godot/core/string/char_utils.h

/**************************************************************************/
/*  char_utils.h                                                          */
/**************************************************************************/
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/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#pragma once

#include "core/typedefs.h"

#include "char_range.inc"

#include <iterator>

static constexpr char hex_char_table_upper[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
static constexpr char hex_char_table_lower[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

#define BSEARCH_CHAR_RANGE(m_array)                \
	int low = 0;                                   \
	int high = std::size(m_array) - 1;             \
	int middle = (low + high) / 2;                 \
                                                   \
	while (low <= high) {                          \
		if (p_char < m_array[middle].start) {      \
			high = middle - 1;                     \
		} else if (p_char > m_array[middle].end) { \
			low = middle + 1;                      \
		} else {                                   \
			return true;                           \
		}                                          \
                                                   \
		middle = (low + high) / 2;                 \
	}                                              \
                                                   \
	return false

constexpr bool is_unicode_identifier_start(char32_t p_char) {
	BSEARCH_CHAR_RANGE(xid_start);
}

constexpr bool is_unicode_identifier_continue(char32_t p_char) {
	BSEARCH_CHAR_RANGE(xid_continue);
}

constexpr bool is_unicode_upper_case(char32_t p_char) {
	BSEARCH_CHAR_RANGE(uppercase_letter);
}

constexpr bool is_unicode_lower_case(char32_t p_char) {
	BSEARCH_CHAR_RANGE(lowercase_letter);
}

constexpr bool is_unicode_letter(char32_t p_char) {
	BSEARCH_CHAR_RANGE(unicode_letter);
}

#undef BSEARCH_CHAR_RANGE

constexpr bool is_ascii_upper_case(char32_t p_char) {
	return (p_char >= 'A' && p_char <= 'Z');
}

constexpr bool is_ascii_lower_case(char32_t p_char) {
	return (p_char >= 'a' && p_char <= 'z');
}

constexpr bool is_digit(char32_t p_char) {
	return (p_char >= '0' && p_char <= '9');
}

constexpr bool is_hex_digit(char32_t p_char) {
	return (is_digit(p_char) || (p_char >= 'a' && p_char <= 'f') || (p_char >= 'A' && p_char <= 'F'));
}

constexpr bool is_binary_digit(char32_t p_char) {
	return (p_char == '0' || p_char == '1');
}

constexpr bool is_ascii_alphabet_char(char32_t p_char) {
	return (p_char >= 'a' && p_char <= 'z') || (p_char >= 'A' && p_char <= 'Z');
}

constexpr bool is_ascii_alphanumeric_char(char32_t p_char) {
	return (p_char >= 'a' && p_char <= 'z') || (p_char >= 'A' && p_char <= 'Z') || (p_char >= '0' && p_char <= '9');
}

constexpr bool is_ascii_identifier_char(char32_t p_char) {
	return (p_char >= 'a' && p_char <= 'z') || (p_char >= 'A' && p_char <= 'Z') || (p_char >= '0' && p_char <= '9') || p_char == '_';
}

constexpr bool is_symbol(char32_t p_char) {
	return p_char != '_' && ((p_char >= '!' && p_char <= '/') || (p_char >= ':' && p_char <= '@') || (p_char >= '[' && p_char <= '`') || (p_char >= '{' && p_char <= '~') || p_char == '\t' || p_char == ' ');
}

constexpr bool is_control(char32_t p_char) {
	return (p_char <= 0x001f) || (p_char >= 0x007f && p_char <= 0x009f);
}

constexpr bool is_whitespace(char32_t p_char) {
	return (p_char == ' ') || (p_char == 0x00a0) || (p_char == 0x1680) || (p_char >= 0x2000 && p_char <= 0x200b) || (p_char == 0x202f) || (p_char == 0x205f) || (p_char == 0x3000) || (p_char == 0x2028) || (p_char == 0x2029) || (p_char >= 0x0009 && p_char <= 0x000d) || (p_char == 0x0085);
}

constexpr bool is_linebreak(char32_t p_char) {
	return (p_char >= 0x000a && p_char <= 0x000d) || (p_char == 0x0085) || (p_char == 0x2028) || (p_char == 0x2029);
}

constexpr bool is_punct(char32_t p_char) {
	return (p_char >= ' ' && p_char <= '/') || (p_char >= ':' && p_char <= '@') || (p_char >= '[' && p_char <= '^') || (p_char == '`') || (p_char >= '{' && p_char <= '~') || (p_char >= 0x2000 && p_char <= 0x206f) || (p_char >= 0x3000 && p_char <= 0x303f);
}

constexpr bool is_underscore(char32_t p_char) {
	return (p_char == '_');
}

constexpr bool is_hyphen(char32_t p_char) {
	return (p_char == '-') || (p_char == 0x2010) || (p_char == 0x2011);
}