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list.c
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list.c
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/*
* Mathomatic expression and equation display routines.
* Color mode routines, too.
*
* Copyright (C) 1987-2012 George Gesslein II.
This library 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 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
The chief copyright holder can be contacted at gesslein@mathomatic.org, or
George Gesslein II, P.O. Box 224, Lansing, NY 14882-0224 USA.
*/
#include "includes.h"
#if WIN32_CONSOLE_COLORS
/* The WIN32_CONSOLE_COLORS code was contributed by Doug Snead for the MinGW C compiler. */
#include <windows.h>
#include <wincon.h>
#define FOREGROUND_BLACK 0
#define FOREGROUND_YELLOW (FOREGROUND_RED|FOREGROUND_GREEN)
#define FOREGROUND_MAGENTA (FOREGROUND_BLUE|FOREGROUND_RED)
#define FOREGROUND_CYAN (FOREGROUND_BLUE|FOREGROUND_GREEN)
#define FOREGROUND_WHITE (FOREGROUND_RED|FOREGROUND_GREEN|FOREGROUND_BLUE)
/* MS-Windows color array for coloring mathematical expressions, warnings, and errors. */
static short windows_carray[] = {
FOREGROUND_GREEN,
FOREGROUND_YELLOW, /* warning text color */
FOREGROUND_RED, /* error text color */
FOREGROUND_MAGENTA,
FOREGROUND_BLUE,
FOREGROUND_CYAN,
};
extern HANDLE hOut;
#endif
/* ANSI terminal color code array for 8 color ANSI; we don't use black or white */
/* because the background may be the same color, so there are only 6 colors here. */
static int carray[] = {
32, /* must be green (default color) */
33, /* must be yellow (for warnings) */
31, /* must be red (for errors) */
34, /* must be blue (for prompts) */
35, /* magenta */
36, /* cyan */
};
#define EQUATE_STRING " = " /* string displayed between the LHS and RHS of equations */
#define MODULUS_STRING " % " /* string displayed for the modulus operator */
static int flist_sub(token_type *p1, int n, int out_flag, char *string, int sbuffer_size, int pos, int *highp, int *lowp);
static int flist_recurse(token_type *p1, int n, int out_flag, char *string, int sbuffer_size, int line, int pos, int cur_level, int *highp, int *lowp);
/* Bright HTML color array. */
/* Used when HTML output and "set color" and "set bold" options are enabled. */
/* Good looking with a dark background. */
static char *bright_html_carray[] = {
"#00FF00", /* must be bright green (default color) */
"#FFFF00", /* must be bright yellow (for warnings) */
"#FF0000", /* must be bright red (for errors) */
"#0000FF", /* must be bright blue (for prompts) */
"#FF9000",
"#FF00FF",
"#00FFFF",
};
/* Dim HTML color array for color HTML output. */
/* Used for HTML output with "set color" and "set no bold" options. */
/* Good looking with a white background. */
static char *html_carray[] = {
"green",
"olive",
"red",
"navy",
"maroon",
"purple",
"teal",
};
/*
* Reset terminal attributes function.
* Turn color off if color mode is on.
* Subsequent output will have no color until the next call to set_color().
*/
void
reset_attr(void)
{
FILE *fp;
if (html_flag == 2) {
fp = gfp;
} else {
fp = stdout;
}
#if !LIBRARY
fflush(NULL); /* flush all output */
#endif
if (color_flag && cur_color >= 0) {
if (html_flag) {
fprintf(fp, "</font>");
} else {
#if WIN32_CONSOLE_COLORS
if (color_flag == 2) {
fprintf(fp, "\033[0m");
} else {
SetConsoleTextAttribute(hOut, FOREGROUND_WHITE);
}
#else
fprintf(fp, "\033[0m");
#endif
}
fflush(fp);
}
cur_color = -1;
}
/*
* Set the current color on the display.
* Subsequent output will have the color in carray[color % ARR_CNT(carray)] for ANSI color mode.
* Other color modes work similarly.
* Range for color is 0 to INT_MAX.
*
* Return actual color number displayed or -1 if no color.
