fix(rules): uncombine ion-navbar-is-now-ion-toolbar rule (#38)

Previously the rule was adding an ion-back-button (and container) as
well as changing the tag names to ion-toolbar.

We have a rule for warning about the missing back button: `ion-back-button-not-added-by-default`

It's probably best to keep these separated for simplicity

src/ionNavbarIsNowIonToolbarRule.ts

@@ -1,109 +1,5 @@
-import * as ast from '@angular/compiler';
-import { NgWalker } from 'codelyzer/angular/ngWalker';
-import { BasicTemplateAstVisitor } from 'codelyzer/angular/templates/basicTemplateAstVisitor';
-import * as Lint from 'tslint';
-import { IOptions } from 'tslint';
-import * as ts from 'typescript';
+import { createElementRenameRuleClass } from './helpers/elementRename';
 
 export const ruleName = 'ion-navbar-is-now-ion-toolbar';
-const InvalidSyntaxBoxOpen = '<ion-navbar>';
-const InvalidSyntaxBoxClose = '</ion-navbar>';
-const InvalidSyntaxBoxRe = new RegExp('<ion-navbar[^>]*>((.|\n)*?)</ion-navbar>');
-const ValidSyntaxOpen = `<ion-toolbar>
-  <ion-buttons slot="start">
-    <ion-back-button></ion-back-button>
-  </ion-buttons>`;
 
-const ValidSyntaxClose = `\n</ion-toolbar>`;
-
-const getReplacements = (text: ast.ElementAst, absolutePosition: number) => {
-  const content: string = text.sourceSpan.start.file.content;
-
-  const results = InvalidSyntaxBoxRe.exec(content);
-
-  let match = undefined;
-  const newLineRegex = new RegExp(/\n/g, 'g');
-
-  const newlineLocations = [];
-
-  do {
-    match = newLineRegex.exec(content);
-
-    if (match) {
-      newlineLocations.push(match.index);
-    }
-  } while (match);
-
-  let startingLine = text.sourceSpan.start.line;
-  let endingLine = text.endSourceSpan.end.line;
-
-  let endingCol = text.endSourceSpan.end.col;
-
-  let length = 0;
-
-  if (endingLine > startingLine) {
-    for (let i = startingLine; i <= endingLine; i++) {
-      if (i === startingLine) {
-        length += newlineLocations[i] - text.sourceSpan.start.col;
-      } else if (i - 1 === endingLine) {
-        length += text.endSourceSpan.end.col - 1;
-      } else {
-        length += getLineLength(newlineLocations, i);
-      }
-    }
-  } else {
-    length = text.endSourceSpan.end.col - text.sourceSpan.start.col;
-  }
-
-  return [new Lint.Replacement(absolutePosition, length, `${ValidSyntaxOpen}${results[1].trim()}${ValidSyntaxClose}`)];
-};
-
-class IonNavbarIsNowIonToolbarTemplateVisitor extends BasicTemplateAstVisitor {
-  visitElement(element: ast.ElementAst, context: any): any {
-    if (element.name) {
-      let error = null;
-
-      if (element.name === 'ion-navbar') {
-        error = 'ion-navbar is no longer used. Please use ion-toolbar.';
-      }
-
-      if (error) {
-        const expr: any = (<any>element.sourceSpan).toString();
-        const internalStart = expr.indexOf(InvalidSyntaxBoxOpen) + 1;
-        const start = element.sourceSpan.start.offset + internalStart;
-        const absolutePosition = this.getSourcePosition(start - 1);
-
-        this.addFailure(this.createFailure(start, expr.trim().length, error, getReplacements(element, absolutePosition)));
-      }
-    }
-
-    super.visitElement(element, context);
-  }
-}
-
-export class Rule extends Lint.Rules.AbstractRule {
-  public static metadata: Lint.IRuleMetadata = {
-    ruleName: ruleName,
-    type: 'functionality',
-    description: 'Ion Navbar has been removed and Ion Toolbar is now the recommended component.',
-    options: null,
-    optionsDescription: 'Not configurable.',
-    typescriptOnly: false,
-    hasFix: true
-  };
-
-  public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
-    return this.applyWithWalker(
-      new NgWalker(sourceFile, this.getOptions(), {
-        templateVisitorCtrl: IonNavbarIsNowIonToolbarTemplateVisitor
-      })
-    );
-  }
-}
-function getLineLength(newlineLocations: any[], i: number) {
-  if (i > 0) {
-    return newlineLocations[i] - newlineLocations[i - 1];
-  }
-
-  return newlineLocations[i];
-}
+export const Rule = createElementRenameRuleClass(ruleName, 'ion-navbar', 'ion-toolbar');