403 lines
17 KiB
JavaScript
403 lines
17 KiB
JavaScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import * as l10n from '@vscode/l10n';
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import { TokenType, ScannerState } from '../htmlLanguageTypes';
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class MultiLineStream {
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constructor(source, position) {
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this.source = source;
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this.len = source.length;
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this.position = position;
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}
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eos() {
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return this.len <= this.position;
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}
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getSource() {
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return this.source;
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}
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pos() {
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return this.position;
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}
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goBackTo(pos) {
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this.position = pos;
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}
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goBack(n) {
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this.position -= n;
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}
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advance(n) {
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this.position += n;
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}
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goToEnd() {
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this.position = this.source.length;
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}
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nextChar() {
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return this.source.charCodeAt(this.position++) || 0;
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}
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peekChar(n = 0) {
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return this.source.charCodeAt(this.position + n) || 0;
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}
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advanceIfChar(ch) {
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if (ch === this.source.charCodeAt(this.position)) {
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this.position++;
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return true;
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}
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return false;
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}
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advanceIfChars(ch) {
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let i;
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if (this.position + ch.length > this.source.length) {
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return false;
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}
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for (i = 0; i < ch.length; i++) {
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if (this.source.charCodeAt(this.position + i) !== ch[i]) {
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return false;
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}
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}
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this.advance(i);
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return true;
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}
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advanceIfRegExp(regex) {
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const str = this.source.substr(this.position);
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const match = str.match(regex);
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if (match) {
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this.position = this.position + match.index + match[0].length;
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return match[0];
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}
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return '';
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}
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advanceUntilRegExp(regex) {
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const str = this.source.substr(this.position);
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const match = str.match(regex);
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if (match) {
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this.position = this.position + match.index;
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return match[0];
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}
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else {
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this.goToEnd();
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}
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return '';
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}
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advanceUntilChar(ch) {
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while (this.position < this.source.length) {
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if (this.source.charCodeAt(this.position) === ch) {
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return true;
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}
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this.advance(1);
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}
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return false;
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}
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advanceUntilChars(ch) {
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while (this.position + ch.length <= this.source.length) {
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let i = 0;
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for (; i < ch.length && this.source.charCodeAt(this.position + i) === ch[i]; i++) {
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}
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if (i === ch.length) {
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return true;
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}
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this.advance(1);
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}
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this.goToEnd();
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return false;
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}
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skipWhitespace() {
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const n = this.advanceWhileChar(ch => {
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return ch === _WSP || ch === _TAB || ch === _NWL || ch === _LFD || ch === _CAR;
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});
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return n > 0;
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}
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advanceWhileChar(condition) {
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const posNow = this.position;
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while (this.position < this.len && condition(this.source.charCodeAt(this.position))) {
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this.position++;
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}
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return this.position - posNow;
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}
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}
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const _BNG = '!'.charCodeAt(0);
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const _MIN = '-'.charCodeAt(0);
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const _LAN = '<'.charCodeAt(0);
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const _RAN = '>'.charCodeAt(0);
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const _FSL = '/'.charCodeAt(0);
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const _EQS = '='.charCodeAt(0);
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const _DQO = '"'.charCodeAt(0);
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const _SQO = '\''.charCodeAt(0);
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const _NWL = '\n'.charCodeAt(0);
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const _CAR = '\r'.charCodeAt(0);
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const _LFD = '\f'.charCodeAt(0);
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const _WSP = ' '.charCodeAt(0);
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const _TAB = '\t'.charCodeAt(0);
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const htmlScriptContents = {
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'text/x-handlebars-template': true,
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// Fix for https://github.com/microsoft/vscode/issues/77977
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'text/html': true,
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};
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export function createScanner(input, initialOffset = 0, initialState = ScannerState.WithinContent, emitPseudoCloseTags = false) {
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const stream = new MultiLineStream(input, initialOffset);
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let state = initialState;
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let tokenOffset = 0;
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let tokenType = TokenType.Unknown;
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let tokenError;
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let hasSpaceAfterTag;
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let lastTag;
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let lastAttributeName;
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let lastTypeValue;
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function nextElementName() {
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return stream.advanceIfRegExp(/^[_:\w][_:\w-.\d]*/).toLowerCase();
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}
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function nextAttributeName() {
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return stream.advanceIfRegExp(/^[^\s"'></=\x00-\x0F\x7F\x80-\x9F]*/).toLowerCase();
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}
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function finishToken(offset, type, errorMessage) {
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tokenType = type;
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tokenOffset = offset;
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tokenError = errorMessage;
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return type;
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}
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function scan() {
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const offset = stream.pos();
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const oldState = state;
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const token = internalScan();
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if (token !== TokenType.EOS && offset === stream.pos() && !(emitPseudoCloseTags && (token === TokenType.StartTagClose || token === TokenType.EndTagClose))) {
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console.warn('Scanner.scan has not advanced at offset ' + offset + ', state before: ' + oldState + ' after: ' + state);
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stream.advance(1);
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return finishToken(offset, TokenType.Unknown);
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}
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return token;
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}
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function internalScan() {
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const offset = stream.pos();
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if (stream.eos()) {
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return finishToken(offset, TokenType.EOS);
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}
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let errorMessage;
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switch (state) {
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case ScannerState.WithinComment:
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if (stream.advanceIfChars([_MIN, _MIN, _RAN])) { // -->
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state = ScannerState.WithinContent;
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return finishToken(offset, TokenType.EndCommentTag);
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}
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stream.advanceUntilChars([_MIN, _MIN, _RAN]); // -->
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return finishToken(offset, TokenType.Comment);
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case ScannerState.WithinDoctype:
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if (stream.advanceIfChar(_RAN)) {
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state = ScannerState.WithinContent;
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return finishToken(offset, TokenType.EndDoctypeTag);
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}
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stream.advanceUntilChar(_RAN); // >
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return finishToken(offset, TokenType.Doctype);
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case ScannerState.WithinContent:
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if (stream.advanceIfChar(_LAN)) { // <
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if (!stream.eos() && stream.peekChar() === _BNG) { // !
