1 files changed, 329 insertions, 3 deletions
diff --git a/cli/js/web/performance.ts b/cli/js/web/performance.ts
index 67f8f1b6c..eb0479b37 100644
--- a/cli/js/web/performance.ts
+++ b/cli/js/web/performance.ts
@@ -1,10 +1,336 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
 import { now as opNow } from "../ops/timers.ts";
+import { customInspect, inspect } from "./console.ts";
+import { cloneValue, setFunctionName } from "./util.ts";
+
+let performanceEntries: PerformanceEntryList = [];
+
+function findMostRecent(
+  name: string,
+  type: "mark" | "measure"
+): PerformanceEntry | undefined {
+  return performanceEntries
+    .slice()
+    .reverse()
+    .find((entry) => entry.name === name && entry.entryType === type);
+}
+
+function convertMarkToTimestamp(mark: string | number): number {
+  if (typeof mark === "string") {
+    const entry = findMostRecent(mark, "mark");
+    if (!entry) {
+      throw new SyntaxError(`Cannot find mark: "${mark}".`);
+    }
+    return entry.startTime;
+  }
+  if (mark < 0) {
+    throw new TypeError("Mark cannot be negative.");
+  }
+  return mark;
+}
+
+function filterByNameType(
+  name?: string,
+  type?: "mark" | "measure"
+): PerformanceEntryList {
+  return performanceEntries.filter(
+    (entry) =>
+      (name ? entry.name === name : true) &&
+      (type ? entry.entryType === type : true)
+  );
+}
+
+function now(): number {
+  const res = opNow();
+  return res.seconds * 1e3 + res.subsecNanos / 1e6;
+}
+
+export class PerformanceEntryImpl implements PerformanceEntry {
+  #name: string;
+  #entryType: string;
+  #startTime: number;
+  #duration: number;
+
+  get name(): string {
+    return this.#name;
+  }
+
+  get entryType(): string {
+    return this.#entryType;
+  }
+
+  get startTime(): number {
+    return this.#startTime;
+  }
+
+  get duration(): number {
+    return this.#duration;
+  }
+
+  constructor(
+    name: string,
+    entryType: string,
+    startTime: number,
+    duration: number
+  ) {
+    this.#name = name;
+    this.#entryType = entryType;
+    this.#startTime = startTime;
+    this.#duration = duration;
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  toJSON(): any {
+    return {
+      name: this.#name,
+      entryType: this.#entryType,
+      startTime: this.#startTime,
+      duration: this.#duration,
+    };
+  }
+
+  [customInspect](): string {
+    return `${this.constructor.name} { name: "${this.name}", entryType: "${this.entryType}", startTime: ${this.startTime}, duration: ${this.duration} }`;
+  }
+}
+
+export class PerformanceMarkImpl extends PerformanceEntryImpl
+  implements PerformanceMark {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  #detail: any;
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  get detail(): any {
+    return this.#detail;
+  }
+
+  get entryType(): "mark" {
+    return "mark";
+  }
+
+  constructor(
+    name: string,
+    { detail = null, startTime = now() }: PerformanceMarkOptions = {}
+  ) {
+    super(name, "mark", startTime, 0);
+    if (startTime < 0) {
+      throw new TypeError("startTime cannot be negative");
+    }
+    this.#detail = cloneValue(detail);
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  toJSON(): any {
+    return {
+      name: this.name,
+      entryType: this.entryType,
+      startTime: this.startTime,
+      duration: this.duration,
+      detail: this.detail,
+    };
+  }
+
+  [customInspect](): string {
+    return this.detail
+      ? `${this.constructor.name} {\n  detail: ${inspect(this.detail, {
+          depth: 3,
+        })},\n  name: "${this.name}",\n  entryType: "${
+          this.entryType
+        }",\n  startTime: ${this.startTime},\n  duration: ${this.duration}\n}`
+      : `${this.constructor.name} { detail: ${this.detail}, name: "${this.name}", entryType: "${this.entryType}", startTime: ${this.startTime}, duration: ${this.duration} }`;
+  }
+}
+
+export class PerformanceMeasureImpl extends PerformanceEntryImpl
+  implements PerformanceMeasure {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  #detail: any;
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  get detail(): any {
+    return this.#detail;
+  }
+
+  get entryType(): "measure" {
+    return "measure";
+  }
+
+  constructor(
+    name: string,
+    startTime: number,
+    duration: number,
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    detail: any = null
+  ) {
+    super(name, "measure", startTime, duration);
+    this.#detail = cloneValue(detail);
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  toJSON(): any {
+    return {
+      name: this.name,
+      entryType: this.entryType,
+      startTime: this.startTime,
+      duration: this.duration,
+      detail: this.detail,
+    };
+  }
+
+  [customInspect](): string {
+    return this.detail
+      ? `${this.constructor.name} {\n  detail: ${inspect(this.detail, {
+          depth: 3,
+        })},\n  name: "${this.name}",\n  entryType: "${
+          this.entryType
