stdlib: Remove transitional extfmt.RT module

Author: brson

src/lib/extfmt.rs

@@ -17,10 +17,10 @@ import option::none;
 import option::some;
 
 /*
- * We have a CT (compile-time) module that parses format strings into a
+ * We have a 'ct' (compile-time) module that parses format strings into a
  * sequence of conversions. From those conversions AST fragments are built
- * that call into properly-typed functions in the RT (run-time) module.  Each
- * of those run-time conversion functions accepts another conversion
+ * that call into properly-typed functions in the 'rt' (run-time) module.
+ * Each of those run-time conversion functions accepts another conversion
  * description that specifies how to format its output.
  *
  * The building of the AST is currently done in a module inside the compiler,
@@ -558,259 +558,6 @@ mod rt {
     }
 }
 
-// FIXME: This is a temporary duplication of the rt mod that only
-// needs to exist to accomodate the stage0 compiler until the next snapshot
-mod RT {
-    tag flag {
-        flag_left_justify;
-        flag_left_zero_pad;
-        flag_space_for_sign;
-        flag_sign_always;
-        flag_alternate;
-        // FIXME: This is a hack to avoid creating 0-length vec exprs,
-        // which have some difficulty typechecking currently. See
-        // comments in front::extfmt::make_flags
-        flag_none;
-    }
-
-    tag count {
-        count_is(int);
-        count_implied;
-    }
-
-    tag ty {
-        ty_default;
-        ty_bits;
-        ty_hex_upper;
-        ty_hex_lower;
-        ty_octal;
-    }
-
-    // FIXME: May not want to use a vector here for flags;
-    // instead just use a bool per flag
-    type conv = rec(vec[flag] flags,
-                    count width,
-                    count precision,
-                    ty ty);
-
-    fn conv_int(&conv cv, int i) -> str {
-        auto radix = 10u;
-        auto prec = get_int_precision(cv);
-        auto s = int_to_str_prec(i, radix, prec);
-        if (0 <= i) {
-            if (have_flag(cv.flags, flag_sign_always)) {
-                s = "+" + s;
-            } else if (have_flag(cv.flags, flag_space_for_sign)) {
-                s = " " + s;
-            }
-        }
-        ret pad(cv, s, pad_signed);
-    }
-
-    fn conv_uint(&conv cv, uint u) -> str {
-        auto prec = get_int_precision(cv);
-        auto res;
-        alt (cv.ty) {
-            case (ty_default) {
-                res = uint_to_str_prec(u, 10u, prec);
-            }
-            case (ty_hex_lower) {
-                res = uint_to_str_prec(u, 16u, prec);
-            }
-            case (ty_hex_upper) {
-                res = _str::to_upper(uint_to_str_prec(u, 16u, prec));
-            }
-            case (ty_bits) {
-                res = uint_to_str_prec(u, 2u, prec);
-            }
-            case (ty_octal) {
-                res = uint_to_str_prec(u, 8u, prec);
-            }
-        }
-        ret pad(cv, res, pad_unsigned);
-    }
-
-    fn conv_bool(&conv cv, bool b) -> str {
-        auto s;
-        if (b) {
-            s = "true";
-        } else {
-            s = "false";
-        }
-        // run the boolean conversion through the string conversion logic,
-        // giving it the same rules for precision, etc.
-        ret conv_str(cv, s);
-    }
-
-    fn conv_char(&conv cv, char c) -> str {
-        ret pad(cv, _str::from_char(c), pad_nozero);
-    }
-
-    fn conv_str(&conv cv, str s) -> str {
-        auto unpadded = s;
-        alt (cv.precision) {
-            case (count_implied) {
-            }
-            case (count_is(?max)) {
-                // For strings, precision is the maximum characters displayed
-                if (max as uint < _str::char_len(s)) {
-                    // FIXME: substr works on bytes, not chars!
-                    unpadded = _str::substr(s, 0u, max as uint);
-                }
-            }
-        }
-        ret pad(cv, unpadded, pad_nozero);
-    }
-
-    // Convert an int to string with minimum number of digits. If precision is
-    // 0 and num is 0 then the result is the empty string.
-    fn int_to_str_prec(int num, uint radix, uint prec) -> str {
-        if (num < 0) {
