{"header":{"message":"first record","description":null,"timestamp":"2021-07-14T07:51:54.788801Z","authors":[{}]},"hash":"UXXODJQ6GQXOCZYBAVP6XJ4CNOK2QCZFFZBLSU2Q5V4WZRDGMRZAC","authors":[{"login":"ammkrn","key":"8pRcgpBDWybJEh4eZbHW8iV75uVLVJ5dkoYnwL7kkMgE"}],"deps":{"hashes":[["UXXODJQ6GQXOCZYBAVP6XJ4CNOK2QCZFFZBLSU2Q5V4WZRDGMRZAC","first record"],["AA",null]],"deps":[],"known":[]},"hunks":[{"FileAdd":{"meta":{"basename":"leanpkg.toml","metadata":0},"context":[{"change":1,"pos":0}],"contents":[{"Add":"[package]"},{"Add":"name = \"Printiest\""},{"Add":"version = \"0.1\""},{"Add":"lean_version = \"leanprover/lean4:nightly-2021-04-26\""}]}},{"FileAdd":{"meta":{"basename":"README.md","metadata":0},"context":[{"change":1,"pos":0}],"contents":[{"Add":"# What is this?"},{"Add":""},{"Add":"A general algebraic [pretty-printer](https://en.wikipedia.org/wiki/Prettyprint#Programming_code_formatting) for [Lean 4](https://github.com/leanprover/lean4) using ideas from Jean-Philippe Bernardy's [Prettiest](https://github.com/jyp/prettiest). Bernardy also acknowledges work by Podkopaev, Boulytchev, Azero, and Swierstra in the addendum to [his paper](https://jyp.github.io/pdf/Prettiest.pdf). Broadly, the idea with this style of printer is that the library can save the user a lot of guesswork by doing some measuring/calculating to figure out the most optimal way to render a document, according to three very general principles:"},{"Add":""},{"Add":"```"},{"Add":"1. Visibility: The printer will fit its output within the specified render width*"},{"Add":"2. Legibility: The printer will respect the user's layout choices (groups)"},{"Add":"3. Frugality: The printer will use as few lines as possible while respecting 1 and 2."},{"Add":""},{"Add":"* The printer won't break up individual strings given by the user, so if you pass an 80 character string and specify a render width of 10, principle 1 will be violated (though only in that one spot)"},{"Add":"```"},{"Add":""},{"Add":"Bernardy's insight was that while a naive implementation runs in exponential time, clever (but not complicated) pruning of the space of possible layouts makes things more or less linear (see the paper for details/graphs about this)."},{"Add":""},{"Add":"--- "},{"Add":""},{"Add":"This implementation adds a third (optional) group choice for laying out segments of human-language text, and changes the implementation of the measuring and rendering so that the two phases are completely separate, which allows the final output to be written directly to an output stream rather than building up the whole output string in memory, then writing the string somewhere. "},{"Add":""},{"Add":"Much of the Lean community (myself included) has yet to really explore the performance characteristics of Lean 4 and the language primitives, but the compiled version of this already performs very well compared to a very similar Rust implementation and Bernardy's Haskell version (which has more implementation differences, so a little bit apples to oranges)."},{"Add":""},{"Add":"## How do I use it?"},{"Add":""},{"Add":"Full examples of the printer's use can be found in the `Tests` module. Conceptually, the thing you want to print is built up by combining `Doc` elements which you then render to either a string with `Doc.renderString `, or to an output stream with `Doc.renderStream `."},{"Add":""},{"Add":"There are three infix operators:"},{"Add":"```"},{"Add":"x <> y -- concatenate x and y"},{"Add":"x <+> y -- concatenate x and y, with a space between"},{"Add":"x y -- vertically concatenate x and y"},{"Add":"```"},{"Add":""},{"Add":"The main ways in which this (and Prettiest) differs from something like a Wadler/Leijen style printer is that the `Group` node does more of the work for you (you can still force a node to render as a certain orientation if you want), and for docs > 1 line in height, concatenation is \"tetris-like\". For existing programs that depend on \"classic\" concatenation, you can still achieve the same results by changing the manner in which the doc is built up in your program."},{"Add":""},{"Add":"## Future work"},{"Add":""},{"Add":"+ Adding an annotation system."},{"Add":""},{"Add":"+ Figuring out what API/integration to offer for external code or document formatters."},{"Add":""},{"Add":"+ Figuring out the best way to make use of buffered streams/writers in Lean 4."},{"Add":""},{"Add":"+ While work on verification is sort of blocked until well-founded recursion is implemented and the `partial` functions can be removed, it would be interesting to have a verified pretty-printer. It seems like the relevant correctness properties are:"},{"Add":""},{"Add":"1. That all of the Text nodes in a Doc tree are present in the output"},{"Add":"2. That the rendered text appears in the correct order "},{"Add":""},{"Add":"As long as you can show that all of the intended text made it into the output string, and did so in the right order, it seems like everything else is just a matter of taste, but if anyone knows more about this hit me up. "},{"Add":""},{"Add":"## Examples"},{"Add":""},{"Add":"The full set of examples can be seen in the `Tests` module. The real strength of this printer is the versatility and ease of use of the `Group` node, and the way it automatically adjusts the rendering to fit the desired render width (users can still exert manual control over group rendering when they want to). For example, function for rendering generic S-expressions is extremely simple...:"},{"Add":""},{"Add":"```"},{"Add":"partial def Sexpr.pretty : Sexpr -> Doc"},{"Add":"| atom s => Doc.Text s"},{"Add":"| list es => "},{"Add":" let inner := Doc.group (es.map pretty) \" \""},{"Add":" \"(\" <> inner <> \")\""},{"Add":"```"},{"Add":""},{"Add":"But it will produce nice outputs automatically for different render widths, while leaving users the option of forcing a horizontal/vertical orientation to accomodate things like code formatters."},{"Add":""},{"Add":"```"},{"Add":"-- render width := 80 "},{"Add":""},{"Add":"((abcde ((a b c d) (a b c d) (a b c d) (a b c d)))"},{"Add":" (abcdefgh ((a b c d) (a b c d) (a b c d) (a b c d))))"},{"Add":""},{"Add":""},{"Add":"-- render width := 40 "},{"Add":""},{"Add":"((abcde ((a b c d)"},{"Add":" (a b c d)"},{"Add":" (a b c d)"},{"Add":" (a b c d)))"},{"Add":" (abcdefgh ((a b c d)"},{"Add":" (a b c d)"},{"Add":" (a b c d)"},{"Add":" (a b c d))))"},{"Add":""},{"Add":""},{"Add":"-- render width := 15"},{"Add":""},{"Add":"((abcde"},{"Add":" ((a b c d)"},{"Add":" (a b c d)"},{"Add":" (a b c d)"},{"Add":" (a b c d)))"},{"Add":" (abcdefgh"},{"Add":" ((a b c d)"},{"Add":" (a b c d)"},{"Add":" (a b c d)"},{"Add":" (a b c d))))"},{"Add":"```"},{"Add":""},{"Add":"Recreating a portion of the `git --help` output, showing the ability to render a CLI in a manner suited to a user's detected terminal width."},{"Add":""},{"Add":"```"},{"Add":"-- render width := 80"},{"Add":""},{"Add":"usage: git [--version] [--help] [-C ] [-c =]"},{"Add":" [--exec-path[=]] [--html-path] [--man-path] [--info-path]"},{"Add":" [--p|--paginate|-P|--no-pager] [--no-replace-objects] [--bare]"},{"Add":" "},{"Add":" []"},{"Add":""},{"Add":"'git help -a' and 'git help -g' list available subcommands and some"},{"Add":"concept guides. See 'git help ' or 'git help ' to read"},{"Add":"about a specific subcommand or concept. See 'git help git' for an overview"},{"Add":"of the system."},{"Add":""},{"Add":"-- render width := 40"},{"Add":""},{"Add":"usage:"},{"Add":" git [--version] [--help]"},{"Add":" [-C ] [-c =]"},{"Add":" [--exec-path[=]] [--html-path]"},{"Add":" [--man-path] [--info-path]"},{"Add":" [--p|--paginate|-P|--no-pager]"},{"Add":" [--no-replace-objects] [--bare]"},{"Add":" "},{"Add":" []"},{"Add":""},{"Add":"'git help -a' and 'git help -g' list"},{"Add":"available subcommands and some concept"},{"Add":"guides. See 'git help ' or 'git"},{"Add":"help ' to read about a specific"},{"Add":"subcommand or concept. See 'git help"},{"Add":"git' for an overview of the system."},{"Add":""},{"Add":""},{"Add":"-- render width := 20"},{"Add":""},{"Add":"usage:"},{"Add":" git [--version]"},{"Add":" [--help]"},{"Add":" [-C ]"},{"Add":" [-c =]"},{"Add":" [--exec-path[=]]"},{"Add":" [--html-path]"},{"Add":" [--man-path]"},{"Add":" [--info-path]"},{"Add":" [--p|--paginate|-P|--no-pager]"},{"Add":" [--no-replace-objects]"},{"Add":" [--bare]"},{"Add":" "},{"Add":" []"},{"Add":""},{"Add":"'git help"},{"Add":"-a' and"},{"Add":"'git help"},{"Add":"-g' list"},{"Add":"available"},{"Add":"subcommands"},{"Add":"and some"},{"Add":"concept"},{"Add":"guides. See"},{"Add":"'git help"},{"Add":"'"},{"Add":"or 'git"},{"Add":"help"},{"Add":"'"},{"Add":"to read"},{"Add":"about a"},{"Add":"specific"},{"Add":"subcommand"},{"Add":"or concept."},{"Add":"See 'git"},{"Add":"help git'"},{"Add":"for an"},{"Add":"overview of"},{"Add":"the"},{"Add":"system."},{"Add":"```"},{"Add":""},{"Add":"## License"},{"Add":""},{"Add":"Users are free to copy/distribute/modify this software according to the terms of either the Apache 2.0 license (to match Lean 4), or the GPLv3 (to match Prettiest). Most people will choose Apache 2.0, but licensees who would like to incorporate this in a larger GPL codebase will want to choose the GPLv3 option. Contributions will be accepted under the same dual-license arrangement. "}]}},{"FileAdd":{"meta":{"basename":"Printiest.lean","metadata":0},"context":[{"change":1,"pos":0}],"contents":[{"Add":"import Printiest.Tests"},{"Add":""},{"Add":"def main : IO Unit := "},{"Add":" IO.Prim.getStdout >>= bigSexpr2.pretty.renderStream 80"}]}},{"FileAdd":{"meta":{"basename":"Printiest","metadata":576},"context":[{"change":1,"pos":0}],"contents":[]}},{"FileAdd":{"meta":{"basename":"Util.lean","metadata":0},"context":[{"change":0,"pos":7585}],"contents":[{"Add":" "},{"Add":"inductive Choice"},{"Add":"| H : Nat -> Choice"},{"Add":"| V : Nat -> Choice"},{"Add":"| T : Choice"},{"Add":""},{"Add":"instance : Inhabited Choice := ⟨Choice.H 0⟩"},{"Add":""},{"Add":"def Choice.toString (c : Choice) : String :="},{"Add":" match c with"},{"Add":" | Choice.H n => s!