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abcparse.c
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/*
* Generic ABC parser.
*
* This file is part of abcm2ps.
*
* Copyright (C) 1998-2021 Jean-François Moine (http://moinejf.free.fr)
* Adapted from abc2ps, Copyright (C) 1996-1998 Michael Methfessel
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "abcm2ps.h"
/* global values */
int severity; /* error severity */
static int ulen; /* unit note length set by M: or L: */
static short meter; /* upper value of time sig for n-plets */
static unsigned char microscale; /* current microtone scale */
static signed char vover; /* voice overlay (1: single bar, -1: multi-bar */
static char lyric_started; /* lyric started */
static char *gchord; /* guitar chord */
static struct decos dc; /* decorations */
static struct SYMBOL *deco_start; /* 1st note of the line for d: / s: */
static struct SYMBOL *deco_cont; /* current symbol when d: / s: continuation */
static int g_abc_vers, g_ulen, g_microscale;
static char g_char_tb[128];
static char *g_deco_tb[128]; /* global decoration names */
static unsigned short g_micro_tb[MAXMICRO]; /* global microtone values */
static char *abc_fn; /* current source file name */
static int linenum; /* current source line number */
static int colnum; /* current source column number */
static char *abc_line; /* line being parsed */
static struct SYMBOL *last_sym; /* last symbol for errors */
static short nvoice; /* number of voices (0..n-1) */
struct VOICE_S *curvoice; /* current voice while parsing */
struct parse parse;
/* char table for note line parsing */
#define CHAR_BAD 0
#define CHAR_IGN 1
#define CHAR_NOTE 2
#define CHAR_GR_ST 3
#define CHAR_DECO 4
#define CHAR_GCHORD 5
#define CHAR_BSLASH 6
#define CHAR_OBRA 7
#define CHAR_BAR 8
#define CHAR_OPAR 9
#define CHAR_VOV 10
#define CHAR_SPAC 11
#define CHAR_MINUS 12
#define CHAR_CPAR 13
#define CHAR_BRHY 14
#define CHAR_DECOS 15
#define CHAR_SLASH 16
#define CHAR_GR_EN 17
#define CHAR_LINEBREAK 18
static char char_tb[256] = {
0, 0, 0, 0, 0, 0, 0, 0, /* 00 - 07 */
0, CHAR_SPAC, CHAR_LINEBREAK, 0, 0, 0, 0, 0, /* 08 - 0f */
0, 0, 0, 0, 0, 0, 0, 0, /* 10 - 17 */
0, 0, 0, 0, 0, 0, 0, 0, /* 18 - 1f */
CHAR_SPAC, CHAR_DECOS, CHAR_GCHORD, CHAR_BAD, /* (sp) ! " # */
CHAR_BAD, CHAR_BAD, CHAR_VOV, CHAR_BAD, /* $ % & ' */
CHAR_OPAR, CHAR_CPAR, CHAR_BAD, CHAR_DECOS, /* ( ) * + */
CHAR_BAD, CHAR_MINUS, CHAR_DECO, CHAR_SLASH, /* , - . / */
CHAR_BAD, CHAR_BAD, CHAR_BAD, CHAR_BAD, /* 0 1 2 3 */
CHAR_BAD, CHAR_BAD, CHAR_BAD, CHAR_BAD, /* 4 5 6 7 */
CHAR_BAD, CHAR_BAD, CHAR_BAR, CHAR_BAD, /* 8 9 : ; */
CHAR_BRHY, CHAR_NOTE, CHAR_BRHY, CHAR_BAD, /* < = > ? */
CHAR_BAD, CHAR_NOTE, CHAR_NOTE, CHAR_NOTE, /* @ A B C */
CHAR_NOTE, CHAR_NOTE, CHAR_NOTE, CHAR_NOTE, /* D E F G */
CHAR_DECO, CHAR_DECO, CHAR_DECO, CHAR_DECO, /* H I J K */
CHAR_DECO, CHAR_DECO, CHAR_DECO, CHAR_DECO, /* L M N O */
