);
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break;
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case _charcodes.charCodes.equalsTo:
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_index.finishToken.call(void 0, _types.TokenType.eq);
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break;
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case _charcodes.charCodes.leftCurlyBrace:
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_index.finishToken.call(void 0, _types.TokenType.braceL);
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break;
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case _charcodes.charCodes.dot:
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_index.finishToken.call(void 0, _types.TokenType.dot);
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break;
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case _charcodes.charCodes.colon:
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_index.finishToken.call(void 0, _types.TokenType.colon);
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break;
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default:
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_util.unexpected.call(void 0, );
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}
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}
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} exports.nextJSXTagToken = nextJSXTagToken;
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function nextJSXExprToken() {
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_base.state.tokens.push(new (0, _index.Token)());
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_base.state.start = _base.state.pos;
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jsxReadToken();
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}
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