71008d5a20
The game fails to load under Firefox 77.0 with the very helpful error
message,
SyntaxError: invalid regexp group format-c2m.js:1:1
Turns out that it doesn't like the `(?<=^|\n)` lookbehind group in
the CLUE regexp. It seems lookbehind support wasn't added until FF 78,
according to the big table[1]. Switch it to a multiline regexp instead.
[1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#Browser_compatibility
522 lines
19 KiB
JavaScript
522 lines
19 KiB
JavaScript
import * as util from './format-util.js';
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import TILE_TYPES from './tiletypes.js';
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const CC2_DEMO_INPUT_MASK = {
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drop: 0x01,
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down: 0x02,
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left: 0x04,
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right: 0x08,
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up: 0x10,
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swap: 0x20,
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cycle: 0x40,
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};
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class CC2Demo {
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constructor(buf) {
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this.buf = buf;
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this.bytes = new Uint8Array(buf);
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// byte 0 is unknown, always 0?
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this.force_floor_seed = this.bytes[1];
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this.blob_seed = this.bytes[2];
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}
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*[Symbol.iterator]() {
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let l = this.bytes.length;
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if (l % 2 === 0) {
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l--;
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}
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let input = new Set;
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let t = 0;
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for (let p = 3; p < l; p += 2) {
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// The first byte measures how long the /previous/ input remains
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// valid, so yield that first. Note that this is measured in 60Hz
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// frames, so we need to convert to 20Hz tics by subtracting 3
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// frames at a time.
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let delay = this.bytes[p];
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if (delay === 0xff)
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break;
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t += delay;
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while (t >= 3) {
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t -= 3;
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yield input;
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}
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let input_mask = this.bytes[p + 1];
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let is_player_2 = ((input_mask & 0x80) !== 0);
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// TODO handle player 2
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if (is_player_2)
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continue;
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for (let [action, bit] of Object.entries(CC2_DEMO_INPUT_MASK)) {
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if ((input_mask & bit) === 0) {
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input.delete(action);
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}
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else {
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input.add(action);
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}
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}
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}
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}
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}
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// TODO assert that direction + next match the tile types
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const TILE_ENCODING = {
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0x01: 'floor',
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0x02: 'wall',
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0x03: 'ice',
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0x04: 'ice_sw',
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0x05: 'ice_nw',
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0x06: 'ice_ne',
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0x07: 'ice_se',
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0x08: 'water',
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0x09: 'fire',
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0x0a: 'force_floor_n',
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0x0b: 'force_floor_e',
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0x0c: 'force_floor_s',
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0x0d: 'force_floor_w',
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0x0e: 'green_wall',
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0x0f: 'green_floor',
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//0x10: 'teleport_red',
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0x11: 'teleport_blue',
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//0x12: 'teleport_yellow',
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//0x13: 'teleport_green',
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0x14: 'exit',
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//0x15: 'slime',
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0x16: ['player', '#direction', '#next'],
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0x17: ['dirt_block', '#direction', '#next'],
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0x18: ['walker', '#direction', '#next'],
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0x19: ['glider', '#direction', '#next'],
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0x1a: ['ice_block', '#direction', '#next'],
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0x1b: ['thinwall_s', '#next'],
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0x1c: ['thinwall_e', '#next'],
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0x1d: ['thinwall_se', '#next'],
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0x1e: 'gravel',
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0x1f: 'button_green',
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0x20: 'button_blue',
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0x21: ['tank_blue', '#direction', '#next'],
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0x22: 'door_red',
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0x23: 'door_blue',
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0x24: 'door_yellow',
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0x25: 'door_green',
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0x26: ['key_red', '#next'],
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0x27: ['key_blue', '#next'],
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0x28: ['key_yellow', '#next'],
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0x29: ['key_green', '#next'],
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0x2a: ['chip', '#next'],
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0x2b: ['chip_extra', '#next'],
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0x2c: 'socket',
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0x2d: 'popwall',
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0x2e: 'wall_appearing',
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0x2f: 'wall_invisible',
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0x30: 'fake_wall',
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0x31: 'fake_floor',
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0x32: 'dirt',
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0x33: ['bug', '#direction', '#next'],
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0x34: ['paramecium', '#direction', '#next'],
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0x35: ['ball', '#direction', '#next'],
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0x36: ['blob', '#direction', '#next'],
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0x37: ['teeth', '#direction', '#next'],
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0x38: ['fireball', '#direction', '#next'],
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0x39: 'button_red',
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0x3a: 'button_brown',
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0x3b: ['cleats', '#next'],
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0x3c: ['suction_boots', '#next'],
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0x3d: ['fire_boots', '#next'],
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0x3e: ['flippers', '#next'],
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0x3f: 'thief_tools',
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0x40: ['bomb', '#next'],
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//0x41: Open trap (unused in main levels) :
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0x42: 'trap',
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0x43: 'cloner',
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//0x44: Clone machine : Modifier required, see below
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0x45: 'hint',
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//0x46: 'force_floor_all',
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// 0x47: 'button_gray',
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0x48: ['swivel_sw', 'swivel_floor'],
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0x49: ['swivel_nw', 'swivel_floor'],
