string-utils (historical revision 45181)

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(import memoized-string)

make-string+

[procedure] (make-string+ COUNT [FILL]) -> string

An interning make-string.

FILL is any valid char, including codepoints outside of the ASCII range, which produce UTF-8 strings.

string+

[procedure] (string+ [CHAR...]) -> string

An interning string.

CHAR is any valid char, including codepoints outside of the ASCII range, which produce UTF-8 strings.

global-string

[procedure] (global-string STR) -> string

Share common string space.

String Hexadecimal

Usage

(import string-hexadecimal)

string->hex

[procedure] (string->hex STRING [START [END]]) -> string

Returns a hexadecimal string (Latin1) from STRING (Latin1). START and END are substring limits.

STRING is treated as a string of bytes.

hex->string

[procedure] (hex->string STRING [START [END]]) -> string

Returns the string (Latin1) from a hexadecimal STRING (Latin1). START and END are substring limits.

utf8->hex

[procedure] (utf8->hex STRING [START [END]]) -> string

Returns a hexadecimal string (Latin1) from STRING (Utf8). START and END are substring limits.

STRING is treated as a string of bytes.

hex->utf8

[procedure] (hex->string STRING [START [END]]) -> string

Returns the string (Utf8) from a hexadecimal STRING (Latin1). START and END are substring limits.

String Utilities

Usage

(import string-utils)

string-split-chars

[procedure] (string-split-chars STR [DELIMITERS]) -> (list-of string) (list-of char)

Returns a list of substrings of STR & a list of the characters, from DELIMITERS, separating those substrings.

STR: string ; version string.
DELIMITERS: string ; string of version component delimiter characters, default ".,".

(string-split-chars "a.2,c" "$,.")
;=> ("a" "2" "c") (#\. #\,)

string-unzip

[procedure] (string-unzip STR [DELIMITERS]) -> (list-of string) (list-of string)

Returns a list of substrings of STR & a list of the delimiters, from DELIMITERS, separating those substrings.

STR: string ; version string.
DELIMITERS: string ; string of version component delimiter characters, default ".,".

(string-unzip "a.2,c" "$,.")
;=> ("a" "2" "c") ("." ",")

string-zip

[procedure] (string-zip PARTS PUNCS) -> string

Returns a string formed from the concatenation of the PARTS and the interspersion of the PUNCS.

PARTS: (list-of string) ; version components.
PUNCS: (list-of string) ; version component separators.

(string-zip ("a" "2" "c") ("." ","))
;=> "a.2,c"

string-trim-whitespace-both

[procedure] (string-trim-whitespace-both S) -> string

Returns the string S with whitespace trimmed.

list-as-string

[procedure] (list-as-string LS) -> string

Returns the list LS written to a string.

number->padded-string

[procedure] (number->padded-string N WIDTH [PADCHAR [BASE]]) -> string

N: number ; source
WIDTH: fixnum ; field width
PADCHAR: char ; padding character
BASE: fixnum ; number conversion base

string-fixed-length

[procedure] (string-fixed-length S N [pad-char: #\space] [trailing: "..."]) -> string

Returns the string S with the string-length fixed to N.

A shorter string is padded. A longer string is truncated, & suffixed with the trailing.

string-subsequence?

[procedure] (string-subsequence? S T) -> boolean

Returns whether the characters of S occur in order thru T.

string-longest-common-prefix

[procedure] (string-longest-common-prefix STRINGS) -> string

Returns the longest comment prefix of STRINGS.

STRINGS: (list-of string)

string-longest-common-suffix

[procedure] (string-longest-common-suffix STRINGS) -> string

Returns the longest comment suffix of STRINGS.

STRINGS: (list-of string)

string-longest-prefix

[procedure] (string-longest-prefix CANDIDATE OTHERS) -> (or boolean string)

Returns the member with the longest comment prefix of CANDIDATE from OTHERS, or #f.

CANDIDATE: string
OTHERS: (list-of string)

string-longest-suffix

[procedure] (string-longest-suffix CANDIDATE OTHERS) -> (or boolean string)

Returns the member with the longest comment suffix of CANDIDATE from OTHERS, or #f.

CANDIDATE: string
OTHERS: (list-of string)

String Interpolation

Extends the read-syntax with #"..." where tagged scheme expressions in the string are evaluated at runtime:

#"@ #(+ 1 2)## (#'and #1 #2) = #(and 1 2) trailing #"
;=> "@ 3# (and 1 2) = 2 trailing #"

Similar to the #<# multi-line string.

See Multiline String Constant with Embedded Expressions.

Note Support for the #{<sexpr>} subform is dropped. So SRFI 105 can work as expected:

(import (srfi-105 extra))
#"1 + 3 = #{1 + 3}"
;=> "1 + 3 = 4"
#"An \"#{string-append(\"Hello, \" \"World\")}\" example"
;=> "An \"Hello, World\" example"

Usage

(import string-interpolation)

Compiler Command-Line

csc -extend string-interpolation ...

