knewjade/tetris-fumen

A NPM package to Encode/Decode fumen for tetris

tetris-fumen

tetris-fumen is a parser library to encode/decode tetris game state. Data compatible with fumen, 連続テト譜エディタ can be created and manipulated.

Features

• Tetris game state can be packed into a string and easily unpacked
• Provide simple manipulation for game field
• Decoder supports v115 and v110
• Encoder supports v115 only

Installation

npm install tetris-fumen

Specifications

Field

Field have 10x23 play area and 1 garbage line.

    |__________|          22 // Top
    |__________|          21
    |__________|          20
    |__________|          19
   ~~~~~~~~~~~~~~~         .
    |__________|           .
    |___JJJ____|           .
    |L__ZZJS___|           2
    |L___ZZSSOO|           1
    |LL IIIISOO|  <-  y =  0
    ============
    |XXXXXXXXX_|  <-  y = -1 // Garbage Line
     ^        ^
 x = 0 ...... 9

Mino

The type of mino is represented by below strings:

• 'T', 'I', 'O', 'L', 'J', 'S', 'Z'
• Gray => 'X' or 'GRAY'
• Empty => '_' or 'EMPTY'

The rotation states of mino is represented by below strings:

• No rotate => 'spawn'
• Clockwise => 'right'
• Counter Clockwise => 'left'
• 180 rotation => 'reverse'

The position of mino is represented by (x, y); See harddrop's article SRS/How Guideline SRS Really Works for details

Getting Started

1. Decode

Data used in the code below

Javascript

const { decoder } = require('tetris-fumen');

const data = "v115@vhGRQYHAvItJEJmhCAUGJKJJvMJTNJGBJFKYPAUEzP?EJG98AQmqhECDdCA";
// const data = "https://harddrop.com/fumen/?v115@vhGRQYHAvItJEJmhCAUGJKJJvMJTNJGBJFKYPAUEzP?EJG98AQmqhECDdCA";  // Allow URL format
const pages = decoder.decode(data);

console.log(pages.length);  // 7

console.log(pages[0].comment);  // 'Opening'
console.log(pages[0].operation);  // { type: 'I', rotation: 'spawn', x: 4, y: 0 }

Typescript

import { decoder, Page } from 'tetris-fumen';

const data = 'v115@vhGRQYHAvItJEJmhCAUGJKJJvMJTNJGBJFKYPAUEzP?EJG98AQmqhECDdCA';
// const data = "https://harddrop.com/fumen/?v115@vhGRQYHAvItJEJmhCAUGJKJJvMJTNJGBJFKYPAUEzP?EJG98AQmqhECDdCA";  // Allow URL format
const pages: Page[] = decoder.decode(data);

console.log(pages.length);  // 7

console.log(pages[0].comment);  // 'Opening'
console.log(pages[0].operation);  // { type: 'I', rotation: 'spawn', x: 4, y: 0 }

2.1. Update decoded fumen

Loading data in the code below Generated data by the code below

Javascript

const { decoder, encoder } = require('tetris-fumen');

const pages = decoder.decode('v115@9gI8AeI8AeI8AeI8KeAgH');
pages[0].comment = '4 Lines';
pages[0].operation = { type: 'I', rotation: 'left', x: 9, y: 1 };

console.log(encoder.encode(pages));  // v115@9gI8AeI8AeI8AeI8Ke5IYJA0no2AMOprDTBAAA

2.2. Create from scratch

Data generated by the code below

Javascript

const { encoder, Field } = require('tetris-fumen');

const pages = [];
pages.push({
    field: Field.create(
        'LLL_______' +
        'LOO_______' +
        'JOO_______' +
        'JJJ_______',
        'XXXXXXXXX_',
    ),
    comment: 'Perfect Clear Opener',
});

pages.push({
    operation: {
        type: 'T', rotation: 'left', x: 9, y: 1,
    },
});

pages.push({
    operation: {
        type: 'Z', rotation: 'spawn', x: 7, y: 0,
    },
});

pages.push({
    operation: {
        type: 'S', rotation: 'spawn', x: 8, y: 2,
    },
});

pages.push({
    comment: 'Success: 61.19 %',
    flags: {
        mirror: true,
    },
});

pages.push({
    comment: '(Mirror)',
});

console.log(encoder.encode(pages));  // v115@9gilGeglRpGeg...../~/.....ciNEyoAVB

Typescript

import { encoder, EncodePage, Field } from 'tetris-fumen';

const pages: EncodePage[] = [];
pages.push({
    field: Field.create(
        'LLL_______' +
        'LOO_______' +
        'JOO_______' +
        'JJJ_______',
        'XXXXXXXXX_',
    ),
    comment: 'Perfect Clear Opener',
});

pages.push({
    operation: {
        type: 'T', rotation: 'left', x: 9, y: 1,
    },
});

pages.push({
    operation: {
        type: 'Z', rotation: 'spawn', x: 7, y: 0,
    },
});

pages.push({
    operation: {
        type: 'S', rotation: 'spawn', x: 8, y: 2,
    },
});

pages.push({
    comment: 'Success: 61.19 %',
    flags: {
        mirror: true,
    },
});

pages.push({
    comment: '(Mirror)',
});

console.log(encoder.encode(pages));  // v115@9gilGeglRpGeg...../~/.....ciNEyoAVB

3. Page details

Javascript

const { decoder } = require('tetris-fumen');
const pages = decoder.decode('v115@vhGRQYHAvItJEJmhCAUGJKJJvMJTNJGBJFKYPAUEzP?EJG98AQmqhECDdCA');
const page = pages[0];

