/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
import { createScanner } from '../parser/htmlScanner';
import { TokenType, DocumentHighlightKind } from '../htmlLanguageTypes';
export function findDocumentHighlights(document, position, htmlDocument) {
    const offset = document.offsetAt(position);
    const node = htmlDocument.findNodeAt(offset);
    if (!node.tag) {
        return [];
    }
    const result = [];
    const startTagRange = getTagNameRange(TokenType.StartTag, document, node.start);
    const endTagRange = typeof node.endTagStart === 'number' && getTagNameRange(TokenType.EndTag, document, node.endTagStart);
    if (startTagRange && covers(startTagRange, position) || endTagRange && covers(endTagRange, position)) {
        if (startTagRange) {
            result.push({ kind: DocumentHighlightKind.Read, range: startTagRange });
        }
        if (endTagRange) {
            result.push({ kind: DocumentHighlightKind.Read, range: endTagRange });
        }
    }
    return result;
}
function isBeforeOrEqual(pos1, pos2) {
    return pos1.line < pos2.line || (pos1.line === pos2.line && pos1.character <= pos2.character);
}
function covers(range, position) {
    return isBeforeOrEqual(range.start, position) && isBeforeOrEqual(position, range.end);
}
function getTagNameRange(tokenType, document, startOffset) {
    const scanner = createScanner(document.getText(), startOffset);
    let token = scanner.scan();
    while (token !== TokenType.EOS && token !== tokenType) {
        token = scanner.scan();
    }
    if (token !== TokenType.EOS) {
        return { start: document.positionAt(scanner.getTokenOffset()), end: document.positionAt(scanner.getTokenEnd()) };
    }
    return null;
}