\"H({n})\""},{"Add":" | Choice.V n => s!\"V({n})\""},{"Add":" | Choice.T => \"T\""},{"Add":"instance : ToString Choice := ⟨Choice.toString⟩"},{"Add":""},{"Add":"/-"},{"Add":"Side and Spaces are helper types to keep track of info during rendering; "},{"Add":"we need these to allow for streaming output."},{"Add":""},{"Add":"Side keeps track of whether we're on the left or right side of a Concat"},{"Add":"so we can determine how linebreaks/flushes should behave."},{"Add":""},{"Add":"Spaces determines whether a given indentation is actually supposed to be"},{"Add":"rendered or not."},{"Add":"-/"},{"Add":"inductive Side"},{"Add":"| Left : Side"},{"Add":"| Right : Side"},{"Add":""},{"Add":"instance : Inhabited Side := ⟨Side.Left⟩"},{"Add":""},{"Add":"inductive Spaces"},{"Add":"| Hot : Nat -> Spaces"},{"Add":"| Cold : Nat -> Spaces"},{"Add":""},{"Add":"instance : Inhabited Spaces := ⟨Spaces.Cold 0⟩ "},{"Add":""},{"Add":"def Spaces.toHot : Spaces -> Spaces "},{"Add":"| Hot n => Hot n"},{"Add":"| Cold n => Hot n"},{"Add":""},{"Add":"def Spaces.toCold : Spaces -> Spaces "},{"Add":"| Hot n => Cold n"},{"Add":"| Cold n => Cold n"},{"Add":""},{"Add":"def Spaces.toNat : Spaces -> Nat"},{"Add":"| Hot n => n"},{"Add":"| Cold n => n"},{"Add":""},{"Add":"def Spaces.isHot : Spaces -> Bool"},{"Add":"| Hot _ => true"},{"Add":"| Cold _ => false"},{"Add":""},{"Add":"def Spaces.isCold (s : Spaces) : Bool := !s.isHot"},{"Add":""},{"Add":"open Spaces Side"},{"Add":""},{"Add":"structure RenderState (A : Type) where"},{"Add":"(sink: A)"},{"Add":"(choices: List Choice)"},{"Add":"(side: Side)"},{"Add":"(spaces: Spaces)"},{"Add":""},{"Add":"instance {A : Type} : Stream (RenderState A) Choice where"},{"Add":" next? rs :="},{"Add":" match rs.choices with"},{"Add":" | [] => none"},{"Add":" | hd :: tl => some (hd, { rs with choices := tl })"},{"Add":""},{"Add":"def RenderState.new {A : Type} (a : A) (choices: List Choice) : RenderState A := "},{"Add":" ⟨a, choices, Left, Cold 0⟩"},{"Add":""},{"Add":"instance : Inhabited (RenderState String) := ⟨RenderState.new \"\" []⟩"},{"Add":""},{"Add":"structure Options where"},{"Add":"(width : Nat)"},{"Add":""},{"Add":"class HasWrite (σ : Type) (m : Type -> Type v) where"},{"Add":"(tell : String -> StateT (RenderState σ) m Unit)"},{"Add":""},{"Add":"instance : HasWrite String Id := {"},{"Add":" tell := fun s => fun st => return ((), { st with sink := st.sink.append s })"},{"Add":"}"},{"Add":""},{"Add":"instance : HasWrite IO.FS.Stream IO := {"},{"Add":" tell := "},{"Add":" fun s st => do"},{"Add":" st.sink.write s.toUTF8"},{"Add":" return ((), st)"},{"Add":"}"}]}},{"FileAdd":{"meta":{"basename":"Tests.lean","metadata":0},"context":[{"change":0,"pos":7585}],"contents":[{"Add":"import Printiest.Doc"},{"Add":""},{"Add":"open Doc"},{"Add":""},{"Add":"inductive Sexpr"},{"Add":"| atom : String -> Sexpr"},{"Add":"| list : Array Sexpr -> Sexpr"},{"Add":""},{"Add":"instance : Inhabited Sexpr := ⟨Sexpr.atom \"default\"⟩"},{"Add":"instance : Coe String Sexpr := ⟨Sexpr.atom⟩"},{"Add":""},{"Add":"partial def Sexpr.pretty : Sexpr -> Doc"},{"Add":"| atom s => Doc.Text s"},{"Add":"| list es => "},{"Add":" let inner := Doc.group (es.map pretty) \" \""},{"Add":" \"(\" <> inner <> \")\""},{"Add":""},{"Add":"open Sexpr"},{"Add":""},{"Add":"def abcd : Sexpr := list #[\"a\", \"b\", \"c\", \"d\"]"},{"Add":"def abcd4 : Sexpr := list #[abcd, abcd, abcd, abcd]"},{"Add":""},{"Add":"def anSexpr : Sexpr := list #["},{"Add":" list #[\"abcde\", abcd4],"},{"Add":" list #[\"abcdefgh\", abcd4]"},{"Add":"]"},{"Add":""},{"Add":"-- The canonical \"Prettiest\" Sexpr demo"},{"Add":"#eval IO.Prim.getStdout >>= anSexpr.pretty.renderStream 15"},{"Add":"#eval IO.Prim.getStdout >>= anSexpr.pretty.renderStream 40"},{"Add":"#eval IO.Prim.getStdout >>= anSexpr.pretty.renderStream 80"},{"Add":""},{"Add":"def bigSexpr0 := list #[anSexpr, anSexpr, anSexpr, anSexpr]"},{"Add":"def bigSexpr1 := list #[bigSexpr0, bigSexpr0, bigSexpr0, bigSexpr0]"},{"Add":"-- Don't bother trying to print these larger ones interactively (use leanpkg build bin)"},{"Add":"def bigSexpr2 := list #[bigSexpr1, bigSexpr1, bigSexpr1, bigSexpr1]"},{"Add":"def bigSexpr3 := list #[bigSexpr2, bigSexpr2, bigSexpr2, bigSexpr2]"},{"Add":"def bigSexpr4 := list #[bigSexpr3, bigSexpr3, bigSexpr3, bigSexpr3]"},{"Add":"def bigSexpr5 := list #[bigSexpr4, bigSexpr4, bigSexpr4, bigSexpr4]"},{"Add":"def bigSexpr6 := list #[bigSexpr5, bigSexpr5]"},{"Add":"def bigSexprTest (w : Nat) := bigSexpr6.pretty.renderString w"},{"Add":""},{"Add":"#eval IO.print (bigSexpr1.pretty.renderString 40)"},{"Add":""},{"Add":"-- Demo of the groupText thing."},{"Add":"def lorem := \"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.\""},{"Add":"#eval IO.Prim.getStdout >>= (groupTextFromString lorem).renderStream 20"},{"Add":"#eval IO.Prim.getStdout >>= (groupTextFromString lorem).renderStream 40"},{"Add":"#eval IO.Prim.getStdout >>= (groupTextFromString lorem).renderStream 80"},{"Add":""},{"Add":"namespace test1"},{"Add":"def L : Doc := \"points:\""},{"Add":"def R := Doc.group #[\"1. first point\", \"2. second point\", \"3. third point\"] \" \""},{"Add":""},{"Add":"/-"},{"Add":"The two hang operators; \"alwaysHang\" and \"hang\", where the latter will only"},{"Add":"do hanging indentation if the given width can't fit everything on one line."},{"Add":"-/"},{"Add":"#eval IO.Prim.getStdout >>= (hang 4 L R).renderStream 80"},{"Add":"#eval IO.Prim.getStdout >>= (hang 4 L R).renderStream 20"},{"Add":"#eval IO.Prim.getStdout >>= (alwaysHang 4 L R).renderStream 80"},{"Add":"#eval IO.Prim.getStdout >>= (alwaysHang 4 L R).renderStream 20"},{"Add":"end test1"},{"Add":""},{"Add":"/-"},{"Add":"When there are linebreaks introduced by Flush/vConcat, concatenation"},{"Add":"becomes \"tetris-style\", which is nice for code formatting."},{"Add":"-/"},{"Add":"def tetrisDemo1 : Doc := (\"xxxxxxxx\" \"xxxx\") <> (\"########\" \"####\") <> (\"........\" \"....\")"},{"Add":"#eval IO.print (tetrisDemo1.renderString 80)"},{"Add":""},{"Add":"def tetrisDemo2 : Doc := (\"abc\" \"d\") <> (\"ghi\" \"jkl\") <> (\"mno\" \"pqr\")"},{"Add":"#eval IO.print (tetrisDemo2.renderString 80)"},{"Add":""},{"Add":"/-"},{"Add":"If you want \"normal\" in-line concatenation, just don't use the newline operator (or otherwise insert a Flush)."},{"Add":"-/"},{"Add":"def concatDemo : Doc := (\"abc\" <> \"def\") <+> (\"ghi\" <> \"jkl\") <+> (\"mno\" <> \"pqr\")"},{"Add":"#eval IO.print (concatDemo.renderString 80)"},{"Add":""},{"Add":"def gitOptions : List String :="},{"Add":"["},{"Add":" \"[--version]\","},{"Add":" \"[--help]\","},{"Add":" \"[-C ]\","},{"Add":" \"[-c =]\","},{"Add":" \"[--exec-path[=]]\","},{"Add":" \"[--html-path]\","},{"Add":" \"[--man-path]\","},{"Add":" \"[--info-path]\","},{"Add":" \"[--p|--paginate|-P|--no-pager]\","},{"Add":" \"[--no-replace-objects]\","},{"Add":" \"[--bare]\""},{"Add":"]"},{"Add":""},{"Add":"def helpText := \"'git help -a' and 'git help -g' list available subcommands and some concept guides. See 'git help ' or 'git help ' to read about a specific subcommand or concept. See 'git help git' for an overview of the system.\""},{"Add":"def gitCli := "},{"Add":" let grp := group #[\"git\" <+> groupText gitOptions, \"\", \"[]\"] \" \""},{"Add":" --(hang 4 \"usage:\" (\"git\" <+> groupText gitOptions)) "},{"Add":" (hang 4 \"usage:\" grp)"},{"Add":" Nil "},{"Add":" groupTextFromString helpText"},{"Add":""},{"Add":"/-"},{"Add":"Recreates a portion of the `git --help` output showing the ability"},{"Add":"to render a CLI to best fit a given terminal width (ideally this would be"},{"Add":"read from the user's terminal and then printed accordingly)."},{"Add":"-/"},{"Add":"#eval IO.Prim.getStdout >>= gitCli.renderStream 80"},{"Add":"#eval IO.Prim.getStdout >>= gitCli.renderStream 40"},{"Add":"#eval IO.Prim.getStdout >>= gitCli.renderStream 20"},{"Add":""},{"Add":"-- Demo of the helper function for creating a separated and surrounded list of items."},{"Add":"#eval IO.Prim.getStdout >>= (Doc.encloseSep \"{\" (gitOptions.map (fun x => Doc.Text x)).toArray \",\" \"}\" 4).renderStream 40"},{"Add":""},{"Add":"-- Force a group to be horizontal"},{"Add":"def restrict_h := Doc.group (kind := GroupKind.horizontalCode) #[\"A\", \"B\", \"C\"] \", \""},{"Add":"#eval IO.Prim.getStdout >>= restrict_h.renderStream 1"},{"Add":""},{"Add":"-- Force a group to be vertical"},{"Add":"def restrict_v := Doc.group (kind := GroupKind.vertical) #[\"A\", \"B\", \"C\"] \" \""},{"Add":"#eval IO.Prim.getStdout >>= restrict_v.renderStream 40"},{"Add":""}]}},{"FileAdd":{"meta":{"basename":"Measure.lean","metadata":0},"context":[{"change":0,"pos":7585}],"contents":[{"Add":"import Std.Data.DList"},{"Add":"import Printiest.Util"},{"Add":""},{"Add":"open Std (DList)"},{"Add":""},{"Add":"/-"},{"Add":"Note: all of the comparisons (equality, LE, etc) use ONLY the"},{"Add":"measure's dimensions; we're not concerned with the choices."},{"Add":"-/"},{"Add":"structure Measure where"},{"Add":"(height : Nat)"},{"Add":"(maxWidth : Nat)"},{"Add":"(lastWidth : Nat)"},{"Add":"(choices : DList Choice)"},{"Add":""},{"Add":"instance Measure.Inhabited : Inhabited Measure where"},{"Add":" default := ⟨0, 0, 0, DList.empty⟩"},{"Add":""},{"Add":"instance : Ord Measure where"},{"Add":" compare a b :="},{"Add":" match Ord.compare a.height b.height with"},{"Add":" | Ordering.lt => Ordering.lt"},{"Add":" | Ordering.gt => Ordering.gt"},{"Add":" | Ordering.eq => "},{"Add":" match Ord.compare a.maxWidth b.maxWidth with"},{"Add":" | Ordering.lt => Ordering.lt"},{"Add":" | Ordering.gt => Ordering.gt"},{"Add":" | Ordering.eq => Ord.compare a.lastWidth b.lastWidth"},{"Add":""},{"Add":"instance : LE Measure :="},{"Add":" ⟨fun m1 m2 => "},{"Add":" match Ord.compare m1 m2 with"},{"Add":" | Ordering.lt => True"},{"Add":" | Ordering.eq => True"},{"Add":" | _ => False⟩"},{"Add":""},{"Add":"instance : LT Measure := ⟨fun m1 m2 => Ord.compare m1 m2 = Ordering.lt⟩"},{"Add":""},{"Add":"instance Measure.decLe (m1 m2 : Measure) : Decidable (LE.le m1 m2) := "},{"Add":" match h:Ord.compare m1 m2 with"},{"Add":" | Ordering.lt => by"},{"Add":" simp only [LE.le, h] "},{"Add":" exact (isTrue trivial)"},{"Add":" | Ordering.gt => by"},{"Add":" simp only [LE.le, h] "},{"Add":" exact (isFalse id)"},{"Add":" | Ordering.eq => by"},{"Add":" simp only [LE.le, h]"},{"Add":" exact (isTrue trivial)"},{"Add":""},{"Add":"def Measure.lt (s1 s2 : Measure) : Bool :="},{"Add":"match Ord.compare s1 s2 with"},{"Add":"| Ordering.lt => true"},{"Add":"| _ => false"},{"Add":""},{"Add":"def Measure.dominates (s t : Measure) : Bool := "},{"Add":" s.height <= t.height"},{"Add":" && s.maxWidth <= t.maxWidth"},{"Add":" && s.lastWidth <= t.lastWidth"},{"Add":""},{"Add":"def Measure.toString (m : Measure) : String := s!