CHAR_DECO, CHAR_DECO, CHAR_DECO, CHAR_DECO, /* P Q R S */
CHAR_DECO, CHAR_DECO, CHAR_DECO, CHAR_DECO, /* T U V W */
CHAR_NOTE, CHAR_DECO, CHAR_NOTE, CHAR_OBRA, /* X Y Z [ */
CHAR_BSLASH, CHAR_BAR, CHAR_NOTE, CHAR_NOTE, /* \ ] ^ _ */
CHAR_IGN, CHAR_NOTE, CHAR_NOTE, CHAR_NOTE, /* ` a b c */
CHAR_NOTE, CHAR_NOTE, CHAR_NOTE, CHAR_NOTE, /* d e f g */
CHAR_DECO, CHAR_DECO, CHAR_DECO, CHAR_DECO, /* h i j k */
CHAR_DECO, CHAR_DECO, CHAR_DECO, CHAR_DECO, /* l m n o */
CHAR_DECO, CHAR_DECO, CHAR_DECO, CHAR_DECO, /* p q r s */
CHAR_DECO, CHAR_DECO, CHAR_DECO, CHAR_DECO, /* t u v w */
CHAR_NOTE, CHAR_NOTE, CHAR_NOTE, CHAR_GR_ST, /* x y z { */
CHAR_BAR, CHAR_GR_EN, CHAR_DECO, CHAR_BAD, /* | } ~ (del) */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 80 - 8f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 90 - 9f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* a0 - af */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* b0 - bf */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* c0 - cf */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* d0 - df */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* e0 - ef */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* f0 - ff */
};
static const char all_notes[] = "CDEFGABcdefgab";
static int parse_info(char *p);
static char *parse_gchord(char *p);
static int parse_line(char *p);
static char *parse_note(char *p,
int flags);
static void syntax(char *msg, char *q);
static void vover_new(void);
/* -- abcMIDI like errors -- */
static void print_error(char *s, int col)
{
if (col >= 0)
fprintf(stderr, "%s:%d:%d: error: %s\n", abc_fn, linenum, col, s);
else
fprintf(stderr, "%s:%d: error: %s\n", abc_fn, linenum, s);
}
/* -- new symbol -- */
static struct SYMBOL *abc_new(int type, char *text)
{
struct SYMBOL *s;
s = getarena(sizeof(struct SYMBOL));
memset(s, 0, sizeof(struct SYMBOL));
if (text) {
s->text = getarena(strlen(text) + 1);
strcpy(s->text, text);
}
if (!parse.last_sym) {
parse.first_sym = s;
} else {
if ((s->abc_next = parse.last_sym->abc_next) != NULL)
s->abc_next->abc_prev = s;
parse.last_sym->abc_next = s;
s->abc_prev = parse.last_sym;
}
last_sym = parse.last_sym = s;
s->abc_type = type;
s->state = parse.abc_state;
s->fn = abc_fn;
s->linenum = linenum;
s->colnum = colnum;
return s;
}
/* -- parse an ABC line -- */
void abc_parse(char *p, char *fname, int ln)
{
abc_fn = fname;
linenum = ln;
abc_line = p;
/* parse the music line */
switch (parse_line(p)) {
case 2: /* start of tune (X:) */
g_abc_vers = parse.abc_vers;
g_ulen = ulen;
g_microscale = microscale;
meter = 2;
memcpy(g_char_tb, char_tb, sizeof g_char_tb);
memcpy(g_deco_tb, parse.deco_tb, sizeof g_deco_tb);
memcpy(g_micro_tb, parse.micro_tb, sizeof g_micro_tb);
break;
case 1: /* end of tune */
if (parse.first_sym) {
do_tune();
parse.first_sym = parse.last_sym = NULL;
}
parse.abc_state = ABC_S_GLOBAL;
