TemplateSystem

TemplateSystem is a templating engine and framework designed to separate content from presentation by rendering templates with a supplied data model. It provides a declarative templating language and a runtime that can be embedded in applications across multiple programming environments. The system emphasizes portability, extensibility, and safe rendering, making it suitable for web templates, configuration files, emails, and other text outputs.

Core concepts include variable interpolation, conditional blocks, loops, partials, and template inheritance. The language supports user-defined filters and functions, macro-like constructs, and includes for building complex layouts. Templates are parsed into an intermediate representation and may be compiled for performance. A sandbox mode limits access to host resources during rendering to improve security, and built-in escaping reduces the risk of injection attacks.

Implementation and usage: The project provides modules and adapters for several languages and can load templates from the file system, databases, or remote sources. It integrates with web frameworks, content management systems, and static-site generators. It supports streaming rendering to handle large outputs and offers caching and incremental re-rendering to improve responsiveness.

History and licensing: TemplateSystem originated as an open-source initiative in the mid-2010s and has since evolved through community contributions. It is maintained by a core team and a distributed set of maintainers. The project is released under an open-source license, with governance documented in its repository.