mirror of
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182 lines
4.7 KiB
Markdown
182 lines
4.7 KiB
Markdown
# Import System
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## Case Sensitivity
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All import paths are case-sensitive. Ensure that the case used in import statements matches exactly with the file and directory names.
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## Syntax
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Imports can be declared two ways:
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```py
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from path import name
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# or
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import path/name
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```
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## Project Structure
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Let's assume we have a bend project with the following structure:
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```
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my_project/
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├── main.bend
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├── utils/
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│ ├── helper.bend
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│ │ └── def calc
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│ └── math.bend
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│ ├── def add
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│ └── def subtract
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```
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## Importing Relative Paths
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Paths starting with `./` or `../` are imported relative to the file.
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### Example:
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```py
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# if used inside `my_project/*.bend`
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from ./utils import helper
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# if used inside `my_project/*/*.bend`
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import ../utils/helper
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```
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This will bind `calc` from `helper.bend` as `helper/calc`.
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## Importing Absolute Paths
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Otherwise, paths imported are relative to the folder of the main file.
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### Example:
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```py
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from utils import math
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# or
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import utils/math
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```
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This will bind `add` and `subtract` from `math.bend` as `math/add` and `math/subtract`.
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## Importing Specific Top-Level Names
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You can import specific top-level names from a file.
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### Example:
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```py
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from utils/helper import calc
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from utils/math import (add, subtract)
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# or
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import (utils/helper/calc, utils/math/add, utils/math/subtract)
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# or
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import utils/helper/calc
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import utils/math/add
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import utils/math/subtract
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```
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This will bind the names `calc`, `add` and `subtract` from their respective files.
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## Importing All Names
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You can import all top-level names from a file using the wildcard `*`.
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### Example:
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```py
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from utils/math import *
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```
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This will bind the names `add` and `subtract` from `math.bend`.
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## Importing All `.bend` Files from a Folder
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You can import all `.bend` files from a folder using the wildcard `*`.
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### Example:
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```py
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from utils import *
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```
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This will bind the names from `helper.bend` and `math.bend`, as `helper/calc`, `math/add` and `math/subtract`.
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## Aliasing Imports
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You can alias imports to a different name for convenience.
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### Importing a File with Alias
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Import the `file` top-level name from `file.bend` aliased to `alias`, and all other names as `alias/name`.
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### Example:
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```py
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from utils import helper as utilsHelper
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import utils/math as mathLib
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```
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This will bind the names from `helper.bend` and `math.bend`, as `utilsHelper/calc`, `mathLib/add` and `mathLib/subtract`.
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### Importing Specific Names with Aliases
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You can import specific top-level names and alias them to different names.
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### Example:
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```py
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from utils/helper import calc as calcFunc
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from utils/math import (add as addFunc, subtract as subFunc)
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# or
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import (utils/math/add as addFunc, utils/math/subtract as subFunc)
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```
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This will bind `calc`, `add` and `subtract` as `calcFunc`, `addFunc` and `subFunc` from their respective files.
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## Project Structure
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Let's assume we have a bend project with the following structure:
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```
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my_project/
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├── main.bend
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├── types/
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│ ├── List.bend
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│ │ └── type List: Nil | (Cons ..)
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│ └── List/
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│ ├── concat.bend
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│ │ └── def concat
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│ └── append.bend
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│ └── def append
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│ └── def helper
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```
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## Importing data types
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You can import a data type and its constructors by only importing its name.
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### Example:
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```py
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from types/List import List
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# behaves the same as
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from types/List import (List, List/Nil, List/Cons)
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```
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Importing only `List` from `List.bend` will import the type `List` and bind its constructors name `List/Nil` and `List/Cons`.
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## Importing files with a top level name equal to its name
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When a file and a top-level name in it share a name, for example, `List.bend`, `concat.bend` and `append.bend`, the bind of that import is simplified to the file name.
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### Example:
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```py
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from types/List import append
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```
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This will bind `append` and `append/helper` from `append.bend`.
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## Files and directories with the same name
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When files and directories share a name, both share the import namespace:
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```py
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from types/List import (List, concat)
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```
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This will attempt to import from both the `List.bend` file and the `List` folder, resulting in the binds `List/Nil`, `List/Cons` and `concat`.
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```py
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from types/List import *
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```
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This will import all the names from `List.bend`, then all the files inside the `List` folder, resulting in the binds `List/Nil`, `List/Cons`, `concat`, `append` and `append/helper`.
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In both cases, if a name is present as a top-level name on the file, and as a `.bend` file name inside the folder, it will result in an error.
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If you only want to import `List.bend` and not search the files in its folder, you can use the `import path` syntax:
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```py
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import types/List
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```
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