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Added generator for custom free variable types, e.g., '_cache',

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'_cache2', and so on.
This commit is contained in:
Stan Angeloff 2010-09-19 14:55:19 +03:00
parent 1f2c6c77fd
commit fe68261bc2
2 changed files with 31 additions and 13 deletions
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25
lib/scope.js
View file

@ -58,14 +58,25 @@
}
return !!(this.parent && this.parent.check(name));
};
Scope.prototype.freeVariable = function() {
var ordinal;
while (this.check(this.tempVars.general)) {
ordinal = 1 + parseInt(this.tempVars.general.substr(1), 36);
this.tempVars.general = '_' + ordinal.toString(36).replace(/\d/g, 'a');
Scope.prototype.freeVariable = function(type) {
var next;
if (type) {
next = function(prev) {
return '_' + type + ((prev && Number(prev.match(/\d+$/) || 1) + 1) || '');
};
} else {
type = 'general';
next = function(prev) {
var ordinal;
ordinal = 1 + parseInt(prev.substr(1), 36);
return '_' + ordinal.toString(36).replace(/\d/g, 'a');
};
}
this.variables[this.tempVars.general] = 'var';
return this.tempVars.general;
while (this.check(this.tempVars[type] || (this.tempVars[type] = next()))) {
this.tempVars[type] = next(this.tempVars[type]);
}
this.variables[this.tempVars[type]] = 'var';
return this.tempVars[type];
};
Scope.prototype.assign = function(name, value) {
return (this.variables[name] = {

19
src/scope.coffee
View file

@ -54,12 +54,19 @@ exports.Scope = class Scope
# If we need to store an intermediate result, find an available name for a
# compiler-generated variable. `_a`, `_b`, and so on...
freeVariable: ->
while @check @tempVars.general
ordinal = 1 + parseInt @tempVars.general.substr(1), 36
@tempVars.general = '_' + ordinal.toString(36).replace(/\d/g, 'a')
@variables[@tempVars.general] = 'var'
@tempVars.general
freeVariable: (type) ->
if type
next = (prev) ->
'_' + type + ((prev and Number(prev.match(/\d+$/) or 1) + 1) or '')
else
type = 'general'
next = (prev) ->
ordinal = 1 + parseInt prev.substr(1), 36
'_' + ordinal.toString(36).replace /\d/g, 'a'
while @check @tempVars[type] or= next()
@tempVars[type] = next @tempVars[type]
@variables[@tempVars[type]] = 'var'
@tempVars[type]
# Ensure that an assignment is made at the top of this scope
# (or at the top-level scope, if requested).