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