diff --git a/src/config.typ b/src/config.typ
new file mode 100644
index 0000000..5d7c1ff
--- /dev/null
+++ b/src/config.typ
@@ -0,0 +1,78 @@
+#let config(
+  default-font-family: "Ubuntu Mono",
+  default-font-size: 1em,
+  italic-font-family: "Ubuntu Mono",
+  italic-font-size: 0.8em,
+  background: white,
+  text-color: black,
+  link-color: black,
+  bit-i-color: black,
+  border-color: black,
+  bit-width: 30,
+  bit-height: 30,
+  description-margin: 10,
+  dash-length: 6,
+  dash-space: 4,
+  arrow-size: 10,
+  margins: (20, 20, 20, 20),
+  arrow-margin: 4,
+  values-gap: 5,
+  arrow-label-distance: 5,
+  force-descs-on-side: false,
+  left-labels: false,
+  width: 1200,
+  height: 800,
+  full-page: false
+) = {
+  return (
+    default-font-family: default-font-family,
+    default-font-size: default-font-size,
+    italic-font-family: italic-font-family,
+    italic-font-size: italic-font-size,
+    background: background,
+    text-color: text-color,
+    link-color: link-color,
+    bit-i-color: bit-i-color,
+    border-color: border-color,
+    bit-width: bit-width,
+    bit-height: bit-height,
+    description-margin: description-margin,
+    dash-length: dash-length,
+    dash-space: dash-space,
+    arrow-size: arrow-size,
+    margins: margins,
+    arrow-margin: arrow-margin,
+    values-gap: values-gap,
+    arrow-label-distance: arrow-label-distance,
+    force-descs-on-side: force-descs-on-side,
+    left-labels: left-labels,
+    width: width,
+    height: height,
+    full-page: full-page
+  )
+}
+
+#let dark = config.with(
+  background: rgb(24, 24, 24),
+  text-color: rgb(216, 216, 216),
+  link-color: rgb(150, 150, 150),
+  bit-i-color: rgb(180, 180, 180),
+  border-color: rgb(180, 180, 180)
+)
+
+#let blueprint = config.with(
+  background: rgb(53, 77, 158),
+  text-color: rgb(231, 236, 249),
+  link-color: rgb(169, 193, 228),
+  bit-i-color: rgb(214, 223, 244),
+  border-color: rgb(214, 223, 244)
+)
+
+#let transparent = config.with(
+  background: rgb(0, 0, 0, 0),
+  text-color: rgb(128, 128, 128),
+  link-color: rgb(128, 128, 128),
+  bit-i-color: rgb(128, 128, 128),
+  border-color: rgb(128, 128, 128)
+)
+
diff --git a/src/lib.typ b/src/lib.typ
new file mode 100644
index 0000000..fa6c0a3
--- /dev/null
+++ b/src/lib.typ
@@ -0,0 +1,4 @@
+#let version = version((0,0,1))
+
+#import "config.typ"
+#import "schema.typ"
\ No newline at end of file
diff --git a/src/range.typ b/src/range.typ
new file mode 100644
index 0000000..96a7ce4
--- /dev/null
+++ b/src/range.typ
@@ -0,0 +1,65 @@
+#import "util.typ"
+
+#let key(start, end) = {
+  return str(start) + "->" + str(end)
+}
+
+#let bits(range) = {
+  return range.end - range.start + 1
+}
+
+#let parse-span(span) = {
+  let start-end = span.split("-")
+  if start-end.len() == 1 {
+    start-end.push(start-end.first())
+  }
+  let start = int(start-end.last())
+  let end = int(start-end.first())
+  return (start, end)
+}
+
+#let make(
+  start,
+  end,
+  name,
+  description: "",
+  values: none,
+  depends-on: none
+) = {
+  return (
+    start: start,
+    end: end,
+    name: name,
+    description: description,
+    values: values,
+    depends-on: depends-on,
+    last-value-y: -1
+  )
+}
+
+#let load(start, end, data) = {
+  let values = none
+  let bits = end - start + 1
+
+  if "values" in data {
+    values = (:)
+    for (val, desc) in data.values {
+      val = util.z-fill(val, bits)
+      values.insert(val, desc)
+    }
+  }
+
+  let depends-on = data.at("depends-on", default: none)
+  if depends-on != none {
+    depends-on = parse-span(str(depends-on))
+  }
+
+  return make(
+    start,
+    end,
+    str(data.name),
+    description: data.at("description", default: ""),
+    values: values,
+    depends-on: depends-on
+  )
+}
\ No newline at end of file
diff --git a/src/renderer.typ b/src/renderer.typ
new file mode 100644
index 0000000..9223138
--- /dev/null
+++ b/src/renderer.typ
@@ -0,0 +1,467 @@
+#import "@preview/cetz:0.2.2": canvas, draw
+
+#import "range.typ" as rng
+#import "structure.typ"
+#import "vec.typ"
+
+#let draw-rect(color, x, y, width, height, thickness: 0) = {
+  let fill = none
+  let stroke = color + thickness * 1pt
+  if thickness == 0 {
+    fill = color
+    stroke = none
+  }
+  draw.rect((x, -y), (x + width, -y - height), fill: fill, stroke: stroke)
+}
+
+#let draw-text(
+  txt,
+  color,
+  x,
+  y,
+  anchor: "center",
+  font: none,
+  italic: false,
+  size: 1em,
+  fill: none
+) = {
+  let text-params = (:)
+  if font != none {
+    text-params.insert("font", font)
+  }
+  if italic {
+    text-params.insert("style", "italic")
+  }
+  
+  let content-params = (:)
+  if fill != none {
+    content-params.insert("fill", fill)
+    content-params.insert("frame", "rect")
+    content-params.insert("padding", 4pt)
+  }
+
+  draw.content(
+    (x, -y),
+    text(txt, fill: color, size: size, ..text-params),
+    anchor: anchor,
+    stroke: none,
+    ..content-params
+  )
+}
+
+#let draw-line(color, a, b) = {
+  let (x0, y0) = a
+  let (x1, y1) = b
+  draw.line((x0, -y0), (x1, -y1), stroke: color)
+}
+
+#let draw-lines(color, ..pts) = {
+  let pts = pts.pos().map(pt => (pt.at(0), -pt.at(1)))
+  draw.line(..pts, stroke: color)
+}
+
+#let draw-poly(color, ..pts, thickness: 0) = {
+  let pts = pts.pos().map(pt => (pt.at(0), -pt.at(1)))
+  let params = (
+    stroke: (paint: color, thickness: thickness),
+    fill: none
+  )
+  if thickness == 0 {
+    params = (
+      stroke: none,
+      fill: color
+    )
+  }
+  draw.line(..pts, ..params)
+}
+
+#let draw-underbracket(config, start, end, bits-y) = {
+  let bit-w = config.bit-width
+  let bit-h = config.bit-height
+
+  let x0 = start + bit-w / 2
+  let x1 = end - bit-w / 2
+  let y0 = bits-y + bit-h * 1.25
+  let y1 = bits-y + bit-h * 1.5
+
+  let col = config.link-color
+  draw-lines(col, (x0, y0), (x0, y1), (x1, y1), (x1, y0))
+}
+
+#let draw-link(
+  config,
+  start-x,
+  start-y,
+  end-x,
+  end-y
+) = {
+  let bit-h = config.bit-height
+  let arrow-margin = config.arrow-margin
+
+  if end-x > start-x {
+    end-x -= arrow-margin
+  } else {
+    end-x += arrow-margin
+  }
+
+  draw-lines(
+    config.link-color,
+    (start-x, start-y + bit-h * 1.5),
+    (start-x, end-y + bit-h / 2),
+    (end-x, end-y + bit-h / 2),
+  )
+}
+
+#let draw-values(config, values, desc-x, desc-y) = {
+  let shapes = ()
+  let txt-col = config.text-color
+  let bit-w = config.bit-height  // Why ? I don't remember
+  let gap = config.values-gap
+  
+  for (val, desc) in values.pairs().sorted(key: p => p.first()) {
+    desc-y += gap
+    let txt = val + " = " + desc
+    shapes += draw-text(
+      txt, txt-col, desc-x + bit-w / 2, desc-y,
+      anchor: "north-west",
+      font: config.italic-font-family,
+      italic: true,
+      size: config.italic-font-size
+    )
+    desc-y += 8  // TODO: change this
+  }
+
+  return (shapes, desc-x, desc-y)
+}
+
+#let draw-description(
+  config,
+  range_,
+  start-x,
+  start-y,
+  width,
+  desc-x,
+  desc-y
+) = {
+  let shapes = ()
+  let bit-w = config.bit-width
+  let bit-h = config.bit-height
+
+  if config.left-labels {
+    desc-x = calc.min(desc-x, start-x + width / 2 - bit-w)
+  } else {
+    desc-x = calc.max(desc-x, start-x + width / 2 + bit-w)
+  }
+
+  shapes += draw-underbracket(config, start-x, start-x + width, start-y)
+
+  let mid-x = start-x + width / 2
+  shapes += draw-link(config, mid-x, start-y, desc-x, desc-y)
+
+  let txt-anchor = "west"
+
+  if config.left-labels {
