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309 lines
9.0 KiB
C++
309 lines
9.0 KiB
C++
//
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// File: VLPitchName.cpp - Translate between (MIDI) pitches and their UTF-8 representation
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//
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// Author(s):
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//
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// (MN) Matthias Neeracher
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//
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// Copyright © 2011 Matthias Neeracher
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//
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#include "VLPitchName.h"
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#include "VLModel.h"
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#define SHARP "\xE2\x99\xAF"
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#define FLAT "\xE2\x99\xAD"
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#define SCALE "C D EF G A B"
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const char * kVLSharpStr = SHARP;
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const char * kVLFlatStr = FLAT;
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const char * kVL2SharpStr = "\xF0\x9D\x84\xAA";
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const char * kVL2FlatStr = "\xF0\x9D\x84\xAB";
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const char * kVLNaturalStr = "\xE2\x99\xAE";
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const char * kVLFancyNames[] =
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{
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SCALE, "R", kVLNaturalStr, kVL2SharpStr, kVLSharpStr, "", kVLFlatStr, kVL2FlatStr
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};
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const char * kVLFancyChordNames[] =
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{
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SCALE, "R", "", kVL2SharpStr, kVLSharpStr, "", kVLFlatStr, kVL2FlatStr
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};
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const char * kVLLilypondNames[] =
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{
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"c d ef g a b", "r", "", "isis", "is", "", "es", "eses"
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};
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const int8_t kAccidentalBase = 5;
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std::string VLPitchName(int8_t pitch, uint16_t accidental, int * octave, const char *names[])
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{
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const char * kScale = names[0];
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const char * kRest = names[1];
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if (pitch == VLNote::kNoPitch)
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return kRest;
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int8_t adjust;
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int8_t semi;
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accidental &= VLNote::kAccidentalsMask;
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switch (accidental) {
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case VLNote::kWant2Flat:
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adjust = 2;
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break;
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case VLNote::kWantFlat:
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adjust = 1;
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break;
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case VLNote::kWantSharp:
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adjust = -1;
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break;
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case VLNote::kWant2Sharp:
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adjust = -2;
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break;
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default:
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adjust = 0;
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break;
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}
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pitch += adjust;
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semi = pitch % 12;
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//
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// Will either succeed immediately, or after one adjustment
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//
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if (kScale[semi] == ' ')
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if (adjust < 0 || (accidental & VLNote::kPreferFlats) == VLNote::kPreferFlats) {
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++adjust;
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++pitch;
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semi = (semi+1)%12;
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} else {
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--adjust;
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--pitch;
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semi = (semi+11)%12;
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}
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std::string name = std::string(1, kScale[semi]);
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if (octave)
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*octave = (pitch / VLNote::kOctave)-5;
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if (adjust)
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return name+names[adjust+kAccidentalBase];
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else if ((accidental & VLNote::kWantNatural) == VLNote::kWantNatural)
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return name+names[2];
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else
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return name;
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}
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static bool TestAccidental(uint16_t acc, int8_t adjust, std::string & str, size_t at,
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const char * fancyStr, const char * asciiString,
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int8_t & pitch, uint16_t * accidental)
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{
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size_t sz = str.size()-at;
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size_t fancySz = strlen(fancyStr);
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if (sz >= fancySz && !memcmp(fancyStr, &str[at], fancySz)) {
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pitch += adjust;
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*accidental = acc;
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str.erase(at, fancySz);
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return true;
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}
