site

Julia

struct Site
Site(expr::EarthSciAST.ASTExpr, key::String, name::String, rank::Int64)
Site(expr, key, name, rank)
Site(e::EarthSciAST.ASTExpr)

Site(expr)

The thing a scalar derivative is taken with respect to: a bare VarExpr (scalar variable) or an index(v, i…) node (one symbolic cell of an array variable). Two nodes denote the same site iff their canonical JSON agrees — d/d(u[i+1,j]) treats index(u, +(i,1), j) and index(u, +(1,i), j) as the same site because canonicalization sorts commutative arguments.

name/rank are a PREFILTER cached off expr, not extra identity: the site reads variable name at rank subscripts (rank == -1 for a bare VarExpr, -2 for a shape this fast path does not describe, which then falls back to the plain key compare). See is_site for why.

Source

Python

class Site
Site(expr: Expr, key: str)
@staticmethod Site.of(e: Expr) -> 'Site'

A bare variable reference or one symbolic index(v, i…) cell.

Source

Rust

pub struct Site {
    pub expr: Expr,
    pub key: String,
}

impl Site { pub fn of(e: &Expr) -> Site }

A bare variable reference or one symbolic index(v, i…) cell.

Source · Rust docs