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null checking throughout logical and/or

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dcode
2019-04-09 04:25:38 +02:00
parent da4a7751fd
commit cd79376101
4 changed files with 102 additions and 12 deletions
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12
src/compiler.ts
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@ -4755,8 +4755,14 @@ export class Compiler extends DiagnosticEmitter {
case Token.AMPERSAND_AMPERSAND: { // left && right
leftExpr = this.compileExpressionRetainType(left, contextualType, WrapMode.NONE);
leftType = this.currentType;
let previousFlow = this.currentFlow;
let rightFlow = previousFlow.fork();
this.currentFlow = rightFlow;
rightFlow.inheritNonnullIf(leftExpr);
rightExpr = this.compileExpression(right, leftType, ConversionKind.IMPLICIT, WrapMode.NONE);
rightType = leftType;
this.currentFlow = previousFlow;
// simplify if only interested in true or false
if (contextualType == Type.bool || contextualType == Type.void) {
@ -4799,8 +4805,14 @@ export class Compiler extends DiagnosticEmitter {
case Token.BAR_BAR: { // left || right
leftExpr = this.compileExpressionRetainType(left, contextualType, WrapMode.NONE);
leftType = this.currentType;
let previousFlow = this.currentFlow;
let rightFlow = previousFlow.fork();
this.currentFlow = rightFlow;
rightFlow.inheritNonnullIfNot(leftExpr);
rightExpr = this.compileExpression(right, leftType, ConversionKind.IMPLICIT, WrapMode.NONE);
rightType = leftType;
this.currentFlow = previousFlow;
// simplify if only interested in true or false
if (contextualType == Type.bool || contextualType == Type.void) {