*/
int
set_color(color)
int color;
{
int rv = -1;
if (html_flag != 2 && gfp != stdout) {
return rv;
}
if (color_flag) {
if (cur_color == color) /* color already set */
return rv;
if (html_flag) {
if (cur_color >= 0) {
fprintf(gfp, "</font>");
}
if (bold_colors) {
fprintf(gfp, "<font color=\"%s\">", bright_html_carray[rv = (color % ARR_CNT(bright_html_carray))]);
} else {
fprintf(gfp, "<font color=\"%s\">", html_carray[rv = (color % ARR_CNT(html_carray))]);
}
} else {
#if WIN32_CONSOLE_COLORS
if (color_flag == 2) {
fprintf(gfp, "\033[%d;%dm", bold_colors, carray[rv = (color % ARR_CNT(carray))]);
} else {
short attr = windows_carray[rv = (color % ARR_CNT(windows_carray))];
if (bold_colors)
attr |= FOREGROUND_INTENSITY;
SetConsoleTextAttribute(hOut, attr);
}
#else
fprintf(gfp, "\033[%d;%dm", bold_colors, carray[rv = (color % ARR_CNT(carray))]);
#endif
}
cur_color = color;
}
return rv;
}
/*
* Set normal text color for subsequent output.
*/
void
default_color(set_no_color_flag)
int set_no_color_flag; /* If true, set no color even if text_color is set. Normally this would be false. */
{
if (html_flag != 2 && gfp != stdout) {
return;
}
if (color_flag && cur_color >= 0) {
if (html_flag) {
fprintf(gfp, "</font>");
} else {
#if WIN32_CONSOLE_COLORS
if (color_flag == 2) {
fprintf(gfp, "\033[0m");
} else {
SetConsoleTextAttribute(hOut, FOREGROUND_WHITE);
}
#else
fprintf(gfp, "\033[0m");
#endif
}
}
cur_color = -1;
if (text_color >= 0 && !set_no_color_flag) {
set_color(text_color);
}
fflush(gfp);
}
/*
* Display all possible colors for this color mode.
*
* Return true if successful.
*/
int
display_all_colors(void)
{
int i, j;
i = 0;
default_color(true);
if (set_color(i) < 0) {
default_color(false);
return false;
}
do {
printf("#");
i++;
j = set_color(i);
} while (j > 0);
default_color(false);
return(j >= 0);
}
/*
* Trim the trailing zeros from a string, after the decimal point.
*/
static void
trim_zeros(buf)
char *buf;
{
int j;
j = strlen(buf) - 1;
for (; j >= 0; j--) {
if (buf[j] == '0')
continue;
if (buf[j] == '.') {
if (buf[j+1])
buf[j+2] = '\0';
} else {
break;
}
}
}
/*
* Display the expression or equation stored in equation space "n" in single-line format.
*
* Return length (number of screen columns) of output line.
*/
int
list1_sub(n, export_flag)
int n; /* equation space number */
int export_flag; /* non-zero for exportable format (readable by other math programs) */
/* 1 for Maxima, 2 for other, 3 for gnuplot, 4 for hexadecimal */
{
int len = 0;
if (empty_equation_space(n))
return 0;
if ((export_flag == 0 || export_flag == 4) && !high_prec) {
len += fprintf(gfp, "#%d: ", n + 1);
}
len += list_proc(lhs[n], n_lhs[n], export_flag);
if (n_rhs[n]) {
len += fprintf(gfp, EQUATE_STRING);
len += list_proc(rhs[n], n_rhs[n], export_flag);
}
if (export_flag == 1) {
len += fprintf(gfp, ";");
}
#if CYGWIN
fprintf(gfp, "\r\n"); /* might be redirecting to a Microsoft text file */
#else
fprintf(gfp, "\n");
#endif
return len;
}
/*
* Display the expression or equation stored in equation space "n".
*
* Return the total width of the output (number of screen columns)
* or zero on failure.
*/
int
list_sub(n)
int n; /* equation space number */
{
if (empty_equation_space(n))
return 0;
make_fractions_and_group(n);
if (factor_int_flag) {
factor_int_equation(n);
}
if (display2d) {
/* display in fraction format */
return flist_equation(n);
} else {
/* display in single-line format */
return list1_sub(n, false);
}
}
#if !SILENT
void
list_debug(level, p1, n1, p2, n2)
int level;
token_type *p1;
int n1;
token_type *p2;
int n2;
{
if (debug_level >= level) {
if (level >= -2) {
fprintf(gfp, _("level %d: "), level);
}
list_proc(p1, n1, false);
if (p2 && n2 > 0) {
fprintf(gfp, EQUATE_STRING);
list_proc(p2, n2, false);
}
fprintf(gfp, "\n");
}
}
#endif
/*
* Return the allocated string name of the given Mathomatic variable,
* or NULL if none.
*
* Does not return the actual variable name, use list_var() for that.
*/
char *
var_name(v)
long v; /* Mathomatic variable */
{
char *cp = NULL;
long l;
l = (labs(v) & VAR_MASK) - VAR_OFFSET;
if (l >= 0 && l < MAX_VAR_NAMES) {
cp = var_names[l];
}
return cp;
}
/*
* Convert the passed Mathomatic variable to an ASCII variable name.
* The ASCII variable name is stored in the global var_str[].
*
* Return the length of the variable name string in var_str[].
* Nothing is displayed.
*
* If (lang_code == 0), use standard Mathomatic format.
* If (lang_code > 0), make variable compatible with the language defined in the enumeration language_list defined in am.h
* If (lang_code < 0), create an exportable variable name: -1 for Maxima, -2 for other, -3 for gnuplot, -4 for hexadecimal,
* -5 for mathomatic-only variable format.
*/
int
list_var(v, lang_code)
long v; /* variable to convert */
int lang_code; /* language code */
{
int j;
int from_memory = false;
char *cp = NULL;
var_str[0] = '\0';
switch (labs(v) & VAR_MASK) {
case V_NULL:
return(strlen(var_str));
case SIGN:
cp = "sign";
break;
case IMAGINARY:
switch (lang_code) {
case -3:
cp = "{0,1}";
break;
case 0:
case -4:
case -2:
cp = "i";
break;
case -5:
cp = "i#";
break;
case -1:
cp = "%i";
break;
case PYTHON:
cp = "1j";
break;
default:
cp = "1.0i";
break;
}
break;
case V_E:
switch (lang_code) {
case -3:
cp = "exp(1.0)";
break;
case -1:
cp = "%e";
break;
case C:
cp ="M_E";
break;
case JAVA:
cp = "Math.E";
break;
case PYTHON:
cp = "math.e";
break;
case -5:
cp = "e#";
break;
default:
cp = "e";
break;
}
break;
case V_PI:
switch (lang_code) {
case -1:
cp = "%pi";
break;
case -5:
cp ="pi#";
break;
case C:
cp = "M_PI";
break;
case JAVA:
cp = "Math.PI";
break;
case PYTHON:
cp = "math.pi";
break;
default:
cp = "pi";
break;
}
break;
case MATCH_ANY:
cp = "all";
break;
default:
cp = var_name(v);
from_memory = true;
break;
}
if (cp) {
j = (labs(v) >> VAR_SHIFT) & SUBSCRIPT_MASK;
if (j) { /* for "sign" variables */
snprintf(var_str, sizeof(var_str), "%s%d", cp, j - 1);
} else {
my_strlcpy(var_str, cp, sizeof(var_str));
}
} else {
my_strlcpy(var_str, "bad_variable", sizeof(var_str));
}
/* Make valid C type variable if exporting or generating code: */
if (from_memory) {
switch (lang_code) {
case 0:
case -4:
case -5:
break;
default:
for (j = 0; var_str[j] && var_str[j] != '('; j++) {
if (strchr("_[]", var_str[j]) == NULL && !isalnum(var_str[j])) {
var_str[j] = '_';
}
}
break;
}
}
return(strlen(var_str));
}
/*
* Display an expression in single-line format.
* Use color if color mode is set.
*
* Return number of characters output (excluding escape sequences).
*/
int
list_proc(p1, n, export_flag)
token_type *p1; /* expression pointer */
int n; /* length of expression */
int export_flag; /* flag for exportable format (usually false) */
/* 1 for Maxima, 2 for other, 3 for gnuplot, 4 for hexadecimal */
{
return list_string_sub(p1, n, true, NULL, export_flag);
}
/*
* Store the expression from the specified equation space in a text string in single-line format.
* String should be freed with free() when done.
*
* Returns text string, or NULL if error.