\"⟨{m.height}, {m.maxWidth}, {m.lastWidth}, {m.choices.toList}⟩\""},{"Add":"instance : ToString Measure := ⟨Measure.toString⟩"},{"Add":""},{"Add":"def Measure.beq (m1 m2 : Measure) : Bool := "},{"Add":" match Ord.compare m1 m2 with"},{"Add":" | Ordering.eq => true"},{"Add":" | _ => false"},{"Add":""},{"Add":"instance : BEq Measure := ⟨Measure.beq⟩"},{"Add":""},{"Add":"def Measure.text (s : String) : Measure := ⟨0, s.length, s.length, DList.empty⟩"},{"Add":""},{"Add":"def Measure.concat (l r : Measure) : Measure := "},{"Add":" ⟨l.height + r.height, "},{"Add":" l.maxWidth.max (l.lastWidth + r.maxWidth),"},{"Add":" l.lastWidth + r.lastWidth,"},{"Add":" l.choices ++ r.choices⟩"},{"Add":""},{"Add":"def Measure.flush (m : Measure) : Measure := ⟨m.height.succ, m.maxWidth, 0, m.choices⟩"},{"Add":""},{"Add":"def Measure.fits (m: Measure) (width : Nat) : Bool := m.maxWidth <= width"},{"Add":""},{"Add":"def Measure.cons (m : Measure) (c : Choice) : Measure := { m with choices := m.choices.cons c }"},{"Add":""},{"Add":"def Measure.vConcat (l r : Measure) : Measure := l.flush.concat r"},{"Add":""},{"Add":"/-"},{"Add":" the end goal is some document that's a combination of a, b, and c."},{"Add":" ["},{"Add":" possible layotus for a := [a1, a2, .. an]"},{"Add":" possible layouts for b := [b1, b2, .. bn]"},{"Add":" possible layouts for c := [c1, c2, .. cn]"},{"Add":" ]"},{"Add":""},{"Add":" For certain horizontal groups, all of the elements have to be zero height."},{"Add":""},{"Add":" If it turns out that (for example) there are no possibilities for `a` that are zero height,"},{"Add":" then we need to detect that and abandon the horizontal grouping altogether, using"},{"Add":" vertical grouping instead."},{"Add":"-/"},{"Add":"def zeroHeights (grps : Array (Nat × (Array Measure))) : Option (Array (Array Measure)) :="},{"Add":" let zeroes_only := grps.map (fun ⟨_, grp⟩ => grp.filterMap (fun s => if s.height = 0 then some s else none))"},{"Add":" if zeroes_only.any (fun grp => grp.size = 0) "},{"Add":" then none "},{"Add":" else some zeroes_only"},{"Add":""},{"Add":""},{"Add":"def arrayBind {A B : Type} (xs : Array A) (f : A -> Array B) : Array B :="},{"Add":" xs.foldl (fun sink next => sink ++ f next) #[]"},{"Add":""},{"Add":"/--"},{"Add":"from [x1, x2, .. xn], [y1, y2, .. yn] make [f x1 y1, f x1 y2, .. f xn yn] "},{"Add":"-/"},{"Add":"def flatCartesian {A B C : Type} (f : A -> B -> C) (xs : Array A) (ys : Array B) : Array C :="},{"Add":"arrayBind xs (fun x => ys.map (fun y => f x y))"},{"Add":""},{"Add":""},{"Add":"/--"},{"Add":"If there are any measure that fit in the specified width, keep only those."},{"Add":"If there aren't, keep the single least wide (the one that will overflow the least)"},{"Add":"-/"},{"Add":"partial def discardInvalid (w : Nat) (sils: Array Measure): Array Measure :="},{"Add":" let fit := sils.filter (fun s => s.fits w)"},{"Add":" if fit.size > 0 then fit else "},{"Add":" match sils.get? 0 with"},{"Add":" | none => panic \"discardInvalid should never get an empty array\""},{"Add":" | some hd => #[sils.foldl (fun least challenger => "},{"Add":" if challenger.maxWidth < least.maxWidth || (least.maxWidth = challenger.maxWidth && (least <= challenger))"},{"Add":" then challenger"},{"Add":" else least) hd]"},{"Add":""},{"Add":"/--"},{"Add":"Deduplicate a sorted array of measures"},{"Add":"-/"},{"Add":"partial def dedupSorted (rem: Array Measure) : Array Measure :="},{"Add":" let rec aux (n : Nat) (out: Array Measure) : Array Measure :="},{"Add":" match rem.get? n, rem.get? n.succ with"},{"Add":" | none, _ => out"},{"Add":" | some x, none => out.push x"},{"Add":" | some x, some y => if x != y then aux n.succ (out.push x) else aux n.succ out"},{"Add":" aux 0 #[]"},{"Add":""},{"Add":"/--"},{"Add":"From a list of measures, remove all those that are dominated "},{"Add":"since we know they're not going to give an optimal layout"},{"Add":"-/"},{"Add":"partial def dominant (rem: Array Measure) : Array Measure :="},{"Add":" let rec aux (n : Nat) (out : Array Measure) : Array Measure :="},{"Add":" match rem.get? n with"},{"Add":" | none => out"},{"Add":" | some x => if out.any (fun m => m.dominates x) then aux n.succ out else aux n.succ (out.push x)"},{"Add":" aux 0 #[]"},{"Add":""},{"Add":""},{"Add":"def sort (input : Array Measure) : Array Measure := input.qsort (fun m1 m2 => Measure.lt m1 m2)"},{"Add":""},{"Add":"def pareto (w : Nat) : Array Measure -> Array Measure := dominant ∘ dedupSorted ∘ sort ∘ (discardInvalid w)"},{"Add":""},{"Add":"/-"},{"Add":"Calculate the measures for different possible horizontal groups."},{"Add":"This is the regular one where the LAST element is the only one "},{"Add":"allowed to be non-zero height"},{"Add":""},{"Add":"From "},{"Add":"["},{"Add":" [a1, a2, a3],"},{"Add":" [b1, b2, b3],"},{"Add":" [c1, c2, c3]"},{"Add":"]"},{"Add":""},{"Add":"[(a1, b1, c1), (a1, b1, c2), .., (a3, b3, c3)]"},{"Add":"-/"},{"Add":"def measureH"},{"Add":" (grps : Array (Nat × (Array Measure))) "},{"Add":" (width : Nat) "},{"Add":" (sep : Measure) "},{"Add":" : Array Measure := "},{"Add":"match grps.back? with"},{"Add":"| none => #[]"},{"Add":"| some ⟨_, hd⟩ => "},{"Add":" match zeroHeights (grps.toSubarray 0 (grps.size - 1)) with"},{"Add":" | none => #[]"},{"Add":" | some rest => "},{"Add":" let concat_sep := fun (s1 s2 : Measure) => (s1.concat sep).concat s2"},{"Add":" let inner := rest.foldr (fun next sink => pareto width $ flatCartesian concat_sep next sink) hd"},{"Add":" inner.map (fun measure => measure.cons (Choice.H measure.lastWidth))"},{"Add":""},{"Add":""},{"Add":"-- The irregular one for text."},{"Add":"-- The FIRST element is the only one allowed to be non-zero height"},{"Add":"def measureT"},{"Add":" (grps : Array (Nat × (Array Measure))) "},{"Add":" (width : Nat) "},{"Add":" (sep : Measure) "},{"Add":" : Array Measure := "},{"Add":"match grps.get? 0 with"},{"Add":"| none => #[]"},{"Add":"| some ⟨_, hd⟩ => "},{"Add":" match zeroHeights (grps.toSubarray 1 (grps.size)) with"},{"Add":" | none => #[]"},{"Add":" | some rest => "},{"Add":" let concat_sep := fun m1 m2 => (m1.concat sep).concat m2"},{"Add":" let inner := rest.foldl (fun sink next => pareto width $ flatCartesian concat_sep sink next) hd"},{"Add":" inner.map (fun measure => measure.cons (Choice.T))"},{"Add":""},{"Add":" "},{"Add":"/-"},{"Add":"Calculate the measures for different possible vertical groups."},{"Add":""},{"Add":"From "},{"Add":"["},{"Add":" [a1, a2, a3],"},{"Add":" [b1, b2, b3],"},{"Add":" [c1, c2, c3]"},{"Add":"]"},{"Add":""},{"Add":"[(a1, b1, c1), (a1, b1, c2), .., (a3, b3, c3)]"},{"Add":"-/"},{"Add":"def measureV"},{"Add":" (grps : Array (Nat × (Array Measure))) "},{"Add":" (width : Nat) "},{"Add":" : Array Measure := "},{"Add":"-- for each x in [x1, x2, .. xn], indent it by the proper amount by concatenating"},{"Add":"-- some chunk on the left hand side."},{"Add":"let indented := grps.map (fun ⟨amt, grp⟩ => grp.map (fun x => (Measure.mk 0 amt 0 DList.empty).concat x))"},{"Add":"match indented.get? 0 with"},{"Add":"| none => #[]"},{"Add":"| some hd => "},{"Add":" let rest := indented.toSubarray 1 (grps.size)"},{"Add":" let concat_nl := fun (s1 s2 : Measure) => s1.vConcat s2"},{"Add":" let inner := rest.foldl (fun sink next => pareto width $ flatCartesian concat_nl sink next) hd"},{"Add":" inner.map (fun measure => measure.cons (Choice.V measure.lastWidth))"},{"Add":""}]}},{"FileAdd":{"meta":{"basename":"Doc.lean","metadata":0},"context":[{"change":0,"pos":7585}],"contents":[{"Add":"import Std.Data.DList"},{"Add":"import Printiest.Util"},{"Add":"import Printiest.Measure"},{"Add":""},{"Add":"open Std (DList)"},{"Add":"open Spaces Side"},{"Add":""},{"Add":"/-"},{"Add":"GroupKind controls how Groups are rendered. Generally the choice is going to be whether"},{"Add":"you're formatting code or formatting text. If you don't want to choose, you don't have to,"},{"Add":"but this will have some impact performance since we potentially have 3 branches instead of 2 at every"},{"Add":"`Group`. Most of the time, one of the choices will dominate the other (have strictly more attractive"},{"Add":"dimensions) meaning the alternative won't be considered, but there will be outliers."},{"Add":""},{"Add":"The main issue is that the horizontal layout scheme originally implemented in `Prettiest` doesn't"},{"Add":"lay out blocks of human-language text well, because it wants all the leading elements to be "},{"Add":"non-zero height, and allows the LAST one to be non-zero, then does a fold right, so we can have "},{"Add":"things that hang/indent nicely, like:"},{"Add":"```"},{"Add":"a b c d e f"},{"Add":" g h i"},{"Add":" j k l m n o"},{"Add":" p q r s t u"},{"Add":"```"},{"Add":""},{"Add":"But for text, we want to have a block, for which the FIRST element can be non-zero height, but"},{"Add":"the rest need to be zero-height, and we want to fold LEFT, so we get things like:"},{"Add":"```"},{"Add":"Lorem ipsum dolor sit amet, consectetur"},{"Add":"adipiscing elit, sed do eiusmod tempor"},{"Add":"incididunt ut labore et dolore magna"},{"Add":"aliqua. Ut enim ad minim veniam, quis"},{"Add":"nostrud exercitation ullamco laboris"},{"Add":"nisi ut aliquip ex ea commodo consequat."