+    txt-anchor -= "east"
+  }
+
+  shapes += draw-text(
+    range_.description,
+    config.text-color,
+    desc-x, desc-y + bit-h / 2,
+    anchor: "west"
+  )
+
+  // TODO: change this
+  desc-y += 18
+
+  if range_.values != none and range_.depends-on == none {
+    let shapes_
+    (shapes_, _, desc-y) = draw-values(config, range_.values, desc-x, desc-y)
+    shapes += shapes_
+  }
+
+  desc-y += config.description-margin
+
+  return (shapes, desc-x, desc-y)
+}
+
+#let draw-arrow(config, start-x, start-y, end-x, end-y, label: "") = {
+  let shapes = ()
+  let dash-len = config.dash-length
+  let dash-space = config.dash-space
+  let arrow-size = config.arrow-size
+  let link-col = config.link-color
+  let txt-col = config.text-color
+  let arrow-label-dist = config.arrow-label-distance
+
+  let start = vec.vec(start-x, start-y)
+  let end = vec.vec(end-x, end-y)
+  let start-end = vec.sub(end, start)
+  let d = vec.normalize(start-end)
+
+  let dashes = int(vec.mag(start-end) / (dash-len + dash-space))
+
+  for i in range(dashes) {
+    let a = vec.add(
+      start,
+      vec.mul(d, i * (dash-len + dash-space))
+    )
+    let b = vec.add(
+      a,
+      vec.mul(d, dash-len)
+    )
+
+    shapes += draw-line(link-col, (a.x, a.y), (b.x, b.y))
+  }
+
+  let n = vec.vec(d.y, -d.x)
+  let width = arrow-size / 1.5
+  let p1 = vec.sub(
+    end,
+    vec.sub(
+      vec.mul(d, arrow-size),
+      vec.mul(n, width)
+    )
+  )
+  let p2 = vec.sub(
+    end,
+    vec.add(
+      vec.mul(d, arrow-size),
+      vec.mul(n, width)
+    )
+  )
+
+  shapes += draw-poly(
+    link-col,
+    (end.x, end.y),
+    (p1.x, p1.y),
+    (p2.x, p2.y)
+  )
+
+  if label != "" {
+    shapes += draw-text(
+      label,
+      txt-col,
+      (start.x + end.x) / 2,
+      (start.y + end.y) / 2 + arrow-label-dist,
+      anchor: "north"
+    )
+  }
+
+  return shapes
+}
+
+#let draw-dependency(
+  draw-struct, config,
+  struct, structures, bits-x, bits-y, range_, desc-x, desc-y
+) = {
+  let shapes = ()
+
+  let bit-w = config.bit-width
+  let bit-h = config.bit-height
+  let arrow-margin = config.arrow-margin
+
+  let start-i = struct.bits - range_.end - 1
+  let start-x = bits-x + start-i * bit-w
+  let width = rng.bits(range_) * bit-w
+
+  shapes += draw-underbracket(config, start-x, start-x + width, bits-y)
+  let depend-range = struct.ranges.at(rng.key(..range_.depends-on))
+  let prev-range-y = bits-y + bit-h * 1.5
+
+  let prev-depend-y = if depend-range.last-value-y == -1 {
+    bits-y + bit-h * 1.5
+  } else {
+    depend-range.last-value-y
+  }
+
+  let depend-start-i = struct.bits - depend-range.end - 1
+  let depend-start-x = bits-x + depend-start-i * bit-w
+  let depend-width = rng.bits(depend-range) * bit-w
+  let depend-mid = depend-start-x + depend-width / 2
+  shapes += draw-underbracket(config, depend-start-x, depend-start-x + depend-width, bits-y)
+
+  for (val, data) in range_.values.pairs().sorted(key: p => p.first()) {
+    shapes += draw-arrow(config, depend-mid, prev-depend-y, depend-mid, desc-y - arrow-margin)
+
+    let val-ranges = (:)
+    for i in range(rng.bits(depend-range)) {
+      val-ranges.insert(
+        str(depend-range.end - i),
+        (name: val.at(i))
+      )
+    }
+
+    let val-struct = (
+      bits: rng.bits(depend-range),
+      start: depend-range.start,
+      ranges: val-ranges
+    )
+    val-struct = structure.load("", val-struct)
+
+    let shapes_
+    (shapes_, ..) = draw-struct(config, val-struct, structures, ox: depend-start-x, oy: desc-y)
+    shapes += shapes_
+
+    let y = desc-y + bit-h * 1.5
+
+    let x1
+    let x2
+
+    // Arrow from left to right
+    if depend-range.end > range_.start {
+      x1 = depend-start-x + depend-width + arrow-margin
