index.js — svelte Source File

Source Code

/** @import { AST } from '#compiler'; */
/** @import { Context, Visitors } from 'esrap' */
import * as esrap from 'esrap';
import ts from 'esrap/languages/ts';
import { is_void } from '../../utils.js';

/** Threshold for when content should be formatted on separate lines */
const LINE_BREAK_THRESHOLD = 50;

/**
 * `print` converts a Svelte AST node back into Svelte source code.
 * It is primarily intended for tools that parse and transform components using the compiler’s modern AST representation.
 *
 * `print(ast)` requires an AST node produced by parse with modern: true, or any sub-node within that modern AST.
 * The result contains the generated source and a corresponding source map.
 * The output is valid Svelte, but formatting details such as whitespace or quoting may differ from the original.
 * @param {AST.SvelteNode} ast
 * @param {import('./types.js').Options | undefined} options
 */
export function print(ast, options = undefined) {
	return esrap.print(
		ast,
		/** @type {Visitors<AST.SvelteNode>} */ ({
			...ts({
				comments: ast.type === 'Root' ? ast.comments : [],
				getLeadingComments: options?.getLeadingComments,
				getTrailingComments: options?.getTrailingComments
			}),
			...svelte_visitors,
			...css_visitors
		})
	);
}

/**
 * @param {Context} context
 * @param {AST.SvelteNode} node
 * @param {boolean} allow_inline
 */
function block(context, node, allow_inline = false) {
	const child_context = context.new();
	child_context.visit(node);

	if (child_context.empty()) {
		return;
	}

	if (allow_inline && !child_context.multiline) {
		context.append(child_context);
	} else {
		context.indent();
		context.newline();
		context.append(child_context);
		context.dedent();
		context.newline();
	}
}

/**
 * @param {AST.BaseElement['attributes']} attributes
// ... (795 more lines)