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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
// Diagnostic provides an abstraction for advice/errors received from a
// compiler, which is strongly influenced by the format of TypeScript
// diagnostics.
/** The log category for a diagnostic message */
export enum DiagnosticCategory {
Log = 0,
Debug = 1,
Info = 2,
Error = 3,
Warning = 4,
Suggestion = 5
}
export interface DiagnosticMessageChain {
message: string;
category: DiagnosticCategory;
code: number;
next?: DiagnosticMessageChain[];
}
export interface DiagnosticItem {
/** A string message summarizing the diagnostic. */
message: string;
/** An ordered array of further diagnostics. */
messageChain?: DiagnosticMessageChain;
/** Information related to the diagnostic. This is present when there is a
* suggestion or other additional diagnostic information */
relatedInformation?: DiagnosticItem[];
/** The text of the source line related to the diagnostic */
sourceLine?: string;
/** The line number that is related to the diagnostic */
lineNumber?: number;
/** The name of the script resource related to the diagnostic */
scriptResourceName?: string;
/** The start position related to the diagnostic */
startPosition?: number;
/** The end position related to the diagnostic */
endPosition?: number;
/** The category of the diagnostic */
category: DiagnosticCategory;
/** A number identifier */
code: number;
/** The the start column of the sourceLine related to the diagnostic */
startColumn?: number;
/** The end column of the sourceLine related to the diagnostic */
endColumn?: number;
}
export interface Diagnostic {
/** An array of diagnostic items. */
items: DiagnosticItem[];
}
interface SourceInformation {
sourceLine: string;
lineNumber: number;
scriptResourceName: string;
startColumn: number;
endColumn: number;
}
function fromDiagnosticCategory(
category: ts.DiagnosticCategory
): DiagnosticCategory {
switch (category) {
case ts.DiagnosticCategory.Error:
return DiagnosticCategory.Error;
case ts.DiagnosticCategory.Message:
return DiagnosticCategory.Info;
case ts.DiagnosticCategory.Suggestion:
return DiagnosticCategory.Suggestion;
case ts.DiagnosticCategory.Warning:
return DiagnosticCategory.Warning;
default:
throw new Error(
`Unexpected DiagnosticCategory: "${category}"/"${
ts.DiagnosticCategory[category]
}"`
);
}
}
function getSourceInformation(
sourceFile: ts.SourceFile,
start: number,
length: number
): SourceInformation {
const scriptResourceName = sourceFile.fileName;
const {
line: lineNumber,
character: startColumn
} = sourceFile.getLineAndCharacterOfPosition(start);
const endPosition = sourceFile.getLineAndCharacterOfPosition(start + length);
const endColumn =
lineNumber === endPosition.line ? endPosition.character : startColumn;
const lastLineInFile = sourceFile.getLineAndCharacterOfPosition(
sourceFile.text.length
).line;
const lineStart = sourceFile.getPositionOfLineAndCharacter(lineNumber, 0);
const lineEnd =
lineNumber < lastLineInFile
? sourceFile.getPositionOfLineAndCharacter(lineNumber + 1, 0)
: sourceFile.text.length;
const sourceLine = sourceFile.text
.slice(lineStart, lineEnd)
.replace(/\s+$/g, "")
.replace("\t", " ");
return {
sourceLine,
lineNumber,
scriptResourceName,
startColumn,
endColumn
};
}
/** Converts a TypeScript diagnostic message chain to a Deno one. */
function fromDiagnosticMessageChain(
messageChain: ts.DiagnosticMessageChain[] | undefined
): DiagnosticMessageChain[] | undefined {
if (!messageChain) {
return undefined;
}
return messageChain.map(({ messageText: message, code, category, next }) => {
return {
message,
code,
category: fromDiagnosticCategory(category),
next: fromDiagnosticMessageChain(next)
};
});
}
/** Parse out information from a TypeScript diagnostic structure. */
function parseDiagnostic(
item: ts.Diagnostic | ts.DiagnosticRelatedInformation
): DiagnosticItem {
const {
messageText,
category: sourceCategory,
code,
file,
start: startPosition,
length
} = item;
const sourceInfo =
file && startPosition && length
? getSourceInformation(file, startPosition, length)
: undefined;
const endPosition =
startPosition && length ? startPosition + length : undefined;
const category = fromDiagnosticCategory(sourceCategory);
let message: string;
let messageChain: DiagnosticMessageChain | undefined;
if (typeof messageText === "string") {
message = messageText;
} else {
message = messageText.messageText;
messageChain = fromDiagnosticMessageChain([messageText])![0];
}
const base = {
message,
messageChain,
code,
category,
startPosition,
endPosition
};
return sourceInfo ? { ...base, ...sourceInfo } : base;
}
/** Convert a diagnostic related information array into a Deno diagnostic
* array. */
function parseRelatedInformation(
relatedInformation: readonly ts.DiagnosticRelatedInformation[]
): DiagnosticItem[] {
const result: DiagnosticItem[] = [];
for (const item of relatedInformation) {
result.push(parseDiagnostic(item));
}
return result;
}
/** Convert TypeScript diagnostics to Deno diagnostics. */
export function fromTypeScriptDiagnostic(
diagnostics: readonly ts.Diagnostic[]
): Diagnostic {
const items: DiagnosticItem[] = [];
for (const sourceDiagnostic of diagnostics) {
const item: DiagnosticItem = parseDiagnostic(sourceDiagnostic);
if (sourceDiagnostic.relatedInformation) {
item.relatedInformation = parseRelatedInformation(
sourceDiagnostic.relatedInformation
);
}
items.push(item);
}
return { items };
}
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