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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var ts = require("typescript");
var node_1 = require("../typeguard/node");
function endsControlFlow(statement) {
if (node_1.isBlockLike(statement))
return handleBlock(statement).end;
switch (statement.kind) {
case ts.SyntaxKind.ForStatement:
case ts.SyntaxKind.ForOfStatement:
case ts.SyntaxKind.ForInStatement:
case ts.SyntaxKind.WhileStatement:
case ts.SyntaxKind.DoStatement:
case ts.SyntaxKind.SwitchStatement:
if (statement.parent.kind === ts.SyntaxKind.LabeledStatement)
statement = statement.parent;
}
return getControlFlowEnd(statement).end;
}
exports.endsControlFlow = endsControlFlow;
var defaultControlFlowEnd = { statements: [], end: false };
function getControlFlowEnd(statement, label) {
switch (statement.kind) {
case ts.SyntaxKind.ReturnStatement:
case ts.SyntaxKind.ThrowStatement:
case ts.SyntaxKind.ContinueStatement:
case ts.SyntaxKind.BreakStatement:
return { statements: [statement], end: true };
case ts.SyntaxKind.Block:
return handleBlock(statement);
case ts.SyntaxKind.ForStatement:
case ts.SyntaxKind.ForOfStatement:
case ts.SyntaxKind.ForInStatement:
case ts.SyntaxKind.DoStatement:
case ts.SyntaxKind.WhileStatement:
return matchBreakOrContinue(getControlFlowEnd(statement.statement), node_1.isBreakOrContinueStatement, label);
case ts.SyntaxKind.IfStatement:
return handleIfStatement(statement);
case ts.SyntaxKind.SwitchStatement:
return matchBreakOrContinue(handleSwitchStatement(statement), node_1.isBreakStatement, label);
case ts.SyntaxKind.TryStatement:
return handleTryStatement(statement);
case ts.SyntaxKind.LabeledStatement:
return getControlFlowEnd(statement.statement, statement.label);
case ts.SyntaxKind.WithStatement:
return getControlFlowEnd(statement.statement);
default:
return defaultControlFlowEnd;
}
}
function handleBlock(statement) {
var result = { statements: [], end: false };
for (var _i = 0, _a = statement.statements; _i < _a.length; _i++) {
var s = _a[_i];
var current = getControlFlowEnd(s);
(_b = result.statements).push.apply(_b, current.statements);
if (current.end) {
result.end = true;
break;
}
}
return result;
var _b;
}
function handleIfStatement(node) {
var then = getControlFlowEnd(node.thenStatement);
if (node.elseStatement === undefined) {
then.end = false;
return then;
}
var elze = getControlFlowEnd(node.elseStatement);
return {
statements: then.statements.concat(elze.statements),
end: then.end && elze.end,
};
}
function handleSwitchStatement(node) {
var hasDefault = false;
var result = {
statements: [],
end: false,
};
for (var _i = 0, _a = node.caseBlock.clauses; _i < _a.length; _i++) {
var clause = _a[_i];
if (clause.kind === ts.SyntaxKind.DefaultClause)
hasDefault = true;
var current = handleBlock(clause);
result.end = current.end;
(_b = result.statements).push.apply(_b, current.statements);
}
if (!hasDefault)
result.end = false;
return result;
var _b;
}
function handleTryStatement(node) {
var result;
if (node.finallyBlock !== undefined) {
result = handleBlock(node.finallyBlock);
if (result.end)
return result;
}
var tryResult = handleBlock(node.tryBlock);
result = result === undefined
? tryResult
: { statements: result.statements.concat(tryResult.statements), end: tryResult.end };
if (node.catchClause !== undefined) {
var current = handleBlock(node.catchClause.block);
result = {
statements: result.statements.concat(current.statements),
end: current.end,
};
}
return result;
}
function matchBreakOrContinue(current, pred, label) {
var result = {
end: current.end,
statements: [],
};
for (var _i = 0, _a = current.statements; _i < _a.length; _i++) {
var statement = _a[_i];
if (pred(statement) && (statement.label === undefined || label !== undefined && statement.label.text === label.text)) {
result.end = false;
continue;
}
result.statements.push(statement);
}
return result;
}
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