mirror of
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296 lines
14 KiB
C++
296 lines
14 KiB
C++
// Copyright Toru Niina 2017.
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// Distributed under the MIT License.
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#ifndef TOML11_LEXER_HPP
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#define TOML11_LEXER_HPP
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#include "combinator.hpp"
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#include <stdexcept>
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#include <istream>
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#include <sstream>
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#include <fstream>
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namespace toml
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{
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namespace detail
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{
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// these scans contents from current location in a container of char
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// and extract a region that matches their own pattern.
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// to see the implementation of each component, see combinator.hpp.
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using lex_wschar = either<character<' '>, character<'\t'>>;
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using lex_ws = repeat<lex_wschar, at_least<1>>;
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using lex_newline = either<character<'\n'>,
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sequence<character<'\r'>, character<'\n'>>>;
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using lex_lower = in_range<'a', 'z'>;
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using lex_upper = in_range<'A', 'Z'>;
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using lex_alpha = either<lex_lower, lex_upper>;
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using lex_digit = in_range<'0', '9'>;
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using lex_nonzero = in_range<'1', '9'>;
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using lex_oct_dig = in_range<'0', '7'>;
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using lex_bin_dig = in_range<'0', '1'>;
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using lex_hex_dig = either<lex_digit, in_range<'A', 'F'>, in_range<'a', 'f'>>;
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using lex_hex_prefix = sequence<character<'0'>, character<'x'>>;
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using lex_oct_prefix = sequence<character<'0'>, character<'o'>>;
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using lex_bin_prefix = sequence<character<'0'>, character<'b'>>;
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using lex_underscore = character<'_'>;
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using lex_plus = character<'+'>;
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using lex_minus = character<'-'>;
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using lex_sign = either<lex_plus, lex_minus>;
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// digit | nonzero 1*(digit | _ digit)
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using lex_unsigned_dec_int = either<sequence<lex_nonzero, repeat<
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either<lex_digit, sequence<lex_underscore, lex_digit>>, at_least<1>>>,
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lex_digit>;
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// (+|-)? unsigned_dec_int
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using lex_dec_int = sequence<maybe<lex_sign>, lex_unsigned_dec_int>;
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// hex_prefix hex_dig *(hex_dig | _ hex_dig)
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using lex_hex_int = sequence<lex_hex_prefix, sequence<lex_hex_dig, repeat<
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either<lex_hex_dig, sequence<lex_underscore, lex_hex_dig>>, unlimited>>>;
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// oct_prefix oct_dig *(oct_dig | _ oct_dig)
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using lex_oct_int = sequence<lex_oct_prefix, sequence<lex_oct_dig, repeat<
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either<lex_oct_dig, sequence<lex_underscore, lex_oct_dig>>, unlimited>>>;
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// bin_prefix bin_dig *(bin_dig | _ bin_dig)
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using lex_bin_int = sequence<lex_bin_prefix, sequence<lex_bin_dig, repeat<
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either<lex_bin_dig, sequence<lex_underscore, lex_bin_dig>>, unlimited>>>;
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// (dec_int | hex_int | oct_int | bin_int)
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using lex_integer = either<lex_bin_int, lex_oct_int, lex_hex_int, lex_dec_int>;
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// ===========================================================================
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using lex_inf = sequence<character<'i'>, character<'n'>, character<'f'>>;
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using lex_nan = sequence<character<'n'>, character<'a'>, character<'n'>>;
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using lex_special_float = sequence<maybe<lex_sign>, either<lex_inf, lex_nan>>;
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using lex_zero_prefixable_int = sequence<lex_digit, repeat<either<lex_digit,
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sequence<lex_underscore, lex_digit>>, unlimited>>;
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using lex_fractional_part = sequence<character<'.'>, lex_zero_prefixable_int>;
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#ifdef TOML11_USE_UNRELEASED_TOML_FEATURES
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// use toml-lang/toml HEAD
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using lex_exponent_part = sequence<either<character<'e'>, character<'E'>>,
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maybe<lex_sign>, lex_zero_prefixable_int>;
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#else
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// strictly TOML v0.5.0
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using lex_exponent_part = sequence<either<character<'e'>, character<'E'>>,
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lex_dec_int>;
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#endif
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using lex_float = either<lex_special_float,
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sequence<lex_dec_int, either<lex_exponent_part,
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sequence<lex_fractional_part, maybe<lex_exponent_part>>>>>;
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// ===========================================================================
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using lex_true = sequence<character<'t'>, character<'r'>,
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character<'u'>, character<'e'>>;
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using lex_false = sequence<character<'f'>, character<'a'>, character<'l'>,
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character<'s'>, character<'e'>>;
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using lex_boolean = either<lex_true, lex_false>;
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// ===========================================================================
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using lex_date_fullyear = repeat<lex_digit, exactly<4>>;
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using lex_date_month = repeat<lex_digit, exactly<2>>;
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using lex_date_mday = repeat<lex_digit, exactly<2>>;
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using lex_time_delim = either<character<'T'>, character<'t'>, character<' '>>;
