From 3c79caa8ab477d5cf80d4eb6541900804cea0339 Mon Sep 17 00:00:00 2001 From: Benjamin Barenblat Date: Thu, 30 Jul 2015 19:54:54 -0400 Subject: Initial commit of Ur/Web Markdown library --- .gitignore | 7 +++ LICENSE | 202 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ README.md | 23 +++++++ lib.urp | 5 ++ markdown.ur | 92 +++++++++++++++++++++++++++ markdown.urs | 14 +++++ 6 files changed, 343 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 README.md create mode 100644 lib.urp create mode 100644 markdown.ur create mode 100644 markdown.urs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..5ad5207 --- /dev/null +++ b/.gitignore @@ -0,0 +1,7 @@ +# -*- conf -*- + +# Editor backup files +*~ +\#* +.\#* +.*.swp diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d645695 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + 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. diff --git a/README.md b/README.md new file mode 100644 index 0000000..1bb2f6c --- /dev/null +++ b/README.md @@ -0,0 +1,23 @@ +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 new file mode 100644 index 0000000..93f62fb --- /dev/null +++ b/lib.urp @@ -0,0 +1,5 @@ +library $/regex + +$/list +$/string +markdown diff --git a/markdown.ur b/markdown.ur new file mode 100644 index 0000000..fdc5e66 --- /dev/null +++ b/markdown.ur @@ -0,0 +1,92 @@ +(* © 2004 John Gruber +© 2015 Benjamin Barenblat + +Licensed under the Apache License, Version 2.0 (the "License"); you may not +use this file except in compliance with the License. You may obtain a copy +of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software distributed +under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR +CONDITIONS OF ANY KIND, either express or implied. See the License for the +specific language governing permissions and limitations under the License. *) + +fun lines (text : string) : list string = + case text of + "" => [] + | s => case String.split s #"\n" of + None => s :: [] + | Some (before, after) => before :: lines after + +fun unlines (lines : list string) : string = + List.foldr (fn x y => x ^ "\n" ^ y) "" lines + +fun spaces n = + case n of + 0 => "" + | x => spaces (n - 1) ^ " " + +(* Standardize line endings. *) +fun standardize_line_endings text = + Regex.replace "\r" "\n" (* Mac to Unix *) + (Regex.replace "\r\n" "\n" (* DOS to Unix *) + text) + +(* Make sure the text ends with a couple of newlines. *) +fun ensure_ends_with_newlines text = text ^ "\n\n" + +(* Convert tabs to spaces. *) +fun detab text = + let + fun detab_line line = + case String.split line #"\t" of + None => line + | Some (before, after) => + detab_line (before ^ spaces (8 - String.length before % 8) ^ after) + in + unlines (List.mp detab_line (lines text)) + end + +(* Strip any lines consisting of only spaces and tabs. This makes subsequent +regexes easier to write, because we can match consecutive blank lines with +/\n+/ instead of something contorted like /[ \t]*\n+/. *) +fun strip_blank text = + Regex.replace "(^|\n) +($|\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+") + ("$1\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+" "

$1

\n\n" + (Regex.replace "(?:^|\n)(.+) *\n=+ *\n+" + "

$1

\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 -- cgit v1.2.3