parse.abc_vers = g_abc_vers;
ulen = g_ulen;
microscale = g_microscale;
memcpy(char_tb, g_char_tb, sizeof g_char_tb);
memcpy(parse.deco_tb, g_deco_tb, sizeof parse.deco_tb);
memcpy(parse.micro_tb, g_micro_tb, sizeof parse.micro_tb);
lvlarena(0);
if (dc.n > 0)
syntax("Decoration without symbol", 0);
dc.n = 0;
break;
}
}
/* treat the end of file */
void abc_eof(void)
{
// if (parse.abc_state == ABC_S_HEAD)
// severity = 1;
do_tune();
parse.first_sym = parse.last_sym = NULL;
if (parse.abc_state != ABC_S_GLOBAL) {
parse.abc_vers = g_abc_vers;
ulen = g_ulen;
microscale = g_microscale;
memcpy(char_tb, g_char_tb, sizeof g_char_tb);
}
}
/* -- treat the broken rhythm '>' and '<' -- */
static void broken_rhythm(struct SYMBOL *s,
int num) /* >0: do dot, <0: do half */
{
struct notes *notes = &s->u.note;
int l, m, n;
num *= 2;
if (num > 0) {
if (num == 6)
num = 8;
n = num * 2 - 1;
for (m = 0; m <= s->nhd; m++)
notes->notes[m].len = (notes->notes[m].len * n) / num;
} else {
n = -num;
if (n == 6)
n = 8;
for (m = 0; m <= s->nhd; m++)
notes->notes[m].len /= n;
}
l = notes->notes[0].len;
for (m = 1; m <= s->nhd; m++)
if (notes->notes[m].len < l)
l = notes->notes[m].len;
}
/* -- check for the '!' as end of line (ABC2Win) -- */
static int check_nl(char *p)
{
while (*p != '\0') {
switch (*p++) {
case '!':
return 0;
case '|':
case '[':
case ':':
case ']':
case ' ':
case '\t':
return 1;
}
}
return 1;
}
/* -- parse extra K: or V: definitions (clef, octave and microscale -- */
static char *parse_extra(char *p,
char **p_name,
char **p_middle,
char **p_stlines,
char **p_scale,
char **p_octave,
char **p_cue,
char **p_map)
{
for (;;) {
if (strncmp(p, "clef=", 5) == 0
|| strncmp(p, "bass", 4) == 0
|| strncmp(p, "treble", 6) == 0
|| strncmp(p, "alto", 4) == 0
|| strncmp(p, "tenor", 5) == 0
|| strncmp(p, "perc", 4) == 0) {
if (*p_name)
syntax("Double clef name", p);
*p_name = p;
} else if (strncmp(p, "microscale=", 11) == 0
|| strncmp(p, "uscale=", 7) == 0) {
int i;
p += p[0] == 'm' ? 11 : 7;
i = atoi(p);
if (i < 4 || i >= 256)
syntax("Invalid value in microscale=", p);
else
microscale = i;
} else if (strncmp(p, "middle=", 7) == 0
|| strncmp(p, "m=", 2) == 0) {
if (*p_middle)
syntax("Double clef middle", p);
*p_middle = p + (p[1] == '=' ? 2 : 7);
} else if (strncmp(p, "octave=", 7) == 0) {
if (*p_octave)
syntax("Double octave=", p);
*p_octave = p + 7;
} else if (strncmp(p, "stafflines=", 11) == 0) {
int l;
char *q;
if (*p_stlines)
syntax("Double stafflines", p);
p += 11;
if (isdigit((unsigned char) *p)) {
switch (atoi(p)) {
case 0: *p_stlines = "..."; break;
case 1: *p_stlines = "..|"; break;
case 2: *p_stlines = ".||"; break;
case 3: *p_stlines = ".|||"; break;
case 4: *p_stlines = "||||"; break;
case 5: *p_stlines = "|||||"; break;
case 6: *p_stlines = "||||||"; break;
case 7: *p_stlines = "|||||||"; break;
case 8: *p_stlines = "||||||||"; break;
default:
