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| author | Philipp Tanlak <philipp.tanlak@gmail.com> | 2025-11-24 20:54:57 +0100 |
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| committer | Philipp Tanlak <philipp.tanlak@gmail.com> | 2025-11-24 20:57:48 +0100 |
| commit | b1e2c8fd5cb5dfa46bc440a12eafaf56cd844b1c (patch) | |
| tree | 49d360fd6cbc6a2754efe93524ac47ff0fbe0f7d /node_modules/sucrase/dist/parser/plugins/jsx/index.js | |
Docs
Diffstat (limited to 'node_modules/sucrase/dist/parser/plugins/jsx/index.js')
| -rw-r--r-- | node_modules/sucrase/dist/parser/plugins/jsx/index.js | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/node_modules/sucrase/dist/parser/plugins/jsx/index.js b/node_modules/sucrase/dist/parser/plugins/jsx/index.js new file mode 100644 index 0000000..41797de --- /dev/null +++ b/node_modules/sucrase/dist/parser/plugins/jsx/index.js @@ -0,0 +1,367 @@ +"use strict";Object.defineProperty(exports, "__esModule", {value: true}); + + + + + + + + + +var _index = require('../../tokenizer/index'); +var _types = require('../../tokenizer/types'); +var _base = require('../../traverser/base'); +var _expression = require('../../traverser/expression'); +var _util = require('../../traverser/util'); +var _charcodes = require('../../util/charcodes'); +var _identifier = require('../../util/identifier'); +var _typescript = require('../typescript'); + +/** + * Read token with JSX contents. + * + * In addition to detecting jsxTagStart and also regular tokens that might be + * part of an expression, this code detects the start and end of text ranges + * within JSX children. In order to properly count the number of children, we + * distinguish jsxText from jsxEmptyText, which is a text range that simplifies + * to the empty string after JSX whitespace trimming. + * + * It turns out that a JSX text range will simplify to the empty string if and + * only if both of these conditions hold: + * - The range consists entirely of whitespace characters (only counting space, + * tab, \r, and \n). + * - The range has at least one newline. + * This can be proven by analyzing any implementation of whitespace trimming, + * e.g. formatJSXTextLiteral in Sucrase or cleanJSXElementLiteralChild in Babel. + */ +function jsxReadToken() { + let sawNewline = false; + let sawNonWhitespace = false; + while (true) { + if (_base.state.pos >= _base.input.length) { + _util.unexpected.call(void 0, "Unterminated JSX contents"); + return; + } + + const ch = _base.input.charCodeAt(_base.state.pos); + if (ch === _charcodes.charCodes.lessThan || ch === _charcodes.charCodes.leftCurlyBrace) { + if (_base.state.pos === _base.state.start) { + if (ch === _charcodes.charCodes.lessThan) { + _base.state.pos++; + _index.finishToken.call(void 0, _types.TokenType.jsxTagStart); + return; + } + _index.getTokenFromCode.call(void 0, ch); + return; + } + if (sawNewline && !sawNonWhitespace) { + _index.finishToken.call(void 0, _types.TokenType.jsxEmptyText); + } else { + _index.finishToken.call(void 0, _types.TokenType.jsxText); + } + return; + } + + // This is part of JSX text. + if (ch === _charcodes.charCodes.lineFeed) { + sawNewline = true; + } else if (ch !== _charcodes.charCodes.space && ch !== _charcodes.charCodes.carriageReturn && ch !== _charcodes.charCodes.tab) { + sawNonWhitespace = true; + } + _base.state.pos++; + } +} + +function jsxReadString(quote) { + _base.state.pos++; + for (;;) { + if (_base.state.pos >= _base.input.length) { + _util.unexpected.call(void 0, "Unterminated string constant"); + return; + } + + const ch = _base.input.charCodeAt(_base.state.pos); + if (ch === quote) { + _base.state.pos++; + break; + } + _base.state.pos++; + } + _index.finishToken.call(void 0, _types.TokenType.string); +} + +// Read a JSX identifier (valid tag or attribute name). +// +// Optimized version since JSX identifiers can't contain +// escape characters and so can be read as single slice. +// Also assumes that first character was already checked +// by isIdentifierStart in readToken. + +function jsxReadWord() { + let ch; + do { + if (_base.state.pos > _base.input.length) { + _util.unexpected.call(void 0, "Unexpectedly reached the end of input."); + return; + } + ch = _base.input.charCodeAt(++_base.state.pos); + } while (_identifier.IS_IDENTIFIER_CHAR[ch] || ch === _charcodes.charCodes.dash); + _index.finishToken.call(void 0, _types.TokenType.jsxName); +} + +// Parse next token as JSX identifier +function jsxParseIdentifier() { + nextJSXTagToken(); +} + +// Parse namespaced identifier. +function jsxParseNamespacedName(identifierRole) { + jsxParseIdentifier(); + if (!