Add Indentation rules

Author: RedCMD

README.md

@@ -6,6 +6,7 @@
 
 - Syntax highlighting
 - Bracket matching
+- Indentation rules
 - YAML versions [1.2](https://yaml.org/spec/1.2.2), [1.1](https://yaml.org/spec/1.1/), [1.0](https://yaml.org/spec/1.0/) and [1.3](https://spec.yaml.io/main/spec/1.3.0/)
 
 
@@ -14,6 +15,6 @@
 - Previously known [Issues](https://github.com/RedCMD/YAML-Syntax-Highlighter/issues/1)
 - Original YAML [grammar](https://github.com/textmate/yaml.tmbundle)
 - Atom's YAML [grammar](https://github.com/atom/language-yaml)
-- Offical YAML [website](https://yaml.org/)
+- Official YAML [website](https://yaml.org/)
 - Github [repo](https://github.com/RedCMD/YAML-Syntax-Highlighter)
 - Marketplace [extension](https://marketplace.visualstudio.com/items?itemName=RedCMD.yaml-syntax)

language-configuration.json

@@ -32,15 +32,130 @@
 		["{", "}"],
 		["[", "]"]
 	],
+	// markers that can be folded
 	"folding": {
 		"offSide": true,
 		"markers": {
 			"start": "^[ \t]*#[ \t]*region\\b|^---[ \t]*(#.*)?$",
 			"end": "^[ \t]*#[ \t]*endregion\\b|^\\.{3}[ \t]*(#.*)?$"
 		}
 	},
-	"indentationRules": {
-		"increaseIndentPattern": "^\\s*.*(:|-) ?(&\\w+)?(\\{[^}\"']*|\\[[^\\]\"']*)?$",
-		"decreaseIndentPattern": "^\\s+[\\]\\}]$"
-	}
+	// Only the first successful rule is chosen
+	"onEnterRules": [
+		{
+			// indent 1 space after block-scalar with indentation-indicator
+			"action": {
+				"appendText": " ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "([ \t]+|^)[|>][+-]?1"
+		},
+		{
+			"action": {
+				"appendText": "  ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "([ \t]+|^)[|>][+-]?2"
+		},
+		{
+			"action": {
+				"appendText": "   ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "([ \t]+|^)[|>][+-]?3"
+		},
+		{
+			"action": {
+				"appendText": "    ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "([ \t]+|^)[|>][+-]?4"
+		},
+		{
+			"action": {
+				"appendText": "     ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "([ \t]+|^)[|>][+-]?5"
+		},
+		{
+			"action": {
+				"appendText": "      ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "([ \t]+|^)[|>][+-]?6"
+		},
+		{
+			"action": {
+				"appendText": "       ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "([ \t]+|^)[|>][+-]?7"
+		},
+		{
+			"action": {
+				"appendText": "        ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "([ \t]+|^)[|>][+-]?8"
+		},
+		{
+			// indent 9 spaces after block-scalar with indentation-indicator
+			"action": {
+				"appendText": "         ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "([ \t]+|^)[|>][+-]?9"
+		},
+		{
+			// - block-map: # with an empty value OR block-scalar. Prefixed with a block-seq
+			"action": {
+				"appendText": "    ",
+				"indent": "none"
+			},
+			"beforeText": "(^| |\t)-[ \t]+[^#,\\[\\]{}].*:(([ \t]+[|>][+-]?)?([ \t]+#.*)?|[ \t]*)$"
+		},
+		{
+			// indent 2 spaces after non-root block-scalar
+			"action": {
+				"appendText": "  ",
+				"indent": "none",
+			},
+			"afterText": "^(?![ \t]*#)",
+			"beforeText": "[-?:][ \t]+[|>][+-]?[ \t]*(#.*)?$"
+		},
+		{
+			// block-map: cursor_must_be_before_value
+			"action": {
+				"appendText": "  ",
+				"indent": "none"
+			},
+			"beforeText": "(?<!( |\t|^)(#|\\?[ \t]).*):([ \t]*|[ \t]+#.*)$"
+		},
+		{
+			// - #empty block-seq
+			"action": {
+				"appendText": "  ",
+				"indent": "none"
+			},
+			"beforeText": "(^| |\t)-([ \t]*|[ \t]+#.*)$"
+		},
+		{
+			// - block-seq
+			"action": {
+				"appendText": "- ",
+				"indent": "none"
+			},
+			"beforeText": "(^| |\t)-[ \t].*$"
+		}
+	]
 }