},{"Add":"```"},{"Add":""},{"Add":"Here, if we began with a \"first\" element of "},{"Add":"```"},{"Add":"Lorem ipsum dolor sit amet, consectetur"},{"Add":"adipiscing elit, "},{"Add":"```"},{"Add":"and a second element of `sed`, we want 'sed' to be \"tetris'd\" into the"},{"Add":"rest of the block if we began by wanting the whole thing to be grouped."},{"Add":"For that to happen, we have to allow non-zero height elements on the LHS."},{"Add":""},{"Add":"G(G(G(G(\"\", Lorem), ipsum) dolor) sit)..."},{"Add":""},{"Add":"We allow the first element to be non-zero so we can nicely tetris together blocks of text"},{"Add":"without forcing them to be new paragraphs."},{"Add":""},{"Add":"GroupKind is supposed to be a bitfield"},{"Add":"1 |-> HorizontalCode"},{"Add":"2 |-> HorizontalText"},{"Add":"4 |-> Vertical"},{"Add":""},{"Add":"normal is horizontalCode + Vertical"},{"Add":"text is horizontalText + Vertical"},{"Add":"-/"},{"Add":"abbrev GroupKind := UInt8"},{"Add":"def GroupKind.horizontalCode : GroupKind := 1"},{"Add":"def GroupKind.horizontalText : GroupKind := 2"},{"Add":"def GroupKind.vertical : GroupKind := 4"},{"Add":"def GroupKind.normal : GroupKind := GroupKind.horizontalCode.lor GroupKind.vertical"},{"Add":"def GroupKind.text : GroupKind := GroupKind.horizontalText.lor GroupKind.vertical"},{"Add":"def GroupKind.all : GroupKind := (GroupKind.horizontalText.lor GroupKind.vertical).lor GroupKind.horizontalCode"},{"Add":""},{"Add":"inductive Doc"},{"Add":"| Nil : Doc"},{"Add":"| Text (s: String) : Doc"},{"Add":"| Concat (l: Doc) (r: Doc) : Doc"},{"Add":"| Flush (d: Doc) : Doc"},{"Add":"| Group (ds: Array (Nat × Doc)) (sep: String) (kind: GroupKind) : Doc"},{"Add":""},{"Add":"instance : Inhabited Doc := ⟨Doc.Nil⟩"},{"Add":"instance : Coe String Doc := ⟨Doc.Text⟩ "},{"Add":""},{"Add":"def Doc.vConcat (l r : Doc) : Doc := Doc.Concat (Flush l) r"},{"Add":""},{"Add":"infixl:65 \" <> \" => Doc.Concat"},{"Add":"-- Concatenate d1 and d2, putting a single space between them."},{"Add":"infixl:65 \" <+> \" => fun d1 d2 => d1 <> Doc.Text \" \" <> d2"},{"Add":"/- "},{"Add":"Concatenate d1 and d2 vertically:"},{"Add":"d1"},{"Add":"d2"},{"Add":"-/"},{"Add":"infixl:65 \" \" => fun d1 d2 => Doc.vConcat d1 d2"},{"Add":""},{"Add":"/-"},{"Add":"The default group style is `normal`. Generally if you're grouping a block of text"},{"Add":"you want to use groupText to make it look nice, which is different enough that "},{"Add":"it has a slightly different name."},{"Add":""},{"Add":"You can limit it to `horizontal` or `vertical` if you KNOW you want to restrict"},{"Add":"the rendering to a certain look, or if you're concerned about performance for "},{"Add":"either extremely large or degenerate Docs."},{"Add":"-/"},{"Add":"def Doc.group "},{"Add":" (docs : Array Doc) "},{"Add":" (sep : String) "},{"Add":" (kind : GroupKind := GroupKind.normal) : Doc := "},{"Add":" Group (docs.map $ fun x => (0, x)) sep kind"},{"Add":""},{"Add":"def Doc.groupIndent "},{"Add":" (docs : Array (Nat × Doc)) "},{"Add":" (sep : String) "},{"Add":" (kind : GroupKind := GroupKind.normal) : Doc := "},{"Add":" Group docs sep kind"},{"Add":""},{"Add":"/-"},{"Add":"For creating blocks of text."},{"Add":"-/"},{"Add":"def Doc.groupText (l: List String) : Doc :="},{"Add":" match l with"},{"Add":" | [] => Doc.Nil"},{"Add":" | hd :: tl => "},{"Add":" let base := Doc.Text hd"},{"Add":" tl.foldl (fun sink next => Doc.Group #[(0, sink), (0, Doc.Text next)] \" \" GroupKind.text) base"},{"Add":""},{"Add":"/--"},{"Add":"For creating blocks of text split on a character identified by `p`."},{"Add":"-/"},{"Add":"def Doc.groupTextFromString (s : String) : Doc := Doc.groupText $ s.split (fun c => c = ' ')"},{"Add":""},{"Add":"def blank (n : Nat): String :="},{"Add":" let rec aux (n : Nat) (acc : String) : String :="},{"Add":" match n with"},{"Add":" | 0 => acc"},{"Add":" | (n+1) => aux n (acc ++ \" \")"},{"Add":" aux n \"\""},{"Add":""},{"Add":"def Doc.alwaysHang (indent : Nat) (upper : Doc) (lower : Doc) : Doc := "},{"Add":" let rhs := Doc.Concat (Doc.Text $ blank indent) lower"},{"Add":" Concat (Flush upper) rhs"},{"Add":""},{"Add":"/-"},{"Add":"Given `self` and `ys`, this will print bothon the same line"},{"Add":"iff they fit, otherwise it will print `xs`, then hang `ys`."},{"Add":"WARNING: This will probably not look good if the RHS is a group."},{"Add":"```text"},{"Add":" EITHER"},{"Add":" self ys1 ys2"},{"Add":" OR"},{"Add":" self"},{"Add":" ys1"},{"Add":" ys2"},{"Add":"```"},{"Add":"-/"},{"Add":"def Doc.hang (indent : Nat) (upper : Doc) (lower : Doc) (sep : String := \" \") : Doc := "},{"Add":" Doc.groupIndent #[(0, upper), (indent, lower)] sep"},{"Add":""},{"Add":"/-"},{"Add":"Make IE"},{"Add":"```"},{"Add":"["},{"Add":" x,"},{"Add":" y,"},{"Add":" z"},{"Add":"]"},{"Add":"```"},{"Add":"-/"},{"Add":"def Doc.encloseSep (l : Doc) (docs: Array Doc) (sep: String) (r : Doc) (indent : Nat) : Doc :="},{"Add":" match docs.get? docs.size.pred with"},{"Add":" | none => Doc.Concat l r"},{"Add":" | some last => "},{"Add":" let sub := (docs.toSubarray 0 docs.size.pred).toArray"},{"Add":" let middle := sub.map (fun d => Doc.Concat d sep)"},{"Add":" let inner := Doc.group (middle.push last) \"\""},{"Add":" Doc.groupIndent #[(0, l), (indent, inner), (0, r)] \"\""},{"Add":""},{"Add":"/-"},{"Add":"Calcualte the sizes/shapes of different possible outcomes."},{"Add":""},{"Add":"Ideally this would measure strings based on unicode graphemes instead"},{"Add":"of length, but for now we're working with what we have."},{"Add":"-/"},{"Add":"partial def Doc.measure (w : Nat) : Doc -> Array Measure"},{"Add":"| Nil => #[Inhabited.default]"},{"Add":"| Text t => #[Measure.text t]"},{"Add":"| Concat l r => "},{"Add":" let ls := l.measure w"},{"Add":" let rs := r.measure w"},{"Add":" pareto w $ flatCartesian Measure.concat ls rs"},{"Add":""},{"Add":"| Flush d => pareto w $ (d.measure w).map Measure.flush"},{"Add":"| Group ds sep kind => "},{"Add":" let inner := ds.map (fun (indent, d) => (indent, d.measure w))"},{"Add":" let sep := Measure.text sep"},{"Add":" let horizontal := if kind.land GroupKind.horizontalCode != 0 then measureH inner w sep else #[]"},{"Add":" let text := if kind.land GroupKind.horizontalText != 0 then measureT inner w sep else #[]"},{"Add":" let vertical := if kind.land GroupKind.vertical != 0 then measureV inner w else #[]"},{"Add":" pareto w $ horizontal ++ text ++ vertical"},{"Add":""},{"Add":"partial def Doc.renderAux"},{"Add":" {m : Type -> Type} "},{"Add":" [inst1: Monad m] "},{"Add":" [Inhabited (m (RenderState σ))] "},{"Add":" [HasWrite σ m]"},{"Add":" (w : Nat) "},{"Add":" : Doc -> StateT (RenderState σ) m Unit"},{"Add":"| Nil => return"},{"Add":"| Text txt => do"},{"Add":" let blank := match (<- get).spaces with"},{"Add":" | Hot n => blank n"},{"Add":" | _ => \"\""},{"Add":" HasWrite.tell blank"},{"Add":" HasWrite.tell txt"},{"Add":" modify $ fun s' => { s' with spaces := Cold (txt.length + s'.spaces.toNat)}"},{"Add":" "},{"Add":"| Concat l r => do"},{"Add":" fun s => l.renderAux w { s with side := Left }"},{"Add":" fun s => r.renderAux w { s with side := Right }"},{"Add":" modify $ fun s => { s with spaces := s.spaces.toCold }"},{"Add":""},{"Add":"| Flush d => do"},{"Add":" let s0 <- get"},{"Add":" d.renderAux w"},{"Add":" HasWrite.tell \"\\n\""},{"Add":" match s0.side with"},{"Add":" | Left => modify $ fun s' => { s' with spaces := s0.spaces.toHot }"},{"Add":" | Right => modify fun s' => { s' with spaces := Hot 0 }"},{"Add":""},{"Add":"| Group ds sep kind => do"},{"Add":" let s0 <- get"},{"Add":" let mut diffs_total := 0"},{"Add":" let mut iterations : Nat := 0"},{"Add":""},{"Add":" let last <- modifyGet $ fun s => "},{"Add":" match s.choices with"},{"Add":" | [] => (Choice.V 0, s0)"},{"Add":" | hd :: tl => (hd, { s with choices := tl })"},{"Add":""},{"Add":" match last with"},{"Add":" | Choice.H lw =>"},{"Add":" for (_, d) in ds do"},{"Add":" let ind_num := if iterations + 1 = ds.size then s0.spaces.toNat + diffs_total else s0.spaces.toNat"},{"Add":" let ind := if (<- get).spaces.isHot then Hot ind_num else Cold ind_num"},{"Add":" fun s => d.renderAux w { s with side := s0.side, spaces := ind }"},{"Add":" if iterations + 1 != ds.size then "},{"Add":" diffs_total := (diffs_total + sep.length + (<- get).spaces.toNat) - ind.toNat"},{"Add":" HasWrite.tell sep"},{"Add":" iterations := iterations + 1"},{"Add":" modify $ fun s => { s with spaces := Cold (lw + s0.spaces.toNat) }"},{"Add":""},{"Add":" | Choice.V lw => "},{"Add":" for (local_ind, d) in ds do"},{"Add":" let ind_num := s0.spaces.toNat + local_ind"},{"Add":" let ind := if iterations = 0 && (<- get).spaces.isCold then Cold ind_num else Hot ind_num"},{"Add":" fun s => d.renderAux w { s with side := s0.side, spaces := ind }"},{"Add":" if iterations + 1 != ds.size then HasWrite.tell \"\\n\""},{"Add":" iterations := iterations + 1"},{"Add":" modify $ fun s => { s with spaces := Cold (lw + s0.spaces.toNat) }"},{"Add":""},{"Add":" | Choice.T =>"},{"Add":" for (_, d) in ds do"},{"Add":" let ind_num := s0.spaces.toNat"},{"Add":" let ind := if iterations = 0 && (<- get).spaces.isHot then Hot ind_num else Cold ind_num"},{"Add":" fun s => d.renderAux w { s with side := s0.side, spaces := ind }"},{"Add":" if iterations + 1 != ds.size then HasWrite.tell sep"},{"Add":" iterations := iterations + 1"},{"Add":" modify $ fun state => { state with spaces := s0.spaces.toCold }"},{"Add":""},{"Add":"/-"},{"Add":"Render a Doc with the given width directly to a stream."},{"Add":"I'm not sure how Lean handles writing to a stream internally; I know in Rust there are"},{"Add":"performance issues without buffered writers"},{"Add":"-/"},{"Add":"def Doc.renderStream (doc : Doc) (width: Nat) (stream: IO.FS.Stream) : IO Unit := do "},{"Add":"let sils := doc.measure width"},{"Add":"let hd := sils.get! 0"},{"Add":"let choices := hd.choices.toList"},{"Add":"let _ <- doc.renderAux width (RenderState.new stream choices)"},{"Add":""},{"Add":"/-"},{"Add":"Render a Doc with the given width into a string accumulator."