140 lines
3.3 KiB
C++
140 lines
3.3 KiB
C++
#include "ksbit.h"
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#include <limits.h>
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namespace StringMethods {
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/**
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* Returns the character at the specified index.
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* @param pos The zero-based index of the desired character.
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*/
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//%
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StringData *charAt(StringData *s, int pos) {
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return ManagedString((char)ManagedString(s).charAt(pos)).leakData();
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}
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/**
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* Returns the Unicode value of the character at the specified location.
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* @param index The zero-based index of the desired character. If there is no character at the specified index, NaN is returned.
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*/
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//%
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int charCodeAt(StringData *s, int index) {
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return ManagedString(s).charAt(index);
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}
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/**
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* Returns a string that contains the concatenation of two or more strings.
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* @param other The string to append to the end of the string.
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*/
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//%
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StringData *concat(StringData *s, StringData *other) {
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ManagedString a(s), b(other);
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return (a + b).leakData();
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}
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/**
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* Determines whether relative order of two strings (in ASCII encoding).
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* @param that String to compare to target string
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*/
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//%
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int compare(StringData *s, StringData *that) {
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return strcmp(s->data, that->data);
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}
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/** Returns the length of a String object. */
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//% property
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int length(StringData *s) {
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return s->len;
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}
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}
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namespace BooleanMethods {
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// Cache the string literals "true" and "false" when used.
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// Note that the representation of booleans stays the usual C-one.
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static const char sTrue[] __attribute__ ((aligned (4))) = "\xff\xff\x04\x00" "true\0";
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static const char sFalse[] __attribute__ ((aligned (4))) = "\xff\xff\x05\x00" "false\0";
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/**
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* Returns a string representation of an object.
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*/
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//%
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StringData* toString(bool v)
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{
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if (v) {
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return (StringData*)(void*)sTrue;
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} else {
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return (StringData*)(void*)sFalse;
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}
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}
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}
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namespace String {
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/**
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* Make a string from the given ASCII character code.
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*/
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//%
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StringData *fromCharCode(int code)
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{
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return ManagedString((char)code).leakData();
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}
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}
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namespace NumberMethods {
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/**
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* Returns a string representation of a number.
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*/
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//%
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StringData* toString(int n)
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{
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return ManagedString(n).leakData();
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}
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}
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namespace Math {
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/**
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* Returns the value of a base expression taken to a specified power.
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* @param x The base value of the expression.
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* @param y The exponent value of the expression.
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*/
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//%
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int pow(int x, int y)
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{
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if (y < 0)
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return 0;
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int r = 1;
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while (y) {
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if (y & 1)
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r *= x;
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y >>= 1;
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x *= x;
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}
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return r;
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}
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/**
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* Returns a pseudorandom number between 0 and `max`.
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*/
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//%
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int random(int max) {
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if (max == INT_MIN)
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return -uBit.random(INT_MAX);
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else if (max < 0)
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return -uBit.random(-max);
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else if (max == 0)
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return 0;
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else
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return uBit.random(max);
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}
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/**
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* Returns the square root of a number.
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* @param x A numeric expression.
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*/
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//%
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int sqrt(int x)
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{
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return ::sqrt(x);
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}
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}
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