Add else if to translator #32

[AxelB1011]

• Added else if to translator
• Removed comment(s)
• [pre-commit.ci] auto fixes from pre-commit.com hooks
• added else if support to Directx backend
• added Assignment and, assignment or, assignment xor, xor , assignemnt modulus and modulus to the translator frontend. closes #48,#50,#51,#52,#53
• tests for else_if added
• [pre-commit.ci] auto fixes from pre-commit.com hooks
• [pre-commit.ci] auto fixes from pre-commit.com hooks
• Implement tokens for unsigned int and double data types (#68)
• fix for multiple else if conditionals
• Implement a very basic parser for simple Mojo syntax.
• more fixes for multiple else if conditionals
• More fixes
• Missing newline
• fix CI error
• fix CI error
• Refactored Logical Operation token in Translator Frontend (#91)
• Removed name=main

PR Description

Modified the following files in the crosstl/src/translator directory:

parser.py: Updated the the parse_if_statement() function. directx_codegen.py: Implemented else if for HLSL output. metal_codegen.py: Implemented else if for Metal output. opengl_codegen.py: Implemented else if for GLSL output. test_lexer.py, test_parser.py, test_directx_codegen.py, test_metal_codegen.py, test_opengl_codegen.py: Added tests for multiple else if conditionals in test_translator and test_translator/test_codegen.

Related Issue

Closed #32

shader Sample

shader PerlinNoise {
    vertex {
        input vec3 position;
        output vec2 vUV;

        void main() {
            vUV = position.xy * 10.0;
            if (vUV.x < 0.5) {
                vUV.x = 0.25;
            }
            if (vUV.x < 0.25) {
                vUV.x = 0.0;
            } else if (vUV.x < 0.75) {
                vUV.x = 0.5;
            } else if (vUV.x < 1.0) {
                vUV.x = 0.75;
            } else {
                vUV.x = 0.0;
            }
            gl_Position = vec4(position, 1.0);
        }
    }

    // Fragment Shader
    fragment {
        input vec2 vUV;
        output vec4 fragColor;

        void main() {
            if (vUV.x > 0.75) {
                fragColor = vec4(1.0, 1.0, 1.0, 1.0);
            } else if (vUV.x > 0.5) {
                fragColor = vec4(0.5, 0.5, 0.5, 1.0);
            } else if (vUV.x > 0.25) {
                fragColor = vec4(0.25, 0.25, 0.25, 1.0);
            } else {
                fragColor = vec4(0.0, 0.0, 0.0, 1.0);
            }
            fragColor = vec4(color, 1.0);
            }
        }
    }

Checklist

• [x] Have you added the necessary tests?
• [x] Only modified the files mentioned in the related issue(s)?
• [x] Are all tests passing?

[AxelB1011]

@samthakur587 I have created a new PR as per your advice. Please let me know if this is alright. It might be better to squash all the commits that I've made into one or just cherry pick the latest one but I'm not sure if that is okay

[samthakur587]

hii @AxelB1011 great work so far just one last thing to fix . let's assume you have two continues if statements how do you handle this . the parser not parse this second if state.

can you try this example code for test your code .

shader PerlinNoise {
    vertex {
        input vec3 position;
        output vec2 vUV;

        void main() {
            vUV = position.xy * 10.0;
            if (vUV.x < 0.5) {
                vUV.x = 0.25;
            }
            if (vUV.x < 0.25) {
                vUV.x = 0.0;
            }

            } else if (vUV.x < 0.75) {
                vUV.x = 0.5;
            } else {
                vUV.x = 0.0;
            }
            gl_Position = vec4(position, 1.0);
        }
    }

    // Fragment Shader
    fragment {
        input vec2 vUV;
        output vec4 fragColor;

        void main() {
            if (vUV.x > 0.75) {
                fragColor = vec4(1.0, 1.0, 1.0, 1.0);
            } else if (vUV.x > 0.5) {
                fragColor = vec4(0.5, 0.5, 0.5, 1.0);
            } else {
                fragColor = vec4(0.0, 0.0, 0.0, 1.0);
            }
            fragColor = vec4(color, 1.0);
            }
        }
    }

[samthakur587]

you can take reference from this PR . i fixed this issue here . #39

[AxelB1011]

Thank you for the feedback @samthakur587! I have used your code for reference and updated the tests. The parser seems to be working fine, unless I am missing something..?

hii @AxelB1011 great work so far just one last thing to fix . let's assume you have two continues if statements how do you handle this . the parser not parse this second if state.

can you try this example code for test your code .

shader PerlinNoise {
    vertex {
        input vec3 position;
        output vec2 vUV;

        void main() {
            vUV = position.xy * 10.0;
            if (vUV.x < 0.5) {
                vUV.x = 0.25;
            }
            if (vUV.x < 0.25) {
                vUV.x = 0.0;
            } else if (vUV.x < 0.75) {
                vUV.x = 0.5;
            } else {
                vUV.x = 0.0;
            }
            gl_Position = vec4(position, 1.0);
        }
    }

    // Fragment Shader
    fragment {
        input vec2 vUV;
        output vec4 fragColor;

        void main() {
            if (vUV.x > 0.75) {
                fragColor = vec4(1.0, 1.0, 1.0, 1.0);
            } else if (vUV.x > 0.5) {
                fragColor = vec4(0.5, 0.5, 0.5, 1.0);
            } else {
                fragColor = vec4(0.0, 0.0, 0.0, 1.0);
            }
            fragColor = vec4(color, 1.0);
            }
        }
    }