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Nix/src/toml11/toml/parser.hpp
Nicolas Mattia c3f68b5db7 Replace cpptoml with toml11
2021-12-17 22:03:33 +01:00

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// Copyright Toru Niina 2017.
// Distributed under the MIT License.
#ifndef TOML11_PARSER_HPP
#define TOML11_PARSER_HPP
#include <cstring>
#include <fstream>
#include <sstream>
#include "combinator.hpp"
#include "lexer.hpp"
#include "region.hpp"
#include "result.hpp"
#include "types.hpp"
#include "value.hpp"
#ifndef TOML11_DISABLE_STD_FILESYSTEM
#ifdef __cpp_lib_filesystem
#if __has_include(<filesystem>)
#define TOML11_HAS_STD_FILESYSTEM
#include <filesystem>
#endif // has_include(<string_view>)
#endif // __cpp_lib_filesystem
#endif // TOML11_DISABLE_STD_FILESYSTEM
namespace toml
{
namespace detail
{
inline result<std::pair<boolean, region>, std::string>
parse_boolean(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_boolean::invoke(loc))
{
const auto reg = token.unwrap();
if (reg.str() == "true") {return ok(std::make_pair(true, reg));}
else if(reg.str() == "false") {return ok(std::make_pair(false, reg));}
else // internal error.
{
throw internal_error(format_underline(
"toml::parse_boolean: internal error",
{{source_location(reg), "invalid token"}}),
source_location(reg));
}
}
loc.reset(first); //rollback
return err(format_underline("toml::parse_boolean: ",
{{source_location(loc), "the next token is not a boolean"}}));
}
inline result<std::pair<integer, region>, std::string>
parse_binary_integer(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_bin_int::invoke(loc))
{
auto str = token.unwrap().str();
assert(str.size() > 2); // minimum -> 0b1
integer retval(0), base(1);
for(auto i(str.rbegin()), e(str.rend() - 2); i!=e; ++i)
{
if (*i == '1'){retval += base; base *= 2;}
else if(*i == '0'){base *= 2;}
else if(*i == '_'){/* do nothing. */}
else // internal error.
{
throw internal_error(format_underline(
"toml::parse_integer: internal error",
{{source_location(token.unwrap()), "invalid token"}}),
source_location(loc));
}
}
return ok(std::make_pair(retval, token.unwrap()));
}
loc.reset(first);
return err(format_underline("toml::parse_binary_integer:",
{{source_location(loc), "the next token is not an integer"}}));
}
inline result<std::pair<integer, region>, std::string>
parse_octal_integer(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_oct_int::invoke(loc))
{
auto str = token.unwrap().str();
str.erase(std::remove(str.begin(), str.end(), '_'), str.end());
str.erase(str.begin()); str.erase(str.begin()); // remove `0o` prefix
std::istringstream iss(str);
integer retval(0);
iss >> std::oct >> retval;
return ok(std::make_pair(retval, token.unwrap()));
}
loc.reset(first);
return err(format_underline("toml::parse_octal_integer:",
{{source_location(loc), "the next token is not an integer"}}));
}
inline result<std::pair<integer, region>, std::string>
parse_hexadecimal_integer(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_hex_int::invoke(loc))
{
auto str = token.unwrap().str();
str.erase(std::remove(str.begin(), str.end(), '_'), str.end());
str.erase(str.begin()); str.erase(str.begin()); // remove `0x` prefix
std::istringstream iss(str);
integer retval(0);
iss >> std::hex >> retval;
return ok(std::make_pair(retval, token.unwrap()));
}
loc.reset(first);
return err(format_underline("toml::parse_hexadecimal_integer",
{{source_location(loc), "the next token is not an integer"}}));
}
inline result<std::pair<integer, region>, std::string>
parse_integer(location& loc)
{
const auto first = loc.iter();
if(first != loc.end() && *first == '0')
{
const auto second = std::next(first);
if(second == loc.end()) // the token is just zero.
{
loc.advance();
return ok(std::make_pair(0, region(loc, first, second)));
}
if(*second == 'b') {return parse_binary_integer (loc);} // 0b1100
if(*second == 'o') {return parse_octal_integer (loc);} // 0o775
if(*second == 'x') {return parse_hexadecimal_integer(loc);} // 0xC0FFEE
if(std::isdigit(*second))
{
return err(format_underline("toml::parse_integer: "
"leading zero in an Integer is not allowed.",
{{source_location(loc), "leading zero"}}));
}
else if(std::isalpha(*second))
{
return err(format_underline("toml::parse_integer: "
"unknown integer prefix appeared.",
{{source_location(loc), "none of 0x, 0o, 0b"}}));
}
}
if(const auto token = lex_dec_int::invoke(loc))
{
auto str = token.unwrap().str();
str.erase(std::remove(str.begin(), str.end(), '_'), str.end());
std::istringstream iss(str);
integer retval(0);
iss >> retval;
return ok(std::make_pair(retval, token.unwrap()));
}
loc.reset(first);
return err(format_underline("toml::parse_integer: ",
{{source_location(loc), "the next token is not an integer"}}));
}
inline result<std::pair<floating, region>, std::string>
parse_floating(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_float::invoke(loc))
{
auto str = token.unwrap().str();
if(str == "inf" || str == "+inf")
{
if(std::numeric_limits<floating>::has_infinity)
{
return ok(std::make_pair(
std::numeric_limits<floating>::infinity(), token.unwrap()));
}
else
{
throw std::domain_error("toml::parse_floating: inf value found"
" but the current environment does not support inf. Please"
" make sure that the floating-point implementation conforms"
" IEEE 754/ISO 60559 international standard.");
}
}
else if(str == "-inf")
{
if(std::numeric_limits<floating>::has_infinity)
{
return ok(std::make_pair(
-std::numeric_limits<floating>::infinity(), token.unwrap()));
}
else
{
throw std::domain_error("toml::parse_floating: inf value found"
" but the current environment does not support inf. Please"
" make sure that the floating-point implementation conforms"
" IEEE 754/ISO 60559 international standard.");
}
}
else if(str == "nan" || str == "+nan")
{
if(std::numeric_limits<floating>::has_quiet_NaN)
{
return ok(std::make_pair(
std::numeric_limits<floating>::quiet_NaN(), token.unwrap()));
}
else if(std::numeric_limits<floating>::has_signaling_NaN)
{
return ok(std::make_pair(
std::numeric_limits<floating>::signaling_NaN(), token.unwrap()));
}
else
{
throw std::domain_error("toml::parse_floating: NaN value found"
" but the current environment does not support NaN. Please"
" make sure that the floating-point implementation conforms"
" IEEE 754/ISO 60559 international standard.");
}
}
else if(str == "-nan")
{
if(std::numeric_limits<floating>::has_quiet_NaN)
{
return ok(std::make_pair(
-std::numeric_limits<floating>::quiet_NaN(), token.unwrap()));
}
else if(std::numeric_limits<floating>::has_signaling_NaN)
{
return ok(std::make_pair(
-std::numeric_limits<floating>::signaling_NaN(), token.unwrap()));
}
else
{
throw std::domain_error("toml::parse_floating: NaN value found"
" but the current environment does not support NaN. Please"
" make sure that the floating-point implementation conforms"
" IEEE 754/ISO 60559 international standard.");
}
}
str.erase(std::remove(str.begin(), str.end(), '_'), str.end());
std::istringstream iss(str);
floating v(0.0);
iss >> v;
return ok(std::make_pair(v, token.unwrap()));
}
loc.reset(first);
return err(format_underline("toml::parse_floating: ",
{{source_location(loc), "the next token is not a float"}}));
}
inline std::string read_utf8_codepoint(const region& reg, const location& loc)
{
const auto str = reg.str().substr(1);
std::uint_least32_t codepoint;
std::istringstream iss(str);
iss >> std::hex >> codepoint;
const auto to_char = [](const std::uint_least32_t i) noexcept -> char {
const auto uc = static_cast<unsigned char>(i);
return *reinterpret_cast<const char*>(std::addressof(uc));
};
std::string character;
if(codepoint < 0x80) // U+0000 ... U+0079 ; just an ASCII.
