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backend/node_modules/chevrotain/diagrams/vendor/railroad-diagrams.js

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+/*
+ Railroad Diagrams
+ by Tab Atkins Jr. (and others)
+ http://xanthir.com
+ http://twitter.com/tabatkins
+ http://github.com/tabatkins/railroad-diagrams
+
+ This document and all associated files in the github project are licensed under CC0: http://creativecommons.org/publicdomain/zero/1.0/
+ This means you can reuse, remix, or otherwise appropriate this project for your own use WITHOUT RESTRICTION.
+ (The actual legal meaning can be found at the above link.)
+ Don't ask me for permission to use any part of this project, JUST USE IT.
+ I would appreciate attribution, but that is not required by the license.
+ */
+
+/*
+ This file uses a module pattern to avoid leaking names into the global scope.
+ The only accidental leakage is the name "temp".
+ The exported names can be found at the bottom of this file;
+ simply change the names in the array of strings to change what they are called in your application.
+
+ As well, several configuration constants are passed into the module function at the bottom of this file.
+ At runtime, these constants can be found on the Diagram class.
+ */
+
+;(function (options) {
+  function subclassOf(baseClass, superClass) {
+    baseClass.prototype = Object.create(superClass.prototype)
+    baseClass.prototype.$super = superClass.prototype
+  }
+
+  function unnull(/* children */) {
+    return [].slice.call(arguments).reduce(function (sofar, x) {
+      return sofar !== undefined ? sofar : x
+    })
+  }
+
+  function determineGaps(outer, inner) {
+    var diff = outer - inner
+    switch (Diagram.INTERNAL_ALIGNMENT) {
+      case "left":
+        return [0, diff]
+        break
+      case "right":
+        return [diff, 0]
+        break
+      case "center":
+      default:
+        return [diff / 2, diff / 2]
+        break
+    }
+  }
+
+  function wrapString(value) {
+    return typeof value == "string" ? new Terminal(value) : value
+  }
+
+  function stackAtIllegalPosition(items) {
+    /* The height of the last line of the Stack is determined by the last child and
+         therefore any element outside the Stack could overlap with other elements.
+         If the Stack is the last element no overlap can occur. */
+    for (var i = 0; i < items.length; i++) {
+      if (items[i] instanceof Stack && i !== items.length - 1) {
+        return true
+      }
+    }
+    return false
+  }
+
+  function SVG(name, attrs, text) {
+    attrs = attrs || {}
+    text = text || ""
+    var el = document.createElementNS("http://www.w3.org/2000/svg", name)
+    for (var attr in attrs) {
+      if (attr === "xlink:href")
+        el.setAttributeNS("http://www.w3.org/1999/xlink", "href", attrs[attr])
+      else el.setAttribute(attr, attrs[attr])
+    }
+    el.textContent = text
+    return el
+  }
+
+  function FakeSVG(tagName, attrs, text) {
+    if (!(this instanceof FakeSVG)) return new FakeSVG(tagName, attrs, text)
+    if (text) this.children = text
+    else this.children = []
+    this.tagName = tagName
+    this.attrs = unnull(attrs, {})
+    return this
+  }
+  FakeSVG.prototype.format = function (x, y, width) {
