pprof/internal/driver/webhtml.go

// Copyright 2017 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package driver

import "html/template"

// addTemplates adds a set of template definitions to templates.
func addTemplates(templates *template.Template) {
	template.Must(templates.Parse(`
{{define "css"}}
<style type="text/css">
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html, body {
  height: 100%;
}
body {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  font-size: 13px;
  line-height: 1.4;
  display: flex;
  flex-direction: column;
}
a {
  color: #2a66d9;
}
.header {
  display: flex;
  align-items: center;
  height: 44px;
  min-height: 44px;
  background-color: #eee;
  color: #212121;
  padding: 0 1rem;
}
.header > div {
  margin: 0 0.125em;
}
.header .title h1 {
  font-size: 1.75em;
  margin-right: 1rem;
}
.header .title a {
  color: #212121;
  text-decoration: none;
}
.header .title a:hover {
  text-decoration: underline;
}
.header .description {
  width: 100%;
  text-align: right;
  white-space: nowrap;
}
@media screen and (max-width: 799px) {
	.header input {
		display: none;
	}
}
#detailsbox {
  display: none;
  z-index: 1;
  position: fixed;
  top: 40px;
  right: 20px;
  background-color: #ffffff;
  box-shadow: 0 1px 5px rgba(0,0,0,.3);
  line-height: 24px;
  padding: 1em;
  text-align: left;
}
.header input {
  background: white url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' style='pointer-events:none;display:block;width:100%25;height:100%25;fill:#757575'%3E%3Cpath d='M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61.0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z'/%3E%3C/svg%3E") no-repeat 4px center/20px 20px;
  border: 1px solid #d1d2d3;
  border-radius: 2px 0 0 2px;
  padding: 0.25em;
  padding-left: 28px;
  margin-left: 1em;
  font-family: 'Roboto', 'Noto', sans-serif;
  font-size: 1em;
  line-height: 24px;
  color: #212121;
}
.downArrow {
  border-top: .36em solid #ccc;
  border-left: .36em solid transparent;
  border-right: .36em solid transparent;
  margin-bottom: .05em;
  margin-left: .5em;
  transition: border-top-color 200ms;
}
.menu-item {
  height: 100%;
  text-transform: uppercase;
  font-family: 'Roboto Medium', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  position: relative;
}
.menu-item.disabled {
  opacity: 0.5;
}
.menu-item .menu-name:hover {
  opacity: 0.75;
}
.menu-item .menu-name:hover .downArrow {
  border-top-color: #666;
}
.menu-item.disabled .menu-name:hover {
  opacity: 1;
}
.menu-item.disabled .menu-name:hover .downArrow {
  border-top-color: #ccc;
}
.menu-name {
  height: 100%;
  padding: 0 0.5em;
  display: flex;
  align-items: center;
  justify-content: center;
}
.submenu {
  display: none;
  z-index: 1;
  margin-top: -4px;
  min-width: 10em;
  position: absolute;
  left: 0px;
  background-color: white;
  box-shadow: 0 1px 5px rgba(0,0,0,.3);
  font-size: 100%;
  text-transform: none;
}
.menu-item, .submenu {
  user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-user-select: none;
}
.submenu hr {
  border: 0;
  border-top: 2px solid #eee;
}
.submenu a {
  display: block;
  padding: .5em 1em;
  text-decoration: none;
}
.submenu a:hover, .submenu a.active {
  color: white;
  background-color: #6b82d6;
}
.submenu a.disabled {
  color: gray;
  pointer-events: none;
}

#content {
  overflow-y: scroll;
  padding: 1em;
}
#top {
  overflow-y: scroll;
}
#graph {
  overflow: hidden;
}
#graph svg {
  width: 100%;
  height: auto;
  padding: 10px;
}
#content.source .filename {
  margin-top: 0;
  margin-bottom: 1em;
  font-size: 120%;
}
#content.source pre {
  margin-bottom: 3em;
}
table {
  border-spacing: 0px;
  width: 100%;
  padding-bottom: 1em;
  white-space: nowrap;
}
table thead {
  font-family: 'Roboto Medium', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
}
table tr th {
  background-color: #ddd;
  text-align: right;
  padding: .3em .5em;
}
table tr td {
  padding: .3em .5em;
  text-align: right;
}
#top table tr th:nth-child(6),
#top table tr th:nth-child(7),
#top table tr td:nth-child(6),
#top table tr td:nth-child(7) {
  text-align: left;
}
#top table tr td:nth-child(6) {
  width: 100%;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}
#flathdr1, #flathdr2, #cumhdr1, #cumhdr2, #namehdr {
  cursor: ns-resize;
}
.hilite {
  background-color: #ebf5fb; 
  font-weight: bold;
}
</style>
{{end}}

