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/* GNUPLOT - command.c */

/*[

* Permission to use, copy, and distribute this software and its

* documentation for any purpose with or without fee is hereby granted,

* provided that the above copyright notice appear in all copies and

* that both that copyright notice and this permission notice appear

* in supporting documentation.

* Permission to modify the software is granted, but not the right to

* distribute the complete modified source code. Modifications are to

* be distributed as patches to the released version. Permission to

* distribute binaries produced by compiling modified sources is granted,

* provided you

* 1. distribute the corresponding source modifications from the

* released version in the form of a patch file along with the binaries,

* 2. add special version identification to distinguish your version

* in addition to the base release version number,

* 3. provide your name and address as the primary contact for the

* support of your modified version, and

* 4. retain our contact information in regard to use of the base

* software.

* Permission to distribute the released version of the source code along

* with corresponding source modifications in the form of a patch file is

* granted with same provisions 2 through 4 for binary distributions.

* This software is provided "as is" without express or implied warranty

* to the extent permitted by applicable law.

]*/

* Changes:

* 19 September 1992 Lawrence Crowl (crowl@cs.orst.edu)

* Added user-specified bases for log scaling.

* April 1999 Franz Bakan (bakan@ukezyk.desy.de)

* Added code to support mouse-input from OS/2 PM window

* Changes marked by USE_MOUSE

* May 1999, update by Petr Mikulik

* Use gnuplot's pid in shared mem name

* August 1999 Franz Bakan and Petr Mikulik

* Encapsulating read_line into a thread, acting on input when thread or

* gnupmdrv posts an event semaphore. Thus mousing works even when gnuplot

* is used as a plotting device (commands passed via pipe).

* May 2011 Ethan A Merritt

* Introduce block structure defined by { ... }, which may span multiple lines.

* In order to have the entire block available at one time we now count

* +/- curly brackets during input and keep extending the current input line

* until the net count is zero. This is done in do_line() for interactive

* input, and load_file() for non-interactive input.

#include "command.h"

#include "axis.h"

#include "alloc.h"

#include "datablock.h"

#include "eval.h"

#include "fit.h"

#include "datafile.h"

#include "getcolor.h"

#include "gp_hist.h"

#include "gplocale.h"

#include "loadpath.h"

#include "misc.h"

#include "parse.h"

#include "plot.h"

#include "plot2d.h"

#include "plot3d.h"

#include "readline.h"

#include "save.h"

#include "scanner.h"

#include "setshow.h"

#include "stats.h"

#include "tables.h"

#include "term_api.h"

#include "util.h"

#include "voxelgrid.h"

#include "external.h"

#ifdef USE_MOUSE

# include "mouse.h"

int paused_for_mouse = 0;

#endif

#define PROMPT "gnuplot> "

#ifdef OS2_IPC

# define INCL_DOSMEMMGR

# define INCL_DOSPROCESS

# define INCL_DOSSEMAPHORES

# include <os2.h>

static char *input_line_SharedMem = NULL; /* pointer to the shared memory for mouse messages */

static HEV semInputReady = 0; /* mouse event semaphore */

static HEV semPause = 0; /* pause event semaphore */

static TBOOLEAN thread_rl_Running = FALSE; /* running status */

static int thread_rl_RetCode = -1; /* return code from readline input thread */

static int thread_pause_RetCode = -1; /* return code from pause input thread */

static TBOOLEAN pause_internal; /* flag to indicate not to use a dialog box */

#endif /* OS2_IPC */

#ifndef _WIN32

# include "help.h"

#endif

#ifdef _WIN32

# define WIN32_LEAN_AND_MEAN

# include <windows.h>

# ifdef _MSC_VER

# include <malloc.h>

# include <direct.h> /* getcwd() */

# else

# include <alloc.h>

# endif

# include <htmlhelp.h>

# include "win/winmain.h"

#endif /* _WIN32 */

#ifdef __DJGPP__

# include <pc.h> /* getkey() */

# define useconds_t unsigned

#endif

#ifdef __WATCOMC__

# include <conio.h> /* for getch() */

#endif

typedef enum ifstate {IF_INITIAL=1, IF_TRUE, IF_FALSE} ifstate;

/* static prototypes */

static void command(void);

static TBOOLEAN is_array_assignment(void);

static int changedir(char *path);

static char* fgets_ipc(char* dest, int len);

static char* gp_get_string(char *, size_t, const char *);

static int read_line(const char *prompt, int start);

static void do_system(const char *);

static void test_palette_subcommand(void);

static int find_clause(int *, int *);

static void if_else_command(ifstate if_state);

static void old_if_command(struct at_type *expr);

static int report_error(int ierr);

static void load_or_call_command( TBOOLEAN call );

void do_shell(void);

static int expand_1level_macros(void);

struct lexical_unit *token;

int token_table_size;

char *gp_input_line;

size_t gp_input_line_len;

int inline_num; /* input line number */

/* Points to structure holding dummy parameter values

* to be used during function evaluation

struct udft_entry *dummy_func;