+    // Virtual
+  }
+  FakeSVG.prototype.addTo = function (parent) {
+    if (parent instanceof FakeSVG) {
+      parent.children.push(this)
+      return this
+    } else {
+      var svg = this.toSVG()
+      parent.appendChild(svg)
+      return svg
+    }
+  }
+  FakeSVG.prototype.escapeString = function (string) {
+    // Escape markdown and HTML special characters
+    return string.replace(/[*_\`\[\]<&]/g, function (charString) {
+      return "&#" + charString.charCodeAt(0) + ";"
+    })
+  }
+  FakeSVG.prototype.toSVG = function () {
+    var el = SVG(this.tagName, this.attrs)
+    if (typeof this.children == "string") {
+      el.textContent = this.children
+    } else {
+      this.children.forEach(function (e) {
+        el.appendChild(e.toSVG())
+      })
+    }
+    return el
+  }
+  FakeSVG.prototype.toString = function () {
+    var str = "<" + this.tagName
+    var group = this.tagName == "g" || this.tagName == "svg"
+    for (var attr in this.attrs) {
+      str +=
+        " " +
+        attr +
+        '="' +
+        (this.attrs[attr] + "").replace(/&/g, "&amp;").replace(/"/g, "&quot;") +
+        '"'
+    }
+    str += ">"
+    if (group) str += "\n"
+    if (typeof this.children == "string") {
+      str += FakeSVG.prototype.escapeString(this.children)
+    } else {
+      this.children.forEach(function (e) {
+        str += e
+      })
+    }
+    str += "</" + this.tagName + ">\n"
+    return str
+  }
+
+  function Path(x, y) {
+    if (!(this instanceof Path)) return new Path(x, y)
+    FakeSVG.call(this, "path")
+    this.attrs.d = "M" + x + " " + y
+  }
+  subclassOf(Path, FakeSVG)
+  Path.prototype.m = function (x, y) {
+    this.attrs.d += "m" + x + " " + y
+    return this
+  }
+  Path.prototype.h = function (val) {
+    this.attrs.d += "h" + val
+    return this
+  }
+  Path.prototype.right = Path.prototype.h
+  Path.prototype.left = function (val) {
+    return this.h(-val)
+  }
+  Path.prototype.v = function (val) {
+    this.attrs.d += "v" + val
+    return this
+  }
+  Path.prototype.down = Path.prototype.v
+  Path.prototype.up = function (val) {
+    return this.v(-val)
+  }
+  Path.prototype.arc = function (sweep) {
+    var x = Diagram.ARC_RADIUS
+    var y = Diagram.ARC_RADIUS
+    if (sweep[0] == "e" || sweep[1] == "w") {
+      x *= -1
+    }
+    if (sweep[0] == "s" || sweep[1] == "n") {
+      y *= -1
+    }
+    if (sweep == "ne" || sweep == "es" || sweep == "sw" || sweep == "wn") {
+      var cw = 1
+    } else {
+      var cw = 0
+    }
+    this.attrs.d +=
+      "a" +
+      Diagram.ARC_RADIUS +
+      " " +
+      Diagram.ARC_RADIUS +
+      " 0 0 " +
+      cw +
+      " " +
+      x +
+      " " +
+      y
+    return this
+  }
+  Path.prototype.format = function () {
+    // All paths in this library start/end horizontally.
+    // The extra .5 ensures a minor overlap, so there's no seams in bad rasterizers.
+    this.attrs.d += "h.5"
+    return this
+  }
+
+  function Diagram(items) {
+    if (!(this instanceof Diagram)) return new Diagram([].slice.call(arguments))
+    FakeSVG.call(this, "svg", { class: Diagram.DIAGRAM_CLASS })
+    if (stackAtIllegalPosition(items)) {
+      throw new RangeError(
+        "Stack() must only occur at the very last position of Diagram()."
