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// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
import $ from 'jquery';
import PropTypes from 'prop-types';
import React from 'react';
import * as SyntaxHighlighting from 'utils/syntax_highlighting.jsx';
import Constants from 'utils/constants.jsx';
import FileInfoPreview from './file_info_preview.jsx';
import loadingGif from 'images/load.gif';
export default class CodePreview extends React.Component {
constructor(props) {
super(props);
this.updateStateFromProps = this.updateStateFromProps.bind(this);
this.handleReceivedError = this.handleReceivedError.bind(this);
this.handleReceivedCode = this.handleReceivedCode.bind(this);
this.state = {
code: '',
lang: '',
loading: true,
success: true
};
}
componentDidMount() {
this.updateStateFromProps(this.props);
}
componentWillReceiveProps(nextProps) {
if (this.props.fileUrl !== nextProps.fileUrl) {
this.updateStateFromProps(nextProps);
}
}
updateStateFromProps(props) {
const usedLanguage = SyntaxHighlighting.getLanguageFromFileExtension(props.fileInfo.extension);
if (!usedLanguage || props.fileInfo.size > Constants.CODE_PREVIEW_MAX_FILE_SIZE) {
this.setState({code: '', lang: '', loading: false, success: false});
return;
}
this.setState({code: '', lang: usedLanguage, loading: true});
$.ajax({
async: true,
url: props.fileUrl,
type: 'GET',
dataType: 'text',
error: this.handleReceivedError,
success: this.handleReceivedCode
});
}
handleReceivedCode(data) {
let code = data;
if (data.nodeName === '#document') {
code = new XMLSerializer().serializeToString(data);
}
this.setState({
code,
loading: false,
success: true
});
}
handleReceivedError() {
this.setState({loading: false, success: false});
}
static supports(fileInfo) {
return Boolean(SyntaxHighlighting.getLanguageFromFileExtension(fileInfo.extension));
}
render() {
if (this.state.loading) {
return (
<div className='view-image__loading'>
<img
className='loader-image'
src={loadingGif}
/>
</div>
);
}
if (!this.state.success) {
return (
<FileInfoPreview
fileInfo={this.props.fileInfo}
fileUrl={this.props.fileUrl}
/>
);
}
// add line numbers when viewing a code file preview
const lines = this.state.code.match(/\r\n|\r|\n|$/g).length;
let strlines = '';
for (let i = 1; i <= lines; i++) {
if (strlines) {
strlines += '\n' + i;
} else {
strlines += i;
}
}
const language = SyntaxHighlighting.getLanguageName(this.state.lang);
const highlighted = SyntaxHighlighting.highlight(this.state.lang, this.state.code);
return (
<div className='post-code'>
<span className='post-code__language'>
{`${this.props.fileInfo.name} - ${language}`}
</span>
<div className='post-code__container'>
<code className='hljs'>
<table>
<tbody>
<tr>
<td className='post-code__lineno'>{strlines}</td>
<td dangerouslySetInnerHTML={{__html: highlighted}}/>
</tr>
</tbody>
</table>
</code>
</div>
</div>
);
}
}
CodePreview.propTypes = {
fileInfo: PropTypes.object.isRequired,
fileUrl: PropTypes.string.isRequired
};
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