data.js

const sura_length = [7,286,200,176,120,165,206,75,129,109,123,111,43,52,99,128,111,110,98,135,112,78,118,64,77,227,93,88,69,60,34,30,73,54,45,83,182,88,75,85,54,53,89,59,37,35,38,29,18,45,60,49,62,55,78,96,29,22,24,13,14,11,11,18,12,12,30,52,52,44,28,28,20,56,40,31,50,40,46,42,29,19,36,25,22,17,19,26,30,20,15,21,11,8,8,19,5,8,8,11,11,8,3,9,5,4,7,3,6,3,5,4,5,6]
const sura_name = [<<!!sed "s/^/'/;s/$/',/" res/suar-names | tr -d '\n' >>]
// both rubs and pages are based on http://tanzil.net/res/text/metadata/quran-data.js
// but changed from sura-aya pairs to aya indexes (0-6235)
const rubs = [
   0,  32,  50,  66,   81,  98, 112, 130,  // juz  1
 148, 164, 183, 195,  209, 225, 239, 249,  // juz  2
 259, 269, 278, 289,  307, 325, 344, 367,  // juz  3
 385, 405, 425, 445,  463, 478, 493, 504,  // juz  4
 516, 528, 550, 566,  580, 592, 606, 627,  // juz  5
 640, 655, 669, 680,  695, 709, 719, 735,  // juz  6
 750, 765, 777, 801,  824, 847, 862, 883,  // juz  7
 899, 915, 929, 939,  954, 984,1000,1018,  // juz  8
1041,1070,1095,1109, 1124,1142,1160,1181,  // juz  9
1200,1220,1235,1253, 1268,1280,1294,1309,  // juz 10
1327,1345,1356,1374, 1389,1416,1434,1453,  // juz 11
1478,1496,1513,1533, 1556,1580,1602,1625,  // juz 12
1648,1672,1696,1711, 1725,1741,1759,1777,  // juz 13
1802,1851,1901,1930, 1951,1975,1990,2011,  // juz 14
2029,2051,2078,2098, 2127,2156,2171,2190,  // juz 15
2214,2238,2271,2308, 2348,2402,2430,2458,  // juz 16
2483,2511,2533,2565, 2595,2613,2632,2654,  // juz 17
2673,2708,2747,2791, 2811,2825,2843,2855,  // juz 18
2875,2907,2932,2983, 3042,3112,3159,3185,  // juz 19
3214,3240,3263,3280, 3302,3327,3340,3365,  // juz 20
3385,3409,3439,3462, 3490,3513,3533,3550,  // juz 21
3563,3583,3592,3615, 3629,3651,3674,3700,  // juz 22
3732,3764,3809,3870, 3932,3990,4021,4065,  // juz 23
4089,4110,4133,4153, 4173,4198,4226,4242,  // juz 24
4264,4284,4298,4322, 4348,4381,4430,4484,  // juz 25
4510,4530,4554,4577, 4600,4612,4625,4656,  // juz 26
4705,4758,4809,4854, 4901,4979,5053,5090,  // juz 27
5104,5117,5136,5156, 5177,5191,5217,5229,  // juz 28
5241,5271,5323,5393, 5447,5494,5551,5609,  // juz 29
5672,5758,5829,5884, 5948,6023,6090,6154,  // juz 30
6236]
const pages = [0,7,12,23,31,36,44,55,64,68,76,83,90,95,100,108,112,119,126,133,141,148,152,160,170,176,183,188,193,197,203,209,217,222,226,231,237,240,244,252,255,259,263,266,271,276,281,288,289,293,302,308,315,322,330,338,345,354,363,370,376,384,393,401,408,414,425,433,441,446,450,458,466,473,479,487,493,499,504,507,512,516,519,526,530,537,544,552,558,567,572,579,584,587,594,598,606,614,620,627,633,640,647,655,663,668,671,674,678,682,686,692,700,705,710,714,719,726,733,739,745,751,758,764,772,777,782,789,797,807,816,824,833,841,848,857,862,870,879,883,890,899,907,913,920,926,931,935,940,946,954,965,976,984,991,997,1005,1011,1021,1027,1035,1041,1049,1058,1074,1084,1091,1097,1103,1109,1113,1117,1124,1132,1141,1149,1160,1168,1176,1185,1193,1200,1205,1212,1221,1229,1235,1241,1248,1255,1261,1266,1271,1275,1282,1289,1296,1303,1307,1314,1321,1328,1334,1341,1346,1352,1357,1364,1370,1378,1384,1389,1397,1406,1417,1425,1434,1442,1452,1461,1470,1478,1485,1492,1501,1510,1518,1526,1535,1544,1554,1561,1570,1581,1590,1600,1610,1618,1626,1633,1639,1648,1659,1665,1674,1682,1691,1699,1707,1712,1720,1725,1735,1741,1749,1755,1760,1768,1774,1783,1792,1802,1817,1833,1853,1872,1892,1907,1915,1927,1935,1943,1955,1965,1973,1980,1988,1994,2003,2011,2019,2029,2036,2046,2056,2067,2078,2087,2095,2104,2115,2125,2133,2144,2155,2160,2167,2174,2185,2193,2201,2214,2223,2237,2250,2261,2275,2288,2301,2314,2326,2345,2360,2385,2399,2412,2424,2435,2446