+      )
+    }
+    this.items = items.map(wrapString)
+    this.items.unshift(new Start())
+    this.items.push(new End())
+    this.width =
+      this.items.reduce(function (sofar, el) {
+        return sofar + el.width + (el.needsSpace ? 20 : 0)
+      }, 0) + 1
+    this.height = this.items.reduce(function (sofar, el) {
+      return sofar + el.height
+    }, 0)
+    this.up = Math.max.apply(
+      null,
+      this.items.map(function (x) {
+        return x.up
+      })
+    )
+    this.down = Math.max.apply(
+      null,
+      this.items.map(function (x) {
+        return x.down
+      })
+    )
+    this.formatted = false
+  }
+  subclassOf(Diagram, FakeSVG)
+  for (var option in options) {
+    Diagram[option] = options[option]
+  }
+  Diagram.prototype.format = function (paddingt, paddingr, paddingb, paddingl) {
+    paddingt = unnull(paddingt, 20)
+    paddingr = unnull(paddingr, paddingt, 20)
+    paddingb = unnull(paddingb, paddingt, 20)
+    paddingl = unnull(paddingl, paddingr, 20)
+    var x = paddingl
+    var y = paddingt
+    y += this.up
+    var g = FakeSVG(
+      "g",
+      Diagram.STROKE_ODD_PIXEL_LENGTH ? { transform: "translate(.5 .5)" } : {}
+    )
+    for (var i = 0; i < this.items.length; i++) {
+      var item = this.items[i]
+      if (item.needsSpace) {
+        Path(x, y).h(10).addTo(g)
+        x += 10
+      }
+      item.format(x, y, item.width + item.offsetX).addTo(g)
+      x += item.width + item.offsetX
+      y += item.height
+      if (item.needsSpace) {
+        Path(x, y).h(10).addTo(g)
+        x += 10
+      }
+    }
+    this.attrs.width = this.width + paddingl + paddingr
+    this.attrs.height = this.up + this.height + this.down + paddingt + paddingb
+    this.attrs.viewBox = "0 0 " + this.attrs.width + " " + this.attrs.height
+    g.addTo(this)
+    this.formatted = true
+    return this
+  }
+  Diagram.prototype.addTo = function (parent) {
+    var scriptTag = document.getElementsByTagName("script")
+    scriptTag = scriptTag[scriptTag.length - 1]
+    var parentTag = scriptTag.parentNode
+    parent = parent || parentTag
+    return this.$super.addTo.call(this, parent)
+  }
+  Diagram.prototype.toSVG = function () {
+    if (!this.formatted) {
+      this.format()
+    }
+    return this.$super.toSVG.call(this)
+  }
+  Diagram.prototype.toString = function () {
+    if (!this.formatted) {
+      this.format()
+    }
+    return this.$super.toString.call(this)
+  }
+
+  function ComplexDiagram() {
+    var diagram = new Diagram([].slice.call(arguments))
+    var items = diagram.items
+    items.shift()
+    items.pop()
+    items.unshift(new Start(false))
+    items.push(new End(false))
+    diagram.items = items
+    return diagram
+  }
+
+  function Sequence(items) {
+    if (!(this instanceof Sequence))
+      return new Sequence([].slice.call(arguments))
+    FakeSVG.call(this, "g")
+    if (stackAtIllegalPosition(items)) {
+      throw new RangeError(
+        "Stack() must only occur at the very last position of Sequence()."
+      )
+    }
+    this.items = items.map(wrapString)
+    this.width = this.items.reduce(function (sofar, el) {
+      return sofar + el.width + (el.needsSpace ? 20 : 0)
+    }, 0)
+    this.offsetX = 0
+    this.height = this.items.reduce(function (sofar, el) {
+      return sofar + el.height
+    }, 0)
+    this.up = this.items.reduce(function (sofar, el) {
+      return Math.max(sofar, el.up)
+    }, 0)
+    this.down = this.items.reduce(function (sofar, el) {
+      return Math.max(sofar, el.down)
+    }, 0)
+  }
+  subclassOf(Sequence, FakeSVG)
+  Sequence.prototype.format = function (x, y, width) {
+    // Hook up the two sides if this is narrower than its stated width.
+    var gaps = determineGaps(width, this.width)
+    Path(x, y).h(gaps[0]).addTo(this)
+    Path(x + gaps[0] + this.width, y + this.height)
+      .h(gaps[1])
+      .addTo(this)
+    x += gaps[0]
+
+    for (var i = 0; i < this.items.length; i++) {
+      var item = this.items[i]
+      if (item.needsSpace) {
+        Path(x, y).h(10).addTo(this)
+        x += 10
+      }
+      item.format(x, y, item.width).addTo(this)
+      x += item.width
+      y += item.height
+      if (item.needsSpace) {
+        Path(x, y).h(10).addTo(this)
+        x += 10
+      }
+    }
+    return this
+  }
+
+  function Stack(items) {
+    if (!(this instanceof Stack)) return new Stack([].slice.call(arguments))
+    FakeSVG.call(this, "g")
+    if (stackAtIllegalPosition(items)) {
+      throw new RangeError(
+        "Stack() must only occur at the very last position of Stack()."
