From 0feb7504b1c68cef76b30ea9987e2eae3101714c Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sat, 1 Jul 2017 19:31:43 +0200
Subject: Rewrote LaTeX reader with proper tokenization.

This rewrite is primarily motivated by the need to
get macros working properly.  A side benefit is that the
reader is significantly faster (27s -> 19s in one
benchmark, and there is a lot of room for further
optimization).

We now tokenize the input text, then parse the token stream.

Macros modify the token stream, so they should now be effective
in any context, including math. Thus, we no longer need the clunky
macro processing capacities of texmath.

A custom state LaTeXState is used instead of ParserState.
This, plus the tokenization, will require some rewriting
of the exported functions rawLaTeXInline, inlineCommand,
rawLaTeXBlock.

* Added Text.Pandoc.Readers.LaTeX.Types (new exported module).
  Exports Macro, Tok, TokType, Line, Column.  [API change]
* Text.Pandoc.Parsing: adjusted type of `insertIncludedFile`
  so it can be used with token parser.
* Removed old texmath macro stuff from Parsing.
  Use Macro from Text.Pandoc.Readers.LaTeX.Types instead.
* Removed texmath macro material from Markdown reader.
* Changed types for Text.Pandoc.Readers.LaTeX's
  rawLaTeXInline and rawLaTeXBlock.  (Both now return a String,
  and they are polymorphic in state.)
* Added orgMacros field to OrgState.  [API change]
* Removed readerApplyMacros from ReaderOptions.
  Now we just check the `latex_macros` reader extension.
* Allow `\newcommand\foo{blah}` without braces.

Fixes #1390.
Fixes #2118.
Fixes #3236.
Fixes #3779.
Fixes #934.
Fixes #982.
---
 src/Text/Pandoc/Readers/LaTeX/Types.hs | 48 ++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 src/Text/Pandoc/Readers/LaTeX/Types.hs

(limited to 'src/Text/Pandoc/Readers/LaTeX/Types.hs')

diff --git a/src/Text/Pandoc/Readers/LaTeX/Types.hs b/src/Text/Pandoc/Readers/LaTeX/Types.hs
new file mode 100644
index 000000000..6f84ae1f1
--- /dev/null
+++ b/src/Text/Pandoc/Readers/LaTeX/Types.hs
@@ -0,0 +1,48 @@
+{-
+Copyright (C) 2017 John MacFarlane <jgm@berkeley.edu>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+-}
+
+{- |
+   Module      : Text.Pandoc.Readers.LaTeX.Types
+   Copyright   : Copyright (C) 2017 John MacFarlane
+   License     : GNU GPL, version 2 or above
+
+   Maintainer  : John MacFarlane <jgm@berkeley.edu>
+   Stability   : alpha
+   Portability : portable
+
+Types for LaTeX tokens and macros.
+-}
+module Text.Pandoc.Readers.LaTeX.Types ( Tok(..)
+                                       , TokType(..)
+                                       , Macro(..)
+                                       , Line
+                                       , Column )
+where
+import Data.Text (Text)
+import Text.Parsec.Pos (Line, Column)
+
+data TokType = CtrlSeq Text | Spaces | Newline | Symbol | Word | Comment |
+               Esc1    | Esc2   | Arg Int
+     deriving (Eq, Ord, Show)
+
+data Tok = Tok (Line, Column) TokType Text
+     deriving (Eq, Ord, Show)
+
+data Macro = Macro Int (Maybe [Tok]) [Tok]
+     deriving Show
+
-- 
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