*/
char *
list_equation(n, export_flag)
int n; /* equation space number */
int export_flag; /* flag for exportable format (usually false) */
{
int len;
char *cp;
if (empty_equation_space(n))
return NULL;
len = list_string(lhs[n], n_lhs[n], NULL, export_flag);
if (n_rhs[n]) {
len += strlen(EQUATE_STRING);
len += list_string(rhs[n], n_rhs[n], NULL, export_flag);
}
len += 2; /* for possible semicolon and terminating null character */
cp = (char *) malloc(len);
if (cp == NULL) {
error(_("Out of memory (can't malloc(3))."));
return NULL;
}
list_string(lhs[n], n_lhs[n], cp, export_flag);
if (n_rhs[n]) {
strcat(cp, EQUATE_STRING);
list_string(rhs[n], n_rhs[n], &cp[strlen(cp)], export_flag);
}
if (export_flag == 1) {
strcat(cp, ";");
}
return cp;
}
/*
* Store an expression in a text string.
* String should be freed with free() when done.
*
* Return string, or NULL if error.
*/
char *
list_expression(p1, n, export_flag)
token_type *p1; /* expression pointer */
int n; /* length of expression */
int export_flag;
{
int len;
char *cp;
if (n <= 0) {
return NULL;
}
len = list_string(p1, n, NULL, export_flag);
len++; /* for terminating null character */
cp = (char *) malloc(len);
if (cp == NULL) {
error(_("Out of memory (can't malloc(3))."));
return NULL;
}
list_string(p1, n, cp, export_flag);
return cp;
}
/*
* Convert an expression to a text string and store in "string" if
* "string" is not NULL. "string" need not be initialized,
* but must be long enough to contain the expression.
* To find the storage size needed, call with "string" set to NULL first.
*
* Return length (number of characters).
*/
int
list_string(p1, n, string, export_flag)
token_type *p1; /* expression pointer */
int n; /* length of expression */
char *string; /* buffer to save output to or NULL pointer */
int export_flag;
{
return list_string_sub(p1, n, false, string, export_flag);
}
#define APPEND(str) { if (string) { strcpy(&string[len], str); } if (outflag) { fprintf(gfp, "%s", str); } len += strlen(str); }
#define APPEND2(str) { if (string) { if ((sbuffer_size - current_len) > 0) my_strlcpy(&string[current_len], str, sbuffer_size - current_len); } else { fprintf(gfp, "%s", str); } current_len += strlen(str); }
int
list_string_sub(p1, n, outflag, string, export_flag)
token_type *p1; /* expression pointer */
int n; /* length of expression */
int outflag; /* if true, output to gfp */
char *string; /* buffer to save output to or NULL pointer */
int export_flag; /* flag for exportable format (usually false) */
/* 1 for Maxima, 2 for other, 3 for gnuplot, 4 for hexadecimal */
{
int i, j, k, i1;
int min1;
int cur_level;
char *cp;
int len = 0;
char buf[500], buf2[500];
int export_precision;
int cflag, power_flag;
cflag = (outflag && (export_flag == 0 || export_flag == 4));
if (cflag)
set_color(0);
if (string)
string[0] = '\0';
if (high_prec)
export_precision = 20;
else
export_precision = DBL_DIG;
cur_level = min1 = min_level(p1, n);
for (i = 0; i < n; i++) {
power_flag = false;
if (export_flag == 0 && !high_prec) {
for (j = i - 1; j <= (i + 1); j++) {
if ((j - 1) >= 0 && (j + 1) < n
&& p1[j].kind == OPERATOR && (p1[j].token.operatr == POWER || p1[j].token.operatr == FACTORIAL)
&& p1[j-1].level == p1[j].level
&& p1[j+1].level == p1[j].level
&& ((j + 2) >= n || p1[j+2].level != (p1[j].level - 1) || (p1[j+2].token.operatr < POWER))
&& ((j - 2) < 0 || p1[j-2].level != (p1[j].level - 1) || (p1[j-2].token.operatr < POWER))) {
power_flag = true;
break;
}
}
}
j = cur_level - p1[i].level;