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size_t asciiSz = strlen(asciiString);
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if (!asciiSz || sz < asciiSz)
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return false;
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for (size_t cmp = at; *asciiString; )
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if (std::toupper(str[cmp++]) != *asciiString++)
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return false;
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pitch += adjust;
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*accidental = acc;
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str.erase(at, asciiSz);
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return true;
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}
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int8_t VLParsePitch(std::string & str, size_t at, uint16_t * accidental)
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{
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int8_t pitch = VLNote::kNoPitch;
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//
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// Determine key
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//
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if (const char * key = strchr(SCALE, std::toupper(str[at]))) {
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pitch = key-SCALE+VLNote::kMiddleC;
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} else if (str[at] == 'r' || str[at] == 's') {
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str.erase(at, 1); // Rest
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return VLNote::kNoPitch;
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} else
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return kPitchError;
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str.erase(at, 1);
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//
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// Look for accidentals
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//
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TestAccidental(VLNote::kWant2Flat, -2, str, at, kVL2FlatStr, "BB", pitch, accidental) ||
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TestAccidental(VLNote::kWantFlat, -1, str, at, kVLFlatStr, "B", pitch, accidental) ||
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TestAccidental(VLNote::kWantNatural, 0, str, at, kVLNaturalStr, "", pitch, accidental) ||
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TestAccidental(VLNote::kWant2Sharp, 2, str, at, kVL2SharpStr, "##", pitch, accidental) ||
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TestAccidental(VLNote::kWantSharp, 1, str, at, kVLSharpStr, "#", pitch, accidental) ||
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(*accidental = 0);
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return pitch;
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}
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static const char * kStepNames[] = {
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"", "", "sus2", "", "", "sus", FLAT "5", "", SHARP "5", "6",
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"7", SHARP "7", "", FLAT "9", "9", SHARP "9", "",
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"11", SHARP "11", "", FLAT "13", "13"
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};
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#define _ VLChord::
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void VLChordName(int8_t pitch, uint16_t accidental, uint32_t steps,
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int8_t rootPitch, uint16_t rootAccidental,
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std::string & baseName, std::string & extName, std::string & rootName,
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const char * names[])
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{
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baseName = VLPitchName(pitch, accidental, 0, names);
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if (rootPitch == VLNote::kNoPitch)
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rootName.clear();
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else
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rootName = VLPitchName(rootPitch, rootAccidental, 0, names);
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//
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// m / dim
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//
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extName.erase();
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if (steps & _ kmMin3rd)
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if (steps & _ kmDim5th
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&& !(steps & (_ km5th|_ kmMin7th|_ kmMaj7th|_ kmMin9th|_ kmMaj9th|
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_ km11th|_ kmAug11th|_ kmMin13th|_ kmMaj13th))
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) {
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extName += "dim";
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steps|= (steps & _ kmDim7th) << 1;
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steps&= ~(_ kmMin3rd|_ kmDim5th|_ kmDim7th);
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} else {
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baseName += "m";
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steps&= ~_ kmMin3rd;
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}
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//
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// +
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//
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steps &= ~(_ kmUnison | _ kmMaj3rd | _ km5th);
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if (steps == _ kmAug5th) {
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extName += "+";
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steps= 0;
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}
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//
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// Maj
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//
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if (steps & _ kmMaj7th) {
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extName += "Maj";
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steps &= ~_ kmMaj7th;
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steps |= +_ kmMin7th; // Write out the 7 for clarification
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}
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//
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// 6/9
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//
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if ((steps & (_ kmDim7th|_ kmMaj9th)) == (_ kmDim7th|_ kmMaj9th)) {
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extName += "69";
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steps &= ~(_ kmDim7th|_ kmMaj9th);
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}
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//
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// Other extensions. Only the highest unaltered extension is listed.