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0x4a: ['swivel_ne', 'swivel_floor'],
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0x4b: ['swivel_se', 'swivel_floor'],
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// 0x4c: Time bonus : '#next'
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// 0x4d: Stopwatch : '#next'
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// 0x4e: Transmogrifier :
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// 0x4f: Railroad track (Modifier required, see section below) :
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// 0x50: Steel wall :
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// 0x51: Time bomb : '#next'
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// 0x52: Helmet : '#next'
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// 0x56: Melinda : '#direction', '#next'
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// 0x57: Timid teeth : '#direction', '#next'
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// 0x58: Explosion animation (unused in main levels) : '#direction', '#next'
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// 0x59: Hiking boots : '#next'
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// 0x5a: Male-only sign :
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// 0x5b: Female-only sign :
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// 0x5c: Inverter gate (N) : Modifier allows other gates, see below
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// 0x5e: Logic switch (ON) :
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// 0x5f: Flame jet (OFF) :
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// 0x60: Flame jet (ON) :
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// 0x61: Orange button :
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// 0x62: Lightning bolt : '#next'
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// 0x63: Yellow tank : '#direction', '#next'
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// 0x64: Yellow tank button :
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// 0x65: Mirror Chip : '#direction', '#next'
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// 0x66: Mirror Melinda : '#direction', '#next'
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// 0x68: Bowling ball : '#next'
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// 0x69: Rover : '#direction', '#next'
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// 0x6a: Time penalty : '#next'
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0x6b: ['#mod8?', ['floor_custom_green', 'floor_custom_pink', 'floor_custom_yellow', 'floor_custom_blue']],
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0x6d: ['#thinwall/canopy', '#next'],
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// 0x6f: Railroad sign : '#next'
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0x70: ['#mod8?', ['wall_custom_green', 'wall_custom_pink', 'wall_custom_yellow', 'wall_custom_blue']],
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0x71: ['#mod8', 'floor_letter'],
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// 0x72: Purple toggle wall :
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// 0x73: Purple toggle floor :
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0x76: ['#mod8', '#next'],
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// 0x77: 16-bit Modifier (see Modifier section below) : 2 modifier bytes, Tile Specification for affected tile
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// 0x78: 32-bit Modifier (see Modifier section below) : 4 modifier bytes, Tile Specification for affected tile
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0x7a: ['score_10', '#next'],
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0x7b: ['score_100', '#next'],
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0x7c: ['score_1000', '#next'],
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// 0x7d: Solid green wall :
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// 0x7e: False green wall :
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0x7f: ['forbidden', '#next'],
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0x80: ['score_2x', '#next'],
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// 0x81: Directional block : '#direction', Directional Arrows Bitmask, '#next'
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// 0x82: Floor mimic : '#direction', '#next'
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0x83: ['green_bomb', '#next'],
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0x84: ['green_chip', '#next'],
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// 0x87: Black button :
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// 0x88: ON/OFF switch (OFF) :
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// 0x89: ON/OFF switch (ON) :
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0x8a: 'thief_keys',
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// 0x8b: Ghost : '#direction', '#next'
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// 0x8c: Steel foil : '#next'
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0x8d: 'turtle',
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// 0x8e: Secret eye : '#next'
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// 0x8f: Thief bribe : '#next'
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// 0x90: Speed boots : '#next'
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// 0x92: Hook : '#next'
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};
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// Decompress the little ad-hoc compression scheme used for both map data and
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// solution playback
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function decompress(buf) {
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let decompressed_length = new DataView(buf).getUint16(0, true);
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let out = new ArrayBuffer(decompressed_length);
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let outbytes = new Uint8Array(out);
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let bytes = new Uint8Array(buf);
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let p = 2;
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let q = 0;
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while (p < buf.byteLength) {
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let len = bytes[p];
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p++;
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if (len < 0x80) {
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// Data block
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outbytes.set(new Uint8Array(buf.slice(p, p + len)), q);
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p += len;
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q += len;
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}
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else {
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// Back-reference block
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len -= 0x80;
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let offset = bytes[p];
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p++;
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// Can't use set + slice here because the copy can overlap and that
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// doesn't work so great, so just do a regular loop and let the JIT
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// deal with it
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let start = q - offset;
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for (let i = 0; i < len; i++) {
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outbytes[q] = outbytes[start + i];
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q++;
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}
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}
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}
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if (q !== decompressed_length)
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throw new Error(`Expected to decode ${decompressed_length} bytes but got ${q} instead`);
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return out;
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}
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export function parse_level(buf) {
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let level = new util.StoredLevel;
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let full_view = new DataView(buf);
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let next_section_start = 0;
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let extra_hints;
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let hint_tiles = [];
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while (next_section_start < buf.byteLength) {
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// Read section header and length
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let section_start = next_section_start;
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let section_type = util.string_from_buffer_ascii(buf.slice(section_start, section_start + 4));
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let section_length = full_view.getUint32(section_start + 4, true);
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next_section_start = section_start + 8 + section_length;
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if (next_section_start > buf.byteLength)
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throw new Error(`Section at byte ${section_start} of type '${section_type}' extends ${buf.length - next_section_start} bytes past the end of the file`);
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// This chunk marks the end of the file regardless
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if (section_type === 'END ')
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break;
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if (section_type === 'CC2M' || section_type === 'LOCK' || section_type === 'VERS' ||
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section_type === 'TITL' || section_type === 'AUTH' ||