if (power_flag)
k = abs(j) - 1;
else
k = abs(j);
for (i1 = 1; i1 <= k; i1++) {
if (j > 0) {
cur_level--;
APPEND(")");
if (cflag)
set_color(cur_level-min1);
} else {
cur_level++;
if (cflag)
set_color(cur_level-min1);
APPEND("(");
}
}
switch (p1[i].kind) {
case CONSTANT:
if (p1[i].token.constant == 0.0) {
p1[i].token.constant = 0.0; /* fix -0 */
}
if (export_flag == 4) {
snprintf(buf, sizeof(buf), "%a", p1[i].token.constant);
} else if (export_flag == 3) {
snprintf(buf, sizeof(buf), "%#.*g", DBL_DIG, p1[i].token.constant);
trim_zeros(buf);
} else if (export_flag || high_prec) {
snprintf(buf, sizeof(buf), "%.*g", export_precision, p1[i].token.constant);
} else if (finance_option >= 0) {
#if THOUSANDS_SEPARATOR /* Fails miserably in MinGW and possibly others, displaying nothing but the format string. */
snprintf(buf, sizeof(buf), "%'.*f", finance_option, p1[i].token.constant);
#else
snprintf(buf, sizeof(buf), "%.*f", finance_option, p1[i].token.constant);
#endif
} else {
if (p1[i].token.constant < 0.0 && (i + 1) < n && p1[i+1].level == p1[i].level
&& (p1[i+1].token.operatr >= POWER)) {
snprintf(buf, sizeof(buf), "(%.*g)", precision, p1[i].token.constant);
} else {
snprintf(buf, sizeof(buf), "%.*g", precision, p1[i].token.constant);
}
APPEND(buf);
break;
}
if (p1[i].token.constant < 0.0) {
snprintf(buf2, sizeof(buf2), "(%s)", buf);
APPEND(buf2);
} else {
APPEND(buf);
}
break;
case VARIABLE:
list_var(p1[i].token.variable, 0 - export_flag);
APPEND(var_str);
break;
case OPERATOR:
cp = _("(unknown operator)");
switch (p1[i].token.operatr) {
case PLUS:
cp = " + ";
break;
case MINUS:
cp = " - ";
break;
case TIMES:
cp = "*";
break;
case DIVIDE:
cp = "/";
break;
case IDIVIDE:
cp = "//";
break;
case MODULUS:
cp = MODULUS_STRING;
break;
case POWER:
if (power_starstar || export_flag == 3) {
cp = "**";
} else {
cp = "^";
}
break;
case FACTORIAL:
cp = "!";
i++;
break;
}
APPEND(cp);
break;
}
}
for (j = cur_level - min1; j > 0;) {
APPEND(")");
j--;
if (cflag)
set_color(j);
}
if (cflag)
default_color(false);
return len;
}
/*
* Return 1 (true) or -1 if expression is a valid integer expression for
* list_code().
* Return 0 if it is definitely a non-integer expression.
* Return -1 if it contains non-integer divide operators, but is OK otherwise.
*/
int
int_expr(p1, n)
token_type *p1; /* expression pointer */
int n; /* length of expression */
{
int i;
int rv = 1;
for (i = 0; i < n; i++) {
switch (p1[i].kind) {
case CONSTANT:
if (fmod(p1[i].token.constant, 1.0) != 0.0) {
return 0;
}
break;
case VARIABLE:
if (p1[i].token.variable < IMAGINARY) {
return 0;
}
break;
case OPERATOR:
if (p1[i].token.operatr == DIVIDE)
rv = -1;
break;
}
}
return rv;
}
/*
* Display an equation space as C, Java, or Python code.
*
* Return length of output (number of characters).
*/
int
list_code_equation(en, language, int_flag)
int en; /* equation space number */
enum language_list language;
int int_flag; /* integer arithmetic flag */
{
int len = 0;
if (empty_equation_space(en))
return 0;
len += list_code(lhs[en], &n_lhs[en], true, NULL, language, int_flag);
if (n_rhs[en]) {
len += fprintf(gfp, EQUATE_STRING);
len += list_code(rhs[en], &n_rhs[en], true, NULL, language, int_flag);
}
switch (language) {
case C:
case JAVA:
len += fprintf(gfp, ";");
break;
default:
break;
}
fprintf(gfp, "\n");
return len;
}
/*
* Convert the specified equation space to a string of C, Java, or Python code.
* String should be freed with free() when done.
*
* Return string, or NULL if error.
