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finished up the CoffeeScript version of the Scope object

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Jeremy Ashkenas
2010-02-08 21:10:48 -05:00
parent 69808ba523
commit b8d22bc572
8 changed files with 244 additions and 143 deletions
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142
lib/coffee_script/scope.js
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@@ -1,50 +1,27 @@
(function(){
var dup;
var Scope, succ;
var __hasProp = Object.prototype.hasOwnProperty;
dup = function dup(input) {
var __a, __b, __c, key, output, val;
output = null;
if (input instanceof Array) {
output = [];
__a = input;
for (__b = 0; __b < __a.length; __b++) {
val = __a[__b];
output.push(val);
}
} else {
output = {
};
__c = input;
for (key in __c) {
val = __c[key];
if (__hasProp.call(__c, key)) {
output.key = val;
}
}
output;
}
return output;
};
// scope objects form a tree corresponding to the shape of the function
// Scope objects form a tree corresponding to the shape of the function
// definitions present in the script. They provide lexical scope, to determine
// whether a variable has been seen before or if it needs to be declared.
exports.Scope = function Scope(parent, expressions, func) {
//
// Initialize a scope with its parent, for lookups up the chain,
// as well as the Expressions body where it should declare its variables,
// and the function that it wraps.
Scope = (exports.Scope = function Scope(parent, expressions, method) {
var __a;
// Initialize a scope with its parent, for lookups up the chain,
// as well as the Expressions body where it should declare its variables,
// and the function that it wraps.
this.parent = parent;
this.expressions = expressions;
this.function = func;
this.method = method;
this.variables = {
};
__a = this.temp_variable = this.parent ? dup(this.parent.temp_variable) : '__a';
this.temp_variable = this.parent ? this.parent.temp_variable : '__a';
__a = this;
return Scope === this.constructor ? this : __a;
};
});
// Look up a variable in lexical scope, or declare it if not found.
exports.Scope.prototype.find = function find(name, rem) {
var found, remote;
remote = (typeof rem !== "undefined" && rem !== null) ? rem : false;
Scope.prototype.find = function find(name, remote) {
var found;
found = this.check(name);
if (found || remote) {
return found;
@@ -54,20 +31,99 @@
};
// Define a local variable as originating from a parameter in current scope
// -- no var required.
exports.Scope.prototype.parameter = function parameter(name) {
Scope.prototype.parameter = function parameter(name) {
return this.variables[name] = 'param';
};
// Just check to see if a variable has already been declared.
exports.Scope.prototype.check = function check(name) {
if ((typeof this.variables[name] !== "undefined" && this.variables[name] !== null)) {
Scope.prototype.check = function check(name) {
if (this.variables[name]) {
return true;
}
// TODO: what does that ruby !! mean..? need to follow up
// .. this next line is prolly wrong ..
return !!(this.parent && this.parent.check(name));
};
// You can reset a found variable on the immediate scope.
exports.Scope.prototype.reset = function reset(name) {
return this.variables[name] = undefined;
Scope.prototype.reset = function reset(name) {
return delete this.variables[name];
};
// Find an available, short, name for a compiler-generated variable.
Scope.prototype.free_variable = function free_variable() {
while (check(this.temp_variable)) {
((this.temp_variable = succ(this.temp_variable)));
}
this.variables[this.temp_variable] = 'var';
return this.temp_variable;
};
// Ensure that an assignment is made at the top of scope (or top-level
// scope, if requested).
Scope.prototype.assign = function assign(name, value, top_level) {
if (top_level && this.parent) {
return this.parent.assign(name, value, top_level);
}
return this.variables[name] = {
value: value,
assigned: true
};
};
// Does this scope reference any variables that need to be declared in the
// given function body?
Scope.prototype.has_declarations = function has_declarations(body) {
return body === this.expressions && this.declared_variables().length;
};
// Does this scope reference any assignments that need to be declared at the
// top of the given function body?
Scope.prototype.has_assignments = function has_assignments(body) {
return body === this.expressions && this.assigned_variables().length;
};
// Return the list of variables first declared in current scope.
Scope.prototype.declared_variables = function declared_variables() {
var __a, __b, key, val;
return ((function() {
__a = []; __b = this.variables;
for (key in __b) {
val = __b[key];
if (__hasProp.call(__b, key)) {
if (val === 'var') {
__a.push(key);
}
}
}
return __a;
}).call(this)).sort();
};
// Return the list of variables that are supposed to be assigned at the top
// of scope.
Scope.prototype.assigned_variables = function assigned_variables() {
var __a, __b, key, val;
return ((function() {
__a = []; __b = this.variables;
for (key in __b) {
val = __b[key];
if (__hasProp.call(__b, key)) {
if (val.assigned) {
__a.push([key, val.value]);
}
}
}
return __a;
}).call(this)).sort();
};
Scope.prototype.compiled_declarations = function compiled_declarations() {
return this.declared_variables().join(', ');
};
Scope.prototype.compiled_assignments = function compiled_assignments() {
var __a, __b, __c, t;
return ((function() {
__a = []; __b = this.assigned_variables();
for (__c = 0; __c < __b.length; __c++) {
t = __b[__c];
__a.push(t[0] + ' = ' + t[1]);
}
return __a;
}).call(this)).join(', ');
};
// Helper functions:
// The next character alphabetically, to produce the following string.
succ = function succ(str) {
return str.slice(0, str.length - 1) + String.fromCharCode(str.charCodeAt(str.length - 1) + 1);
};
})();