{
character += static_cast<char>(codepoint);
}
else if(codepoint < 0x800) //U+0080 ... U+07FF
{
// 110yyyyx 10xxxxxx; 0x3f == 0b0011'1111
character += to_char(0xC0| codepoint >> 6);
character += to_char(0x80|(codepoint & 0x3F));
}
else if(codepoint < 0x10000) // U+0800...U+FFFF
{
if(0xD800 <= codepoint && codepoint <= 0xDFFF)
{
throw syntax_error(format_underline(
"toml::read_utf8_codepoint: codepoints in the range "
"[0xD800, 0xDFFF] are not valid UTF-8.", {{
source_location(loc), "not a valid UTF-8 codepoint"
}}), source_location(loc));
}
assert(codepoint < 0xD800 || 0xDFFF < codepoint);
// 1110yyyy 10yxxxxx 10xxxxxx
character += to_char(0xE0| codepoint >> 12);
character += to_char(0x80|(codepoint >> 6 & 0x3F));
character += to_char(0x80|(codepoint & 0x3F));
}
else if(codepoint < 0x110000) // U+010000 ... U+10FFFF
{
// 11110yyy 10yyxxxx 10xxxxxx 10xxxxxx
character += to_char(0xF0| codepoint >> 18);
character += to_char(0x80|(codepoint >> 12 & 0x3F));
character += to_char(0x80|(codepoint >> 6 & 0x3F));
character += to_char(0x80|(codepoint & 0x3F));
}
else // out of UTF-8 region
{
throw syntax_error(format_underline("toml::read_utf8_codepoint:"
" input codepoint is too large.",
{{source_location(loc), "should be in [0x00..0x10FFFF]"}}),
source_location(loc));
}
return character;
}
inline result<std::string, std::string> parse_escape_sequence(location& loc)
{
const auto first = loc.iter();
if(first == loc.end() || *first != '\\')
{
return err(format_underline("toml::parse_escape_sequence: ", {{
source_location(loc), "the next token is not a backslash \"\\\""}}));
}
loc.advance();
switch(*loc.iter())
{
case '\\':{loc.advance(); return ok(std::string("\\"));}
case '"' :{loc.advance(); return ok(std::string("\""));}
case 'b' :{loc.advance(); return ok(std::string("\b"));}
case 't' :{loc.advance(); return ok(std::string("\t"));}
case 'n' :{loc.advance(); return ok(std::string("\n"));}
case 'f' :{loc.advance(); return ok(std::string("\f"));}
case 'r' :{loc.advance(); return ok(std::string("\r"));}
case 'u' :
{
if(const auto token = lex_escape_unicode_short::invoke(loc))
{
return ok(read_utf8_codepoint(token.unwrap(), loc));
}
else
{
return err(format_underline("parse_escape_sequence: "
"invalid token found in UTF-8 codepoint uXXXX.",
{{source_location(loc), "here"}}));
}
}
case 'U':
{
if(const auto token = lex_escape_unicode_long::invoke(loc))
{
return ok(read_utf8_codepoint(token.unwrap(), loc));
}
else
{
return err(format_underline("parse_escape_sequence: "
"invalid token found in UTF-8 codepoint Uxxxxxxxx",
{{source_location(loc), "here"}}));
}
}
}
const auto msg = format_underline("parse_escape_sequence: "
"unknown escape sequence appeared.", {{source_location(loc),
"escape sequence is one of \\, \", b, t, n, f, r, uxxxx, Uxxxxxxxx"}},
/* Hints = */{"if you want to write backslash as just one backslash, "
"use literal string like: regex = '<\\i\\c*\\s*>'"});
loc.reset(first);
return err(msg);
}
inline std::ptrdiff_t check_utf8_validity(const std::string& reg)
{
location loc("tmp", reg);
const auto u8 = repeat<lex_utf8_code, unlimited>::invoke(loc);
if(!u8 || loc.iter() != loc.end())
{
const auto error_location = std::distance(loc.begin(), loc.iter());
assert(0 <= error_location);
return error_location;
}
return -1;
}
inline result<std::pair<toml::string, region>, std::string>
parse_ml_basic_string(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_ml_basic_string::invoke(loc))
{
auto inner_loc = loc;
inner_loc.reset(first);
std::string retval;
retval.reserve(token.unwrap().size());
auto delim = lex_ml_basic_string_open::invoke(inner_loc);
if(!delim)
{
throw internal_error(format_underline(
"parse_ml_basic_string: invalid token",
{{source_location(inner_loc), "should be \"\"\""}}),
source_location(inner_loc));
}
// immediate newline is ignored (if exists)
/* discard return value */ lex_newline::invoke(inner_loc);
delim = none();
while(!delim)
{
using lex_unescaped_seq = repeat<
either<lex_ml_basic_unescaped, lex_newline>, unlimited>;
if(auto unescaped = lex_unescaped_seq::invoke(inner_loc))
{
retval += unescaped.unwrap().str();
}
if(auto escaped = parse_escape_sequence(inner_loc))
{
retval += escaped.unwrap();
}
if(auto esc_nl = lex_ml_basic_escaped_newline::invoke(inner_loc))
{
// ignore newline after escape until next non-ws char
}
if(inner_loc.iter() == inner_loc.end())
{
throw internal_error(format_underline(
"parse_ml_basic_string: unexpected end of region",
{{source_location(inner_loc), "not sufficient token"}}),
source_location(inner_loc));
}
delim = lex_ml_basic_string_close::invoke(inner_loc);
}
// `lex_ml_basic_string_close` allows 3 to 5 `"`s to allow 1 or 2 `"`s
// at just before the delimiter. Here, we need to attach `"`s at the
// end of the string body, if it exists.
// For detail, see the definition of `lex_ml_basic_string_close`.
assert(std::all_of(delim.unwrap().first(), delim.unwrap().last(),
[](const char c) noexcept {return c == '\"';}));
switch(delim.unwrap().size())
{
case 3: {break;}
case 4: {retval += "\""; break;}
case 5: {retval += "\"\""; break;}
default:
{
throw internal_error(format_underline(
"parse_ml_basic_string: closing delimiter has invalid length",
{{source_location(inner_loc), "end of this"}}),
source_location(inner_loc));
}
}
const auto err_loc = check_utf8_validity(token.unwrap().str());
if(err_loc == -1)
{
return ok(std::make_pair(toml::string(retval), token.unwrap()));
}
else
{
inner_loc.reset(first);
inner_loc.advance(err_loc);
throw syntax_error(format_underline(
"parse_ml_basic_string: invalid utf8 sequence found",
{{source_location(inner_loc), "here"}}),
source_location(inner_loc));
}
}
else
{
loc.reset(first);
return err(format_underline("toml::parse_ml_basic_string: "
"the next token is not a valid multiline string",
{{source_location(loc), "here"}}));
}
}
inline result<std::pair<toml::string, region>, std::string>
parse_basic_string(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_basic_string::invoke(loc))
{
auto inner_loc = loc;
inner_loc.reset(first);
auto quot = lex_quotation_mark::invoke(inner_loc);
if(!quot)
{
throw internal_error(format_underline("parse_basic_string: "
"invalid token", {{source_location(inner_loc), "should be \""}}),
source_location(inner_loc));
}
std::string retval;
retval.reserve(token.unwrap().size());
quot = none();
while(!quot)
{
using lex_unescaped_seq = repeat<lex_basic_unescaped, unlimited>;
if(auto unescaped = lex_unescaped_seq::invoke(inner_loc))
{
retval += unescaped.unwrap().str();
}
if(auto escaped = parse_escape_sequence(inner_loc))
{
retval += escaped.unwrap();
}
if(inner_loc.iter() == inner_loc.end())
{
throw internal_error(format_underline(
"parse_basic_string: unexpected end of region",
{{source_location(inner_loc), "not sufficient token"}}),
source_location(inner_loc));
}
quot = lex_quotation_mark::invoke(inner_loc);
}
const auto err_loc = check_utf8_validity(token.unwrap().str());
if(err_loc == -1)
{
return ok(std::make_pair(toml::string(retval), token.unwrap()));
}
else
{
inner_loc.reset(first);
inner_loc.advance(err_loc);
throw syntax_error(format_underline(
"parse_ml_basic_string: invalid utf8 sequence found",
{{source_location(inner_loc), "here"}}),
source_location(inner_loc));
}
}
else
{
loc.reset(first); // rollback
return err(format_underline("toml::parse_basic_string: "
"the next token is not a valid string",
{{source_location(loc), "here"}}));
}
}
inline result<std::pair<toml::string, region>, std::string>
parse_ml_literal_string(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_ml_literal_string::invoke(loc))
{
location inner_loc(loc.name(), token.unwrap().str());
const auto open = lex_ml_literal_string_open::invoke(inner_loc);
if(!open)
{
throw internal_error(format_underline(
"parse_ml_literal_string: invalid token",
{{source_location(inner_loc), "should be '''"}}),
source_location(inner_loc));
}
// immediate newline is ignored (if exists)
/* discard return value */ lex_newline::invoke(inner_loc);
const auto body = lex_ml_literal_body::invoke(inner_loc);
const auto close = lex_ml_literal_string_close::invoke(inner_loc);
if(!close)
{
throw internal_error(format_underline(
"parse_ml_literal_string: invalid token",
{{source_location(inner_loc), "should be '''"}}),
source_location(inner_loc));
}
// `lex_ml_literal_string_close` allows 3 to 5 `'`s to allow 1 or 2 `'`s
// at just before the delimiter. Here, we need to attach `'`s at the
// end of the string body, if it exists.
