chore: add toml language

.gitmodules

@@ -127,3 +127,6 @@
 [submodule "tree-sitter-c-sharp-pro"]
 	path = lang/semgrep-grammars/src/tree-sitter-c-sharp-pro
 	url = https://github.com/tree-sitter/tree-sitter-c-sharp.git
+[submodule "lang/semgrep-grammars/src/tree-sitter-toml"]
+	path = lang/semgrep-grammars/src/tree-sitter-toml
+	url = git@github.com:tree-sitter-grammars/tree-sitter-toml.git

lang/semgrep-grammars/lang/toml

@@ -0,0 +1 @@
+../src/semgrep-toml

lang/semgrep-grammars/src/semgrep-toml/Makefile

@@ -0,0 +1 @@
+../Makefile.common

lang/semgrep-grammars/src/semgrep-toml/grammar.js

@@ -0,0 +1,29 @@
+/*
+  semgrep-toml
+
+  Extends the standard toml grammar with semgrep pattern constructs.
+*/
+
+const base_grammar = require('tree-sitter-toml/grammar');
+
+module.exports = grammar(base_grammar, {
+  name: 'toml',
+
+  conflicts: ($, previous) => previous.concat([
+  ]),
+
+  /*
+     Support for semgrep ellipsis ('...') and metavariables ('$FOO'),
+     if they're not already part of the base grammar.
+  */
+  rules: {
+  /*
+    semgrep_ellipsis: $ => '...',
+
+    _expression: ($, previous) => choice(
+      $.semgrep_ellipsis,
+      ...previous.members
+    ),
+  */
+  }
+});

lang/semgrep-grammars/src/semgrep-toml/prep

@@ -0,0 +1 @@
+../prep.common

lang/toml/Makefile

@@ -0,0 +1 @@
+../Makefile.common

lang/toml/extensions.txt

@@ -0,0 +1,6 @@
+# File extensions for the target language, one per line. This is used for
+# collecting parsing stats from the repos specified in 'projects.txt'. e.g.:
+#
+# .h
+# .c
+#

lang/toml/fyi.list

@@ -0,0 +1,3 @@
+semgrep-grammars/src/tree-sitter-toml/LICENSE
+semgrep-grammars/src/tree-sitter-toml/grammar.js
+semgrep-grammars/src/semgrep-toml/grammar.js

lang/toml/projects.txt

@@ -0,0 +1,3 @@
+# Git URLs of publicly-accessible projects to be used for parsing stats,
+# one per line.
+#