polserver/pol-core/bscript/compiler/ast/FunctionExpression.cpp
Kevin Eady f381f46dc3
Add compiler support for function expressions (#671)
* initial poc of function expressions
- update grammar
- mock AST builder to return BBoolean(true) for a func expr
- update prettifier for skeleton implementation

* more skeleton work
create AST class FunctionExpression mimicking boolean value

* create ast UserFunction, add to workspace from functexpr

* can generate instructions

* reorg tests; add test for instructions

* can track FunctionDepth in Variable

* can get captures for funcexprs inside funcs.. tbd if this way of nesting works

* Implement create-functor instruction
- Move function depth from Variable to Variables
- Introduce stacking of `Variables` for function expresions via `FunctionVariableScope`
- Add `TOK_FUNCTOR` instruction for 'create-functor'
- Handle emitting a `FunctionExpression` AST node
- Update `emit.declare_variable` and `emit.access_variable` to account for function captures
- Remove `in_function` from instruction generator, as it is tracked via `UserFunction` stack
- Update tests

* Address Discord comments
- Swap pop param order

* Bubble up captured variables through nested functions

* Improve testing infrastructure; add some test cases

* Fix compilation error

* prepend captures to function parameters in funcref mth_call

* update tests

* move from function{} to @{}

* implementation fix

* some more tests

* update docs

* Some cleanup

* fix CI annotation warning
- 'argument': conversion from 'size_t' to 'VariableIndex', possible loss of data

* Address review comments
- Add `passert_always`
- Use better example in docs

* Some cleanup
- Remove unused functions
2024-07-29 22:30:52 +02:00

34 lines
885 B
C++

#include "FunctionExpression.h"
#include <fmt/format.h>
#include "bscript/compiler/ast/NodeVisitor.h"
#include "bscript/compiler/ast/Function.h"
#include "bscript/compiler/model/FunctionLink.h"
namespace Pol::Bscript::Compiler
{
FunctionExpression::FunctionExpression( const SourceLocation& source_location,
std::shared_ptr<FunctionLink> function_link )
: Value( source_location ), function_link( std::move( function_link ) )
{
}
void FunctionExpression::accept( NodeVisitor& visitor )
{
visitor.visit_function_expression( *this );
}
void FunctionExpression::describe_to( std::string& w ) const
{
std::string name;
if ( auto fn = function_link->function() )
name = fn->name;
else
name = "unknown";
fmt::format_to( std::back_inserter( w ), "function-expression({})", name );
}
} // namespace Pol::Bscript::Compiler