},{"Add":"-/"},{"Add":"def Doc.renderString (doc : Doc) (width: Nat) : String := do "},{"Add":"let sils := doc.measure width"},{"Add":"let hd := sils.get! 0"},{"Add":"let choices := hd.choices.toList"},{"Add":"let (_, rs) <- doc.renderAux width (RenderState.new \"\" choices)"},{"Add":"rs.sink"}]}},{"FileAdd":{"meta":{"basename":"LICENSE-GPLv3","metadata":0},"context":[{"change":1,"pos":0}],"contents":[{"Add":" GNU GENERAL PUBLIC LICENSE"},{"Add":" Version 3, 29 June 2007"},{"Add":""},{"Add":" Copyright (C) 2007 Free Software Foundation, Inc. "},{"Add":" Everyone is permitted to copy and distribute verbatim copies"},{"Add":" of this license document, but changing it is not allowed."},{"Add":""},{"Add":" Preamble"},{"Add":""},{"Add":" The GNU General Public License is a free, copyleft license for"},{"Add":"software and other kinds of works."},{"Add":""},{"Add":" The licenses for most software and other practical works are designed"},{"Add":"to take away your freedom to share and change the works. By contrast,"},{"Add":"the GNU General Public License is intended to guarantee your freedom to"},{"Add":"share and change all versions of a program--to make sure it remains free"},{"Add":"software for all its users. We, the Free Software Foundation, use the"},{"Add":"GNU General Public License for most of our software; it applies also to"},{"Add":"any other work released this way by its authors. You can apply it to"},{"Add":"your programs, too."},{"Add":""},{"Add":" When we speak of free software, we are referring to freedom, not"},{"Add":"price. Our General Public Licenses are designed to make sure that you"},{"Add":"have the freedom to distribute copies of free software (and charge for"},{"Add":"them if you wish), that you receive source code or can get it if you"},{"Add":"want it, that you can change the software or use pieces of it in new"},{"Add":"free programs, and that you know you can do these things."},{"Add":""},{"Add":" To protect your rights, we need to prevent others from denying you"},{"Add":"these rights or asking you to surrender the rights. Therefore, you have"},{"Add":"certain responsibilities if you distribute copies of the software, or if"},{"Add":"you modify it: responsibilities to respect the freedom of others."},{"Add":""},{"Add":" For example, if you distribute copies of such a program, whether"},{"Add":"gratis or for a fee, you must pass on to the recipients the same"},{"Add":"freedoms that you received. You must make sure that they, too, receive"},{"Add":"or can get the source code. And you must show them these terms so they"},{"Add":"know their rights."},{"Add":""},{"Add":" Developers that use the GNU GPL protect your rights with two steps:"},{"Add":"(1) assert copyright on the software, and (2) offer you this License"},{"Add":"giving you legal permission to copy, distribute and/or modify it."},{"Add":""},{"Add":" For the developers' and authors' protection, the GPL clearly explains"},{"Add":"that there is no warranty for this free software. For both users' and"},{"Add":"authors' sake, the GPL requires that modified versions be marked as"},{"Add":"changed, so that their problems will not be attributed erroneously to"},{"Add":"authors of previous versions."},{"Add":""},{"Add":" Some devices are designed to deny users access to install or run"},{"Add":"modified versions of the software inside them, although the manufacturer"},{"Add":"can do so. This is fundamentally incompatible with the aim of"},{"Add":"protecting users' freedom to change the software. The systematic"},{"Add":"pattern of such abuse occurs in the area of products for individuals to"},{"Add":"use, which is precisely where it is most unacceptable. Therefore, we"},{"Add":"have designed this version of the GPL to prohibit the practice for those"},{"Add":"products. If such problems arise substantially in other domains, we"},{"Add":"stand ready to extend this provision to those domains in future versions"},{"Add":"of the GPL, as needed to protect the freedom of users."},{"Add":""},{"Add":" Finally, every program is threatened constantly by software patents."},{"Add":"States should not allow patents to restrict development and use of"},{"Add":"software on general-purpose computers, but in those that do, we wish to"},{"Add":"avoid the special danger that patents applied to a free program could"},{"Add":"make it effectively proprietary. To prevent this, the GPL assures that"},{"Add":"patents cannot be used to render the program non-free."},{"Add":""},{"Add":" The precise terms and conditions for copying, distribution and"},{"Add":"modification follow."},{"Add":""},{"Add":" TERMS AND CONDITIONS"},{"Add":""},{"Add":" 0. Definitions."},{"Add":""},{"Add":" \"This License\" refers to version 3 of the GNU General Public License."},{"Add":""},{"Add":" \"Copyright\" also means copyright-like laws that apply to other kinds of"},{"Add":"works, such as semiconductor masks."},{"Add":""},{"Add":" \"The Program\" refers to any copyrightable work licensed under this"},{"Add":"License. Each licensee is addressed as \"you\". \"Licensees\" and"},{"Add":"\"recipients\" may be individuals or organizations."},{"Add":""},{"Add":" To \"modify\" a work means to copy from or adapt all or part of the work"},{"Add":"in a fashion requiring copyright permission, other than the making of an"},{"Add":"exact copy. The resulting work is called a \"modified version\" of the"},{"Add":"earlier work or a work \"based on\" the earlier work."},{"Add":""},{"Add":" A \"covered work\" means either the unmodified Program or a work based"},{"Add":"on the Program."},{"Add":""},{"Add":" To \"propagate\" a work means to do anything with it that, without"},{"Add":"permission, would make you directly or secondarily liable for"},{"Add":"infringement under applicable copyright law, except executing it on a"},{"Add":"computer or modifying a private copy. Propagation includes copying,"},{"Add":"distribution (with or without modification), making available to the"},{"Add":"public, and in some countries other activities as well."},{"Add":""},{"Add":" To \"convey\" a work means any kind of propagation that enables other"},{"Add":"parties to make or receive copies. Mere interaction with a user through"},{"Add":"a computer network, with no transfer of a copy, is not conveying."},{"Add":""},{"Add":" An interactive user interface displays \"Appropriate Legal Notices\""},{"Add":"to the extent that it includes a convenient and prominently visible"},{"Add":"feature that (1) displays an appropriate copyright notice, and (2)"},{"Add":"tells the user that there is no warranty for the work (except to the"},{"Add":"extent that warranties are provided), that licensees may convey the"},{"Add":"work under this License, and how to view a copy of this License. If"},{"Add":"the interface presents a list of user commands or options, such as a"},{"Add":"menu, a prominent item in the list meets this criterion."},{"Add":""},{"Add":" 1. Source Code."},{"Add":""},{"Add":" The \"source code\" for a work means the preferred form of the work"},{"Add":"for making modifications to it. \"Object code\" means any non-source"},{"Add":"form of a work."},{"Add":""},{"Add":" A \"Standard Interface\" means an interface that either is an official"},{"Add":"standard defined by a recognized standards body, or, in the case of"},{"Add":"interfaces specified for a particular programming language, one that"},{"Add":"is widely used among developers working in that language."},{"Add":""},{"Add":" The \"System Libraries\" of an executable work include anything, other"},{"Add":"than the work as a whole, that (a) is included in the normal form of"},{"Add":"packaging a Major Component, but which is not part of that Major"},{"Add":"Component, and (b) serves only to enable use of the work with that"},{"Add":"Major Component, or to implement a Standard Interface for which an"},{"Add":"implementation is available to the public in source code form. A"},{"Add":"\"Major Component\", in this context, means a major essential component"},{"Add":"(kernel, window system, and so on) of the specific operating system"},{"Add":"(if any) on which the executable work runs, or a compiler used to"},{"Add":"produce the work, or an object code interpreter used to run it."},{"Add":""},{"Add":" The \"Corresponding Source\" for a work in object code form means all"},{"Add":"the source code needed to generate, install, and (for an executable"},{"Add":"work) run the object code and to modify the work, including scripts to"},{"Add":"control those activities. However, it does not include the work's"},{"Add":"System Libraries, or general-purpose tools or generally available free"},{"Add":"programs which are used unmodified in performing those activities but"},{"Add":"which are not part of the work. For example, Corresponding Source"},{"Add":"includes interface definition files associated with source files for"},{"Add":"the work, and the source code for shared libraries and dynamically"},{"Add":"linked subprograms that the work is specifically designed to require,"},{"Add":"such as by intimate data communication or control flow between those"},{"Add":"subprograms and other parts of the work."},{"Add":""},{"Add":" The Corresponding Source need not include anything that users"},{"Add":"can regenerate automatically from other parts of the Corresponding"},{"Add":"Source."},{"Add":""},{"Add":" The Corresponding Source for a work in source code form is that"},{"Add":"same work."},{"Add":""},{"Add":" 2. Basic Permissions."