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import type { Root, RootContent } from 'hast';
import style from './dark-style.json';
const rules = new Map(
Object.entries(style).map(([k, v]) => [k, new Map(Object.entries(v))]),
);
export function getColor(classList: string[]): string | undefined {
console.assert(classList.length <= 1, `classList too long`);
const styles =
classList.length === 1 ? rules.get(`.${classList[0]}`) : new Map();
console.assert((styles?.size ?? 0) <= 1, `more styles than just color`);
const color = styles?.get('color');
return color;
}
export type Parsable = [string, string] | { lang: string; code: string };
export interface Parsed<T extends Char = Char, L extends Line = Line> {
language: string;
lines: L[];
chars: T[];
}
export interface Tokenized<T extends Token = Token, L extends Line = Line> {
language: string;
lines: L[];
tokens: T[];
}
export interface Line {
tags: string[];
number?: number;
}
export interface Text {
classList: string[];
sections: string[];
}
export interface ColorCoded {
color?: string;
background?: string;
}
export interface Char extends Text {
char: string;
token: [number, number];
}
export interface RepChar extends Char {
from: 'new' | 'old';
}
export interface FormChar extends Char {
from: 'create' | 'keep' | 'delete';
}
export interface Token {
token: string;
location: [number, number];
}
export function parse(language: string, code: string): Parsed<Char> {
if (starryNight == null) {
throw new Error('you must await ready() to initialize package');
}
const scope = starryNight.flagToScope(language);
if (typeof scope !== 'string') {
throw new Error(`language ${language} not found`);
}
const parsed = starryNight.highlight(code, scope);
const converted = recurse(parsed);
return markTree({
language,
lines: [],
chars: converted,
});
}
function recurse(
node: Root | RootContent,
classes: string[] = [],
result: Char[] = [],
) {
if (node.type === 'element') {
console.assert(node.tagName === 'span', `tag was not a span`);
const className = (node.properties?.className ?? []) as string[];
console.assert(Array.isArray(className), `className was not an array`);
console.assert(className.length >= 1, `tag did not have a className`);
console.assert(className.length <= 1, `tag had too many classNames`);
node.children.forEach((child) =>
recurse(child, [...classes, className[0]], result),
);
} else if (node.type === 'root') {
node.children.forEach((child) => recurse(child, [], result));
} else if (node.type === 'text') {
for (let i = 0; i < node.value.length; i++) {
console.assert(classes.length <= 1, `character has too many classes`);
result.push({
char: node.value[i],
classList: classes,
token: [i, node.value.length],
sections: [],
});
}
}
return result;
}
const nextLineRegex = /^\/\/:[^\S\n]*next-line[^\S\n]+([^\n]+?)[^\S\n]*$/;
const thisLineRegex = /^\/\/:[^\S\n]*this-line[^\S\n]+([^\n]+?)[^\S\n]*$/;
const blockStartRegex = /^\/\/<<[^\S\n]*([^\n]+?)[^\S\n]*$/;
const blockEndRegex = /^\/\/>>[^\S\n]*$/;
const sectionStartRegex = /^\/\*<<[^\S\n]*([^\n]+?)[^\S\n]*\*\/$/;
const sectionEndRegex = /^\/\*>>[^\S\n]*\*\/$/;
const tagRegex = /^\/\*<[^\S\r\n]*(.*?)[^\S\r\n]*>\*\/$/;
const specialTypes: [RegExp, string[]][] = [
[nextLineRegex, ['nextLine', 'line']],
[thisLineRegex, ['thisLine', 'line']],
[blockStartRegex, ['blockStart', 'line']],
[blockEndRegex, ['blockEnd', 'line']],
[sectionStartRegex, ['sectionStart', 'span']],
[sectionEndRegex, ['sectionEnd', 'span']],
[tagRegex, ['tag', 'span']],
];
function getSpecialType(span: string) {
for (const [regex, result] of specialTypes) {
if (regex.test(span)) return result;
}
return [];
}
function* spans(chars: Char[]): Generator<[Char[], number], void, void> {
let i = 0;
while (i < chars.length) {
const char = chars[i];