// For detail, see the definition of `lex_ml_basic_string_close`.
std::string retval = body.unwrap().str();
assert(std::all_of(close.unwrap().first(), close.unwrap().last(),
[](const char c) noexcept {return c == '\'';}));
switch(close.unwrap().size())
{
case 3: {break;}
case 4: {retval += "'"; break;}
case 5: {retval += "''"; break;}
default:
{
throw internal_error(format_underline(
"parse_ml_literal_string: closing delimiter has invalid length",
{{source_location(inner_loc), "end of this"}}),
source_location(inner_loc));
}
}
const auto err_loc = check_utf8_validity(token.unwrap().str());
if(err_loc == -1)
{
return ok(std::make_pair(toml::string(retval, toml::string_t::literal),
token.unwrap()));
}
else
{
inner_loc.reset(first);
inner_loc.advance(err_loc);
throw syntax_error(format_underline(
"parse_ml_basic_string: invalid utf8 sequence found",
{{source_location(inner_loc), "here"}}),
source_location(inner_loc));
}
}
else
{
loc.reset(first); // rollback
return err(format_underline("toml::parse_ml_literal_string: "
"the next token is not a valid multiline literal string",
{{source_location(loc), "here"}}));
}
}
inline result<std::pair<toml::string, region>, std::string>
parse_literal_string(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_literal_string::invoke(loc))
{
location inner_loc(loc.name(), token.unwrap().str());
const auto open = lex_apostrophe::invoke(inner_loc);
if(!open)
{
throw internal_error(format_underline(
"parse_literal_string: invalid token",
{{source_location(inner_loc), "should be '"}}),
source_location(inner_loc));
}
const auto body = repeat<lex_literal_char, unlimited>::invoke(inner_loc);
const auto close = lex_apostrophe::invoke(inner_loc);
if(!close)
{
throw internal_error(format_underline(
"parse_literal_string: invalid token",
{{source_location(inner_loc), "should be '"}}),
source_location(inner_loc));
}
const auto err_loc = check_utf8_validity(token.unwrap().str());
if(err_loc == -1)
{
return ok(std::make_pair(
toml::string(body.unwrap().str(), toml::string_t::literal),
token.unwrap()));
}
else
{
inner_loc.reset(first);
inner_loc.advance(err_loc);
throw syntax_error(format_underline(
"parse_ml_basic_string: invalid utf8 sequence found",
{{source_location(inner_loc), "here"}}),
source_location(inner_loc));
}
}
else
{
loc.reset(first); // rollback
return err(format_underline("toml::parse_literal_string: "
"the next token is not a valid literal string",
{{source_location(loc), "here"}}));
}
}
inline result<std::pair<toml::string, region>, std::string>
parse_string(location& loc)
{
if(loc.iter() != loc.end() && *(loc.iter()) == '"')
{
if(loc.iter() + 1 != loc.end() && *(loc.iter() + 1) == '"' &&
loc.iter() + 2 != loc.end() && *(loc.iter() + 2) == '"')
{
return parse_ml_basic_string(loc);
}
else
{
return parse_basic_string(loc);
}
}
else if(loc.iter() != loc.end() && *(loc.iter()) == '\'')
{
if(loc.iter() + 1 != loc.end() && *(loc.iter() + 1) == '\'' &&
loc.iter() + 2 != loc.end() && *(loc.iter() + 2) == '\'')
{
return parse_ml_literal_string(loc);
}
else
{
return parse_literal_string(loc);
}
}
return err(format_underline("toml::parse_string: ",
{{source_location(loc), "the next token is not a string"}}));
}
inline result<std::pair<local_date, region>, std::string>
parse_local_date(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_local_date::invoke(loc))
{
location inner_loc(loc.name(), token.unwrap().str());
const auto y = lex_date_fullyear::invoke(inner_loc);
if(!y || inner_loc.iter() == inner_loc.end() || *inner_loc.iter() != '-')
{
throw internal_error(format_underline(
"toml::parse_inner_local_date: invalid year format",
{{source_location(inner_loc), "should be `-`"}}),
source_location(inner_loc));
}
inner_loc.advance();
const auto m = lex_date_month::invoke(inner_loc);
if(!m || inner_loc.iter() == inner_loc.end() || *inner_loc.iter() != '-')
{
throw internal_error(format_underline(
"toml::parse_local_date: invalid month format",
{{source_location(inner_loc), "should be `-`"}}),
source_location(inner_loc));
}
inner_loc.advance();
const auto d = lex_date_mday::invoke(inner_loc);
if(!d)
{
throw internal_error(format_underline(
"toml::parse_local_date: invalid day format",
{{source_location(inner_loc), "here"}}),
source_location(inner_loc));
}
const auto year = static_cast<std::int16_t>(from_string<int>(y.unwrap().str(), 0));
const auto month = static_cast<std::int8_t >(from_string<int>(m.unwrap().str(), 0));
const auto day = static_cast<std::int8_t >(from_string<int>(d.unwrap().str(), 0));
// We briefly check whether the input date is valid or not. But here, we
// only check if the RFC3339 compliance.
// Actually there are several special date that does not exist,
// because of historical reasons, such as 1582/10/5-1582/10/14 (only in
// several countries). But here, we do not care about such a complicated
// rule. It makes the code complicated and there is only low probability
// that such a specific date is needed in practice. If someone need to
// validate date accurately, that means that the one need a specialized
// library for their purpose in a different layer.
{
const bool is_leap = (year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0));
const auto max_day = (month == 2) ? (is_leap ? 29 : 28) :
((month == 4 || month == 6 || month == 9 || month == 11) ? 30 : 31);
if((month < 1 || 12 < month) || (day < 1 || max_day < day))
{
throw syntax_error(format_underline("toml::parse_date: "
"invalid date: it does not conform RFC3339.", {{
source_location(loc), "month should be 01-12, day should be"
" 01-28,29,30,31, depending on month/year."
}}), source_location(inner_loc));
}
}
return ok(std::make_pair(local_date(year, static_cast<month_t>(month - 1), day),
token.unwrap()));
}
else
{
loc.reset(first);
return err(format_underline("toml::parse_local_date: ",
{{source_location(loc), "the next token is not a local_date"}}));
}
}
inline result<std::pair<local_time, region>, std::string>
parse_local_time(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_local_time::invoke(loc))
{
location inner_loc(loc.name(), token.unwrap().str());
const auto h = lex_time_hour::invoke(inner_loc);
if(!h || inner_loc.iter() == inner_loc.end() || *inner_loc.iter() != ':')
{
throw internal_error(format_underline(
"toml::parse_local_time: invalid year format",
{{source_location(inner_loc), "should be `:`"}}),
source_location(inner_loc));
}
inner_loc.advance();
const auto m = lex_time_minute::invoke(inner_loc);
if(!m || inner_loc.iter() == inner_loc.end() || *inner_loc.iter() != ':')
{
throw internal_error(format_underline(
"toml::parse_local_time: invalid month format",
{{source_location(inner_loc), "should be `:`"}}),
source_location(inner_loc));
}
inner_loc.advance();
const auto s = lex_time_second::invoke(inner_loc);
if(!s)
{
throw internal_error(format_underline(
"toml::parse_local_time: invalid second format",
{{source_location(inner_loc), "here"}}),
source_location(inner_loc));
}
const int hour = from_string<int>(h.unwrap().str(), 0);
const int minute = from_string<int>(m.unwrap().str(), 0);
const int second = from_string<int>(s.unwrap().str(), 0);
if((hour < 0 || 23 < hour) || (minute < 0 || 59 < minute) ||
(second < 0 || 60 < second)) // it may be leap second
{
throw syntax_error(format_underline("toml::parse_time: "
"invalid time: it does not conform RFC3339.", {{
source_location(loc), "hour should be 00-23, minute should be"
" 00-59, second should be 00-60 (depending on the leap"
" second rules.)"}}), source_location(inner_loc));
}
local_time time(hour, minute, second, 0, 0);
const auto before_secfrac = inner_loc.iter();
if(const auto secfrac = lex_time_secfrac::invoke(inner_loc))
{
auto sf = secfrac.unwrap().str();
sf.erase(sf.begin()); // sf.front() == '.'
