Module parser 

Pest-backed parser with full source-side expression support.

Two public entry points:

• parse_quantity turns a user input like "10 kg*m/s^2", "5 m + 3 ft", or "sqrt(9 m^2)" into a Quantity by parsing it into an [Expr] AST and evaluating under a default EvalContext. This is a thin wrapper around parse_and_eval.
• parse_unit_name takes a bare unit expression like "m/s" or "kg*m/s^2" and resolves it to a composed Unit. Target-side parsing stays pure — no math, no identifiers beyond unit names.

Grammar lives in grammar.pest. Expression grammar is documented there; the AST walker lives in crate::expr and the tree walker / evaluator lives in crate::eval.

Structs

QuantityParser

Enums

Rule

Constants

_PEST_GRAMMAR_QuantityParser 🔒

Functions

check_affine_composition 🔒

Check that neither operand is affine before composing.

parse_and_eval

Parse an expression and evaluate it under a caller-provided context.

parse_quantity

Parse a full quantity string and evaluate it under a default context.

parse_unit_name

Parse a bare unit expression (e.g. "m/s", "kg*m/s^2").

resolve_unit_expr 🔒

Recursively resolve a pest unit_expr parse tree into a composed Unit.