},{"Add":""},{"Add":" All rights granted under this License are granted for the term of"},{"Add":"copyright on the Program, and are irrevocable provided the stated"},{"Add":"conditions are met. This License explicitly affirms your unlimited"},{"Add":"permission to run the unmodified Program. The output from running a"},{"Add":"covered work is covered by this License only if the output, given its"},{"Add":"content, constitutes a covered work. This License acknowledges your"},{"Add":"rights of fair use or other equivalent, as provided by copyright law."},{"Add":""},{"Add":" You may make, run and propagate covered works that you do not"},{"Add":"convey, without conditions so long as your license otherwise remains"},{"Add":"in force. You may convey covered works to others for the sole purpose"},{"Add":"of having them make modifications exclusively for you, or provide you"},{"Add":"with facilities for running those works, provided that you comply with"},{"Add":"the terms of this License in conveying all material for which you do"},{"Add":"not control copyright. Those thus making or running the covered works"},{"Add":"for you must do so exclusively on your behalf, under your direction"},{"Add":"and control, on terms that prohibit them from making any copies of"},{"Add":"your copyrighted material outside their relationship with you."},{"Add":""},{"Add":" Conveying under any other circumstances is permitted solely under"},{"Add":"the conditions stated below. Sublicensing is not allowed; section 10"},{"Add":"makes it unnecessary."},{"Add":""},{"Add":" 3. Protecting Users' Legal Rights From Anti-Circumvention Law."},{"Add":""},{"Add":" No covered work shall be deemed part of an effective technological"},{"Add":"measure under any applicable law fulfilling obligations under article"},{"Add":"11 of the WIPO copyright treaty adopted on 20 December 1996, or"},{"Add":"similar laws prohibiting or restricting circumvention of such"},{"Add":"measures."},{"Add":""},{"Add":" When you convey a covered work, you waive any legal power to forbid"},{"Add":"circumvention of technological measures to the extent such circumvention"},{"Add":"is effected by exercising rights under this License with respect to"},{"Add":"the covered work, and you disclaim any intention to limit operation or"},{"Add":"modification of the work as a means of enforcing, against the work's"},{"Add":"users, your or third parties' legal rights to forbid circumvention of"},{"Add":"technological measures."},{"Add":""},{"Add":" 4. Conveying Verbatim Copies."},{"Add":""},{"Add":" You may convey verbatim copies of the Program's source code as you"},{"Add":"receive it, in any medium, provided that you conspicuously and"},{"Add":"appropriately publish on each copy an appropriate copyright notice;"},{"Add":"keep intact all notices stating that this License and any"},{"Add":"non-permissive terms added in accord with section 7 apply to the code;"},{"Add":"keep intact all notices of the absence of any warranty; and give all"},{"Add":"recipients a copy of this License along with the Program."},{"Add":""},{"Add":" You may charge any price or no price for each copy that you convey,"},{"Add":"and you may offer support or warranty protection for a fee."},{"Add":""},{"Add":" 5. Conveying Modified Source Versions."},{"Add":""},{"Add":" You may convey a work based on the Program, or the modifications to"},{"Add":"produce it from the Program, in the form of source code under the"},{"Add":"terms of section 4, provided that you also meet all of these conditions:"},{"Add":""},{"Add":" a) The work must carry prominent notices stating that you modified"},{"Add":" it, and giving a relevant date."},{"Add":""},{"Add":" b) The work must carry prominent notices stating that it is"},{"Add":" released under this License and any conditions added under section"},{"Add":" 7. This requirement modifies the requirement in section 4 to"},{"Add":" \"keep intact all notices\"."},{"Add":""},{"Add":" c) You must license the entire work, as a whole, under this"},{"Add":" License to anyone who comes into possession of a copy. This"},{"Add":" License will therefore apply, along with any applicable section 7"},{"Add":" additional terms, to the whole of the work, and all its parts,"},{"Add":" regardless of how they are packaged. This License gives no"},{"Add":" permission to license the work in any other way, but it does not"},{"Add":" invalidate such permission if you have separately received it."},{"Add":""},{"Add":" d) If the work has interactive user interfaces, each must display"},{"Add":" Appropriate Legal Notices; however, if the Program has interactive"},{"Add":" interfaces that do not display Appropriate Legal Notices, your"},{"Add":" work need not make them do so."},{"Add":""},{"Add":" A compilation of a covered work with other separate and independent"},{"Add":"works, which are not by their nature extensions of the covered work,"},{"Add":"and which are not combined with it such as to form a larger program,"},{"Add":"in or on a volume of a storage or distribution medium, is called an"},{"Add":"\"aggregate\" if the compilation and its resulting copyright are not"},{"Add":"used to limit the access or legal rights of the compilation's users"},{"Add":"beyond what the individual works permit. Inclusion of a covered work"},{"Add":"in an aggregate does not cause this License to apply to the other"},{"Add":"parts of the aggregate."},{"Add":""},{"Add":" 6. Conveying Non-Source Forms."},{"Add":""},{"Add":" You may convey a covered work in object code form under the terms"},{"Add":"of sections 4 and 5, provided that you also convey the"},{"Add":"machine-readable Corresponding Source under the terms of this License,"},{"Add":"in one of these ways:"},{"Add":""},{"Add":" a) Convey the object code in, or embodied in, a physical product"},{"Add":" (including a physical distribution medium), accompanied by the"},{"Add":" Corresponding Source fixed on a durable physical medium"},{"Add":" customarily used for software interchange."},{"Add":""},{"Add":" b) Convey the object code in, or embodied in, a physical product"},{"Add":" (including a physical distribution medium), accompanied by a"},{"Add":" written offer, valid for at least three years and valid for as"},{"Add":" long as you offer spare parts or customer support for that product"},{"Add":" model, to give anyone who possesses the object code either (1) a"},{"Add":" copy of the Corresponding Source for all the software in the"},{"Add":" product that is covered by this License, on a durable physical"},{"Add":" medium customarily used for software interchange, for a price no"},{"Add":" more than your reasonable cost of physically performing this"},{"Add":" conveying of source, or (2) access to copy the"},{"Add":" Corresponding Source from a network server at no charge."},{"Add":""},{"Add":" c) Convey individual copies of the object code with a copy of the"},{"Add":" written offer to provide the Corresponding Source. This"},{"Add":" alternative is allowed only occasionally and noncommercially, and"},{"Add":" only if you received the object code with such an offer, in accord"},{"Add":" with subsection 6b."},{"Add":""},{"Add":" d) Convey the object code by offering access from a designated"},{"Add":" place (gratis or for a charge), and offer equivalent access to the"},{"Add":" Corresponding Source in the same way through the same place at no"},{"Add":" further charge. You need not require recipients to copy the"},{"Add":" Corresponding Source along with the object code. If the place to"},{"Add":" copy the object code is a network server, the Corresponding Source"},{"Add":" may be on a different server (operated by you or a third party)"},{"Add":" that supports equivalent copying facilities, provided you maintain"},{"Add":" clear directions next to the object code saying where to find the"},{"Add":" Corresponding Source. Regardless of what server hosts the"},{"Add":" Corresponding Source, you remain obligated to ensure that it is"},{"Add":" available for as long as needed to satisfy these requirements."},{"Add":""},{"Add":" e) Convey the object code using peer-to-peer transmission, provided"},{"Add":" you inform other peers where the object code and Corresponding"},{"Add":" Source of the work are being offered to the general public at no"},{"Add":" charge under subsection 6d."},{"Add":""},{"Add":" A separable portion of the object code, whose source code is excluded"},{"Add":"from the Corresponding Source as a System Library, need not be"},{"Add":"included in conveying the object code work."},{"Add":""},{"Add":" A \"User Product\" is either (1) a \"consumer product\", which means any"},{"Add":"tangible personal property which is normally used for personal, family,"},{"Add":"or household purposes, or (2) anything designed or sold for incorporation"},{"Add":"into a dwelling. In determining whether a product is a consumer product,"},{"Add":"doubtful cases shall be resolved in favor of coverage. For a particular"},{"Add":"product received by a particular user, \"normally used\" refers to a"},{"Add":"typical or common use of that class of product, regardless of the status"},{"Add":"of the particular user or of the way in which the particular user"},{"Add":"actually uses, or expects or is expected to use, the product. A product"},{"Add":"is a consumer product regardless of whether the product has substantial"},{"Add":"commercial, industrial or non-consumer uses, unless such uses represent"},{"Add":"the only significant mode of use of the product."},{"Add":""},{"Add":" \"Installation Information\" for a User Product means any methods,"},{"Add":"procedures, authorization keys, or other information required to install"},{"Add":"and execute modified versions of a covered work in that User Product from"},{"Add":"a modified version of its Corresponding Source. The information must"},{"Add":"suffice to ensure that the continued functioning of the modified object"},{"Add":"code is in no case prevented or interfered with solely because"},{"Add":"modification has been made."