diff options
Diffstat (limited to 'rules.js')
| -rw-r--r-- | rules.js | 153 |
1 files changed, 93 insertions, 60 deletions
@@ -53,6 +53,63 @@ function debug_hexes(n, list) { console.log("".padStart(y," ") + list.slice(y*hexw, (y+1)*hexw).map(x=>String(x).padStart(2, ' ')).join("")) } +// === CRC32 CHECKSUM === + +const CRC32C_TABLE = new Int32Array([ + 0x00000000, 0xf26b8303, 0xe13b70f7, 0x1350f3f4, 0xc79a971f, 0x35f1141c, 0x26a1e7e8, 0xd4ca64eb, + 0x8ad958cf, 0x78b2dbcc, 0x6be22838, 0x9989ab3b, 0x4d43cfd0, 0xbf284cd3, 0xac78bf27, 0x5e133c24, + 0x105ec76f, 0xe235446c, 0xf165b798, 0x030e349b, 0xd7c45070, 0x25afd373, 0x36ff2087, 0xc494a384, + 0x9a879fa0, 0x68ec1ca3, 0x7bbcef57, 0x89d76c54, 0x5d1d08bf, 0xaf768bbc, 0xbc267848, 0x4e4dfb4b, + 0x20bd8ede, 0xd2d60ddd, 0xc186fe29, 0x33ed7d2a, 0xe72719c1, 0x154c9ac2, 0x061c6936, 0xf477ea35, + 0xaa64d611, 0x580f5512, 0x4b5fa6e6, 0xb93425e5, 0x6dfe410e, 0x9f95c20d, 0x8cc531f9, 0x7eaeb2fa, + 0x30e349b1, 0xc288cab2, 0xd1d83946, 0x23b3ba45, 0xf779deae, 0x05125dad, 0x1642ae59, 0xe4292d5a, + 0xba3a117e, 0x4851927d, 0x5b016189, 0xa96ae28a, 0x7da08661, 0x8fcb0562, 0x9c9bf696, 0x6ef07595, + 0x417b1dbc, 0xb3109ebf, 0xa0406d4b, 0x522bee48, 0x86e18aa3, 0x748a09a0, 0x67dafa54, 0x95b17957, + 0xcba24573, 0x39c9c670, 0x2a993584, 0xd8f2b687, 0x0c38d26c, 0xfe53516f, 0xed03a29b, 0x1f682198, + 0x5125dad3, 0xa34e59d0, 0xb01eaa24, 0x42752927, 0x96bf4dcc, 0x64d4cecf, 0x77843d3b, 0x85efbe38, + 0xdbfc821c, 0x2997011f, 0x3ac7f2eb, 0xc8ac71e8, 0x1c661503, 0xee0d9600, 0xfd5d65f4, 0x0f36e6f7, + 0x61c69362, 0x93ad1061, 0x80fde395, 0x72966096, 0xa65c047d, 0x5437877e, 0x4767748a, 0xb50cf789, + 0xeb1fcbad, 0x197448ae, 0x0a24bb5a, 0xf84f3859, 0x2c855cb2, 0xdeeedfb1, 0xcdbe2c45, 0x3fd5af46, + 0x7198540d, 0x83f3d70e, 0x90a324fa, 0x62c8a7f9, 0xb602c312, 0x44694011, 0x5739b3e5, 0xa55230e6, + 0xfb410cc2, 0x092a8fc1, 0x1a7a7c35, 0xe811ff36, 0x3cdb9bdd, 0xceb018de, 0xdde0eb2a, 0x2f8b6829, + 0x82f63b78, 0x709db87b, 0x63cd4b8f, 0x91a6c88c, 0x456cac67, 0xb7072f64, 0xa457dc90, 0x563c5f93, + 0x082f63b7, 0xfa44e0b4, 0xe9141340, 0x1b7f9043, 0xcfb5f4a8, 0x3dde77ab, 0x2e8e845f, 0xdce5075c, + 0x92a8fc17, 0x60c37f14, 0x73938ce0, 0x81f80fe3, 0x55326b08, 0xa759e80b, 0xb4091bff, 0x466298fc, + 0x1871a4d8, 0xea1a27db, 0xf94ad42f, 0x0b21572c, 0xdfeb33c7, 0x2d80b0c4, 0x3ed04330, 0xccbbc033, + 0xa24bb5a6, 0x502036a5, 0x4370c551, 0xb11b4652, 0x65d122b9, 0x97baa1ba, 0x84ea524e, 0x7681d14d, + 0x2892ed69, 0xdaf96e6a, 0xc9a99d9e, 0x3bc21e9d, 0xef087a76, 0x1d63f975, 0x0e330a81, 0xfc588982, + 0xb21572c9, 0x407ef1ca, 0x532e023e, 0xa145813d, 0x758fe5d6, 0x87e466d5, 0x94b49521, 0x66df1622, + 0x38cc2a06, 0xcaa7a905, 0xd9f75af1, 0x2b9cd9f2, 0xff56bd19, 0x0d3d3e1a, 0x1e6dcdee, 0xec064eed, + 0xc38d26c4, 0x31e6a5c7, 0x22b65633, 0xd0ddd530, 0x0417b1db, 0xf67c32d8, 0xe52cc12c, 0x1747422f, + 0x49547e0b, 0xbb3ffd08, 0xa86f0efc, 0x5a048dff, 0x8ecee914, 0x7ca56a17, 0x6ff599e3, 0x9d9e1ae0, + 0xd3d3e1ab, 0x21b862a8, 0x32e8915c, 0xc083125f, 0x144976b4, 0xe622f5b7, 0xf5720643, 0x07198540, + 0x590ab964, 0xab613a67, 0xb831c993, 0x4a5a4a90, 0x9e902e7b, 0x6cfbad78, 0x7fab5e8c, 