Struct ConditionEvaluator

pub struct ConditionEvaluator { /* private fields */ }

Enhanced condition evaluator for processor dispatch

This evaluator extends the basic condition system with processor-specific evaluation capabilities, including data pattern matching, context evaluation, and complex condition expressions.

ExifTool Reference

ExifTool uses various condition patterns in SubDirectory definitions:

{
    Condition => '$$valPt =~ /^0204/',
    SubDirectory => { ProcessProc => \&ProcessNikonEncrypted }
},
{
    Condition => '$$self{Model} =~ /EOS R5/',
    SubDirectory => { ProcessProc => \&ProcessCanonSerialDataMkII }
}

Implementations

impl ConditionEvaluator

pub fn new() -> Self

Create a new condition evaluator

pub fn evaluate_context_condition( &mut self, context: &ProcessorContext, condition_expr: &str, ) -> Result<bool>

Evaluate a condition expression against a processor context

This method parses and evaluates ExifTool-style condition expressions against the provided context, returning true if the condition matches.

Examples

• "$model =~ /EOS R5/" - Model contains “EOS R5”
• "$manufacturer eq 'Canon'" - Exact manufacturer match
• "exists($serialNumber)" - Serial number tag is available
• "$tagID == 0x001d" - Specific tag ID match

pub fn evaluate_data_condition( &mut self, data: &[u8], condition_expr: &str, ) -> Result<bool>

Evaluate a condition against data pattern

This method evaluates conditions that match against binary data patterns, commonly used for format detection and processor selection.

pub fn evaluate_data_condition_parsed( &mut self, data: &[u8], condition: &Condition, ) -> Result<bool>

Evaluate a parsed condition against binary data

pub fn register_tag_evaluator<E: TagEvaluator + 'static>( &mut self, name: String, evaluator: E, )

Register a custom tag evaluator

Trait Implementations

impl Default for ConditionEvaluator

fn default() -> Self

Returns the “default value” for a type.