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/*
*/
#include <synext_macro.hpp>
#include "../parse/common.hpp"
#include "../parse/parseerror.hpp"
#include "../parse/tokentree.hpp"
#include "../parse/lex.hpp"
#include <ast/crate.hpp> // for m_load_std
namespace {
struct FmtArgs
{
enum class Align {
Unspec,
Left,
Center,
Right,
};
enum class Sign {
Unspec,
Plus,
Minus,
};
Align align = Align::Unspec;
char align_char = ' ';
Sign sign = Sign::Unspec;
bool alternate = false;
bool zero_pad = false;
bool width_is_arg = false;
unsigned int width = 0;
bool prec_is_arg = false;
unsigned int prec = 0;
};
struct FmtFrag
{
::std::string leading_text;
unsigned int arg_index;
const char* trait_name;
// TODO: Support case where this hasn't been edited (telling the formatter that it has nothing to apply)
FmtArgs args;
};
::std::tuple< ::std::vector<FmtFrag>, ::std::string> parse_format_string(const Span& sp, const ::std::string& format_string, const ::std::map< ::std::string,unsigned int>& named, unsigned int n_free)
{
unsigned int n_named = named.size();
unsigned int next_free = 0;
::std::vector<FmtFrag> frags;
::std::string cur_literal;
const char* s = format_string.c_str();
for( ; *s; s ++)
{
if( *s != '{' )
{
if( *s == '}' ) {
s ++;
if( *s != '}' )
ERROR(sp, E0000, "'}' must be escaped as '}}' in format strings");
// - fall with *s == '}'
}
cur_literal += *s;
}
else
{
s ++;
if( *s == '{' ) {
cur_literal += '{';
continue ;
}
unsigned int index = ~0u;
const char* trait_name;
FmtArgs args;
// Formatting parameter
if( *s != ':' && *s != '}' ) {
// Parse either an integer or an identifer
TODO(sp, "Parse named/positional formatting fragment at \"" << s);
}
else {
// Leave (for now)
// - If index is ~0u at the end of this block, it's set to the next arg
// - This allows {:.*} to format correctly (taking <prec> then <arg>)
}
// If next character is ':', parse extra information
if( *s == ':' ) {
s ++; // eat ':'
// Alignment
if( s[0] != '\0' && (s[1] == '<' || s[1] == '^' || s[1] == '>') ) {
args.align_char = s[0];
s ++;
}
if( *s == '<' ) {
args.align = FmtArgs::Align::Left;
s ++;
}
else if( *s == '^' ) {
args.align = FmtArgs::Align::Center;
s ++;
}
else if( *s == '>' ) {
args.align = FmtArgs::Align::Right;
s ++;
}
else {
//args.align = FmtArgs::Align::Unspec;
}
// Sign
if( *s == '+' ) {
args.sign = FmtArgs::Sign::Plus;
s ++;
}
else if( *s == '-' ) {
args.sign = FmtArgs::Sign::Minus;
s ++;
}
else {
args.sign = FmtArgs::Sign::Unspec;
}
if( *s == '#' ) {
args.alternate = true;
s ++;
}
else {
//args.alternate = false;
}
if( *s == '0' ) {
args.zero_pad = true;
s ++;
}
else {
//args.zero_pad = false;
}
// Padded width
if( ::std::isdigit(*s) /*|| *s == '*'*/ ) {
unsigned int val = 0;
while( ::std::isdigit(*s) )
{
val *= 10;
val += *s - '0';
s ++;
}
args.width = val;
if( *s == '$' ) {
args.width_is_arg = true;
s ++;
}
else {
//args.width_is_arg = false;
}
}
// Precision
if( *s == '.' ) {
s ++;
// '*' - Use next argument
if( *s == '*' ) {
args.prec_is_arg = true;
if( next_free == n_free ) {
ERROR(sp, E0000, "Not enough arguments passed, expected at least " << n_free+1);
}
args.prec = next_free + n_named;
next_free ++;
}
else {
unsigned int val = 0;
while( ::std::isdigit(*s) )
{
val *= 10;
val += *s - '0';
s ++;
}
args.prec = val;
if( *s == '$' ) {
args.prec_is_arg = true;
s ++;
}
else {
//args.prec_is_arg = false;
}
}
}
// Parse ident?
