Added type as an alias for tag #1195

pkg/yqlib/doc/operators/tag.md

@@ -31,6 +31,29 @@ will output
 !!seq
 ```
 
+## type is an alias for tag
+Given a sample.yml file of:
+```yaml
+a: cat
+b: 5
+c: 3.2
+e: true
+f: []
+```
+then
+```bash
+yq '.. | type' sample.yml
+```
+will output
+```yaml
+!!map
+!!str
+!!int
+!!float
+!!bool
+!!seq
+```
+
 ## Set custom tag
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/expression_tokeniser.go

@@ -478,7 +478,8 @@ func initLexer() (*lex.Lexer, error) {
 
 	lexer.Add([]byte(`style`), opAssignableToken(getStyleOpType, assignStyleOpType))
 
-	lexer.Add([]byte(`tag`), opAssignableToken(getTagOpType, assignTagOpType))
+	lexer.Add([]byte(`tag|type`), opAssignableToken(getTagOpType, assignTagOpType))
+
 	lexer.Add([]byte(`anchor`), opAssignableToken(getAnchorOpType, assignAnchorOpType))
 	lexer.Add([]byte(`alias`), opAssignableToken(getAliasOptype, assignAliasOpType))
 	lexer.Add([]byte(`filename`), opToken(getFilenameOpType))

pkg/yqlib/operator_tag_test.go

@@ -18,6 +18,19 @@ var tagOperatorScenarios = []expressionScenario{
 			"D0, P[f], (!!str)::!!seq\n",
 		},
 	},
+	{
+		description: "type is an alias for tag",
+		document:    `{a: cat, b: 5, c: 3.2, e: true, f: []}`,
+		expression:  `.. | type`,
+		expected: []string{
+			"D0, P[], (!!str)::!!map\n",
+			"D0, P[a], (!!str)::!!str\n",
+			"D0, P[b], (!!str)::!!int\n",
+			"D0, P[c], (!!str)::!!float\n",
+			"D0, P[e], (!!str)::!!bool\n",
+			"D0, P[f], (!!str)::!!seq\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `{a: cat, b: 5, c: 3.2, e: true, f: []}`,
@@ -42,6 +55,15 @@ var tagOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::{a: !!mikefarah str}\n",
 		},
 	},
+	{
+		skipDoc:     true,
+		description: "Set custom type",
+		document:    `{a: str}`,
+		expression:  `.a type = "!!mikefarah"`,
+		expected: []string{
+			"D0, P[], (doc)::{a: !!mikefarah str}\n",
+		},
+	},
 	{
 		description: "Find numbers and convert them to strings",
 		document:    `{a: cat, b: 5, c: 3.2, e: true}`,