angular2
Version:
Angular 2 - a web framework for modern web apps
182 lines • 8.38 kB
JavaScript
import { IS_DART, isBlank } from 'angular2/src/facade/lang';
import { codify, combineGeneratedStrings, rawString } from './codegen_facade';
import { RecordType } from './proto_record';
import { ChangeDetectionStrategy } from './constants';
import { BaseException } from 'angular2/src/facade/exceptions';
/**
* Class responsible for providing change detection logic for change detector classes.
*/
export class CodegenLogicUtil {
constructor(_names, _utilName, _changeDetectorStateName, _changeDetection) {
this._names = _names;
this._utilName = _utilName;
this._changeDetectorStateName = _changeDetectorStateName;
this._changeDetection = _changeDetection;
}
/**
* Generates a statement which updates the local variable representing `protoRec` with the current
* value of the record. Used by property bindings.
*/
genPropertyBindingEvalValue(protoRec) {
return this._genEvalValue(protoRec, idx => this._names.getLocalName(idx), this._names.getLocalsAccessorName());
}
/**
* Generates a statement which updates the local variable representing `protoRec` with the current
* value of the record. Used by event bindings.
*/
genEventBindingEvalValue(eventRecord, protoRec) {
return this._genEvalValue(protoRec, idx => this._names.getEventLocalName(eventRecord, idx), "locals");
}
_genEvalValue(protoRec, getLocalName, localsAccessor) {
var context = (protoRec.contextIndex == -1) ?
this._names.getDirectiveName(protoRec.directiveIndex) :
getLocalName(protoRec.contextIndex);
var argString = protoRec.args.map(arg => getLocalName(arg)).join(", ");
var rhs;
switch (protoRec.mode) {
case RecordType.Self:
rhs = context;
break;
case RecordType.Const:
rhs = codify(protoRec.funcOrValue);
break;
case RecordType.PropertyRead:
rhs = this._observe(`${context}.${protoRec.name}`, protoRec);
break;
case RecordType.SafeProperty:
var read = this._observe(`${context}.${protoRec.name}`, protoRec);
rhs =
`${this._utilName}.isValueBlank(${context}) ? null : ${this._observe(read, protoRec)}`;
break;
case RecordType.PropertyWrite:
rhs = `${context}.${protoRec.name} = ${getLocalName(protoRec.args[0])}`;
break;
case RecordType.Local:
rhs = this._observe(`${localsAccessor}.get(${rawString(protoRec.name)})`, protoRec);
break;
case RecordType.InvokeMethod:
rhs = this._observe(`${context}.${protoRec.name}(${argString})`, protoRec);
break;
case RecordType.SafeMethodInvoke:
var invoke = `${context}.${protoRec.name}(${argString})`;
rhs =
`${this._utilName}.isValueBlank(${context}) ? null : ${this._observe(invoke, protoRec)}`;
break;
case RecordType.InvokeClosure:
rhs = `${context}(${argString})`;
break;
case RecordType.PrimitiveOp:
rhs = `${this._utilName}.${protoRec.name}(${argString})`;
break;
case RecordType.CollectionLiteral:
rhs = `${this._utilName}.${protoRec.name}(${argString})`;
break;
case RecordType.Interpolate:
rhs = this._genInterpolation(protoRec);
break;
case RecordType.KeyedRead:
rhs = this._observe(`${context}[${getLocalName(protoRec.args[0])}]`, protoRec);
break;
case RecordType.KeyedWrite:
rhs = `${context}[${getLocalName(protoRec.args[0])}] = ${getLocalName(protoRec.args[1])}`;
break;
case RecordType.Chain:
rhs = 'null';
break;
default:
throw new BaseException(`Unknown operation ${protoRec.mode}`);
}
return `${getLocalName(protoRec.selfIndex)} = ${rhs};`;
}
/** @internal */
_observe(exp, rec) {
// This is an experimental feature. Works only in Dart.
if (this._changeDetection === ChangeDetectionStrategy.OnPushObserve) {
return `this.observeValue(${exp}, ${rec.selfIndex})`;
}
else {
return exp;
}
}
genPropertyBindingTargets(propertyBindingTargets, genDebugInfo) {
var bs = propertyBindingTargets.map(b => {
if (isBlank(b))
return "null";
var debug = genDebugInfo ? codify(b.debug) : "null";
return `${this._utilName}.bindingTarget(${codify(b.mode)}, ${b.elementIndex}, ${codify(b.name)}, ${codify(b.unit)}, ${debug})`;
});
return `[${bs.join(", ")}]`;
}
genDirectiveIndices(directiveRecords) {
var bs = directiveRecords.map(b => `${this._utilName}.directiveIndex(${b.directiveIndex.elementIndex}, ${b.directiveIndex.directiveIndex})`);
return `[${bs.join(", ")}]`;
}
/** @internal */
_genInterpolation(protoRec) {
var iVals = [];
for (var i = 0; i < protoRec.args.length; ++i) {
iVals.push(codify(protoRec.fixedArgs[i]));
iVals.push(`${this._utilName}.s(${this._names.getLocalName(protoRec.args[i])})`);
}
iVals.push(codify(protoRec.fixedArgs[protoRec.args.length]));
return combineGeneratedStrings(iVals);
}
genHydrateDirectives(directiveRecords) {
var res = [];
for (var i = 0; i < directiveRecords.length; ++i) {
var r = directiveRecords[i];
res.push(`${this._names.getDirectiveName(r.directiveIndex)} = ${this._genReadDirective(i)};`);
}
return res.join("\n");
}
_genReadDirective(index) {
// This is an experimental feature. Works only in Dart.
if (this._changeDetection === ChangeDetectionStrategy.OnPushObserve) {
return `this.observeDirective(this.getDirectiveFor(directives, ${index}), ${index})`;
}
else {
return `this.getDirectiveFor(directives, ${index})`;
}
}
genHydrateDetectors(directiveRecords) {
var res = [];
for (var i = 0; i < directiveRecords.length; ++i) {
var r = directiveRecords[i];
if (!r.isDefaultChangeDetection()) {
res.push(`${this._names.getDetectorName(r.directiveIndex)} = this.getDetectorFor(directives, ${i});`);
}
}
return res.join("\n");
}
genContentLifecycleCallbacks(directiveRecords) {
var res = [];
var eq = IS_DART ? '==' : '===';
// NOTE(kegluneq): Order is important!
for (var i = directiveRecords.length - 1; i >= 0; --i) {
var dir = directiveRecords[i];
if (dir.callAfterContentInit) {
res.push(`if(${this._names.getStateName()} ${eq} ${this._changeDetectorStateName}.NeverChecked) ${this._names.getDirectiveName(dir.directiveIndex)}.afterContentInit();`);
}
if (dir.callAfterContentChecked) {
res.push(`${this._names.getDirectiveName(dir.directiveIndex)}.afterContentChecked();`);
}
}
return res;
}
genViewLifecycleCallbacks(directiveRecords) {
var res = [];
var eq = IS_DART ? '==' : '===';
// NOTE(kegluneq): Order is important!
for (var i = directiveRecords.length - 1; i >= 0; --i) {
var dir = directiveRecords[i];
if (dir.callAfterViewInit) {
res.push(`if(${this._names.getStateName()} ${eq} ${this._changeDetectorStateName}.NeverChecked) ${this._names.getDirectiveName(dir.directiveIndex)}.afterViewInit();`);
}
if (dir.callAfterViewChecked) {
res.push(`${this._names.getDirectiveName(dir.directiveIndex)}.afterViewChecked();`);
}
}
return res;
}
}
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