1 files changed, 194 insertions, 0 deletions
diff --git a/src/libcore/num/f64.rs b/src/libcore/num/f64.rs
index 851697012fc..276aa13da71 100644
--- a/src/libcore/num/f64.rs
+++ b/src/libcore/num/f64.rs
@@ -19,6 +19,9 @@ use cmp;
 use libc::{c_double, c_int};
 use libc;
 use num;
+use option::Option;
+use to_str;
+use from_str;
 
 pub use cmath::c_double_targ_consts::*;
 
@@ -357,6 +360,197 @@ impl f64: num::Round {
     }
 }
 
+/**
+ * Section: String Conversions
+ */
+
+/**
+ * Converts a float to a string
+ *
+ * # Arguments
+ *
+ * * num - The float value
+ */
+#[inline(always)]
+pub pure fn to_str(num: f64) -> ~str {
+    let (r, _) = num::to_str_common(
+        &num, 10u, true, true, num::SignNeg, num::DigAll);
+    r
+}
+
+/**
+ * Converts a float to a string in hexadecimal format
+ *
+ * # Arguments
+ *
+ * * num - The float value
+ */
+#[inline(always)]
+pub pure fn to_str_hex(num: f64) -> ~str {
+    let (r, _) = num::to_str_common(
+        &num, 16u, true, true, num::SignNeg, num::DigAll);
+    r
+}
+
+/**
+ * Converts a float to a string in a given radix
+ *
+ * # Arguments
+ *
+ * * num - The float value
+ * * radix - The base to use
+ */
+#[inline(always)]
+pub pure fn to_str_radix(num: f64, rdx: uint) -> ~str {
+    let (r, _) = num::to_str_common(
+        &num, rdx, true, true, num::SignNeg, num::DigAll);
+    r
+}
+
+/**
+ * Converts a float to a string with exactly the number of
+ * provided significant digits
+ *
+ * # Arguments
+ *
+ * * num - The float value
+ * * digits - The number of significant digits
+ */
+#[inline(always)]
+pub pure fn to_str_exact(num: f64, dig: uint) -> ~str {
+    let (r, _) = num::to_str_common(
+        &num, 10u, true, true, num::SignNeg, num::DigExact(dig));
+    r
+}
+
+/**
+ * Converts a float to a string with a maximum number of
+ * significant digits
+ *
+ * # Arguments
+ *
+ * * num - The float value
+ * * digits - The number of significant digits
+ */
+#[inline(always)]
+pub pure fn to_str_digits(num: f64, dig: uint) -> ~str {
+    let (r, _) = num::to_str_common(
+        &num, 10u, true, true, num::SignNeg, num::DigMax(dig));
+    r
+}
+
+impl f64: to_str::ToStr {
+    #[inline(always)]
+    pure fn to_str() -> ~str { to_str_digits(self, 8) }
+}
+
+impl f64: num::ToStrRadix {
+    #[inline(always)]
+    pure fn to_str_radix(&self, rdx: uint) -> ~str {
+        to_str_radix(*self, rdx)
+    }
+}
+
+/**
+ * Convert a string in base 10 to a float.
+ * Accepts a optional decimal exponent.
+ *
+ * This function accepts strings such as
+ *
+ * * '3.14'
+ * * '+3.14', equivalent to '3.14'
+ * * '-3.14'
+ * * '2.5E10', or equivalently, '2.5e10'
+ * * '2.5E-10'
+ * * '.' (understood as 0)
+ * * '5.'
+ * * '.5', or, equivalently,  '0.5'
+ * * '+inf', 'inf', '-inf', 'NaN'
+ *
+ * Leading and trailing whitespace represent an error.
+ *
+ * # Arguments
+ *
+ * * num - A string
+ *
+ * # Return value
+ *
+ * `none` if the string did not represent a valid number.  Otherwise,
+ * `Some(n)` where `n` is the floating-point number represented by `num`.
+ */
+#[inline(always)]
+pub pure fn from_str(num: &str) -> Option<f64> {
+    num::from_str_common(num, 10u, true, true, true, num::ExpDec, false)
+}
+
+/**
+ * Convert a string in base 16 to a float.
+ * Accepts a optional binary exponent.
+ *
+ * This function accepts strings such as
+ *
+ * * 'a4.fe'
+ * * '+a4.fe', equivalent to 'a4.fe'
+ * * '-a4.fe'
+ * * '2b.aP128', or equivalently, '2b.ap128'
+ * * '2b.aP-128'
+ * * '.' (understood as 0)
+ * * 'c.'
+ * * '.c', or, equivalently,  '0.c'
+ * * '+inf', 'inf', '-inf', 'NaN'
+ *
+ * Leading and trailing whitespace represent an error.
+ *
+ * # Arguments
+ *
+ * * num - A string
+ *
+ * # Return value
+ *
+ * `none` if the string did not represent a valid number.  Otherwise,
+ * `Some(n)` where `n` is the floating-point number represented by `[num]`.
+ */
+#[inline(always)]
+pub pure fn from_str_hex(num: &str) -> Option<f64> {
+    num::from_str_common(num, 16u, true, true, true, num::ExpBin, false)
+}
+
+/**
+ * Convert a string in an given base to a float.
+ *
+ * Due to possible conflicts, this function does **not** accept
+ * the special values `inf`, `-inf`, `+inf` and `NaN`, **nor**
+ * does it recognize exponents of any kind.
+ *
+ * Leading and trailing whitespace represent an error.
+ *
+ * # Arguments
+ *
+ * * num - A string
+ * * radix - The base to use. Must lie in the range [2 .. 36]
+ *
+ * # Return value
+ *
+ * `none` if the string did not represent a valid number. Otherwise,
+ * `Some(n)` where `n` is the floating-point number represented by `num`.
+ */
+#[inline(always)]
+pub pure fn from_str_radix(num: &str, rdx: uint) -> Option<f64> {
+    num::from_str_common(num, rdx, true, true, false, num::ExpNone, false)
+}
+
+impl f64: from_str::FromStr {
+    #[inline(always)]
+    static pure fn from_str(val: &str) -> Option<f64> { from_str(val) }
+}
+
+impl f64: num::FromStrRadix {
+    #[inline(always)]
+    static pure fn from_str_radix(val: &str, rdx: uint) -> Option<f64> {
+        from_str_radix(val, rdx)
+    }
+}
+
 //
 // Local Variables:
 // mode: rust