console.assert(char.token[0] === 0, `token was not beginning of span`);
yield [chars.slice(i, i + char.token[1]), i];
i += char.token[1];
}
}
function markTree(parsed: Parsed<Char>): Parsed<Char> {
const chars = parsed.chars;
const lineCount =
1 +
chars.reduce((prior, { char }) => {
return prior + (char === '\n' ? 1 : 0);
}, 0);
const lines: { tags: string[] }[] = new Array(lineCount)
.fill(1)
.map(() => ({ tags: [] }));
let ln = 0;
const blocks = [];
const sections = [];
let sectionHold = null;
const result: Char[] = [];
for (let i = 0; i < chars.length; i++) {
const char = chars[i];
if (char.token[0] === 0 && sectionHold != null) {
sections.unshift(sectionHold);
sectionHold = null;
}
result.push({
...char,
sections: [...sections],
});
if (char.token[0] !== 0) {
continue;
}
const span = getSpan(chars, i);
if (char.char === '\n') {
ln++;
lines[ln].tags.push(...blocks);
} else if (char.classList.length === 1 && char.classList[0] === 'pl-c') {
if (nextLineRegex.test(span)) {
const name = span.match(nextLineRegex)?.[1] as string;
lines[ln + 1].tags.push(name);
} else if (thisLineRegex.test(span)) {
const name = span.match(thisLineRegex)?.[1] as string;
lines[ln].tags.push(name);
} else if (blockStartRegex.test(span)) {
blocks.push(span.match(blockStartRegex)?.[1] as string);
} else if (blockEndRegex.test(span)) {
blocks.pop();
} else if (sectionStartRegex.test(span)) {
sectionHold = span.match(sectionStartRegex)?.[1] as string;
} else if (sectionEndRegex.test(span)) {
sections.shift();
}
}
}
return {
...parsed,
lines,
chars: result,
};
}
/**
* @internal
* @param input - parsed or parsable variable
* @returns parsed code
*/
export function ensureParsed(input: Parsed | Parsable): Parsed {
if (Array.isArray(input)) {
return parse(input[0], input[1]);
} else if (typeof input === 'object' && 'code' in input) {
return parse(input.lang, input.code);
} else {
return input as Parsed<Char>;
}
}
let starryNight: {
flagToScope: (s: string) => string | undefined;
highlight: (c: string, s: string) => Root;
} | null = null;
const starryNightPromise = createStarryNight(all);
starryNightPromise.then((sn) => (starryNight = sn));
export function ready() {
return starryNightPromise;
}
export function toString(code: Parsed<Char> | Parsable): string {
const parsed = ensureParsed(code);
const result: string[] = [];
parsed.chars.forEach(({ char }) => result.push(char));
return result.join('');
}
function getSpan(tree: Char[], at: number) {
const [back, length] = tree[at].token;
const start = at - back;
const end = start + length;
let result = '';
for (let i = start; i < end; i++) {
result += tree[i].char;
}
return result;
}
/**
* Removes all code-fns tags.
*
* @param code - the parsed or parsable code to clean
*/
export function clean(code: Parsed<Char> | Parsable): Parsed<Char> {
const parsed = ensureParsed(code);
const result: Char[] = [];
let lineNumber = 0;
let finalNumber = 1;
let lineSkip = false;
const lines = [];
for (const [span] of spans(parsed.chars)) {
if (span.length === 1 && span[0].char === '\n') lineNumber++;
if (lineSkip) {
console.assert(
span.length === 1 && span[0].char === '\n',
`expected a new line`,
);
lineSkip = false;
continue;
} else if (span.length === 1 && span[0].char === '\n') {
lines.push({
...parsed.lines[lineNumber],
number: finalNumber,
});
finalNumber++;
}
console.assert(span[0].classList.length === 1, `multiple classes found`);
const specialTypes = getSpecialType(
span.reduce((text, { char }) => text + char, ''),
);
if (span[0].classList[0] !== 'pl-c' || specialTypes.length === 0) {
result.push(...span);
} else if (specialTypes.includes('line')) {
lineSkip = true;
}
}
lines.push({
...parsed.lines[lineNumber],
number: finalNumber,
});
if (lineSkip) {
lines.pop();
console.assert(
result[result.length - 1].char === '\n',
`expected a new line`,
);
result.pop();
}