switch(sf.size() % 3)
{
case 2: sf += '0'; break;
case 1: sf += "00"; break;
case 0: break;
default: break;
}
if(sf.size() >= 9)
{
time.millisecond = from_string<std::uint16_t>(sf.substr(0, 3), 0u);
time.microsecond = from_string<std::uint16_t>(sf.substr(3, 3), 0u);
time.nanosecond = from_string<std::uint16_t>(sf.substr(6, 3), 0u);
}
else if(sf.size() >= 6)
{
time.millisecond = from_string<std::uint16_t>(sf.substr(0, 3), 0u);
time.microsecond = from_string<std::uint16_t>(sf.substr(3, 3), 0u);
}
else if(sf.size() >= 3)
{
time.millisecond = from_string<std::uint16_t>(sf, 0u);
time.microsecond = 0u;
}
}
else
{
if(before_secfrac != inner_loc.iter())
{
throw internal_error(format_underline(
"toml::parse_local_time: invalid subsecond format",
{{source_location(inner_loc), "here"}}),
source_location(inner_loc));
}
}
return ok(std::make_pair(time, token.unwrap()));
}
else
{
loc.reset(first);
return err(format_underline("toml::parse_local_time: ",
{{source_location(loc), "the next token is not a local_time"}}));
}
}
inline result<std::pair<local_datetime, region>, std::string>
parse_local_datetime(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_local_date_time::invoke(loc))
{
location inner_loc(loc.name(), token.unwrap().str());
const auto date = parse_local_date(inner_loc);
if(!date || inner_loc.iter() == inner_loc.end())
{
throw internal_error(format_underline(
"toml::parse_local_datetime: invalid datetime format",
{{source_location(inner_loc), "date, not datetime"}}),
source_location(inner_loc));
}
const char delim = *(inner_loc.iter());
if(delim != 'T' && delim != 't' && delim != ' ')
{
throw internal_error(format_underline(
"toml::parse_local_datetime: invalid datetime format",
{{source_location(inner_loc), "should be `T` or ` ` (space)"}}),
source_location(inner_loc));
}
inner_loc.advance();
const auto time = parse_local_time(inner_loc);
if(!time)
{
throw internal_error(format_underline(
"toml::parse_local_datetime: invalid datetime format",
{{source_location(inner_loc), "invalid time format"}}),
source_location(inner_loc));
}
return ok(std::make_pair(
local_datetime(date.unwrap().first, time.unwrap().first),
token.unwrap()));
}
else
{
loc.reset(first);
return err(format_underline("toml::parse_local_datetime: ",
{{source_location(loc), "the next token is not a local_datetime"}}));
}
}
inline result<std::pair<offset_datetime, region>, std::string>
parse_offset_datetime(location& loc)
{
const auto first = loc.iter();
if(const auto token = lex_offset_date_time::invoke(loc))
{
location inner_loc(loc.name(), token.unwrap().str());
const auto datetime = parse_local_datetime(inner_loc);
if(!datetime || inner_loc.iter() == inner_loc.end())
{
throw internal_error(format_underline(
"toml::parse_offset_datetime: invalid datetime format",
{{source_location(inner_loc), "date, not datetime"}}),
source_location(inner_loc));
}
time_offset offset(0, 0);
if(const auto ofs = lex_time_numoffset::invoke(inner_loc))
{
const auto str = ofs.unwrap().str();
const auto hour = from_string<int>(str.substr(1,2), 0);
const auto minute = from_string<int>(str.substr(4,2), 0);
if((hour < 0 || 23 < hour) || (minute < 0 || 59 < minute))
{
throw syntax_error(format_underline("toml::parse_offset_datetime: "
"invalid offset: it does not conform RFC3339.", {{
source_location(loc), "month should be 01-12, day should be"
" 01-28,29,30,31, depending on month/year."
}}), source_location(inner_loc));
}
if(str.front() == '+')
{
offset = time_offset(hour, minute);
}
else
{
offset = time_offset(-hour, -minute);
}
}
else if(*inner_loc.iter() != 'Z' && *inner_loc.iter() != 'z')
{
throw internal_error(format_underline(
"toml::parse_offset_datetime: invalid datetime format",
{{source_location(inner_loc), "should be `Z` or `+HH:MM`"}}),
source_location(inner_loc));
}
return ok(std::make_pair(offset_datetime(datetime.unwrap().first, offset),
token.unwrap()));
}
else
{
loc.reset(first);
return err(format_underline("toml::parse_offset_datetime: ",
{{source_location(loc), "the next token is not a offset_datetime"}}));
}
}
inline result<std::pair<key, region>, std::string>
parse_simple_key(location& loc)
{
if(const auto bstr = parse_basic_string(loc))
{
return ok(std::make_pair(bstr.unwrap().first.str, bstr.unwrap().second));
}
if(const auto lstr = parse_literal_string(loc))
{
return ok(std::make_pair(lstr.unwrap().first.str, lstr.unwrap().second));
}
if(const auto bare = lex_unquoted_key::invoke(loc))
{
const auto reg = bare.unwrap();
return ok(std::make_pair(reg.str(), reg));
}
return err(format_underline("toml::parse_simple_key: ",
{{source_location(loc), "the next token is not a simple key"}}));
}
// dotted key become vector of keys
inline result<std::pair<std::vector<key>, region>, std::string>
parse_key(location& loc)
{
const auto first = loc.iter();
// dotted key -> `foo.bar.baz` where several single keys are chained by
// dots. Whitespaces between keys and dots are allowed.
if(const auto token = lex_dotted_key::invoke(loc))
{
const auto reg = token.unwrap();
location inner_loc(loc.name(), reg.str());
std::vector<key> keys;
while(inner_loc.iter() != inner_loc.end())
{
lex_ws::invoke(inner_loc);
if(const auto k = parse_simple_key(inner_loc))
{
keys.push_back(k.unwrap().first);
}
else
{
throw internal_error(format_underline(
"toml::detail::parse_key: dotted key contains invalid key",
{{source_location(inner_loc), k.unwrap_err()}}),
source_location(inner_loc));
}
lex_ws::invoke(inner_loc);
if(inner_loc.iter() == inner_loc.end())
{
break;
}
else if(*inner_loc.iter() == '.')
{
inner_loc.advance(); // to skip `.`
}
else
{
throw internal_error(format_underline("toml::parse_key: "
"dotted key contains invalid key ",
{{source_location(inner_loc), "should be `.`"}}),
source_location(inner_loc));
}
}
return ok(std::make_pair(keys, reg));
}
loc.reset(first);
// simple_key: a single (basic_string|literal_string|bare key)
if(const auto smpl = parse_simple_key(loc))
{
return ok(std::make_pair(std::vector<key>(1, smpl.unwrap().first),
smpl.unwrap().second));
}
return err(format_underline("toml::parse_key: an invalid key appeared.",
{{source_location(loc), "is not a valid key"}}, {
"bare keys : non-empty strings composed only of [A-Za-z0-9_-].",
"quoted keys: same as \"basic strings\" or 'literal strings'.",
"dotted keys: sequence of bare or quoted keys joined with a dot."
}));
}
// forward-decl to implement parse_array and parse_table
template<typename Value>
result<Value, std::string> parse_value(location&);
template<typename Value>
result<std::pair<typename Value::array_type, region>, std::string>
parse_array(location& loc)
{
using value_type = Value;
using array_type = typename value_type::array_type;
const auto first = loc.iter();
if(loc.iter() == loc.end())
{
return err("toml::parse_array: input is empty");
}
if(*loc.iter() != '[')
{
return err("toml::parse_array: token is not an array");
}
loc.advance();
using lex_ws_comment_newline = repeat<
either<lex_wschar, lex_newline, lex_comment>, unlimited>;
array_type retval;
while(loc.iter() != loc.end())
{
lex_ws_comment_newline::invoke(loc); // skip
if(loc.iter() != loc.end() && *loc.iter() == ']')
{
loc.advance(); // skip ']'
return ok(std::make_pair(retval,
region(loc, first, loc.iter())));
}
if(auto val = parse_value<value_type>(loc))
{
// After TOML v1.0.0-rc.1, array becomes to be able to have values
// with different types. So here we will omit this by default.
//
// But some of the test-suite checks if the parser accepts a hetero-
// geneous arrays, so we keep this for a while.
#ifdef TOML11_DISALLOW_HETEROGENEOUS_ARRAYS
if(!retval.empty() && retval.front().type() != val.as_ok().type())
{
auto array_start_loc = loc;
array_start_loc.reset(first);
throw syntax_error(format_underline("toml::parse_array: "
"type of elements should be the same each other.", {
{source_location(array_start_loc), "array starts here"},
{
retval.front().location(),
"value has type " + stringize(retval.front().type())
},
{
val.unwrap().location(),
"value has different type, " + stringize(val.unwrap().type())
}
}), source_location(loc));
}
#endif
retval.push_back(std::move(val.unwrap()));
}
else
{
auto array_start_loc = loc;
array_start_loc.reset(first);
throw syntax_error(format_underline("toml::parse_array: "
"value having invalid format appeared in an array", {
{source_location(array_start_loc), "array starts here"},
{source_location(loc), "it is not a valid value."}
}), source_location(loc));
}
using lex_array_separator = sequence<maybe<lex_ws_comment_newline>, character<','>>;
const auto sp = lex_array_separator::invoke(loc);
if(!sp)
{
lex_ws_comment_newline::invoke(loc);
if(loc.iter() != loc.end() && *loc.iter() == ']')
{
loc.advance(); // skip ']'
return ok(std::make_pair(retval,
region(loc, first, loc.iter())));
}
else
{
auto array_start_loc = loc;
array_start_loc.reset(first);
throw syntax_error(format_underline("toml::parse_array:"
" missing array separator `,` after a value", {
{source_location(array_start_loc), "array starts here"},
{source_location(loc), "should be `,`"}
}), source_location(loc));
}
}
}
loc.reset(first);
throw syntax_error(format_underline("toml::parse_array: "
"array did not closed by `]`",
{{source_location(loc), "should be closed"}}),
source_location(loc));
}
template<typename Value>
result<std::pair<std::pair<std::vector<key>, region>, Value>, std::string>
parse_key_value_pair(location& loc)
{
using value_type = Value;
const auto first = loc.iter();
auto key_reg = parse_key(loc);
if(!key_reg)
{
std::string msg = std::move(key_reg.unwrap_err());
// if the next token is keyvalue-separator, it means that there are no
// key. then we need to show error as "empty key is not allowed".
if(const auto keyval_sep = lex_keyval_sep::invoke(loc))
{
loc.reset(first);
msg = format_underline("toml::parse_key_value_pair: "
"empty key is not allowed.",
{{source_location(loc), "key expected before '='"}});
}
return err(std::move(msg));
}
const auto kvsp = lex_keyval_sep::invoke(loc);
if(!kvsp)
{
std::string msg;
// if the line contains '=' after the invalid sequence, possibly the
// error is in the key (like, invalid character in bare key).
const auto line_end = std::find(loc.iter(), loc.end(), '\n');
if(std::find(loc.iter(), line_end, '=') != line_end)
{
msg = format_underline("toml::parse_key_value_pair: "
"invalid format for key",
{{source_location(loc), "invalid character in key"}},
{"Did you forget '.' to separate dotted-key?",
"Allowed characters for bare key are [0-9a-zA-Z_-]."});
}
else // if not, the error is lack of key-value separator.
