langium
Version:
A language engineering tool for the Language Server Protocol
112 lines • 6.22 kB
JavaScript
/******************************************************************************
* 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());
}
else if (ast.isInfixRuleOperatorList(node)) {
const formatter = this.getNodeFormatter(node);
formatter.keywords('left', 'right').append(Formatting.oneSpace());
formatter.keywords('|').surround(Formatting.oneSpace());
}
else if (ast.isInfixRuleOperators(node)) {
const formatter = this.getNodeFormatter(node);
formatter.keywords('>').prepend(Formatting.newLine());
}
else if (ast.isInfixRule(node)) {
const formatter = this.getNodeFormatter(node);
formatter.keyword('infix').append(Formatting.oneSpace());
formatter.keyword('on').append(Formatting.oneSpace());
const semicolon = formatter.keyword(';');
const colon = formatter.keyword(':');
colon.prepend(Formatting.noSpace());
formatter.interior(colon, semicolon).prepend(Formatting.indent());
}
if (ast.isAbstractElement(node)) {
const formatter = this.getNodeFormatter(node);
formatter.property('cardinality').prepend(Formatting.noSpace());
}
}
}
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