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public static AstRoot parse (String code) {
CompilerEnvirons env = new CompilerEnvirons();
env.setRecoverFromErrors(true);
env.setGenerateDebugInfo(true);
env.setRecordingComments(true);
// try to ignore errors - does not seem to work
env.setIdeMode(true);
IRFactory factory = new IRFactory(env);
AstRoot root = factory.parse(code, null, 0);
// work around rhino bug 800616 (not fixed in neither rhino nor closure)
root.visit(new NodeVisitor() {
@Override
public boolean visit(AstNode node) {
if (node instanceof NumberLiteral) {
NumberLiteral num = (NumberLiteral)node;
int from = num.getAbsolutePosition();
int to = from + num.getLength() + 2;
if (to < code.length()) {
String hex = "0x" + num.toSource();
if (code.substring(from, to).equals(hex)) {
// reset node value and length
num.setValue(hex); num.setLength(hex.length());
}
}
return false;
}
return true;
}
});
// work around rhino SwitchStatement.toSource() bug with empty switches
// https://github.com/mozilla/rhino/blob/master/src/org/mozilla/javascript/ast/SwitchStatement.java#L96
// https://github.com/mozilla/rhino/blob/master/src/org/mozilla/javascript/ast/SwitchStatement.java#L107-L109
// https://github.com/mozilla/rhino/blob/master/src/org/mozilla/javascript/ast/SwitchStatement.java#L158
root.visit(new NodeVisitor() {
@Override
public boolean visit(AstNode node) {
if (node instanceof SwitchStatement) {
SwitchStatement ss = (SwitchStatement)node;
if (ss.getCases().isEmpty()) {
// need to add at least one node to make ss.cases non-null
ArrayList<SwitchCase> cases = new ArrayList<>();
cases.add(new SwitchCase());
ss.setCases(cases);
// set this back to empty list
cases.clear();
ss.setCases(cases);
}
return false;
}
return true;
}
});
return root;
}
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