/* support for replot command */

char *replot_line = NULL;

int plot_token = 0; /* start of 'plot' command */

/* flag to disable `replot` when some data are sent through stdin;

* used by mouse/hotkey capable terminals

TBOOLEAN replot_disabled = FALSE;

/* flag to show we are inside a plot/splot/replot/refresh/stats

* command and therefore should not allow starting another one

* e.g. from a function block

TBOOLEAN inside_plot_command = FALSE;

/* output file for the print command */

FILE *print_out = NULL;

struct udvt_entry *print_out_var = NULL;

char *print_out_name = NULL;

char *print_sep = NULL;

/* input data, parsing variables */

int num_tokens, c_token;

TBOOLEAN if_open_for_else = FALSE;

static int clause_depth = 0;

/* support for 'break' and 'continue' commands */

static int iteration_depth = 0;

static TBOOLEAN requested_break = FALSE;

static TBOOLEAN requested_continue = FALSE;

/* set when an "exit" command is encountered */

static int command_exit_requested = 0;

/* support for dynamic size of input line */

void

extend_input_line()

{

if (gp_input_line_len == 0) {

/* first time */

gp_input_line = gp_alloc(MAX_LINE_LEN, "gp_input_line");

gp_input_line_len = MAX_LINE_LEN;

gp_input_line[0] = NUL;

} else {

gp_input_line = gp_realloc(gp_input_line, gp_input_line_len + MAX_LINE_LEN,

"extend input line");

gp_input_line_len += MAX_LINE_LEN;

FPRINTF((stderr, "extending input line to %d chars\n",

gp_input_line_len));

}

/* constant by which token table grows */

#define MAX_TOKENS 400

void

extend_token_table()

{

if (token_table_size == 0) {

/* first time */

token = (struct lexical_unit *) gp_alloc(MAX_TOKENS * sizeof(struct lexical_unit), "token table");

token_table_size = MAX_TOKENS;

/* HBB: for checker-runs: */

memset(token, 0, MAX_TOKENS * sizeof(*token));

} else {

token = gp_realloc(token, (token_table_size + MAX_TOKENS) * sizeof(struct lexical_unit), "extend token table");

memset(token+token_table_size, 0, MAX_TOKENS * sizeof(*token));

token_table_size += MAX_TOKENS;

FPRINTF((stderr, "extending token table to %d elements\n", token_table_size));

}

#ifdef OS2_IPC

void

thread_read_line(void *arg)

{

(void) arg;

thread_rl_Running = TRUE;

thread_rl_RetCode = read_line(PROMPT, 0);

thread_rl_Running = FALSE;

DosPostEventSem(semInputReady);

}

void

thread_pause(void *arg)

{

int rc = 2;

if (!pause_internal)

rc = PM_pause(arg != NULL ? arg : "paused");

if (rc == 2) {

/* rc==2: no dialog, listen to stdin */

int junk;

if (arg != NULL) fputs(arg, stderr);

do {

junk = fgetc(stdin);

} while (junk != EOF && junk != '\r' && junk != '\n');

thread_pause_RetCode = (junk == EOF) ? 0 : 1;

} if (rc == 3) {

/* dialog/menu active, wait for event semaphore */

ULONG u;

DosResetEventSem(semPause, &u);

DosWaitEventSem(semPause, SEM_INDEFINITE_WAIT);

/* now query result */

thread_pause_RetCode = PM_pause(NULL);

} else {

/* rc==1: OK; rc==0: cancel */

thread_pause_RetCode = rc;

}

DosPostEventSem(semInputReady);

}

void

os2_ipc_setup(void)

{

APIRET rc;

char name[40];

/* create input event semaphore */

sprintf(name, "\\SEM32\\GP%i_Input_Ready", getpid());

rc = DosCreateEventSem(name, &semInputReady, 0, 0);

if (rc != 0)

fputs("DosCreateEventSem error\n", stderr);

/* create pause event semaphore */

sprintf(name, "\\SEM32\\GP%i_Pause_Ready", getpid());

rc = DosCreateEventSem(name, &semPause, 0, 0);

if (rc != 0)

fputs("DosCreateEventSem error\n", stderr);