{{define "header"}}
<div class="header">
<div class="title">
<h1><a href="/">pprof</a></h1>
</div>

<div id="view" class="menu-item">
<div class="menu-name">
View
<i class="downArrow"></i>
</div>
<div class="submenu">
<a title="{{.Help.top}}"  href="/top" id="topbtn">Top</a>
<a title="{{.Help.graph}}" href="/" id="graphbtn">Graph</a>
<a title="{{.Help.peek}}" href="/peek" id="peek">Peek</a>
<a title="{{.Help.list}}" href="/source" id="list">Source</a>
<a title="{{.Help.disasm}}" href="/disasm" id="disasm">Disassemble</a>
</div>
</div>

<div id="refine" class="menu-item disabled">
<div class="menu-name">
Refine
<i class="downArrow"></i>
</div>
<div class="submenu">
<a title="{{.Help.focus}}" href="{{.BaseURL}}" id="focus">Focus</a>
<a title="{{.Help.ignore}}" href="{{.BaseURL}}" id="ignore">Ignore</a>
<a title="{{.Help.hide}}" href="{{.BaseURL}}" id="hide">Hide</a>
<a title="{{.Help.show}}" href="{{.BaseURL}}" id="show">Show</a>
<hr>
<a title="{{.Help.reset}}" href="{{.BaseURL}}">Reset</a>
</div>
</div>

<div>
<input id="search" type="text" placeholder="Search regexp" autocomplete="off" autocapitalize="none" size=40>
</div>

<div class="description">
<a title="{{.Help.details}}" href="#" id="details">{{.Title}}</a>
<div id="detailsbox">
{{range .Legend}}<div>{{.}}</div>{{end}}
</div>
</div>
</div>

<div id="errors">{{range .Errors}}<div>{{.}}</div>{{end}}</div>
{{end}}

{{define "graph" -}}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>{{.Title}}</title>
{{template "css" .}}
</head>
<body>
{{template "header" .}}
<div id="graph">
{{.HTMLBody}}
</div>
{{template "script" .}}
<script>viewer({{.BaseURL}}, {{.Nodes}})</script>
</body>
</html>
{{end}}

{{define "script"}}
<script>
// Make svg pannable and zoomable.
// Call clickHandler(t) if a click event is caught by the pan event handlers.
function initPanAndZoom(svg, clickHandler) {
  'use strict';

  // Current mouse/touch handling mode
  const IDLE = 0
  const MOUSEPAN = 1
  const TOUCHPAN = 2
  const TOUCHZOOM = 3
  let mode = IDLE

  // State needed to implement zooming.
  let currentScale = 1.0
  const initWidth = svg.viewBox.baseVal.width
  const initHeight = svg.viewBox.baseVal.height

  // State needed to implement panning.
  let panLastX = 0      // Last event X coordinate
  let panLastY = 0      // Last event Y coordinate
  let moved = false     // Have we seen significant movement
  let touchid = null    // Current touch identifier

  // State needed for pinch zooming
  let touchid2 = null     // Second id for pinch zooming
  let initGap = 1.0       // Starting gap between two touches
  let initScale = 1.0     // currentScale when pinch zoom started
  let centerPoint = null  // Center point for scaling

  // Convert event coordinates to svg coordinates.
  function toSvg(x, y) {
    const p = svg.createSVGPoint()
    p.x = x
    p.y = y
    let m = svg.getCTM()
    if (m == null) m = svg.getScreenCTM()  // Firefox workaround.
    return p.matrixTransform(m.inverse())
  }

  // Change the scaling for the svg to s, keeping the point denoted
  // by u (in svg coordinates]) fixed at the same screen location.
  function rescale(s, u) {
    // Limit to a good range.
    if (s < 0.2) s = 0.2
    if (s > 10.0) s = 10.0

    currentScale = s

    // svg.viewBox defines the visible portion of the user coordinate
    // system.  So to magnify by s, divide the visible portion by s,
    // which will then be stretched to fit the viewport.
    const vb = svg.viewBox
    const w1 = vb.baseVal.width
    const w2 = initWidth / s
    const h1 = vb.baseVal.height
    const h2 = initHeight / s
    vb.baseVal.width = w2
    vb.baseVal.height = h2

