Add Macaulay2 lexer (#1791)

* Add Macaulay2 lexer

* Update symbols for Macaulay2 1.18

* Match whitespace characters in Macaulay2 lexer

* Add states for strings/comments in Macaulay2 lexer

* Update Macaulay2 lexer tests for string/comment edge cases

* Improve comment and string matching in Macaulay2 lexer

Instead of matching each character one at a time, we match all
characters without special meaning together.

* Update Macaulay2 test output

* Update Macaulay2 lexer symbols for 1.19 release

* Move "auto-generated" comment in Macaulay2 lexer down a few lines

* Fix underline length in Macaulay2 lexer docstring

* Add url field for Macaulay2 lexer

* Bump copyright year for Macaulay2 lexer

2 files changed, 107 insertions, 0 deletions

diff --git a/tests/examplefiles/macaulay2/test.m2 b/tests/examplefiles/macaulay2/test.m2
new file mode 100644
index 00000000..3bf0cf28
--- /dev/null
+++ b/tests/examplefiles/macaulay2/test.m2
@@ -0,0 +1,23 @@
+"this is a string"
+
+"this is how we \"escape quotes\" in a string"
+
+"this is how " | "we concatenate strings"
+
+///this is also
+a string///
+
+///to escape forward slashes (/) in a string, we
+use an even number in the middle //// or an odd number
+(at least 3) at the end///
+
+-- this is a comment
+
+-* this is
+also a comment *-
+
+-* two comments *- 2 + 2 -* on the same line *-
+
+for i from 0 to 10 do print QQ
+
+end
diff --git a/tests/examplefiles/macaulay2/test.m2.output b/tests/examplefiles/macaulay2/test.m2.output
new file mode 100644
index 00000000..1042273e
--- /dev/null
+++ b/tests/examplefiles/macaulay2/test.m2.output
@@ -0,0 +1,84 @@
+'"'           Literal.String
+'this is a string' Literal.String
+'"'           Literal.String
+'\n\n'        Text.Whitespace
+
+'"'           Literal.String
+'this is how we ' Literal.String
+'\\"'         Literal.String
+'escape quotes' Literal.String
+'\\"'         Literal.String
+' in a string' Literal.String
+'"'           Literal.String
+'\n\n'        Text.Whitespace
+
+'"'           Literal.String
+'this is how ' Literal.String
+'"'           Literal.String
+' '           Text.Whitespace
+'|'           Text
+' '           Text.Whitespace
+'"'           Literal.String
+'we concatenate strings' Literal.String
+'"'           Literal.String
+'\n\n'        Text.Whitespace
+
+'///'         Literal.String
+'this is also\na string' Literal.String
+'///'         Literal.String
+'\n\n'        Text.Whitespace
+
+'///'         Literal.String
+'to escape forward slashes (' Literal.String
+'/'           Literal.String
+') in a string, we\nuse an even number in the middle ' Literal.String
+'////'        Literal.String
+' or an odd number\n(at least 3) at the end' Literal.String
+'///'         Literal.String
+'\n\n'        Text.Whitespace
+
+'-- this is a comment' Comment.Single
+'\n\n'        Text.Whitespace
+
+'-*'          Comment.Multiline
+' this is\nalso a comment ' Comment.Multiline
+'*-'          Comment.Multiline
+'\n\n'        Text.Whitespace
+
+'-*'          Comment.Multiline
+' two comments ' Comment.Multiline
+'*-'          Comment.Multiline
+' '           Text.Whitespace
+'2'           Text
+' '           Text.Whitespace
+'+'           Text
+' '           Text.Whitespace
+'2'           Text
+' '           Text.Whitespace
+'-*'          Comment.Multiline
+' on the same line ' Comment.Multiline
+'*-'          Comment.Multiline
+'\n\n'        Text.Whitespace
+
+'for'         Keyword
+' '           Text.Whitespace
+'i'           Text
+' '           Text.Whitespace
+'from'        Keyword
+' '           Text.Whitespace
+'0'           Text
+' '           Text.Whitespace
+'to'          Keyword
+' '           Text.Whitespace
+'1'           Text
+'0'           Text
+' '           Text.Whitespace
+'do'          Keyword
+' '           Text.Whitespace
+'print'       Name.Function
+' '           Text.Whitespace
+'QQ'          Name.Builtin
+'\n\n'        Text.Whitespace
+
+'end'         Name.Constant
+'\n'          Text.Whitespace