+      )
+    }
+    if (items.length === 0) {
+      throw new RangeError("Stack() must have at least one child.")
+    }
+    this.items = items.map(wrapString)
+    this.width = this.items.reduce(function (sofar, el) {
+      return Math.max(sofar, el.width + (el.needsSpace ? 20 : 0))
+    }, 0)
+    if (this.items.length > 1) {
+      this.width += Diagram.ARC_RADIUS * 2
+    }
+
+    this.up = this.items[0].up
+    this.down = this.items[this.items.length - 1].down
+
+    this.height = 0
+    for (var i = 0; i < this.items.length; i++) {
+      this.height += this.items[i].height
+      if (i !== this.items.length - 1) {
+        this.height +=
+          Math.max(this.items[i].down, Diagram.VERTICAL_SEPARATION) +
+          Math.max(this.items[i + 1].up, Diagram.VERTICAL_SEPARATION) +
+          Diagram.ARC_RADIUS * 4
+      }
+    }
+
+    if (this.items.length === 0) {
+      this.offsetX = 0
+    } else {
+      // the value is usually negative because the linebreak resets the x value for the next element
+      this.offsetX = -(
+        this.width -
+        this.items[this.items.length - 1].width -
+        this.items[this.items.length - 1].offsetX -
+        (this.items[this.items.length - 1].needsSpace ? 20 : 0)
+      )
+      if (this.items.length > 1) {
+        this.offsetX += Diagram.ARC_RADIUS * 2
+      }
+    }
+  }
+  subclassOf(Stack, FakeSVG)
+  Stack.prototype.format = function (x, y, width) {
+    var xIntitial = x
+
+    for (var i = 0; i < this.items.length; i++) {
+      var item = this.items[i]
+      if (item.needsSpace) {
+        Path(x, y).h(10).addTo(this)
+        x += 10
+      }
+      item
+        .format(
+          x,
+          y,
+          Math.max(item.width + item.offsetX, Diagram.ARC_RADIUS * 2)
+        )
+        .addTo(this)
+      x += Math.max(item.width + item.offsetX, Diagram.ARC_RADIUS * 2)
+      y += item.height
+      if (item.needsSpace) {
+        Path(x, y).h(10).addTo(this)
+        x += 10
+      }
+
+      if (i !== this.items.length - 1) {
+        Path(x, y)
+          .arc("ne")
+          .down(Math.max(item.down, Diagram.VERTICAL_SEPARATION))
+          .arc("es")
+          .left(x - xIntitial - Diagram.ARC_RADIUS * 2)
+          .arc("nw")
+          .down(Math.max(this.items[i + 1].up, Diagram.VERTICAL_SEPARATION))
+          .arc("ws")
+          .addTo(this)
+
+        y +=
+          Math.max(item.down, Diagram.VERTICAL_SEPARATION) +
+          Math.max(this.items[i + 1].up, Diagram.VERTICAL_SEPARATION) +
+          Diagram.ARC_RADIUS * 4
+        x = xIntitial + Diagram.ARC_RADIUS * 2
+      }
+    }
+
+    Path(x, y)
+      .h(width - (this.width + this.offsetX))
+      .addTo(this)
+
+    return this
+  }
+
+  function Choice(normal, items) {
+    if (!(this instanceof Choice))
+      return new Choice(normal, [].slice.call(arguments, 1))
+    FakeSVG.call(this, "g")
+    if (typeof normal !== "number" || normal !== Math.floor(normal)) {
+      throw new TypeError("The first argument of Choice() must be an integer.")
+    } else if (normal < 0 || normal >= items.length) {
+      throw new RangeError(
+        "The first argument of Choice() must be an index for one of the items."
+      )
+    } else {
+      this.normal = normal
+    }
+    this.items = items.map(wrapString)
+    this.width =
+      this.items.reduce(function (sofar, el) {
+        return Math.max(sofar, el.width)
+      }, 0) +
+      Diagram.ARC_RADIUS * 4
+    this.offsetX = 0
+    this.height = this.items[normal].height
+    this.up = this.down = 0
+    for (var i = 0; i < this.items.length; i++) {
+      var item = this.items[i]
+      if (i < normal) {
+        this.up += Math.max(
+          Diagram.ARC_RADIUS,
+          item.up + item.height + item.down + Diagram.VERTICAL_SEPARATION
+        )
+      }
+      if (i == normal) {
+        this.up += Math.max(Diagram.ARC_RADIUS, item.up)
+        this.down += Math.max(Diagram.ARC_RADIUS, item.down)
+      }
+      if (i > normal) {
+        this.down += Math.max(
+          Diagram.ARC_RADIUS,
+          Diagram.VERTICAL_SEPARATION + item.up + item.down + item.height
+        )
+      }
+    }
+  }
+  subclassOf(Choice, FakeSVG)
+  Choice.prototype.format = function (x, y, width) {
+    // Hook up the two sides if this is narrower than its stated width.
+    var gaps = determineGaps(width, this.width)
+    Path(x, y).h(gaps[0]).addTo(this)
+    Path(x + gaps[0] + this.width, y + this.height)
+      .h(gaps[1])
+      .addTo(this)
+    x += gaps[0]
+
+    var last = this.items.length - 1
+    var innerWidth = this.width - Diagram.ARC_RADIUS * 4
+
+    // Do the elements that curve above
+    for (var i = this.normal - 1; i >= 0; i--) {
+      var item = this.items[i]
+      if (i == this.normal - 1) {
+        var distanceFromY = Math.max(
+          Diagram.ARC_RADIUS * 2,
+          this.items[i + 1].up +
+            Diagram.VERTICAL_SEPARATION +
+            item.height +
+            item.down
+        )
+      }
+      Path(x, y)
+        .arc("se")
+        .up(distanceFromY - Diagram.ARC_RADIUS * 2)
+        .arc("wn")
+        .addTo(this)
+      item
+        .format(x + Diagram.ARC_RADIUS * 2, y - distanceFromY, innerWidth)
+        .addTo(this)
+      Path(
+        x + Diagram.ARC_RADIUS * 2 + innerWidth,
+        y - distanceFromY + item.height
+      )
+        .arc("ne")
+        .down(
+          distanceFromY -
+            item.height +
+            this.items[this.normal].height -
+            Diagram.ARC_RADIUS * 2
+        )
+        .arc("ws")
+        .addTo(this)
+      distanceFromY += Math.max(
+        Diagram.ARC_RADIUS,
+        item.up +
+          Diagram.VERTICAL_SEPARATION +
+          (i == 0 ? 0 : this.items[i - 1].down + this.items[i - 1].height)
+      )
+    }
+
+    // Do the straight-line path.
+    Path(x, y)
+      .right(Diagram.ARC_RADIUS * 2)
+      .addTo(this)
+    this.items[this.normal]
+      .format(x + Diagram.ARC_RADIUS * 2, y, innerWidth)
+      .addTo(this)
+    Path(x + Diagram.ARC_RADIUS * 2 + innerWidth, y + this.height)
+      .right(Diagram.ARC_RADIUS * 2)
+      .addTo(this)
+
+    // Do the elements that curve below
+    for (var i = this.normal + 1; i <= last; i++) {
+      var item = this.items[i]
+      if (i == this.normal + 1) {
+        var distanceFromY = Math.max(
+          Diagram.ARC_RADIUS * 2,
+          this.items[i - 1].height +
+            this.items[i - 1].down +
+            Diagram.VERTICAL_SEPARATION +
+            item.up
+        )
+      }
+      Path(x, y)
+        .arc("ne")
+        .down(distanceFromY - Diagram.ARC_RADIUS * 2)
+        .arc("ws")
+        .addTo(this)
+      item
+        .format(x + Diagram.ARC_RADIUS * 2, y + distanceFromY, innerWidth)
+        .addTo(this)
+      Path(
+        x + Diagram.ARC_RADIUS * 2 + innerWidth,
+        y + distanceFromY + item.height
+      )
+        .arc("se")
+        .up(
+          distanceFromY -
+            Diagram.ARC_RADIUS * 2 +
+            item.height -
+            this.items[this.normal].height
+        )
+        .arc("wn")
+        .addTo(this)
+      distanceFromY += Math.max(
+        Diagram.ARC_RADIUS,
+        item.height +
+          item.down +
+          Diagram.VERTICAL_SEPARATION +
+          (i == last ? 0 : this.items[i + 1].up)
+      )
+    }
+
+    return this
+  }
+
+  function Optional(item, skip) {
+    if (skip === undefined) return Choice(1, Skip(), item)
+    else if (skip === "skip") return Choice(0, Skip(), item)
+    else throw "Unknown value for Optional()'s 'skip' argument."
