langium-cli/lib/generator/grammar-serializer.js

CLI for Langium - the language engineering tool

/******************************************************************************
 * Copyright 2021 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 { expandToNode, joinToNode, normalizeEOL, toString } from 'langium/generate';
import { generatedHeader } from './node-util.js';
export function serializeGrammar(services, grammars, config) {
    const node = expandToNode `
        ${generatedHeader}
    `.appendNewLine().appendTemplateIf(!!config.langiumInternal) `

        import type { Grammar } from '../../languages/generated/ast${config.importExtension}';
        import { loadGrammarFromJson } from '../../utils/grammar-loader${config.importExtension}';
    `.appendTemplateIf(!config.langiumInternal) `

        import type { Grammar } from 'langium';
        import { loadGrammarFromJson } from 'langium';
    `.appendNewLine();
    node.append(joinToNode(grammars.filter(grammar => grammar.name), grammar => {
        const production = config.mode === 'production';
        const delimiter = production ? "'" : '`';
        const uriConverter = (uri) => {
            // We expect the grammar to be self-contained after the transformations we've done before
            throw new Error(`Unexpected reference to element in document: ${uri.toString()}`);
        };
        const serializedGrammar = services.serializer.JsonSerializer.serialize(grammar, {
            space: production ? undefined : 2,
            comments: true,
            uriConverter
        });
        // The json serializer returns strings with \n line delimiter by default
        // We need to translate these line endings to the OS specific line ending
        let json = normalizeEOL(serializedGrammar
            .replace(/\\/g, '\\\\')
            .replace(new RegExp(delimiter, 'g'), '\\' + delimiter));
        if (!production) {
            // Escape ${ in template strings
            json = json.replace(/\${/g, '\\${');
        }
        return expandToNode `

                    let loaded${grammar.name}Grammar: Grammar | undefined;
                    export const ${grammar.name}Grammar = (): Grammar => loaded${grammar.name}Grammar ?? (loaded${grammar.name}Grammar = loadGrammarFromJson(${delimiter}${json}${delimiter}));
                `;
    }, { appendNewLineIfNotEmpty: true }));
    return toString(node);
}
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