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using lex_time_hour = repeat<lex_digit, exactly<2>>;
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using lex_time_minute = repeat<lex_digit, exactly<2>>;
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using lex_time_second = repeat<lex_digit, exactly<2>>;
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using lex_time_secfrac = sequence<character<'.'>,
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repeat<lex_digit, at_least<1>>>;
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using lex_time_numoffset = sequence<either<character<'+'>, character<'-'>>,
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sequence<lex_time_hour, character<':'>,
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lex_time_minute>>;
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using lex_time_offset = either<character<'Z'>, character<'z'>,
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lex_time_numoffset>;
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using lex_partial_time = sequence<lex_time_hour, character<':'>,
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lex_time_minute, character<':'>,
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lex_time_second, maybe<lex_time_secfrac>>;
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using lex_full_date = sequence<lex_date_fullyear, character<'-'>,
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lex_date_month, character<'-'>,
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lex_date_mday>;
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using lex_full_time = sequence<lex_partial_time, lex_time_offset>;
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using lex_offset_date_time = sequence<lex_full_date, lex_time_delim, lex_full_time>;
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using lex_local_date_time = sequence<lex_full_date, lex_time_delim, lex_partial_time>;
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using lex_local_date = lex_full_date;
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using lex_local_time = lex_partial_time;
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// ===========================================================================
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using lex_quotation_mark = character<'"'>;
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#ifdef TOML11_USE_UNRELEASED_TOML_FEATURES
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using lex_basic_unescaped = exclude<either<in_range<0x00, 0x08>, // 0x09 (tab)
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in_range<0x0a, 0x1F>, // is allowed
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character<0x22>, character<0x5C>,
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character<0x7F>>>;
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#else
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using lex_basic_unescaped = exclude<either<in_range<0x00, 0x1F>,
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character<0x22>, character<0x5C>,
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character<0x7F>>>;
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#endif
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using lex_escape = character<'\\'>;
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using lex_escape_unicode_short = sequence<character<'u'>,
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repeat<lex_hex_dig, exactly<4>>>;
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using lex_escape_unicode_long = sequence<character<'U'>,
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repeat<lex_hex_dig, exactly<8>>>;
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using lex_escape_seq_char = either<character<'"'>, character<'\\'>,
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character<'b'>, character<'f'>,
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character<'n'>, character<'r'>,
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character<'t'>,
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lex_escape_unicode_short,
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lex_escape_unicode_long
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>;
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using lex_escaped = sequence<lex_escape, lex_escape_seq_char>;
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using lex_basic_char = either<lex_basic_unescaped, lex_escaped>;
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using lex_basic_string = sequence<lex_quotation_mark,
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repeat<lex_basic_char, unlimited>,
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lex_quotation_mark>;
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// After toml post-v0.5.0, it is explicitly clarified how quotes in ml-strings
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// are allowed to be used.
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// After this, the following strings are *explicitly* allowed.
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// - One or two `"`s in a multi-line basic string is allowed wherever it is.
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// - Three consecutive `"`s in a multi-line basic string is considered as a delimiter.
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// - One or two `"`s can appear just before or after the delimiter.
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// ```toml
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// str4 = """Here are two quotation marks: "". Simple enough."""
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// str5 = """Here are three quotation marks: ""\"."""
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// str6 = """Here are fifteen quotation marks: ""\"""\"""\"""\"""\"."""
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// str7 = """"This," she said, "is just a pointless statement.""""
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// ```
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// In the current implementation (v3.3.0), it is difficult to parse `str7` in
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// the above example. It is difficult to recognize `"` at the end of string body
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// collectly. It will be misunderstood as a `"""` delimiter and an additional,
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// invalid `"`. Like this:
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// ```console
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// what(): [error] toml::parse_table: invalid line format
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// --> hoge.toml
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// |
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// 13 | str7 = """"This," she said, "is just a pointless statement.""""
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// | ^- expected newline, but got '"'.
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// ```
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// As a quick workaround for this problem, `lex_ml_basic_string_delim` was
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// splitted into two, `lex_ml_basic_string_open` and `lex_ml_basic_string_close`.
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// `lex_ml_basic_string_open` allows only `"""`. `_close` allows 3-5 `"`s.
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// In parse_ml_basic_string() function, the trailing `"`s will be attached to
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// the string body.
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//
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// Note: This feature is a "clarification". Therefore this change is considered
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// as a spec that has been defined since the time when the multi-line
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// basic string was introduced. Although it is a post-v0.5.0 changes,
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// this change will be activated regardless of the flag,
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// `TOML11_USE_UNRELEASED_TOML_FEATURES`.
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//
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using lex_ml_basic_string_delim = repeat<lex_quotation_mark, exactly<3>>;
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using lex_ml_basic_string_open = lex_ml_basic_string_delim;
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using lex_ml_basic_string_close = sequence<
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repeat<lex_quotation_mark, exactly<3>>,
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maybe<lex_quotation_mark>, maybe<lex_quotation_mark>
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>;
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#ifdef TOML11_USE_UNRELEASED_TOML_FEATURES
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using lex_ml_basic_unescaped = exclude<either<in_range<0x00, 0x08>, // 0x09
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in_range<0x0a, 0x1F>, // is tab
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character<0x5C>, // backslash
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character<0x7F>, // DEL
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lex_ml_basic_string_delim>>;
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#else // TOML v0.5.0
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using lex_ml_basic_unescaped = exclude<either<in_range<0x00,0x1F>,
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character<0x5C>,
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character<0x7F>,
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lex_ml_basic_string_delim>>;
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#endif
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using lex_ml_basic_escaped_newline = sequence<
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lex_escape, maybe<lex_ws>, lex_newline,
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repeat<either<lex_ws, lex_newline>, unlimited>>;
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using lex_ml_basic_char = either<lex_ml_basic_unescaped, lex_escaped>;
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using lex_ml_basic_body = repeat<either<lex_ml_basic_char, lex_newline,
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lex_ml_basic_escaped_newline>,
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unlimited>;
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using lex_ml_basic_string = sequence<lex_ml_basic_string_open,
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lex_ml_basic_body,
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lex_ml_basic_string_close>;
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using lex_literal_char = exclude<either<in_range<0x00, 0x08>,
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in_range<0x10, 0x19>, character<0x27>>>;
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using lex_apostrophe = character<'\''>;
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using lex_literal_string = sequence<lex_apostrophe,
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repeat<lex_literal_char, unlimited>,
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lex_apostrophe>;
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// the same reason as above.
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using lex_ml_literal_string_delim = repeat<lex_apostrophe, exactly<3>>;
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using lex_ml_literal_string_open = lex_ml_literal_string_delim;
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using lex_ml_literal_string_close = sequence<
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repeat<lex_apostrophe, exactly<3>>,
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maybe<lex_apostrophe>, maybe<lex_apostrophe>
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>;
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using lex_ml_literal_char = exclude<either<in_range<0x00, 0x08>,
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in_range<0x10, 0x1F>,
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character<0x7F>,
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lex_ml_literal_string_delim>>;
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using lex_ml_literal_body = repeat<either<lex_ml_literal_char, lex_newline>,
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unlimited>;
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using lex_ml_literal_string = sequence<lex_ml_literal_string_open,
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lex_ml_literal_body,
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lex_ml_literal_string_close>;
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using lex_string = either<lex_ml_basic_string, lex_basic_string,
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lex_ml_literal_string, lex_literal_string>;
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// ===========================================================================
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using lex_comment_start_symbol = character<'#'>;
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using lex_non_eol = either<character<'\t'>, exclude<in_range<0x00, 0x19>>>;
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using lex_comment = sequence<lex_comment_start_symbol,
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repeat<lex_non_eol, unlimited>>;
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using lex_dot_sep = sequence<maybe<lex_ws>, character<'.'>, maybe<lex_ws>>;
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using lex_unquoted_key = repeat<either<lex_alpha, lex_digit,
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character<'-'>, character<'_'>>,
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at_least<1>>;
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using lex_quoted_key = either<lex_basic_string, lex_literal_string>;
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using lex_simple_key = either<lex_unquoted_key, lex_quoted_key>;
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using lex_dotted_key = sequence<lex_simple_key,
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repeat<sequence<lex_dot_sep, lex_simple_key>,
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at_least<1>
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>
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>;
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using lex_key = either<lex_dotted_key, lex_simple_key>;
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using lex_keyval_sep = sequence<maybe<lex_ws>,
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character<'='>,
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maybe<lex_ws>>;
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using lex_std_table_open = character<'['>;
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using lex_std_table_close = character<']'>;
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using lex_std_table = sequence<lex_std_table_open,
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maybe<lex_ws>,
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lex_key,
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maybe<lex_ws>,
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lex_std_table_close>;
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using lex_array_table_open = sequence<lex_std_table_open, lex_std_table_open>;
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using lex_array_table_close = sequence<lex_std_table_close, lex_std_table_close>;
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using lex_array_table = sequence<lex_array_table_open,
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maybe<lex_ws>,
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lex_key,
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maybe<lex_ws>,
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lex_array_table_close>;
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} // detail
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} // toml
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#endif // TOML_LEXER_HPP
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