Struct ExpressionEvaluator

pub struct ExpressionEvaluator<'a> { /* private fields */ }

Expression evaluator for format specifications ExifTool: lib/Image/ExifTool.pm:9853-9856 eval mechanism for $val{} expressions

Implementations

impl<'a> ExpressionEvaluator<'a>

pub fn new( val_hash: HashMap<u32, DataMemberValue>, data_members: &'a HashMap<String, DataMemberValue>, ) -> Self

Create new expression evaluator

pub fn evaluate_count_expression(&self, expr: &str) -> Result<usize, ExifError>

Evaluate a format expression to get a count value ExifTool: lib/Image/ExifTool.pm:9853-9856 eval $count mechanism

pub fn resolve_format( &self, spec: &FormatSpec, ) -> Result<ResolvedFormat, ExifError>

Resolve a format specification by evaluating any expressions

pub fn evaluate_complex_expression( &self, expr: &str, ) -> Result<usize, ExifError>

Evaluate complex mathematical expressions ExifTool: Complex expression evaluation like “int(($val{0}+15)/16)” Reference: third-party/exiftool/lib/Image/ExifTool/Canon.pm:4480

pub fn set_val(&mut self, index: u32, value: DataMemberValue)

Update the $val hash with a new value