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/** @import { BaseNode, Command, Visitors, PrintOptions } from './types' */
import { encode } from '@jridgewell/sourcemap-codec';
import { Context, dedent, indent, margin, newline, space } from './context.js';
/** @type {(str: string) => string} str */
let btoa = () => {
throw new Error('Unsupported environment: `window.btoa` or `Buffer` should be supported.');
};
if (typeof window !== 'undefined' && typeof window.btoa === 'function') {
btoa = (str) => window.btoa(unescape(encodeURIComponent(str)));
} else if (typeof Buffer === 'function') {
btoa = (str) => Buffer.from(str, 'utf-8').toString('base64');
}
class SourceMap {
version = 3;
/** @type {string[]} */
names = [];
/**
* @param {[number, number, number, number][][]} mappings
* @param {PrintOptions} opts
*/
constructor(mappings, opts) {
this.sources = [opts.sourceMapSource || null];
this.sourcesContent = [opts.sourceMapContent || null];
this.mappings = opts.sourceMapEncodeMappings === false ? mappings : encode(mappings);
}
/**
* Returns a JSON representation suitable for saving as a `*.map` file
*/
toString() {
return JSON.stringify(this);
}
/**
* Returns a base64-encoded JSON representation suitable for inlining at the bottom of a file with `//# sourceMappingURL={...}`
*/
toUrl() {
return 'data:application/json;charset=utf-8;base64,' + btoa(this.toString());
}
}
/**
* @template {BaseNode} [T=BaseNode]
* @param {T} node
* @param {Visitors<T>} visitors
* @param {PrintOptions} opts
* @returns {{ code: string, map: any }} // TODO
*/
export function print(node, visitors, opts = {}) {
/** @type {Command[]} */
const commands = [];
// @ts-expect-error some nonsense I don't understand
const context = new Context(visitors, commands);
context.visit(node);
/** @typedef {[number, number, number, number]} Segment */
let code = '';
let current_column = 0;
/** @type {Segment[][]} */
let mappings = [];
/** @type {Segment[]} */
let current_line = [];
/** @param {string} str */
function append(str) {
code += str;
for (let i = 0; i < str.length; i += 1) {
if (str[i] === '\n') {
mappings.push(current_line);
current_line = [];
current_column = 0;
} else {
current_column += 1;
}
}
}
let current_newline = '\n';
const indent_str = opts.indent ?? '\t';
let needs_newline = false;
let needs_margin = false;
let needs_space = false;
/** @param {Command} command */
function run(command) {
if (Array.isArray(command)) {
for (let i = 0; i < command.length; i += 1) {
run(command[i]);
}
return;
}
if (typeof command === 'number') {
if (command === newline) {
needs_newline = true;
} else if (command === margin) {
needs_margin = true;
} else if (command === space) {
needs_space = true;
} else if (command === indent) {
current_newline += indent_str;
} else if (command === dedent) {
current_newline = current_newline.slice(0, -indent_str.length);
}
return;
}
if (needs_newline) {
append(needs_margin ? '\n' + current_newline : current_newline);
} else if (needs_space) {
append(' ');
}
needs_margin = needs_newline = needs_space = false;
if (typeof command === 'string') {
append(command);
return;
}
if (command.type === 'Location') {
current_line.push([
current_column,
0, // source index is always zero
command.line - 1,
command.column
]);
}
}
for (let i = 0; i < commands.length; i += 1) {
run(commands[i]);
}
mappings.push(current_line);
/** @type {SourceMap} */
let map;
return {
code,
// create sourcemap lazily in case we don't need it
get map() {
return (map ??= new SourceMap(mappings, opts));
}
};
}
// it sucks that we have to export the class rather than just
// re-exporting it via public.d.ts, but otherwise TypeScript
// gets confused about private fields because it is really dumb!
export { Context };
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