pub fn new(pattern: &str) -> Result<Self, PatternError> {
        let chars = pattern.chars().collect::<Vec<_>>();
        let mut tokens = Vec::new();
        let mut is_recursive = false;
        let mut i = 0;

        while i < chars.len() {
            match chars[i] {
                '?' => {
                    tokens.push(AnyChar);
                    i += 1;
                }
                '*' => {
                    let old = i;

                    while i < chars.len() && chars[i] == '*' {
                        i += 1;
                    }

                    let count = i - old;

                    if count > 2 {
                        return Err(PatternError {
                            pos: old + 2,
                            msg: ERROR_WILDCARDS,
                        });
                    } else if count == 2 {
                        // ** can only be an entire path component
                        // i.e. a/**/b is valid, but a**/b or a/**b is not
                        // invalid matches are treated literally
                        let is_valid = if i == 2 || path::is_separator(chars[i - count - 1]) {
                            // it ends in a '/'
                            if i < chars.len() && path::is_separator(chars[i]) {
                                i += 1;
                                true
                            // or the pattern ends here
                            // this enables the existing globbing mechanism
                            } else if i == chars.len() {
                                true
                            // `**` ends in non-separator
                            } else {
                                return Err(PatternError {
                                    pos: i,
                                    msg: ERROR_RECURSIVE_WILDCARDS,
                                });
                            }
                        // `**` begins with non-separator
                        } else {
                            return Err(PatternError {
                                pos: old - 1,
                                msg: ERROR_RECURSIVE_WILDCARDS,
                            });
                        };

                        if is_valid {
                            // collapse consecutive AnyRecursiveSequence to a
                            // single one

                            let tokens_len = tokens.len();

                            if !(tokens_len > 1 && tokens[tokens_len - 1] == AnyRecursiveSequence) {
                                is_recursive = true;
                                tokens.push(AnyRecursiveSequence);
                            }
                        }
                    } else {
                        tokens.push(AnySequence);
                    }
                }
                '[' => {
                    if i + 4 <= chars.len() && chars[i + 1] == '!' {
                        match chars[i + 3..].iter().position(|x| *x == ']') {
                            None => (),
                            Some(j) => {
                                let chars = &chars[i + 2..i + 3 + j];
                                let cs = parse_char_specifiers(chars);
                                tokens.push(AnyExcept(cs));
                                i += j + 4;
                                continue;
                            }
                        }
                    } else if i + 3 <= chars.len() && chars[i + 1] != '!' {
                        match chars[i + 2..].iter().position(|x| *x == ']') {
                            None => (),
                            Some(j) => {
                                let cs = parse_char_specifiers(&chars[i + 1..i + 2 + j]);
                                tokens.push(AnyWithin(cs));
                                i += j + 3;
                                continue;
                            }
                        }
                    }

                    // if we get here then this is not a valid range pattern
                    return Err(PatternError {
                        pos: i,
                        msg: ERROR_INVALID_RANGE,
                    });
                }
                c => {
                    tokens.push(Char(c));
                    i += 1;
                }
            }
        }

