Add custom macro support

Author: creativecreatorormaybenot

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.1
+
+* Added support for custom macros by exposing `defineMacro` in `package:flutter_math/tex.dart`.
+
 ## 0.3.0+3
 
 * Bump `flutter_svg`.

lib/src/parser/tex/macros.dart

@@ -35,8 +35,6 @@ import 'parse_error.dart';
 import 'symbols.dart';
 import 'token.dart';
 
-Map<String, MacroDefinition> _builtinMacros = {};
-
 class MacroDefinition {
   final MacroExpansion Function(MacroContext context) expand;
   const MacroDefinition(this.expand, {this.unexpandable = false});
@@ -84,8 +82,7 @@ class MacroExpansion {
 }
 
 void defineMacro(String name, MacroDefinition body) {
-  // _builtinMacros ??= {};
-  _builtinMacros[name] = body;
+  builtinMacros[name] = body;
 }
 
 const digitToNumber = {

lib/tex.dart

@@ -1,11 +1,11 @@
-/// Utilites for Tex encoding and parsing.
+/// Utilities for Tex encoding and parsing.
 library tex;
 
 export 'src/ast/syntax_tree.dart'
     show SyntaxTree, SyntaxNode, GreenNode, EquationRowNode;
 export 'src/encoder/tex/encoder.dart'
     show TexEncoder, TexEncoderExt, ListTexEncoderExt;
 export 'src/parser/tex/colors.dart';
-export 'src/parser/tex/macros.dart' show MacroDefinition;
+export 'src/parser/tex/macros.dart' show MacroDefinition, defineMacro;
 export 'src/parser/tex/parser.dart' show TexParser;
 export 'src/parser/tex/settings.dart';

pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_math_fork
 description: Fast and high-quality TeX math equation rendering with pure Dart & Flutter. 
-version: 0.3.0+3
+version: 0.3.1
 homepage: https://github.com/znjameswu/flutter_math
 
 environment: