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cassowary_ext.js
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cassowary_ext.js
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module('users.timfelgentreff.babelsberg.cassowary_ext').
requires('users.timfelgentreff.cassowary.DwarfCassowary').toRun(function() {
ClSimplexSolver.addMethods({
isConstraintObject: true,
constraintVariableFor: function(value, ivarname) {
if ((typeof(value) == 'number') ||
(value === null) ||
(value instanceof Number)) {
var v = new ClVariable(value + 0 /* coerce back into primitive */);
v.solver = this;
v.stay();
return v;
} else {
return null;
}
},
get strength() {
return ClStrength;
},
weight: 1000,
always: function(opts, func) {
var ctx = opts.ctx,
priority = this.strength[opts.priority];
func.varMapping = ctx;
var constraint = new Constraint(func, this);
constraint.priority = priority;
return constraint;
},
solverName: 'Cassowary',
supportsMethods: function() { return false; },
supportsSoftConstraints: function() { return true; },
supportsFiniteDomains: function() { return false; },
supportedDataTypes: function() {
// Cassowary does not support strings, but there are actively used scenarios
// where js-coercion from string to float is used - these cases would be blown
return ['number', 'string']; /* XXX: is this correct? */
}
});
Object.extend(ClSimplexSolver, {
getInstance: function() {
if (!this['$$instance']) {
this['$$instance'] = new ClSimplexSolver();
this['$$instance'].setAutosolve(false);
}
return this['$$instance'];
},
resetInstance: function() {
this['$$instance'] = undefined;
}
});
ClAbstractVariable.addMethods({
isConstraintObject: true,
stay: function(strength) {
if (!(strength instanceof ClStrength)) {
strength = this.solver.strength[strength];
}
if (this.stayConstraint) {
this.solver.removeConstraint(this.stayConstraint);
}
var cn = new ClStayConstraint(this, strength || ClStrength.weak, 1.0);
this.solver.addConstraint(cn);
this.stayConstraint = cn;
return cn;
},
removeStay: function() {
if (this.stayConstraint) {
try {
this.solver.removeConstraint(this.stayConstraint);
} catch (_) {
this.stayConstraint = null;
}
}
},
suggestValue: function(value) {
var c = this.cnEquals(value),
s = this.solver;
// uncomment this to make assignments be strong rather than required
// c.changeStrength(ClStrength.strong);
s.addConstraint(c);
try {
s.solve();
} finally {
s.removeConstraint(c);
}
},
setReadonly: function(bool) {
if (bool && !this.readonlyConstraint) {
var cn = new ClStayConstraint(this, ClStrength.required, 1.0);
this.solver.addConstraint(cn);
this.readonlyConstraint = cn;
return cn;
} else if (!bool && this.readonlyConstraint) {
this.solver.removeConstraint(this.readonlyConstraint);
this.readonlyConstraint = undefined;
}
},
isReadonly: function() {
return !!this.readonlyConstraint;
},
plus: function(value) {
return new ClLinearExpression(this).plus(value);
},
minus: function(value) {
return (new ClLinearExpression(this)).minus(value);
},
times: function(value) {
return new ClLinearExpression(this).times(value);
},
divide: function(value) {
return new ClLinearExpression(this).divide(value);
},
cnGeq: function(value) {
return new ClLinearExpression(this).cnGeq(value);
},
cnLeq: function(value) {
return new ClLinearExpression(this).cnLeq(value);
},
cnOr: function(value) {
return this;
},
cnEquals: function(value) {
return new ClLinearExpression(this).cnEquals(value);
},
cnIdentical: function(value) {
return this.cnEquals(value); // the same for numbers
},
prepareEdit: function() {
this.solver.addEditVar(this);
},
finishEdit: function() {
// do nothing
}
});
ClLinearExpression.addMethods({
isConstraintObject: true,
cnGeq: function(value) {
if (typeof(value) == 'string') {
// XXX: Basically, we make numbers in strings readonly here
value = parseFloat(value);
}
return new ClLinearInequality(this.minus(value));
},
cnLeq: function(value) {
if (typeof(value) == 'string') {
// XXX: Basically, we make numbers in strings readonly here
value = parseFloat(value);
}
if (!(value instanceof ClLinearExpression)) {
value = new ClLinearExpression(value);
}
if (!value.minus) debugger;
return new ClLinearInequality(value.minus(this));
},
cnOr: function(other) {
return this;
},
cnEquals: function(value) {
if (typeof(value) == 'string') {
// XXX: Basically, we make numbers in strings readonly here
value = parseFloat(value);
}
return new ClLinearEquation(this, value);
},
plus: function(expr /*ClLinearExpression*/) {
if (typeof(expr) == 'string') {
// XXX: Basically, we make numbers in strings readonly here
expr = parseFloat(expr);
}
if (expr instanceof ClLinearExpression) {
return this.clone().addExpression(expr, 1.0);
} else if (expr instanceof ClVariable) {
return this.clone().addVariable(expr, 1.0);
} else if (typeof(expr) == 'number') {
return this.clone().addExpression(new ClLinearExpression(expr), 1.0);
} else {
throw 'Not supported: plus with ' + expr;
}
},
times: function(x) {
if (typeof(x) == 'string') {
// XXX: Basically, we make numbers in strings readonly here
x = parseFloat(x);
}
if (typeof(x) == 'number') {
return (this.clone()).multiplyMe(x);
} else {
if (this.isConstant()) {
return x.times(this._constant);
} else if (x.isConstant()) {
return this.times(x._constant);
} else {
throw new ExCLNonlinearExpression();
}
}
},
minus: function(expr /*ClLinearExpression*/) {
if (typeof(expr) == 'string') {
// XXX: Basically, we make numbers in strings readonly here
expr = parseFloat(expr);
}
if (expr instanceof ClLinearExpression) {
return this.clone().addExpression(expr, -1.0);
} else if (expr instanceof ClVariable) {
return this.clone().addVariable(expr, -1.0);
} else if (typeof(expr) == 'number') {
return this.clone().addExpression(new ClLinearExpression(expr), -1.0);
} else {
throw 'Not supported: minus with ' + expr;
}
},
divide: function(x) {
if (typeof(x) == 'string') {
// XXX: Basically, we make numbers in strings readonly here
x = parseFloat(x);
}
if (typeof(x) == 'number') {
if (CL.approx(x, 0.0)) {
throw new ExCLNonlinearExpression();
}
return this.times(1.0 / x);
} else if (x instanceof ClLinearExpression) {
if (!x.isConstant) {
throw new ExCLNonlinearExpression();
}
return this.times(1.0 / x._constant);
} else {
throw 'Not supported: divide with ' + expr;
}
}
});
ClConstraint.addMethods({
isConstraintObject: true,
enable: function(strength) {
if (strength) {
this.setStrength(strength);
}
this.solver.addConstraint(this);
},
disable: function() {
this.solver.removeConstraint(this);
},
cnOr: function(other) {
return this;
},
get solver() {
return this._solver || ClSimplexSolver.getInstance();
},
set solver(value) {
this._solver = value;
}
});
}); // end of module