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56 lines
2.2 KiB
ReStructuredText
56 lines
2.2 KiB
ReStructuredText
.. _ref-sect-literate:
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**********************
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Literate Programming
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**********************
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Idris2 supports several types of literate mode styles.
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The unlit'n has been designed based such that we assume that we are parsing markdown-like languages
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The unlit'n is performed by a Lexer that uses a provided literate style to recognise code blocks and code lines.
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Anything else is ignored.
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A literate style consists of:
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+ a list of String encoded code block deliminators;
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+ a list of line indicators; and
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+ a list of valid file extensions.
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Lexing is simple and greedy in that when consuming anything that is a code blocks we treat everything as code until we reach the closing deliminator.
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This means that use of verbatim modes in a literate file will also be treated as active code.
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In future we should add support for literate ``LaTeX`` files, and potentially other common document formats.
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But more importantly, a more intelligent processing of literate documents using a pandoc like library in Idris such as: `Edda <https://github.com/jfdm/edda>` would also be welcome.
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Bird Style Literate Files
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=========================
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Bird notation is a classic literate mode found in Haskell, (and Orwell) in which code lines begin with ``>``.
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Other lines are treated as documentation.
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We treat files with an extension of ``.lidr`` as bird style literate files.
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Embedding in Markdown-like documents
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====================================
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While Bird Style literate mode is useful, it does not lend itself well
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to more modern markdown-like notations such as Org-Mode and CommonMark.
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Idris2 also provides support for recognising both 'visible' and 'invisible' code blocks and lines in both CommonMark and OrgMode documents.
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OrgMode
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*******
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+ Org mode source blocks for idris are recognised as visible code blocks,
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+ Comment blocks that begin with ``#+COMMENT: idris`` are treated as invisible code blocks.
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+ Invisible code lines are denoted with ``#+IDRIS:``.
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We treat files with an extension of ``.org`` as org-mode style literate files.
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CommonMark
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************
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Only code blocks denoted by standard code blocks labelled as idris are recognised.
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We treat files with an extension of ``.md`` and ``.markdown`` as org-mode style literate files.
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