/* index: Page number, begin from 0 */
console.log(page.index);  // 0

/* comment: Comment on the page */
console.log(page.comment);  // 'Opening'

/* operation: Placed mino states */
console.log(page.operation);  // { type: 'I', rotation: 'spawn', x: 4, y: 0 }

/* flags: Fumen options on the page
     - colorize: If true, apply guideline color to block
     - lock: If true, lock mino after placement
     - mirror: If true, flip field horizontally after placement
     - quiz: If true, comment is in quiz format
     - rise: If true, rise garbage after placement */  
console.log(page.flags);// { colorize: true, lock: true, mirror: false, quiz: false, rise: false }

/* field: Field object on the page before applying operation and flags */
const field = page.field;
console.log(field.at(4, 0));  // '_'  // EMPTY

field.put(page.operation);  // field object is mutable
console.log(field.at(4, 0));  // 'I'

/* mino: Same as `operation`, but have a more flexible operators */
const mino = page.mino();
console.log(mino.type, mino.rotation, mino.x, mino.y);  // I spawn 4 0
console.log(mino.operation());  // == page.operation
console.log(mino.positions());  // [{ x: 3, y: 0 }, { x: 4, y: 0 }, { x: 5, y: 0 }, { x: 6, y: 0 }]
                                // the position of the blocks
console.log(mino.isValid());  // true  // Whether it's correct as mino
mino.x = -1;
console.log(mino.isValid());  // false

4. Field details

Javascript

/* Create field */
const field = Field.create(
    'LLL_______' +
    'LOO_______' +
    'JOO_______' +
    'JJJ_______',  // field
    'XXXXXXXXX_',  // garbage (optional)
);

/* Get block type */
field.at(9, 0);  // '_'

/* Set block */
field.set(9, 0, 'O');
field.set(9, 1, 'GRAY');
field.set(9, 2, 'EMPTY');

field.set(0, -1, 'X');  // same as 'GRAY'
field.set(9, -1, '_');  // same as 'EMPTY'

/** Current:
      LLL_______
      LOO_______
      JOO______X
      JJJ______O
      XXXXXXXXX_
 */

/* Check if can fill piece */
field.canFill({ type: 'I', rotation: 'left', x: 9, y: 3 });  // true

/* Fill piece even if not on the ground, and return the mino as the placed */
field.fill({ type: 'I', rotation: 'left', x: 9, y: 3 });


/* Check if can fill and lock piece on the ground */
field.canLock({ type: 'O', rotation: 'spawn', x: 4, y: 0 });  // true
field.canLock({ type: 'O', rotation: 'spawn', x: 4, y: 1 });  // false

/* Harddrop and fill piece to the ground, and return the mino as the placed */
field.put({ type: 'O', rotation: 'spawn', x: 4, y: 10 });  // return `{ type: 'O', rotation: 'spawn', x: 4, y: 0 }`

/* Convert to string 
                        default
     @param `reduced`   true    If true, EMPTY line is not parsed
     @param `separator` '\n'    Specify characters between lines 
     @param `garbage`   true    If true, garbage is parsed */
console.log(field.str());

/** Current:
      _________I
      _________I
      LLL______I
      LOO______I
      JOO_OO___X
      JJJ_OO___O
      XXXXXXXXX_
 */

// Copy field
const copied = field.copy();
console.log(copied.str() === field.str());  // true
copied.set(0, 0, 'T');
console.log(copied.str() === field.str());  // false

tetris-fumen's Issues

Search params loader is incompatible with raw fumen code

fumen codes with special characters do not load properly through direct link
example: v115@9gF8DeF8CeG8BeH8CeA8JeAgWEAa+VWC

the fumen link is able to load the fumen from its url code but the pc solver link is not

this is because special characters in the fumen code are raw and get parsed differently than intended

field.fill can't draw floating pieces

data: https://harddrop.com/fumen/?v115@vhAVLn
Code:

const {decoder} = require("tetris-fumen");
const pages = decoder.decode("v115@vhAVLn");
console.log(pages[0].field.str());
pages[0].field.fill(pages[0].operation);

Result:

Error: Cannot fill piece on field

REPL

Is this intended? Quote from README:

Fill piece even if not on the ground, and return the mino as the placed

If floating pieces are not allowed, how does it differ from field.put?

Make field.fill return piece position

I'd like to draw the current operation with a lightened color. I need the position after the piece is filled in the field. Example:

const pages = decoder.decode(data);
const field = pages[0].field.copy();
const changedTiles = field.fill(pages[0].operation);

for (let y = 0; y < 20; y++) {
  for (let x = 0; x < 10; x++) {
    myCanvas.draw(x, y, field.at(x, y));
  }
}
for (const [x, y] of changedTiles) {
  myCanvas.lighten(x, y);
}

Maybe we can also add this feature to field.put?