368 lines
12 KiB
JavaScript
368 lines
12 KiB
JavaScript
"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();
|
|
}
|