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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);
AST::Path Parse_PathFrom(TokenStream& lex, AST::Path path, eParsePathGenericMode generic_mode);
::std::vector<TypeRef> Parse_Path_GenericList(TokenStream& lex);
AST::Path Parse_Path(TokenStream& lex, eParsePathGenericMode generic_mode)
{
Token tok;
switch( GET_TOK(tok, lex) )
{
case TOK_DOUBLE_COLON:
return Parse_Path(lex, true, generic_mode);
case TOK_LT: {
TypeRef ty = Parse_Type(lex);
TypeRef trait;
if( GET_TOK(tok, lex) == TOK_RWORD_AS ) {
trait = Parse_Type(lex);
}
else
lex.putback(tok);
GET_CHECK_TOK(tok, lex, TOK_GT);
// TODO: Terminating the "path" here is sometimes valid
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
return Parse_PathFrom(lex, AST::Path(AST::Path::TagUfcs(), ty, trait), PATH_GENERIC_EXPR);
}
default:
lex.putback(tok);
return Parse_Path(lex, false, generic_mode);
}
}
AST::Path Parse_Path(TokenStream& lex, bool is_abs, eParsePathGenericMode generic_mode)
{
if( is_abs )
{
Token tok;
if( GET_TOK(tok, lex) == TOK_STRING ) {
::std::string cratename = tok.str();
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
return Parse_PathFrom(lex, AST::Path(cratename, {}), generic_mode);
}
else {
lex.putback(tok);
return Parse_PathFrom(lex, AST::Path(AST::Path::TagAbsolute()), generic_mode);
}
}
else
return Parse_PathFrom(lex, AST::Path(), generic_mode);
}
AST::Path Parse_PathFrom(TokenStream& lex, AST::Path path, eParsePathGenericMode generic_mode)
{
TRACE_FUNCTION_F("path = " << path);
Token tok;
tok = lex.getToken();
while(true)
{
::std::vector<TypeRef> params;
CHECK_TOK(tok, TOK_IDENT);
::std::string component = 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);
tok = lex.getToken();
}
// HACK - 'Fn*(...) -> ...' notation
else if( tok.type() == TOK_PAREN_OPEN )
{
DEBUG("Fn() hack");
::std::vector<TypeRef> args;
if( GET_TOK(tok, lex) == TOK_PAREN_CLOSE )
{
// Empty list
}
else
{
lex.putback(tok);
do {
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() );
if( GET_TOK(tok, lex) == TOK_THINARROW ) {
ret_type = Parse_Type(lex);
}
else {
lex.putback(tok);
}
DEBUG("- Fn("<<args<<")->"<<ret_type<<"");
// Encode into path, by converting Fn(A,B)->C into Fn<(A,B),Ret=C>
params = ::std::vector<TypeRef> { TypeRef(TypeRef::TagTuple(), ::std::move(args)) };
// TODO: Use 'ret_type' as an associated type bound
GET_TOK(tok, lex);
}
else
{
}
}
if( tok.type() != TOK_DOUBLE_COLON ) {
path.append( AST::PathNode(component, 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);
tok = lex.getToken();
if( tok.type() != TOK_DOUBLE_COLON ) {
path.append( AST::PathNode(component, params) );
break;
}
GET_TOK(tok, lex);
}
path.append( AST::PathNode(component, params) );
}
lex.putback(tok);
DEBUG("path = " << path);
return path;
}
/// Parse a list of parameters within a path
::std::vector<TypeRef> Parse_Path_GenericList(TokenStream& lex)
{
TRACE_FUNCTION;
Token tok;
::std::vector<TypeRef> types;
::std::vector< ::std::string> lifetimes;
::std::map< ::std::string, TypeRef> assoc_bounds;
::std::vector<unsigned int> int_args;
do {
switch(GET_TOK(tok, lex))
{
case TOK_LIFETIME:
lifetimes.push_back( tok.str() );
break;
case TOK_IDENT:
if( LOOK_AHEAD(lex) == TOK_EQUAL )
{
::std::string name = tok.str();
GET_CHECK_TOK(tok, lex, TOK_EQUAL);
assoc_bounds.insert( ::std::make_pair( ::std::move(name), Parse_Type(lex) ) );
break;
}
default:
lex.putback(tok);
types.push_back( Parse_Type(lex) );
break;
}
} while( GET_TOK(tok, lex) == TOK_COMMA );
// HACK: Split >> into >
if(tok.type() == TOK_DOUBLE_GT) {
lex.putback(Token(TOK_GT));
}
else {
CHECK_TOK(tok, TOK_GT);
}
// TODO: Actually use the lifetimes/assoc_bounds
return types;
}
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