0x8dc0dd8f, + 0xe330a81a, 0x115b2b19, 0x020bd8ed, 0xf0605bee, 0x24aa3f05, 0xd6c1bc06, 0xc5914ff2, 0x37faccf1, + 0x69e9f0d5, 0x9b8273d6, 0x88d28022, 0x7ab90321, 0xae7367ca, 0x5c18e4c9, 0x4f48173d, 0xbd23943e, + 0xf36e6f75, 0x0105ec76, 0x12551f82, 0xe03e9c81, 0x34f4f86a, 0xc69f7b69, 0xd5cf889d, 0x27a40b9e, + 0x79b737ba, 0x8bdcb4b9, 0x988c474d, 0x6ae7c44e, 0xbe2da0a5, 0x4c4623a6, 0x5f16d052, 0xad7d5351 +]) + +// fast with unlikely collisions +function supply_memo_idx_crc32c(data, tail1, tail2) { + var x = 0 + for (var i = 0, n = data.length; i < n; ++i) + x = CRC32C_TABLE[(x ^ data[i]) & 0xff] ^ (x >>> 8) + x = CRC32C_TABLE[(x ^ tail1) & 0xff] ^ (x >>> 8) + x = CRC32C_TABLE[(x ^ tail2) & 0xff] ^ (x >>> 8) + return x +} + +// slow but guaranteed no collisions +function supply_memo_idx_slow(data, tail1, tail2) { + var x = 0n + for (var i = 0, n = data.length; i < n; ++i) + x = (x << 8n) | BigInt(data[i]) + x = (x << 8n) | BigInt(tail1) + x = (x << 8n) | BigInt(tail2) + return x +} + // === CONSTS === const AXIS = 'Axis' @@ -1142,7 +1199,7 @@ function shuffle_cards() { var supply_friendly_hexes, supply_friendly_sides, supply_friendly, supply_enemy, supply_net, supply_line var supply_visited = new Array(hexcount).fill(0) -var supply_memo = new Array(hexcount * 8 * 6).fill(0) +var supply_memo = new Set() // PASS 1: Forward scan from source to compute potential supply net and valid hex side crossings. // Simple uniform cost search. @@ -1256,7 +1313,7 @@ function trace_supply_network_1(start) supply_visited[next] = next_move if (supply_friendly[next] > 0 && !supply_net[next]) - search_order.unshift(next) + search_order.push(next) supply_net[next] = 1 @@ -1335,27 +1392,38 @@ function backward_supply_next_move_type(here_move, road) { return BACK_ABORT } -function trace_unit_supply_line(path, here, here_move, ssrc, from_dir) { - let memo_idx = here * 48 + here_move * 6 + from_dir - if (supply_memo[memo_idx]) { - for (let x of path) - supply_line[x] = 2 +function path_includes(list, x) { + for (var i = list.length - 1; i >= 0; --i) + if (list[i] === x) + return true + return false +} + +function trace_unit_supply_line(full_path, path, here, here_move, ssrc, from_dir) { + // CORRECT (but slow): let memo_idx = supply_memo_idx_slow(full_path, here, here_move * 6 + from_dir) + // CRC32-C we pray for no collisions! + let memo_idx = supply_memo_idx_crc32c(full_path, here, here_move * 6 + from_dir) + if (supply_memo.has(memo_idx)) { return true } - supply_visited[here] = 1 + path.push(here) + if (supply_friendly[here] > 1) + full_path.push(here) + let supplied = false for (let s = 0; s < 6; ++s) { let next = here + hexnext[s] - // can't go off-map if (next < first_hex || next > last_hex) continue // already seen - if (supply_visited[next]) + if (path_includes(full_path, next)) // supply chain - heads (can't loop back) + continue + if (path_includes(path, next)) // supply chain - intermediate links (can't double back from _same_ head) continue // not part of supply network (from pass 1) @@ -1371,43 +1439,10 @@ function trace_unit_supply_line(path, here, here_move, ssrc, from_dir) { if (next_move === TRACE_ABORT) continue - let reached = (next === ssrc) - if (!reached) { - // Sometimes we can stop searching if we reach a supplied highway. - if (hex_road[next] === HIGHWAY && supply_net[next] === 2) { - - // But only if we can't continue by trail or track. - // If we always stop we'll miss possible departures that reconnect - // to the highway elsewhere. - // - // Example: Tobruk - EL Adem - Sidi Rezegh - Ft. Capuzzo - - // Not enough movement left to leave highway: - if (next_move === BACK_HIGHWAY_3 || next_move === BACK_STOP) - reached = true - - // MAYBE WRONG - // (can we leave supplied highway to connect to chain elsewhere?) - // Only these places can reconnect to the highway using trail/track: - if ( - next !== 35 && // Gazala - next !== 55 && // Er Regima - next !== 61 && // Bir Harmat - next !== 62 && // El Adem - next !== 64 && // Ft. Capuzzo - next !== 65 && // Sollum - next !== 78 // Ghemines - ) - reached = true - } - } - // reached supply source - if (reached) { - for (let x of path) - supply_line[x] = 2 - supply_line[side] = 2 + if (next === ssrc) { supply_net[next] = 2 + supply_line[side] = 2 supplied = true continue } @@ -1420,16 +1455,19 @@ function trace_unit_supply_line(path, here, here_move, ssrc, from_dir) { if (next_move === BACK_STOP && hex_road[next] === HIGHWAY) next_move = BACK_HIGHWAY_3 - path.push(side) - if (trace_unit_supply_line(path, next, next_move, ssrc, s)) + if (trace_unit_supply_line(full_path, supply_friendly[next] > 1 ? [] : path, next, next_move, ssrc, s)) { + supply_line[side] = 2 supplied = true - path.pop() + } } - supply_visited[here] = 0 + + path.pop() + if (supply_friendly[here] > 1) + full_path.pop() if (supplied) { supply_net[here] = 2 - supply_memo[memo_idx] = 1 + supply_memo.add(memo_idx) } return supplied @@ -1462,12 +1500,10 @@ function trace_supply_network(start) { let search_order = trace_supply_network_1(start) // Pass 2: Filter hexes that have actual supply lines from units. - supply_visited.fill(0) - supply_memo.fill(0) - let path = [] + supply_memo.clear() for (let x of search_order) { if (supply_friendly[x] > 0 && x !== start) { - trace_unit_supply_line(path, x, BACK_HEAD, start, 0) + trace_unit_supply_line([], [], x, BACK_HEAD, start, 0) } } @@ -1489,15 +1525,12 @@ function trace_fortress_network(fortress, ss) { trace_supply_network_1(fortress) // Pass 2: Filter hexes that have actual supply lines from units. - supply_visited.fill(0) - supply_memo.fill(0) - let path = [] + supply_memo.clear() for (let u = 0; u < unit_count; ++u) { if (unit_supply(u) === ss) { let x = unit_hex(u) if (is_map_hex(x) && x !== fortress) { - //if (supply_friendly[x] > 1 && supply_net[x]) continue - trace_unit_supply_line(path, x, BACK_HEAD, fortress, 0) + trace_unit_supply_line([], [], x, BACK_HEAD, fortress, 0) } } } @@ -3161,7 +3194,7 @@ function save_withdrawal_supply_lines() { } } -// ==== MOVEMENT PHASE === +// === MOVEMENT PHASE === function push_move_summary(from, to, via, forced) { let mm = (from) | (to << 8) | (via << 16) | (forced << 24) |