/* allocate shared memory */

sprintf(name, "\\SHAREMEM\\GP%i_Mouse_Input", getpid());

rc = DosAllocSharedMem((PPVOID) &input_line_SharedMem,

name, MAX_LINE_LEN,

PAG_READ | PAG_WRITE | PAG_COMMIT);

if (rc != 0)

fputs("DosAllocSharedMem ERROR\n", stderr);

else

*input_line_SharedMem = 0;

}

int

os2_ipc_dispatch_event(void)

{

if (input_line_SharedMem == NULL || !*input_line_SharedMem)

return 0;

if (*input_line_SharedMem == '%') {

struct gp_event_t ge;

/* copy event data immediately */

memcpy(&ge, input_line_SharedMem + 1, sizeof(ge));

*input_line_SharedMem = 0; /* discard the event data */

thread_rl_RetCode = 0;

/* process event */

do_event(&ge);

/* end pause mouse? */

if ((ge.type == GE_buttonrelease) && (paused_for_mouse & PAUSE_CLICK) &&

(((ge.par1 == 1) && (paused_for_mouse & PAUSE_BUTTON1)) ||

((ge.par1 == 2) && (paused_for_mouse & PAUSE_BUTTON2)) ||

((ge.par1 == 3) && (paused_for_mouse & PAUSE_BUTTON3)))) {

paused_for_mouse = 0;

}

if ((ge.type == GE_keypress) && (paused_for_mouse & PAUSE_KEYSTROKE) &&

(ge.par1 != NUL)) {

paused_for_mouse = 0;

}

return 0;

}

if (*input_line_SharedMem &&

strstr(input_line_SharedMem, "plot") != NULL &&

(strcmp(term->name, "pm") != 0 && strcmp(term->name, "x11") != 0)) {

/* avoid plotting if terminal is not PM or X11 */

fprintf(stderr, "\n\tCommand(s) ignored for other than PM and X11 terminals\a\n");

if (interactive)

fputs(PROMPT, stderr);

*input_line_SharedMem = 0; /* discard the event data */

return 0;

}

strcpy(gp_input_line, input_line_SharedMem);

input_line_SharedMem[0] = 0;

thread_rl_RetCode = 0;

return 1;

}

int

os2_ipc_waitforinput(int mode)

{

ULONG u;

if (mode == TERM_ONLY_CHECK_MOUSING) {

if (semInputReady == 0)

return 0;

if (DosWaitEventSem(semInputReady, SEM_IMMEDIATE_RETURN) == 0) {

os2_ipc_dispatch_event();

DosResetEventSem(semInputReady, &u);

}

return 0;

}

#endif /* OS2_IPC */

int

com_line()

{

if (multiplot) {

/* calls int_error() if it is not happy */

term_check_multiplot_okay(interactive);

if (read_line("multiplot> ", 0))

return (1);

} else {

#if defined(OS2_IPC) && defined(USE_MOUSE)

ULONG u;

if (!thread_rl_Running) {

int res = _beginthread(thread_read_line, NULL, 32768, NULL);

if (res == -1)

fputs("error command.c could not begin thread\n", stderr);

}

/* wait until a line is read or gnupmdrv makes shared mem available */

DosWaitEventSem(semInputReady, SEM_INDEFINITE_WAIT);

DosResetEventSem(semInputReady, &u);

if (thread_rl_Running) {

/* input thread still running, this must be a "mouse" event */

if (os2_ipc_dispatch_event() == 0)

return 0;

}

if (thread_rl_RetCode)

return 1;

#else /* The normal case */

if (read_line(PROMPT, 0))

return 1;

#endif /* defined(OS2_IPC) && defined(USE_MOUSE) */

}

/* So we can flag any new output: if false at time of error,

* we reprint the command line before printing caret.

* TRUE for interactive terminals, since the command line is typed.

* FALSE for non-terminal stdin, so command line is printed anyway.

* (DFK 11/89)

screen_ok = interactive;

if (do_line())

return (1);

else

return (0);

}

int

do_line()

{

/* Line continuation has already been handled by read_line().

* Expand any string variables in the current input line.

string_expand_macros();

/* Remove leading whitespace */

{

char *inlptr = gp_input_line;

while (isspace((unsigned char) *inlptr))

inlptr++;

if (inlptr != gp_input_line) {

memmove(gp_input_line, inlptr, strlen(inlptr));

gp_input_line[strlen(inlptr)] = NUL;

}

/* Leading '!' indicates a shell command that bypasses normal gnuplot

* tokenization and parsing.