Interpreter Command-Line

csi -require-extension string-interpolation ...

Activates string-interpolation #"..." syntax.

String Interpolation Syntax

Usage

(import string-interpolation-syntax)

set-sharp-string-interpolation-syntax

[procedure] (set-sharp-string-interpolation-syntax PROC)

Extends the read-syntax with #"..." where the "..." is evaluated using (PROC "...").

PROC: #f ; read-syntax is cleared.
PROC: #t ; PROC is identity.
PROC: procedure ; interpolation function.

String Interpolator

Usage

(import string-interpolator)

string-interpolate

[procedure] (string-interpolate STR [eval-tag: EVAL-TAG]) -> list

Performs substitution of embedded Scheme expressions, prefixed with EVAL-TAG. Two consecutive EVAL-TAGs are translated to a single EVAL-TAG. A trailing EVAL-TAG is taken literally.

STR: string.
EVAL-TAG: character, default #\#.

Rabin Karp String Search

Usage

(import rabin-karp)

make-string-search

[procedure] (make-string-search STRINGS [COMPARE [HASH]]) -> SEARCHER

STRINGS: (list-of string) ;
COMPARE: (string string --> boolean) ;
HASH: (string [BOUNDS []]) ; SRFI-69 hash procedure.
SEARCHER: (string [START [END]]) --> RESULT
RESULT: (or #f (STRING . (START . END))) ; success or failure result

collect-string-search

[procedure] (collect-string-search SEARCHER TARGET) -> (list-of RESULT)

Perform exhaustive search of the TARGET, returing a list of RESULT.

SEARCHER: from make-string-search
TARGET: string ; search within
RESULT: (or #f (STRING . (START . END))) ; success or failure result

Hexadecimal Procedures

Usage

(import to-hex)

OUT is a bytevector of length >= (+ LEN 2).

OFF is the byte offset.

LEN is the length of the bytes at OFF.

str_to_hex

[procedure] (str_to_hex OUT IN OFF LEN) -> string

Writes the hexadecimal string (Latin1) of IN to OUT.

IN is a nonnull-string (Latin1).

utf8_to_hex

[procedure] (utf8_to_hex OUT IN OFF LEN) -> string

IN is a nonnull-string (Utf8).

bv_to_hex

[procedure] (bv_to_hex OUT IN OFF LEN) -> string

IN is a nonnull-blob.

u8vec_to_hex

[procedure] (u8vec_to_hex OUT IN OFF LEN) -> string

IN is a nonnull-u8vector.

s8vec_to_hex

[procedure] (s8vec_to_hex OUT IN OFF LEN) -> string

IN is a nonnull-s8vector.

mem_to_hex

[procedure] (mem_to_hex OUT IN OFF LEN) -> string

IN is a nonnull-c-pointer.

hex_to_str

[procedure] (hex_to_str OUT IN OFF LEN) -> string

Parses the hexadecimal string (Latin1) of IN as a string (Latin1).

hex_to_utf8

[procedure] (hex_to_utf8 OUT IN OFF LEN) -> string

Parses the hexadecimal string (Latin1) of IN as a string (Utf8).

hex_to_bv

[procedure] (hex_to_bv OUT IN OFF LEN) -> bytevector

Parses the hexadecimal string (Latin1) of IN as a bytevector.

Requirements

srfi-1 srfi-13 srfi-14 srfi-69 check-errors miscmacros

test test-utils

License

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

 Redistributions of source code must retain the above copyright notice, this list of conditions and the following
   disclaimer.
 Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
   disclaimer in the documentation and/or other materials provided with the distribution.
 Neither the name of the author nor the names of its contributors may be used to endorse or promote
   products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICESLOSS OF USE, DATA, OR PROFITSOR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

string-utils

Documentation

Memoized String

Usage

make-string+

string+

global-string

String Hexadecimal

Usage

string->hex

hex->string

utf8->hex

hex->utf8

String Utilities

Usage

string-split-chars

string-unzip

string-zip

string-trim-whitespace-both

list-as-string

number->padded-string

string-fixed-length

string-subsequence?

string-longest-common-prefix

string-longest-common-suffix

string-longest-prefix

string-longest-suffix

String Interpolation

Usage

Compiler Command-Line

Interpreter Command-Line

String Interpolation Syntax

Usage

set-sharp-string-interpolation-syntax

String Interpolator

Usage

string-interpolate

Rabin Karp String Search

Usage

make-string-search

collect-string-search

Hexadecimal Procedures

Usage

str_to_hex

utf8_to_hex

bv_to_hex

u8vec_to_hex

s8vec_to_hex

mem_to_hex

hex_to_str

hex_to_utf8

hex_to_bv

Requirements

Author

Version history

License