Converted the floating point types to the new string conversion functions.

Also fixed all conflicting calls of the old functions in the rest of the codebase.

The set of string conversion functions for each float type now consists of those items:
- to_str(), converts to number in base 10
- to_str_hex(), converts to number in base 16
- to_str_radix(), converts to number in given radix
- to_str_exact(), converts to number in base 10 with a exact number of trailing digits
- to_str_digits(), converts to number in base 10 with a maximum number of trailing digits
- implementations for to_str::ToStr and num::ToStrRadix
- from_str(), parses a string as number in base 10 including decimal exponent and special values
- from_str_hex(), parses a string as a number in base 16 including binary exponent and special values
- from_str_radix(), parses a string as a number in a given base excluding any exponent and special values
- implementations for from_str::FromStr and num::FromStrRadix

Author: Kimundi

src/libcore/extfmt.rs

@@ -563,7 +563,7 @@ pub mod rt {
     pub pure fn conv_float(cv: Conv, f: float) -> ~str {
         let (to_str, digits) = match cv.precision {
               CountIs(c) => (float::to_str_exact, c as uint),
-              CountImplied => (float::to_str, 6u)
+              CountImplied => (float::to_str_digits, 6u)
         };
         let mut s = unsafe { to_str(f, digits) };
         if 0.0 <= f {

src/libcore/num/f32.rs

@@ -18,6 +18,9 @@ use cmath;
 use cmp;
 use libc::{c_float, c_int};
 use num;
+use option::Option;
+use from_str;
+use to_str;
 
 pub use cmath::c_float_targ_consts::*;
 
@@ -333,6 +336,197 @@ impl f32: num::Round {
     }
 }
 
+/**
+ * Section: String Conversions
+ */
+
+/**
+ * Converts a float to a string
+ *
+ * # Arguments
+ *
+ * * num - The float value
+ */
+#[inline(always)]
+pub pure fn to_str(num: f32) -> ~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: f32) -> ~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: f32, 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: f32, 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: f32, dig: uint) -> ~str {
+    let (r, _) = num::to_str_common(
+        &num, 10u, true, true, num::SignNeg, num::DigMax(dig));
+    r
+}
+
+impl f32: to_str::ToStr {
+    #[inline(always)]
+    pure fn to_str() -> ~str { to_str_digits(self, 8) }
+}
+
+impl f32: 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<f32> {
+    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<f32> {
+    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<f32> {
+    num::from_str_common(num, rdx, true, true, false, num::ExpNone, false)
+}
+
+impl f32: from_str::FromStr {
+    #[inline(always)]
+    static pure fn from_str(val: &str) -> Option<f32> { from_str(val) }
+}
+
+impl f32: num::FromStrRadix {
+    #[inline(always)]
+    static pure fn from_str_radix(val: &str, rdx: uint) -> Option<f32> {
+        from_str_radix(val, rdx)
+    }
+}
+
 //
 // Local Variables:
 // mode: rust