Step by Step solution about How to resolve the algorithm Camel case and snake case step by step in the Julia programming language

The provided Julia code defines a set of functions for converting variable names between different formats, such as snake case and camel case. These functions use regular expressions to identify and modify specific characters in the input strings.

Snake Case to Camel Case Conversion

function snakeToCamelCase(s; sep=r"[_]+", lcmiddle=false)
   isempty(s) && return s
   words = split(strip(s), sep)
   return lowercasefirst(join(uppercasefirst.(lcmiddle ? lowercase.(words) : words)))
end

• snakeToCamelCase converts snake case (underscores as word separators) to camel case (capitalized words).
• sep specifies the separator to be converted, which defaults to underscores (_).
• lcmiddle (short for "lowercase middle") determines whether the middle characters of words in the camel case should be lowercase (if true) or capitalized (if false).

Other Case Conversion Functions

Several other functions are defined based on snakeToCamelCase:

• spaceToCamelCase: Converts space-separated words to camel case.
• kebabToCamelCase: Converts kebab case (hyphens as word separators) to camel case.
• periodToCamelCase: Converts period-separated words to camel case.
• allsepToCamelCase: Converts all common separators (spaces, hyphens, underscores, and periods) to camel case.
• lowermiddle_allsepToCamelCase: Similar to allsepToCamelCase, but also lowercases the middle characters of words.

Camel Case to Snake Case Conversion

function camel_to_snake_case(s; sep="_", insep=sep, allsep=r"_+", lcmiddle=true)
   s = isempty(s) ? (return s) : lowercasefirst(strip(s))
   s = replace(s, r"[A-Z]+" => x -> sep * (lcmiddle ? lowercase(x) : lowercasefirst(x)))
   return replace(s, allsep => sep)
end

• camel_to_snake_case converts camel case to snake case (underscores as word separators).
• sep specifies the separator to be used for snake case.
• insep specifies the input separator (used for special cases).
• allsep specifies the set of all separators that should be converted to sep.
• lcmiddle determines whether the middle characters of words in the snake case should be lowercase (if true) or capitalized (if false).

Other Case Conversion Functions

Several other functions are defined based on camel_to_snake_case:

• preserve_midcaps_camel_to_snake_case: Similar to camel_to_snake_case, but preserves any existing capital letters in the middle of words.
• allsep_to_snake_case: Converts all common separators (spaces, hyphens, underscores, and periods) to snake case.
• allsep_to_kebab_case: Similar to allsep_to_snake_case, but uses hyphens as the separator.
• allsep_to_space_case: Similar to allsep_to_snake_case, but uses spaces as the separator.
• allsep_to_period_case: Similar to allsep_to_snake_case, but uses periods as the separator.
• allsep_to_slash_case: Similar to allsep_to_snake_case, but uses slashes as the separator.

Usage

The code also includes a loop that calls each of the defined functions with a list of test strings and prints the resulting converted strings. This demonstrates the functionality and usage of all the case conversion functions.

#=
Regex based variable name convention change string functions.
    `sep` is the separator targeted for change from (to camel case) or to (to snake case)
    `allsep` is the separators other than `sep` that may be changed to `sep`
    `lcmiddle` is a boolean to set whether caps within camel case words are made lowercase
=#

function snakeToCamelCase(s; sep=r"[_]+", lcmiddle=false)
    isempty(s) && return s
    words = split(strip(s), sep)
    return lowercasefirst(join(uppercasefirst.(lcmiddle ? lowercase.(words) : words)))
end

spaceToCamelCase(s) = snakeToCamelCase(s; sep=r"\s+")
kebabToCamelCase(s) = snakeToCamelCase(s; sep=r"[\-]+")
periodToCamelCase(s) = snakeToCamelCase(s; sep=r"[\.]+")
allsepToCamelCase(s) = snakeToCamelCase(s; sep=r"[ \-_\.]+")
lowermiddle_allsepToCamelCase(s) = snakeToCamelCase(s; sep=r"[ \-_\.]+", lcmiddle=true)

function camel_to_snake_case(s; sep="_", insep=sep, allsep=r"_+", lcmiddle=true)
    s = isempty(s) ? (return s) : lowercasefirst(strip(s))
    s = replace(s, r"[A-Z]+" => x -> sep * (lcmiddle ? lowercase(x) : lowercasefirst(x)))
    return replace(s, allsep => sep)
end

preserve_midcaps_camel_to_snake_case(s) = camel_to_snake_case(s; lcmiddle=false)
allsep_to_snake_case(s) = camel_to_snake_case(s; allsep=r"[ \-\._]+")
allsep_to_kebab_case(s) = camel_to_snake_case(s; allsep=r"[ \-\._]+", sep="-")
allsep_to_space_case(s) = camel_to_snake_case(s; allsep=r"[ \-\._]+", sep=" ")
allsep_to_period_case(s) = camel_to_snake_case(s; allsep=r"[ \-\._]+", sep=".")
allsep_to_slash_case(s) = camel_to_snake_case(s; allsep=r"[ \-\._]+", sep="/")

for f in [
    snakeToCamelCase,
    spaceToCamelCase,
    kebabToCamelCase,
    periodToCamelCase,
    allsepToCamelCase,
    lowermiddle_allsepToCamelCase,
    camel_to_snake_case,
    preserve_midcaps_camel_to_snake_case,
    allsep_to_snake_case,
    allsep_to_kebab_case,
    allsep_to_space_case,
    allsep_to_period_case,
    allsep_to_slash_case,
]
    println("Testing function $f:")

    for teststring in [
        "snakeCase",
        "snake_case",
        "snake-case",
        "snake case",
        "snake CASE",
        "snake.case",
        "variable_10_case",
        "variable10Case",
        "ɛrgo rE tHis",
        "hurry-up-joe!",
        "c://my-docs/happy_Flag-Day/12.doc",
        " spaces ",
    ]
        println(lpad(teststring, 36), "  =>  ", f(teststring))
    end
    println()
end