_index.eat.call(void 0, _types.TokenType.colon)) { + // Plain identifier, so this is an access. + _base.state.tokens[_base.state.tokens.length - 1].identifierRole = identifierRole; + return; + } + // Process the second half of the namespaced name. + jsxParseIdentifier(); +} + +// Parses element name in any form - namespaced, member +// or single identifier. +function jsxParseElementName() { + const firstTokenIndex = _base.state.tokens.length; + jsxParseNamespacedName(_index.IdentifierRole.Access); + let hadDot = false; + while (_index.match.call(void 0, _types.TokenType.dot)) { + hadDot = true; + nextJSXTagToken(); + jsxParseIdentifier(); + } + // For tags like <div> with a lowercase letter and no dots, the name is + // actually *not* an identifier access, since it's referring to a built-in + // tag name. Remove the identifier role in this case so that it's not + // accidentally transformed by the imports transform when preserving JSX. + if (!hadDot) { + const firstToken = _base.state.tokens[firstTokenIndex]; + const firstChar = _base.input.charCodeAt(firstToken.start); + if (firstChar >= _charcodes.charCodes.lowercaseA && firstChar <= _charcodes.charCodes.lowercaseZ) { + firstToken.identifierRole = null; + } + } +} + +// Parses any type of JSX attribute value. +function jsxParseAttributeValue() { + switch (_base.state.type) { + case _types.TokenType.braceL: + _index.next.call(void 0, ); + _expression.parseExpression.call(void 0, ); + nextJSXTagToken(); + return; + + case _types.TokenType.jsxTagStart: + jsxParseElement(); + nextJSXTagToken(); + return; + + case _types.TokenType.string: + nextJSXTagToken(); + return; + + default: + _util.unexpected.call(void 0, "JSX value should be either an expression or a quoted JSX text"); + } +} + +// Parse JSX spread child, after already processing the { +// Does not parse the closing } +function jsxParseSpreadChild() { + _util.expect.call(void 0, _types.TokenType.ellipsis); + _expression.parseExpression.call(void 0, ); +} + +// Parses JSX opening tag starting after "<". +// Returns true if the tag was self-closing. +// Does not parse the last token. +function jsxParseOpeningElement(initialTokenIndex) { + if (_index.match.call(void 0, _types.TokenType.jsxTagEnd)) { + // This is an open-fragment. + return false; + } + jsxParseElementName(); + if (_base.isTypeScriptEnabled) { + _typescript.tsTryParseJSXTypeArgument.call(void 0, ); + } + let hasSeenPropSpread = false; + while (!_index.match.call(void 0, _types.TokenType.slash) && !_index.match.call(void 0, _types.TokenType.jsxTagEnd) && !_base.state.error) { + if (_index.eat.call(void 0, _types.TokenType.braceL)) { + hasSeenPropSpread = true; + _util.expect.call(void 0, _types.TokenType.ellipsis); + _expression.parseMaybeAssign.call(void 0, ); + // } + nextJSXTagToken(); + continue; + } + if ( + hasSeenPropSpread && + _base.state.end - _base.state.start === 3 && + _base.input.charCodeAt(_base.state.start) === _charcodes.charCodes.lowercaseK && + _base.input.charCodeAt(_base.state.start + 1) === _charcodes.charCodes.lowercaseE && + _base.input.charCodeAt(_base.state.start + 2) === _charcodes.charCodes.lowercaseY + ) { + _base.state.tokens[initialTokenIndex].jsxRole = _index.JSXRole.KeyAfterPropSpread; + } + jsxParseNamespacedName(_index.IdentifierRole.ObjectKey); + if (_index.match.call(void 0, _types.TokenType.eq)) { + nextJSXTagToken(); + jsxParseAttributeValue(); + } + } + const isSelfClosing = _index.match.call(void 0, _types.TokenType.slash); + if (isSelfClosing) { + // / + nextJSXTagToken(); + } + return isSelfClosing; +} + +// Parses JSX closing tag starting after "</". +// Does not parse the last token. +function jsxParseClosingElement() { + if (_index.match.call(void 0, _types.TokenType.jsxTagEnd)) { + // Fragment syntax, so we immediately have a tag end. + return; + } + jsxParseElementName(); +} + +// Parses entire JSX element, including its opening tag +// (starting after "<"), attributes, contents and closing tag. +// Does not parse the last token. +function jsxParseElementAt() { + const initialTokenIndex = _base.state.tokens.length - 1; + _base.state.tokens[initialTokenIndex].jsxRole = _index.JSXRole.NoChildren; + let numExplicitChildren = 0; + const isSelfClosing = jsxParseOpeningElement(initialTokenIndex); + if (!isSelfClosing) { + nextJSXExprToken(); + while (true) { + switch (_base.state.type) { + case _types.TokenType.jsxTagStart: + nextJSXTagToken(); + if (_index.match.call(void 0, _types.TokenType.slash)) { + nextJSXTagToken(); + jsxParseClosingElement(); + // Key after prop spread takes precedence over number of children, + // since it means we switch to createElement, which doesn't care + // about number of children. + if (_base.state.tokens[initialTokenIndex].jsxRole !== _index.JSXRole.KeyAfterPropSpread) { + if (numExplicitChildren === 1) { + _base.state.tokens[initialTokenIndex].jsxRole = _index.JSXRole.OneChild; + } else if (numExplicitChildren > 1) { + _base.state.tokens[initialTokenIndex].jsxRole = _index.JSXRole.StaticChildren; + } + } + return; + } + numExplicitChildren++; + jsxParseElementAt(); + nextJSXExprToken(); + break; + + case _types.TokenType.jsxText: + numExplicitChildren++; + nextJSXExprToken(); + break; + + case _types.TokenType.jsxEmptyText: + nextJSXExprToken(); + break; + + case _types.TokenType.braceL: + _index.next.call(void 0, ); + if (_index.match.call(void 0, _types.TokenType.ellipsis)) { + jsxParseSpreadChild(); + nextJSXExprToken(); + // Spread children are a mechanism to explicitly mark children as + // static, so count it as 2 children to satisfy the "more than one + // child" condition. + numExplicitChildren += 2; + } else { + // If we see {}, this is an empty pseudo-expression that doesn't + // count as a child. + if (!_index.match.call(void 0, _types.TokenType.braceR)) { + numExplicitChildren++; + _expression.parseExpression.call(void 0, ); + } + nextJSXExprToken(); + } + + break; + + // istanbul ignore next - should never happen + default: + _util.unexpected.call(void 0, ); + return; + } + } + } +} + +// Parses entire JSX element from current position. +// Does not parse the last token. + function jsxParseElement() { + nextJSXTagToken(); + jsxParseElementAt(); +} exports.jsxParseElement = jsxParseElement; + +// ================================== +// Overrides +// ================================== + + function nextJSXTagToken() { + _base.state.tokens.push(new (0, _index.Token)()); + _index.skipSpace.call(void 0, ); + _base.state.start = _base.state.pos; + const code = _base.input.charCodeAt(_base.state.pos); + + if (_identifier.IS_IDENTIFIER_START[code]) { + jsxReadWord(); + } else if (code === _charcodes.charCodes.quotationMark || code === _charcodes.charCodes.apostrophe) { + jsxReadString(code); + } else { + // The following tokens are just one character each. + ++_base.state.pos; + switch (code) { + case _charcodes.charCodes.greaterThan: + _index.finishToken.call(void 0, _types.TokenType.jsxTagEnd); + break; + case _charcodes.charCodes.lessThan: + _index.finishToken.call(void 0, _types.TokenType.jsxTagStart); + break; + case _charcodes.charCodes.slash: + _index.finishToken.call(void 0, _types.TokenType.slash); + break; + case _charcodes.charCodes.equalsTo: + _index.finishToken.call(void 0, _types.TokenType.eq); + break; + case _charcodes.charCodes.leftCurlyBrace: + _index.finishToken.call(void 0, _types.TokenType.braceL); + break; + case _charcodes.charCodes.dot: + _index.finishToken.call(void 0, _types.TokenType.dot); + break; + case _charcodes.charCodes.colon: + _index.finishToken.call(void 0, _types.TokenType.colon); + break; + default: + _util.unexpected.call(void 0, ); + } + } +} exports.nextJSXTagToken = nextJSXTagToken; + +function nextJSXExprToken() { + _base.state.tokens.push(new (0, _index.Token)()); + _base.state.start = _base.state.pos; + jsxReadToken(); +} |