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Article contents:[[tags: egg]] == string-utils [[toc:]] == Documentation === Memoized String ==== Usage <enscript language=scheme> (import memoized-string) </enscript> ==== make-string+ <procedure>(make-string+ COUNT [FILL]) -> string</procedure> 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</procedure> 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</procedure> Share common string space. === String Hexadecimal ==== Usage <enscript language=scheme> (import string-hexadecimal) </enscript> ==== string->hex <procedure>(string->hex STRING [START [END]]) -> string</procedure> Returns a hexadecimal represenation of {{STRING}}. {{START}} and {{END}} are substring limits. {{STRING}} is treated as a string of bytes, a byte-vector. ==== hex->string <procedure>(hex->string STRING [START [END]]) -> string</procedure> Returns the binary representation of a hexadecimal{{STRING}}. {{START}} and {{END}} are substring limits. === Hexadecimal Procedures ==== Usage <enscript language=scheme> (import to-hex) </enscript> ==== str_to_hex <procedure>(str_to_hex OUT IN OFF LEN)</procedure> Writes the ASCII hexadecimal representation of {{IN}} to {{OUT}}. {{IN}} is a {{nonnull-string}}. {{OFF}} is the byte offset. {{LEN}} is the length of the bytes at {{OFF}}. {{OUT}} is a {{string}} of length >= {{(+ LEN 2)}}. ==== blob_to_hex <procedure>(blob_to_hex OUT IN OFF LEN)</procedure> Like {{str_to_hex}} except {{IN}} is a {{nonnull-blob}}. ==== u8vec_to_hex <procedure>(u8vec_to_hex OUT IN OFF LEN)</procedure> Like {{str_to_hex}} except {{IN}} is a {{nonnull-u8vector}}. ==== s8vec_to_hex <procedure>(s8vec_to_hex OUT IN OFF LEN)</procedure> Like {{str_to_hex}} except {{IN}} is a {{nonnull-s8vector}}. ==== mem_to_hex <procedure>(mem_to_hex OUT IN OFF LEN)</procedure> Like {{str_to_hex}} except {{IN}} is a {{nonnull-c-pointer}}. ==== hex_to_str <procedure>(hex_to_str OUT IN OFF LEN)</procedure> Reads the ASCII hexadecimal representation of {{IN}} to {{OUT}}. {{IN}} is a {{nonnull-string}}. {{OFF}} is the byte offset. {{LEN}} is the length of the bytes at {{OFF}}. {{OUT}} is a {{string}} of length >= {{(/ LEN 2)}}. ==== hex_to_blob <procedure>(hex_to_blob OUT IN OFF LEN)</procedure> Like {{hex_to_str}} except {{OUT}} is a {{blob}} of size >= {{(/ LEN 2)}}. === Unicode Utilities The name of this extension is misleading. Only UTF-8 is currently supported. For a better treatment of UTF-8 see the [[utf-8]] extension. ==== Usage <enscript language=scheme> (import unicode-utils) </enscript> ==== ascii-codepoint? <procedure>(ascii-codepoint? CHAR) -> boolean</procedure> ==== char->unicode-string <procedure>(char->unicode-string CHAR) -> string</procedure> Returns a string formed from Unicode codepoint {{CHAR}}. ''Note'' that the {{(string-length)}} (except under [[utf-8]]) may not be equal to {{1}}. Generates an error should the codepoint be out-of-range. ==== unicode-string <procedure>(unicode-string [CHAR...]) -> string</procedure> Returns a string formed from Unicode codepoints {{CHAR...}} ''Note'' that the {{(string-length)}} (except under [[utf-8]]) may not be equal to the length of {{CHAR...}}. Generates an error should the codepoint be out-of-range. ==== *unicode-string <procedure>(*unicode-string CHARS) -> string</procedure> Returns a string formed from Unicode codepoints {{CHARS}}, a {{(list-of char)}}. ==== unicode-make-string <procedure>(unicode-make-string COUNT [FILL]) -> string</procedure> Returns a string formed from {{COUNT}} occurrences of the Unicode codepoint {{FILL}}. The {{FILL}} default is {{#\space}}. ''Note'' that the {{(string-length)}} (except under [[utf-8]]) may not be equal to {{COUNT}}. Generates an error should the codepoint be out-of-range. ==== unicode-surrogate? <procedure>(unicode-surrogate? NUM) -> boolean</procedure> ==== unicode-surrogates->codepoint <procedure>(unicode-surrogates->codepoint HIGH LOW) -> (or boolean fixnum)</procedure> Returns the codepoint for the valid surrogate pair {{HIGH}} and {{LOW}}. Otherwise returns {{#f}}. === String Utilities ==== Usage <enscript language=scheme> (import string-utils) </enscript> ==== string-split-chars <procedure>(string-split-chars STR [DELIMITERS]) -> (list-of string) (list-of char)</procedure> 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 {{".,"}}. <enscript language=scheme> (string-split-chars "a.2,c" "$,.") ;=> ("a" "2" "c") (#\. #\,) </enscript> ==== string-unzip <procedure>(string-unzip STR [DELIMITERS]) -> (list-of string) (list-of string)</procedure> Returns a {{list}} of substrings of STR & a {{list}} of the delimiters, from DELIMITERS, separating those substrings. ; STR : {{string}} ; version string. ; DELIMITERS : {{string}} ; string of version component delimiter characters, default {{".,"}}. <enscript