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if (stream.advanceIfChars([_BNG, _MIN, _MIN])) { // <!--
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state = ScannerState.WithinComment;
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return finishToken(offset, TokenType.StartCommentTag);
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}
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if (stream.advanceIfRegExp(/^!doctype/i)) {
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state = ScannerState.WithinDoctype;
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return finishToken(offset, TokenType.StartDoctypeTag);
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}
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}
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if (stream.advanceIfChar(_FSL)) { // /
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state = ScannerState.AfterOpeningEndTag;
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return finishToken(offset, TokenType.EndTagOpen);
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}
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state = ScannerState.AfterOpeningStartTag;
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return finishToken(offset, TokenType.StartTagOpen);
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}
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stream.advanceUntilChar(_LAN);
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return finishToken(offset, TokenType.Content);
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case ScannerState.AfterOpeningEndTag:
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const tagName = nextElementName();
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if (tagName.length > 0) {
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state = ScannerState.WithinEndTag;
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return finishToken(offset, TokenType.EndTag);
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}
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if (stream.skipWhitespace()) { // white space is not valid here
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return finishToken(offset, TokenType.Whitespace, l10n.t('Tag name must directly follow the open bracket.'));
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}
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state = ScannerState.WithinEndTag;
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stream.advanceUntilChar(_RAN);
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if (offset < stream.pos()) {
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return finishToken(offset, TokenType.Unknown, l10n.t('End tag name expected.'));
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}
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return internalScan();
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case ScannerState.WithinEndTag:
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if (stream.skipWhitespace()) { // white space is valid here
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return finishToken(offset, TokenType.Whitespace);
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}
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if (stream.advanceIfChar(_RAN)) { // >
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state = ScannerState.WithinContent;
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return finishToken(offset, TokenType.EndTagClose);
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}
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if (emitPseudoCloseTags && stream.peekChar() === _LAN) { // <
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state = ScannerState.WithinContent;
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return finishToken(offset, TokenType.EndTagClose, l10n.t('Closing bracket missing.'));
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}
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errorMessage = l10n.t('Closing bracket expected.');
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break;
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case ScannerState.AfterOpeningStartTag:
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lastTag = nextElementName();
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lastTypeValue = void 0;
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lastAttributeName = void 0;
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if (lastTag.length > 0) {
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hasSpaceAfterTag = false;
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state = ScannerState.WithinTag;
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return finishToken(offset, TokenType.StartTag);
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}
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if (stream.skipWhitespace()) { // white space is not valid here
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return finishToken(offset, TokenType.Whitespace, l10n.t('Tag name must directly follow the open bracket.'));
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}
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state = ScannerState.WithinTag;
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stream.advanceUntilChar(_RAN);
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if (offset < stream.pos()) {
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return finishToken(offset, TokenType.Unknown, l10n.t('Start tag name expected.'));
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}
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return internalScan();
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case ScannerState.WithinTag:
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if (stream.skipWhitespace()) {
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hasSpaceAfterTag = true; // remember that we have seen a whitespace
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return finishToken(offset, TokenType.Whitespace);
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}
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if (hasSpaceAfterTag) {
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lastAttributeName = nextAttributeName();
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if (lastAttributeName.length > 0) {
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state = ScannerState.AfterAttributeName;
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hasSpaceAfterTag = false;
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return finishToken(offset, TokenType.AttributeName);
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}
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}
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if (stream.advanceIfChars([_FSL, _RAN])) { // />
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state = ScannerState.WithinContent;
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return finishToken(offset, TokenType.StartTagSelfClose);
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}
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if (stream.advanceIfChar(_RAN)) { // >
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if (lastTag === 'script') {
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if (lastTypeValue && htmlScriptContents[lastTypeValue]) {
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// stay in html
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state = ScannerState.WithinContent;
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}
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else {
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state = ScannerState.WithinScriptContent;
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}
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}
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else if (lastTag === 'style') {
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state = ScannerState.WithinStyleContent;
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}
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else {
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state = ScannerState.WithinContent;
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}
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return finishToken(offset, TokenType.StartTagClose);
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}
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if (emitPseudoCloseTags && stream.peekChar() === _LAN) { // <
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state = ScannerState.WithinContent;
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return finishToken(offset, TokenType.StartTagClose, l10n.t('Closing bracket missing.'));
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}
