New Racket wrapper.

Has an almost complete low-level interface, mostly missing the iterator
thing.  Also some higher-level interface: some thin convenient wrappers,
and conversions to/from sexpr format.

1 files changed, 188 insertions, 0 deletions

diff --git a/wrappers/wrapper.rkt b/wrappers/wrapper.rkt
new file mode 100644
index 0000000..91714ae
--- /dev/null
+++ b/wrappers/wrapper.rkt
@@ -0,0 +1,188 @@
+#lang racket/base
+
+;; Lowlevel interface
+
+(module low-level racket/base
+
+  (require ffi/unsafe ffi/unsafe/define)
+
+  (provide (all-defined-out))
+
+  (define-ffi-definer defcmark (ffi-lib "libcmark"))
+
+  (define _cmark_node_type
+    (_enum '(none
+             ;; Block
+             document block-quote list item code-block
+             html paragraph header hrule
+             ;; Inline
+             text softbreak linebreak code inline-html
+             emph strong link image)))
+  (define _cmark_list_type
+    (_enum '(no_list bullet_list ordered_list)))
+  (define _cmark_delim_type
+    (_enum '(no_delim period_delim paren_delim)))
+  (define _cmark_opts
+    (_bitmask '(sourcepos = 1 hardbreaks = 2 normalize = 4 smart = 8)))
+
+  (define-cpointer-type _node)
+
+  (defcmark cmark_markdown_to_html
+    (_fun [bs : _bytes] [_int = (bytes-length bs)] _cmark_opts
+          -> [r : _bytes] -> (begin0 (bytes->string/utf-8 r) (free r))))
+
+  (defcmark cmark_parse_document
+    (_fun [bs : _bytes] [_int = (bytes-length bs)] _cmark_opts
+          -> _node))
+
+  (defcmark cmark_render_html
+    (_fun _node _cmark_opts
+          -> [r : _bytes] -> (begin0 (bytes->string/utf-8 r) (free r))))
+
+  (defcmark cmark_node_new              (_fun _cmark_node_type -> _node))
+  (defcmark cmark_node_free             (_fun _node -> _void))
+
+  (defcmark cmark_node_next             (_fun _node -> _node/null))
+  (defcmark cmark_node_previous         (_fun _node -> _node/null))
+  (defcmark cmark_node_parent           (_fun _node -> _node/null))
+  (defcmark cmark_node_first_child      (_fun _node -> _node/null))
+  (defcmark cmark_node_last_child       (_fun _node -> _node/null))
+
+  (defcmark cmark_node_get_user_data    (_fun _node -> _racket))
+  (defcmark cmark_node_set_user_data    (_fun _node _racket -> _bool))
+  (defcmark cmark_node_get_type         (_fun _node -> _cmark_node_type))
+  (defcmark cmark_node_get_type_string  (_fun _node -> _bytes))
+  (defcmark cmark_node_get_literal      (_fun _node -> _string))
+  (defcmark cmark_node_set_literal      (_fun _node _string -> _bool))
+  (defcmark cmark_node_get_header_level (_fun _node -> _int))
+  (defcmark cmark_node_set_header_level (_fun _node _int -> _bool))
+  (defcmark cmark_node_get_list_type    (_fun _node -> _cmark_list_type))
+  (defcmark cmark_node_set_list_type    (_fun _node _cmark_list_type -> _bool))
+  (defcmark cmark_node_get_list_delim   (_fun _node -> _cmark_delim_type))
+  (defcmark cmark_node_set_list_delim   (_fun _node _cmark_delim_type -> _bool))
+  (defcmark cmark_node_get_list_start   (_fun _node -> _int))
+  (defcmark cmark_node_set_list_start   (_fun _node _int -> _bool))
+  (defcmark cmark_node_get_list_tight   (_fun _node -> _bool))
+  (defcmark cmark_node_set_list_tight   (_fun _node _bool -> _bool))
+  (defcmark cmark_node_get_fence_info   (_fun _node -> _string))
+  (defcmark cmark_node_set_fence_info   (_fun _node _string -> _bool))
+  (defcmark cmark_node_get_url          (_fun _node -> _string))
+  (defcmark cmark_node_set_url          (_fun _node _string -> _bool))
+  (defcmark cmark_node_get_title        (_fun _node -> _string))
+  (defcmark cmark_node_set_title        (_fun _node _string -> _bool))
+  (defcmark cmark_node_get_start_line   (_fun _node -> _int))
+  (defcmark cmark_node_get_start_column (_fun _node -> _int))
+  (defcmark cmark_node_get_end_line     (_fun _node -> _int))
+  (defcmark cmark_node_get_end_column   (_fun _node -> _int))
+
+  (defcmark cmark_node_unlink           (_fun _node -> _void))
+  (defcmark cmark_node_insert_before    (_fun _node _node -> _bool))
+  (defcmark cmark_node_insert_after     (_fun _node _node -> _bool))
+  (defcmark cmark_node_prepend_child    (_fun _node _node -> _bool))