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//
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bool has7th = steps & (_ kmMin7th|_ kmMaj7th);
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bool has9th = steps & (_ kmMin9th|_ kmMaj9th|_ kmAug9th);
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if ((steps & _ kmMaj13th) && has7th && has9th ) {
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extName += kStepNames[_ kMaj13th];
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steps &= ~(_ kmMin7th |_ kmMaj9th |_ km11th |_ kmMaj13th);
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} else if ((steps & _ km11th) && has7th && has9th) {
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extName += kStepNames[_ k11th];
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steps &= ~(_ kmMin7th | _ kmMaj9th | _ km11th);
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} else if ((steps & _ kmMaj9th) && has7th) {
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extName += kStepNames[_ kMaj9th];
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steps &= ~(_ kmMin7th | _ kmMaj9th);
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} else if (steps & _ kmMin7th) {
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extName += kStepNames[_ kMin7th];
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steps &= ~(_ kmMin7th);
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}
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for (int step = _ kMin2nd; steps; ++step)
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if (steps & (1 << step)) {
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if ((1 << step) & (_ kmMaj9th|_ km11th|_ kmMaj13th))
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extName += "add";
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extName += kStepNames[step];
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steps &= ~(1 << step);
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}
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}
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static const VLChordModifier kModifiers[] = {
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{"b13", _ kmMin13th, 0},
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{FLAT "13", _ kmMin13th, 0},
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{"add13", _ kmMaj13th, 0},
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{"13", _ kmMin7th | _ kmMaj9th | _ km11th | _ kmMaj13th, 0},
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{"#11", _ kmAug11th, _ km11th},
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{SHARP "11", _ kmAug11th, _ km11th},
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{"+11", _ kmAug11th, _ km11th},
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{"add11", _ km11th, 0},
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{"11", _ kmMin7th | _ kmMaj9th | _ km11th, 0},
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{"#9", _ kmAug9th, _ kmMaj9th},
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{SHARP "9", _ kmAug9th, _ kmMaj9th},
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{"+9", _ kmAug9th, _ kmMaj9th},
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{"b9", _ kmMin9th, _ kmMaj9th},
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{FLAT "9", _ kmMin9th, _ kmMaj9th},
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{"-9", _ kmMin9th, _ kmMaj9th},
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{"69", _ kmDim7th | _ kmMaj9th, 0},
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{"add9", _ kmMaj9th, 0},
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{"9", _ kmMin7th | _ kmMaj9th, 0},
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{"7", _ kmMin7th, 0},
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{"maj", _ kmMaj7th, _ kmMin7th},
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{"6", _ kmDim7th, 0},
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{"#5", _ kmAug5th, _ km5th},
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{SHARP "5", _ kmAug5th, _ km5th},
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{"+5", _ kmAug5th, _ km5th},
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{"aug", _ kmAug5th, _ km5th},
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{"+", _ kmAug5th, _ km5th},
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{"b5", _ kmDim5th, _ km5th},
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{FLAT "5", _ kmDim5th, _ km5th},
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{"-5", _ kmDim5th, _ km5th},
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{"sus4", _ km4th, _ kmMaj3rd},
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{"sus2", _ kmMaj2nd, _ kmMaj3rd},
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{"sus", _ km4th, _ kmMaj3rd},
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{"4", _ km4th, _ kmMaj3rd},
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{"add3", _ kmMaj3rd, 0},
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{"2", _ kmMaj2nd, _ kmMaj3rd},
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{NULL, 0, 0}
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};
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int8_t VLParseChord(std::string & str, uint16_t * accidental, uint32_t * steps,
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int8_t * rootPitch, uint16_t * rootAccidental)
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{
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int8_t pitch = VLParsePitch(str, 0, accidental);
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if (pitch < 0)
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return pitch;
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size_t root = str.find('/');
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if (root != std::string::npos) {
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*rootPitch = VLParsePitch(str, root+1, rootAccidental);
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if (*rootPitch < 0)
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return kPitchError;
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str.erase(root, 1);
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*rootPitch -= VLNote::kOctave;
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} else {
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*rootPitch = VLNote::kNoPitch;
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*rootAccidental = 0;
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}
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//
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// Apply modifiers
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//
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*steps = _ kmUnison | _ kmMaj3rd | _ km5th;
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for (const VLChordModifier * mod = kModifiers; mod->fName && str.size()
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&& str != "dim" && str != "m" && str != "-"; ++mod
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) {
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size_t pos = str.find(mod->fName);
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if (pos != std::string::npos) {
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str.erase(pos, strlen(mod->fName));
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*steps &= ~mod->fDelSteps;
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*steps |= mod->fAddSteps;
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}
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}
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if (str == "m" || str == "-") {
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*steps = (*steps & ~_ kmMaj3rd) | _ kmMin3rd;
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str.erase(0, 1);
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} else if (str == "dim") {
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uint32_t st = *steps & (_ kmMaj3rd |_ km5th |_ kmMin7th);
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*steps = (*steps ^ st) | (st >> 1); // Diminish 3rd, 5th, and 7th, if present
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str.erase(0, 3);
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}
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return str.empty() ? pitch : kPitchError;
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}
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