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File identifier feature.

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Allows you to add, and test for the presence of a magic 4-char
string in a FlatBuffer.

Tested: on OS X.

Change-Id: I090692a9e4fb53bed3543279a28563e67132cba0
This commit is contained in:
Wouter van Oortmerssen
2014-07-31 15:11:03 -07:00
parent be3c874258
commit 5da7bda826
13 changed files with 128 additions and 10 deletions
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29
src/idl_parser.cpp
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@@ -81,7 +81,9 @@ template<> inline Offset<void> atot<Offset<void>>(const char *s) {
TD(Enum, 263, "enum") \
TD(Union, 264, "union") \
TD(NameSpace, 265, "namespace") \
TD(RootType, 266, "root_type")
TD(RootType, 266, "root_type") \
TD(FileIdentifier, 267, "file_identifier") \
TD(FileExtension, 268, "file_extension")
#ifdef __GNUC__
__extension__ // Stop GCC complaining about trailing comma with -Wpendantic.
#endif
@@ -194,6 +196,14 @@ void Parser::Next() {
if (attribute_ == "union") { token_ = kTokenUnion; return; }
if (attribute_ == "namespace") { token_ = kTokenNameSpace; return; }
if (attribute_ == "root_type") { token_ = kTokenRootType; return; }
if (attribute_ == "file_identifier") {
token_ = kTokenFileIdentifier;
return;
}
if (attribute_ == "file_extension") {
token_ = kTokenFileExtension;
return;
}
// If not, it is a user-defined identifier:
token_ = kTokenIdentifier;
return;
@@ -802,11 +812,26 @@ bool Parser::Parse(const char *source) {
Next();
auto root_type = attribute_;
Expect(kTokenIdentifier);
Expect(';');
if (!SetRootType(root_type.c_str()))
Error("unknown root type: " + root_type);
if (root_struct_def->fixed)
Error("root type must be a table");
Expect(';');
} else if (token_ == kTokenFileIdentifier) {
Next();
file_identifier_ = attribute_;
Expect(kTokenStringConstant);
if (file_identifier_.length() !=
FlatBufferBuilder::kFileIdentifierLength)
Error("file_identifier must be exactly " +
NumToString(FlatBufferBuilder::kFileIdentifierLength) +
" characters");
Expect(';');
} else if (token_ == kTokenFileExtension) {
Next();
file_extension_ = attribute_;
Expect(kTokenStringConstant);
Expect(';');
} else {
ParseDecl();
}