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//! Macro conversion helpers for expression generation
//!
//! Handles conversion of Windjammer function calls to Rust macros:
//! - Test macros (assert, assert_eq, panic, etc.)
//! - Test runtime functions (assert_gt, assert_contains, etc.)
//! - Print macros (print, println, eprintln, eprint)
//!
//! Philosophy: Windjammer code uses function-call syntax for ergonomics,
//! but the compiler converts them to Rust macros when appropriate.
use crate::parser::{BinaryOp, Expression, Literal};
use super::{string_analysis, CodeGenerator};
impl<'ast> CodeGenerator<'ast> {
pub(in crate::codegen::rust) fn try_generate_test_macro(
&mut self,
func_name: &str,
arguments: &[(Option<String>, &Expression<'ast>)],
) -> Option<String> {
// Test macros that Windjammer converts to Rust macros
let test_macros = [
"assert",
"assert_eq",
"assert_ne",
"assert_ok",
"assert_err",
"panic",
"vec",
"format",
"write",
"writeln",
"dbg",
"todo",
"unimplemented",
"unreachable",
];
if !test_macros.contains(&func_name) {
return None;
}
// Rust 2021: panic!(format!("...", args)) is invalid because
// panic! requires a string literal as first arg.
// Unwrap: panic(format!("...", a, b)) → panic!("...", a, b)
if func_name == "panic" && arguments.len() == 1 {
if let Expression::MacroInvocation {
name: ref inner_name,
args: ref inner_args,
..
} = arguments[0].1
{
if inner_name == "format" {
let mut inner: Vec<String> = Vec::with_capacity(inner_args.len());
if !inner_args.is_empty() {
inner.push(self.format_macro_template_arg(inner_args[0]));
for a in inner_args.iter().skip(1) {
inner.push(self.generate_expression(a));
}
}
return Some(format!("panic!({})", inner.join(", ")));
}
}
}
let args: Vec<String> = if func_name == "format" && !arguments.is_empty() {
let mut out = Vec::with_capacity(arguments.len());
out.push(self.format_macro_template_arg(arguments[0].1));
for (_label, arg) in arguments.iter().skip(1) {
out.push(self.generate_expression(arg));
}
out
} else {
arguments
.iter()
.map(|(_label, arg)| {
let generated = self.generate_expression(arg);
// Deref borrowed Copy params in assert_eq!/assert_ne!
// to avoid E0277 (&i32 != i32 for PartialEq)
if matches!(func_name, "assert_eq" | "assert_ne") {
if let Expression::Identifier { name, .. } = arg {
if self.inferred_borrowed_params.contains(name.as_str()) {
let param_type = self
.current_function_params
.iter()
.find(|p| p.name == *name)
.map(|p| &p.type_);
let is_copy_ref = param_type.is_some_and(|t| {
matches!(t, crate::parser::Type::Reference(inner)
if self.is_type_copy(inner))
});
if is_copy_ref {
return format!("*{}", generated);
}
}
}
}
generated
})
.collect()
};
Some(format!("{}!({})", func_name, args.join(", ")))
}
/// Try to qualify test assertion runtime functions
/// Returns Some(code) if this is a test runtime function, None otherwise
pub(in crate::codegen::rust) fn try_qualify_test_function(
&mut self,
func_name: &str,
arguments: &[(Option<String>, &Expression<'ast>)],
) -> Option<String> {
// Test runtime functions that need windjammer_runtime::test:: qualification
let test_functions = [
"assert_gt",
"assert_lt",
"assert_gte",
"assert_lte",
"assert_approx",
"assert_not_empty",
"assert_empty",
"assert_contains",
"assert_is_some",
"assert_is_none",
];
if !test_functions.contains(&func_name) {
return None;
}
let args: Vec<String> = arguments
.iter()
.enumerate()
.map(|(idx, (_label, arg))| {
let generated = self.generate_expression(arg);
// assert_is_some and assert_is_none expect &Option, so add & for first arg
if (func_name == "assert_is_some" || func_name == "assert_is_none") && idx == 0 {
format!("&{}", generated)
} else {
generated
}
})
.collect();
Some(format!(
"windjammer_runtime::test::{}({})",
func_name,
args.join(", ")
))
}
/// Try to convert print/println/eprintln/eprint to macros
/// Returns Some(code) if this is a print function, None otherwise
pub(in crate::codegen::rust) fn try_generate_print_macro(
&mut self,
func_name: &str,
arguments: &[(Option<String>, &Expression<'ast>)],
) -> Option<String> {
// Print functions that convert to macros
if !matches!(func_name, "print" | "println" | "eprintln" | "eprint") {
return None;
}
// For print() -> println!(), otherwise keep the same name
let target_macro = if func_name == "print" {
"println"
} else {
func_name
};
// Check if the first argument is a format! macro (from string interpolation)
if let Some((_, first_arg)) = arguments.first() {
// Check for MacroInvocation (explicit format! calls)
if let Expression::MacroInvocation {
is_repeat: _,
ref name,
args: ref macro_args,
..
} = **first_arg
{
if name == "format" && !macro_args.is_empty() {
// Unwrap the format! call and put its arguments directly into println!
// format!("text {}", var) -> println!("text {}", var)
let format_str = self.format_macro_template_arg(macro_args[0]);
let format_args: Vec<String> = macro_args[1..]
.iter()
.map(|arg| self.generate_expression(arg))
.collect();
let args_str = if format_args.is_empty() {
String::new()
} else {
format!(", {}", format_args.join(", "))
};
return Some(format!("{}!({}{})", target_macro, format_str, args_str));
}
}
// Check for Binary expression with string concatenation (will become format!)
if let Expression::Binary {
left,
op: BinaryOp::Add,
right,
..
} = **first_arg
{
// Check if this is string concatenation
let has_string_literal = matches!(
left,
Expression::Literal {
value: Literal::String(_),
..
}
) || matches!(
right,
Expression::Literal {
value: Literal::String(_),
..
}
) || string_analysis::contains_string_literal(left)
|| string_analysis::contains_string_literal(right);
if has_string_literal {
// Collect all parts of the concatenation
let mut parts = Vec::new();
string_analysis::collect_concat_parts_static(left, &mut parts);
string_analysis::collect_concat_parts_static(right, &mut parts);
// Generate format string and arguments
let format_str = "{}".repeat(parts.len());
let format_args: Vec<String> = parts
.iter()
.map(|expr| self.generate_expression(expr))
.collect();
return Some(format!(
"{}!(\"{}\", {})",
target_macro,
format_str,
format_args.join(", ")
));
}
}
}
// No interpolation, just regular print
// TDD FIX: Auto-format non-string arguments
// println(value) where value: bool → println!("{}", value)
// println("text") → println!("text") (string literals stay as-is)
let args: Vec<String> = arguments
.iter()
.map(|(_label, arg)| self.generate_expression(arg))
.collect();
// Check if first argument is a string literal
let first_arg_is_string_literal = arguments
.first()
.map(|(_, arg)| {
matches!(
arg,
Expression::Literal {
value: Literal::String(_),
..
}
)
})
.unwrap_or(false);
if args.len() == 1 && !first_arg_is_string_literal {
// Single non-string argument - format it
Some(format!("{}!(\"{{}}\", {})", target_macro, args[0]))
} else {
// Multiple args or string literal - keep as-is
Some(format!("{}!({})", target_macro, args.join(", ")))
}
}
}