syntax("Bad number of lines", p);
break;
}
} else {
q = p;
while (!isspace((unsigned char) *p) && *p != '\0')
p++;
l = p - q;
*p_stlines = getarena(l + 1);
strncpy(*p_stlines, q, l);
(*p_stlines)[l] = '\0';
}
} else if (strncmp(p, "staffscale=", 11) == 0) {
if (*p_scale)
syntax("Double staffscale", p);
*p_scale = p + 11;
} else if (strncmp(p, "cue=", 4) == 0) {
if (*p_cue)
syntax("Double cue", p);
*p_cue = p + 4;
} else if (strncmp(p, "map=", 4) == 0) {
if (*p_map)
syntax("Double map", p);
*p_map = p + 4;
// } else if (strncmp(p, "transpose=", 10) == 0
// || strncmp(p, "t=", 2) == 0) {
// ; /* ignored - abcMIDI */
} else {
break;
}
while (!isspace((unsigned char) *p) && *p != '\0')
p++;
while (isspace((unsigned char) *p))
p++;
if (*p == '\0')
break;
}
return p;
}
/* -- parse a decoration 'xxx<decosep>' -- */
static char *get_deco(char *p,
unsigned char *p_dc)
{
char *q, sep, **t;
unsigned i, l;
*p_dc = 0;
q = p;
sep = q[-1];
if (char_tb[(unsigned char) sep] == CHAR_DECOS) {
if (sep == '+') {
if (*p == '+' && p[1] == '+')
p++; /* special case "+++" */
}
} else {
sep = '\0'; /* Barfly U: */
}
while (*p != sep) {
if (*p == '\0') {
syntax("Decoration not terminated", q);
return p;
}
p++;
}
l = p - q;
if (*p == sep)
p++;
for (i = 1, t = &parse.deco_tb[1];
*t && i < DC_NAME_SZ;
i++, t++) {
if (strlen(*t) == l
&& strncmp(*t, q, l) == 0) {
*p_dc = i + 128;
return p;
}
}
/* new decoration */
if (i < DC_NAME_SZ) {
// if (parse.abc_state != ABC_S_GLOBAL)
// lvlarena(0);
*t = getarena(l + 1);
// if (parse.abc_state != ABC_S_GLOBAL)
// lvlarena(1);
memcpy(*t, q, l);
(*t)[l] = '\0';
*p_dc = i + 128;
} else {
syntax("Too many decoration types", q);
}
return p;
}
/* -- parse a list of accidentals (K:) -- */
static char *parse_acc(char *p,
struct SYMBOL *s)
{
int pit = 0, acc;
unsigned nacc;
nacc = 0;
for (;;) {
if (nacc >= sizeof s->u.key.pits) {
syntax("Too many accidentals", p);
break;
}
p = parse_acc_pit(p, &pit, &acc);
if (acc < 0)
break;
s->u.key.pits[nacc] = pit;
s->u.key.accs[nacc++] = acc;
while (isspace((unsigned char) *p))
p++;
if (*p == '\0')
break;
if (*p != '^' && *p != '_' && *p != '=')
break;
}
s->u.key.microscale = microscale;
if (s->u.key.empty != 2)
s->u.key.nacc = nacc;
return p;
}
/* -- parse a clef (K: or V:) -- */
static void parse_clef(struct SYMBOL *s,
char *name,
char *middle)
{
int clef = -1;
int transpose = 0;
int clef_line = 2;
char *warn = NULL;
char str[80];
str[0] = '\0';
if (name && strncmp(name, "clef=", 5) == 0) {
name += 5;
switch (*name) {
case '\"':
name = get_str(str, name, sizeof str);
s->u.clef.name = getarena(strlen(str) + 1);
strcpy(s->u.clef.name, str);
clef = TREBLE;
break;
case 'g':
warn = name;
transpose = -7;
case 'G':
clef = TREBLE;
break;
case 'f':
warn = name;
transpose = -14;
clef = BASS;
clef_line = 4;
break;
case 'F':
if (name[1] == ',') /* abc2.1.1 clef=F == clef=F, */
transpose = -7;
clef = BASS;
clef_line = 4;
