add grammar, syntax highlighting for go.mod and go.sum(#2344)

* add go.mod and go.sum support

* rename to Checksum

package.json

@@ -72,6 +72,36 @@
         "aliases": [
           "Go"
         ]
+      },
+      {
+        "id": "go.mod",
+        "extensions": [
+          "go.mod"
+        ],
+        "aliases": [
+          "Go Module File"
+        ]
+      },
+      {
+        "id": "go.sum",
+        "extensions": [
+          "go.sum"
+        ],
+        "aliases": [
+          "Go Checksum File"
+        ]
+      }
+    ],
+    "grammars": [
+      {
+        "language": "go.mod",
+        "scopeName": "go.mod",
+        "path": "./syntaxes/go.mod.tmGrammar.json"
+      },
+      {
+        "language": "go.sum",
+        "scopeName": "go.sum",
+        "path": "./syntaxes/go.sum.tmGrammar.json"
       }
     ],
     "snippets": [

syntaxes/go.mod.tmGrammar.json

@@ -0,0 +1,163 @@
+{
+	"scopeName": "go.mod",
+	"patterns": [
+		{
+			"include": "#comments"
+		},
+		{
+			"include": "#directive"
+		}
+	],
+	"repository": {
+		"directive": {
+			"patterns": [
+				{
+					"comment": "Multi-Line directive",
+					"begin": "(\\w+)\\s+\\(",
+					"beginCaptures": {
+						"1": {
+							"name": "keyword.go.mod"
+						}
+					},
+					"end": "\\)",
+					"patterns": [
+						{
+							"include": "#arguments"
+						}
+					]
+				},
+				{
+					"comment": "Single-Line directive",
+					"match": "(\\w+)\\s+(.*)",
+					"captures": {
+						"1": {
+							"name": "keyword.go.mod"
+						},
+						"2": {
+							"patterns": [
+								{
+									"include": "#arguments"
+								}
+							]
+						}
+					}
+				}
+			]
+		},
+		"arguments": {
+			"patterns": [
+				{
+					"include": "#comments"
+				},
+				{
+					"include": "#double_quoted_string"
+				},
+				{
+					"include": "#raw_quoted_string"
+				},
+				{
+					"include": "#operator"
+				},
+				{
+					"include": "#semver"
+				},
+				{
+					"include": "#unquoted_string"
+				}
+			]
+		},
+		"comments": {
+			"patterns": [
+				{
+					"begin": "//",
+					"beginCaptures": {
+						"0": {
+							"name": "punctuation.definition.comment.go.mod"
+						}
+					},
+					"end": "$",
+					"name": "comment.line.double-slash.go.mod"
+				}
+			]
+		},
+		"operator": {
+			"match": "(=>)",
+			"name": "operator.go.mod"
+		},
+		"unquoted_string": {
+			"comment": "Unquoted string",
+			"match": "[^\\s]+",
+			"name": "string.unquoted.go.mod"
+		},
+		"double_quoted_string": {
+			"comment": "Interpreted string literals",
+			"begin": "\"",
+			"beginCaptures": {
+				"0": {
+					"name": "punctuation.definition.string.begin.go.mod"
+				}
+			},
+			"end": "\"",
+			"endCaptures": {
+				"0": {
+					"name": "punctuation.definition.string.end.go.mod"
+				}
+			},
+			"name": "string.quoted.double",
+			"patterns": [
+				{
+					"include": "#string_escaped_char"
+				},
+				{
+					"include": "#string_placeholder"
+				}
+			]
+		},
+		"raw_quoted_string": {
+			"comment": "Raw string literals",
+			"begin": "`",
+			"beginCaptures": {
+				"0": {
+					"name": "punctuation.definition.string.begin.go.mod"
+				}
+			},
+			"end": "`",
+			"endCaptures": {
+				"0": {
+					"name": "punctuation.definition.string.end.go.mod"
+				}
+			},
+			"name": "string.quoted.raw",
+			"patterns": [
+				{
+					"include": "#string_placeholder"
+				}
+			]
+		},
+		"semver": {
+			"comment": "Semver version strings (v1.2.3)",
+			"match": "v(?:0|[1-9]\\d*)\\.(?:0|[1-9]\\d*)\\.(?:0|[1-9]\\d*)(?:-[\\da-z-]+(?:\\.[\\da-z-]+)*)?(?:\\+[\\da-z-]+(?:\\.[\\da-z-]+)*)?",
+			"name": "constant.language.go.mod"
+		},
+		"string_escaped_char": {
+			"patterns": [
+				{
+					"match": "\\\\([0-7]{3}|[abfnrtv\\\\'\"]|x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8})",
+					"name": "constant.character.escape.go.mod"
+				},
+				{
+					"match": "\\\\[^0-7xuUabfnrtv\\'\"]",
+					"name": "invalid.illegal.unknown-escape.go.mod"
+				}
+			]
+		},
+		"string_placeholder": {
+			"patterns": [
+				{
+					"match": "%(\\[\\d+\\])?([\\+#\\-0\\x20]{,2}((\\d+|\\*)?(\\.?(\\d+|\\*|(\\[\\d+\\])\\*?)?(\\[\\d+\\])?)?))?[vT%tbcdoqxXUbeEfFgGsp]",
+					"name": "constant.other.placeholder.go.mod"
+				}
+			]
+		}
+	}
+}

syntaxes/go.sum.tmGrammar.json

@@ -0,0 +1,44 @@
+{
+	"scopeName": "go.sum",
+	"patterns": [
+		{
+			"include": "#checksum"
+		},
+		{
+			"include": "#semver"
+		},
+		{
+			"include": "#unquoted_string"
+		}
+	],
+	"repository": {
+		"checksum": {
+			"comment": "Checksum",
+			"match": "h1:([^\\s]+)=",
+			"captures": {
+				"1": {
+					"patterns": [
+						{
+							"match": "[a-zA-Z\\d+\\/]{43}",
+							"name": "string.unquoted.go.sum"
+						},
+						{
+							"match": ".*",
+							"name": "invalid.illegal.unknown-hash.go.sum"
+						}
+					]
+				}
+			}
+		},
+		"semver": {
+			"comment": "Semver version strings (v1.2.3)",
+			"match": "v(?:0|[1-9]\\d*)\\.(?:0|[1-9]\\d*)\\.(?:0|[1-9]\\d*)(?:-[\\da-z-]+(?:\\.[\\da-z-]+)*)?(?:\\+[\\da-z-]+(?:\\.[\\da-z-]+)*)?",
+			"name": "constant.language.go.sum"
+		},
+		"unquoted_string": {
+			"comment": "Unquoted string",
+			"match": "[^\\s]+",
+			"name": "string.unquoted.go.sum"
+		}
+	}
+}