    // We also want to adjust vb.baseVal.x so that u.x remains at same
    // screen X coordinate.  In other words, want to change it from x1 to x2
    // so that:
    //     (u.x - x1) / w1 = (u.x - x2) / w2
    // Simplifying that, we get
    //     (u.x - x1) * (w2 / w1) = u.x - x2
    //     x2 = u.x - (u.x - x1) * (w2 / w1)
    vb.baseVal.x = u.x - (u.x - vb.baseVal.x) * (w2 / w1)
    vb.baseVal.y = u.y - (u.y - vb.baseVal.y) * (h2 / h1)
  }

  function handleWheel(e) {
    if (e.deltaY == 0) return
    // Change scale factor by 1.1 or 1/1.1
    rescale(currentScale * (e.deltaY < 0 ? 1.1 : (1/1.1)),
            toSvg(e.offsetX, e.offsetY))
  }

  function setMode(m) {
    mode = m
    touchid = null
    touchid2 = null
  }

  function panStart(x, y) {
    moved = false
    panLastX = x
    panLastY = y
  }

  function panMove(x, y) {
    let dx = x - panLastX
    let dy = y - panLastY
    if (Math.abs(dx) <= 2 && Math.abs(dy) <= 2) return  // Ignore tiny moves

    moved = true
    panLastX = x
    panLastY = y

    // Firefox workaround: get dimensions from parentNode.
    const swidth = svg.clientWidth || svg.parentNode.clientWidth
    const sheight = svg.clientHeight || svg.parentNode.clientHeight

    // Convert deltas from screen space to svg space.
    dx *= (svg.viewBox.baseVal.width / swidth)
    dy *= (svg.viewBox.baseVal.height / sheight)

    svg.viewBox.baseVal.x -= dx
    svg.viewBox.baseVal.y -= dy
  }

  function handleScanStart(e) {
    if (e.button != 0) return  // Do not catch right-clicks etc.
    setMode(MOUSEPAN)
    panStart(e.clientX, e.clientY)
    e.preventDefault()
    svg.addEventListener("mousemove", handleScanMove)
  }

  function handleScanMove(e) {
    if (e.buttons == 0) {
      // Missed an end event, perhaps because mouse moved outside window.
      setMode(IDLE)
      svg.removeEventListener("mousemove", handleScanMove)
      return
    }
    if (mode == MOUSEPAN) panMove(e.clientX, e.clientY)
  }

  function handleScanEnd(e) {
    if (mode == MOUSEPAN) panMove(e.clientX, e.clientY)
    setMode(IDLE)
    svg.removeEventListener("mousemove", handleScanMove)
    if (!moved) clickHandler(e.target)
  }

  // Find touch object with specified identifier.
  function findTouch(tlist, id) {
    for (const t of tlist) {
      if (t.identifier == id) return t
    }
    return null
  }

 // Return distance between two touch points
  function touchGap(t1, t2) {
    const dx = t1.clientX - t2.clientX
    const dy = t1.clientY - t2.clientY
    return Math.hypot(dx, dy)
  }

  function handleTouchStart(e) {
    if (mode == IDLE && e.changedTouches.length == 1) {
      // Start touch based panning
      const t = e.changedTouches[0]
      setMode(TOUCHPAN)
      touchid = t.identifier
      panStart(t.clientX, t.clientY)
      e.preventDefault()
    } else if (mode == TOUCHPAN && e.touches.length == 2) {
      // Start pinch zooming
      setMode(TOUCHZOOM)
      const t1 = e.touches[0]
      const t2 = e.touches[1]
      touchid = t1.identifier
      touchid2 = t2.identifier
      initScale = currentScale
      initGap = touchGap(t1, t2)
      centerPoint = toSvg((t1.clientX + t2.clientX) / 2,
                          (t1.clientY + t2.clientY) / 2)
      e.preventDefault()
    }
  }

  function handleTouchMove(e) {
    if (mode == TOUCHPAN) {
      const t = findTouch(e.changedTouches, touchid)
      if (t == null) return
      if (e.touches.length != 1) {
        setMode(IDLE)
        return
      }
      panMove(t.clientX, t.clientY)
      e.preventDefault()
    } else if (mode == TOUCHZOOM) {
      // Get two touches; new gap; rescale to ratio.
      const t1 = findTouch(e.touches, touchid)
      const t2 = findTouch(e.touches, touchid2)
      if (t1 == null || t2 == null) return
      const gap = touchGap(t1, t2)
      rescale(initScale * gap / initGap, centerPoint)
      e.preventDefault()
    }
  }