break;
case 'c':
warn = name;
transpose = -7;
case 'C':
clef = ALTO;
clef_line = 3;
break;
case 'P':
clef = PERC;
clef_line = 3;
break;
}
if (clef >= 0) {
name++;
if (*name == ',' || *name== '\'')
warn = name;
while (*name == ',') {
transpose += 7;
name++;
}
while (*name == '\'') {
transpose -= 7;
name++;
}
}
}
if (name && clef < 0) {
if (!strncmp(name, "bass", 4)) {
clef = BASS;
clef_line = 4;
s->u.clef.check_pitch = 1;
name += 4;
} else if (!strncmp(name, "treble", 6)) {
clef = TREBLE;
name += 6;
} else if (!strncmp(name, "alto", 4)
|| !strncmp(name, "tenor", 5)) {
clef = ALTO;
clef_line = *name == 'a' ? 3 : 4;
s->u.clef.check_pitch = 1;
if (*name == 'a')
name += 4;
else
name += 5;
} else if (!strncmp(name, "perc", 4)) {
clef = PERC;
clef_line = 3;
name += 4;
} else if (!strncmp(name, "auto", 4)) {
clef = AUTOCLEF;
name += 4;
} else if (strncmp(name, "none", 4) == 0) {
clef = TREBLE;
s->u.clef.invis = 1;
s->flags |= ABC_F_INVIS;
name += 4;
} else {
syntax("Unknown clef", name);
clef = TREBLE;
}
}
if (clef >= 0) {
if (isdigit((unsigned char) *name))
clef_line = *name++ - '0';
if (name[1] == '8') {
switch (*name) {
case '^':
transpose -= 7;
case '+':
s->u.clef.octave = 1;
break;
case '_':
transpose += 7;
case '-':
s->u.clef.octave = -1;
break;
}
}
}
if (middle) {
int pit = 0, acc, l;
static const char line_tb[7] =
{ALTO, TREBLE, ALTO, BASS, ALTO, BASS, ALTO};
warn = middle;
/* 'middle=<note pitch>' */
parse_acc_pit(middle, &pit, &acc);
if (acc < 0) // if error
pit = 22;
if (clef < 0)
clef = line_tb[(pit + 7) % 7];
switch (clef) {
default:
l = 20 + 4;
break;
case ALTO:
l = 16 + 4;
break;
case BASS:
l = 12 + 4;
break;
}
clef_line = (l - pit + 28) % 7;
if (clef_line & 1) {
syntax("Bad 'middle' value for the clef", middle);
pit++;
}
clef_line = clef_line / 2 + 1;
transpose = l - (clef_line - 1) * 2 - pit;
s->u.clef.check_pitch = 0;
}
s->u.clef.type = clef;
s->u.clef.line = clef_line;
s->u.clef.transpose = transpose;
if (warn) {
int sev_sav;
sev_sav = severity;
syntax("Warning: Deprecated or non-standard item", warn);
severity = sev_sav;
}
}
/* get the octave= value */
static int parse_octave(char *p)
{
int oct;
if (p) {
oct = 1;
if (*p == '-') {
oct = -1;
p++;
}
if (*p >= '0' && *p <= '4')
return oct * (*p - '0');
syntax("Bad octave value", p);
}
return NO_OCTAVE;
}
/* -- parse a 'K:' -- */
static void parse_key(char *p,
struct SYMBOL *s)
{
int sf, empty, instr;
// int mode;
char *clef_name, *clef_middle, *clef_stlines, *clef_scale;
char *p_octave, *p_cue, *p_map;
// set important default values
// s->u.key.stafflines = "|||||";
s->u.key.octave = NO_OCTAVE;
if (*p == '\0') {
s->u.key.empty = 1;
return;
}
sf = 0;
// mode = 0;
empty = 0;
instr = 0;
switch (*p++) {
case 'F': sf = -1; break;
case 'B': sf++;
case 'E': sf++;
case 'A': sf++;
case 'D': sf++;
case 'G': sf++;
case 'C': break;
case 'H':
if (*p == 'P') {
instr = K_HP;
p++;