+  }
+
+  function OneOrMore(item, rep) {
+    if (!(this instanceof OneOrMore)) return new OneOrMore(item, rep)
+    FakeSVG.call(this, "g")
+    rep = rep || new Skip()
+    this.item = wrapString(item)
+    this.rep = wrapString(rep)
+    this.width =
+      Math.max(this.item.width, this.rep.width) + Diagram.ARC_RADIUS * 2
+    this.offsetX = 0
+    this.height = this.item.height
+    this.up = this.item.up
+    this.down = Math.max(
+      Diagram.ARC_RADIUS * 2,
+      this.item.down +
+        Diagram.VERTICAL_SEPARATION +
+        this.rep.up +
+        this.rep.height +
+        this.rep.down
+    )
+  }
+  subclassOf(OneOrMore, FakeSVG)
+  OneOrMore.prototype.needsSpace = true
+  OneOrMore.prototype.format = function (x, y, width) {
+    // Hook up the two sides if this is narrower than its stated width.
+    var gaps = determineGaps(width, this.width)
+    Path(x, y).h(gaps[0]).addTo(this)
+    Path(x + gaps[0] + this.width, y + this.height)
+      .h(gaps[1])
+      .addTo(this)
+    x += gaps[0]
+
+    // Draw item
+    Path(x, y).right(Diagram.ARC_RADIUS).addTo(this)
+    this.item
+      .format(x + Diagram.ARC_RADIUS, y, this.width - Diagram.ARC_RADIUS * 2)
+      .addTo(this)
+    Path(x + this.width - Diagram.ARC_RADIUS, y + this.height)
+      .right(Diagram.ARC_RADIUS)
+      .addTo(this)
+
+    // Draw repeat arc
+    var distanceFromY = Math.max(
+      Diagram.ARC_RADIUS * 2,
+      this.item.height +
+        this.item.down +
+        Diagram.VERTICAL_SEPARATION +
+        this.rep.up
+    )
+    Path(x + Diagram.ARC_RADIUS, y)
+      .arc("nw")
+      .down(distanceFromY - Diagram.ARC_RADIUS * 2)
+      .arc("ws")
+      .addTo(this)
+    this.rep
+      .format(
+        x + Diagram.ARC_RADIUS,
+        y + distanceFromY,
+        this.width - Diagram.ARC_RADIUS * 2
+      )
+      .addTo(this)
+    Path(
+      x + this.width - Diagram.ARC_RADIUS,
+      y + distanceFromY + this.rep.height
+    )
+      .arc("se")
+      .up(
+        distanceFromY -
+          Diagram.ARC_RADIUS * 2 +
+          this.rep.height -
+          this.item.height
+      )
+      .arc("en")
+      .addTo(this)
+
+    return this
+  }
+
+  function ZeroOrMore(item, rep, skip) {
+    return Optional(OneOrMore(item, rep), skip)
+  }
+
+  function Start(simpleType) {
+    if (!(this instanceof Start)) return new Start()
+    FakeSVG.call(this, "path")
+    this.width = 20
+    this.height = 0
+    this.offsetX = 0
+    this.up = 10
+    this.down = 10
+    this.simpleType = simpleType
+  }
+  subclassOf(Start, FakeSVG)
+  Start.prototype.format = function (x, y) {
+    if (this.simpleType === false) {
+      this.attrs.d = "M " + x + " " + (y - 10) + " v 20 m 0 -10 h 20.5"
+    } else {
+      this.attrs.d =
+        "M " + x + " " + (y - 10) + " v 20 m 10 -20 v 20 m -10 -10 h 20.5"
+    }
+    return this
+  }
+
+  function End(simpleType) {
+    if (!(this instanceof End)) return new End()
+    FakeSVG.call(this, "path")
+    this.width = 20
+    this.height = 0
+    this.offsetX = 0
+    this.up = 10