{
msg = format_underline("toml::parse_key_value_pair: "
"missing key-value separator `=`",
{{source_location(loc), "should be `=`"}});
}
loc.reset(first);
return err(std::move(msg));
}
const auto after_kvsp = loc.iter(); // err msg
auto val = parse_value<value_type>(loc);
if(!val)
{
std::string msg;
loc.reset(after_kvsp);
// check there is something not a comment/whitespace after `=`
if(sequence<maybe<lex_ws>, maybe<lex_comment>, lex_newline>::invoke(loc))
{
loc.reset(after_kvsp);
msg = format_underline("toml::parse_key_value_pair: "
"missing value after key-value separator '='",
{{source_location(loc), "expected value, but got nothing"}});
}
else // there is something not a comment/whitespace, so invalid format.
{
msg = std::move(val.unwrap_err());
}
loc.reset(first);
return err(msg);
}
return ok(std::make_pair(std::move(key_reg.unwrap()),
std::move(val.unwrap())));
}
// for error messages.
template<typename InputIterator>
std::string format_dotted_keys(InputIterator first, const InputIterator last)
{
static_assert(std::is_same<key,
typename std::iterator_traits<InputIterator>::value_type>::value,"");
std::string retval(*first++);
for(; first != last; ++first)
{
retval += '.';
retval += *first;
}
return retval;
}
// forward decl for is_valid_forward_table_definition
result<std::pair<std::vector<key>, region>, std::string>
parse_table_key(location& loc);
template<typename Value>
result<std::pair<typename Value::table_type, region>, std::string>
parse_inline_table(location& loc);
// The following toml file is allowed.
// ```toml
// [a.b.c] # here, table `a` has element `b`.
// foo = "bar"
// [a] # merge a = {baz = "qux"} to a = {b = {...}}
// baz = "qux"
// ```
// But the following is not allowed.
// ```toml
// [a]
// b.c.foo = "bar"
// [a] # error! the same table [a] defined!
// baz = "qux"
// ```
// The following is neither allowed.
// ```toml
// a = { b.c.foo = "bar"}
// [a] # error! the same table [a] defined!
// baz = "qux"
// ```
// Here, it parses region of `tab->at(k)` as a table key and check the depth
// of the key. If the key region points deeper node, it would be allowed.
// Otherwise, the key points the same node. It would be rejected.
template<typename Value, typename Iterator>
bool is_valid_forward_table_definition(const Value& fwd, const Value& inserting,
Iterator key_first, Iterator key_curr, Iterator key_last)
{
// ------------------------------------------------------------------------
// check type of the value to be inserted/merged
std::string inserting_reg = "";
if(const auto ptr = detail::get_region(inserting))
{
inserting_reg = ptr->str();
}
location inserting_def("internal", std::move(inserting_reg));
if(const auto inlinetable = parse_inline_table<Value>(inserting_def))
{
// check if we are overwriting existing table.
// ```toml
// # NG
// a.b = 42
// a = {d = 3.14}
// ```
// Inserting an inline table to a existing super-table is not allowed in
// any case. If we found it, we can reject it without further checking.
return false;
}
// ------------------------------------------------------------------------
// check table defined before
std::string internal = "";
if(const auto ptr = detail::get_region(fwd))
{
internal = ptr->str();
}
location def("internal", std::move(internal));
if(const auto tabkeys = parse_table_key(def)) // [table.key]
{
// table keys always contains all the nodes from the root.
const auto& tks = tabkeys.unwrap().first;
if(std::size_t(std::distance(key_first, key_last)) == tks.size() &&
std::equal(tks.begin(), tks.end(), key_first))
{
// the keys are equivalent. it is not allowed.
return false;
}
// the keys are not equivalent. it is allowed.
return true;
}
if(const auto dotkeys = parse_key(def))
{
// consider the following case.
// [a]
// b.c = {d = 42}
// [a.b.c]
// e = 2.71
// this defines the table [a.b.c] twice. no?
// a dotted key starts from the node representing a table in which the
// dotted key belongs to.
const auto& dks = dotkeys.unwrap().first;
if(std::size_t(std::distance(key_curr, key_last)) == dks.size() &&
std::equal(dks.begin(), dks.end(), key_curr))
{
// the keys are equivalent. it is not allowed.
return false;
}
// the keys are not equivalent. it is allowed.
return true;
}
return false;
}
template<typename Value, typename InputIterator>
result<bool, std::string>
insert_nested_key(typename Value::table_type& root, const Value& v,
InputIterator iter, const InputIterator last,
region key_reg,
const bool is_array_of_table = false)
{
static_assert(std::is_same<key,
typename std::iterator_traits<InputIterator>::value_type>::value,"");
using value_type = Value;
using table_type = typename value_type::table_type;
using array_type = typename value_type::array_type;
const auto first = iter;
assert(iter != last);
table_type* tab = std::addressof(root);
for(; iter != last; ++iter) // search recursively
{
const key& k = *iter;
if(std::next(iter) == last) // k is the last key
{
// XXX if the value is array-of-tables, there can be several
// tables that are in the same array. in that case, we need to
// find the last element and insert it to there.
if(is_array_of_table)
{
if(tab->count(k) == 1) // there is already an array of table
{
if(tab->at(k).is_table())
{
// show special err msg for conflicting table
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: array of table (\"",
format_dotted_keys(first, last),
"\") cannot be defined"), {
{tab->at(k).location(), "table already defined"},
{v.location(), "this conflicts with the previous table"}
}), v.location());
}
else if(!(tab->at(k).is_array()))
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: array of table (\"",
format_dotted_keys(first, last), "\") collides with"
" existing value"), {
{tab->at(k).location(),
concat_to_string("this ", tab->at(k).type(),
" value already exists")},
{v.location(),
"while inserting this array-of-tables"}
}), v.location());
}
// the above if-else-if checks tab->at(k) is an array
auto& a = tab->at(k).as_array();
// If table element is defined as [[array_of_tables]], it
// cannot be an empty array. If an array of tables is
// defined as `aot = []`, it cannot be appended.
if(a.empty() || !(a.front().is_table()))
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: array of table (\"",
format_dotted_keys(first, last), "\") collides with"
" existing value"), {
{tab->at(k).location(),
concat_to_string("this ", tab->at(k).type(),
" value already exists")},
{v.location(),
"while inserting this array-of-tables"}
}), v.location());
}
// avoid conflicting array of table like the following.
// ```toml
// a = [{b = 42}] # define a as an array of *inline* tables
// [[a]] # a is an array of *multi-line* tables
// b = 54
// ```
// Here, from the type information, these cannot be detected
// because inline table is also a table.
// But toml v0.5.0 explicitly says it is invalid. The above
// array-of-tables has a static size and appending to the
// array is invalid.
// In this library, multi-line table value has a region
// that points to the key of the table (e.g. [[a]]). By
// comparing the first two letters in key, we can detect
// the array-of-table is inline or multiline.
if(const auto ptr = detail::get_region(a.front()))
{
if(ptr->str().substr(0,2) != "[[")
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: array of table (\"",
format_dotted_keys(first, last), "\") collides "
"with existing array-of-tables"), {
{tab->at(k).location(),
concat_to_string("this ", tab->at(k).type(),
" value has static size")},
{v.location(),
"appending it to the statically sized array"}
}), v.location());
}
}
a.push_back(v);
return ok(true);
}
else // if not, we need to create the array of table
{
// XXX: Consider the following array of tables.
// ```toml
// # This is a comment.
// [[aot]]
// foo = "bar"
// ```
// Here, the comment is for `aot`. But here, actually two
// values are defined. An array that contains tables, named
// `aot`, and the 0th element of the `aot`, `{foo = "bar"}`.
// Those two are different from each other. But both of them
// points to the same portion of the TOML file, `[[aot]]`,
// so `key_reg.comments()` returns `# This is a comment`.
// If it is assigned as a comment of `aot` defined here, the
// comment will be duplicated. Both the `aot` itself and
// the 0-th element will have the same comment. This causes
// "duplication of the same comments" bug when the data is
// serialized.
// Next, consider the following.
// ```toml
// # comment 1
// aot = [
// # comment 2
// {foo = "bar"},
// ]
// ```
// In this case, we can distinguish those two comments. So
// here we need to add "comment 1" to the `aot` and
// "comment 2" to the 0th element of that.
