forked from microsoft/TypeScript
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathnextLineRule.ts
More file actions
67 lines (58 loc) · 2.8 KB
/
nextLineRule.ts
File metadata and controls
67 lines (58 loc) · 2.8 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
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[] {
const options = this.getOptions().ruleArguments;
const checkCatch = options.indexOf(OPTION_CATCH) !== -1;
const checkElse = options.indexOf(OPTION_ELSE) !== -1;
return this.applyWithFunction(sourceFile, ctx => walk(ctx, checkCatch, checkElse));
}
}
function walk(ctx: Lint.WalkContext<void>, checkCatch: boolean, checkElse: boolean): void {
const { sourceFile } = ctx;
ts.forEachChild(sourceFile, function recur(node) {
switch (node.kind) {
case ts.SyntaxKind.IfStatement:
checkIf(node as ts.IfStatement);
break;
case ts.SyntaxKind.TryStatement:
checkTry(node as ts.TryStatement);
break;
}
ts.forEachChild(node, recur);
});
function checkIf(node: ts.IfStatement): void {
const { thenStatement, elseStatement } = node;
if (!elseStatement) {
return;
}
// find the else keyword
const elseKeyword = getFirstChildOfKind(node, ts.SyntaxKind.ElseKeyword);
if (checkElse && !!elseKeyword) {
const thenStatementEndLoc = sourceFile.getLineAndCharacterOfPosition(thenStatement.getEnd());
const elseKeywordLoc = sourceFile.getLineAndCharacterOfPosition(elseKeyword.getStart(sourceFile));
if (thenStatementEndLoc.line === elseKeywordLoc.line) {
ctx.addFailureAtNode(elseKeyword, Rule.ELSE_FAILURE_STRING);
}
}
}
function checkTry({ tryBlock, catchClause }: ts.TryStatement): void {
if (!checkCatch || !catchClause) {
return;
}
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) {
ctx.addFailureAtNode(catchKeyword, Rule.CATCH_FAILURE_STRING);
}
}
}
function getFirstChildOfKind(node: ts.Node, kind: ts.SyntaxKind) {
return node.getChildren().filter((child) => child.kind === kind)[0];
}