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// file : libbuild2/token.hxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef LIBBUILD2_TOKEN_HXX
#define LIBBUILD2_TOKEN_HXX
#include <libbuild2/types.hxx>
#include <libbuild2/utility.hxx>
#include <libbuild2/diagnostics.hxx>
#include <libbuild2/export.hxx>
namespace build2
{
// Extendable/inheritable enum-like class.
//
// A line consists of a sequence of words separated by separators and
// terminated with the newline. If whitespace is a separator, then it is
// ignored.
//
struct token_type
{
enum
{
// NOTE: remember to update token_printer()!
eos,
newline,
word,
pair_separator, // token::value[0] is the pair separator char.
colon, // :
dollar, // $
question, // ?
comma, // ,
lparen, // (
rparen, // )
lcbrace, // {
rcbrace, // }
lsbrace, // [
rsbrace, // ]
labrace, // <
rabrace, // >
assign, // =
prepend, // =+
append, // +=
equal, // ==
not_equal, // !=
less, // <
greater, // >
less_equal, // <=
greater_equal, // >=
bit_or, // |
log_or, // ||
log_and, // &&
log_not, // !
value_next
};
using value_type = uint16_t;
token_type (value_type v = eos): v_ (v) {}
operator value_type () const {return v_;}
value_type v_;
};
// Token can be unquoted, single-quoted ('') or double-quoted (""). It can
// also be mixed.
//
enum class quote_type {unquoted, single, double_, mixed};
class token;
LIBBUILD2_SYMEXPORT void
token_printer (ostream&, const token&, bool);
class token
{
public:
using printer_type = void (ostream&, const token&, bool diag);
token_type type;
bool separated; // Whitespace-separated from the previous token.
// Quoting can be complete, where the token starts and ends with the quote
// characters and quoting is contiguous or partial where only some part(s)
// of the token are quoted or quoting continus to the next token.
//
quote_type qtype;
bool qcomp;
// Normally only used for word, but can also be used to store "modifiers"
// or some such for other tokens.
//
string value;
uint64_t line;
uint64_t column;
printer_type* printer;
public:
token ()
: token (token_type::eos, false, 0, 0, token_printer) {}
token (token_type t, bool s, uint64_t l, uint64_t c, printer_type* p)
: token (t, string (), s, quote_type::unquoted, false, l, c, p) {}
token (token_type t, bool s,
quote_type qt,
uint64_t l, uint64_t c,
printer_type* p)
: token (t, string (), s, qt, qt != quote_type::unquoted, l, c, p) {}
token (string v, bool s,
quote_type qt, bool qc,
uint64_t l, uint64_t c)
: token (token_type::word, move (v), s, qt, qc, l, c, &token_printer){}
token (token_type t,
string v, bool s,
quote_type qt, bool qc,
uint64_t l, uint64_t c,
printer_type* p)
: type (t), separated (s),
qtype (qt), qcomp (qc),
value (move (v)),
line (l), column (c),
printer (p) {}
};
// Output the token value in a format suitable for diagnostics.
//
inline ostream&
operator<< (ostream& o, const token& t) {t.printer (o, t, true); return o;}
// Extendable/inheritable enum-like class.
//
struct lexer_mode_base
{
enum { value_next };
using value_type = uint16_t;
lexer_mode_base (value_type v = value_next): v_ (v) {}
operator value_type () const {return v_;}
value_type v_;
};
struct replay_token
{
build2::token token;
const path* file;
lexer_mode_base mode;
using location_type = build2::location;
location_type
location () const {return location_type (file, token.line, token.column);}
};
using replay_tokens = vector<replay_token>;
// Diagnostics plumbing. We assume that any diag stream for which we can use
// token as location has its aux data pointing to pointer to path.
//
inline location
get_location (const token& t, const path& p)
{
return location (&p, t.line, t.column);
}
inline location
get_location (const token& t, const void* data)
{
assert (data != nullptr); // E.g., must be &parser::path_.
const path* p (*static_cast<const path* const*> (data));
return get_location (t, *p);
}
}
#endif // LIBBUILD2_TOKEN_HXX
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