angular-cn/tools/tslint/duplicateModuleImportRule.ts

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import {RuleWalker} from 'tslint/lib/language/walker';
import {RuleFailure} from 'tslint/lib/lint';
import {AbstractRule} from 'tslint/lib/rules';
import * as ts from 'typescript';
export class Rule extends AbstractRule {
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public static FAILURE_STRING = 'duplicate module import';
public apply(sourceFile: ts.SourceFile): RuleFailure[] {
const typedefWalker = new ModuleImportWalker(sourceFile, this.getOptions());
return this.applyWithWalker(typedefWalker);
}
}
class ModuleImportWalker extends RuleWalker {
importModulesSeen: string[] = [];
protected visitImportDeclaration(node: ts.ImportDeclaration): void {
this.visitModuleSpecifier(node.moduleSpecifier);
super.visitImportDeclaration(node);
}
protected visitImportEqualsDeclaration(node: ts.ImportEqualsDeclaration): void {
this.visitModuleSpecifier(node.moduleReference);
super.visitImportEqualsDeclaration(node);
}
private checkTypeAnnotation(location: number, typeAnnotation: ts.TypeNode, name?: ts.Node) {
if (typeAnnotation == null) {
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let ns = '<name missing>';
if (name != null && name.kind === ts.SyntaxKind.Identifier) {
ns = (<ts.Identifier>name).text;
}
if (ns.charAt(0) === '_') return;
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let failure = this.createFailure(location, 1, 'expected parameter ' + ns + ' to have a type');
this.addFailure(failure);
}
}
private visitModuleSpecifier(moduleSpecifier: ts.Node) {
var text = moduleSpecifier.getText();
if (this.importModulesSeen.indexOf(text) >= 0) {
let failure =
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this.createFailure(moduleSpecifier.getEnd(), 1, 'Duplicate imports from module ' + text);
this.addFailure(failure);
}
this.importModulesSeen.push(text);
}
}