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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* parse/paths.cpp
* - Parsing for module paths
*/
#include "parseerror.hpp"
#include "common.hpp"
#include "../ast/ast.hpp"
AST::Path Parse_Path(TokenStream& lex, eParsePathGenericMode generic_mode);
AST::Path Parse_Path(TokenStream& lex, bool is_abs, eParsePathGenericMode generic_mode);
::std::vector<AST::PathNode> Parse_PathNodes(TokenStream& lex, eParsePathGenericMode generic_mode);
AST::PathParams Parse_Path_GenericList(TokenStream& lex);
AST::Path Parse_Path(TokenStream& lex, eParsePathGenericMode generic_mode)
{
TRACE_FUNCTION_F("generic_mode="<<generic_mode);
Token tok;
switch( GET_TOK(tok, lex) )
{
case TOK_INTERPOLATED_PATH:
return mv$(tok.frag_path());
case TOK_RWORD_SELF:
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
return AST::Path(AST::Path::TagSelf(), Parse_PathNodes(lex, generic_mode));
case TOK_RWORD_SUPER: {
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
unsigned int count = 1;
while( LOOK_AHEAD(lex) == TOK_RWORD_SUPER ) {
count += 1;
GET_TOK(tok, lex);
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
}
return AST::Path(AST::Path::TagSuper(), count, Parse_PathNodes(lex, generic_mode));
}
case TOK_RWORD_CRATE:
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
return Parse_Path(lex, true, generic_mode);
case TOK_DOUBLE_COLON:
return Parse_Path(lex, true, generic_mode);
case TOK_DOUBLE_LT:
lex.putback( Token(TOK_LT) );
case TOK_LT: {
TypeRef ty = Parse_Type(lex, true); // Allow trait objects without parens
if( GET_TOK(tok, lex) == TOK_RWORD_AS ) {
::AST::Path trait;
if( GET_TOK(tok, lex) == TOK_DOUBLE_COLON ) {
trait = Parse_Path(lex, true, PATH_GENERIC_TYPE);
}
else {
PUTBACK(tok, lex);
trait = Parse_Path(lex, false, PATH_GENERIC_TYPE);
}
GET_CHECK_TOK(tok, lex, TOK_GT);
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
return AST::Path(AST::Path::TagUfcs(), mv$(ty), mv$(trait), Parse_PathNodes(lex, generic_mode));
}
else {
PUTBACK(tok, lex);
GET_CHECK_TOK(tok, lex, TOK_GT);
// TODO: Terminating the "path" here is sometimes valid?
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
// NOTE: <Foo>::BAR is actually `<Foo as _>::BAR` (in mrustc parleance)
//return AST::Path(AST::Path::TagUfcs(), mv$(ty), Parse_PathNodes(lex, generic_mode));
return AST::Path(AST::Path::TagUfcs(), mv$(ty), AST::Path(), Parse_PathNodes(lex, generic_mode));
}
throw ""; }
default:
PUTBACK(tok, lex);
return Parse_Path(lex, false, generic_mode);
}
}
AST::Path Parse_Path(TokenStream& lex, bool is_abs, eParsePathGenericMode generic_mode)
{
Token tok;
if( is_abs )
{
// QUIRK: `::crate::foo` is valid (semi-surprisingly)
if( LOOK_AHEAD(lex) == TOK_RWORD_CRATE ) {
GET_CHECK_TOK(tok, lex, TOK_RWORD_CRATE);
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
return AST::Path("", Parse_PathNodes(lex, generic_mode));
}
else if( GET_TOK(tok, lex) == TOK_STRING ) {
::std::string cratename = tok.str();
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
return AST::Path(cratename, Parse_PathNodes(lex, generic_mode));
}
else {
PUTBACK(tok, lex);
return AST::Path("", Parse_PathNodes(lex, generic_mode));
}
}
else {
// TODO: TOK_INTERPOLATED_IDENT?
