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nextLineRule.ts
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61 lines (51 loc) · 2.76 KB
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import * as Lint from "tslint/lib";
import * as ts from "typescript";
const OPTION_CATCH = "check-catch";
const OPTION_ELSE = "check-else";
export class Rule extends Lint.Rules.AbstractRule {
public static CATCH_FAILURE_STRING = "'catch' should not be on the same line as the preceeding block's curly brace";
public static ELSE_FAILURE_STRING = "'else' should not be on the same line as the preceeding block's curly brace";
public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
return this.applyWithWalker(new NextLineWalker(sourceFile, this.getOptions()));
}
}
class NextLineWalker extends Lint.RuleWalker {
public visitIfStatement(node: ts.IfStatement) {
const sourceFile = node.getSourceFile();
const thenStatement = node.thenStatement;
const elseStatement = node.elseStatement;
if (!!elseStatement) {
// find the else keyword
const elseKeyword = getFirstChildOfKind(node, ts.SyntaxKind.ElseKeyword);
if (this.hasOption(OPTION_ELSE) && !!elseKeyword) {
const thenStatementEndLoc = sourceFile.getLineAndCharacterOfPosition(thenStatement.getEnd());
const elseKeywordLoc = sourceFile.getLineAndCharacterOfPosition(elseKeyword.getStart(sourceFile));
if (thenStatementEndLoc.line === elseKeywordLoc.line) {
const failure = this.createFailure(elseKeyword.getStart(sourceFile), elseKeyword.getWidth(sourceFile), Rule.ELSE_FAILURE_STRING);
this.addFailure(failure);
}
}
}
super.visitIfStatement(node);
}
public visitTryStatement(node: ts.TryStatement) {
const sourceFile = node.getSourceFile();
const catchClause = node.catchClause;
// "visit" try block
const tryBlock = node.tryBlock;
if (this.hasOption(OPTION_CATCH) && !!catchClause) {
const tryClosingBrace = tryBlock.getLastToken(sourceFile);
const catchKeyword = catchClause.getFirstToken(sourceFile);
const tryClosingBraceLoc = sourceFile.getLineAndCharacterOfPosition(tryClosingBrace.getEnd());
const catchKeywordLoc = sourceFile.getLineAndCharacterOfPosition(catchKeyword.getStart(sourceFile));
if (tryClosingBraceLoc.line === catchKeywordLoc.line) {
const failure = this.createFailure(catchKeyword.getStart(sourceFile), catchKeyword.getWidth(sourceFile), Rule.CATCH_FAILURE_STRING);
this.addFailure(failure);
}
}
super.visitTryStatement(node);
}
}
function getFirstChildOfKind(node: ts.Node, kind: ts.SyntaxKind) {
return node.getChildren().filter((child) => child.kind === kind)[0];
}