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//! Expression-level JavaScript codegen for `JavaScriptGenerator`
use crate::parser::*;
use super::generator::JavaScriptGenerator;
use super::type_conversion::{binary_op_to_js, escape_js_keyword, unary_op_to_js};
impl JavaScriptGenerator {
pub(crate) fn generate_expression(&mut self, expr: &Expression) -> String {
match expr {
Expression::Literal { value: lit, .. } => self.generate_literal(lit),
Expression::Identifier { name: id, .. } => {
// Convert Rust-style path syntax (Type::Variant) to JS dot notation (Type.Variant)
if id.contains("::") {
// TDD FIX: Escape keywords in path components (Type::default → Type.default_)
let parts: Vec<String> = id.split("::").map(escape_js_keyword).collect();
parts.join(".")
} else {
// TDD FIX: Escape JavaScript keywords
// Resolve shadowed variable names first, then escape if needed
let resolved = self.resolve_var(id);
escape_js_keyword(&resolved)
}
}
Expression::Binary {
left, op, right, ..
} => {
format!(
"({} {} {})",
self.generate_expression(left),
binary_op_to_js(op),
self.generate_expression(right)
)
}
Expression::Unary { op, operand, .. } => {
format!(
"({}{})",
unary_op_to_js(op),
self.generate_expression(operand)
)
}
Expression::Call {
function,
arguments,
..
} => {
let func_expr = self.generate_expression(function);
// Handle special functions
match func_expr.as_str() {
"println!" | "println" => {
let args: Vec<String> = arguments
.iter()
.map(|(_, arg)| self.generate_expression(arg))
.collect();
return self.generate_js_println(&args);
}
"print!" | "print" => {
let args: Vec<String> = arguments
.iter()
.map(|(_, arg)| self.generate_expression(arg))
.collect();
return self.generate_js_print(&args);
}
_ => {}
}
let func_expr = if func_expr.ends_with(".new") {
format!("{}.create", &func_expr[..func_expr.len() - 4])
} else if func_expr.ends_with(".new_") {
format!("{}.create", &func_expr[..func_expr.len() - 5])
} else {
func_expr
};
let args: Vec<String> = arguments
.iter()
.map(|(_, arg)| self.generate_expression(arg))
.collect();
format!("{}({})", func_expr, args.join(", "))
}
Expression::MethodCall {
object,
method,
arguments,
..
} => {
let obj = self.generate_expression(object);
let args: Vec<String> = arguments
.iter()
.map(|(_, arg)| self.generate_expression(arg))
.collect();
// Map Windjammer/Rust methods to JS equivalents
match method.as_str() {
"len" => format!("{}.length", obj), // .len() → .length (property, not method)
"is_empty" => format!("{}.length === 0", obj),
"contains" if args.len() == 1 => format!("{}.includes({})", obj, args[0]),
"to_string" => format!("String({})", obj),
_ => format!("{}.{}({})", obj, method, args.join(", ")),
}
}
Expression::FieldAccess { object, field, .. } => {
format!("{}.{}", self.generate_expression(object), field)
}
Expression::StructLiteral { name, fields, .. } => {
let field_strs: Vec<String> = fields
.iter()
.map(|(field_name, expr)| {
format!("{}: {}", field_name, self.generate_expression(expr))
})
.collect();
format!(
"new {}({})",
name,
field_strs
.iter()
.map(|f| { f.split(": ").nth(1).unwrap_or("") })
.collect::<Vec<_>>()
.join(", ")
)
}
Expression::MapLiteral { pairs, .. } => {
// Generate JavaScript object literal: {key: value, ...}
if pairs.is_empty() {
"{}".to_string()
} else {
let entries_str: Vec<String> = pairs
.iter()
.map(|(k, v)| {
let key_str = self.generate_expression(k);
let val_str = self.generate_expression(v);
// If key is a simple identifier or string literal, use it directly
// Otherwise, use computed property: [key]: value
if matches!(
k,
Expression::Literal {
value: Literal::String(_),
..
