Csound Linting in Atom

This Atom package adds syntax checking for Csound orchestras.

Including Files

The linter-csound preprocessor searches paths for files included using #include in this order:

The paths returned by Project::getPaths. (This array usually contains one path that’s roughly equivalent to the current directory.)
The path of the file being preprocessed.
If there are files named .csound-include-directories in the paths returned by Project::getPaths, the paths (one per line) contained in each .csound-include-directories file. For example, if you create a file named .csound-include-directories in the root folder of your project, and this file contains
```
/usr/local/csound/udos
/usr/local/csound/more-udos
```
then linter-csound will search /usr/local/csound/udos and /usr/local/csound/more-udos for included files.
Paths you enter in linter-csound’s Settings.

Contributing

Open an issue, or fork this project and make a pull request.

linter-csound’s Orchestra Parser

To check the syntax of orchestras, linter-csound uses a preprocessor and parser generated using the GerHobbelt fork of Jison. The grammar used by the parser is based on this JavaScript grammar (which you can read about here) and this C grammar. To generate the preprocessor and parser on macOS, open a Terminal, cd to linter-csound/lib/csound-parser, and then run:

npm install https://github.com/GerHobbelt/jison/archive/0.6.1-215.tar.gz
node generate-parser.js

The linter-csound preprocessor and parser try to match Csound’s behavior, but linter-csound’s implementations are quite different. Here is how linter-csound’s Jison files correspond to Csound’s Flex/Bison files:

This Jison file	Corresponds to this Flex/Bison file
preprocessor.jisonlex	csound_pre.lex
orchestra.jisonlex	csound_orc.lex
orchestra.jison	csound_orc.y

Known Differences from Csound’s Preprocessor

Csound’s preprocessor:

permits 0-length parameter names in function-like macros. This orchestra prints hello, world:
```
#define MACRO(arg') #$arg,$#
prints "$MACRO(hello' world)\n"
scoreline_i "e"
```
The linter-csound preprocessor treats 0-length parameter names as errors.
permits duplicate parameter names in function-like macros. The linter-csound preprocessor treats duplicate parameter names as errors.
continues to compile after attempting to #include a directory. The linter-csound preprocessor treats this as an error.

Known Differences from Csound’s Parser

Csound’s parser silently ignores duplicate labels, while linter-csound gives a warning.