import { window , OutputChannel } from 'vscode' ; export type LogLevel = 'TRACE' | 'DEBUG' | 'INFO' | 'WARN' | 'ERROR' | 'NONE' ; export class LoggingService implements OutputChannel { private outputChannel = window . createOutputChannel ( 'Psalm Language Server' ) ; private logLevel : LogLevel = 'DEBUG' ; private content : string [ ] = [ ] ; private contentLimit = 1000 ; readonly name : string = 'Psalm Language Server' ; param value replace ( value ) { this . content = [ value ] ; this . outputChannel . replace ( value ) ; } param value append ( value ) { this . content . push ( value ) ; this . content = this . content . slice ( - this . contentLimit ) ; this . outputChannel . append ( value ) ; } param value appendLine ( value ) { this . content . push ( value ) ; this . content = this . content . slice ( - this . contentLimit ) ; this . outputChannel . appendLine ( value ) ; } /**
     * Removes all output from the channel.
     */ clear ( ) { this . content = [ ] ; this . outputChannel . clear ( ) ; } param preserveFocus show ( ) { this . outputChannel . show ( ... arguments ) ; } /**
     * Hide this channel from the UI.
     */ hide ( ) { this . outputChannel . hide ( ) ; } /**
     * Dispose and free associated resources.
     */ dispose ( ) { this . outputChannel . dispose ( ) ; } public setOutputLevel ( logLevel ) { this . logLevel = logLevel ; } public getOutputLevel ( ) { return this . logLevel ; } public logTrace ( message , data ? ) { if ( this . logLevel === 'NONE' || this . logLevel === 'INFO' || this . logLevel === 'WARN' || this . logLevel === 'ERROR' || this . logLevel === 'DEBUG' ) { return ; } this . logMessage ( message , 'TRACE' ) ; if ( data ) { this . logObject ( data ) ; } } param message public logDebug ( message , data ? ) { if ( this . logLevel === 'NONE' || this . logLevel === 'INFO' || this . logLevel === 'WARN' || this . logLevel === 'ERROR' ) { return ; } this . logMessage ( message , 'DEBUG' ) ; if ( data ) { this . logObject ( data ) ; } } param message public logInfo ( message , data ? ) { if ( this . logLevel === 'NONE' || this . logLevel === 'WARN' || this . logLevel === 'ERROR' ) { return ; } this . logMessage ( message , 'INFO' ) ; if ( data ) { this . logObject ( data ) ; } } param message public logWarning ( message , data ? ) { if ( this . logLevel === 'NONE' || this . logLevel === 'ERROR' ) { return ; } this . logMessage ( message , 'WARN' ) ; if ( data ) { this . logObject ( data ) ; } } public logError ( message , error ? ) { if ( this . logLevel === 'NONE' ) { return ; } this . logMessage ( message , 'ERROR' ) ; if ( typeof error === 'string' ) { this . appendLine ( error ) ; } else if ( error ?. message || error ?. stack ) { if ( error ?. message ) { this . logMessage ( error . message , 'ERROR' ) ; } if ( error ?. stack ) { this . appendLine ( error . stack ) ; } } else if ( error ) { this . logObject ( error ) ; } } public getContent ( ) { return this . content ; } private logObject ( data ) { this . appendLine ( JSON . stringify ( data , null , 2 ) ) ; } param message private logMessage ( message , logLevel ) { const title = new Date ( ) . toLocaleTimeString ( ) ; this . appendLine ( `[${ logLevel } - ${ title }] ${ message }` ) ; } }