-            ret "-" + uint_to_str_prec((-num) as uint, radix, prec);
-        } else {
-            ret uint_to_str_prec(num as uint, radix, prec);
-        }
-    }
-
-    // Convert a uint to string with a minimum number of digits.  If precision
-    // is 0 and num is 0 then the result is the empty string. Could move this
-    // to _uint: but it doesn't seem all that useful.
-    fn uint_to_str_prec(uint num, uint radix, uint prec) -> str {
-        auto s;
-
-        if (prec == 0u && num == 0u) {
-            s = "";
-        } else {
-            s = _uint::to_str(num, radix);
-            auto len = _str::char_len(s);
-            if (len < prec) {
-                auto diff = prec - len;
-                auto pad = str_init_elt('0', diff);
-                s = pad + s;
-            }
-        }
-
-        ret s;
-    }
-
-    fn get_int_precision(&conv cv) -> uint {
-        alt (cv.precision) {
-            case (count_is(?c)) {
-                ret c as uint;
-            }
-            case (count_implied) {
-                ret 1u;
-            }
-        }
-    }
-
-    // FIXME: This might be useful in _str: but needs to be utf8 safe first
-    fn str_init_elt(char c, uint n_elts) -> str {
-        auto svec = _vec::init_elt[u8](c as u8, n_elts);
-        // FIXME: Using unsafe_from_bytes because rustboot
-        // can't figure out the is_utf8 predicate on from_bytes?
-        ret _str::unsafe_from_bytes(svec);
-    }
-
-    tag pad_mode {
-        pad_signed;
-        pad_unsigned;
-        pad_nozero;
-    }
-
-    fn pad(&conv cv, str s, pad_mode mode) -> str {
-        auto uwidth;
-        alt (cv.width) {
-            case (count_implied) {
-                ret s;
-            }
-            case (count_is(?width)) {
-                // FIXME: Maybe width should be uint
-                uwidth = width as uint;
-            }
-        }
-
-        auto strlen = _str::char_len(s);
-        if (uwidth <= strlen) {
-            ret s;
-        }
-
-        auto padchar = ' ';
-        auto diff = uwidth - strlen;
-        if (have_flag(cv.flags, flag_left_justify)) {
-            auto padstr = str_init_elt(padchar, diff);
-            ret s + padstr;
-        }
-
-        auto might_zero_pad = false;
-        auto signed = false;
-
-        alt (mode) {
-            case (pad_nozero) {
-                // fallthrough
-            }
-            case (pad_signed) {
-                might_zero_pad = true;
-                signed = true;
-            }
-            case (pad_unsigned) {
-                might_zero_pad = true;
-            }
-        }
-
-        fn have_precision(&conv cv) -> bool {
-            alt (cv.precision) {
-                case (count_implied) {
-                    ret false;
-                }
-                case (_) {
-                    ret true;
-                }
-            }
-        }
-
-        auto zero_padding = false;
-        if (might_zero_pad
-            && have_flag(cv.flags, flag_left_zero_pad)
-            && !have_precision(cv)) {
-
-            padchar = '0';
-            zero_padding = true;
-        }
-
-        auto padstr = str_init_elt(padchar, diff);
-
-        // This is completely heinous. If we have a signed value then
-        // potentially rip apart the intermediate result and insert some
-        // zeros. It may make sense to convert zero padding to a precision
-        // instead.
-        if (signed
-            && zero_padding
-            && _str::byte_len(s) > 0u) {
-
-            auto head = s.(0);
-            if (head == '+' as u8
-                || head == '-' as u8
-                || head == ' ' as u8) {
-
-                auto headstr = _str::unsafe_from_bytes([head]);
-                auto bytelen = _str::byte_len(s);
-                auto numpart = _str::substr(s, 1u, bytelen - 1u);
-                ret headstr + padstr + numpart;
-            }
-        }
-        ret padstr + s;
-    }
-
-    fn have_flag(vec[flag] flags, flag f) -> bool {
-        for (flag candidate in flags) {
-            if (candidate == f) {
-                ret true;
-            }
-        }
-        ret false;
-    }
-}
 
 // Local Variables:
 // mode: rust;