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stream.advance(1);
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return finishToken(offset, TokenType.Unknown, l10n.t('Unexpected character in tag.'));
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case ScannerState.AfterAttributeName:
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if (stream.skipWhitespace()) {
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hasSpaceAfterTag = true;
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return finishToken(offset, TokenType.Whitespace);
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}
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if (stream.advanceIfChar(_EQS)) {
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state = ScannerState.BeforeAttributeValue;
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return finishToken(offset, TokenType.DelimiterAssign);
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}
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state = ScannerState.WithinTag;
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return internalScan(); // no advance yet - jump to WithinTag
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case ScannerState.BeforeAttributeValue:
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if (stream.skipWhitespace()) {
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return finishToken(offset, TokenType.Whitespace);
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}
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let attributeValue = stream.advanceIfRegExp(/^[^\s"'`=<>]+/);
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if (attributeValue.length > 0) {
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if (stream.peekChar() === _RAN && stream.peekChar(-1) === _FSL) { // <foo bar=http://foo/>
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stream.goBack(1);
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attributeValue = attributeValue.substring(0, attributeValue.length - 1);
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}
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if (lastAttributeName === 'type') {
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lastTypeValue = attributeValue;
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}
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if (attributeValue.length > 0) {
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state = ScannerState.WithinTag;
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hasSpaceAfterTag = false;
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return finishToken(offset, TokenType.AttributeValue);
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}
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}
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const ch = stream.peekChar();
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if (ch === _SQO || ch === _DQO) {
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stream.advance(1); // consume quote
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if (stream.advanceUntilChar(ch)) {
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stream.advance(1); // consume quote
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}
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if (lastAttributeName === 'type') {
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lastTypeValue = stream.getSource().substring(offset + 1, stream.pos() - 1);
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}
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state = ScannerState.WithinTag;
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hasSpaceAfterTag = false;
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return finishToken(offset, TokenType.AttributeValue);
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}
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state = ScannerState.WithinTag;
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hasSpaceAfterTag = false;
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return internalScan(); // no advance yet - jump to WithinTag
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case ScannerState.WithinScriptContent:
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// see http://stackoverflow.com/questions/14574471/how-do-browsers-parse-a-script-tag-exactly
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let sciptState = 1;
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while (!stream.eos()) {
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const match = stream.advanceIfRegExp(/<!--|-->|<\/?script\s*\/?>?/i);
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if (match.length === 0) {
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stream.goToEnd();
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return finishToken(offset, TokenType.Script);
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}
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else if (match === '<!--') {
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if (sciptState === 1) {
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sciptState = 2;
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}
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}
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else if (match === '-->') {
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sciptState = 1;
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}
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else if (match[1] !== '/') { // <script
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if (sciptState === 2) {
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sciptState = 3;
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}
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}
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else { // </script
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if (sciptState === 3) {
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sciptState = 2;
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}
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else {
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stream.goBack(match.length); // to the beginning of the closing tag
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break;
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}
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}
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}
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state = ScannerState.WithinContent;
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if (offset < stream.pos()) {
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return finishToken(offset, TokenType.Script);
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}
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return internalScan(); // no advance yet - jump to content
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case ScannerState.WithinStyleContent:
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stream.advanceUntilRegExp(/<\/style/i);
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state = ScannerState.WithinContent;
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if (offset < stream.pos()) {
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return finishToken(offset, TokenType.Styles);
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}
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return internalScan(); // no advance yet - jump to content
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}
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stream.advance(1);
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state = ScannerState.WithinContent;
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return finishToken(offset, TokenType.Unknown, errorMessage);
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}
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return {
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scan,
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getTokenType: () => tokenType,
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getTokenOffset: () => tokenOffset,
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getTokenLength: () => stream.pos() - tokenOffset,
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getTokenEnd: () => stream.pos(),
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getTokenText: () => stream.getSource().substring(tokenOffset, stream.pos()),
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getScannerState: () => state,
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getTokenError: () => tokenError
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};
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}
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