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// Copyright (C) 2020-2025 Free Software Foundation, Inc.
// This file is part of GCC.
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include "rust-system.h"
#include "rust-token.h"
#include "rust-diagnostics.h"
#include "rust-unicode.h"
namespace Rust {
// Hackily defined way to get token description for enum value using x-macros
const char *
get_token_description (TokenId id)
{
switch (id)
{
#define RS_TOKEN(name, descr) \
case name: \
return descr;
#define RS_TOKEN_KEYWORD_2015(x, y) RS_TOKEN (x, y)
#define RS_TOKEN_KEYWORD_2018 RS_TOKEN_KEYWORD_2015
RS_TOKEN_LIST
#undef RS_TOKEN_KEYWORD_2015
#undef RS_TOKEN_KEYWORD_2018
#undef RS_TOKEN
default:
rust_unreachable ();
}
}
/* Hackily defined way to get token description as a string for enum value using
* x-macros */
const char *
token_id_to_str (TokenId id)
{
switch (id)
{
#define RS_TOKEN(name, _) \
case name: \
return #name;
#define RS_TOKEN_KEYWORD_2015(x, y) RS_TOKEN (x, y)
#define RS_TOKEN_KEYWORD_2018 RS_TOKEN_KEYWORD_2015
RS_TOKEN_LIST
#undef RS_TOKEN_KEYWORD_2015
#undef RS_TOKEN_KEYWORD_2018
#undef RS_TOKEN
default:
rust_unreachable ();
}
}
/* checks if a token is a keyword */
bool
token_id_is_keyword (TokenId id)
{
switch (id)
{
#define RS_TOKEN_KEYWORD_2015(name, _) case name:
#define RS_TOKEN_KEYWORD_2018 RS_TOKEN_KEYWORD_2015
#define RS_TOKEN(a, b)
RS_TOKEN_LIST return true;
#undef RS_TOKEN_KEYWORD_2015
#undef RS_TOKEN_KEYWORD_2018
#undef RS_TOKEN
default:
return false;
}
}
/* gets the string associated with a keyword */
const std::string &
token_id_keyword_string (TokenId id)
{
switch (id)
{
#define RS_TOKEN_KEYWORD_2015(id, str_ptr) \
case id: { \
static const std::string str (str_ptr); \
return str; \
} \
rust_unreachable ();
#define RS_TOKEN_KEYWORD_2018 RS_TOKEN_KEYWORD_2015
#define RS_TOKEN(a, b)
RS_TOKEN_LIST
#undef RS_TOKEN_KEYWORD_2015
#undef RS_TOKEN_KEYWORD_2018
#undef RS_TOKEN
default:
rust_unreachable ();
}
}
const char *
get_type_hint_string (PrimitiveCoreType type)
{
switch (type)
{
case CORETYPE_BOOL:
return "bool";
case CORETYPE_CHAR:
return "char";
case CORETYPE_STR:
return "str";
// case CORETYPE_INT:
case CORETYPE_ISIZE:
return "isize";
// case CORETYPE_UINT:
case CORETYPE_USIZE:
return "usize";
case CORETYPE_F32:
return "f32";
case CORETYPE_F64:
return "f64";
case CORETYPE_I8:
return "i8";
case CORETYPE_I16:
return "i16";
case CORETYPE_I32:
return "i32";
case CORETYPE_I64:
return "i64";
case CORETYPE_I128:
return "i128";
case CORETYPE_U8:
return "u8";
case CORETYPE_U16:
return "u16";
case CORETYPE_U32:
return "u32";
case CORETYPE_U64:
return "u64";
case CORETYPE_U128:
return "u128";
case CORETYPE_PURE_DECIMAL:
return "pure_decimal";
case CORETYPE_UNKNOWN:
default:
return "unknown";
}
}
const char *
Token::get_type_hint_str () const
{
return get_type_hint_string (type_hint);
}
std::string
nfc_normalize_token_string (location_t loc, TokenId id, const std::string &str)
{
if (id == IDENTIFIER || id == LIFETIME)
{
tl::optional<Utf8String> ustring = Utf8String::make_utf8_string (str);
if (ustring.has_value ())
return ustring.value ().nfc_normalize ().as_string ();
else
rust_internal_error_at (loc,
"identifier '%s' is not a valid UTF-8 string",
str.c_str ());
}
else
return str;
}
const std::string &
Token::get_str () const
{
if (token_id_is_keyword (token_id))
return token_id_keyword_string (token_id);
// FIXME: attempt to return null again
// gcc_assert(str != NULL);
// HACK: allow referencing an empty string
static const std::string empty = "";
if (str == NULL)
{
rust_error_at (get_locus (),
"attempted to get string for %qs, which has no string. "
"returning empty string instead",
get_token_description ());
return empty;
}
return *str;
}
namespace {
enum class Context
{
String,
Char
};
const std::map<char, std::string> matches = {
{'\t', "\\t"}, {'\n', "\\n"}, {'\r', "\\r"},
{'\0', "\\0"}, {'\\', "\\\\"}, {'\v', "\\v"},
};
std::string
escape_special_chars (const std::string &source, Context ctx)
{
std::stringstream stream;
decltype (matches)::const_iterator result;
for (char c : source)
{
// FIXME: #2411 Also replace escaped unicode values and \x digits
if ((result = matches.find (c)) != matches.end ())
stream << result->second;
else if (c == '\'' && ctx == Context::Char)
stream << "\\'";
else if (c == '"' && ctx == Context::String)
stream << "\\\"";
else
stream << c;
}
return stream.str ();
}
} // namespace
std::string
Token::as_string () const
{
if (should_have_str ())
{
switch (get_id ())
{
case STRING_LITERAL:
return "\"" + escape_special_chars (get_str (), Context::String)
+ "\"";
case BYTE_STRING_LITERAL:
return "b\"" + escape_special_chars (get_str (), Context::String)
+ "\"";
case RAW_STRING_LITERAL:
return "r\"" + escape_special_chars (get_str (), Context::String)
+ "\"";
case CHAR_LITERAL:
return "'" + escape_special_chars (get_str (), Context::Char) + "'";
case BYTE_CHAR_LITERAL:
return "b'" + escape_special_chars (get_str (), Context::Char) + "'";
case LIFETIME:
return "'" + get_str ();
case SCOPE_RESOLUTION:
return "::";
case INT_LITERAL:
if (get_type_hint () == CORETYPE_UNKNOWN)
return get_str ();
else
return get_str () + get_type_hint_str ();
case FLOAT_LITERAL:
if (get_type_hint () == CORETYPE_UNKNOWN)
return get_str ();
else
return get_str () + get_type_hint_str ();
default:
return get_str ();
}
}
else
{
return get_token_description ();
}
}
} // namespace Rust
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