+      x2 = start-x - arrow-margin
+    
+    // Arrow from right to left
+    } else {
+      x1 = depend-start-x - arrow-margin
+      x2 = start-x + width + arrow-margin
+    }
+
+    shapes += draw-arrow(config, x1, y, x2, y, label: data.description)
+    shapes += draw-arrow(config,
+      start-x + width - bit-w,
+      prev-range-y,
+      start-x + width - bit-w,
+      desc-y + bit-h - arrow-margin
+    )
+
+    prev-depend-y = desc-y + bit-h * 2 + arrow-margin
+    prev-range-y = prev-depend-y
+    depend-range.last-value-y = prev-depend-y
+
+    (shapes_, desc-y) = draw-struct(config, structures.at(data.structure), structures, ox: start-x, oy: desc-y)
+    shapes += shapes_
+  }
+
+  return (shapes, desc-x, desc-y)
+}
+
+#let draw-structure(config, struct, structures, ox: 0, oy: 0) = {
+  let shapes
+  let bg-col = config.background
+  let txt-col = config.text-color
+  let border-col = config.border-color
+  let bit-w = config.bit-width
+  let bit-h = config.bit-height
+
+  let (bits-x, bits-y) = (ox, oy + bit-h)
+  let bits-width = struct.bits * bit-w
+  let start-bit = struct.start
+
+  // Draw rectangle around structure
+  shapes += draw-rect(border-col, bits-x, bits-y, bits-width, bit-h, thickness: 2)
+
+  for i in range(struct.bits) {
+    let bit-x = ox + i * bit-w
+    shapes += draw-text(
+      str(struct.bits - i - 1 + start-bit),
+      txt-col,
+      bit-x + bit-w / 2,
+      oy + bit-h / 2 
+    )
+
+    // Draw separator
+    if i != 0 {
+      shapes += draw-line(border-col, (bit-x, bits-y), (bit-x, bits-y + bit-h))
+    }
+  }
+
+  let ranges = structure.get-sorted-ranges(struct)
+  if config.left-labels {
+    ranges = ranges.rev()
+  }
+
+  let desc-x
+  if config.force-descs-on-side {
+    desc-x = config.margins.at(3) + structures.main.bits * bit-w
+    if config.left-labels {
+      desc-x = config.width - desc-x
+    }
+  } else {
+    desc-x = ox
+    if config.left-labels {
+      desc-x += struct.bits * bit-w
+    }
+  }
+
+  let desc-y = bits-y + bit-h * 2
+
+  // Names + simple descriptions
+  for range_ in ranges {
+    let start-i = struct.bits - range_.end + start-bit - 1
+    let start-x = bits-x + start-i * bit-w
+    let width = rng.bits(range_) * bit-w
+
+    let name-x = start-x + width / 2
+    let name-y = bits-y + bit-h / 2
+    
+    shapes += draw-text(range_.name, txt-col, name-x, name-y, fill: bg-col)
+    
+    if range_.description != "" {
+      //draw.circle((desc-x, -desc-y), radius: 5, fill: red)
+      let shapes_
+      (shapes_, desc-x, desc-y) = draw-description(
+        config, range_, start-x, bits-y, width, desc-x, desc-y
+      )
+      shapes += shapes_
+    }
+  }
+
+  // Dependencies
+  for range_ in ranges {
+    if range_.values() != none and range_.depends-on != none {
+      let shapes_
+      (shapes_, desc-x, desc-y) = draw-dependency(
+        draw-structure, config,
+        struct, structures, bits-x, bits-y, range_, desc-x, desc-y
+      )
+      shapes += shapes_
+    }
+  }
+
+  return (shapes, desc-y)
+}
+
+#let render(config, structures) = {
+  set text(
+    font: config.default-font-family,
+    size: config.default-font-size
+  )
+
+  let main = structures.main
+  let ox = config.margins.at(3)
+  if config.left-labels {
+    ox = config.width - ox - main.bits * config.bit-width
+  }
+
+  let params = if config.full-page {
+    (
+      width: auto,
+      height: auto,
+      fill: config.background
+    )
+  } else {
+    (:)
+  }
+
+  set page(..params)
+
+  canvas(length: 1pt, background: config.background, {
+    let (shapes, _) = draw-structure(
+      config, main, structures,
+      ox: ox,
+      oy: config.margins.at(0)
+    )
+    shapes
