Metadata-Version: 2.1
Name: hera-py
Version: 0.4.0
Summary: Interpreter for the Haverford Educational RISC Architecture (HERA) assembly language
Home-page: UNKNOWN
Author: Ian Fisher
Author-email: iafisher@protonmail.com
License: MIT
Project-URL: Source, https://github.com/iafisher/hera-py
Description: # hera-py
        
        [![Build Status](https://travis-ci.com/iafisher/hera-py.png)](https://travis-ci.com/iafisher/hera-py)
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        An interpreter for the [Haverford Educational RISC Architecture](https://www.haverford.edu/computer-science/resources/hera) (HERA) assembly language.
        
        ## Installation
        You can install hera-py with pip:
        
        ```
        $ pip3 install hera-py
        ```
        
        ## Usage
        After installation, hera-py can be invoked with the `hera` command to run a HERA program:
        
        ```
        $ hera my-hera-file.hera
        ```
        
        You can also preprocess a HERA program without running it, to see how pseudo-instructions and labels are resolved to HERA code:
        
        ```
        $ hera preprocess my-hera-file.hera
        ```
        
        ### Comparison with HERA-C
        HERA-C is the current HERA interpreter used as Haverford. It is implemented as a shell-script wrapper around a set of C++ macros that expand HERA instructions into C++ code. hera-py aims to improve on HERA-C in the following areas:
          - Ease of use
            - Cross-platform and easy to install
            - Configurable with command-line options
            - Does not create temporary files
            - Can read programs from stdin
            - Command name has six fewer letters than `HERA-C-Run`
          - Helpful error messages
          - Simple debugging
        
        hera-py also supports several features that HERA-C does not:
          - Multi-precision multiplication
          - Relative branching by a fixed integer value (e.g., `BRR(10)`)
          - Branching by the value of a register (e.g., `SET(R1, 20); BR(R1)`)
          - Setting registers to the value of a label
        
        HERA-C has a few features that hera-py does not:
          - C-style #define macros (and more generally the ability to embed arbitrary C++ code in HERA programs)
          - Relative branching to labels (though the same outcome can be achieved with register-mode branching)
        
        ## Design
        Running a HERA program takes a few steps:
        
        1. The text of the program is parsed into a list of instruction objects.  (`hera/parser.py`)
        2. The symbol table for the program is generated.  (`hera/symtab.py`)
        3. The program is type-checked to ensure that all operations take the proper number and type of operands.  (`hera/typechecker.py`)
        4. Pseudo-instructions are converted into actual instructions, and labels and constants are substituted for their values.  (`hera/preprocessor.py`)
        5. The instructions are executed on a virtual HERA machine.  (`hera/vm.py`)
        
        For more details about the implementation, see the docstrings in each module.
        
Platform: UNKNOWN
Classifier: Programming Language :: Python :: 3
Classifier: License :: OSI Approved :: MIT License
Classifier: Natural Language :: English
Classifier: Topic :: Software Development :: Assemblers
Description-Content-Type: text/markdown
