Hammad Ali Posts - Answer Overflow

Hammad Ali

•Created by Hammad Ali on 11/10/2024 in #questions

Struct containing a list of itself?

Hi, I'm trying to creating a node-like tree which can contain a child (or children), but the mojo compiler doesn't really let me do that:

@value 
struct Node:
    var value: Int
    var children: List[Node]  # A list of Node objects

    fn __init__(inout self, value: Int):
        self.value = value
        self.children = List[Node]()  # Initialize an empty list

    fn add_child(inout self, child: Node):
        self.children.append(child)  # Add a child node to the list

fn main():
    var root = Node(1)
    var child1 = Node(2)
    var child2 = Node(3)

    root.add_child(child1)
    root.add_child(child2)

    print(root.value)  # Output: 1

@value 
struct Node:
    var value: Int
    var children: List[Node]  # A list of Node objects

    fn __init__(inout self, value: Int):
        self.value = value
        self.children = List[Node]()  # Initialize an empty list

    fn add_child(inout self, child: Node):
        self.children.append(child)  # Add a child node to the list

fn main():
    var root = Node(1)
    var child1 = Node(2)
    var child2 = Node(3)

    root.add_child(child1)
    root.add_child(child2)

    print(root.value)  # Output: 1

error: function has recursive call to 'always_inline' function struct Node: ^ Mojo/USL/shaderlab/libutils/utils_methods.mojo:87:8: note: through call here /Users/ec2-user/actions-runner/_work/modular/modular/Kernels/mojo/stdlib/collections/list.mojo:186:8: note: to function marked 'always_inline' here /Users/ec2-user/actions-runner/_work/modular/modular/Kernels/mojo/stdlib/memory/unsafe_pointer.mojo:413:9: note: call here recurses Mojo/USL/shaderlab/libutils/utils_methods.mojo:87:8: note: back to function here struct Node: ^ mojo: error: failed to run the pass manager

5 replies

MModular

•Created by Hammad Ali on 9/14/2024 in #community-showcase

USL: A Shader transpiler written in mojo

1 replies

MModular

•Created by Hammad Ali on 9/8/2024 in #questions

always_inline and struct problem

I'm trying to create a transpiler and I've created an architecutre in which every parsed token of the AST is repersented as ShaderOperation

struct ShaderOperation(PPrintable, CollectionElement):
    var tokens: List[Token]
    var name: String
    var arguments: List[ShaderOperation]
    var type: String

    fn __init__(inout self, tokens: List[Token], name: String, arguments: List[ShaderOperation], type: String):
       self.tokens = tokens
       self.name = name
       self.arguments = arguments
       self.type = type


    fn getName(inout self) -> String:
        return self.name
    
    fn setName(inout self, name:String) :
        self.name = name
   

    fn repr(inout self) -> String:
       return 'ShaderOperation$(name=' + self.name + ', type=' + self.type + ')'

    
    fn __copyinit__(inout self, existing: Self):
        self.arguments = existing.arguments
        self.type = existing.type
        self.name = existing.name
        self.tokens = existing.tokens

    
    fn __moveinit__(inout self, owned existing: Self):
        self.arguments = existing.arguments
        self.type = existing.type
        self.name = existing.name
        self.tokens = existing.tokens

struct ShaderOperation(PPrintable, CollectionElement):
    var tokens: List[Token]
    var name: String
    var arguments: List[ShaderOperation]
    var type: String

    fn __init__(inout self, tokens: List[Token], name: String, arguments: List[ShaderOperation], type: String):
       self.tokens = tokens
       self.name = name
       self.arguments = arguments
       self.type = type


    fn getName(inout self) -> String:
        return self.name
    
    fn setName(inout self, name:String) :
        self.name = name
   

    fn repr(inout self) -> String:
       return 'ShaderOperation$(name=' + self.name + ', type=' + self.type + ')'

    
    fn __copyinit__(inout self, existing: Self):
        self.arguments = existing.arguments
        self.type = existing.type
        self.name = existing.name
        self.tokens = existing.tokens

    
    fn __moveinit__(inout self, owned existing: Self):
        self.arguments = existing.arguments
        self.type = existing.type
        self.name = existing.name
        self.tokens = existing.tokens

But I get the error:

/Users/ec2-user/actions-runner/_work/modular/modular/Kernels/mojo/stdlib/collections/list.mojo:186:8: error: function has recursive call to 'always_inline' function
/Users/hammad/Documents/htdocs/Hammad-Subhtdocs/Mojo/USL/shaderlab/libutils/Typing.mojo:93:8: note: to function marked 'always_inline' here
struct ShaderOperation(PPrintable, CollectionElement):

/Users/ec2-user/actions-runner/_work/modular/modular/Kernels/mojo/stdlib/collections/list.mojo:186:8: error: function has recursive call to 'always_inline' function
/Users/hammad/Documents/htdocs/Hammad-Subhtdocs/Mojo/USL/shaderlab/libutils/Typing.mojo:93:8: note: to function marked 'always_inline' here
struct ShaderOperation(PPrintable, CollectionElement):