} else if (*p == 'p') {
instr = K_Hp;
sf = 2;
p++;
} else {
syntax("Unknown bagpipe-like key", p);
}
break;
case 'P':
instr = K_DRUM;
p++;
break;
case 'n':
if (strncmp(p, "one", 3) == 0) { // none
empty = 2;
p += 3;
while (isspace((unsigned char) *p))
p++;
if (*p == '\0') {
s->u.key.empty = empty;
return;
}
break;
}
// fall thru
default:
p--;
empty = 1;
break;
}
s->u.key.empty = empty;
if (!empty) {
if (*p == '#') {
sf += 7;
p++;
} else if (*p == 'b') {
sf -= 7;
p++;
}
while (isspace((unsigned char) *p))
p++;
switch (*p) {
case 'a':
case 'A':
if (strncasecmp(p, "aeo", 3) == 0) {
sf -= 3;
// mode = 5;
break;
}
goto unk;
case 'd':
case 'D':
if (strncasecmp(p, "dor", 3) == 0) {
sf -= 2;
// mode = 1;
break;
}
goto unk;
case 'i':
case 'I':
if (strncasecmp(p, "ion", 3) == 0) {
// mode = 0;
break;
}
goto unk;
case 'l':
case 'L':
if (strncasecmp(p, "loc", 3) == 0) {
sf -= 5;
// mode = 6;
break;
}
if (strncasecmp(p, "lyd", 3) == 0) {
sf += 1;
// mode = 3;
break;
}
goto unk;
case 'm':
case 'M':
if (strncasecmp(p, "maj", 3) == 0)
break;
if (strncasecmp(p, "mix", 3) == 0) {
sf -= 1;
// mode = 4;
break;
}
if (strncasecmp(p, "min", 3) == 0
|| !isalpha((unsigned char) p[1])) { /* 'm' alone */
sf -= 3;
// mode = 5;
break;
}
goto unk;
case 'p':
case 'P':
if (strncasecmp(p, "phr", 3) == 0) {
sf -= 4;
// mode = 2;
break;
}
goto unk;
default:
unk:
empty = 1; // (local value)
break;
}
if (!empty) {
while (isalpha((unsigned char) *p))
p++;
while (isspace((unsigned char) *p))
p++;
}
// [exp] accidentals
if (strncmp(p, "exp ", 4) == 0) {
p += 4;
while (isspace((unsigned char) *p))
p++;
if (*p == '\0')
syntax("no accidental after 'exp'", p);
s->u.key.exp = 1;
}
if (s->u.key.exp && strncmp(p, "none", 4) == 0) {
sf = 0;
p += 4;
while (isspace((unsigned char) *p))
p++;
} else switch (*p) {
case '^':
case '_':
case '=':
p = parse_acc(p, s); /* accidentals */
break;
}
}
if (sf > 7 || sf < -7) {
syntax("Too many sharps/flats", p);
if (sf > 0)
sf -= 12;
else
sf += 12;
}
// extra parameters
clef_name = clef_middle = clef_stlines = clef_scale = NULL;
p_octave = p_cue = p_map = NULL;
parse_extra(p, &clef_name, &clef_middle, &clef_stlines,
&clef_scale, &p_octave, &p_cue, &p_map);
s->u.key.sf = sf;
// s->u.key.mode = mode;
s->u.key.instr = instr;
s->u.key.octave = parse_octave(p_octave);
if (p_cue) {
if (strncmp(p_cue, "on", 2) == 0)
s->u.key.cue = 1;
else
s->u.key.cue = -1;
}
if (clef_stlines)
s->u.key.stafflines = clef_stlines;
if (clef_scale) {
float sc;
sc = atof(clef_scale);
if (sc >= 0.5 && sc <= 3)
s->u.key.staffscale = sc;
else
syntax("Bad value of staffscale", clef_scale);
}
if (clef_name || clef_middle) {
s = abc_new(ABC_T_CLEF, NULL);
parse_clef(s, clef_name, clef_middle);
}
if (p_map) {
strcpy(tex_buf, "%%voicemap ");
get_str(&tex_buf[11], p_map, TEX_BUF_SZ - 12);
abc_new(ABC_T_PSCOM, tex_buf);
}
}
/* -- set default length from 'L:' -- */
static char *get_len(char *p,