language=scheme> (string-unzip "a.2,c" "$,.") ;=> ("a" "2" "c") ("." ",") </enscript> ==== string-zip <procedure>(string-zip PARTS PUNCS) -> string</procedure> 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. <enscript language=scheme> (string-zip ("a" "2" "c") ("." ",")) ;=> "a.2,c" </enscript> ==== string-trim-whitespace-both <procedure>(string-trim-whitespace-both S) -> string</procedure> Returns the {{string}} {{S}} with whitespace trimmed. ==== list-as-string <procedure>(list-as-string LS) -> string</procedure> Returns the {{list}} {{LS}} written to a {{string}}. ==== number->padded-string <procedure>(number->padded-string N WIDTH [PADCHAR [BASE]]) -> string</procedure> ; 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</procedure> 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-longest-common-prefix <procedure>(string-longest-common-prefix STRINGS) -> string</procedure> Returns the longest comment prefix of {{STRINGS}}. ; STRINGS : {{(list-of string)}} ==== string-longest-common-suffix <procedure>(string-longest-common-suffix STRINGS) -> string</procedure> Returns the longest comment suffix of {{STRINGS}}. ; STRINGS : {{(list-of string)}} ==== string-longest-prefix <procedure>(string-longest-prefix CANDIDATE OTHERS) -> (or boolean string)</procedure> 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)</procedure> 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: <enscript> #"@ #(+ 1 2)## (#'and #1 #2) = #(and 1 2) trailing #" ;=> "@ 3# (and 1 2) = 2 trailing #" </enscript> Similar to the {{#<#}} multi-line string. See [[http://wiki.call-cc.org/man/5/Extensions%20to%20the%20standard#multiline-string-constant-with-embedded-expressions|Multiline String Constant with Embedded Expressions]]. '''Note''' Support for the #{<sexpr>} subform is dropped. So {{SRFI 105}} can work as expected: <enscript> (import (srfi-105 extra)) #"1 + 3 = #{1 + 3}" ;=> "1 + 3 = 4" #"An \"#{string-append(\"Hello, \" \"World\")}\" example" ;=> "An \"Hello, World\" example" </enscript> ==== Usage <enscript language=scheme> (import string-interpolation) </enscript> or using UTF8 <enscript language=scheme> (import utf8-string-interpolation) </enscript> ==== Compiler Command-Line <enscript> csc -extend [utf8-]string-interpolation ... </enscript> ==== Interpreter Command-Line <enscript> csi -require-extension [utf8-]string-interpolation ... </enscript> Activates string-interpolation {{#"..."}} syntax. === String Interpolation Syntax ==== Usage <enscript language=scheme> (import string-interpolation-syntax) </enscript> ==== set-sharp-string-interpolation-syntax <procedure>(set-sharp-string-interpolation-syntax PROC)</procedure> 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 <enscript language=scheme> (import string-interpolator) </enscript> or using UTF8 <enscript language=scheme> (import utf8-string-interpolator) </enscript> ==== string-interpolate <procedure>(string-interpolate STR [eval-tag: EVAL-TAG]) -> list</procedure> Performs substitution of embedded Scheme expressions, prefixed with {{EVAL-TAG}}. Two consecutive {{EVAL-TAG}}s 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 <enscript language=scheme> (import rabin-karp) </enscript> ==== make-string-search <procedure>(make-string-search STRINGS [COMPARE [HASH]]) -> SEARCHER</procedure> ; {{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)</procedure> 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 == Requirements [[check-errors]] [[miscmacros]] [[srfi-1]] [[srfi-13]] [[srfi-69]] [[utf8]] [[test]] [[test-utils]] == Author [[/users/kon-lovett|Kon Lovett]] == Version history ; 2.7.4 : More fixnum, add default delimiter for {{string-split-chars}}/{{string-unzip}}. ; 2.7.3 : Add tests, more fixnum, fix signatures. ; 2.7.2 : Fix signatures, new test-runner. ; 2.7.1 : Fix version. ; 2.7.0 : Add {{rabin-karp}} module. ; 2.6.0 : Remove #{...} support. ; 2.5.6 : Reflow. ; 2.5.5 : Update test-runner. ; 2.5.4 : UTF8. ; 2.5.3 : Add {{string-split-chars}}. ; 2.5.2 : Fix potential buffer overflow in {{to-hex}}. ; 2.5.0 : Add {{string-zip}} & {{string-unzip}}. ; 2.4.0 : Add {{string-longest-common-prefix/suffix}}, {{string-longest-prefix/suffix}}, {{number->padded-string}}, {{list-as-string}}, {{string-trim-whitespace-both}}. ; 2.3.2 : Deprecate {{unicode-char->string}}, fixes for {{memoized-string}} & {{string-utils}} modules, {{ascii-codepoint?}} & {{unicode-surrogate?}} are not predicates. ; 2.3.1 : Minor optimization. ; 2.3.0 : Deprecate #{...} support. Add {{string-interpolator}} modules. ; 2.2.0 : Fix {{string-interpolation}}. ; 2.1.0 : Add {{utf8-string-interpolation}}. ; 2.0.0 : C5 release. == License Copyright (C) 2010-2024 Kon Lovett. All rights reserved. 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. 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