gencpp/project/Readme.md

# Documentation

This library is currently in a bootstrapping phase.

Eventually it will have zero dependencies and have its code size severely constricted.

All dependencies are currently held within `Bloat.hpp` and `Bloat.cpp`

All the library code is contained in two files: `gen.hpp` and `gen.cpp`


## Bloat.hpp/cpp

Currently acts as the isolation header for thridparty dependencies along with code not directly related to the library.

Organization:

* ZPL inclusion and selective symbol exposure to global scope.
* Utility macro definitions used throughout the library.
* Global memory arena definition
* StrC and String definitions
* Token string formatter
* Formatted and Fatal Logs

The cpp contains the implementation of the global memory arena and the token formmatter.

Any global symbol pollution will be removed when dependencies are intergrated properly into the library.

## gen.hpp

While getting fleshed out, all feature macros are defined on the top of the header.

These macros are:

* `GEN_DEFINE_LIBRARY_CORE_CONSTANTS` : Optional typename codes as they are non-standard to C/C++ and not necessary to library usage
* `GEN_FEATURE_INCREMENTAL` : Defines the incremental constructors
* `GEN_FEATURE_PARSING` : Defines the parse constructors
* `GEN_FEATURE_EDITOR` : Defines the file editing features for changing definitions based on ASTs
* `GEN_FEATURE_SCANNER` : Defines the file scanning features for generating ASTs

Due to the design of `gen.hpp` to support being written alongside runtime intended code (in the same file), all the code is wrapped in a `gen_time` `#ifdef` and then wrapped further in a `gen` namespace to avoid pollution of the global scope.

*Note: Its possible with the scanner feature to support parsing runtime files that use "generic" macros or identifiers with certain patterns.  
This can be used to auto-queue generation of dependent definitions for the symbols used.*

### Organization

log_failure definition : based on whether to always use fatal on all errors

Major enum definitions and their associated functions used with the AST data

* `ECode` : Used to tag ASTs by their type
* `EOperator` : Used to tag operator overloads with thier op type
* `ESpecifier` : Used with specifier ASTs for all specifiers the user may tag an associated
AST with.
* `AccessSpec` : Used with class and struct ASTs to denote the public, protected, or private fields.
* `ModuleFlag` : Used with any valid definition that can have export or import related keywords assoicated with it.

#### Data Structures

`StringTable` : Hash table for cached strings. (`StringCached` typedef used to denote strings managed by it)

`AST` : The node data strucuture for the code.
`Code` : Wrapper for `AST` with functionality for handling it appropriately.

`TypeTable` : Hash table for cached typename ASTs.

#### Gen Interface

First set of fowards are either backend functions used for various aspects of AST generation or configurating allocators used for different containers.

Interface fowards defined in order of: Upfront, Parsing, Untyped.

From there forwards for the File handlers are defined: Builder, Editor, Scanner.

#### Macros

General helper macros are defined along with the optional DSL macros.

#### Constants

Constants including optional ones are defined.

#### Inlines

Inlined functions related to the AST datatype that required forwards for gen interface functions are defined.

## gen.cpp

* Static data defined at the top.
* AST Body case macros are next.
* AST implementation follows
* Gen interface begins with its `init`, `deinit`, etc.. Until `make_code_entires`
* operator__validate defined, which will be used to verify if an operator definition is constructible.
* Allocator interface for data arrays, code pool, code entries, string arenas, and string table.
* Helper macros used throughout the constructor API
* Upfront constructors, following the same order as shown in the header.
* Incremental constructors
* Parsing constructors, it defines its own lexer, and has many helper functions for parsing not exposed through the header.
* Untyped constructors
* Builder
* Editor
* Scanner