},{"Add":""},{"Add":" If you convey an object code work under this section in, or with, or"},{"Add":"specifically for use in, a User Product, and the conveying occurs as"},{"Add":"part of a transaction in which the right of possession and use of the"},{"Add":"User Product is transferred to the recipient in perpetuity or for a"},{"Add":"fixed term (regardless of how the transaction is characterized), the"},{"Add":"Corresponding Source conveyed under this section must be accompanied"},{"Add":"by the Installation Information. But this requirement does not apply"},{"Add":"if neither you nor any third party retains the ability to install"},{"Add":"modified object code on the User Product (for example, the work has"},{"Add":"been installed in ROM)."},{"Add":""},{"Add":" The requirement to provide Installation Information does not include a"},{"Add":"requirement to continue to provide support service, warranty, or updates"},{"Add":"for a work that has been modified or installed by the recipient, or for"},{"Add":"the User Product in which it has been modified or installed. Access to a"},{"Add":"network may be denied when the modification itself materially and"},{"Add":"adversely affects the operation of the network or violates the rules and"},{"Add":"protocols for communication across the network."},{"Add":""},{"Add":" Corresponding Source conveyed, and Installation Information provided,"},{"Add":"in accord with this section must be in a format that is publicly"},{"Add":"documented (and with an implementation available to the public in"},{"Add":"source code form), and must require no special password or key for"},{"Add":"unpacking, reading or copying."},{"Add":""},{"Add":" 7. Additional Terms."},{"Add":""},{"Add":" \"Additional permissions\" are terms that supplement the terms of this"},{"Add":"License by making exceptions from one or more of its conditions."},{"Add":"Additional permissions that are applicable to the entire Program shall"},{"Add":"be treated as though they were included in this License, to the extent"},{"Add":"that they are valid under applicable law. If additional permissions"},{"Add":"apply only to part of the Program, that part may be used separately"},{"Add":"under those permissions, but the entire Program remains governed by"},{"Add":"this License without regard to the additional permissions."},{"Add":""},{"Add":" When you convey a copy of a covered work, you may at your option"},{"Add":"remove any additional permissions from that copy, or from any part of"},{"Add":"it. (Additional permissions may be written to require their own"},{"Add":"removal in certain cases when you modify the work.) You may place"},{"Add":"additional permissions on material, added by you to a covered work,"},{"Add":"for which you have or can give appropriate copyright permission."},{"Add":""},{"Add":" Notwithstanding any other provision of this License, for material you"},{"Add":"add to a covered work, you may (if authorized by the copyright holders of"},{"Add":"that material) supplement the terms of this License with terms:"},{"Add":""},{"Add":" a) Disclaiming warranty or limiting liability differently from the"},{"Add":" terms of sections 15 and 16 of this License; or"},{"Add":""},{"Add":" b) Requiring preservation of specified reasonable legal notices or"},{"Add":" author attributions in that material or in the Appropriate Legal"},{"Add":" Notices displayed by works containing it; or"},{"Add":""},{"Add":" c) Prohibiting misrepresentation of the origin of that material, or"},{"Add":" requiring that modified versions of such material be marked in"},{"Add":" reasonable ways as different from the original version; or"},{"Add":""},{"Add":" d) Limiting the use for publicity purposes of names of licensors or"},{"Add":" authors of the material; or"},{"Add":""},{"Add":" e) Declining to grant rights under trademark law for use of some"},{"Add":" trade names, trademarks, or service marks; or"},{"Add":""},{"Add":" f) Requiring indemnification of licensors and authors of that"},{"Add":" material by anyone who conveys the material (or modified versions of"},{"Add":" it) with contractual assumptions of liability to the recipient, for"},{"Add":" any liability that these contractual assumptions directly impose on"},{"Add":" those licensors and authors."},{"Add":""},{"Add":" All other non-permissive additional terms are considered \"further"},{"Add":"restrictions\" within the meaning of section 10. If the Program as you"},{"Add":"received it, or any part of it, contains a notice stating that it is"},{"Add":"governed by this License along with a term that is a further"},{"Add":"restriction, you may remove that term. If a license document contains"},{"Add":"a further restriction but permits relicensing or conveying under this"},{"Add":"License, you may add to a covered work material governed by the terms"},{"Add":"of that license document, provided that the further restriction does"},{"Add":"not survive such relicensing or conveying."},{"Add":""},{"Add":" If you add terms to a covered work in accord with this section, you"},{"Add":"must place, in the relevant source files, a statement of the"},{"Add":"additional terms that apply to those files, or a notice indicating"},{"Add":"where to find the applicable terms."},{"Add":""},{"Add":" Additional terms, permissive or non-permissive, may be stated in the"},{"Add":"form of a separately written license, or stated as exceptions;"},{"Add":"the above requirements apply either way."},{"Add":""},{"Add":" 8. Termination."},{"Add":""},{"Add":" You may not propagate or modify a covered work except as expressly"},{"Add":"provided under this License. Any attempt otherwise to propagate or"},{"Add":"modify it is void, and will automatically terminate your rights under"},{"Add":"this License (including any patent licenses granted under the third"},{"Add":"paragraph of section 11)."},{"Add":""},{"Add":" However, if you cease all violation of this License, then your"},{"Add":"license from a particular copyright holder is reinstated (a)"},{"Add":"provisionally, unless and until the copyright holder explicitly and"},{"Add":"finally terminates your license, and (b) permanently, if the copyright"},{"Add":"holder fails to notify you of the violation by some reasonable means"},{"Add":"prior to 60 days after the cessation."},{"Add":""},{"Add":" Moreover, your license from a particular copyright holder is"},{"Add":"reinstated permanently if the copyright holder notifies you of the"},{"Add":"violation by some reasonable means, this is the first time you have"},{"Add":"received notice of violation of this License (for any work) from that"},{"Add":"copyright holder, and you cure the violation prior to 30 days after"},{"Add":"your receipt of the notice."},{"Add":""},{"Add":" Termination of your rights under this section does not terminate the"},{"Add":"licenses of parties who have received copies or rights from you under"},{"Add":"this License. If your rights have been terminated and not permanently"},{"Add":"reinstated, you do not qualify to receive new licenses for the same"},{"Add":"material under section 10."},{"Add":""},{"Add":" 9. Acceptance Not Required for Having Copies."},{"Add":""},{"Add":" You are not required to accept this License in order to receive or"},{"Add":"run a copy of the Program. Ancillary propagation of a covered work"},{"Add":"occurring solely as a consequence of using peer-to-peer transmission"},{"Add":"to receive a copy likewise does not require acceptance. However,"},{"Add":"nothing other than this License grants you permission to propagate or"},{"Add":"modify any covered work. These actions infringe copyright if you do"},{"Add":"not accept this License. Therefore, by modifying or propagating a"},{"Add":"covered work, you indicate your acceptance of this License to do so."},{"Add":""},{"Add":" 10. Automatic Licensing of Downstream Recipients."},{"Add":""},{"Add":" Each time you convey a covered work, the recipient automatically"},{"Add":"receives a license from the original licensors, to run, modify and"},{"Add":"propagate that work, subject to this License. You are not responsible"},{"Add":"for enforcing compliance by third parties with this License."},{"Add":""},{"Add":" An \"entity transaction\" is a transaction transferring control of an"},{"Add":"organization, or substantially all assets of one, or subdividing an"},{"Add":"organization, or merging organizations. If propagation of a covered"},{"Add":"work results from an entity transaction, each party to that"},{"Add":"transaction who receives a copy of the work also receives whatever"},{"Add":"licenses to the work the party's predecessor in interest had or could"},{"Add":"give under the previous paragraph, plus a right to possession of the"},{"Add":"Corresponding Source of the work from the predecessor in interest, if"},{"Add":"the predecessor has it or can get it with reasonable efforts."},{"Add":""},{"Add":" You may not impose any further restrictions on the exercise of the"},{"Add":"rights granted or affirmed under this License. For example, you may"},{"Add":"not impose a license fee, royalty, or other charge for exercise of"},{"Add":"rights granted under this License, and you may not initiate litigation"},{"Add":"(including a cross-claim or counterclaim in a lawsuit) alleging that"},{"Add":"any patent claim is infringed by making, using, selling, offering for"},{"Add":"sale, or importing the Program or any portion of it."},{"Add":""},{"Add":" 11. Patents."},{"Add":""},{"Add":" A \"contributor\" is a copyright holder who authorizes use under this"},{"Add":"License of the Program or a work on which the Program is based. The"},{"Add":"work thus licensed is called the contributor's \"contributor version\"."},{"Add":""},{"Add":" A contributor's \"essential patent claims\" are all patent claims"},{"Add":"owned or controlled by the contributor, whether already acquired or"},{"Add":"hereafter acquired, that would be infringed by some manner, permitted"},{"Add":"by this License, of making, using, or selling its contributor version,"},{"Add":"but do not include claims that would be infringed only as a"},{"Add":"consequence of further modification of the contributor version. For"},{"Add":"purposes of this definition, \"control\" includes the right to grant"},{"Add":"patent sublicenses in a manner consistent with the requirements of"},{"Add":"this License."