  function handleTouchEnd(e) {
    if (mode == TOUCHPAN) {
      const t = findTouch(e.changedTouches, touchid)
      if (t == null) return
      panMove(t.clientX, t.clientY)
      setMode(IDLE)
      e.preventDefault()
      if (!moved) clickHandler(t.target)
    } else if (mode == TOUCHZOOM) {
      setMode(IDLE)
      e.preventDefault()
    }
  }

  svg.addEventListener("mousedown", handleScanStart)
  svg.addEventListener("mouseup", handleScanEnd)
  svg.addEventListener("touchstart", handleTouchStart)
  svg.addEventListener("touchmove", handleTouchMove)
  svg.addEventListener("touchend", handleTouchEnd)
  svg.addEventListener("wheel", handleWheel, true)
}

function initMenus() {
  'use strict';

  let activeMenu = null;
  let activeMenuHdr = null;

  function cancelActiveMenu() {
    if (activeMenu == null) return;
    activeMenu.style.display = "none";
    activeMenu = null;
    activeMenuHdr = null;
  }

  // Set click handlers on every menu header.
  for (const menu of document.getElementsByClassName("submenu")) {
    const hdr = menu.parentElement;
    if (hdr == null) return;
    if (hdr.classList.contains("disabled")) return;
    function showMenu(e) {
      // menu is a child of hdr, so this event can fire for clicks
      // inside menu. Ignore such clicks.
      if (e.target.parentElement != hdr) return;
      activeMenu = menu;
      activeMenuHdr = hdr;
      menu.style.display = "block";
    }
    hdr.addEventListener("mousedown", showMenu);
    hdr.addEventListener("touchstart", showMenu);
  }

  // If there is an active menu and a down event outside, retract the menu.
  for (const t of ["mousedown", "touchstart"]) {
    document.addEventListener(t, (e) => {
      // Note: to avoid unnecessary flicker, if the down event is inside
      // the active menu header, do not retract the menu.
      if (activeMenuHdr != e.target.closest(".menu-item")) {
        cancelActiveMenu();
      }
    }, { passive: true, capture: true });
  }

  // If there is an active menu and an up event inside, retract the menu.
  document.addEventListener("mouseup", (e) => {
    if (activeMenu == e.target.closest(".submenu")) {
      cancelActiveMenu();
    }
  }, { passive: true, capture: true });
}

function viewer(baseUrl, nodes) {
  'use strict';

  // Elements
  const search = document.getElementById("search")
  const graph0 = document.getElementById("graph0")
  const svg = (graph0 == null ? null : graph0.parentElement)
  const toptable = document.getElementById("toptable")

  let regexpActive = false
  let selected = new Map()
  let origFill = new Map()
  let searchAlarm = null
  let buttonsEnabled = true

  function handleDetails(e) {
    e.preventDefault()
    const detailsText = document.getElementById("detailsbox")
    if (detailsText != null) {
      if (detailsText.style.display === "block") {
        detailsText.style.display = "none"
      } else {
        detailsText.style.display = "block"
      }
    }
  }

  function handleKey(e) {
    if (e.keyCode != 13) return
    window.location.href =
        updateUrl(new URL({{.BaseURL}}, window.location.href), "f")
    e.preventDefault()
  }

  function handleSearch() {
    // Delay expensive processing so a flurry of key strokes is handled once.
    if (searchAlarm != null) {
      clearTimeout(searchAlarm)
    }
    searchAlarm = setTimeout(selectMatching, 300)

    regexpActive = true
    updateButtons()
  }

  function selectMatching() {
    searchAlarm = null
    let re = null
    if (search.value != "") {
      try {
        re = new RegExp(search.value)
      } catch (e) {
        // TODO: Display error state in search box
        return
      }
    }

    function match(text) {
      return re != null && re.test(text)
    }

    // drop currently selected items that do not match re.
    selected.forEach(function(v, n) {
      if (!match(nodes[n])) {
        unselect(n, document.getElementById("node" + n))
      }
    })

    // add matching items that are not currently selected.
    for (let n = 0; n < nodes.length; n++) {
      if (!selected.has(n) && match(nodes[n])) {
        select(n, document.getElementById("node" + n))
      }
    }

    updateButtons()
  }

  function toggleSvgSelect(elem) {
    // Walk up to immediate child of graph0
    while (elem != null && elem.parentElement != graph0) {
      elem = elem.parentElement
    }
    if (!elem) return

