forked from Mirrors/openclonk
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/**
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String.c
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Functions for string manipulation.
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@authors Maikel
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*/
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// Returns the reduced string with only the characters in the interval [begin, end) are taken. The value begin starts
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// at zero and end can be at most the length of the string, which then includes the last character.
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global func TakeString(string str, int begin, int end)
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{
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// Default values and safety.
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begin = begin ?? 0;
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begin = Max(begin, 0);
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end = end ?? GetLength(str);
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end = Min(end, GetLength(str));
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// Construct the reduced string by looping over all chars.
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var reduced_str = "";
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for (var index = begin; index < end; index++)
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reduced_str = Format("%s%c", reduced_str, GetChar(str, index));
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return reduced_str;
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}
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// Converts a char into a string.
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global func CharToString(int char)
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{
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return Format("%c", char);
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}
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// Returns whether a char is a digit [0-9].
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global func CharIsDigit(int char)
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{
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return Inside(char, 48, 57);
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}
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// Returns whether a char is a letter [A-Za-z].
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global func CharIsLetter(int char)
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{
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return CharIsLowerCase(char) || CharIsUpperCase(char);
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}
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// Returns whether a char is a lower-case letter [a-z].
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global func CharIsLowerCase(int char)
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{
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return Inside(char, 97, 122);
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}
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// Returns whether a char is an upper-case letter [A-Z].
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global func CharIsUpperCase(int char)
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{
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return Inside(char, 65, 90);
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}
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// Converts a string to an integer if it consists of digits only.
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global func StringToInteger(string str)
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{
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var integer = 0;
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var power = 0;
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for (var index = GetLength(str) - 1; index >= 0; index--)
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{
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var char = GetChar(str, index);
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if (!CharIsDigit(char))
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return nil;
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integer += (char - 48) * 10**power;
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power++;
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}
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return integer;
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}
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