Enum Transformation 

pub enum Transformation {
    FieldNameMapping {
        mapping: HashMap<String, String>,
    },
    FieldNamePrefixMapping {
        mapping: HashMap<String, String>,
    },
    FieldNamePrefix {
        prefix: String,
    },
    FieldNameSuffix {
        suffix: String,
    },
    DropDetectionItem,
    AddCondition {
        conditions: HashMap<String, SigmaValue>,
        negated: bool,
    },
    ChangeLogsource {
        category: Option<String>,
        product: Option<String>,
        service: Option<String>,
    },
    ReplaceString {
        regex: String,
        replacement: String,
        skip_special: bool,
    },
    ValuePlaceholders,
    WildcardPlaceholders,
    QueryExpressionPlaceholders {
        expression: String,
    },
    SetState {
        key: String,
        value: String,
    },
    RuleFailure {
        message: String,
    },
    DetectionItemFailure {
        message: String,
    },
    FieldNameTransform {
        transform_func: String,
        mapping: HashMap<String, String>,
    },
    HashesFields {
        valid_hash_algos: Vec<String>,
        field_prefix: String,
        drop_algo_prefix: bool,
    },
    MapString {
        mapping: HashMap<String, Vec<String>>,
    },
    SetValue {
        value: SigmaValue,
    },
    ConvertType {
        target_type: String,
    },
    Regex,
    AddField {
        field: String,
    },
    RemoveField {
        field: String,
    },
    SetField {
        fields: Vec<String>,
    },
    SetCustomAttribute {
        attribute: String,
        value: String,
    },
    CaseTransformation {
        case_type: String,
    },
    Nest {
        items: Vec<TransformationItem>,
    },
}

All supported pipeline transformation types.

Variants

FieldNameMapping

Map field names via a lookup table.

Fields

mapping: HashMap<String, String>

FieldNamePrefixMapping

Map field name prefixes.

Fields

mapping: HashMap<String, String>

FieldNamePrefix

Add a prefix to all matched field names.

Fields

prefix: String

FieldNameSuffix

Add a suffix to all matched field names.

Fields

suffix: String

DropDetectionItem

Remove matching detection items.

AddCondition

Add field=value conditions to the rule’s detection.

Fields

conditions: HashMap<String, SigmaValue>

negated: bool

If true, negate the added conditions.

ChangeLogsource

Replace logsource fields.

Fields

category: Option<String>

product: Option<String>

service: Option<String>

ReplaceString

Regex replacement in string values.

When skip_special is true, replacement is applied only to the plain (non-wildcard) segments of SigmaString, preserving * and ? wildcards. Mirrors pySigma’s ReplaceStringTransformation.skip_special.

Fields

regex: String

replacement: String

skip_special: bool

ValuePlaceholders

Expand %name% placeholders with pipeline variables.

WildcardPlaceholders

Replace unresolved %name% placeholders with * wildcard.

QueryExpressionPlaceholders

Store expression template (no-op for eval, kept for YAML compat).

Fields

expression: String

SetState

Set key-value in pipeline state.

Fields

key: String

value: String

RuleFailure

Fail if rule conditions match.

Fields

message: String

DetectionItemFailure

Fail if detection item conditions match.

Fields

message: String

FieldNameTransform

Apply a named function to field names (lowercase, uppercase, etc.). In pySigma this takes a Python callable; we support named functions.

Fields

transform_func: String

One of: “lower”, “upper”, “title”, “snake_case”

mapping: HashMap<String, String>

Explicit overrides: field → new_name (applied instead of the function).

HashesFields

Decompose the Hashes field into per-algorithm fields.

Hashes: "SHA1=abc,MD5=def" → FileSHA1: abc + FileMD5: def

Fields

valid_hash_algos: Vec<String>

Allowed hash algorithms (e.g. ["MD5", "SHA1", "SHA256"]).

field_prefix: String

Prefix for generated field names (e.g. "File" → FileMD5).

drop_algo_prefix: bool

If true, omit algo name from field (use just prefix).

MapString

Map string values via a lookup table.

Supports one-to-many mapping: a single value can map to multiple alternatives (pySigma compat). When one-to-many is used, the detection item’s values list is expanded in place.

Fields

mapping: HashMap<String, Vec<String>>

SetValue

Set all values of matching detection items to a fixed value.

Fields

value: SigmaValue

ConvertType

Convert detection item values to a different type. Supported: “str”, “int”, “float”, “bool”.

Fields

target_type: String

Regex

Convert plain string values to regex patterns.

AddField

Add a field name to the rule’s output fields list.

Fields

field: String

RemoveField

Remove a field name from the rule’s output fields list.

Fields

field: String

SetField

Set (replace) the rule’s output fields list.

Fields

fields: Vec<String>

SetCustomAttribute

Set a custom attribute on the rule.

Stores the key-value pair in SigmaRule.custom_attributes. Backends / engines can read these to modify per-rule behavior (e.g. rsigma.suppress, rsigma.action). Mirrors pySigma’s SetCustomAttributeTransformation.

Fields

attribute: String

value: String

CaseTransformation

Apply a case transformation to string values. Supported: “lower”, “upper”, “snake_case”.

Fields

case_type: String

Nest

Nested sub-pipeline: apply a list of transformations as a group. The inner items share the same conditions as the outer item.

Fields

items: Vec<TransformationItem>

Implementations

impl Transformation

pub fn apply( &self, rule: &mut SigmaRule, state: &mut PipelineState, detection_item_conditions: &[DetectionItemCondition], field_name_conditions: &[FieldNameCondition], field_name_cond_not: bool, ) -> Result<bool>

Apply this transformation to a SigmaRule, mutating it in place.

Returns Ok(true) if the transformation was applied, Ok(false) if skipped.

Trait Implementations

impl Clone for Transformation

fn clone(&self) -> Transformation

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Transformation

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.