Mercurial > repos > tabletprog
view types.js @ 99:b58b19c455ec
Initial work on type system
author | Mike Pavone <pavone@retrodev.com> |
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date | Tue, 07 Aug 2012 23:29:21 -0700 |
parents | |
children | 9db0e3533b23 |
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function anytype() {}; anytype.prototype.satisfiedBy = function(type) { return true; }; anytype.prototype.str = function(indent) { if (indent === undefined) { indent = ''; } return indent + 'any\n'; }; anytype.prototype.id = 0; anytype.prototype.callable = true; anytype.prototype.replaceParams = function() { return this; }; var any = new anytype(); function typeparam(name, base) { this.name = name; this.base = base; this.callable = base.callable; } typeparam.prototype.replaceParams = function(paramtypes) { if (!(this.name in paramtypes)) { return this; } if (!this.base.satisfiedBy(paramtypes[this.name])) { throw new Error('param ' + this.name + ' has base type ' + this.base.str() + ' which is not satisfied by ' + paramtypes[this.name].str()); } return paramtypes[this.name]; }; typeparam.prototype.satisfiedBy = function(type) { return this.base.satisfiedBy(type); }; typeparam.prototype.str = function(indent) { return indent + 'param ' + this.name + '\n'; }; var nexttypeid = 1; function objecttype() { this.messages = {}; this.id = nexttypeid++; this.typeparams = []; this.satisfies_cache = {}; this.satisfies_cache[this.id] = true; } objecttype.prototype.callable = false; objecttype.prototype.addMessage = function(name, type) { this.messages[name] = type; }; objecttype.prototype.satisfiedBy = function(type) { if (type.id in this.satisfies_cache) { return this.satisfies_cache[type.id]; } if (type.lazyinit) { type.lazyinit(); } //temporarily set cache entry to true to prevent infinite recursion this.satisfies_cache[type.id] = true; var ret = true; if (type.messages === undefined) { ret = false; } if (ret) { for (var msgname in this.messages) { if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) { ret = false; break; } } } this.satisfies_cache[type.id] = ret; return ret; }; objecttype.prototype.str = function(indent) { if (indent === undefined) { indent = ''; } if (indent.length > 6) { return 'max depth reached\n'; } var newindent = indent + '\t'; var childindent = newindent + '\t' var ret = indent + 'objectype {\n'; for (var msgname in this.messages) { ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent) } return ret + indent + '}\n'; }; objecttype.prototype.replaceParams = function(paramtypes, visited) { if (visisted === undefined) { visited = {}; } if (this.id in visited) { return visited[this.id]; } var me = visited[this.id] = this.clone(); for (var msgname in this.messages) { me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited); } return me; }; objecttype.prototype.clone = function() { var clone = new objecttype(); for (var msgname in this.messages) { clone.messages[msgname] = this.messages[msgname]; } clone.typeparams = this.typeparams; return clone; }; function lambdatype() { this.id = nexttypeid++; this.messages = {}; this.params = []; this.paramlu = {}; this.typeparams = []; this.returntype = any; this.satisfies_cache = {}; this.satisfies_cache[this.id] = true; } lambdatype.prototype.callable = true; lambdatype.prototype.addParam = function(name) { this.paramlu[name] = this.params.length; this.params.push(any); }; lambdatype.prototype.paramType = function(name, type) { this.params[this.paramlu[name]] = type; }; lambdatype.prototype.addMessage = function(name, type) { this.messages[name] = type; }; lambdatype.prototype.satisfiedBy = function(type) { if (type.id in this.satisfies_cache) { return this.satisfies_cache[type.id]; } if (type.lazyinit) { type.lazyinit(); } //temporarily set cache entry to true to prevent infinite recursion this.satisfies_cache[type.id] = true; var ret = true; if (!(type.callable) || this.params.length != type.params.length) { ret = false; } if (ret) { for (var i in this.params) { if (i >= type.params.length || !this.params[i].satisfiedBy(type.params[i])) { ret = false; break; } } } if (ret) { for (var msgname in this.messages) { if (!