jashkenas--coffeescript/lib/scope.js

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(function() {
var Scope, extend, last, _ref;
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_ref = require('./helpers'), extend = _ref.extend, last = _ref.last;
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exports.Scope = Scope = (function() {
Scope.root = null;
function Scope(parent, expressions, method) {
this.parent = parent;
this.expressions = expressions;
this.method = method;
this.variables = [
{
name: 'arguments',
type: 'arguments'
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}
];
this.positions = {};
if (!this.parent) Scope.root = this;
}
Scope.prototype.add = function(name, type, immediate) {
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var pos;
if (this.shared && !immediate) return this.parent.add(name, type, immediate);
if (typeof (pos = this.positions[name]) === 'number') {
return this.variables[pos].type = type;
} else {
return this.positions[name] = this.variables.push({
name: name,
type: type
}) - 1;
}
};
Scope.prototype.find = function(name, options) {
if (this.check(name, options)) return true;
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this.add(name, 'var');
return false;
};
Scope.prototype.parameter = function(name) {
if (this.shared && this.parent.check(name, true)) return;
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return this.add(name, 'param');
};
Scope.prototype.check = function(name, immediate) {
var found, _ref2;
found = !!this.type(name);
if (found || immediate) return found;
return !!((_ref2 = this.parent) != null ? _ref2.check(name) : void 0);
};
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Scope.prototype.temporary = function(name, index) {
if (name.length > 1) {
return '_' + name + (index > 1 ? index : '');
} else {
return '_' + (index + parseInt(name, 36)).toString(36).replace(/\d/g, 'a');
}
};
Scope.prototype.type = function(name) {
var v, _i, _len, _ref2;
_ref2 = this.variables;
for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
v = _ref2[_i];
if (v.name === name) return v.type;
}
return null;
};
Scope.prototype.freeVariable = function(type) {
var index, temp;
index = 0;
while (this.check((temp = this.temporary(type, index)))) {
index++;
}
this.add(temp, 'var', true);
return temp;
};
Scope.prototype.assign = function(name, value) {
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this.add(name, {
value: value,
assigned: true
});
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return this.hasAssignments = true;
};
Scope.prototype.hasDeclarations = function() {
return !!this.declaredVariables().length;
};
Scope.prototype.declaredVariables = function() {
var realVars, tempVars, v, _i, _len, _ref2;
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realVars = [];
tempVars = [];
_ref2 = this.variables;
for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
v = _ref2[_i];
if (v.type === 'var') (v.name.charAt(0) === '_' ? tempVars : realVars).push(v.name);
}
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return realVars.sort().concat(tempVars.sort());
};
Scope.prototype.assignedVariables = function() {
var v, _i, _len, _ref2, _results;
_ref2 = this.variables;
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_results = [];
for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
v = _ref2[_i];
if (v.type.assigned) _results.push("" + v.name + " = " + v.type.value);
}
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return _results;
};
return Scope;
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})();
}).call(this);