From 32ceec379eb44cfa09e9ac119da1541863047f79 Mon Sep 17 00:00:00 2001
From: Matthew Butterick <mb@mbtype.com>
Date: Sat, 14 Feb 2015 14:23:12 -0800
Subject: [PATCH] wrap-typed in progress

---
 quad/quads-typed.rkt |  7 +++--
 quad/world-typed.rkt |  2 +-
 quad/wrap-typed.rkt  | 74 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 80 insertions(+), 3 deletions(-)
 create mode 100644 quad/wrap-typed.rkt

diff --git a/quad/quads-typed.rkt b/quad/quads-typed.rkt
index 7a0f6ad1..8a298d36 100644
--- a/quad/quads-typed.rkt
+++ b/quad/quads-typed.rkt
@@ -130,9 +130,9 @@
            
            (: id (case-> 
                   (-> Quad)
-                  ((Option (Listof Any)) (U String Quad) * . -> . Quad)))
+                  ((Option (U QuadAttrs (Listof Any))) (U String Quad) * . -> . Quad)))
            (define (id [attrs #f] . xs)
-             (quad 'id (quadattrs (if (list? attrs) attrs '())) (cast xs QuadList)))
+             (quad 'id (if (quad-attrs? attrs) (cast attrs QuadAttrs) (quadattrs (if (list? attrs) attrs '()))) (cast xs QuadList)))
            
            (: id? (Any . -> . Boolean))
            (define (id? x)
@@ -190,6 +190,9 @@
 
 
 (define-break-type word)
+(: word-string (Quad . -> . String))
+(define (word-string c) 
+  (cast ((inst car QuadListItem Any) (quad-list c)) String))
 (define-break-type page)
 (define-break-type column)
 (define-break-type block)
diff --git a/quad/world-typed.rkt b/quad/world-typed.rkt
index bde8c810..31925ef4 100644
--- a/quad/world-typed.rkt
+++ b/quad/world-typed.rkt
@@ -73,7 +73,7 @@
 
 
 
-(define-parameter default-word-break-list  '(nb "" bb "-"))
+(define-parameter default-word-break-list '(nb "" bb "-"))
 
 (define-parameter optical-overhang 0.8)
 
diff --git a/quad/wrap-typed.rkt b/quad/wrap-typed.rkt
new file mode 100644
index 00000000..f8c94052
--- /dev/null
+++ b/quad/wrap-typed.rkt
@@ -0,0 +1,74 @@
+#lang typed/racket/base
+(require (for-syntax racket/base racket/syntax))
+(require sugar/list sugar/debug racket/list racket/function math/flonum racket/vector math/statistics)
+(require "ocm-typed.rkt" "quads-typed.rkt" "utils-typed.rkt" "measure-typed.rkt" "world-typed.rkt" "logger-typed.rkt")
+
+
+(define-syntax (define/typed stx)
+  (syntax-case stx ()
+    [(_ (proc-name arg ... . rest-arg) type-expr body ...)
+     #'(define/typed proc-name type-expr
+         (λ(arg ... . rest-arg) body ...))]
+    [(_ proc-name type-expr body ...)
+     #'(begin
+         (: proc-name type-expr)
+         (define proc-name body ...))]))
+
+;; predicate for the soft hyphen
+(define/typed (soft-hyphen? x)
+  (String . -> . Boolean)
+  (equal? (format "~a" world:soft-hyphen) x))
+
+;; visible characters that also mark possible breakpoints
+(define/typed (visible-breakable? x)
+  (String . -> . Boolean)
+  (and (member x world:hyphens-and-dashes) #t))
+
+;; invisible characters that denote possible breakpoints
+(define/typed (invisible-breakable? x)
+  (String . -> . Boolean)
+  (and (member x (cons world:empty-string world:spaces)) #t))
+
+;; union of visible & invisible
+(define/typed (breakable? x)
+  (Any . -> . Boolean)
+  (cond
+    [(string? x) (or (visible-breakable? x) (invisible-breakable? x))]
+    [(word? x) (breakable? (word-string (cast x Quad)))]
+    [else #f]))
+
+;; used by insert-spacers to determine which characters 
+;; can be surrounded by stretchy spacers 
+(define/typed (takes-justification-space? x)
+  (Any . -> . Boolean)
+  (whitespace/nbsp? x))
+
+;; test if a quad can be a word break:
+;; either it's an explicit word break,
+;; or it's breakable (and can be converted to a word break)
+(define/typed (possible-word-break-quad? q)
+  (Quad . -> . Boolean)
+  (or (word-break? q) (breakable? q)))
+
+
+;; convert a possible word break into an actual one
+(define/typed (convert-to-word-break q)
+  (Quad . -> . Quad)
+  (when (not (possible-word-break-quad? q))
+    (error 'convert-to-word-break "input is not a possible word break:" q))
+  (define result (cond 
+    [(word-break? q) q]
+    [(word? q)
+     (define str (word-string q)) ; str will be one character long, because we've exploded our input
+     (apply word-break
+            (merge-attrs q ; take q's attributes for formatting purposes
+                         (cond
+                           ;; a space is ordinarily visible, but disappears at the end of a line
+                           [(equal? str " ") (list world:no-break-key " " world:before-break-key "")]
+                           ;; soft hyphen is ordinarily invisible, but appears at the end of a line
+                           [(soft-hyphen? str) (list world:no-break-key "" world:before-break-key "-")]
+                           ;; a visible breakable character is always visible
+                           [(visible-breakable? str) (list world:no-break-key str world:before-break-key str)]
+                           [else (cast (world:default-word-break-list) HashableList)])) (quad-list q))]
+    [else #f]))
+  (or result (error 'convert-to-word-break "result was a not word break for input:" q)))
\ No newline at end of file