Camel case and snake case: Difference between revisions
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c://my-docs/happy_Flag-Day/12.doc => camel: c://my-docs/happyFlag-Day/12.doc snake: c://my-docs/happy__flag-_day/12.doc
spaces => camel: spaces snake: spaces</pre>
=={{header|C++}}==
The output of this example reflects the author's interpretation of the task.
<syntaxhighlight lang="c++">
#include <algorithm>
#include <iomanip>
#include <iostream>
#include <string>
#include <vector>
const char HYPHEN = '-';
const char SPACE = ' ';
const char UNDERSCORE = '_';
const std::string WHITESPACE = " \n\r\t\f\v";
std::string left_trim(const std::string& text) {
size_t start = text.find_first_not_of(WHITESPACE);
return ( start == std::string::npos ) ? "" : text.substr(start);
}
std::string right_trim(const std::string& text) {
size_t end = text.find_last_not_of(WHITESPACE);
return ( end == std::string::npos ) ? "" : text.substr(0, end + 1);
}
std::string trim(const std::string& text) {
return left_trim(right_trim(text));
}
std::string to_snake_case(std::string& camel) {
camel = trim(camel);
std::replace(camel.begin(), camel.end(), SPACE, UNDERSCORE);
std::replace(camel.begin(), camel.end(), HYPHEN, UNDERSCORE);
std::string snake = "";
bool first = true;
for ( const char& ch : camel ) {
if ( first ) {
snake += ch;
first = false;
} else if ( ! first && ch >= 'A' && ch <= 'Z' ) {
if ( snake[snake.length() - 1] == UNDERSCORE ) {
snake += tolower(ch);
} else {
snake += UNDERSCORE;
snake += tolower(ch);
}
} else {
snake += ch;
}
}
return snake;
}
std::string to_camel_case(std::string& snake) {
snake = trim(snake);
std::replace(snake.begin(), snake.end(), SPACE, UNDERSCORE);
std::replace(snake.begin(), snake.end(), HYPHEN, UNDERSCORE);
std::string camel = "";
bool underscore = false;
for ( const char& ch : snake ) {
if ( ch == UNDERSCORE ) {
underscore = true;
} else if ( underscore ) {
camel += toupper(ch);
underscore = false;
} else {
camel += ch;
}
}
return camel;
}
int main() {
const std::vector<std::string> variable_names = { "snakeCase", "snake_case", "variable_10_case", "variable10Case",
"ergo rE tHis", "hurry-up-joe!", "c://my-docs/happy_Flag-Day/12.doc", " spaces " };
std::cout << std::setw(48) << "=== To snake_case ===" << std::endl;
for ( std::string text : variable_names ) {
std::cout << std::setw(34) << text << " --> " << to_snake_case(text) << std::endl;
}
std::cout << std::endl;
std::cout << std::setw(48) << "=== To camelCase ===" << std::endl;
for ( std::string text : variable_names ) {
std::cout << std::setw(34) << text << " --> " << to_camel_case(text) << std::endl;
}
}
</syntaxhighlight>
{{ out }}
<pre>
=== To snake_case ===
snakeCase --> snake_case
snake_case --> snake_case
variable_10_case --> variable_10_case
variable10Case --> variable10_case
ergo rE tHis --> ergo_r_e_t_his
hurry-up-joe! --> hurry_up_joe!
c://my-docs/happy_Flag-Day/12.doc --> c://my_docs/happy_flag_day/12.doc
spaces --> spaces
=== To camelCase ===
snakeCase --> snakeCase
snake_case --> snakeCase
variable_10_case --> variable10Case
variable10Case --> variable10Case
ergo rE tHis --> ergoRETHis
hurry-up-joe! --> hurryUpJoe!
c://my-docs/happy_Flag-Day/12.doc --> c://myDocs/happyFlagDay/12.doc
spaces --> spaces
</pre>
=={{header|Delphi}}==
{{works with|Delphi|6.0}}
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