Contribute TextMate grammar for jikespg grammars

jikespg is the parser generator used in ECJ.
This TextMate grammar provides basic syntax highlighting for the grammar
files that jikespg uses.
In order to try out this grammar,
try editing
https://github.com/eclipse-jdt/eclipse.jdt.core/blob/master/org.eclipse.jdt.core.compiler.batch/grammar/java.g
,
or try editing some of the example grammars in the jikespg repo:
https://github.com/daveshields/jikespg

I wrote this grammar.
It doesn't come from the VS Code repository,
so it can't be auto-updated from there.

Signed-off-by: David Thompson <davthomp@redhat.com>

org.eclipse.tm4e.language_pack/jikespg/jikespg.tmLanguage.json

@@ -0,0 +1,167 @@
+{
+  "$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
+  "name": "Jikespg Grammar",
+  "fileTypes": [
+    "g"
+  ],
+  "patterns": [
+    {
+      "include": "#keywords"
+    },
+    {
+      "include": "#options"
+    },
+    {
+      "include": "#sections"
+    },
+    {
+      "include": "#comments"
+    },
+    {
+      "include": "#embeddedCode"
+    },
+    {
+      "include": "#macro"
+    },
+    {
+      "include": "#productions"
+    }
+  ],
+  "repository": {
+    "keywords": {
+      "patterns": [
+        {
+          "name": "keyword.control.jikespg",
+          "match": "\\b(?<=\\$)([Dd][Ee][Ff][Ii][Nn][Ee]|[Ee][Mm][Pp][Tt][Yy]|[Ee][Rr][Rr][Oo][Rr]|[Ee][Oo][Ll]|[Ee][Oo][Ff]|[Ee][Nn][Dd]|[Rr][Uu][Ll][Ee][Ss]|[Aa][Ll][Ii][Aa][Ss]|[Ss][Tt][Aa][Rr][Tt]|[Nn][Aa][Mm][Ee][Ss])\\b",
+          "comment": "Dollar prefixed keywords. keywords are case insensitive"
+        }
+      ]
+    },
+    "comments": {
+      "patterns": [
+        {
+          "name": "comment.line.double-dash.jikespg",
+          "match": "(?<!')(--.*)"
+        }
+      ]
+    },
+    "options": {
+      "patterns": [
+        {
+          "begin": "\\b(?<=%)([Oo][Pp][Tt][Ii][Oo][Nn][Ss])",
+          "end": "$\\n?",
+          "beginCaptures": {
+            "1": {
+              "name": "keyword.control.less.jikespg"
+            }
+          },
+          "patterns": [
+            {
+              "match": "([^=,]+)(?:=([^,]+))?",
+              "captures": {
+                "1": {
+                  "name": "variable.name.jikespg"
+                },
+                "2": {
+                  "name": "constant.language.jikespg"
+                }
+              }
+            }
+          ]
+        }
+      ]
+    },
+    "sections": {
+      "begin": "\\b(?<=\\$)([Tt][Ee][Rr][Mm][Ii][Nn][Aa][Ll][Ss])\\b",
+      "end": "(?=\\$)",
+      "beginCaptures": {
+        "1": {
+          "name": "keyword.control"
+        }
+      },
+      "patterns": [
+        {
+          "name": "constant.language",
+          "match": "\\b(\\w+)\\b"
+        },
+        {
+          "include": "#comments"
+        }
+      ]
+    },
+    "embeddedCode": {
+      "patterns": [
+        {
+          "name": "string.quoted.triple.jikespg",
+          "begin": "\\s*/\\.",
+          "end": "\\./"
+        },
+        {
+          "name": "string.quoted.triple.jikespg",
+          "begin": "\\s*/:",
+          "end": ":/"
+        }
+      ]
+    },
+    "macro": {
+      "patterns": [
+        {
+          "match": "\\b(?<=\\$)(\\w+)\\b",
+          "name": "entity.name.function"
+        }
+      ]
+    },
+    "productions": {
+      "patterns": [
+        {
+          "name": "variable.name.jikespg",
+          "begin": "^\\s*([%\\{\\}\\[\\]\\w]+)\\s*(::=)",
+          "end": "(?:(?=--)|$\\n?)",
+          "beginCaptures": {
+            "1": {
+              "name": "variable.name.jikespg"
+            },
+            "2": {
+              "name": "keyword.operator.jikespg"
+            }
+          }
+        },
+        {
+          "name": "variable.name.jikespg",
+          "begin": "^\\s*([%\\{\\}\\[\\]\\w]+)\\s*(->)",
+          "end": "(?:(?=--)|$\\n?)",
+          "beginCaptures": {
+            "1": {
+              "name": "variable.name.jikespg"
+            },
+            "2": {
+              "name": "keyword.operator.jikespg"
+            }
+          }
+        },
+        {
+          "name": "variable.name.jikespg",
+          "begin": "^\\s*(\\|)",
+          "end": "(?:(?=--)|$\\n?)",
+          "beginCaptures": {
+            "1": {
+              "name": "keyword.operator.jikespg"
+            }
+          }
+        },
+        {
+          "comment": "if not yet captured, it's probably a continued definition line. use hard symbols to avoid reparsing something",
+          "begin": "^",
+          "end": "(?:(?:/.)|(?:\\$)|(?=--)|$\\n?)",
+          "patterns": [
+            {
+              "name": "variable.name.jikespg",
+              "match": "([%\\{\\}\\[\\]\\w]+)"
+            }
+          ]
+        }
+      ]
+    }
+  },
+  "scopeName": "lngpck.source.jikespg"
+}