+  (defcmark cmark_node_append_child     (_fun _node _node -> _bool))
+  (defcmark cmark_consolidate_text_nodes (_fun _node -> _void))
+
+  )
+
+;; Rackety interface
+
+(module high-level racket/base
+
+  (require (submod ".." low-level) ffi/unsafe)
+
+  (provide cmark-markdown-to-html)
+  (define (cmark-markdown-to-html str [options '(normalize smart)])
+    (cmark_markdown_to_html (if (bytes? str) str (string->bytes/utf-8 str))
+                            options))
+
+  (require (for-syntax racket/base racket/syntax))
+  (define-syntax (make-getter+setter stx)
+    (syntax-case stx ()
+      [(_ name) (with-syntax ([(getter setter)
+                               (map (λ(op) (format-id #'name "cmark_node_~a_~a"
+                                                      op #'name))
+                                    '(get set))])
+                  #'(cons getter setter))]))
+  (define-syntax-rule (define-getters+setters name [type field ...] ...)
+    (define name (list (list 'type (make-getter+setter field) ...) ...)))
+  (define-getters+setters getters+setters
+    [header header_level] [code-block fence_info]
+    [link url title] [image url title]
+    [list list_type list_delim list_start list_tight])
+
+  (provide cmark->sexpr)
+  (define (cmark->sexpr node)
+    (define text (cmark_node_get_literal node))
+    (define type (cmark_node_get_type node))
+    (define children
+      (let loop ([node (cmark_node_first_child node)])
+        (if (not node) '()
+            (cons (cmark->sexpr node) (loop (cmark_node_next node))))))
+    (define info
+      (cond [(assq type getters+setters)
+             => (λ(gss) (map (λ(gs) ((car gs) node)) (cdr gss)))]
+            [else '()]))
+    (define (assert-no what-not b)
+      (when b (error 'cmark->sexpr "unexpected ~a in ~s" what-not type)))
+    (cond [(memq type '(document paragraph header block-quote list item
+                        emph strong link image))
+           (assert-no 'text text)
+           (list type info children)]
+          [(memq type '(text code code-block html inline-html
+                        softbreak linebreak hrule))
+           (assert-no 'children (pair? children))
+           (list type info text)]
+          [else (error 'cmark->sexpr "unknown type: ~s" type)]))
+
+  (provide sexpr->cmark)
+  (define (sexpr->cmark sexpr) ; assumes valid input, as generated by the above
+    (define (loop sexpr)
+      (define type (car sexpr))
+      (define info (cadr sexpr))
+      (define data (caddr sexpr))
+      (define node (cmark_node_new type))
+      (let ([gss (assq type getters+setters)])
+        (when gss
+          (unless (= (length (cdr gss)) (length info))
+            (error 'sexpr->cmark "bad number of info values in ~s" sexpr))
+          (for-each (λ(gs x) ((cdr gs) node x)) (cdr gss) info)))
+      (cond [(string? data) (cmark_node_set_literal node data)]
+            [(not data) (void)]
+            [(list? data)
+             (for ([child (in-list data)])
+               (cmark_node_append_child node (sexpr->cmark child)))]
+            [else (error 'sexpr->cmark "bad data in ~s" sexpr)])
+      node)
+    (define root (loop sexpr))
+    (register-finalizer root cmark_node_free)
+    root)
+
+  ;; Registers a `cmark_node_free` finalizer
+  (provide cmark-parse-document)
+  (define (cmark-parse-document str [options '(normalize smart)])
+    (define root (cmark_parse_document
+                  (if (bytes? str) str (string->bytes/utf-8 str))
+                  options))
+    (register-finalizer root cmark_node_free)
+    root)
+
+  (provide cmark-render-html)
+  (define (cmark-render-html root [options '(normalize smart)])
+    (cmark_render_html root options)))
+
+#; ;; sample use
+(begin
+  (require 'high-level racket/string)
+  (cmark-render-html
+   (cmark-parse-document
+    (string-join '("foo"
+                   "==="
+                   ""
+                   "> blah"
+                   ">"
+                   "> blah *blah* `bar()` blah:"
+                   ">"
+                   ">     function foo() {"
+                   ">       bar();"
+                   ">     }")
+                 "\n"))))