Ox version 1.10 is now available on SourceForge (sourceforge.net/projects/ox-attribute-grammar-compiler/).

Ox generalizes the function of Yacc in the way that an attribute grammar generalizes a context-free grammar. Ordinary Yacc and Lex specifications may be augmented with definitions of synthesized and inherited attributes written in C/C++ syntax. Ox checks these specifications for consistency and completeness, and generates from them a program that builds and decorates attributed parse trees. The user may specify post-decoration traversals for easy ordering of side effects, such as code generation. Ox handles the
tedious and error-prone details of writing code for parse-tree management, so its use eases problems of security and maintainability associated with that aspect of translator development.


Ox NEWS

* Noteworthy changes in release 1.10 (8 Oct 2021)

** Internals

This release is primarily a "low hanging fruit" conversion of the Ox source from C99 to C++11:
- Explicit and implicit calls to the C library memory allocation functions
were eliminated (except within the 'flex' lexer skeleton code).
- C strings and the associated C library string manipulation functions were replaced by the 'std::string' class (except within the 'flex' lexer skeleton code).
- C structs were upgraded with constructors.
- C data structures were replaced with structures derived from C++ standard containers.
- Function argument pointer types were replaced with reference types.
- Pointers used to step through data structures were replaced with iterators.
- C variable length arrays were replaced with 'std::string' or 'std::vector'
- The global pointer variables "char **ptext" and "int *pleng", used to reference local data in the lexers, were eliminated.

The generation of an empty 'switch' case in 'yyyDecorate ()' is avoided if there is no attribute to be evaluated.

The generation of an empty 'switch' case in 'yyyDoTraversals ()' is avoided if there is no traversal action for a rule.


** Bug fixes

Parsing of an array subscript within traversal code was corrected.


** Test suite

The 'trav2' test case was updated to verify correct parsing of array subscription within traversal code.


** Build system

GNUlib components are no longer needed for a portable Ox build.

Build support was removed for the following compilers, due to defects
uncovered in the implementation of the C++ 2011 standard during portability testing:
- GNU gcc/g++ 4.8.x
- Solaris Developer Studio 12.5 and 12.6

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