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section_type === 'CLUE' || section_type === 'NOTE')
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{
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// These are all singular strings (with a terminating NUL, for some reason)
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// XXX character encoding??
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let str = util.string_from_buffer_ascii(buf.slice(section_start + 8, next_section_start - 1)).replace(/\r\n/g, "\n");
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// TODO store more of this, at least for idempotence, maybe
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if (section_type === 'CC2M') {
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// File version, doesn't seem interesting
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}
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else if (section_type === 'LOCK') {
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// Unclear, seems to be a comment about the editor...?
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}
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else if (section_type === 'VERS') {
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// Editor version which created this level
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}
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else if (section_type === 'TITL') {
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// Level title
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level.title = str;
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}
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else if (section_type === 'AUTH') {
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// Author's name
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level.author = str;
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}
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else if (section_type === 'CLUE') {
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// Level hint
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level.hint = str;
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}
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else if (section_type === 'NOTE') {
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// Author's comments... but might also include multiple hints
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// for levels with multiple hint tiles, delineated by [CLUE].
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// For my purposes, extra hints are associated with the
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// individual tiles, so we'll map those later
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[level.comment, ...extra_hints] = str.split(/^\[CLUE\]$/mg);
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}
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continue;
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}
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let section_buf = buf.slice(section_start + 8, next_section_start);
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let section_view = new DataView(buf, section_start + 8, section_length);
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if (section_type === 'OPTN') {
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// Level options, which may be truncated at any point
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// TODO implement most of these
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level.time_limit = section_view.getUint16(0, true);
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// TODO 0 - 10x10, 1 - 9x9, 2 - split, otherwise unknown which needs handling
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let viewport = section_view.getUint8(2, true);
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if (viewport === 0) {
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level.viewport_size = 10;
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}
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else if (viewport === 1) {
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level.viewport_size = 9;
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}
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else if (viewport === 2) {
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// FIXME this is split
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level.viewport_size = 10;
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}
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else {
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throw new Error(`Unrecognized viewport size option ${viewport}`);
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}
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if (section_view.byteLength <= 3)
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continue;
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//options.has_solution = section_view.getUint8(3, true);
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if (section_view.byteLength <= 4)
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continue;
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//options.show_map_in_editor = section_view.getUint8(4, true);
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if (section_view.byteLength <= 5)
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continue;
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//options.is_editable = section_view.getUint8(5, true);
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if (section_view.byteLength <= 6)
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continue;
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//options.solution_hash = util.string_from_buffer_ascii(buf.slice(
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//section_start + 6, section_start + 22));
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if (section_view.byteLength <= 22)
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continue;
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//options.hide_logic = section_view.getUint8(22, true);
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if (section_view.byteLength <= 23)
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continue;
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level.use_cc1_boots = section_view.getUint8(23, true);
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if (section_view.byteLength <= 24)
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continue;
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//level.blob_behavior = section_view.getUint8(24, true);
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}
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else if (section_type === 'MAP ' || section_type === 'PACK') {
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let data = section_buf;
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if (section_type === 'PACK') {
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data = decompress(data);
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}
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let bytes = new Uint8Array(data);
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let width = bytes[0];
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let height = bytes[1];
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level.size_x = width;
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level.size_y = height;
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let p = 2;
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function read_spec() {
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let tile_byte = bytes[p];
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p++;
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if (tile_byte >= 0x77 && tile_byte <= 0x78) {
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// XXX handle these modifier "tiles"
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p += tile_byte - 0x75;
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return [];
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}
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let spec = TILE_ENCODING[tile_byte];
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if (! spec)
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throw new Error(`Unrecognized tile type 0x${tile_byte.toString(16)}`);
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let name;
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let args = [];
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if (spec instanceof Array) {
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return spec;
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}
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else {
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return [spec];
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}
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}
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for (let n = 0; n < width * height; n++) {
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let cell = new util.StoredCell;
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while (true) {
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let [name, ...args] = read_spec();
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if (name === undefined) continue; // XXX modifier skip hack
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// Deal with modifiers
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let modifier;
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if (name === '#mod8') {
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if (args[0] !== '#next')
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throw new Error(`Tile requires a preceding modifier`);
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modifier = bytes[p];
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p++;
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let mod_marker;
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[mod_marker, name, ...args] = read_spec();
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if (mod_marker !== '#mod8' && mod_marker !== '#mod8?')
