+/*
+Module: int
+*/
+/*
+Function: max_value
-fn add(int x, int y) -> int { ret x + y; }
+The maximum value of an integer
+*/
+fn max_value() -> int {
+ ret min_value() - 1;
+}
+
+/*
+Function: min_value
+
+The minumum value of an integer
+*/
+fn min_value() -> int {
+ ret (-1 << (sys::size_of::<int>() * 8u as int - 1)) as int;
+}
-fn sub(int x, int y) -> int { ret x - y; }
+/* Function: add */
+pure fn add(x: int, y: int) -> int { ret x + y; }
-fn mul(int x, int y) -> int { ret x * y; }
+/* Function: sub */
+pure fn sub(x: int, y: int) -> int { ret x - y; }
-fn div(int x, int y) -> int { ret x / y; }
+/* Function: mul */
+pure fn mul(x: int, y: int) -> int { ret x * y; }
-fn rem(int x, int y) -> int { ret x % y; }
+/* Function: div */
+pure fn div(x: int, y: int) -> int { ret x / y; }
-fn lt(int x, int y) -> bool { ret x < y; }
+/* Function: rem */
+pure fn rem(x: int, y: int) -> int { ret x % y; }
-fn le(int x, int y) -> bool { ret x <= y; }
+/* Predicate: lt */
+pure fn lt(x: int, y: int) -> bool { ret x < y; }
-fn eq(int x, int y) -> bool { ret x == y; }
+/* Predicate: le */
+pure fn le(x: int, y: int) -> bool { ret x <= y; }
-fn ne(int x, int y) -> bool { ret x != y; }
+/* Predicate: eq */
+pure fn eq(x: int, y: int) -> bool { ret x == y; }
-fn ge(int x, int y) -> bool { ret x >= y; }
+/* Predicate: ne */
+pure fn ne(x: int, y: int) -> bool { ret x != y; }
-fn gt(int x, int y) -> bool { ret x > y; }
+/* Predicate: ge */
+pure fn ge(x: int, y: int) -> bool { ret x >= y; }
-fn positive(int x) -> bool { ret x > 0; }
+/* Predicate: gt */
+pure fn gt(x: int, y: int) -> bool { ret x > y; }
-fn negative(int x) -> bool { ret x < 0; }
+/* Predicate: positive */
+pure fn positive(x: int) -> bool { ret x > 0; }
-fn nonpositive(int x) -> bool { ret x <= 0; }
+/* Predicate: negative */
+pure fn negative(x: int) -> bool { ret x < 0; }
-fn nonnegative(int x) -> bool { ret x >= 0; }
+/* Predicate: nonpositive */
+pure fn nonpositive(x: int) -> bool { ret x <= 0; }
+
+/* Predicate: nonnegative */
+pure fn nonnegative(x: int) -> bool { ret x >= 0; }
// FIXME: Make sure this works with negative integers.
-fn hash(&int x) -> uint { ret x as uint; }
+/*
+Function: hash
+
+Produce a uint suitable for use in a hash table
+*/
+fn hash(x: int) -> uint { ret x as uint; }
-fn eq_alias(&int x, &int y) -> bool { ret x == y; }
+/*
+Function: range
+
+Iterate over the range [`lo`..`hi`)
+*/
+fn range(lo: int, hi: int, it: block(int)) {
+ while lo < hi { it(lo); lo += 1; }
+}
-iter range(int lo, int hi) -> int {
- let int lo_ = lo;
- while (lo_ < hi) { put lo_; lo_ += 1; }
+/*
+Function: parse_buf
+
+Parse a buffer of bytes
+
+Parameters:
+
+buf - A byte buffer
+radix - The base of the number
+
+Failure:
+
+buf must not be empty
+*/
+fn parse_buf(buf: [u8], radix: uint) -> int {
+ if vec::len::<u8>(buf) == 0u {
+ log_err "parse_buf(): buf is empty";
+ fail;
+ }
+ let i = vec::len::<u8>(buf) - 1u;
+ let start = 0u;
+ let power = 1;
+
+ if buf[0] == ('-' as u8) {
+ power = -1;
+ start = 1u;
+ }
+ let n = 0;
+ while true {
+ let digit = alt buf[i] as char {
+ '0' to '9' { buf[i] - ('0' as u8) }
+ 'a' to 'z' { 10u8 + buf[i] - ('a' as u8) }
+ 'A' to 'Z' { 10u8 + buf[i] - ('A' as u8) }
+ };
+ if (digit as uint) >= radix {
+ fail;
+ }
+ n += (digit as int) * power;
+ power *= radix as int;
+ if i <= start { ret n; }
+ i -= 1u;
+ }
+ fail;
}
-fn to_str(int n, uint radix) -> str {
+/*
+Function: from_str
+
+Parse a string to an int
+
+Failure:
+
+s must not be empty
+*/
+fn from_str(s: str) -> int { parse_buf(str::bytes(s), 10u) }
+
+/*
+Function: to_str
+
+Convert to a string in a given base
+*/
+fn to_str(n: int, radix: uint) -> str {
assert (0u < radix && radix <= 16u);
- ret if (n < 0) {
+ ret if n < 0 {
"-" + uint::to_str(-n as uint, radix)
} else { uint::to_str(n as uint, radix) };
}
-fn str(int i) -> str { ret to_str(i, 10u); }
-
-fn pow(int base, uint exponent) -> int {
- ret if (exponent == 0u) {
- 1
- } else if (base == 0) {
- 0
- } else {
- auto accum = base;
- auto count = exponent;
- while (count > 1u) { accum *= base; count -= 1u; }
- accum
- };
+
+/*
+Function: str
+
+Convert to a string
+*/
+fn str(i: int) -> str { ret to_str(i, 10u); }
+
+/*
+Function: pow
+
+Returns `base` raised to the power of `exponent`
+*/
+fn pow(base: int, exponent: uint) -> int {
+ if exponent == 0u { ret 1; } //Not mathemtically true if [base == 0]
+ if base == 0 { ret 0; }
+ let my_pow = exponent;
+ let acc = 1;
+ let multiplier = base;
+ while(my_pow > 0u) {
+ if my_pow % 2u == 1u {
+ acc *= multiplier;
+ }
+ my_pow /= 2u;
+ multiplier *= multiplier;
+ }
+ ret acc;
}
// Local Variables:
// mode: rust;
projects / rust.git / blobdiff