* This doesn't work inside a bracketed clause or in a function block.

if (is_system(*gp_input_line)) {

if (evaluate_inside_functionblock)

int_error(NO_CARET, "bare shell commands not accepted in a function block");

do_system(gp_input_line + 1);

return (0);

}

/* Strip off trailing comment */

if (strchr(gp_input_line, '#')) {

num_tokens = scanner(&gp_input_line, &gp_input_line_len);

if (gp_input_line[token[num_tokens].start_index] == '#')

gp_input_line[token[num_tokens].start_index] = NUL;

}

num_tokens = scanner(&gp_input_line, &gp_input_line_len);

* Expand line if necessary to contain a complete bracketed clause {...}

* Insert a ';' after current line and append the next input line.

* NB: This may leave an "else" condition on the next line.

if (curly_brace_count < 0)

int_error(NO_CARET,"Unexpected }");

while (curly_brace_count > 0) {

if (lf_head && lf_head->depth > 0) {

/* This catches the case that we are inside a "load foo" operation

* and therefore requesting interactive input is not an option.

int_error(NO_CARET, "Syntax error: missing block terminator }");

}

else if (interactive || noinputfiles) {

/* If we are really in interactive mode and there are unterminated blocks,

* then we want to display a "more>" prompt to get the rest of the block.

* However, there are two more cases that must be dealt here:

* One is when commands are piped to gnuplot - on the command line,

* the other is when commands are piped to gnuplot which is opened

* as a slave process. The test for noinputfiles is for the latter case.

* If we didn't have that test here, unterminated blocks sent via a pipe

* would trigger the error message in the else branch below. */

int retval;

strcat(gp_input_line,";");

retval = read_line("more> ", strlen(gp_input_line));

if (retval)

int_error(NO_CARET, "Syntax error: missing block terminator }");

/* Expand any string variables in the current input line */

string_expand_macros();

num_tokens = scanner(&gp_input_line, &gp_input_line_len);

if (gp_input_line[token[num_tokens].start_index] == '#')

gp_input_line[token[num_tokens].start_index] = NUL;

}

else {

/* Non-interactive mode here means that we got a string from -e.

* Having curly_brace_count > 0 means that there are at least one

* unterminated blocks in the string.

* Likely user error, so we die with an error message. */

int_error(NO_CARET, "Syntax error: missing block terminator }");

}

c_token = 0;

while (c_token < num_tokens) {

command();

if (command_exit_requested) {

command_exit_requested = 0; /* yes this is necessary */

return 1;

}

if (iteration_early_exit()) {

c_token = num_tokens;

break;

}

if (c_token < num_tokens) { /* something after command */

if (equals(c_token, ";")) {

c_token++;

} else if (equals(c_token, "{")) {

begin_clause();

} else if (equals(c_token, "}")) {

end_clause();

} else

int_error(c_token, "unexpected or unrecognized token: %s",

token_to_string(c_token));

}

/* This check allows event handling inside load/eval/while statements */

check_for_mouse_events();

return (0);

}

void

do_string(const char *s)

{

char *cmdline = gp_strdup(s);

do_string_and_free(cmdline);

}

void

do_string_and_free(char *cmdline)

{

#ifdef USE_MOUSE

if (display_ipc_commands())

fprintf(stderr, "%s\n", cmdline);

#endif

lf_push(NULL, NULL, cmdline); /* save state for errors and recursion */

while (gp_input_line_len < strlen(cmdline) + 1)

extend_input_line();

strcpy(gp_input_line, cmdline);

screen_ok = FALSE;

command_exit_requested = do_line();

/* "exit" is supposed to take us out of the current file from a

* "load <file>" command. But the LFS stack holds both files and

* bracketed clauses, so we have to keep popping until we hit an

* actual file.

if (command_exit_requested) {

while (lf_head && !lf_head->name) {

FPRINTF((stderr,"pop one level of non-file LFS\n"));

lf_pop();

}

} else

lf_pop();

}

#ifdef USE_MOUSE

void

toggle_display_of_ipc_commands()

{

if (mouse_setting.verbose)

mouse_setting.verbose = 0;

else

mouse_setting.verbose = 1;

}

int

display_ipc_commands()

{

return mouse_setting.verbose;

}

void

do_string_replot(const char *s)

{

do_string(s);

if (volatile_data && (E_REFRESH_NOT_OK != refresh_ok)) {

if (display_ipc_commands())

fprintf(stderr, "refresh\n");

refresh_request();

} else if (!replot_disabled)

replotrequest();

else

int_warn(NO_CARET, "refresh not possible and replot is disabled");

}

void

restore_prompt()

{

if (interactive) {

#if defined(HAVE_LIBREADLINE) || defined(HAVE_LIBEDITLINE)