    // Disable regexp mode.
    regexpActive = false

    const n = nodeId(elem)
    if (n < 0) return
    if (selected.has(n)) {
      unselect(n, elem)
    } else {
      select(n, elem)
    }
    updateButtons()
  }

  function unselect(n, elem) {
    if (elem == null) return
    selected.delete(n)
    setBackground(elem, false)
  }

  function select(n, elem) {
    if (elem == null) return
    selected.set(n, true)
    setBackground(elem, true)
  }

  function nodeId(elem) {
    const id = elem.id
    if (!id) return -1
    if (!id.startsWith("node")) return -1
    const n = parseInt(id.slice(4), 10)
    if (isNaN(n)) return -1
    if (n < 0 || n >= nodes.length) return -1
    return n
  }

  function setBackground(elem, set) {
    // Handle table row highlighting.
    if (elem.nodeName == "TR") {
      elem.classList.toggle("hilite", set)
      return
    }

    // Handle svg element highlighting.
    const p = findPolygon(elem)
    if (p != null) {
      if (set) {
        origFill.set(p, p.style.fill)
        p.style.fill = "#ccccff"
      } else if (origFill.has(p)) {
        p.style.fill = origFill.get(p)
      }
    }
  }

  function findPolygon(elem) {
    if (elem.localName == "polygon") return elem
    for (const c of elem.children) {
      const p = findPolygon(c)
      if (p != null) return p
    }
    return null
  }

  // convert a string to a regexp that matches that string.
  function quotemeta(str) {
    return str.replace(/([\\\.?+*\[\](){}|^$])/g, '\\$1')
  }

  // Update id's href to reflect current selection whenever it is
  // liable to be followed.
  function makeLinkDynamic(id) {
    const elem = document.getElementById(id)
    if (elem == null) return

    // Most links copy current selection into the "f" parameter,
    // but Refine menu links are different.
    let param = "f"
    if (id == "ignore") param = "i"
    if (id == "hide") param = "h"
    if (id == "show") param = "s"

    // We update on mouseenter so middle-click/right-click work properly.
    elem.addEventListener("mouseenter", updater)
    elem.addEventListener("touchstart", updater)

    function updater() {
      elem.href = updateUrl(new URL(elem.href), param)
    }
  }

  // Update URL to reflect current selection.
  function updateUrl(url, param) {
    url.hash = ""

    // The selection can be in one of two modes: regexp-based or
    // list-based.  Construct regular expression depending on mode.
    let re = regexpActive
        ? search.value
        : Array.from(selected.keys()).map(key => quotemeta(nodes[key])).join("|")

    // Copy params from this page's URL.
    const params = url.searchParams
    for (const p of new URLSearchParams(window.location.search)) {
      params.set(p[0], p[1])
    }

    if (re != "") {
      // For focus/show, forget old parameter.  For others, add to re.
      if (param != "f" && param != "s" && params.has(param)) {
        const old = params.get(param)
         if (old != "") {
          re += "|" + old
        }
      }
      params.set(param, re)
    } else {
      params.delete(param)
    }

    return url.toString()
  }

  function handleTopClick(e) {
    // Walk back until we find TR and then get the Name column (index 5)
    let elem = e.target
    while (elem != null && elem.nodeName != "TR") {
      elem = elem.parentElement
    }
    if (elem == null || elem.children.length < 6) return

    e.preventDefault()
    const tr = elem
    const td = elem.children[5]
    if (td.nodeName != "TD") return
    const name = td.innerText
    const index = nodes.indexOf(name)
    if (index < 0) return

    // Disable regexp mode.
    regexpActive = false

    if (selected.has(index)) {
      unselect(index, elem)
    } else {
      select(index, elem)
    }
    updateButtons()
  }

  function updateButtons() {
    const enable = (search.value != "" || selected.size != 0)
    if (buttonsEnabled == enable) return
    buttonsEnabled = enable
    for (const id of ["focus", "ignore", "hide", "show"]) {
      const link = document.getElementById(id)
      if (link != null) {
        link.classList.toggle("disabled", !enable)
      }
    }
    if (document.getElementById("graph") !== null) {
      document.getElementById("refine").classList.remove("disabled")
    }
  }

  // Initialize button states
  updateButtons()

  // Setup event handlers
  initMenus()
  if (svg != null) {
    initPanAndZoom(svg, toggleSvgSelect)
  }
  if (toptable != null) {
    toptable.addEventListener("mousedown", handleTopClick)
    toptable.addEventListener("touchstart", handleTopClick)
  }

  const ids = ["topbtn", "graphbtn", "peek", "list", "disasm",
               "focus", "ignore", "hide", "show"]
  ids.forEach(makeLinkDynamic)