,2461,2473,2483,2493,2507,2518,2527,2540,2555,2564,2573,2584,2595,2600,2610,2618,2625,2633,2641,2650,2659,2667,2673,2690,2700,2715,2732,2747,2762,2777,2791,2801,2811,2818,2822,2827,2834,2844,2849,2852,2857,2866,2875,2887,2898,2910,2922,2932,2951,2971,2992,3015,3043,3068,3091,3115,3138,3159,3172,3181,3194,3203,3214,3222,3235,3247,3257,3265,3273,3280,3287,3295,3302,3311,3322,3329,3336,3346,3354,3363,3370,3378,3385,3392,3403,3414,3424,3433,3441,3450,3459,3469,3480,3488,3497,3503,3514,3523,3533,3539,3548,3555,3563,3568,3576,3583,3587,3595,3606,3613,3620,3628,3637,3645,3654,3663,3671,3678,3690,3698,3704,3717,3732,3745,3759,3775,3788,3812,3839,3864,3890,3914,3941,3970,3986,3996,4012,4031,4053,4063,4068,4079,4089,4098,4105,4114,4125,4132,4140,4149,4158,4166,4173,4182,4191,4199,4210,4218,4229,4238,4247,4256,4264,4272,4282,4287,4294,4303,4316,4323,4335,4347,4358,4372,4385,4398,4414,4432,4453,4473,4486,4495,4505,4515,4524,4530,4538,4545,4556,4564,4574,4583,4592,4598,4606,4611,4616,4623,4630,4645,4665,4681,4705,4726,4749,4766,4784,4810,4828,4852,4873,4895,4917,4941,4968,4995,5029,5055,5078,5086,5093,5099,5104,5110,5115,5125,5129,5135,5142,5150,5155,5161,5168,5177,5185,5192,5199,5208,5217,5222,5229,5236,5241,5253,5267,5286,5313,5331,5357,5385,5414,5429,5447,5460,5475,5494,5512,5542,5570,5596,5616,5641,5672,5702,5727,5758,5800,5829,5854,5882,5909,5931,5963,5993,6016,6043,6072,6098,6125,6137,6155,6176,6193,6207,6221,6236]
// from tanzil metadata too, but in a more compact format
const rukus = [[1],[1,8,21,30,40,47,60,62,72,83,87,97,104,113,122,130,142,148,153,164,168,177,183,189,197,211,217,222,229,232,236,243,249,254,258,261,267,274,282,284],[1,10,21,31,42,55,64,72,81,92,102,110,121,130,144,149,156,172,181,190],[1,11,15,23,26,34,43,51,60,71,77,88,92,97,101,105,113,116,127,135,142,153,163,172],[1,6,12,20,27,35,44,51,57,67,78,87,94,101,109,116],[1,11,21,31,42,51,56,61,71,83,91,95,101,111,122,130,141,145,151,155],[1,11,26,32,40,48,54,59,65,73,85,94,100,109,127,130,142,148,152,158,163,172,182,189],[1,11,20,29,38,45,49,59,65,70],[1,7,17,25,30,38,43,60,67,73,81,90,100,111,119,123],[1,11,21,31,41,54,61,71,83,93,104],[1,9,25,36,50,61,69,84,96,110],[1,7,21,30,36,43,50,58,69,80,94,105],[1,8,19,27,32,38],[1,7,13,22,28,35,42],[1,16,26,45,61,80],[1,10,22,26,35,41,51,61,66,71,77,84,90,101,111,120],[1,11,23,31,41,53,61,71,78,85,94,101],[1,13,18,23,32,45,50,54,60,71,83,102],[1,16,41,51,66,83],[1,25,55,77,90,105,116,129],[1,11,30,42,51,76,94],[1,11,23,26,34,39,49,58,65,73],[1,23,33,51,78,93],[1,11,21,27,35,41,51,58,62],[1,10,21,35,45,61],[1,10,34,53,70,105,123,141,160,176,192],[1,15,32,45,59,67,83],[1,14,22,29,43,51,61,76],[1,14,23,31,45,52,64],[1,11,20,28,41,54],[1,12,20],[1,12,23],[1,9,21,28,35,41,53,59,69],[1,10,22,31,37,46],[1,8,15,27,38],[1,13,33,51,68],[1,22,75,114,139],[1,15,27,41,65],[1,10,22,32,42,53,64,71],[1,10,21,28,38,51,61,69,79],[1,9,19,26,33,45],[1,10,20,30,44],[1,16,26,36,46,57,68],[1,30,43],[1,12,22,27],[1,11,21,27],[1,12,20,29],[1,11,18,27],[1,11],[1,16,30],[1,24,47],[1,29],[1,26,33],[1,23,41],[1,26,46],[1,39,75],[1,11,20,26],[1,7,14],[1,11,18],[1,7],[1,10],[1,9],[1,9],[1,11],[1,8],[1,8],[1,15],[1,34],[1,38],[1,36],[1,21],[1,20],[1,20],[1,32],[1,31],[1,23],[1,41],[1,31],[1,27],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1],[1]]

function start_ (s) { return +sura_length.slice(0, s).reduce((a, b) => a + b, 0) }
const sura_offset = range(115).map(start_)  // array mapping 0-based suar to how many ayat before it (eg 0 => 0, 1 => 7, 2 => 286+7)
function sura_of (a) { return range(115).find((i) => sura_offset[i] >= a) }  // takes 1-based aaya ∈ [1-6236], returns its 1-based sura