comparison: sources/format.cpp
sources/format.cpp
- changeset 83
- 08bfc3d9d2ae
- parent 82
- 895088452014
- child 84
- 3bd32eec3d57
- child 85
- ed61569c501f
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| 82:895088452014 | 83:08bfc3d9d2ae |
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| 1 /* | |
| 2 Copyright 2014, 2015 Teemu Piippo | |
| 3 All rights reserved. | |
| 4 | |
| 5 Redistribution and use in source and binary forms, with or without | |
| 6 modification, are permitted provided that the following conditions | |
| 7 are met: | |
| 8 | |
| 9 1. Redistributions of source code must retain the above copyright | |
| 10 notice, this list of conditions and the following disclaimer. | |
| 11 2. Redistributions in binary form must reproduce the above copyright | |
| 12 notice, this list of conditions and the following disclaimer in the | |
| 13 documentation and/or other materials provided with the distribution. | |
| 14 3. Neither the name of the copyright holder nor the names of its | |
| 15 contributors may be used to endorse or promote products derived from | |
| 16 this software without specific prior written permission. | |
| 17 | |
| 18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
| 20 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A | |
| 21 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER | |
| 22 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 23 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 24 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 25 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 26 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 27 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 28 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #include <cstdio> | |
| 32 #include "format.h" | |
| 33 | |
| 34 // ------------------------------------------------------------------------------------------------- | |
| 35 // | |
| 36 // Throws an error while formatting the string | |
| 37 // | |
| 38 static auto format_error (String fmtstr, const String errdescribe, int pos) -> void | |
| 39 { | |
| 40 fmtstr.replace ("\n", " "); | |
| 41 fmtstr.replace ("\t", " "); | |
| 42 String errmsg ("With format string:\n" + fmtstr + "\n"); | |
| 43 | |
| 44 for (int x = 0; x < pos; ++x) | |
| 45 errmsg += "-"; | |
| 46 | |
| 47 errmsg += "^\n" + errdescribe; | |
| 48 throw std::logic_error (errmsg.std_string()); | |
| 49 } | |
| 50 | |
| 51 // ------------------------------------------------------------------------------------------------- | |
| 52 // | |
| 53 // Main formatter algorithm. | |
| 54 // | |
| 55 auto format_args (const String& fmtstr, const Vector<String>& args) -> String | |
| 56 { | |
| 57 String fmt = fmtstr; | |
| 58 int pos = 0; | |
| 59 | |
| 60 while ((pos = fmt.find ("%", pos)) != -1) | |
| 61 { | |
| 62 if (fmt[pos + 1] == '%') | |
| 63 { | |
| 64 fmt.replace (pos, 2, "%"); | |
| 65 pos++; | |
| 66 continue; | |
| 67 } | |
| 68 | |
| 69 int ofs = 1; | |
| 70 char mod = '\0'; | |
| 71 | |
| 72 // handle modifiers | |
| 73 if (fmt[pos + ofs] == 's' or fmt[pos + ofs] == 'x' or fmt[pos + ofs] == 'd') | |
| 74 { | |
| 75 mod = fmt[pos + ofs]; | |
| 76 ofs++; | |
| 77 } | |
| 78 | |
| 79 if (fmt[pos + ofs] < '1' or fmt[pos + ofs] > '9') | |
| 80 { | |
| 81 format_error (fmtstr, "bad format string, expected non-zero digit with " | |
| 82 "optional modifier after '%%'", pos); | |
| 83 } | |
| 84 | |
| 85 int i = fmt[pos + ofs] - '0'; | |
| 86 | |
| 87 if (i > args.size()) | |
| 88 format_error (fmtstr, String ("Format argument #") + i + " used but not defined.", pos); | |
| 89 | |
| 90 String replacement = args[i - 1]; | |
| 91 | |
| 92 switch (mod) | |
| 93 { | |
| 94 case 's': replacement = (replacement == "1") ? "" : "s"; break; | |
| 95 case 'd': replacement.sprintf ("%d", replacement[0]); break; | |
| 96 case 'x': replacement.sprintf ("0x%x", replacement.to_int()); break; | |
| 97 default: break; | |
| 98 } | |
| 99 | |
| 100 fmt.replace (pos, 1 + ofs, replacement); | |
| 101 pos += replacement.length(); | |
| 102 } | |
| 103 | |
| 104 return fmt; | |
| 105 } | |
| 106 |