+        }",\n  startTime: ${this.startTime},\n  duration: ${this.duration}\n}`
+      : `${this.constructor.name} { detail: ${this.detail}, name: "${this.name}", entryType: "${this.entryType}", startTime: ${this.startTime}, duration: ${this.duration} }`;
+  }
+}
+
+export class PerformanceImpl implements Performance {
+  clearMarks(markName?: string): void {
+    if (markName == null) {
+      performanceEntries = performanceEntries.filter(
+        (entry) => entry.entryType !== "mark"
+      );
+    } else {
+      performanceEntries = performanceEntries.filter(
+        (entry) => !(entry.name === markName && entry.entryType === "mark")
+      );
+    }
+  }
+
+  clearMeasures(measureName?: string): void {
+    if (measureName == null) {
+      performanceEntries = performanceEntries.filter(
+        (entry) => entry.entryType !== "measure"
+      );
+    } else {
+      performanceEntries = performanceEntries.filter(
+        (entry) =>
+          !(entry.name === measureName && entry.entryType === "measure")
+      );
+    }
+  }
+
+  getEntries(): PerformanceEntryList {
+    return filterByNameType();
+  }
+  getEntriesByName(
+    name: string,
+    type?: "mark" | "measure"
+  ): PerformanceEntryList {
+    return filterByNameType(name, type);
+  }
+  getEntriesByType(type: "mark" | "measure"): PerformanceEntryList {
+    return filterByNameType(undefined, type);
+  }
+
+  mark(
+    markName: string,
+    options: PerformanceMarkOptions = {}
+  ): PerformanceMark {
+    // 3.1.1.1 If the global object is a Window object and markName uses the
+    // same name as a read only attribute in the PerformanceTiming interface,
+    // throw a SyntaxError. - not implemented
+    const entry = new PerformanceMarkImpl(markName, options);
+    // 3.1.1.7 Queue entry - not implemented
+    performanceEntries.push(entry);
+    return entry;
+  }
+
+  measure(
+    measureName: string,
+    options?: PerformanceMeasureOptions
+  ): PerformanceMeasure;
+  measure(
+    measureName: string,
+    startMark?: string,
+    endMark?: string
+  ): PerformanceMeasure;
+  measure(
+    measureName: string,
+    startOrMeasureOptions: string | PerformanceMeasureOptions = {},
+    endMark?: string
+  ): PerformanceMeasure {
+    if (startOrMeasureOptions && typeof startOrMeasureOptions === "object") {
+      if (endMark) {
+        throw new TypeError("Options cannot be passed with endMark.");
+      }
+      if (
+        !("start" in startOrMeasureOptions) &&
+        !("end" in startOrMeasureOptions)
+      ) {
+        throw new TypeError("A start or end mark must be supplied in options.");
+      }
+      if (
+        "start" in startOrMeasureOptions &&
+        "duration" in startOrMeasureOptions &&
+        "end" in startOrMeasureOptions
+      ) {
+        throw new TypeError(
+          "Cannot specify start, end, and duration together in options."
+        );
+      }
+    }
+    let endTime: number;
+    if (endMark) {
+      endTime = convertMarkToTimestamp(endMark);
+    } else if (
+      typeof startOrMeasureOptions === "object" &&
+      "end" in startOrMeasureOptions
+    ) {
+      endTime = convertMarkToTimestamp(startOrMeasureOptions.end!);
+    } else if (
+      typeof startOrMeasureOptions === "object" &&
+      "start" in startOrMeasureOptions &&
+      "duration" in startOrMeasureOptions
+    ) {
+      const start = convertMarkToTimestamp(startOrMeasureOptions.start!);
+      const duration = convertMarkToTimestamp(startOrMeasureOptions.duration!);
+      endTime = start + duration;
+    } else {
+      endTime = now();
+    }
+    let startTime: number;
+    if (
+      typeof startOrMeasureOptions === "object" &&
+      "start" in startOrMeasureOptions
+    ) {
+      startTime = convertMarkToTimestamp(startOrMeasureOptions.start!);
+    } else if (
+      typeof startOrMeasureOptions === "object" &&
+      "end" in startOrMeasureOptions &&
+      "duration" in startOrMeasureOptions
+    ) {
+      const end = convertMarkToTimestamp(startOrMeasureOptions.end!);
+      const duration = convertMarkToTimestamp(startOrMeasureOptions.duration!);
+      startTime = end - duration;
+    } else if (typeof startOrMeasureOptions === "string") {
+      startTime = convertMarkToTimestamp(startOrMeasureOptions);
+    } else {
+      startTime = 0;
+    }
+    const entry = new PerformanceMeasureImpl(
+      measureName,
+      startTime,
+      endTime - startTime,
+      typeof startOrMeasureOptions === "object"
+        ? startOrMeasureOptions.detail ?? null
+        : null
+    );
+    performanceEntries.push(entry);
+    return entry;
+  }
 
-export class Performance {
   now(): number {
-    const res = opNow();
-    return res.seconds * 1e3 + res.subsecNanos / 1e6;
+    return now();
   }
 }
+
+setFunctionName(PerformanceEntryImpl, "PerformanceEntry");
+setFunctionName(PerformanceMarkImpl, "PerformanceMark");
+setFunctionName(PerformanceMeasureImpl, "PerformanceMeasure");
+setFunctionName(PerformanceImpl, "Performance");