6a8fecd03e
Cherry-picked and integrated the best code from 105 parallel epic branches into a clean workspace structure: - calcpad-engine/: Core Rust crate with lexer, parser, AST, interpreter, types, FFI (C ABI), pipeline, error handling, span tracking, eval context (from epic/1-5 base) - calcpad-engine/src/number.rs: Arbitrary precision arithmetic via dashu crate, WASM-compatible, exact decimals (from epic/1-4) - calcpad-engine/src/sheet_context.rs: SheetContext with dependency graph, dirty tracking, circular detection, cheap clone (from epic/1-8) - calcpad-wasm/: Thin WASM wrapper crate via wasm-bindgen, delegates to calcpad-engine (from epic/1-6) - Updated .gitignore for target/, node_modules/, build artifacts - Fixed run-pipeline.sh for macOS compat and CalcPad phases 79 tests passing across workspace.
78 lines
2.2 KiB
Rust
78 lines
2.2 KiB
Rust
use crate::types::CalcResult;
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use chrono::NaiveDate;
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use std::collections::HashMap;
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/// Evaluation context holding exchange rates, current date, variables, and other state
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/// needed during interpretation.
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pub struct EvalContext {
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/// Exchange rates relative to USD. Key is currency code (e.g. "EUR"),
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/// value is how many units of that currency per 1 USD.
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pub exchange_rates: HashMap<String, f64>,
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/// The current date for resolving `today`.
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pub today: NaiveDate,
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/// Named variables set via assignment expressions (e.g., `x = 5`).
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pub variables: HashMap<String, CalcResult>,
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}
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impl EvalContext {
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pub fn new() -> Self {
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Self {
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exchange_rates: HashMap::new(),
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today: chrono::Local::now().date_naive(),
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variables: HashMap::new(),
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}
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}
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/// Create a context with a fixed date (useful for testing).
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pub fn with_date(today: NaiveDate) -> Self {
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Self {
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exchange_rates: HashMap::new(),
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today,
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variables: HashMap::new(),
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}
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}
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/// Set exchange rate: 1 USD = `rate` units of `currency`.
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pub fn set_rate(&mut self, currency: &str, rate: f64) {
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self.exchange_rates.insert(currency.to_string(), rate);
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}
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/// Store a variable result.
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pub fn set_variable(&mut self, name: &str, result: CalcResult) {
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self.variables.insert(name.to_string(), result);
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}
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/// Retrieve a variable result.
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pub fn get_variable(&self, name: &str) -> Option<&CalcResult> {
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self.variables.get(name)
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}
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/// Convert `amount` from `from_currency` to `to_currency`.
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/// Returns None if either rate is missing.
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pub fn convert_currency(
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&self,
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amount: f64,
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from_currency: &str,
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to_currency: &str,
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) -> Option<f64> {
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let from_rate = if from_currency == "USD" {
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1.0
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} else {
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*self.exchange_rates.get(from_currency)?
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};
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let to_rate = if to_currency == "USD" {
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1.0
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} else {
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*self.exchange_rates.get(to_currency)?
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};
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let usd_amount = amount / from_rate;
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Some(usd_amount * to_rate)
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}
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}
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impl Default for EvalContext {
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fn default() -> Self {
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Self::new()
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}
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}
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