},{"Add":""},{"Add":" Each contributor grants you a non-exclusive, worldwide, royalty-free"},{"Add":"patent license under the contributor's essential patent claims, to"},{"Add":"make, use, sell, offer for sale, import and otherwise run, modify and"},{"Add":"propagate the contents of its contributor version."},{"Add":""},{"Add":" In the following three paragraphs, a \"patent license\" is any express"},{"Add":"agreement or commitment, however denominated, not to enforce a patent"},{"Add":"(such as an express permission to practice a patent or covenant not to"},{"Add":"sue for patent infringement). To \"grant\" such a patent license to a"},{"Add":"party means to make such an agreement or commitment not to enforce a"},{"Add":"patent against the party."},{"Add":""},{"Add":" If you convey a covered work, knowingly relying on a patent license,"},{"Add":"and the Corresponding Source of the work is not available for anyone"},{"Add":"to copy, free of charge and under the terms of this License, through a"},{"Add":"publicly available network server or other readily accessible means,"},{"Add":"then you must either (1) cause the Corresponding Source to be so"},{"Add":"available, or (2) arrange to deprive yourself of the benefit of the"},{"Add":"patent license for this particular work, or (3) arrange, in a manner"},{"Add":"consistent with the requirements of this License, to extend the patent"},{"Add":"license to downstream recipients. \"Knowingly relying\" means you have"},{"Add":"actual knowledge that, but for the patent license, your conveying the"},{"Add":"covered work in a country, or your recipient's use of the covered work"},{"Add":"in a country, would infringe one or more identifiable patents in that"},{"Add":"country that you have reason to believe are valid."},{"Add":""},{"Add":" If, pursuant to or in connection with a single transaction or"},{"Add":"arrangement, you convey, or propagate by procuring conveyance of, a"},{"Add":"covered work, and grant a patent license to some of the parties"},{"Add":"receiving the covered work authorizing them to use, propagate, modify"},{"Add":"or convey a specific copy of the covered work, then the patent license"},{"Add":"you grant is automatically extended to all recipients of the covered"},{"Add":"work and works based on it."},{"Add":""},{"Add":" A patent license is \"discriminatory\" if it does not include within"},{"Add":"the scope of its coverage, prohibits the exercise of, or is"},{"Add":"conditioned on the non-exercise of one or more of the rights that are"},{"Add":"specifically granted under this License. You may not convey a covered"},{"Add":"work if you are a party to an arrangement with a third party that is"},{"Add":"in the business of distributing software, under which you make payment"},{"Add":"to the third party based on the extent of your activity of conveying"},{"Add":"the work, and under which the third party grants, to any of the"},{"Add":"parties who would receive the covered work from you, a discriminatory"},{"Add":"patent license (a) in connection with copies of the covered work"},{"Add":"conveyed by you (or copies made from those copies), or (b) primarily"},{"Add":"for and in connection with specific products or compilations that"},{"Add":"contain the covered work, unless you entered into that arrangement,"},{"Add":"or that patent license was granted, prior to 28 March 2007."},{"Add":""},{"Add":" Nothing in this License shall be construed as excluding or limiting"},{"Add":"any implied license or other defenses to infringement that may"},{"Add":"otherwise be available to you under applicable patent law."},{"Add":""},{"Add":" 12. No Surrender of Others' Freedom."},{"Add":""},{"Add":" If conditions are imposed on you (whether by court order, agreement or"},{"Add":"otherwise) that contradict the conditions of this License, they do not"},{"Add":"excuse you from the conditions of this License. If you cannot convey a"},{"Add":"covered work so as to satisfy simultaneously your obligations under this"},{"Add":"License and any other pertinent obligations, then as a consequence you may"},{"Add":"not convey it at all. For example, if you agree to terms that obligate you"},{"Add":"to collect a royalty for further conveying from those to whom you convey"},{"Add":"the Program, the only way you could satisfy both those terms and this"},{"Add":"License would be to refrain entirely from conveying the Program."},{"Add":""},{"Add":" 13. Use with the GNU Affero General Public License."},{"Add":""},{"Add":" Notwithstanding any other provision of this License, you have"},{"Add":"permission to link or combine any covered work with a work licensed"},{"Add":"under version 3 of the GNU Affero General Public License into a single"},{"Add":"combined work, and to convey the resulting work. The terms of this"},{"Add":"License will continue to apply to the part which is the covered work,"},{"Add":"but the special requirements of the GNU Affero General Public License,"},{"Add":"section 13, concerning interaction through a network will apply to the"},{"Add":"combination as such."},{"Add":""},{"Add":" 14. Revised Versions of this License."},{"Add":""},{"Add":" The Free Software Foundation may publish revised and/or new versions of"},{"Add":"the GNU General Public License from time to time. Such new versions will"},{"Add":"be similar in spirit to the present version, but may differ in detail to"},{"Add":"address new problems or concerns."},{"Add":""},{"Add":" Each version is given a distinguishing version number. If the"},{"Add":"Program specifies that a certain numbered version of the GNU General"},{"Add":"Public License \"or any later version\" applies to it, you have the"},{"Add":"option of following the terms and conditions either of that numbered"},{"Add":"version or of any later version published by the Free Software"},{"Add":"Foundation. If the Program does not specify a version number of the"},{"Add":"GNU General Public License, you may choose any version ever published"},{"Add":"by the Free Software Foundation."},{"Add":""},{"Add":" If the Program specifies that a proxy can decide which future"},{"Add":"versions of the GNU General Public License can be used, that proxy's"},{"Add":"public statement of acceptance of a version permanently authorizes you"},{"Add":"to choose that version for the Program."},{"Add":""},{"Add":" Later license versions may give you additional or different"},{"Add":"permissions. However, no additional obligations are imposed on any"},{"Add":"author or copyright holder as a result of your choosing to follow a"},{"Add":"later version."},{"Add":""},{"Add":" 15. Disclaimer of Warranty."},{"Add":""},{"Add":" THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY"},{"Add":"APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT"},{"Add":"HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM \"AS IS\" WITHOUT WARRANTY"},{"Add":"OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,"},{"Add":"THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR"},{"Add":"PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM"},{"Add":"IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF"},{"Add":"ALL NECESSARY SERVICING, REPAIR OR CORRECTION."},{"Add":""},{"Add":" 16. Limitation of Liability."},{"Add":""},{"Add":" IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING"},{"Add":"WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS"},{"Add":"THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY"},{"Add":"GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE"},{"Add":"USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF"},{"Add":"DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD"},{"Add":"PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),"},{"Add":"EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF"},{"Add":"SUCH DAMAGES."},{"Add":""},{"Add":" 17. Interpretation of Sections 15 and 16."},{"Add":""},{"Add":" If the disclaimer of warranty and limitation of liability provided"},{"Add":"above cannot be given local legal effect according to their terms,"},{"Add":"reviewing courts shall apply local law that most closely approximates"},{"Add":"an absolute waiver of all civil liability in connection with the"},{"Add":"Program, unless a warranty or assumption of liability accompanies a"},{"Add":"copy of the Program in return for a fee."},{"Add":""},{"Add":" END OF TERMS AND CONDITIONS"},{"Add":""},{"Add":" How to Apply These Terms to Your New Programs"},{"Add":""},{"Add":" If you develop a new program, and you want it to be of the greatest"},{"Add":"possible use to the public, the best way to achieve this is to make it"},{"Add":"free software which everyone can redistribute and change under these terms."},{"Add":""},{"Add":" To do so, attach the following notices to the program. It is safest"},{"Add":"to attach them to the start of each source file to most effectively"},{"Add":"state the exclusion of warranty; and each file should have at least"},{"Add":"the \"copyright\" line and a pointer to where the full notice is found."},{"Add":""},{"Add":" "},{"Add":" Copyright (C) "},{"Add":""},{"Add":" This program is free software: you can redistribute it and/or modify"},{"Add":" it under the terms of the GNU General Public License as published by"},{"Add":" the Free Software Foundation, either version 3 of the License, or"},{"Add":" (at your option) any later version."},{"Add":""},{"Add":" This program is distributed in the hope that it will be useful,"},{"Add":" but WITHOUT ANY WARRANTY; without even the implied warranty of"},{"Add":" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 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