AstBuilder.java 文件源码

@Override
public AstNode visitPostIfStmt(KalangParser.PostIfStmtContext ctx) {
    ExprNode leftExpr = visitExpression(ctx.expression(0));
    if (!(leftExpr instanceof AssignExpr)) {
        diagnosisReporter.report(Diagnosis.Kind.ERROR, "AssignExpr required", ctx);
    }
    AssignExpr assignExpr = (AssignExpr) leftExpr;
    AssignableExpr to = assignExpr.getTo();
    ExprNode from = assignExpr.getFrom();
    ExprNode cond = visitExpression(ctx.expression(1));
    Token op = ctx.op;
    if (op != null) {
        String opStr = op.getText();
        BinaryExpr be = createBinaryExpr(to, cond, opStr);
        cond = be;
    }
    AssignExpr as = new AssignExpr(to, from);
    IfStmt is = new IfStmt(cond);
    is.getTrueBody().statements.add(new ExprStmt(as));
    mapAst(is,ctx);
    return is;
}