// To distinguish those two, we check the key region.
std::vector<std::string> comments{/* empty by default */};
if(key_reg.str().substr(0, 2) != "[[")
{
comments = key_reg.comments();
}
value_type aot(array_type(1, v), key_reg, std::move(comments));
tab->insert(std::make_pair(k, aot));
return ok(true);
}
} // end if(array of table)
if(tab->count(k) == 1)
{
if(tab->at(k).is_table() && v.is_table())
{
if(!is_valid_forward_table_definition(
tab->at(k), v, first, iter, last))
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: table (\"",
format_dotted_keys(first, last),
"\") already exists."), {
{tab->at(k).location(), "table already exists here"},
{v.location(), "table defined twice"}
}), v.location());
}
// to allow the following toml file.
// [a.b.c]
// d = 42
// [a]
// e = 2.71
auto& t = tab->at(k).as_table();
for(const auto& kv : v.as_table())
{
if(tab->at(k).contains(kv.first))
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: value (\"",
format_dotted_keys(first, last),
"\") already exists."), {
{t.at(kv.first).location(), "already exists here"},
{v.location(), "this defined twice"}
}), v.location());
}
t[kv.first] = kv.second;
}
detail::change_region(tab->at(k), key_reg);
return ok(true);
}
else if(v.is_table() &&
tab->at(k).is_array() &&
tab->at(k).as_array().size() > 0 &&
tab->at(k).as_array().front().is_table())
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: array of tables (\"",
format_dotted_keys(first, last), "\") already exists."), {
{tab->at(k).location(), "array of tables defined here"},
{v.location(), "table conflicts with the previous array of table"}
}), v.location());
}
else
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: value (\"",
format_dotted_keys(first, last), "\") already exists."), {
{tab->at(k).location(), "value already exists here"},
{v.location(), "value defined twice"}
}), v.location());
}
}
tab->insert(std::make_pair(k, v));
return ok(true);
}
else // k is not the last one, we should insert recursively
{
// if there is no corresponding value, insert it first.
// related: you don't need to write
// # [x]
// # [x.y]
// to write
// [x.y.z]
if(tab->count(k) == 0)
{
// a table that is defined implicitly doesn't have any comments.
(*tab)[k] = value_type(table_type{}, key_reg, {/*no comment*/});
}
// type checking...
if(tab->at(k).is_table())
{
// According to toml-lang/toml:36d3091b3 "Clarify that inline
// tables are immutable", check if it adds key-value pair to an
// inline table.
if(const auto* ptr = get_region(tab->at(k)))
{
// here, if the value is a (multi-line) table, the region
// should be something like `[table-name]`.
if(ptr->front() == '{')
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: inserting to an inline table (",
format_dotted_keys(first, std::next(iter)),
") but inline tables are immutable"), {
{tab->at(k).location(), "inline tables are immutable"},
{v.location(), "inserting this"}
}), v.location());
}
}
tab = std::addressof((*tab)[k].as_table());
}
else if(tab->at(k).is_array()) // inserting to array-of-tables?
{
auto& a = (*tab)[k].as_array();
if(!a.back().is_table())
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: target (",
format_dotted_keys(first, std::next(iter)),
") is neither table nor an array of tables"), {
{a.back().location(), concat_to_string(
"actual type is ", a.back().type())},
{v.location(), "inserting this"}
}), v.location());
}
tab = std::addressof(a.back().as_table());
}
else
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: target (",
format_dotted_keys(first, std::next(iter)),
") is neither table nor an array of tables"), {
{tab->at(k).location(), concat_to_string(
"actual type is ", tab->at(k).type())},
{v.location(), "inserting this"}
}), v.location());
}
}
}
return err(std::string("toml::detail::insert_nested_key: never reach here"));
}
template<typename Value>
result<std::pair<typename Value::table_type, region>, std::string>
parse_inline_table(location& loc)
{
using value_type = Value;
using table_type = typename value_type::table_type;
const auto first = loc.iter();
table_type retval;
if(!(loc.iter() != loc.end() && *loc.iter() == '{'))
{
return err(format_underline("toml::parse_inline_table: ",
{{source_location(loc), "the next token is not an inline table"}}));
}
loc.advance();
// check if the inline table is an empty table = { }
maybe<lex_ws>::invoke(loc);
if(loc.iter() != loc.end() && *loc.iter() == '}')
{
loc.advance(); // skip `}`
return ok(std::make_pair(retval, region(loc, first, loc.iter())));
}
// it starts from "{". it should be formatted as inline-table
while(loc.iter() != loc.end())
{
const auto kv_r = parse_key_value_pair<value_type>(loc);
if(!kv_r)
{
return err(kv_r.unwrap_err());
}
const auto& kvpair = kv_r.unwrap();
const std::vector<key>& keys = kvpair.first.first;
const auto& key_reg = kvpair.first.second;
const value_type& val = kvpair.second;
const auto inserted =
insert_nested_key(retval, val, keys.begin(), keys.end(), key_reg);
if(!inserted)
{
throw internal_error("toml::parse_inline_table: "
"failed to insert value into table: " + inserted.unwrap_err(),
source_location(loc));
}
using lex_table_separator = sequence<maybe<lex_ws>, character<','>>;
const auto sp = lex_table_separator::invoke(loc);
if(!sp)
{
maybe<lex_ws>::invoke(loc);
if(loc.iter() == loc.end())
{
throw syntax_error(format_underline(
"toml::parse_inline_table: missing table separator `}` ",
{{source_location(loc), "should be `}`"}}),
source_location(loc));
}
else if(*loc.iter() == '}')
{
loc.advance(); // skip `}`
return ok(std::make_pair(
retval, region(loc, first, loc.iter())));
}
else if(*loc.iter() == '#' || *loc.iter() == '\r' || *loc.iter() == '\n')
{
throw syntax_error(format_underline(
"toml::parse_inline_table: missing curly brace `}`",
{{source_location(loc), "should be `}`"}}),
source_location(loc));
}
else
{
throw syntax_error(format_underline(
"toml::parse_inline_table: missing table separator `,` ",
{{source_location(loc), "should be `,`"}}),
source_location(loc));
}
}
else // `,` is found
{
maybe<lex_ws>::invoke(loc);
if(loc.iter() != loc.end() && *loc.iter() == '}')
{
throw syntax_error(format_underline(
"toml::parse_inline_table: trailing comma is not allowed in"
" an inline table",
{{source_location(loc), "should be `}`"}}),
source_location(loc));
}
}
}
loc.reset(first);
throw syntax_error(format_underline("toml::parse_inline_table: "
"inline table did not closed by `}`",
{{source_location(loc), "should be closed"}}),
source_location(loc));
}
inline result<value_t, std::string> guess_number_type(const location& l)
{
// This function tries to find some (common) mistakes by checking characters
// that follows the last character of a value. But it is often difficult
// because some non-newline characters can appear after a value. E.g.
// spaces, tabs, commas (in an array or inline table), closing brackets
// (of an array or inline table), comment-sign (#). Since this function
// does not parse further, those characters are always allowed to be there.
location loc = l;
if(lex_offset_date_time::invoke(loc)) {return ok(value_t::offset_datetime);}
loc.reset(l.iter());
if(lex_local_date_time::invoke(loc))
{
// bad offset may appear after this.
if(loc.iter() != loc.end() && (*loc.iter() == '+' || *loc.iter() == '-'
|| *loc.iter() == 'Z' || *loc.iter() == 'z'))
{
return err(format_underline("bad offset: should be [+-]HH:MM or Z",
{{source_location(loc), "[+-]HH:MM or Z"}},
{"pass: +09:00, -05:30", "fail: +9:00, -5:30"}));
}
return ok(value_t::local_datetime);
}
loc.reset(l.iter());
if(lex_local_date::invoke(loc))
{
// bad time may appear after this.
// A space is allowed as a delimiter between local time. But there are
// both cases in which a space becomes valid or invalid.
