Parsing with Boost Spirit X3
Almost 10 years ago, we looked at Spirit 2.x for parsing. Since that time the Spirit library has evolved to Spirit X3, a C++14 version of Spirit that is "an object-oriented, recursive-descent parser for C++". Spirit X3 is a header-only library that allows you to write your grammar directly in C++ using the mechanism of expression templates. When expressed as a Spirit X3 grammar in C++, the resulting code closely resembles BNF (Backus-Naur Form) representations of a grammar.
The common result of parsing a piece of text is an abstract syntax tree (AST) that represents the structure parsed from the input. Spirit has a rich system of attribute synthesis that can be used to build the AST directly during parsing. The application uses the resulting AST from parsing to perform some function. In a compiler, the AST is used to generate code in some form for the target processor.
This month, Richard Thomson will give us a refresher on parsing with Spirit X3. Along the way we'll look at the following topics:
How to parse basic primitive values (float, int, string, etc.)
How to combine primitive parsers to handle complex sequences and structures
How to add error handling to the parse process
How to annotate parsed elements with the location in the source input for better error messages
How to customize the parsing process with a custom AST data structure
How to traverse the custom AST using the Visitor pattern
Example code: https://github.com/LegalizeAdulthood/...
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