| 39 | ) |
| 40 | |
| 41 | const wadlerLeijenSafe = <A>( |
| 42 | self: InternalPipeline.LayoutPipeline<A>, |
| 43 | nestingLevel: number, |
| 44 | currentColumn: number, |
| 45 | fits: Layout.Layout.FittingPredicate<A>, |
| 46 | options: Layout.Layout.Options |
| 47 | ): Effect.Effect<DocStream.DocStream<A>> => { |
| 48 | const best = ( |
| 49 | self: InternalPipeline.LayoutPipeline<A>, |
| 50 | nl: number, |
| 51 | cc: number |
| 52 | ): Effect.Effect<DocStream.DocStream<A>> => |
| 53 | Effect.gen(function*() { |
| 54 | switch (self._tag) { |
| 55 | case "Nil": { |
| 56 | return InternalDocStream.empty |
| 57 | } |
| 58 | case "Cons": { |
| 59 | switch (self.document._tag) { |
| 60 | case "Fail": { |
| 61 | return InternalDocStream.failed |
| 62 | } |
| 63 | case "Empty": { |
| 64 | return yield* best(self.pipeline, nl, cc) |
| 65 | } |
| 66 | case "Char": { |
| 67 | const stream = yield* best(self.pipeline, nl, cc + 1) |
| 68 | return InternalDocStream.char(stream, self.document.char) |
| 69 | } |
| 70 | case "Text": { |
| 71 | const length = self.document.text.length |
| 72 | const stream = yield* best(self.pipeline, nl, cc + length) |
| 73 | return InternalDocStream.text(stream, self.document.text) |
| 74 | } |
| 75 | case "Line": { |
| 76 | const stream = yield* best(self.pipeline, self.indent, self.indent) |
| 77 | // Do not produce indentation if there is no subsequent text on |
| 78 | // the same line (prevents trailing whitespace) |
| 79 | const nextIndent = InternalDocStream.isEmptyStream(stream) || InternalDocStream.isLineStream(stream) |
| 80 | ? 0 |
| 81 | : self.indent |
| 82 | return InternalDocStream.line(stream, nextIndent) |
| 83 | } |
| 84 | case "FlatAlt": { |
| 85 | const next = InternalPipeline.cons(self.indent, self.document.left, self.pipeline) |
| 86 | return yield* best(next, nl, cc) |
| 87 | } |
| 88 | case "Cat": { |
| 89 | const inner = InternalPipeline.cons(self.indent, self.document.right, self.pipeline) |
| 90 | const outer = InternalPipeline.cons(self.indent, self.document.left, inner) |
| 91 | return yield* best(outer, nl, cc) |
| 92 | } |
| 93 | case "Nest": { |
| 94 | const indent = self.indent + self.document.indent |
| 95 | const next = InternalPipeline.cons(indent, self.document.doc, self.pipeline) |
| 96 | return yield* best(next, nl, cc) |
| 97 | } |
| 98 | case "Union": { |