add hw2

node_modules/langium/lib/grammar/lsp/grammar-formatter.js

@@ -0,0 +1,94 @@
+/******************************************************************************
+ * Copyright 2022 TypeFox GmbH
+ * This program and the accompanying materials are made available under the
+ * terms of the MIT License, which is available in the project root.
+ ******************************************************************************/
+import { AbstractFormatter, Formatting } from '../../lsp/formatter.js';
+import * as ast from '../../languages/generated/ast.js';
+const indentOrSpace = Formatting.fit(Formatting.oneSpace(), Formatting.indent());
+export class LangiumGrammarFormatter extends AbstractFormatter {
+    format(node) {
+        if (ast.isCrossReference(node)) {
+            const formatter = this.getNodeFormatter(node);
+            formatter.properties('type', 'terminal').surround(Formatting.noSpace());
+        }
+        else if (ast.isParserRule(node)) {
+            const formatter = this.getNodeFormatter(node);
+            formatter.keywords('entry', 'fragment', 'returns').append(Formatting.oneSpace());
+            if ((node.inferredType || node.returnType || node.dataType) && node.parameters.length === 0) {
+                formatter.property('name').append(Formatting.oneSpace());
+            }
+            else {
+                formatter.property('name').append(Formatting.noSpace());
+            }
+            formatter.properties('parameters').append(Formatting.noSpace());
+            formatter.keywords(',').append(Formatting.oneSpace());
+            formatter.keywords('<').append(Formatting.noSpace());
+            const semicolon = formatter.keyword(';');
+            const colon = formatter.keyword(':');
+            colon.prepend(Formatting.noSpace());
+            formatter.interior(colon, semicolon).prepend(Formatting.indent());
+            semicolon.prepend(Formatting.fit(Formatting.noSpace(), Formatting.newLine()));
+            formatter.node(node).prepend(Formatting.noIndent());
+        }
+        else if (ast.isTerminalRule(node)) {
+            const formatter = this.getNodeFormatter(node);
+            if (node.type) {
+                formatter.property('name').append(Formatting.oneSpace());
+                formatter.keyword('returns').append(Formatting.oneSpace());
+            }
+            formatter.keywords('hidden', 'terminal', 'fragment').append(Formatting.oneSpace());
+            formatter.keyword(':').prepend(Formatting.noSpace());
+            formatter.keyword(';').prepend(Formatting.fit(Formatting.noSpace(), Formatting.newLine()));
+            formatter.node(node).prepend(Formatting.noIndent());
+        }
+        else if (ast.isAction(node)) {
+            const formatter = this.getNodeFormatter(node);
+            formatter.keyword('{').append(Formatting.noSpace());
+            formatter.keywords('.', '+=', '=').surround(Formatting.noSpace());
+            formatter.keyword('}').prepend(Formatting.noSpace());
+        }
+        else if (ast.isInferredType(node)) {
+            const formatter = this.getNodeFormatter(node);
+            formatter.keywords('infer', 'infers').append(Formatting.oneSpace());
+        }
+        else if (ast.isAssignment(node)) {
+            const formatter = this.getNodeFormatter(node);
+            formatter.keywords('=', '+=', '?=').surround(Formatting.noSpace());
+        }
+        else if (ast.isRuleCall(node)) {
+            const formatter = this.getNodeFormatter(node);
+            formatter.keyword('<').surround(Formatting.noSpace());
+            formatter.keyword(',').append(Formatting.oneSpace());
+            formatter.properties('arguments').append(Formatting.noSpace());
+        }
+        else if (ast.isInterface(node)) {
+            const formatter = this.getNodeFormatter(node);
+            formatter.keyword('interface').append(Formatting.oneSpace());
+            formatter.keyword('extends').prepend(Formatting.oneSpace()).append(indentOrSpace);
+            formatter.keywords(',').prepend(Formatting.noSpace()).append(indentOrSpace);
+            const bracesOpen = formatter.keyword('{');
+            bracesOpen.prepend(Formatting.fit(Formatting.oneSpace(), Formatting.newLine()));
+            const bracesClose = formatter.keyword('}');
+            bracesClose.prepend(Formatting.newLine());
+            formatter.interior(bracesOpen, bracesClose).prepend(Formatting.indent());
+        }
+        else if (ast.isType(node)) {
+            const formatter = this.getNodeFormatter(node);
+            formatter.keyword('type').append(Formatting.oneSpace());
+            formatter.keyword('=').prepend(Formatting.oneSpace()).append(indentOrSpace);
+            formatter.keyword(';').prepend(Formatting.noSpace()).append(Formatting.newLine());
+        }
+        else if (ast.isGrammar(node)) {
+            const formatter = this.getNodeFormatter(node);
+            const nodes = formatter.nodes(...node.rules, ...node.interfaces, ...node.types, ...node.imports);
+            nodes.prepend(Formatting.noIndent());
+            formatter.keyword('grammar').prepend(Formatting.noSpace()).append(Formatting.oneSpace());
+        }
+        if (ast.isAbstractElement(node)) {
+            const formatter = this.getNodeFormatter(node);
+            formatter.property('cardinality').prepend(Formatting.noSpace());
+        }
+    }
+}
+//# sourceMappingURL=grammar-formatter.js.map