org.eclipse.tm4e.language_pack/jikespg/language-configuration.json

@@ -0,0 +1,25 @@
+{
+  "comments": {
+    "lineComment": "--"
+  },
+  "brackets": [
+    ["/.", "./"],
+    ["{", "}"],
+    ["[", "]"],
+    ["(", ")"]
+  ],
+  "autoClosingPairs": [
+    ["{", "}"],
+    ["[", "]"],
+    ["(", ")"],
+    ["\"", "\""],
+    ["'", "'"]
+  ],
+  "surroundingPairs": [
+    ["{", "}"],
+    ["[", "]"],
+    ["(", ")"],
+    ["\"", "\""],
+    ["'", "'"]
+  ]
+}

org.eclipse.tm4e.language_pack/plugin.xml

@@ -306,6 +306,18 @@
         <scopeNameContentTypeBinding scopeName="lngpck.source.json.lines" contentTypeId="lng.jsonl"/>
     </extension>
 
+    <!-- jikespg -->
+    <extension point="org.eclipse.core.contenttype.contentTypes">
+        <content-type id="lng.jikespg" base-type="org.eclipse.tm4e.language_pack.basetype" name="jikespg grammar" priority="low" file-extensions="g" />
+    </extension>
+    <extension point="org.eclipse.tm4e.languageconfiguration.languageConfigurations">
+        <languageConfiguration contentTypeId="lng.jikespg" path="jikespg/language-configuration.json"/>
+    </extension>
+    <extension point="org.eclipse.tm4e.registry.grammars">
+        <grammar scopeName="lngpck.source.jikespg" path="jikespg/jikespg.tmLanguage.json"/>
+        <scopeNameContentTypeBinding scopeName="lngpck.source.jikespg" contentTypeId="lng.jikespg"/>
+    </extension>
+
     <!-- julia -->
     <extension point="org.eclipse.core.contenttype.contentTypes">
         <content-type id="lng.julia" base-type="org.eclipse.tm4e.language_pack.basetype" name="Julia (Syntax Highlighting)" priority="low" file-extensions="jl"/>
@@ -704,4 +716,4 @@
     -->
 
 
-</plugin>
+</plugin>