        Ok(Self {
            tokens,
            original: pattern.to_string(),
            is_recursive,
        })
    }
/// This function compiles Unix shell style patterns.
///
/// An invalid glob pattern will yield a `PatternError`.
This function compiles Unix shell style patterns.
An invalid glob pattern will yield a `PatternError`.
This function compiles Unix shell style patterns . An invalid glob pattern will yield a ` PatternError ` .
pub fn new(pattern: &str) -> Result<Self, PatternError> {
        let chars = pattern.chars().collect::<Vec<_>>();
        let mut tokens = Vec::new();
        let mut is_recursive = false;
        let mut i = 0;
        while i < chars.len() {
            match chars[i] {
                '?' => {
                    tokens.push(AnyChar);
                    i += 1;
                }
                '*' => {
                    let old = i;
                    while i < chars.len() && chars[i] == '*' {
                        i += 1;
                    }
                    let count = i - old;
                    if count > 2 {
                        return Err(PatternError {
                            pos: old + 2,
                            msg: ERROR_WILDCARDS,
                        });
                    } else if count == 2 {
                        // ** can only be an entire path component
                        // i.e. a/**/b is valid, but a**/b or a/**b is not
                        // invalid matches are treated literally
                        let is_valid = if i == 2 || path::is_separator(chars[i - count - 1]) {
                            // it ends in a '/'
                            if i < chars.len() && path::is_separator(chars[i]) {
                                i += 1;
                                true
                            // or the pattern ends here
                            // this enables the existing globbing mechanism
                            } else if i == chars.len() {
                                true
                            // `**` ends in non-separator
                            } else {
                                return Err(PatternError {
                                    pos: i,
                                    msg: ERROR_RECURSIVE_WILDCARDS,
                                });
                            }
                        // `**` begins with non-separator
                        } else {
                            return Err(PatternError {
                                pos: old - 1,
                                msg: ERROR_RECURSIVE_WILDCARDS,
                            });
                        };
                        if is_valid {
                            // collapse consecutive AnyRecursiveSequence to a
                            // single one
                            let tokens_len = tokens.len();
                            if !(tokens_len > 1 && tokens[tokens_len - 1] == AnyRecursiveSequence) {
                                is_recursive = true;
                                tokens.push(AnyRecursiveSequence);
                            }
                        }
                    } else {
                        tokens.push(AnySequence);
                    }
                }
                '[' => {
                    if i + 4 <= chars.len() && chars[i + 1] == '!' {
                        match chars[i + 3..].iter().position(|x| *x == ']') {
                            None => (),
                            Some(j) => {
                                let chars = &chars[i + 2..i + 3 + j];
                                let cs = parse_char_specifiers(chars);
                                tokens.push(AnyExcept(cs));
                                i += j + 4;
                                continue;
                            }
                        }
                    } else if i + 3 <= chars.len() && chars[i + 1] != '!' {
                        match chars[i + 2..].iter().position(|x| *x == ']') {
                            None => (),
                            Some(j) => {
                                let cs = parse_char_specifiers(&chars[i + 1..i + 2 + j]);
                                tokens.push(AnyWithin(cs));
                                i += j + 3;
                                continue;
                            }
                        }
                    }
                    // if we get here then this is not a valid range pattern
                    return Err(PatternError {
                        pos: i,
                        msg: ERROR_INVALID_RANGE,
                    });
                }
                c => {
                    tokens.push(Char(c));
                    i += 1;
                }
            }
        }
        Ok(Self {
            tokens,
            original: pattern.to_string(),
            is_recursive,
        })
    }
pub fn new ( pattern : & str ) -> Result < Self , PatternError > { let chars = pattern . chars ( ) . collect :: < Vec < _ > > ( ) ; let mut tokens = Vec :: new ( ) ; let mut is_recursive = false ; let mut i = 0 ; while i < chars . len ( ) { match chars [ i ] { '?' => { tokens . push ( AnyChar ) ; i += 1 ; } '*' => { let old = i ; while i < chars . len ( ) && chars [ i ] == '*' { i += 1 ; } let count = i - old ; if count > 2 { return Err ( PatternError { pos : old + 2 , msg : ERROR_WILDCARDS , } ) ; } else if count == 2 { // ** can only be an entire path component // i.e. a/**/b is valid, but a**/b or a/**b is not // invalid matches are treated literally let is_valid = if i == 2 || path :: is_separator ( chars [ i - count - 1 ] ) { // it ends in a '/' if i < chars . len ( ) && path :: is_separator ( chars [ i ] ) { i += 1 ; true // or the pattern ends here // this enables the existing globbing mechanism } else if i == chars . len ( ) { true // `**` ends in non-separator } else { return Err ( PatternError { pos : i , msg : ERROR_RECURSIVE_WILDCARDS , } ) ; } // `**` begins with non-separator } else { return Err ( PatternError { pos : old - 1 , msg : ERROR_RECURSIVE_WILDCARDS , } ) ; } ; if is_valid { // collapse consecutive AnyRecursiveSequence to a // single one let tokens_len = tokens . len ( ) ; if ! ( tokens_len > 1 && tokens [ tokens_len - 1 ] == AnyRecursiveSequence ) { is_recursive = true ; tokens . push ( AnyRecursiveSequence ) ; } } } else { tokens . push ( AnySequence ) ; } } '[' => { if i + 4 <= chars . len ( ) && chars [ i + 1 ] == '!' { match chars [ i + 3 .. ] . iter ( ) . position ( | x | * x == ']' ) { None => ( ) , Some ( j ) => { let chars = & chars [ i + 2 .. i + 3 + j ] ; let cs = parse_char_specifiers ( chars ) ; tokens . push ( AnyExcept ( cs ) ) ; i += j + 4 ; continue ; } } } else if i + 3 <= chars . len ( ) && chars [ i + 1 ] != '!' { match chars [ i + 2 .. ] . iter ( ) . position ( | x | * x == ']' ) { None => ( ) , Some ( j ) => { let cs = parse_char_specifiers ( & chars [ i + 1 .. i + 2 + j ] ) ; tokens . push ( AnyWithin ( cs ) ) ; i += j + 3 ; continue ; } } } // if we get here then this is not a valid range pattern return Err ( PatternError { pos : i , msg : ERROR_INVALID_RANGE , } ) ; } c => { tokens . push ( Char ( c ) ) ; i += 1 ; } } } Ok ( Self { tokens , original : pattern . to_string ( ) , is_recursive , } ) }
This function compiles Unix shell style patterns.
This function compiles Unix shell style patterns .
pattern
&str
pattern
&str