I need the arguments property to be a list of ShaderOperations because AST nodes are usually nested inside each other

7 replies

MModular

•Created by Hammad Ali on 8/6/2024 in #questions

Error while importing local python file

Hi I was doing some experiements with python and mojo but when I tried to import the local file I got the following error:

Unhandled exception caught during execution: No module named 'python_curl'
mojo: error: execution exited with a non-zero result: 1

Unhandled exception caught during execution: No module named 'python_curl'
mojo: error: execution exited with a non-zero result: 1

Here is the code:

from python import Python

fn main() raises:
    Python.add_to_path(".")
    var module = Python.import_module("python_curl.py")

from python import Python

fn main() raises:
    Python.add_to_path(".")
    var module = Python.import_module("python_curl.py")

Python file (python_curl.py)

import pycurl
from io import BytesIO

def curl_request():
    # Create a buffer to store the response
    buffer = BytesIO()
    
    # Create a cURL object
    c = pycurl.Curl()
    
    # Set the URL to fetch
    c.setopt(c.URL, 'https://httpbin.org/')
    
    # Write the response data to the buffer
    c.setopt(c.WRITEDATA, buffer)
    
    # Perform the request
    c.perform()
    
    # Close the cURL object
    c.close()
    
    # Get the response content
    response_body = buffer.getvalue().decode('utf-8')
    
    # Print the response
    return response_body

import pycurl
from io import BytesIO

def curl_request():
    # Create a buffer to store the response
    buffer = BytesIO()
    
    # Create a cURL object
    c = pycurl.Curl()
    
    # Set the URL to fetch
    c.setopt(c.URL, 'https://httpbin.org/')
    
    # Write the response data to the buffer
    c.setopt(c.WRITEDATA, buffer)
    
    # Perform the request
    c.perform()
    
    # Close the cURL object
    c.close()
    
    # Get the response content
    response_body = buffer.getvalue().decode('utf-8')
    
    # Print the response
    return response_body

6 replies

MModular

•Created by Hammad Ali on 4/5/2024 in #questions

Less Ugly way to concatenate strings

I have been working on a plotting library in mojo that is based on gnuplot. The code works but the string parts are extremely ugly:

...
    fn plotArray(inout self, *data: Float32, lineType:Int32=0, lineColor:Int32=7, title:String="Plot") raises:
        with open("m1v1tf01_temp.dat", "w") as f:
            var string: String = ""
            for dat in data:
                string += FloatToString(dat) + ",\n"
            f.write(string)
        self.gnuplot_gateway.callGNUPlotCommand("plot \"m1v1tf01_temp.dat\" title " + title + " lt " + IntToString(lineType) + " lc " + IntToString(lineColor)) # <<< Ugly strings
...

...
    fn plotArray(inout self, *data: Float32, lineType:Int32=0, lineColor:Int32=7, title:String="Plot") raises:
        with open("m1v1tf01_temp.dat", "w") as f:
            var string: String = ""
            for dat in data:
                string += FloatToString(dat) + ",\n"
            f.write(string)
        self.gnuplot_gateway.callGNUPlotCommand("plot \"m1v1tf01_temp.dat\" title " + title + " lt " + IntToString(lineType) + " lc " + IntToString(lineColor)) # <<< Ugly strings
...

So does anyone know a good way to concatenate strings? Does mojo have f-strings yet?

5 replies

MModular

•Created by Hammad Ali on 3/10/2024 in #questions

unable to load package '/Users/hammad/.modular/pkg/packages.modular.com_mojo/lib/mojo/stdlib.mojopkg

I just started working on an educational physics engine when suddenly mojo interpreter got angry at me for no reason and started throwing this error:

unable to load package '/Users/hammad/.modular/pkg/packages.modular.com_mojo/lib/mojo/stdlib.mojopkg'mojo

unable to load package '/Users/hammad/.modular/pkg/packages.modular.com_mojo/lib/mojo/stdlib.mojopkg'mojo

Code:

struct System:
    elasticPotentialEnergy = 0.0
    kineticEnergy = 0.0
    gravitaionalPotentialEnergy = 0.0
    ...

struct System:
    elasticPotentialEnergy = 0.0
    kineticEnergy = 0.0
    gravitaionalPotentialEnergy = 0.0
    ...

What's wrong?

6 replies

MModular

•Created by Hammad Ali on 2/23/2024 in #questions

Will Mojo Support constants after "let" is gone?

Given that mojo is removing the let keyword, will Mojo no longer have constants? Or will there be some other way to declare them?

2 replies

MModular

•Created by Hammad Ali on 2/9/2024 in #questions

Will Mojo ever become Open Source?

Mojo is a great language and has amazing potential but the fact that it is NOT open source like it's predecessor Python, is not cool. So will mojo become open source later on in it's development or will it remain proprietary and closed-source forever?

16 replies

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