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throw new Error(`Expected a tile requiring a modifier`);
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}
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else if (name === '#mod8?') {
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// This is optional, so if we didn't get one, the modifier is 0
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modifier = 0;
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[name, ...args] = args;
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}
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// Make a tile template, possibly dealing with some special cases
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if (name === '#thinwall/canopy') {
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// Thin walls and the canopy are combined into a single
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// byte for some reason; split them apart here. Which
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// ones we get is determined by a bitmask
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let mask = bytes[p];
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p++;
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// This order is important; this is the order CC2 draws them in
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if (mask & 0x10) {
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cell.push({name: 'canopy'});
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}
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if (mask & 0x08) {
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cell.push({name: 'thinwall_w'});
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}
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if (mask & 0x04) {
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cell.push({name: 'thinwall_s'});
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}
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if (mask & 0x02) {
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cell.push({name: 'thinwall_e'});
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}
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if (mask & 0x01) {
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cell.push({name: 'thinwall_n'});
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}
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// Skip the rest of the loop. That means we don't
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// handle any of the other special behavior below, but
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// neither thin walls nor canopies should use any of
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// it, so that's fine
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continue;
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}
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else if (name instanceof Array) {
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// Custom floors and walls are one of several options,
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// given by an optional modifier
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name = name[modifier];
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}
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let tile = {name, modifier};
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cell.push(tile);
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let type = TILE_TYPES[name];
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if (!type) console.error(name);
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if (type.is_required_chip) {
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level.chips_required++;
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}
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if (type.is_hint) {
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// Remember all the hint tiles (in reading order) so we
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// can map extra hints to them later. Don't do it now,
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// since the format doesn't technically guarantee that
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// the metadata sections appear before the map data!
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hint_tiles.push(tile);
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}
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// Handle extra arguments
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let has_next = false;
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for (let arg of args) {
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if (arg === '#direction') {
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let dirbyte = bytes[p];
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p++;
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let direction = ['north', 'east', 'south', 'west'][dirbyte];
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if (! direction) {
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console.warn(`'${name}' tile at ${n % width}, ${Math.floor(n / width)} has bogus direction byte ${dirbyte}; defaulting to south`);
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direction = 'south';
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}
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tile.direction = direction;
|
|
}
|
|
else if (arg === '#next') {
|
|
has_next = true;
|
|
}
|
|
else {
|
|
// Anything else is an implicit next tile, e.g.
|
|
// turtles imply water underneath
|
|
cell.push({name: arg});
|
|
}
|
|
}
|
|
|
|
if (! has_next)
|
|
break;
|
|
}
|
|
cell.reverse();
|
|
level.linear_cells.push(cell);
|
|
}
|
|
}
|
|
else if (section_type === 'KEY ') {
|
|
}
|
|
else if (section_type === 'REPL' || section_type === 'PRPL') {
|
|
// "Replay", i.e. demo solution
|
|
let data = section_buf;
|
|
if (section_type === 'PRPL') {
|
|
data = decompress(data);
|
|
}
|
|
level.demo = new CC2Demo(data);
|
|
}
|
|
else if (section_type === 'RDNY') {
|
|
}
|
|
else if (section_type === 'END ') {
|
|
}
|
|
else {
|
|
console.warn(`Unrecognized section type '${section_type}' at offset ${section_start}`);
|
|
// TODO save it, persist when editing level
|
|
}
|
|
}
|
|
|
|
// Connect extra hints
|
|
let h = 0;
|
|
for (let tile of hint_tiles) {
|
|
if (h > extra_hints.length)
|
|
break;
|
|
|
|
tile.specific_hint = extra_hints[h];
|
|
h++;
|
|
}
|
|
|
|
return level;
|
|
}
|