*/
char *
string_code_equation(en, language, int_flag)
int en; /* equation space number */
enum language_list language;
int int_flag; /* integer arithmetic flag */
{
int len;
char *cp;
if (empty_equation_space(en))
return NULL;
len = list_code(lhs[en], &n_lhs[en], false, NULL, language, int_flag);
if (n_rhs[en]) {
len += strlen(EQUATE_STRING);
len += list_code(rhs[en], &n_rhs[en], false, NULL, language, int_flag);
}
len += 2; /* for possible semicolon and terminating null character */
cp = (char *) malloc(len);
if (cp == NULL) {
error(_("Out of memory (can't malloc(3))."));
return NULL;
}
list_code(lhs[en], &n_lhs[en], false, cp, language, int_flag);
if (n_rhs[en]) {
strcat(cp, EQUATE_STRING);
list_code(rhs[en], &n_rhs[en], false, &cp[strlen(cp)], language, int_flag);
}
switch (language) {
case C:
case JAVA:
strcat(cp, ";");
break;
default:
break;
}
return cp;
}
/*
* Output C, Java, or Python code for an expression.
* Expression might be modified by this function, though it remains equivalent.
*
* Return length of output (number of characters).
*/
int
list_code(equation, np, outflag, string, language, int_flag)
token_type *equation; /* equation side pointer */
int *np; /* pointer to length of equation side */
int outflag; /* if true, output to gfp */
char *string; /* buffer to save output to or NULL pointer */
enum language_list language; /* see enumeration language_list in am.h */
int int_flag; /* integer arithmetic flag, should work with any language */
{
int i, j, k, i1, i2;
int min1;
int cur_level;
char *cp;
char buf[500], buf2[500];
int len = 0;
if (string)
string[0] = '\0';
min1 = min_level(equation, *np);
if (*np > 1)
min1--;
cur_level = min1;
for (i = 0; i < *np; i++) {
j = cur_level - equation[i].level;
k = abs(j);
for (i1 = 1; i1 <= k; i1++) {
if (j > 0) {
cur_level--;
APPEND(")");
} else {
cur_level++;
for (i2 = i + 1; i2 < *np && equation[i2].level >= cur_level; i2 += 2) {
if (equation[i2].level == cur_level) {
switch (equation[i2].token.operatr) {
case POWER:
if (equation[i2-1].level == cur_level
&& equation[i2+1].level == cur_level
&& equation[i2+1].kind == CONSTANT
&& equation[i2+1].token.constant == 2.0) {
equation[i2].token.operatr = TIMES;
equation[i2+1] = equation[i2-1];
} else {
if (!int_flag) {
switch (language) {
case C:
APPEND("pow");
break;
case JAVA:
APPEND("Math.pow");
break;
default:
break;
}
}
}
break;
case FACTORIAL:
APPEND("factorial");
break;
}
break;
}
}
APPEND("(");
}
}
switch (equation[i].kind) {
case CONSTANT:
if (equation[i].token.constant == 0.0) {
equation[i].token.constant = 0.0; /* fix -0 */
}
if (int_flag) {
snprintf(buf, sizeof(buf), "%.0f", equation[i].token.constant);
} else {
snprintf(buf, sizeof(buf), "%#.*g", DBL_DIG, equation[i].token.constant);
trim_zeros(buf);
}
/* Here we will need to parenthesize negative numbers to make -2**x work the same with Python: */
if (equation[i].token.constant < 0) {
snprintf(buf2, sizeof(buf2), "(%s)", buf);
APPEND(buf2);
} else {
APPEND(buf);
}
break;
case VARIABLE:
if (int_flag && (language == C || language == JAVA) && equation[i].token.variable == IMAGINARY) {
APPEND("1i");
} else {
list_var(equation[i].token.variable, language);
APPEND(var_str);
}
break;
case OPERATOR:
cp = _("(unknown operator)");
switch (equation[i].token.operatr) {
case PLUS:
cp = " + ";
break;
case MINUS:
cp = " - ";
break;
case TIMES:
cp = "*";
break;
case IDIVIDE:
if (language == PYTHON) {
cp = "//";
break;
}
case DIVIDE:
cp = "/";
break;
case MODULUS:
cp = MODULUS_STRING;
break;
case POWER:
if (int_flag || language == PYTHON) {
cp = "**";
} else {
cp = ", ";
}
break;
case FACTORIAL:
cp = "";
i++;
break;
}
APPEND(cp);
break;
}
}
for (j = cur_level - min1; j > 0; j--) {
APPEND(")");
}