GET_CHECK_TOK(tok, lex, TOK_IDENT);
auto hygine = lex.getHygiene();
DEBUG("hygine = " << hygine);
PUTBACK(tok, lex);
return AST::Path(AST::Path::TagRelative(), mv$(hygine), Parse_PathNodes(lex, generic_mode));
}
}
::std::vector<AST::PathNode> Parse_PathNodes(TokenStream& lex, eParsePathGenericMode generic_mode)
{
TRACE_FUNCTION_F("generic_mode="<<generic_mode);
Token tok;
::std::vector<AST::PathNode> ret;
tok = lex.getToken();
while(true)
{
::AST::PathParams params;
CHECK_TOK(tok, TOK_IDENT);
auto component = mv$( tok.str() );
GET_TOK(tok, lex);
if( generic_mode == PATH_GENERIC_TYPE )
{
if( tok.type() == TOK_LT || tok.type() == TOK_DOUBLE_LT )
{
// HACK! Handle breaking << into < <
if( tok.type() == TOK_DOUBLE_LT )
lex.putback( Token(TOK_LT) );
// Type-mode generics "::path::to::Type<A,B>"
params = Parse_Path_GenericList(lex);
GET_TOK(tok, lex);
}
// HACK - 'Fn*(...) -> ...' notation
else if( tok.type() == TOK_PAREN_OPEN )
{
auto ps = lex.start_span();
DEBUG("Fn() hack");
::std::vector<TypeRef> args;
do {
// Trailing comma or empty list support
if( lex.lookahead(0) == TOK_PAREN_CLOSE ) {
GET_TOK(tok, lex);
break;
}
args.push_back( Parse_Type(lex) );
} while( GET_TOK(tok, lex) == TOK_COMMA );
CHECK_TOK(tok, TOK_PAREN_CLOSE);
TypeRef ret_type = TypeRef( TypeRef::TagUnit(), Span(tok.get_pos()) );
if( GET_TOK(tok, lex) == TOK_THINARROW ) {
ret_type = Parse_Type(lex, false);
}
else {
PUTBACK(tok, lex);
}
DEBUG("- Fn("<<args<<")->"<<ret_type<<"");
// Encode into path, by converting Fn(A,B)->C into Fn<(A,B),Ret=C>
params = ::AST::PathParams {
{},
::make_vec1( TypeRef(TypeRef::TagTuple(), lex.end_span(ps), mv$(args)) ),
::make_vec1( ::std::make_pair( ::std::string("Output"), mv$(ret_type) ) )
};
GET_TOK(tok, lex);
}
else
{
}
}
if( tok.type() != TOK_DOUBLE_COLON ) {
ret.push_back( AST::PathNode(component, mv$(params)) );
break;
}
tok = lex.getToken();
if( generic_mode == PATH_GENERIC_EXPR && (tok.type() == TOK_LT || tok.type() == TOK_DOUBLE_LT) )
{
// HACK! Handle breaking << into < <
if( tok.type() == TOK_DOUBLE_LT )
lex.putback( Token(TOK_LT) );
// Expr-mode generics "::path::to::function::<Type1,Type2>(arg1, arg2)"
params = Parse_Path_GenericList(lex);
if( GET_TOK(tok, lex) != TOK_DOUBLE_COLON ) {
ret.push_back( AST::PathNode(component, mv$(params)) );
// Break out of loop down to return
break;
}
// Match with CHECK_TOK at start of loop
GET_TOK(tok, lex);
}
ret.push_back( AST::PathNode(component, mv$(params)) );
}
PUTBACK(tok, lex);
DEBUG("ret = " << ret);
return ret;
}
/// Parse a list of parameters within a path
::AST::PathParams Parse_Path_GenericList(TokenStream& lex)
{
TRACE_FUNCTION;
Token tok;
::std::vector<TypeRef> types;
::std::vector<AST::LifetimeRef> lifetimes;
::std::vector< ::std::pair< ::std::string, TypeRef > > assoc_bounds;
do {
if( LOOK_AHEAD(lex) == TOK_GT || LOOK_AHEAD(lex) == TOK_DOUBLE_GT || LOOK_AHEAD(lex) == TOK_GTE || LOOK_AHEAD(lex) == TOK_DOUBLE_GT_EQUAL ) {
GET_TOK(tok, lex);
break;
}
switch(GET_TOK(tok, lex))
{
case TOK_LIFETIME:
lifetimes.push_back(AST::LifetimeRef(/*lex.point_span(),*/ lex.get_ident(mv$(tok)) ));
break;
case TOK_IDENT:
if( LOOK_AHEAD(lex) == TOK_EQUAL )
{
::std::string name = mv$(tok.str());
GET_CHECK_TOK(tok, lex, TOK_EQUAL);
assoc_bounds.push_back( ::std::make_pair( mv$(name), Parse_Type(lex,false) ) );
break;
}
default:
PUTBACK(tok, lex);
types.push_back( Parse_Type(lex) );
break;
}
} while( GET_TOK(tok, lex) == TOK_COMMA );
// HACK: Split >> into >
if(tok.type() == TOK_DOUBLE_GT_EQUAL) {
lex.putback(Token(TOK_GTE));
}
else if(tok.type() == TOK_GTE) {
lex.putback(Token(TOK_EQUAL));
}
else if(tok.type() == TOK_DOUBLE_GT) {
lex.putback(Token(TOK_GT));
}
else {
CHECK_TOK(tok, TOK_GT);
}
return ::AST::PathParams {
mv$( lifetimes ),
mv$( types ),
mv$( assoc_bounds )
};
}
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