  // Bind action to button with specified id.
  function addAction(id, action) {
    const btn = document.getElementById(id)
    if (btn != null) {
      btn.addEventListener("click", action)
      btn.addEventListener("touchstart", action)
    }
  }

  addAction("details", handleDetails)

  search.addEventListener("input", handleSearch)
  search.addEventListener("keydown", handleKey)

  // Give initial focus to main container so it can be scrolled using keys.
  const main = document.getElementById("bodycontainer")
  if (main) {
    main.focus()
  }
}
</script>
{{end}}

{{define "top" -}}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>{{.Title}}</title>
{{template "css" .}}
<style type="text/css">
</style>
</head>
<body>
{{template "header" .}}
<div id="top">
<table id="toptable">
<thead>
<tr>
<th id="flathdr1">Flat</th>
<th id="flathdr2">Flat%</th>
<th>Sum%</th>
<th id="cumhdr1">Cum</th>
<th id="cumhdr2">Cum%</th>
<th id="namehdr">Name</th>
<th>Inlined?</th>
</tr>
</thead>
<tbody id="rows"></tbody>
</table>
</div>

{{template "script" .}}
<script>
function makeTopTable(total, entries) {
  const rows = document.getElementById("rows")
  if (rows == null) return

  // Store initial index in each entry so we have stable node ids for selection.
  for (let i = 0; i < entries.length; i++) {
    entries[i].Id = "node" + i
  }

  // Which column are we currently sorted by and in what order?
  let currentColumn = ""
  let descending = false
  sortBy("Flat")

  function sortBy(column) {
    // Update sort criteria
    if (column == currentColumn) {
      descending = !descending  // Reverse order
    } else {
      currentColumn = column
      descending = (column != "Name")
    }

    // Sort according to current criteria.
    function cmp(a, b) {
      const av = a[currentColumn]
      const bv = b[currentColumn]
      if (av < bv) return -1
      if (av > bv) return +1
      return 0
    }
    entries.sort(cmp)
    if (descending) entries.reverse()

    function addCell(tr, val) {
      const td = document.createElement('td')
      td.textContent = val
      tr.appendChild(td)
    }

    function percent(v) {
      return (v * 100.0 / total).toFixed(2) + "%"
    }

    // Generate rows
    const fragment = document.createDocumentFragment()
    let sum = 0
    for (const row of entries) {
      const tr = document.createElement('tr')
      tr.id = row.Id
      sum += row.Flat
      addCell(tr, row.FlatFormat)
      addCell(tr, percent(row.Flat))
      addCell(tr, percent(sum))
      addCell(tr, row.CumFormat)
      addCell(tr, percent(row.Cum))
      addCell(tr, row.Name)
      addCell(tr, row.InlineLabel)
      fragment.appendChild(tr)
    }

    rows.textContent = ''  // Remove old rows
    rows.appendChild(fragment)
  }

  // Make different column headers trigger sorting.
  function bindSort(id, column) {
    const hdr = document.getElementById(id)
    if (hdr == null) return
    const fn = function() { sortBy(column) }
    hdr.addEventListener("click", fn)
    hdr.addEventListener("touch", fn)
  }
  bindSort("flathdr1", "Flat")
  bindSort("flathdr2", "Flat")
  bindSort("cumhdr1", "Cum")
  bindSort("cumhdr2", "Cum")
  bindSort("namehdr", "Name")
}

viewer({{.BaseURL}}, {{.Nodes}})
makeTopTable({{.Total}}, {{.Top}})
</script>

</body>
</html>
{{end}}

{{define "sourcelisting" -}}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>{{.Title}}</title>
{{template "css" .}}
{{template "weblistcss" .}}
{{template "weblistjs" .}}
</head>
<body>
{{template "header" .}}
<div id="content" class="source">
{{.HTMLBody}}
</div>
{{template "script" .}}
<script>viewer({{.BaseURL}}, null)</script>
</body>
</html>
{{end}}

{{define "plaintext" -}}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>{{.Title}}</title>
{{template "css" .}}
</head>
<body>
{{template "header" .}}
<div id="content">
<pre>
{{.TextBody}}
</pre>
</div>
{{template "script" .}}
<script>viewer({{.BaseURL}}, null)</script>
</body>
</html>
{{end}}
`))
}