struct SYMBOL *s)
{
int l1, l2, d;
char *error_txt = NULL;
if (strcmp(p, "auto") == 0) { /* L:auto */
ulen = 15120; // 2*2*2*2*3*3*3*5*7
s->u.length.base_length = -1;
return error_txt;
}
l1 = 0;
l2 = 1;
if (sscanf(p, "%d /%d ", &l1, &l2) != 2
|| l1 == 0) {
s->u.length.base_length = ulen ? ulen : BASE_LEN / 8;
return "Bad unit note length: unchanged";
}
if (l2 == 0) {
error_txt = "Bad length divisor, set to 4";
l2 = 4;
}
d = BASE_LEN / l2;
if (d * l2 != BASE_LEN) {
error_txt = "Length incompatible with BASE, using 1/8";
d = BASE_LEN / 8;
} else {
d *= l1;
if (l1 != 1
|| (l2 & (l2 - 1))) {
error_txt = "Incorrect unit note length, using 1/8";
d = BASE_LEN / 8;
}
}
s->u.length.base_length = d;
return error_txt;
}
/* -- parse a 'M:' -- */
static char *parse_meter(char *p,
struct SYMBOL *s)
{
int m1, m2, d, wmeasure, nm, in_parenth;
unsigned i;
char *q;
static char top_err[] = "Cannot identify meter top";
if (*p == '\0')
return "Empty meter string";
nm = 0;
in_parenth = 0;
m1 = 0;
if (strncmp(p, "none", 4) == 0) {
p += 4; /* no meter */
wmeasure = 1; /* simplify measure numbering and MREST conversion */
} else {
wmeasure = 0;
while (*p != '\0') {
if (*p == '=')
break;
if (nm >= MAX_MEASURE)
return "Too many values in M:";
switch (*p) {
case 'C':
s->u.meter.meter[nm].top[0] = *p++;
if (*p == '|')
s->u.meter.meter[nm].top[1] = *p++;
m1 = 4;
m2 = 4;
break;
case 'c':
case 'o':
if (*p == 'c')
m1 = 4;
else
m1 = 3;
m2 = 4;
s->u.meter.meter[nm].top[0] = *p++;
if (*p == '.')
s->u.meter.meter[nm].top[1] = *p++;
break;
case '(':
if (p[1] == '(') { /* "M:5/4 ((2+3)/4)" */
in_parenth = 1;
s->u.meter.meter[nm++].top[0] = *p++;
}
q = p + 1;
while (*q != '\0') {
if (*q == ')' || *q == '/')
break;
q++;
}
if (*q == ')' && q[1] == '/') { /* "M:5/4 (2+3)/4" */
p++; /* remove the parenthesis */
continue;
} /* "M:5 (2+3)" */
/* fall thru */
case ')':
in_parenth = *p == '(';
s->u.meter.meter[nm++].top[0] = *p++;
continue;
default:
if (sscanf(p, "%d", &m1) != 1
|| m1 <= 0)
return top_err;
i = 0;
m2 = 2; /* default when no bottom value */
for (;;) {
while (isdigit((unsigned char) *p)
&& i < sizeof s->u.meter.meter[0].top)
s->u.meter.meter[nm].top[i++] = *p++;
if (*p == ')') {
if (p[1] != '/')
break;
p++;
}
if (*p == '/') {
p++;
if (sscanf(p, "%d", &m2) != 1
|| m2 <= 0)
return "Cannot identify meter bottom";
i = 0;
while (isdigit((unsigned char) *p)
&& i < sizeof s->u.meter.meter[0].bot)
s->u.meter.meter[nm].bot[i++] = *p++;
break;
}
if (*p != ' ' && *p != '+')
break;
if (*p == '\0' || p[1] == '(') /* "M:5 (2/4+3/4)" */
break;
if (i < sizeof s->u.meter.meter[0].top)
s->u.meter.meter[nm].top[i++] = *p++;
if (sscanf(p, "%d", &d) != 1
|| d <= 0)
return top_err;
if (p[-1] == ' ') {
if (d > m1)
m1 = d;
} else {
m1 += d;
}
}
break;
}
if (!in_parenth)
wmeasure += m1 * BASE_LEN / m2;
nm++;
if (*p == ' ')
p++;
else if (*p == '+')
s->u.meter.meter[nm++].top[0] = *p++;
}
}
meter = m1;