feat(editor): Migrate codemirror-lang-n8n-expression into this monorepo (no-changelog) (#9087)

Co-authored-by: Iván Ovejero <ivov.src@gmail.com>

packages/@n8n/codemirror-lang/src/expressions/README.md

@@ -0,0 +1,26 @@
+# n8n Expression language support
+
+## Usage
+
+```js
+import { parserWithMetaData as n8nParser } from '@n8n/codemirror-lang';
+import { LanguageSupport, LRLanguage } from '@codemirror/language';
+import { parseMixed } from '@lezer/common';
+import { parser as jsParser } from '@lezer/javascript';
+
+const n8nPlusJsParser = n8nParser.configure({
+	wrap: parseMixed((node) => {
+		if (node.type.isTop) return null;
+
+		return node.name === 'Resolvable'
+			? { parser: jsParser, overlay: (node) => node.type.name === 'Resolvable' }
+			: null;
+	}),
+});
+
+const n8nLanguage = LRLanguage.define({ parser: n8nPlusJsParser });
+
+export function n8nExpressionLanguageSupport() {
+	return new LanguageSupport(n8nLanguage);
+}
+```

packages/@n8n/codemirror-lang/src/expressions/expressions.grammar

@@ -0,0 +1,21 @@
+@top Program { entity* }
+
+entity { Plaintext | Resolvable }
+
+@tokens {
+  Plaintext { ![{] Plaintext? | "{" (@eof | ![{] Plaintext?) }
+
+  OpenMarker[closedBy="CloseMarker"] { "{{" }
+
+  CloseMarker[openedBy="OpenMarker"] { "}}" }
+
+  Resolvable {
+    OpenMarker resolvableChar* CloseMarker
+  }
+
+  resolvableChar { unicodeChar | "}" ![}] | "\\}}" }
+
+  unicodeChar { $[\u0000-\u007C] | $[\u007E-\u1FFF] | $[\u20A0-\u20CF] | $[\u{1F300}-\u{1F64F}] }
+}
+
+@detectDelim

packages/@n8n/codemirror-lang/src/expressions/grammar.terms.ts

@@ -0,0 +1,4 @@
+// This file was generated by lezer-generator. You probably shouldn't edit it.
+export const Program = 1,
+	Plaintext = 2,
+	Resolvable = 3;

packages/@n8n/codemirror-lang/src/expressions/grammar.ts

@@ -0,0 +1,18 @@
+// This file was generated by lezer-generator. You probably shouldn't edit it.
+import { LRParser } from '@lezer/lr';
+
+export const parser = LRParser.deserialize({
+	version: 14,
+	states: "nQQOPOOOOOO'#Cb'#CbOOOO'#C`'#C`QQOPOOOOOO-E6^-E6^",
+	stateData: 'Y~OQPORPO~O',
+	goto: 'bVPPPPWP^QRORSRTQOR',
+	nodeNames: '⚠ Program Plaintext Resolvable',
+	maxTerm: 6,
+	skippedNodes: [0],
+	repeatNodeCount: 1,
+	tokenData:
+		"&U~RTO#ob#o#p!h#p;'Sb;'S;=`!]<%lOb~gTQ~O#ob#o#pv#p;'Sb;'S;=`!]<%lOb~yUO#ob#p;'Sb;'S;=`!]<%l~b~Ob~~!c~!`P;=`<%lb~!hOQ~~!kVO#ob#o#p#Q#p;'Sb;'S;=`!]<%l~b~Ob~~!c~#TWO#O#Q#O#P#m#P#q#Q#q#r%Z#r$IS#Q$Lj$Ml#Q;(b;(c%x;(c;(d&O~#pWO#O#Q#O#P#m#P#q#Q#q#r$Y#r$IS#Q$Lj$Ml#Q;(b;(c%x;(c;(d&O~$]TO#q#Q#q#r$l#r;'S#Q;'S;=`%r<%lO#Q~$qWR~O#O#Q#O#P#m#P#q#Q#q#r%Z#r$IS#Q$Lj$Ml#Q;(b;(c%x;(c;(d&O~%^TO#q#Q#q#r%m#r;'S#Q;'S;=`%r<%lO#Q~%rOR~~%uP;=`<%l#Q~%{P;NQ<%l#Q~&RP;=`;JY#Q",
+	tokenizers: [0],
+	topRules: { Program: [0, 1] },
+	tokenPrec: 0,
+});

packages/@n8n/codemirror-lang/src/expressions/index.ts

@@ -0,0 +1,28 @@
+import { LRLanguage, LanguageSupport, foldNodeProp, foldInside } from '@codemirror/language';
+import { styleTags, tags as t } from '@lezer/highlight';
+import { parser } from './grammar';
+
+export const parserWithMetaData = parser.configure({
+	props: [
+		foldNodeProp.add({
+			Application: foldInside,
+		}),
+		styleTags({
+			OpenMarker: t.brace,
+			CloseMarker: t.brace,
+			Plaintext: t.content,
+			Resolvable: t.string,
+		}),
+	],
+});
+
+export const n8nLanguage = LRLanguage.define({
+	parser: parserWithMetaData,
+	languageData: {
+		commentTokens: { line: ';' },
+	},
+});
+
+export function n8nExpression() {
+	return new LanguageSupport(n8nLanguage);
+}

packages/@n8n/codemirror-lang/src/index.ts

@@ -0,0 +1 @@
+export { parserWithMetaData, n8nLanguage } from './expressions';