} | Expression::Identifier { .. }
) {
format!("{}: {}", key_str, val_str)
} else {
format!("[{}]: {}", key_str, val_str)
}
})
.collect();
format!("{{ {} }}", entries_str.join(", "))
}
}
Expression::Index { object, index, .. } => {
format!(
"{}[{}]",
self.generate_expression(object),
self.generate_expression(index)
)
}
Expression::Tuple { elements, .. } => {
let elems: Vec<String> = elements
.iter()
.map(|e| self.generate_expression(e))
.collect();
format!("[{}]", elems.join(", "))
}
Expression::Array { elements, .. } => {
let elems: Vec<String> = elements
.iter()
.map(|e| self.generate_expression(e))
.collect();
format!("[{}]", elems.join(", "))
}
Expression::MacroInvocation { name, args, .. } => {
// Handle common macros
match name.as_str() {
"vec" => {
let elems: Vec<String> =
args.iter().map(|e| self.generate_expression(e)).collect();
format!("[{}]", elems.join(", "))
}
"println" | "print" => {
let args_str: Vec<String> =
args.iter().map(|e| self.generate_expression(e)).collect();
format!("console.log({})", args_str.join(", "))
}
"format" => {
// Convert format!("Hello, {}!", name) → `Hello, ${name}!`
let args_str: Vec<String> =
args.iter().map(|e| self.generate_expression(e)).collect();
if args_str.len() <= 1 {
args_str
.first()
.cloned()
.unwrap_or_else(|| "''".to_string())
} else {
// First arg is the format string (quoted), rest are values
let fmt = &args_str[0];
// Strip quotes from format string
let inner = if (fmt.starts_with('\'') && fmt.ends_with('\''))
|| (fmt.starts_with('"') && fmt.ends_with('"'))
{
&fmt[1..fmt.len() - 1]
} else {
fmt.as_str()
};
// Replace {} placeholders with ${arg} expressions
let mut result = String::new();
let mut arg_idx = 0;
let mut chars = inner.chars().peekable();
while let Some(ch) = chars.next() {
if ch == '{' && chars.peek() == Some(&'}') {
chars.next(); // consume }
if arg_idx + 1 < args_str.len() {
result.push_str(&format!("${{{}}}", args_str[arg_idx + 1]));
arg_idx += 1;
} else {
result.push_str("{}");
}
} else {
result.push(ch);
}
}
format!("`{}`", result)
}
}
_ => format!("/* macro: {}! */", name),
}
}
Expression::Await { expr, .. } => {
format!("await {}", self.generate_expression(expr))
}
Expression::TryOp { expr, .. } => {
// Simplify: just return the expression (proper error handling needs runtime support)
self.generate_expression(expr)
}
Expression::Range {
start,
end,
inclusive,
..
} => {
// Generate array from range
if *inclusive {
format!(
"Array.from({{length: {} - {} + 1}}, (_, i) => {} + i)",
self.generate_expression(end),
self.generate_expression(start),
self.generate_expression(start)
)
} else {
format!(
"Array.from({{length: {} - {}}}, (_, i) => {} + i)",
self.generate_expression(end),
self.generate_expression(start),
self.generate_expression(start)
)
}
}
Expression::Closure {
parameters, body, ..
} => {
format!(
"({}) => {}",
parameters.join(", "),
self.generate_expression(body)
)
}
Expression::Cast { expr, .. } => {
// Just return the expression (JS is dynamically typed)
self.generate_expression(expr)
}
Expression::ChannelSend { channel, value, .. } => {
// Simplified: treat as method call
format!(
"{}.send({})",
self.generate_expression(channel),
self.generate_expression(value)
)
}
Expression::ChannelRecv { channel, .. } => {
format!("{}.receive()", self.generate_expression(channel))
}
Expression::Block { statements, .. } => {
let mut output = String::from("(() => {\n");
self.indent_level += 1;
for stmt in statements {
output.push_str(&self.generate_statement(stmt));
}
self.indent_level -= 1;
output.push_str(&self.indent());
output.push_str("})()");
output
}
}
}
pub(crate) fn generate_literal(&self, lit: &Literal) -> String {
match lit {
Literal::Int(n) | Literal::IntSuffixed(n, _) => n.to_string(),
Literal::Float(f) => f.to_string(),
Literal::String(s) => {
// Check for string interpolation markers (${ or just $ with identifier)
if s.contains("${") || s.contains("$") {
// Use template literal with backticks for interpolation
format!("`{}`", s)
} else {
// Use single quotes for plain strings
format!("'{}'", s.replace('\'', "\\'"))
}
}
Literal::Char(c) => format!("'{}'", c),
Literal::Bool(b) => b.to_string(),
}
}
/// Generate console.log with format string support: println("{}", x) → console.log(`${x}`)
fn generate_js_println(&self, args: &[String]) -> String {
if args.is_empty() {
return "console.log()".to_string();
}
// Check if first arg is a format string (quoted)
let first = &args[0];
if first.starts_with('\'') || first.starts_with('"') {
let unquoted = &first[1..first.len() - 1];
if unquoted.contains("{}") && args.len() > 1 {
// Convert {} placeholders to template literal ${} syntax
let mut template = unquoted.to_string();
for arg in &args[1..] {
template = template.replacen("{}", &format!("${{{}}}", arg), 1);
}
return format!("console.log(`{}`)", template);
}
}
format!("console.log({})", args.join(", "))
}
/// Generate console.log without newline (JS doesn't have print without newline easily)
fn generate_js_print(&self, args: &[String]) -> String {
if args.is_empty() {
return "process.stdout.write('')".to_string();
}
let first = &args[0];
if first.starts_with('\'') || first.starts_with('"') {
let unquoted = &first[1..first.len() - 1];
if unquoted.contains("{}") && args.len() > 1 {
let mut template = unquoted.to_string();
for arg in &args[1..] {
template = template.replacen("{}", &format!("${{{}}}", arg), 1);
}
return format!("process.stdout.write(`{}`)", template);
}
}
format!("process.stdout.write(String({}))", args.join(" + "))
}
}