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| 1 | +# Spin Standard Library Style Guide |
| 2 | + |
| 3 | +Traditionally, Spin has been difficult for inexperienced developers to start with. |
| 4 | +This has to change for it to be taken seriously as an educational platform. |
| 5 | + |
| 6 | +This guide has been written to aid in developing a consistent, accessible out-of-the-box |
| 7 | +experience of the Spin language. |
| 8 | + |
| 9 | +## Submissions |
| 10 | + |
| 11 | +New object submissions should include demos for readily available reference |
| 12 | +hardware. For example: |
| 13 | + |
| 14 | +* Sample code that runs as-is on a Propeller HYDRA |
| 15 | +* Sample code and a circuit schematic for running the code on a Propeller Activity Board |
| 16 | + |
| 17 | +## Organization |
| 18 | + |
| 19 | +The Spin Standard Library is organized into the following folder structure. |
| 20 | + |
| 21 | + . |
| 22 | + └── library |
| 23 | + ├── demos |
| 24 | + ├── examples |
| 25 | + └── templates |
| 26 | + |
| 27 | +#### library/ |
| 28 | + |
| 29 | +The top-level of the library that will be included with PropellerIDE. All core object additions go here. |
| 30 | +Anything above this level is not distributed. |
| 31 | + |
| 32 | +##### demos/ |
| 33 | + |
| 34 | +These files are organized hierarchically based on the object they demonstrate. For example, let's say we |
| 35 | +have the following module. |
| 36 | + |
| 37 | + com.serial.fullduplex |
| 38 | + |
| 39 | +You should be able to find sample code for it in the following location: |
| 40 | + |
| 41 | + com/serial/FullDuplex.spin |
| 42 | + |
| 43 | +Or if there are multiple examples: |
| 44 | + |
| 45 | + com/serial/fullduplex/ThisDemo.spin |
| 46 | + com/serial/fullduplex/ThatDemo.spin |
| 47 | + |
| 48 | +##### examples/ |
| 49 | + |
| 50 | +Not all sample code fits neatly into one object or another. For more complex demonstrations that may |
| 51 | +use many different objects, the `examples/` folder is used. |
| 52 | + |
| 53 | +This is a good place for demonstrations that will run as-is on a given piece of hardware. |
| 54 | + |
| 55 | +##### templates/ |
| 56 | + |
| 57 | +Files included in `templates/` will be available within PropellerIDE's "New From Template" feature. These are |
| 58 | +named how they will appear, with spaces replaced with underscores. Therefore, "Awesome Template v1.0" |
| 59 | +should be saved as: |
| 60 | + |
| 61 | + Awesome_Template_v1.0.spin |
| 62 | + |
| 63 | +## Style |
| 64 | + |
| 65 | +Owing to Spin's similarity to Python, for topics not covered here, please refer |
| 66 | +to [PEP-8](https://www.python.org/dev/peps/pep-0008/) where appropriate. |
| 67 | + |
| 68 | +In no particular order: |
| 69 | + |
| 70 | +* Skip one line after declaring a block and before starting a new one; no more, no less. |
| 71 | + |
| 72 | + Yes: |
| 73 | + |
| 74 | + PUB Foo |
| 75 | + |
| 76 | + Bar |
| 77 | + |
| 78 | + PUB Biz |
| 79 | + |
| 80 | + Boo |
| 81 | + |
| 82 | + No: |
| 83 | + |
| 84 | + PUB Foo |
| 85 | + Bar |
| 86 | + PUB Biz |
| 87 | + |
| 88 | + |
| 89 | + |
| 90 | + Boo |
| 91 | + |
| 92 | +* Use **4** spaces for indentation. |
| 93 | + |
| 94 | +* Always *indent* inside of blocks. Existing Spin compilers do not require this |
| 95 | + but failing to do so produces hard-to-read code. |
| 96 | + |
| 97 | + Yes: |
| 98 | + |
| 99 | + PUB Foo |
| 100 | + |
| 101 | + Bar |
| 102 | + Baz |
| 103 | + |
| 104 | + No: |
| 105 | + |
| 106 | + PUB Foo |
| 107 | + |
| 108 | + Bar |
| 109 | + Baz |
| 110 | + |
| 111 | +* Treat all files as case-sensitive. Spin does not require this but it is good practice |
| 112 | + anyway. |
| 113 | + |
| 114 | +* Always capitalize the same way. |
| 115 | + |
| 116 | + * Blocks and constants are upper-case (`PUB`, `CON`, ...). |
| 117 | + |
| 118 | + * Variables, labels, and non-block keywords are lower-case (`offsetx`, `temp`, ...). |
| 119 | + |
| 120 | + * Function names are CamelCase (`DoSomething`, `EnableFeature`, ...). |
| 121 | + |
| 122 | +* Avoid extraneous spaces in code. |
| 123 | + |
| 124 | +* Avoid excessive commenting; only comment individual lines of code when necessary. |
| 125 | + |
| 126 | +* **Do not** add licensing stubs or header information. This information is automatically |
| 127 | + added to software releases from the repository itself. |
| 128 | + |
| 129 | +* **Do** add documentation comments after function block declarations. These will be |
| 130 | + rendered into documentation in later PropellerIDE releases. |
| 131 | + |
| 132 | + PUB ThisFunction(val, val2) |
| 133 | + '' This is an interesting function |
| 134 | + |
| 135 | + HereIsTheCode |
| 136 | + MoreCode(val2) |
| 137 | + val += 2 |
| 138 | + |
| 139 | +* Do not use Parallax font-specific special characters or in-source schematic diagrams. |
| 140 | + This feature is not portable and will be removed from PropellerIDE in the future. |
| 141 | + PropellerIDE will eventually support markdown syntax in documentation, so it is |
| 142 | + recommended to draw pictures of any diagrams and add them to a folder called `images/` |
| 143 | + in the same folder as the object. |
| 144 | + |
| 145 | + For an illustration in a core object: |
| 146 | + |
| 147 | + com.serial.fullduplex.spin |
| 148 | + images/com/serial/fullduplex/img1.png |
| 149 | + |
| 150 | + For a demo object: |
| 151 | + |
| 152 | + com/serial/fullduplex/FullDuplex.spin |
| 153 | + com/serial/fullduplex/images/img1.png |
| 154 | + |
| 155 | +## Questions? |
| 156 | + |
| 157 | +Please submit any questions or feedback you have to the |
| 158 | +[issue tracker](https://github.com/parallaxinc/spin-standard-library/issues). |
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