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authorBenjamin Barenblat <bbaren@mit.edu>2015-07-30 19:54:54 -0400
committerBenjamin Barenblat <bbaren@mit.edu>2015-07-30 19:54:54 -0400
commit3c79caa8ab477d5cf80d4eb6541900804cea0339 (patch)
treed3e9470eefe15831ce4c3e4e7a877adb0b336e88
Initial commit of Ur/Web Markdown libraryHEADmaster
-rw-r--r--.gitignore7
-rw-r--r--LICENSE202
-rw-r--r--README.md23
-rw-r--r--lib.urp5
-rw-r--r--markdown.ur92
-rw-r--r--markdown.urs14
6 files changed, 343 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+# -*- conf -*-
+
+# Editor backup files
+*~
+\#*
+.\#*
+.*.swp
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+
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diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
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+Markdown for Ur/Web
+===================
+
+**This library is a work in progress. The usual warnings about API instability
+apply. Use at your own risk.**
+
+This library provides a parser for John Gruber’s [Markdown][] language.
+
+License
+-------
+
+© 2015 Benjamin Barenblat
+
+Licensed under the [Apache License, Version 2.0][Apache-2.0] (the
+‘License’); you may not use this file except in compliance with
+the License. Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an _‘as is’
+basis, without warranties or conditions of any kind_, either express or
+implied. See the License for the specific language governing permissions
+and limitations under the License.
+
+[Apache-2.0]: http://www.apache.org/licenses/LICENSE-2.0
+[Markdown]: https://daringfireball.net/projects/markdown/
diff --git a/lib.urp b/lib.urp
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--- /dev/null
+++ b/lib.urp
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+library $/regex
+
+$/list
+$/string
+markdown
diff --git a/markdown.ur b/markdown.ur
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index 0000000..fdc5e66
--- /dev/null
+++ b/markdown.ur
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+(* © 2004 John Gruber <http://daringfireball.net/projects/markdown/>
+© 2015 Benjamin Barenblat
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not
+use this file except in compliance with the License. You may obtain a copy
+of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License. *)
+
+fun lines (text : string) : list string =
+ case text of
+ "" => []
+ | s => case String.split s #"\n" of
+ None => s :: []
+ | Some (before, after) => before :: lines after
+
+fun unlines (lines : list string) : string =
+ List.foldr (fn x y => x ^ "\n" ^ y) "" lines
+
+fun spaces n =
+ case n of
+ 0 => ""
+ | x => spaces (n - 1) ^ " "
+
+(* Standardize line endings. *)
+fun standardize_line_endings text =
+ Regex.replace "\r" "\n" (* Mac to Unix *)
+ (Regex.replace "\r\n" "\n" (* DOS to Unix *)
+ text)
+
+(* Make sure the text ends with a couple of newlines. *)
+fun ensure_ends_with_newlines text = text ^ "\n\n"
+
+(* Convert tabs to spaces. *)
+fun detab text =
+ let
+ fun detab_line line =
+ case String.split line #"\t" of
+ None => line
+ | Some (before, after) =>
+ detab_line (before ^ spaces (8 - String.length before % 8) ^ after)
+ in
+ unlines (List.mp detab_line (lines text))
+ end
+
+(* Strip any lines consisting of only spaces and tabs. This makes subsequent
+regexes easier to write, because we can match consecutive blank lines with
+/\n+/ instead of something contorted like /[ \t]*\n+/. *)
+fun strip_blank text =
+ Regex.replace "(^|\n) +($|\n)" "\n" text
+
+fun do_headers text =
+ (* TODO(bbaren): run_span_gamut on the inner data of the header tags. *)
+ let
+ (* As of 30 July 2015, the compiler generates incorrect C if I don't
+ specify 'text' as a parameter and instead partially apply
+ 'Regex.replace'. *)
+ fun atx_header level text =
+ let
+ val level_string = show level
+ in
+ Regex.replace ("(?:^|\n)\#{" ^ level_string ^ "} *(.+?) *\#*\n+")
+ ("<h" ^ level_string ^ ">$1</h" ^ level_string ^ ">\n\n")
+ text
+ end
+ in
+ (atx_header 1
+ (atx_header 2
+ (atx_header 3
+ (atx_header 4
+ (atx_header 5
+ (atx_header 6
+ (Regex.replace "(?:^|\n)(.+) *\n-+ *\n+" "<h2>$1</h2>\n\n"
+ (Regex.replace "(?:^|\n)(.+) *\n=+ *\n+"
+ "<h1>$1</h1>\n\n"
+ text))))))))
+ end
+
+fun run_block_gamut text =
+ do_headers text
+
+fun render markdown =
+ run_block_gamut
+ (strip_blank
+ (detab
+ (ensure_ends_with_newlines
+ (standardize_line_endings markdown))))
diff --git a/markdown.urs b/markdown.urs
new file mode 100644
index 0000000..27857b0
--- /dev/null
+++ b/markdown.urs
@@ -0,0 +1,14 @@
+(* © 2015 Benjamin Barenblat
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not
+use this file except in compliance with the License. You may obtain a copy
+of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License. *)
+
+val render : string -> string