angular-docs-cn/tools/tslint/requireParameterTypeRule.ts

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import {RuleFailure} from 'tslint/lib/lint';
import {AbstractRule} from 'tslint/lib/rules';
import {RuleWalker} from 'tslint/lib/language/walker';
import * as ts from 'tslint/node_modules/typescript';
export class Rule extends AbstractRule {
public static FAILURE_STRING = "missing type declaration";
public apply(sourceFile: ts.SourceFile): RuleFailure[] {
const typedefWalker = new TypedefWalker(sourceFile, this.getOptions());
return this.applyWithWalker(typedefWalker);
}
}
class TypedefWalker extends RuleWalker {
public visitMethodDeclaration(node: ts.MethodDeclaration) {
if (node.name.getText().charAt(0) !== '_') {
node.parameters.forEach((p: ts.ParameterDeclaration) => {
// a parameter's "type" could be a specific string value, for example `fn(option:
// "someOption", anotherOption: number)`
if (p.type == null || p.type.kind !== ts.SyntaxKind.StringLiteral) {
this.checkTypeAnnotation(p.getEnd(), <ts.TypeNode>p.type, p.name);
}
});
}
super.visitMethodDeclaration(node);
}
private checkTypeAnnotation(location: number, typeAnnotation: ts.TypeNode, name?: ts.Node) {
if (typeAnnotation == null) {
let ns = "<name missing>";
if (name != null && name.kind === ts.SyntaxKind.Identifier) {
ns = (<ts.Identifier>name).text;
}
if (ns.charAt(0) === '_') return;
let failure = this.createFailure(location, 1, "expected parameter " + ns + " to have a type");
this.addFailure(failure);
}
}
}