private void ProcessByteExtraction(string regionName, string ruleLabel, string ruleComment, ByteOptionContext byteOptions, int bytes, string byteLabel)
{
// See if it has a "described by" annotation, which we'll use
// as a lookup table to augment the comment.
string describedBy = null;
if (byteOptions.label() != null)
{
describedBy = byteOptions.label().GetText();
}
// Process the bytes based on the byte format (i.e.: "as ASCII")
ByteFormatContext byteFormat = byteOptions.byteFormat();
if (byteFormat != null)
{
ProcessByByteFormat(byteFormat, (int)bytes, byteLabel, regionName, ruleLabel, describedBy, ruleComment);
}
else
{
// This has no byte format. It is just bytes.
this.parseActions[regionName].Add(
new ParseAction((content, contentPosition) =>
{
if (!String.IsNullOrEmpty(byteLabel))
{
bytes = GetByteCountFromLabel(byteLabel);
}
byte[] element = new byte[bytes];
Array.Copy(content, (int)contentPosition, element, 0, bytes);
ParseElement(ruleLabel, element, describedBy, ruleComment);
return((int)bytes);
}
));
}
}
public ByteOptionContext byteOption() {
ByteOptionContext _localctx = new ByteOptionContext(Context, State);
EnterRule(_localctx, 14, RULE_byteOption);
int _la;
try {
EnterOuterAlt(_localctx, 1);
{
State = 88; sizeReference();
State = 89; Match(BYTES);
State = 97;
_la = TokenStream.La(1);
if (_la==AS) {
{
State = 90; Match(AS);
State = 91; byteFormat();
State = 95;
_la = TokenStream.La(1);
if (_la==DESCRIBED) {
{
State = 92; Match(DESCRIBED);
State = 93; Match(BY);
State = 94; label();
}
}
}
}
}
}
catch (RecognitionException re) {
_localctx.exception = re;
ErrorHandler.ReportError(this, re);
ErrorHandler.Recover(this, re);
}
finally {
ExitRule();
}
return _localctx;
}
public override void EnterParseRule([NotNull] BinShredParser.ParseRuleContext context)
{
string regionName = context.label().GetText();
parseActions[regionName] = new List <ParseAction>();
processingActions.Push(regionName);
if (String.IsNullOrEmpty(startAction))
{
startAction = regionName;
}
foreach (RuleBodyContext body in context.ruleBody())
{
// This is a rule that describes additional actions to be taken from something
// already parsed
// "(additional properties identified by propertyName from lookupTableName)"
if (body.ADDITIONAL() != null)
{
string propertyName = body.propertyName().GetText();
string lookupTableName = body.lookupTableName().GetText();
ProcessAdditionalProperties(propertyName, lookupTableName, regionName);
continue;
}
// Get the rule's label and descriptive comment (/** */)
string ruleLabel = body.label().GetText();
string ruleComment = null;
ITerminalNode docComment = body.DOC_COMMENT();
if (docComment != null)
{
ruleComment = docComment.GetText();
ruleComment = ruleComment.Substring(3, ruleComment.Length - 5).Trim();
}
// Get the rule's options
RuleOptionsContext options = body.ruleOptions();
if (options != null)
{
// This is a rule with actual options (i.e.: "(4 bytes as int32)")
ByteOptionContext byteOptions = options.byteOption();
int bytes = 0;
String byteLabel = String.Empty;
if (byteOptions.sizeReference().INT() != null)
{
bytes = Int32.Parse(byteOptions.sizeReference().INT().GetText());
}
else
{
byteLabel = byteOptions.sizeReference().label().GetText();
}
// This is a rule that extracts bytes in some format
ProcessByteExtraction(regionName, ruleLabel, ruleComment, byteOptions, bytes, byteLabel);
}
else
{
// This is a rule with a reference to another rule
if (body.ITEMS() != null)
{
// This is a rule which creates several records of a given record type
// (i.e.: (12 items) or (byteCount items)
int items = 0;
string itemLabel = String.Empty;
if (body.sizeReference().INT() != null)
{
items = Int32.Parse(body.sizeReference().INT().GetText());
}
else
{
itemLabel = body.sizeReference().label().GetText();
}
ProcessCountedRule(regionName, ruleLabel, ruleComment, items, itemLabel);
}
else
{
this.parseActions[regionName].Add(
new ParseAction((content, contentPosition) =>
{
OrderedDictionary currentResult = new OrderedDictionary(StringComparer.OrdinalIgnoreCase);
results.Peek().Add(ruleLabel, currentResult);
RunRule(ruleComment, ruleLabel, currentResult);
return(0);
}
));
}
}
}
}