+    //draw.circle((300, -3000), fill: red, radius: 2)
+  })
+}
+
+#let make(config) = {
+  return (
+    config: config,
+    render: render.with(config)
+  )
+}
\ No newline at end of file
diff --git a/src/schema.typ b/src/schema.typ
new file mode 100644
index 0000000..8abd894
--- /dev/null
+++ b/src/schema.typ
@@ -0,0 +1,50 @@
+#import "config.typ" as conf
+#import "renderer.typ"
+#import "structure.typ"
+
+#let valid-extensions = ("yaml", "json", "xml")
+
+#let parse-xml(path) = {
+  panic("TODO")
+}
+
+#let parse-file(path) = {
+  let ext = path.split(".").last()
+
+  if not ext in valid-extensions {
+    let fmts = valid-extensions.map(fmt => "." + fmt).join(", ")
+    fmts = "(" + fmts + ")"
+    panic("." + ext + " files are not supported. Valid formats: " + fmts)
+  }
+
+  if ext == "yaml" {
+    return yaml(path)
+  } else if ext == "json" {
+    return json(path)
+  } else if ext == "xml" {
+    return parse-xml(path)
+  }
+}
+
+#let load(path-or-schema, config: auto) = {
+  let schema = if type(path-or-schema) == str {
+    parse-file(path-or-schema)
+  } else {
+    parse-raw(path-or-schema)
+  }
+
+  let structures = (:)
+  for (id, data) in schema.structures {
+    id = str(id)
+    structures.insert(id, structure.load(id, data))
+  }
+  return structures
+}
+
+#let render(structures, config: auto) = {
+  if config == auto {
+    config = conf.config()
+  }
+  let renderer_ = renderer.make(config)
+  (renderer_.render)(structures)
+}
\ No newline at end of file
diff --git a/src/structure.typ b/src/structure.typ
new file mode 100644
index 0000000..21b4430
--- /dev/null
+++ b/src/structure.typ
@@ -0,0 +1,54 @@
+#import "range.typ"
+#import "util.typ"
+
+#let make(
+  name,
+  bits,
+  ranges,
+  start: 0
+) = {
+  return (
+    name: name,
+    bits: bits,
+    ranges: ranges,
+    start: start
+  )
+}
+
+#let load(id, data) = {
+  let struct = (id: id)
+  let ranges = (:)
+
+  for (range-span, range-data) in data.ranges {
+    let (start, end) = range.parse-span(str(range-span))
+    ranges.insert(
+      range.key(start, end),
+      range.load(start, end, range-data)
+    )
+  }
+
+  for range_ in ranges.values() {
+    if range_.values != none and range_.depends-on != none {
+      let depends-key = range.key(..range_.depends-on)
+      let depends-range = ranges.at(depends-key)
+      let bits = range.bits(depends-range)
+      let values = (:)
+      for (v, d) in range_.values {
+        v = util.z-fill(str(int(v)), bits)
+        values.insert(v, d)
+      }
+    }
+  }
+
+  return make(
+    id,
+    int(data.bits),
+    ranges,
+    start: data.at("start", default: 0)
+  )
+}
+
+#let get-sorted-ranges(struct) = {
+  let ranges = struct.ranges.values()
+  return ranges.sorted(key: r => r.end)
+}
\ No newline at end of file
diff --git a/src/util.typ b/src/util.typ
new file mode 100644
index 0000000..c005085
--- /dev/null
+++ b/src/util.typ
@@ -0,0 +1,4 @@
+#let z-fill(string, length) = {
+  let filled = "0" * length + string
+  return filled.slice(-length)
+}
\ No newline at end of file
diff --git a/src/vec.typ b/src/vec.typ
new file mode 100644
index 0000000..be36786
--- /dev/null
+++ b/src/vec.typ
@@ -0,0 +1,44 @@
+#let vec(x, y) = {
+  return (x: x, y: y)
+}
+
+#let add(v1, v2) = {
+  return vec(
+    v1.x + v2.x,
+    v1.y + v2.y
+  )
+}
+
+#let sub(v1, v2) = {
+  return vec(
+    v1.x - v2.x,
+    v1.y - v2.y
+  )
+}
+
+#let mul(v, f) = {
+  return vec(
+    v.x * f,
+    v.y * f
+  )
+}
+
+#let div(v, f) = {
+  return vec(
+    v.x / f,
+    v.y / f
+  )
+}
+
+#let mag(v) = {
+  return calc.sqrt(v.x * v.x + v.y * v.y)
+}
+
+#let normalize(v) = {
+  let m = mag(v)
+
+  if m == 0 {
+    return (x: 0, y: 0)
+  }
+  return div(v, m)
+}
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