// - invalid: 2019-06-16 7:00:00
// - valid : 2019-06-16 07:00:00
if(loc.iter() != loc.end())
{
const auto c = *loc.iter();
if(c == 'T' || c == 't')
{
return err(format_underline("bad time: should be HH:MM:SS.subsec",
{{source_location(loc), "HH:MM:SS.subsec"}},
{"pass: 1979-05-27T07:32:00, 1979-05-27 07:32:00.999999",
"fail: 1979-05-27T7:32:00, 1979-05-27 17:32"}));
}
if('0' <= c && c <= '9')
{
return err(format_underline("bad time: missing T",
{{source_location(loc), "T or space required here"}},
{"pass: 1979-05-27T07:32:00, 1979-05-27 07:32:00.999999",
"fail: 1979-05-27T7:32:00, 1979-05-27 7:32"}));
}
if(c == ' ' && std::next(loc.iter()) != loc.end() &&
('0' <= *std::next(loc.iter()) && *std::next(loc.iter())<= '9'))
{
loc.advance();
return err(format_underline("bad time: should be HH:MM:SS.subsec",
{{source_location(loc), "HH:MM:SS.subsec"}},
{"pass: 1979-05-27T07:32:00, 1979-05-27 07:32:00.999999",
"fail: 1979-05-27T7:32:00, 1979-05-27 7:32"}));
}
}
return ok(value_t::local_date);
}
loc.reset(l.iter());
if(lex_local_time::invoke(loc)) {return ok(value_t::local_time);}
loc.reset(l.iter());
if(lex_float::invoke(loc))
{
if(loc.iter() != loc.end() && *loc.iter() == '_')
{
return err(format_underline("bad float: `_` should be surrounded by digits",
{{source_location(loc), "here"}},
{"pass: +1.0, -2e-2, 3.141_592_653_589, inf, nan",
"fail: .0, 1., _1.0, 1.0_, 1_.0, 1.0__0"}));
}
return ok(value_t::floating);
}
loc.reset(l.iter());
if(lex_integer::invoke(loc))
{
if(loc.iter() != loc.end())
{
const auto c = *loc.iter();
if(c == '_')
{
return err(format_underline("bad integer: `_` should be surrounded by digits",
{{source_location(loc), "here"}},
{"pass: -42, 1_000, 1_2_3_4_5, 0xC0FFEE, 0b0010, 0o755",
"fail: 1__000, 0123"}));
}
if('0' <= c && c <= '9')
{
// leading zero. point '0'
loc.retrace();
return err(format_underline("bad integer: leading zero",
{{source_location(loc), "here"}},
{"pass: -42, 1_000, 1_2_3_4_5, 0xC0FFEE, 0b0010, 0o755",
"fail: 1__000, 0123"}));
}
if(c == ':' || c == '-')
{
return err(format_underline("bad datetime: invalid format",
{{source_location(loc), "here"}},
{"pass: 1979-05-27T07:32:00-07:00, 1979-05-27 07:32:00.999999Z",
"fail: 1979-05-27T7:32:00-7:00, 1979-05-27 7:32-00:30"}));
}
if(c == '.' || c == 'e' || c == 'E')
{
return err(format_underline("bad float: invalid format",
{{source_location(loc), "here"}},
{"pass: +1.0, -2e-2, 3.141_592_653_589, inf, nan",
"fail: .0, 1., _1.0, 1.0_, 1_.0, 1.0__0"}));
}
}
return ok(value_t::integer);
}
if(loc.iter() != loc.end() && *loc.iter() == '.')
{
return err(format_underline("bad float: invalid format",
{{source_location(loc), "integer part required before this"}},
{"pass: +1.0, -2e-2, 3.141_592_653_589, inf, nan",
"fail: .0, 1., _1.0, 1.0_, 1_.0, 1.0__0"}));
}
if(loc.iter() != loc.end() && *loc.iter() == '_')
{
return err(format_underline("bad number: `_` should be surrounded by digits",
{{source_location(loc), "`_` is not surrounded by digits"}},
{"pass: -42, 1_000, 1_2_3_4_5, 0xC0FFEE, 0b0010, 0o755",
"fail: 1__000, 0123"}));
}
return err(format_underline("bad format: unknown value appeared",
{{source_location(loc), "here"}}));
}
inline result<value_t, std::string> guess_value_type(const location& loc)
{
switch(*loc.iter())
{
case '"' : {return ok(value_t::string); }
case '\'': {return ok(value_t::string); }
case 't' : {return ok(value_t::boolean); }
case 'f' : {return ok(value_t::boolean); }
case '[' : {return ok(value_t::array); }
case '{' : {return ok(value_t::table); }
case 'i' : {return ok(value_t::floating);} // inf.
case 'n' : {return ok(value_t::floating);} // nan.
default : {return guess_number_type(loc);}
}
}
template<typename Value, typename T>
result<Value, std::string>
parse_value_helper(result<std::pair<T, region>, std::string> rslt)
{
if(rslt.is_ok())
{
auto comments = rslt.as_ok().second.comments();
return ok(Value(std::move(rslt.as_ok()), std::move(comments)));
}
else
{
return err(std::move(rslt.as_err()));
}
}
template<typename Value>
result<Value, std::string> parse_value(location& loc)
{
const auto first = loc.iter();
if(first == loc.end())
{
return err(format_underline("toml::parse_value: input is empty",
{{source_location(loc), ""}}));
}
const auto type = guess_value_type(loc);
if(!type)
{
return err(type.unwrap_err());
}
switch(type.unwrap())
{
case value_t::boolean : {return parse_value_helper<Value>(parse_boolean(loc) );}
case value_t::integer : {return parse_value_helper<Value>(parse_integer(loc) );}
case value_t::floating : {return parse_value_helper<Value>(parse_floating(loc) );}
case value_t::string : {return parse_value_helper<Value>(parse_string(loc) );}
case value_t::offset_datetime: {return parse_value_helper<Value>(parse_offset_datetime(loc) );}
case value_t::local_datetime : {return parse_value_helper<Value>(parse_local_datetime(loc) );}
case value_t::local_date : {return parse_value_helper<Value>(parse_local_date(loc) );}
case value_t::local_time : {return parse_value_helper<Value>(parse_local_time(loc) );}
case value_t::array : {return parse_value_helper<Value>(parse_array<Value>(loc) );}
case value_t::table : {return parse_value_helper<Value>(parse_inline_table<Value>(loc));}
default:
{
const auto msg = format_underline("toml::parse_value: "
"unknown token appeared", {{source_location(loc), "unknown"}});
loc.reset(first);
return err(msg);
}
}
}
inline result<std::pair<std::vector<key>, region>, std::string>
parse_table_key(location& loc)
{
if(auto token = lex_std_table::invoke(loc))
{
location inner_loc(loc.name(), token.unwrap().str());
const auto open = lex_std_table_open::invoke(inner_loc);
if(!open || inner_loc.iter() == inner_loc.end())
{
throw internal_error(format_underline(
"toml::parse_table_key: no `[`",
{{source_location(inner_loc), "should be `[`"}}),
source_location(inner_loc));
}
// to skip [ a . b . c ]
// ^----------- this whitespace
lex_ws::invoke(inner_loc);
const auto keys = parse_key(inner_loc);
if(!keys)
{
throw internal_error(format_underline(
"toml::parse_table_key: invalid key",
{{source_location(inner_loc), "not key"}}),
source_location(inner_loc));
}
// to skip [ a . b . c ]
// ^-- this whitespace
lex_ws::invoke(inner_loc);
const auto close = lex_std_table_close::invoke(inner_loc);
if(!close)
{
throw internal_error(format_underline(
"toml::parse_table_key: no `]`",
{{source_location(inner_loc), "should be `]`"}}),
source_location(inner_loc));
}
// after [table.key], newline or EOF(empty table) required.
if(loc.iter() != loc.end())
{
using lex_newline_after_table_key =
sequence<maybe<lex_ws>, maybe<lex_comment>, lex_newline>;
const auto nl = lex_newline_after_table_key::invoke(loc);
if(!nl)
{
throw syntax_error(format_underline(
"toml::parse_table_key: newline required after [table.key]",
{{source_location(loc), "expected newline"}}),
source_location(loc));
}
}
return ok(std::make_pair(keys.unwrap().first, token.unwrap()));
}
else
{
return err(format_underline("toml::parse_table_key: "
"not a valid table key", {{source_location(loc), "here"}}));
}
}
inline result<std::pair<std::vector<key>, region>, std::string>
parse_array_table_key(location& loc)
{
if(auto token = lex_array_table::invoke(loc))
{
location inner_loc(loc.name(), token.unwrap().str());
const auto open = lex_array_table_open::invoke(inner_loc);
if(!open || inner_loc.iter() == inner_loc.end())
{
throw internal_error(format_underline(
"toml::parse_array_table_key: no `[[`",
{{source_location(inner_loc), "should be `[[`"}}),
source_location(inner_loc));
}
lex_ws::invoke(inner_loc);
const auto keys = parse_key(inner_loc);
if(!keys)
{
throw internal_error(format_underline(
"toml::parse_array_table_key: invalid key",
{{source_location(inner_loc), "not a key"}}),
source_location(inner_loc));
}
lex_ws::invoke(inner_loc);
const auto close = lex_array_table_close::invoke(inner_loc);
if(!close)
{
throw internal_error(format_underline(
"toml::parse_table_key: no `]]`",
{{source_location(inner_loc), "should be `]]`"}}),
source_location(inner_loc));
}
// after [[table.key]], newline or EOF(empty table) required.
if(loc.iter() != loc.end())
{
using lex_newline_after_table_key =
sequence<maybe<lex_ws>, maybe<lex_comment>, lex_newline>;
const auto nl = lex_newline_after_table_key::invoke(loc);
if(!nl)
{
throw syntax_error(format_underline("toml::"
"parse_array_table_key: newline required after [[table.key]]",
{{source_location(loc), "expected newline"}}),
source_location(loc));
}
}
return ok(std::make_pair(keys.unwrap().first, token.unwrap()));
}
else
{
return err(format_underline("toml::parse_array_table_key: "
"not a valid table key", {{source_location(loc), "here"}}));
}
}
// parse table body (key-value pairs until the iter hits the next [tablekey])
template<typename Value>
result<typename Value::table_type, std::string>
parse_ml_table(location& loc)
{
using value_type = Value;
using table_type = typename value_type::table_type;
const auto first = loc.iter();
if(first == loc.end())
{
return ok(table_type{});
}
// XXX at lest one newline is needed.
using skip_line = repeat<
sequence<maybe<lex_ws>, maybe<lex_comment>, lex_newline>, at_least<1>>;
skip_line::invoke(loc);
lex_ws::invoke(loc);
table_type tab;
while(loc.iter() != loc.end())
{
lex_ws::invoke(loc);
const auto before = loc.iter();
if(const auto tmp = parse_array_table_key(loc)) // next table found
{
loc.reset(before);
return ok(tab);
}
if(const auto tmp = parse_table_key(loc)) // next table found
{
loc.reset(before);
return ok(tab);
}
if(const auto kv = parse_key_value_pair<value_type>(loc))
{
const auto& kvpair = kv.unwrap();
const std::vector<key>& keys = kvpair.first.first;
const auto& key_reg = kvpair.first.second;
const value_type& val = kvpair.second;
const auto inserted =
insert_nested_key(tab, val, keys.begin(), keys.end(), key_reg);
if(!inserted)
{
return err(inserted.unwrap_err());
}
}
else
{
return err(kv.unwrap_err());
}
// comment lines are skipped by the above function call.