(msgname in type.messages) || !this.messages[msgname].satisfiedBy(type.messages[msgname])) { ret = false; break; } } } ret = ret && this.returntype.satisfiedBy(type.returntype); this.satisfies_cache[type.id] = ret; return ret; } lambdatype.prototype.str = function(indent) { if (indent === undefined) { indent = ''; } if (indent.length > 6) { return 'max depth reached\n'; } var newindent = indent + '\t'; var childindent = newindent + '\t' var ret = indent + 'lambdatype {\n' + newindent + 'params: {\n'; for (var i = 0; i < this.params.length; i++) { ret += childindent + i + ':\n' + this.params[i].str(childindent + '\t'); } ret += newindent + '}\n' + newindent + 'returntype:\n' + this.returntype.str(childindent); for (var msgname in this.messages) { ret += newindent + msgname + ':\n' + this.messages[msgname].str(childindent) } return ret + indent + '}\n'; }; lambdatype.prototype.replaceParams = function(paramtypes, visited) { if (visisted === undefined) { visited = {}; } if (this.id in visited) { return visited[this.id]; } var me = visited[this.id] = this.clone(); for (var msgname in this.messages) { me.messages[msgname] = me.messages[msgname].replaceParams(paramtypes, visited); } return me; }; lambdatype.prototype.clone = function() { var clone = new lambdatype(); for (var msgname in this.messages) { clone.messages[msgname] = this.messages[msgname]; } clone.paramlu = this.paramlu; clone.params = this.params.slice(0, this.params.length); clone.returntype = this.returntype; clone.typeparams = this.typeparams; return clone; }; function uniontype(a, b) { this.a = a; this.b = b; this.id = nexttypeid++; this.satisfies_cache = null; } uniontype.prototype.lazyinit = function() { if (this.satisfies_cache = null) { this.satisfies_cache = {}; this.satisfies_cache[this.id] = true; this.messages = {}; if (a.messages !== undefined && b.messages !== undefined) { for (var msgname in a.messages) { if (msgname in b.messages) { this.messages[msgname] = mkunion(a.messages[msgname], b.messages[msgname]); } } } this.callable = false; if (a.callable && b.callable && a.params.length == b.params.length) { this.callable = true; this.params = []; for (var i = 0; i < a.params.length; i++) { this.params.push(mkunion(a.params[i], b.params[i])); } this.returntype = mkunion(a.returntype, b.returntype); } } }; uniontype.prototype.satisfiedBy = function(type) { this.lazyinit(); if (type.id in this.satisfies_cache) { return this.satisfies_cache[type.id]; } this.satisfies_cache[type.id] = true; var ret = this.a.satisfiedBy(type) || this.b.satisfiedBy(type); this.satisfies_cache[type.id] = ret; return ret; }; uniontype.prototype.str = function(indent) { if (indent === undefined) { indent = ''; } if (indent.length > 6) { return 'max depth reached\n'; } return indent + 'Union {\n\t' + indent + this.a.str() + '\t' + indent + this.b.str() + indent + '}\n'; }; uniontype.prototype.replaceParams = function(paramtypes, visited) { if (visisted === undefined) { visited = {}; } if (this.id in visited) { return visited[this.id]; } var me = visited[this.id] = this.clone(); me.a = me.a.replaceParams(paramtypes, visited); me.b = me.b.replaceParams(paramtypes, visited); return me; }; uniontype.prototype.clone = function() { return new uniontype(this.a, this.b); }; function mkunion(a, b) { //if b is a subtype of a, then a | b is equivalent to a if (a.satisfiedBy(b)) { return a; } //if a is a subtype of b, then a | b is equivalent to b if (b.satisfiedBy(a)) { return b; } return new uniontype(a, b); } function withtparams(type, params) { this.type = type; this.params = params; } withtparams.prototype.satisfiedBy = function(type) { return this.type.satisfiedBy(type); }; withtparams.prototype.str = function(indent) { return this.type.str(indent) + indent + '<' + this.params.map(function(p) { return p.str(indent); }).join(', ') + '>'; }; withtparams.prototype.replaceParams = function(paramtypes) { var replaced = false; for (var i in this.params) { var newp = this.params[i].replaceParams(paramtypes); if (newp != this.params[i]) { replaced = true; this.params[i] = newp; } } if (replaced) { var childptypes = {}; for (var i in this.type.typeparams) { childptypes[this.type.typeparams[i]] = this.params[i] } this.type = this.type.replaceParams(childptypes, {}); } return this; }; function typetest() { var foo = new objecttype(); var msgtype = new lambdatype(); msgtype.addParam('fo'); msgtype.returntype = foo; foo.addMessage('bar', msgtype); var baz = new objecttype(); var msgtype2 = new lambdatype(); msgtype2.addParam('fo'); msgtype2.paramType('fo', foo); msgtype2.returntype = baz; baz.addMessage('bar', msgtype2); baz.addMessage('qux', msgtype); var shizzle = new objecttype(); shizzle.addMessage('bar', msgtype); shizzle.addMessage('boo', msgtype); return {foo: foo, baz: baz, shizzle: shizzle}; } function paramtypetest() { var empty = new objecttype(); var tlnode = new objecttype(); tlnode.typeparams = ['T']; var t = new typeparam('T', any); var q = new typeparam('Q', any); var head = new lambdatype(); head.returnType = t; tlnode.addMessage('head', head); var tail = new lambdatype(); var econs = new lambdatype(); econs.addParam('val'); econs.typeparams = ['Q']; econs.paramType('val', q); econs.returntype = new withtparams(tlnode, [q]); empty.addMessage('cons', econs); tail.returntype = new uniontype(new withtparams(tlnode, [t]), empty); tlnode.addMessage('tail', tail); var cons = new lambdatype(); cons.addParam('val'); cons.paramType('val', t); cons.returntype = new withtparams(tlnode, [t]); tlnode.addMessage('cons', cons); return {empty: empty, tlnode: tlnode}; }