Struct ArithCompiler 

pub struct ArithCompiler<'a> {
    pub input: &'a str,
    pub pos: usize,
    pub builder: ChunkBuilder,
    pub slots: HashMap<String, u16>,
    pub next_slot: u16,
    pub assigned: HashSet<String>,
}

Arithmetic expression compiler.

Takes a zsh arithmetic expression (the content inside $((...))) and emits fusevm bytecodes that compute the result.

Tokenizer port: same lexer shape as zzlex() / mathlex() from Src/math.c. Emit step: zshrs-original — C zsh evaluates inline via mathevall() (Src/math.c) and has no compile-then-run path.

Fields

input: &'a str

input field.

pos: usize

pos field.

builder: ChunkBuilder

builder field.

slots: HashMap<String, u16>

Variable name → slot index

next_slot: u16

next_slot field.

assigned: HashSet<String>

Names this expression ASSIGNS to (x = …, x += …, x++, --x).

c:Src/math.c:1364-1372 — only an OP_E2/OP_E2IO operator reaches setmathvar; a name that is merely READ never gets written back. compile_arith_str uses this to write back exactly the names C would, instead of every identifier the expression mentions.

Implementations

impl<'a> ArithCompiler<'a>

pub fn new(input: &'a str) -> Self

new — see implementation.

pub fn compile(self) -> Chunk

Compile the arithmetic expression to fusevm bytecodes. Returns the compiled chunk.

pub fn slot_for(&mut self, name: &str) -> u16

pub fn collect_identifiers(&self, expr: &str) -> Vec<String>

Walk the input string and collect all identifier names that appear. Used by compile_arith_inline to pre-load values from executor.variables and to know which slots to write back after. Excludes language keywords and numeric literals.

pub fn expr(&mut self)

expr — see implementation.