This package contains modules for handling abstract Erlang syntax
trees, in a way that is compatible with the "parse trees" of the
standard library module erl_parse
, together with utilities for reading
source files in unusual ways and pretty-printing syntax trees. Also
included is an amazing module merger and renamer called Igor, as well as
an automatic code-cleaner.
The abstract layer (defined in erl_syntax) is nicely structured and the node types are context-independent. The layer makes it possible to transparently attach source-code comments and user annotations to nodes of the tree. Using the abstract layer makes applications less sensitive to changes in the erl_parse(3) data structures, only requiring the erl_syntax module to be up-to-date.
The pretty printer erl_prettypr is implemented on top of the library module prettypr: this is a powerful and flexible generic pretty printing library, which is also distributed separately.
For a short demonstration of parsing and pretty-printing, simply
compile the included module demo.erl, and execute
demo:run()
from the Erlang shell. It will compile the
remaining modules and give you further instructions.
Also try the erl_tidy module, as follows:
erl_tidy:dir("any-erlang-source-dir", [test, old_guard_tests]).
("test
" assures that no files are modified).
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