+    this.down = 10
+    this.simpleType = simpleType
+  }
+  subclassOf(End, FakeSVG)
+  End.prototype.format = function (x, y) {
+    if (this.simpleType === false) {
+      this.attrs.d = "M " + x + " " + y + " h 20 m 0 -10 v 20"
+    } else {
+      this.attrs.d = "M " + x + " " + y + " h 20 m -10 -10 v 20 m 10 -20 v 20"
+    }
+    return this
+  }
+
+  function Terminal(
+    text,
+    href,
+    title,
+    occurrenceIdx,
+    topRuleName,
+    dslRuleName,
+    tokenName
+  ) {
+    if (!(this instanceof Terminal))
+      return new Terminal(
+        text,
+        href,
+        title,
+        occurrenceIdx,
+        topRuleName,
+        dslRuleName,
+        tokenName
+      )
+    FakeSVG.call(this, "g", { class: "terminal" })
+    this.text = text
+    this.label = text
+    this.href = href
+    this.title = title
+    this.occurrenceIdx = occurrenceIdx
+    this.topRuleName = topRuleName
+    this.dslRuleName = dslRuleName
+    this.tokenName = tokenName
+    this.width =
+      text.length * 8 +
+      20 /* Assume that each char is .5em, and that the em is 16px */
+    this.height = 0
+    this.offsetX = 0
+    this.up = 11
+    this.down = 11
+  }
+  subclassOf(Terminal, FakeSVG)
+  Terminal.prototype.needsSpace = true
+  Terminal.prototype.format = function (x, y, width) {
+    // Hook up the two sides if this is narrower than its stated width.
+    var gaps = determineGaps(width, this.width)
+    Path(x, y).h(gaps[0]).addTo(this)
+    Path(x + gaps[0] + this.width, y)
+      .h(gaps[1])
+      .addTo(this)
+    x += gaps[0]
+
+    FakeSVG("rect", {
+      x: x,
+      y: y - 11,
+      width: this.width,
+      height: this.up + this.down,
+      rx: 10,
+      ry: 10
+    }).addTo(this)
+
+    var text = FakeSVG(
+      "text",
+      {
+        x: x + this.width / 2,
+        y: y + 4,
+        occurrenceIdx: this.occurrenceIdx,
+        topRuleName: this.topRuleName,
+        dslRuleName: this.dslRuleName,
+        tokenName: this.tokenName,
+        label: this.label
+      },
+      this.text
+    )
+    var title = FakeSVG("title", {}, this.title)
+    if (this.href) FakeSVG("a", { "xlink:href": this.href }, [text]).addTo(this)
+    else {
+      text.addTo(this)
+      if (this.title !== undefined) {
+        title.addTo(this)
+      }
+    }
+    return this
+  }
+
+  function NonTerminal(text, href, occurrenceIdx, topRuleName) {
+    if (!(this instanceof NonTerminal))
+      return new NonTerminal(text, href, occurrenceIdx, topRuleName)
+    FakeSVG.call(this, "g", { class: "non-terminal" })
+    this.text = text
+    this.ruleName = text
+    this.href = href
+    this.occurrenceIdx = occurrenceIdx
+    this.topRuleName = topRuleName
+    this.width = text.length * 8 + 20
+    this.height = 0
+    this.offsetX = 0
+    this.up = 11
+    this.down = 11
+  }
+  subclassOf(NonTerminal, FakeSVG)
+  NonTerminal.prototype.needsSpace = true
+  NonTerminal.prototype.format = function (x, y, width) {
+    // Hook up the two sides if this is narrower than its stated width.
