var nthCheck = require(“./”),
assert = require("assert");
var invalid = [“-”, “asdf”, “2n+-0”, “2+0”, “- 1n”, “-1 n”];
function parseInvalid(){
invalid.forEach(function(formula){ assert.throws(function(){ nthCheck.parse(formula); }, SyntaxError, formula ); });
}
var valid = {
"1": [ 0, 1 ], "2": [ 0, 2 ], "3": [ 0, 3 ], "5": [ 0, 5 ], " 1 ": [ 0, 1 ], " 5 ": [ 0, 5 ], "+2n + 1": [ 2, 1 ], "-1": [ 0, -1 ], "-1n + 3": [ -1, 3 ], "-1n+3": [ -1, 3 ], "-n+2": [ -1, 2 ], "-n+3": [ -1, 3 ], "0n+3": [ 0, 3 ], "1n": [ 1, 0 ], "1n+0": [ 1, 0 ], "2n": [ 2, 0 ], "2n + 1": [ 2, 1 ], "2n+1": [ 2, 1 ], "3n": [ 3, 0 ], "3n+0": [ 3, 0 ], "3n+1": [ 3, 1 ], "3n+2": [ 3, 2 ], "3n+3": [ 3, 3 ], "3n-1": [ 3, -1 ], "3n-2": [ 3, -2 ], "3n-3": [ 3, -3 ], even: [ 2, 0 ], n: [ 1, 0 ], "n+2": [ 1, 2 ], odd: [ 2, 1 ], //surprisingly, neither sizzle, qwery or nwmatcher cover these cases "-4n+13": [-4, 13], "-2n + 12": [-2, 12]
};
function parseValid(){
Object.keys(valid).forEach(function(formula){ assert.deepEqual(nthCheck.parse(formula), valid[formula], formula); });
}
function testValid(){
Object.keys(valid).forEach(function(formula){ testFormula(valid[formula], formula); });
}
var valArray = Array.apply(null, Array(2e3)).map(function(_, i){return i;});
function testFormula(formula, name){
var filtered = valArray.filter(nthCheck.compile(formula)), iterated = stupidNth(formula); try { assert.deepEqual(filtered, iterated, name); } catch(e){ e.expected = JSON.stringify(iterated) + " " + name; e.actual = JSON.stringify(filtered) + " " + name; throw e; }
}
function stupidNth(formula, limit){
var a = formula[0], b = formula[1]; if(a === 0 && b > 0) return [b - 1]; //taken from qwery return valArray.filter(function(val){ for(var i = b, l = valArray.length; ((a > 0) ? (i <= l) : (i >= 1)); i += a){ if(val === valArray[i - 1]) return true; } });
}
process.stdout.write(“- parser”); process.stdout.write(“n - parse invalid:t”); parseInvalid(); process.stdout.write(“Xn - parse valid:t”); parseValid(); process.stdout.write(“Xn- check values: t”); testValid(); process.stdout.write(“Xn”);