Examples of com.google.caja.parser.js.TryStmt

com.google.caja.parser.js.TryStmt
A try - catch - finally block. @author mikesamuel@gmail.com


  public final void testMaskedExceptionVariablesSame() throws Exception {
    Block outerBlock = js(fromString(
        "try { } catch (e) { try { } catch (e) { var x; } }"));


    TryStmt t0 = (TryStmt) outerBlock.children().get(0);
    CatchStmt c0 = t0.getCatchClause();
    Block b0 = c0.getBody();
    TryStmt t1 = (TryStmt) b0.children().get(0);
    CatchStmt c1 = t1.getCatchClause();


    Scope sn = fromProgram(outerBlock);
    Scope sc0 = Scope.fromCatchStmt(sn, c0);
    Scope.fromCatchStmt(sc0, c1);

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  }


  public final void testStartStatementsForCatchStmt() throws Exception {
    Scope s0 = fromProgram(js(fromString("{}")));
    Block block = js(fromString("try {} catch (e) {}"));
    TryStmt t = (TryStmt)block.children().get(0);
    Scope s1 = Scope.fromCatchStmt(s0, t.getCatchClause());


    assertEquals(0, s0.getStartStatements().size());
    assertEquals(0, s1.getStartStatements().size());


    s1.addStartStatement(js(fromString("{}")));

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    assertEquals(1, s1.getStartStatements().size());
  }


  public final void testUnmaskableIdentifiersInCatch() throws Exception {
    Block b = js(fromString("try {} catch (Object) {}"));
    TryStmt tryStmt = (TryStmt) b.children().get(0);
    Scope top = fromProgram(b);
    Scope.fromCatchStmt(top, tryStmt.getCatchClause());
    assertMessage(
        RewriterMessageType.CANNOT_MASK_IDENTIFIER, MessageLevel.FATAL_ERROR,
        MessagePart.Factory.valueOf("Object"));
  }

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          substitutes="try { @body*; } catch (@ex___) { @handler*; }")
      public ParseTreeNode fire(ParseTreeNode node, Scope scope) {
        Map<String, ParseTreeNode> bindings = this.match(node);
        if (bindings != null) {
          Identifier ex = (Identifier) bindings.get("ex");
          TryStmt ts = (TryStmt) node;
          CatchStmt cs = ts.getCatchClause();
          if (isSynthetic(ex)) {
            return substV(
                "body", rw.expand(bindings.get("body"), scope),
                "ex", rw.noexpand(ex),
                "handler", rw.expand(
                    bindings.get("handler"), Scope.fromCatchStmt(scope, cs)));
          }
        }
        return NONE;
      }
    },


    new Rule() {
      @Override
      @RuleDescription(
          name="syntheticCatches2",
          synopsis="Pass through synthetic variables which are unmentionable.",
          reason="Catching unmentionable exceptions helps maintain invariants.",
          matches=(
               "try { @body*; } catch (/* synthetic */ @ex___) { @handler*; }"
               + " finally { @cleanup*; }"),
          substitutes=(
               "try { @body*; } catch (/* synthetic */ @ex___) { @handler*; }"
               + " finally { @cleanup*; }"))
      public ParseTreeNode fire(ParseTreeNode node, Scope scope) {
        Map<String, ParseTreeNode> bindings = this.match(node);
        if (bindings != null) {
          TryStmt ts = (TryStmt) node;
          CatchStmt cs = ts.getCatchClause();
          Identifier ex = (Identifier) bindings.get("ex");
          if (isSynthetic(ex)) {
            return substV(
                "body", rw.expand(bindings.get("body"), scope),
                "ex", rw.noexpand(ex),

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      if ((lasti & 1) == 0) {  // else clause
        nodes.set(lasti, returnLast(nodes.get(lasti)));
      }
      result = new Conditional(node.getFilePosition(), null, nodes);
    } else if (node instanceof TryStmt) {
      TryStmt tryer = (TryStmt) node;
      result = new TryStmt(
          node.getFilePosition(),
          (Block) returnLast(tryer.getBody()),
          tryer.getCatchClause(),
          tryer.getFinallyClause());
    }
    if (null == result) { return node; }
    result.getAttributes().putAll(node.getAttributes());
    return result;
  }

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Related Classes of com.google.caja.parser.js.TryStmt

com.google.caja.parser.quasiliteral.ES53Rewriter

com.google.caja.parser.quasiliteral.ScopeTest

com.google.caja.parser.quasiliteral.SyntheticRuleSet

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