// - Lazy way is to just handle a single char and ensure that it is just a single char
if( s[0] != '}' && s[0] != '\0' && s[1] != '}' ) {
TODO(sp, "Parse formatting fragment at \"" << s << "\" (long type)");
}
switch(s[0])
{
case '\0':
ERROR(sp, E0000, "Unexpected end of formatting string");
default:
ERROR(sp, E0000, "Unknown formatting type specifier '" << *s << "'");
case '}': trait_name = "Display"; break;
case '?': s++; trait_name = "Debug" ; break;
case 'b': s++; trait_name = "Binary"; break;
case 'o': s++; trait_name = "Octal" ; break;
case 'x': s++; trait_name = "LowerHex"; break;
case 'X': s++; trait_name = "UpperHex"; break;
case 'p': s++; trait_name = "Pointer" ; break;
case 'e': s++; trait_name = "LowerExp"; break;
case 'E': s++; trait_name = "UpperExp"; break;
}
assert(*s == '}');
}
else {
if( *s != '}' )
ERROR(sp, E0000, "Malformed formatting fragment, unexpected " << *s);
// Otherwise, it's just a trivial Display call
trait_name = "Display";
}
// Set index if unspecified
if( index == ~0u )
{
if( next_free == n_free ) {
ERROR(sp, E0000, "Not enough arguments passed, expected at least " << n_free+1);
}
index = next_free + n_named;
next_free ++;
}
frags.push_back( FmtFrag {
mv$(cur_literal),
index, trait_name,
mv$(args)
});
}
}
return ::std::make_tuple( mv$(frags), mv$(cur_literal) );
}
}
class CFormatArgsExpander:
public ExpandProcMacro
{
bool expand_early() const override { return true; }
::std::unique_ptr<TokenStream> expand(const Span& sp, const ::AST::Crate& crate, const ::std::string& ident, const TokenTree& tt, AST::Module& mod) override
{
Token tok;
auto lex = TTStream(tt);
if( ident != "" )
ERROR(sp, E0000, "format_args! doesn't take an ident");
auto n = Parse_ExprVal(lex);
auto format_string = dynamic_cast<AST::ExprNode_String&>(*n).m_value;
::std::map< ::std::string, unsigned int> named_args_index;
::std::vector<TokenTree> named_args;
::std::vector<TokenTree> free_args;
// - Parse the arguments
while( GET_TOK(tok, lex) == TOK_COMMA )
{
// - Named parameters
if( lex.lookahead(0) == TOK_IDENT && lex.lookahead(1) == TOK_EQUAL )
{
GET_CHECK_TOK(tok, lex, TOK_IDENT);
auto name = mv$(tok.str());
GET_CHECK_TOK(tok, lex, TOK_EQUAL);
auto expr_tt = Parse_TT_Expr(lex);
auto ins_rv = named_args_index.insert( ::std::make_pair(mv$(name), named_args.size()) );
if( ins_rv.second == false ) {
ERROR(sp, E0000, "Duplicate definition of named argument `" << ins_rv.first->first << "`");
}
named_args.push_back( mv$(expr_tt) );
}
// - Free parameters
else
{
auto expr_tt = Parse_TT_Expr(lex);
free_args.push_back( mv$(expr_tt) );
}
}
// - Parse the format string
::std::vector< FmtFrag> fragments;
::std::string tail;
::std::tie( fragments, tail ) = parse_format_string(sp, format_string, named_args_index, free_args.size());
// TODO: Properly expand format_args! (requires mangling to fit ::core::fmt::rt::v1)
// - For now, just emits the text with no corresponding format fragments
::std::vector<TokenTree> toks;
{
// TODO: Figure out what path to use (::fmt, ::core::fmt, or ::std::fmt)
switch(crate.m_load_std)
{
case ::AST::Crate::LOAD_NONE:
break;
case ::AST::Crate::LOAD_CORE:
toks.push_back( TokenTree(TOK_DOUBLE_COLON) );
toks.push_back( Token(TOK_STRING, "core") );
break;
case ::AST::Crate::LOAD_STD:
toks.push_back( TokenTree(TOK_DOUBLE_COLON) );
toks.push_back( Token(TOK_IDENT, "std") );
break;
}
toks.push_back( TokenTree(TOK_DOUBLE_COLON) );
toks.push_back( Token(TOK_IDENT, "fmt") );
toks.push_back( TokenTree(TOK_DOUBLE_COLON) );
toks.push_back( Token(TOK_IDENT, "Arguments") );
toks.push_back( TokenTree(TOK_DOUBLE_COLON) );
toks.push_back( Token(TOK_IDENT, "new_v1") );
toks.push_back( TokenTree(TOK_PAREN_OPEN) );
{
toks.push_back( TokenTree(TOK_AMP) );
toks.push_back( TokenTree(TOK_SQUARE_OPEN) );
for(const auto& frag : fragments ) {
toks.push_back( Token(TOK_STRING, frag.leading_text) );
toks.push_back( TokenTree(TOK_COMMA) );
}
toks.push_back( TokenTree(TOK_SQUARE_CLOSE) );
toks.push_back( TokenTree(TOK_COMMA) );
toks.push_back( TokenTree(TOK_AMP) );
toks.push_back( TokenTree(TOK_SQUARE_OPEN) );
toks.push_back( TokenTree(TOK_SQUARE_CLOSE) );
}
toks.push_back( TokenTree(TOK_PAREN_CLOSE) );
}
return box$( TTStreamO(TokenTree(mv$(toks))) );
}
};
STATIC_MACRO("format_args", CFormatArgsExpander);
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