The Tor Browser: js/src/tests/js1_8/genexps/regress-380237-01.js@6474c204b198 (annotated)

js/src/tests/js1_8/genexps/regress-380237-01.js@6474c204b198 (annotated)

js/src/tests/js1_8/genexps/regress-380237-01.js

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 //-----------------------------------------------------------------------------
 var BUGNUMBER = 380237;
 var summary = 'Generator expressions - sudoku';
 var actual = '';
 var expect = '';
 //-----------------------------------------------------------------------------
 test();
 //-----------------------------------------------------------------------------
 function test()
 {
   enterFunc ('test');
   printBugNumber(BUGNUMBER);
   printStatus (summary);
 if (this.version) version(180);
 // XXX should be standard (and named clone, after Java?)
 Object.prototype.copy = function () {
     let o = {}
     for (let i in this)
         o[i] = this[i]
     return o
 }
 // Make arrays and strings act more like Python lists by iterating their values, not their keys.
 Array.prototype.__iterator__ = String.prototype.__iterator__ = function () {
     for (let i = 0; i < this.length; i++)
         yield this[i]
 }
 // Containment testing for arrays and strings that should be coherent with their __iterator__.
 Array.prototype.contains = String.prototype.contains = function (e) {
     return this.indexOf(e) != -1
 }
 Array.prototype.repeat = String.prototype.repeat = function (n) {
     let s = this.constructor()
     for (let i = 0; i < n; i++)
         s = s.concat(this)
     return s
 }
 String.prototype.center = function (w) {
     let n = this.length
     if (w <= n)
         return this
     let m = Math.floor((w - n) / 2)
     return ' '.repeat(m) + this + ' '.repeat(w - n - m)
 }
 Array.prototype.toString = Array.prototype.toSource
 Object.prototype.toString = Object.prototype.toSource
 // XXX thought spurred by the next two functions: array extras should default to identity function
 function all(seq) {
     for (let e in seq)
         if (!e)
             return false
     return true
 }
 function some(seq) {
     for (let e in seq)
         if (e)
             return e
     return false
 }
 function cross(A, B) {
     return [a+b for (a in A) for (b in B)]
 }
 function dict(A) {
     let d = {}
     for (let e in A)
         d[e[0]] = e[1]
     return d
 }
 function set(A) {
     let s = []
     for (let e in A)
         if (!s.contains(e))
             s.push(e)
     return s
 }
 function zip(A, B) {
     let z = []
     let n = Math.min(A.length, B.length)
     for (let i = 0; i < n; i++)
         z.push([A[i], B[i]])
     return z
 }
 rows = 'ABCDEFGHI'
 cols = '123456789'
 digits   = '123456789'
 squares  = cross(rows, cols)
 unitlist = [cross(rows, c) for (c in cols)]
            .concat([cross(r, cols) for (r in rows)])
            .concat([cross(rs, cs) for (rs in ['ABC','DEF','GHI']) for (cs in ['123','456','789'])])
 units = dict([s, [u for (u in unitlist) if (u.contains(s))]]
              for (s in squares))
 peers = dict([s, set([s2 for (u in units[s]) for (s2 in u) if (s2 != s)])]
              for (s in squares))
 // Given a string of 81 digits (or . or 0 or -), return a dict of {cell:values}.
 function parse_grid(grid) {
     grid = [c for (c in grid) if ('0.-123456789'.contains(c))]
     let values = dict([s, digits] for (s in squares))
     for (let [s, d] in zip(squares, grid))
         if (digits.contains(d) && !assign(values, s, d))
             return false
     return values
 }
 // Eliminate all the other values (except d) from values[s] and propagate.
 function assign(values, s, d) {
     if (all(eliminate(values, s, d2) for (d2 in values[s]) if (d2 != d)))
         return values
     return false
 }
 // Eliminate d from values[s]; propagate when values or places <= 2.
 function eliminate(values, s, d) {
     if (!values[s].contains(d))
         return values // Already eliminated
     values[s] = values[s].replace(d, '')
     if (values[s].length == 0)
 	return false  // Contradiction: removed last value
     if (values[s].length == 1) {
 	// If there is only one value (d2) left in square, remove it from peers
         let d2 = values[s][0]
         if (!all(eliminate(values, s2, d2) for (s2 in peers[s])))
             return false
     }
     // Now check the places where d appears in the units of s
     for (let u in units[s]) {
 	let dplaces = [s for (s in u) if (values[s].contains(d))]
 	if (dplaces.length == 0)
 	    return false
 	if (dplaces.length == 1)
 	    // d can only be in one place in unit; assign it there
             if (!assign(values, dplaces[0], d))
                 return false
     }
     return values
 }
 // Used for debugging.
 function print_board(values) {
     let width = 1 + Math.max.apply(Math, [values[s].length for (s in squares)])
     let line = '\n' + ['-'.repeat(width*3)].repeat(3).join('+')
     for (let r in rows)
         print([values[r+c].center(width) + ('36'.contains(c) && '|' || '')
                for (c in cols)].join('') + ('CF'.contains(r) && line || ''))
     print('\n')
 }
 easy = "..3.2.6..9..3.5..1..18.64....81.29..7.......8..67.82....26.95..8..2.3..9..5.1.3.."
 print_board(parse_grid(easy))
 // Using depth-first search and constraint propagation, try all possible values.
 function search(values) {
     if (!values)
         return false    // Failed earlier
     if (all(values[s].length == 1 for (s in squares)))
         return values   // Solved!
     // Choose the unfilled square s with the fewest possibilities
     // XXX Math.min etc. should work with generator expressions and other iterators
     // XXX Math.min etc. should work on arrays (lists or tuples in Python) as well as numbers
     let a = [values[s].length + s for (s in squares) if (values[s].length > 1)].sort()
     let s = a[0].slice(-2)
     return some(search(assign(values.copy(), s, d)) for (d in values[s]))
 }
 hard = '4.....8.5.3..........7......2.....6.....8.4......1.......6.3.7.5..2.....1.4......'
 print_board(search(parse_grid(hard)))
   delete Object.prototype.copy;
   reportCompare(expect, actual, summary);
   exitFunc ('test');
 }