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#[macro_export]
macro_rules! char_class {
($c: expr, [$head:expr]) => ($c == $head);
($c: expr, [$head:expr $(, $cs:expr)+]) => ($c == $head || char_class!($c, [$($cs),*]));
}
#[macro_export]
macro_rules! symbolic_control_char {
($c: expr) => (char_class!($c, ['a', 'b', 'f', 'n', 'r', 't', 'v', '0']))
}
#[macro_export]
macro_rules! space_char {
($c: expr) => ($c == ' ')
}
#[macro_export]
macro_rules! layout_char {
($c: expr) => (char_class!($c, [' ', '\n', '\t', '\u{0B}', '\u{0C}']))
}
#[macro_export]
macro_rules! symbolic_hexadecimal_char {
($c: expr) => ($c == 'x')
}
#[macro_export]
macro_rules! octal_digit_char {
($c: expr) => ($c >= '0' && $c <= '7')
}
#[macro_export]
macro_rules! binary_digit_char {
($c: expr) => ($c >= '0' && $c <= '1')
}
#[macro_export]
macro_rules! hexadecimal_digit_char {
($c: expr) => ($c >= '0' && $c <= '9' ||
$c >= 'A' && $c <= 'F' ||
$c >= 'a' && $c <= 'f')
}
#[macro_export]
macro_rules! exponent_char {
($c: expr) => ($c == 'e' || $c == 'E')
}
#[macro_export]
macro_rules! sign_char {
($c: expr) => ($c == '-' || $c == '+')
}
#[macro_export]
macro_rules! new_line_char {
($c: expr) => ($c == '\n')
}
#[macro_export]
macro_rules! end_line_comment_char {
($c: expr) => ($c == '%')
}
#[macro_export]
macro_rules! comment_1_char {
($c: expr) => ($c == '/')
}
#[macro_export]
macro_rules! comment_2_char {
($c: expr) => ($c == '*')
}
#[macro_export]
macro_rules! capital_letter_char {
($c: expr) => ($c >= 'A' && $c <= 'Z')
}
#[macro_export]
macro_rules! small_letter_char {
($c: expr) => ($c >= 'a' && $c <= 'z')
}
#[macro_export]
macro_rules! variable_indicator_char {
($c: expr) => ($c == '_')
}
#[macro_export]
macro_rules! graphic_char {
($c: expr) => (char_class!($c, ['#', '$', '&', '*', '+', '-', '.', '/', ':',
'<', '=', '>', '?', '@', '^', '~']))
}
#[macro_export]
macro_rules! graphic_token_char {
($c: expr) => (graphic_char!($c) || backslash_char!($c))
}
#[macro_export]
macro_rules! alpha_char {
($c: expr) =>
(match $c {
'a' ..= 'z' => true,
'A' ..= 'Z' => true,
'_' => true,
'\u{00A0}' ..= '\u{00BF}' => true,
'\u{00C0}' ..= '\u{00D6}' => true,
'\u{00D8}' ..= '\u{00F6}' => true,
'\u{00F8}' ..= '\u{00FF}' => true,
'\u{0100}' ..= '\u{017F}' => true,
'\u{0180}' ..= '\u{024F}' => true,
'\u{0250}' ..= '\u{02AF}' => true,
'\u{02B0}' ..= '\u{02FF}' => true,
'\u{0300}' ..= '\u{036F}' => true,
'\u{0370}' ..= '\u{03FF}' => true,
'\u{0400}' ..= '\u{04FF}' => true,
'\u{0500}' ..= '\u{052F}' => true,
'\u{0530}' ..= '\u{058F}' => true,
'\u{0590}' ..= '\u{05FF}' => true,
'\u{0600}' ..= '\u{06FF}' => true,
'\u{0700}' ..= '\u{074F}' => true,
_ => false
})
}
#[macro_export]
macro_rules! decimal_digit_char {
($c: expr) => ($c >= '0' && $c <= '9')
}
#[macro_export]
macro_rules! decimal_point_char {
($c: expr) => ($c == '.')
}
#[macro_export]
macro_rules! alpha_numeric_char {
($c: expr) => (alpha_char!($c) || decimal_digit_char!($c))
}
#[macro_export]
macro_rules! cut_char {
($c: expr) => ($c == '!')
}
#[macro_export]
macro_rules! semicolon_char {
($c: expr) => ($c == ';')
}
#[macro_export]
macro_rules! backslash_char {
($c: expr) => ($c == '\\')
}
#[macro_export]
macro_rules! single_quote_char {
($c: expr) => ($c == '\'')
}
#[macro_export]
macro_rules! double_quote_char {
($c: expr) => ($c == '"')
}
#[macro_export]
macro_rules! back_quote_char {
($c: expr) => ($c == '`')
}
#[macro_export]
macro_rules! meta_char {
($c: expr) => ( char_class!($c, ['\\', '\'', '"', '`']) )
}
#[macro_export]
macro_rules! solo_char {
($c: expr) => ( char_class!($c, ['!', '(', ')', ',', ';', '[', ']',
'{', '}', '|', '%']) )
}
#[macro_export]
macro_rules! prolog_char {
($c: expr) => (graphic_char!($c) || alpha_numeric_char!($c) || solo_char!($c) ||
layout_char!($c) || meta_char!($c))
}