return {
...parsed,
chars: result,
lines,
};
}
/**
* @internal
*/
export function last<T>(arr: T[][]): T[] {
if (arr.length === 0) arr.push([]);
return arr[arr.length - 1];
}
export function substitute(
code: Parsed<Char> | Parsable,
subs: Record<string, string>,
): Parsed<RepChar> {
const parsed = ensureParsed(code);
const language = parsed.language;
const tree = parsed.chars;
const replacements: [number, number][] = [];
let final = '';
tree.forEach((char, at) => {
if (char.token[0] !== 0) return;
const span = getSpan(tree, at);
if (char.classList[0] === 'pl-c' && tagRegex.test(span)) {
const [, name] = span.match(tagRegex) as [string, string];
if (name in subs) {
const rep = subs[name];
final += rep;
if (rep !== '') replacements.push([at, rep.length]);
} else {
final += span;
}
} else {
final += span;
}
});
const reparsed = parse(language, final);
let [r, ri] = [0, 0];
let inReplacement = false;
return {
language,
lines: [],
chars: reparsed.chars.map((char: Char, at: number) => {
if (inReplacement) {
ri++;
if (ri === replacements[r][1]) {
inReplacement = false;
r++;
}
} else if (r < replacements.length) {
const [rat] = replacements[r];
if (rat === at) {
inReplacement = true;
}
}
return {
...char,
from: inReplacement ? 'new' : 'old',
};
}),
};
}
export function transform(
code: Parsed<Char> | Parsable,
start: Record<string, string>,
final: Record<string, string>,
): FormChar[] {
const tree = ensureParsed(code);
const before = substitute(tree, start);
const after = substitute(tree, final);
let [bat] = [0];
let [aat] = [0];
const chars: FormChar[] = [];
while (bat < before.chars.length || aat < after.chars.length) {
const bchar = before.chars[bat] ?? null;
const achar = after.chars[aat] ?? null;
if (bchar?.from === 'old' && achar?.from === 'old') {
chars.push({
...achar,
from: 'keep',
});
bat++;
aat++;
} else if (bchar?.from === 'new') {
chars.push({
...bchar,
from: 'delete',
});
bat++;
} else if (achar?.from === 'new') {
chars.push({
...achar,
from: 'create',
});
aat++;
}
}
return chars;
}
export interface Transition {
delete: [string, [number, number], string?][];
create: [string, [number, number], string?][];
retain: [string, [number, number], [number, number], string?][];
}
export function transition(
code: Parsed<Char> | Parsable,
start: Record<string, string>,
final: Record<string, string>,
): Transition {
const tree = ensureParsed(code);
const chars = transform(tree, start, final);
const result: Transition = {
delete: [],
create: [],
retain: [],
};
let [dln, dat] = [0, 0];
let [cln, cat] = [0, 0];
let lastColor: symbol | undefined | string = Symbol();
let lastFrom: symbol | string = Symbol();
chars.forEach((char) => {
const color = getColor(char.classList);
if (char.char === '\n') {
if (char.from === 'keep' || char.from === 'create') {
cln++;
cat = 0;
}
if (char.from === 'keep' || char.from === 'delete') {
dln++;
dat = 0;
}
lastColor = Symbol();
lastFrom = Symbol();
} else if (color === lastColor && char.from === lastFrom) {
if (char.from === 'delete') {
last(result.delete)[0] += char.char;
dat++;
} else if (char.from === 'create') {
last(result.create)[0] += char.char;
cat++;
} else if (char.from === 'keep') {
last(result.retain)[0] += char.char;
dat++;
cat++;
}
lastFrom = char.from;
lastColor = color;
} else {
if (char.from === 'delete') {
result.delete.push([
char.char,
[dln, dat],
...((color ? [color] : []) as [string?]),
]);
dat++;
} else if (char.from === 'create') {
result.create.push([
char.char,
[cln, cat],
...((color ? [color] : []) as [string?]),
]);
cat++;
} else if (char.from === 'keep') {
result.retain.push([
char.char,
[dln, dat],
[cln, cat],
...((color ? [color] : []) as [string?]),
]);
dat++;
cat++;
}
lastFrom = char.from;
lastColor = color;
}
});
return result;
}
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