+    var gaps = determineGaps(width, this.width)
+    Path(x, y).h(gaps[0]).addTo(this)
+    Path(x + gaps[0] + this.width, y)
+      .h(gaps[1])
+      .addTo(this)
+    x += gaps[0]
+
+    FakeSVG("rect", {
+      x: x,
+      y: y - 11,
+      width: this.width,
+      height: this.up + this.down
+    }).addTo(this)
+    var text = FakeSVG(
+      "text",
+      {
+        x: x + this.width / 2,
+        y: y + 4,
+        occurrenceIdx: this.occurrenceIdx,
+        topRuleName: this.topRuleName,
+        ruleName: this.ruleName
+      },
+      this.text
+    )
+    if (this.href) FakeSVG("a", { "xlink:href": this.href }, [text]).addTo(this)
+    else text.addTo(this)
+    return this
+  }
+
+  function Comment(text) {
+    if (!(this instanceof Comment)) return new Comment(text)
+    FakeSVG.call(this, "g")
+    this.text = text
+    this.width = text.length * 7 + 10
+    this.height = 0
+    this.offsetX = 0
+    this.up = 11
+    this.down = 11
+  }
+  subclassOf(Comment, FakeSVG)
+  Comment.prototype.needsSpace = true
+  Comment.prototype.format = function (x, y, width) {
+    // Hook up the two sides if this is narrower than its stated width.
+    var gaps = determineGaps(width, this.width)
+    Path(x, y).h(gaps[0]).addTo(this)
+    Path(x + gaps[0] + this.width, y + this.height)
+      .h(gaps[1])
+      .addTo(this)
+    x += gaps[0]
+
+    FakeSVG(
+      "text",
+      {
+        x: x + this.width / 2,
+        y: y + 5,
+        class: "comment"
+      },
+      this.text
+    ).addTo(this)
+    return this
+  }
+
+  function Skip() {
+    if (!(this instanceof Skip)) return new Skip()
+    FakeSVG.call(this, "g")
+    this.width = 0
+    this.height = 0
+    this.offsetX = 0
+    this.up = 0
+    this.down = 0
+  }
+  subclassOf(Skip, FakeSVG)
+  Skip.prototype.format = function (x, y, width) {
+    Path(x, y).right(width).addTo(this)
+    return this
+  }
+
+  var root
+  if (typeof define === "function" && define.amd) {
+    // AMD. Register as an anonymous module.
+    root = {}
+    define([], function () {
+      return root
+    })
+  } else if (typeof exports === "object") {
+    // CommonJS for node
+    root = exports
+  } else {
+    // Browser globals (root is window.railroad)
+    this.railroad = {}
+    root = this.railroad
+  }
+
+  var temp = [
+    Diagram,
+    ComplexDiagram,
+    Sequence,
+    Stack,
+    Choice,
+    Optional,
+    OneOrMore,
+    ZeroOrMore,
+    Terminal,
+    NonTerminal,
+    Comment,
+    Skip
+  ]
+  /*
+     These are the names that the internal classes are exported as.
+     If you would like different names, adjust them here.
+     */
+  ;[
+    "Diagram",
+    "ComplexDiagram",
+    "Sequence",
+    "Stack",
+    "Choice",
+    "Optional",
+    "OneOrMore",
+    "ZeroOrMore",
+    "Terminal",
+    "NonTerminal",
+    "Comment",
+    "Skip"
+  ].forEach(function (e, i) {
+    root[e] = temp[i]
+  })
+}.call(this, {
+  VERTICAL_SEPARATION: 8,
+  ARC_RADIUS: 10,
+  DIAGRAM_CLASS: "railroad-diagram",
+  STROKE_ODD_PIXEL_LENGTH: true,
+  INTERNAL_ALIGNMENT: "center"
+}))