// However, since the `skip_line` requires at least 1 newline, it fails
// if the file ends with ws and/or comment without newline.
// `skip_line` matches `ws? + comment? + newline`, not `ws` or `comment`
// itself. To skip the last ws and/or comment, call lexers.
// It does not matter if these fails, so the return value is discarded.
lex_ws::invoke(loc);
lex_comment::invoke(loc);
// skip_line is (whitespace? comment? newline)_{1,}. multiple empty lines
// and comments after the last key-value pairs are allowed.
const auto newline = skip_line::invoke(loc);
if(!newline && loc.iter() != loc.end())
{
const auto before2 = loc.iter();
lex_ws::invoke(loc); // skip whitespace
const auto msg = format_underline("toml::parse_table: "
"invalid line format", {{source_location(loc), concat_to_string(
"expected newline, but got '", show_char(*loc.iter()), "'.")}});
loc.reset(before2);
return err(msg);
}
// the skip_lines only matches with lines that includes newline.
// to skip the last line that includes comment and/or whitespace
// but no newline, call them one more time.
lex_ws::invoke(loc);
lex_comment::invoke(loc);
}
return ok(tab);
}
template<typename Value>
result<Value, std::string> parse_toml_file(location& loc)
{
using value_type = Value;
using table_type = typename value_type::table_type;
const auto first = loc.iter();
if(first == loc.end())
{
// For empty files, return an empty table with an empty region (zero-length).
// Without the region, error messages would miss the filename.
return ok(value_type(table_type{}, region(loc, first, first), {}));
}
// put the first line as a region of a file
// Here first != loc.end(), so taking std::next is okay
const region file(loc, first, std::next(loc.iter()));
// The first successive comments that are separated from the first value
// by an empty line are for a file itself.
// ```toml
// # this is a comment for a file.
//
// key = "the first value"
// ```
// ```toml
// # this is a comment for "the first value".
// key = "the first value"
// ```
std::vector<std::string> comments;
using lex_first_comments = sequence<
repeat<sequence<maybe<lex_ws>, lex_comment, lex_newline>, at_least<1>>,
sequence<maybe<lex_ws>, lex_newline>
>;
if(const auto token = lex_first_comments::invoke(loc))
{
location inner_loc(loc.name(), token.unwrap().str());
while(inner_loc.iter() != inner_loc.end())
{
maybe<lex_ws>::invoke(inner_loc); // remove ws if exists
if(lex_newline::invoke(inner_loc))
{
assert(inner_loc.iter() == inner_loc.end());
break; // empty line found.
}
auto com = lex_comment::invoke(inner_loc).unwrap().str();
com.erase(com.begin()); // remove # sign
comments.push_back(std::move(com));
lex_newline::invoke(inner_loc);
}
}
table_type data;
// root object is also a table, but without [tablename]
if(const auto tab = parse_ml_table<value_type>(loc))
{
data = std::move(tab.unwrap());
}
else // failed (empty table is regarded as success in parse_ml_table)
{
return err(tab.unwrap_err());
}
while(loc.iter() != loc.end())
{
// here, the region of [table] is regarded as the table-key because
// the table body is normally too big and it is not so informative
// if the first key-value pair of the table is shown in the error
// message.
if(const auto tabkey = parse_array_table_key(loc))
{
const auto tab = parse_ml_table<value_type>(loc);
if(!tab){return err(tab.unwrap_err());}
const auto& tk = tabkey.unwrap();
const auto& keys = tk.first;
const auto& reg = tk.second;
const auto inserted = insert_nested_key(data,
value_type(tab.unwrap(), reg, reg.comments()),
keys.begin(), keys.end(), reg,
/*is_array_of_table=*/ true);
if(!inserted) {return err(inserted.unwrap_err());}
continue;
}
if(const auto tabkey = parse_table_key(loc))
{
const auto tab = parse_ml_table<value_type>(loc);
if(!tab){return err(tab.unwrap_err());}
const auto& tk = tabkey.unwrap();
const auto& keys = tk.first;
const auto& reg = tk.second;
const auto inserted = insert_nested_key(data,
value_type(tab.unwrap(), reg, reg.comments()),
keys.begin(), keys.end(), reg);
if(!inserted) {return err(inserted.unwrap_err());}
continue;
}
return err(format_underline("toml::parse_toml_file: "
"unknown line appeared", {{source_location(loc), "unknown format"}}));
}
return ok(Value(std::move(data), file, comments));
}
} // detail
template<typename Comment = TOML11_DEFAULT_COMMENT_STRATEGY,
template<typename ...> class Table = std::unordered_map,
template<typename ...> class Array = std::vector>
basic_value<Comment, Table, Array>
parse(std::istream& is, const std::string& fname = "unknown file")
{
using value_type = basic_value<Comment, Table, Array>;
const auto beg = is.tellg();
is.seekg(0, std::ios::end);
const auto end = is.tellg();
const auto fsize = end - beg;
is.seekg(beg);
// read whole file as a sequence of char
assert(fsize >= 0);
std::vector<char> letters(static_cast<std::size_t>(fsize));
is.read(letters.data(), fsize);
// append LF.
// Although TOML does not require LF at the EOF, to make parsing logic
// simpler, we "normalize" the content by adding LF if it does not exist.
// It also checks if the last char is CR, to avoid changing the meaning.
// This is not the *best* way to deal with the last character, but is a
// simple and quick fix.
if(!letters.empty() && letters.back() != '\n' && letters.back() != '\r')
{
letters.push_back('\n');
}
detail::location loc(std::move(fname), std::move(letters));
// skip BOM if exists.
// XXX component of BOM (like 0xEF) exceeds the representable range of
// signed char, so on some (actually, most) of the environment, these cannot
// be compared to char. However, since we are always out of luck, we need to
// check our chars are equivalent to BOM. To do this, first we need to
// convert char to unsigned char to guarantee the comparability.
if(loc.source()->size() >= 3)
{
std::array<unsigned char, 3> BOM;
std::memcpy(BOM.data(), loc.source()->data(), 3);
if(BOM[0] == 0xEF && BOM[1] == 0xBB && BOM[2] == 0xBF)
{
loc.advance(3); // BOM found. skip.
}
}
const auto data = detail::parse_toml_file<value_type>(loc);
if(!data)
{
throw syntax_error(data.unwrap_err(), source_location(loc));
}
return data.unwrap();
}
template<typename Comment = TOML11_DEFAULT_COMMENT_STRATEGY,
template<typename ...> class Table = std::unordered_map,
template<typename ...> class Array = std::vector>
basic_value<Comment, Table, Array> parse(const std::string& fname)
{
std::ifstream ifs(fname.c_str(), std::ios_base::binary);
if(!ifs.good())
{
throw std::runtime_error("toml::parse: file open error -> " + fname);
}
return parse<Comment, Table, Array>(ifs, fname);
}
#ifdef TOML11_HAS_STD_FILESYSTEM
// This function just forwards `parse("filename.toml")` to std::string version
// to avoid the ambiguity in overload resolution.
//
// Both std::string and std::filesystem::path are convertible from const char*.
// Without this, both parse(std::string) and parse(std::filesystem::path)
// matches to parse("filename.toml"). This breaks the existing code.
//
// This function exactly matches to the invocation with c-string.
// So this function is preferred than others and the ambiguity disappears.
template<typename Comment = TOML11_DEFAULT_COMMENT_STRATEGY,
template<typename ...> class Table = std::unordered_map,
template<typename ...> class Array = std::vector>
basic_value<Comment, Table, Array> parse(const char* fname)
{
return parse<Comment, Table, Array>(std::string(fname));
}
template<typename Comment = TOML11_DEFAULT_COMMENT_STRATEGY,
template<typename ...> class Table = std::unordered_map,
template<typename ...> class Array = std::vector>
basic_value<Comment, Table, Array> parse(const std::filesystem::path& fpath)
{
std::ifstream ifs(fpath, std::ios_base::binary);
if(!ifs.good())
{
throw std::runtime_error("toml::parse: file open error -> " +
fpath.string());
}
return parse<Comment, Table, Array>(ifs, fpath.string());
}
#endif // TOML11_HAS_STD_FILESYSTEM
} // toml
#endif// TOML11_PARSER_HPP
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