ComfyUI Logic Support is a custom node extension that provides various logic and utility nodes to enhance your ComfyUI workflows. These nodes enable more complex conditional logic, string manipulation, and numerical operations.

Installation

Clone this repository into your ComfyUI custom_nodes directory:

cd /path/to/ComfyUI/custom_nodes
git clone https://github.com/yourusername/Comfyui-Logic-Support.git

Restart ComfyUI or refresh the page if it's already running.

Nodes

NumberRangeIndex

Determines which range a number belongs to and returns the corresponding index.

Inputs:
- number: The input number to check
- base_type: Range calculation method ("L <= n < R" or "L < n <= R")
- value_1 to value_15: Boundary values for ranges
- default_index: Starting index for results (default: 0)
Outputs:
- INDEX: The index of the range the number belongs to

BooleanIndexAdder

Adds the index of the first true value among 15 boolean inputs to a base number.

Inputs:
- base_number: The number to add the index to
- bool1 to bool15: Boolean inputs
Outputs:
- NUMBER: The result of adding the index to the base number

NumberConditionChecker

Checks if a number is within specified bounds and returns a boolean result.

Inputs:
- lower_value: Lower bound value
- lower_op: Lower bound operator ("NONE", "<", "<=")
- number: The number to check
- upper_op: Upper bound operator ("NONE", "<", "<=")
- upper_value: Upper bound value
Outputs:
- BOOLEAN: True if the number satisfies all conditions, otherwise False

StringConcatenator

Concatenates up to 15 input strings into a single output string with a specified separator.

Inputs:
- separator_type: Type of separator ("EMPTY", "COMMA", "SPACE", "PIPE")
- string1 to string15: Strings to concatenate
Outputs:
- STRING: The concatenated string

StringSwitchByNumber

Outputs a string based on a numeric index input, supporting up to 15 strings.

Inputs:
- number: Index of the string to output (1-based)
- string1 to string15: Available strings
Outputs:
- STRING: The selected string

Examples

Using NumberRangeIndex for Conditional Processing

[Number Input: 15] → [NumberRangeIndex] → [Index determines further processing]

Creating Dynamic Text with StringConcatenator

[Text Input 1: "Hello"] → [StringConcatenator: SPACE] → [Output: "Hello World"]
[Text Input 2: "World"] ↗

Conditional Logic with BooleanIndexAdder

[Base Number: 10] → [BooleanIndexAdder] → [Output: 12]
[Boolean Input 1: False] ↗
[Boolean Input 2: True] ↗

License

MIT License

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Example Workflow

The repository includes an example workflow (logic_support_example.json) that demonstrates how to use the logic nodes to create dynamic text prompts based on numeric inputs like age. This workflow uses:

NumberRangeIndex to determine age ranges
StringSwitchByNumber to select appropriate text based on the age range
StringConcatenator to combine multiple text elements into a final prompt

You can load this example in ComfyUI by using the "Load" button and selecting the logic_support_example.json file.