# if !defined(MISSING_RL_FORCED_UPDATE_DISPLAY)

rl_forced_update_display();

# else

rl_redisplay();

# endif

#else

fputs(PROMPT, stderr);

fflush(stderr);

#endif

}

#endif /* USE_MOUSE */

void

define()

{

int start_token; /* the 1st token in the function definition */

struct udvt_entry *udv;

struct udft_entry *udf;

struct value result;

if (equals(c_token + 1, "(")) {

/* function ! */

int dummy_num = 0;

struct at_type *at_tmp;

char *tmpnam;

char save_dummy[MAX_NUM_VAR][MAX_ID_LEN+1];

memcpy(save_dummy, c_dummy_var, sizeof(save_dummy));

start_token = c_token;

do {

c_token += 2; /* skip to the next dummy */

copy_str(c_dummy_var[dummy_num++], c_token, MAX_ID_LEN);

} while (equals(c_token + 1, ",") && (dummy_num < MAX_NUM_VAR));

if (equals(c_token + 1, ","))

int_error(c_token + 2, "function contains too many parameters");

c_token += 3; /* skip (, dummy, ) and = */

if (END_OF_COMMAND)

int_error(c_token, "function definition expected");

udf = dummy_func = add_udf(start_token);

udf->dummy_num = dummy_num;

if ((at_tmp = perm_at()) == (struct at_type *) NULL)

int_error(start_token, "not enough memory for function");

if (udf->at) /* already a dynamic a.t. there */

free_at(udf->at); /* so free it first */

udf->at = at_tmp; /* before re-assigning it. */

memcpy(c_dummy_var, save_dummy, sizeof(save_dummy));

m_capture(&(udf->definition), start_token, c_token - 1);

dummy_func = NULL; /* dont let anyone else use our workspace */

/* Save function definition in a user-accessible variable */

tmpnam = gp_alloc(8+strlen(udf->udf_name), "varname");

strcpy(tmpnam, "GPFUN_");

strcat(tmpnam, udf->udf_name);

fill_gpval_string(tmpnam, udf->definition);

free(tmpnam);

} else {

/* variable ! */

char *varname = gp_input_line + token[c_token].start_index;

if (!strncmp(varname, "GPVAL_", 6)

|| !strncmp(varname, "GPFUN_", 6)

|| !strncmp(varname, "MOUSE_", 6))

int_error(c_token, "Cannot set internal variables GPVAL_ GPFUN_ MOUSE_");

start_token = c_token;

c_token += 2;

const_express(&result);

/* Special handling needed to safely return an array */

if (result.type == ARRAY)

make_array_permanent(&result);

/* If the variable name was previously in use then depending on its

* old type it may have attached memory that needs to be freed.

* Note: supposedly the old variable type cannot be datablock because

* the syntax $name = foo is not accepted so we would not be here.

* However, weird cases like FOO = value($datablock) violate this rule

* and leave FOO as a datablock whose name does not start with $.

udv = add_udv(start_token);

free_value(&udv->udv_value);

udv->udv_value = result;

}

void

undefine_command()

{

char key[MAX_ID_LEN+1];

TBOOLEAN wildcard;

c_token++; /* consume the command name */

while (!END_OF_COMMAND) {

/* copy next var name into key */

copy_str(key, c_token, MAX_ID_LEN);

/* Peek ahead - must do this, because a '*' is returned as a

separate token, not as part of the 'key' */

wildcard = equals(c_token+1,"*");

if (wildcard)

c_token++;

/* The '$' starting a data block name is a separate token */

else if (*key == '$')

copy_str(&key[1], ++c_token, MAX_ID_LEN-1);

/* Other strange stuff on command line */

else if (!isletter(c_token))

int_error(c_token, "Not a variable name");

/* This command cannot deal with array elements or functions */

if (equals(c_token+1, "[") || equals(c_token+1, "("))

int_error(c_token, "Cannot undefine function or array element");

/* ignore internal variables */

if (strncmp(key, "GPVAL_", 6) && strncmp(key, "MOUSE_", 6))

del_udv_by_name( key, wildcard );

c_token++;

}

static void

command()

{

int i;

for (i = 0; i < MAX_NUM_VAR; i++)

c_dummy_var[i][0] = NUL; /* no dummy variables */

if (is_definition(c_token))

define();

else if (is_array_assignment())

;

else

(*lookup_ftable(&command_ftbl[0],c_token))();

return;

}

/* process the 'raise' or 'lower' command */

void

raise_lower_command(int lower)

{

++c_token;

if (END_OF_COMMAND) {

if (lower) {

#ifdef OS2

pm_lower_terminal_window();

#endif

#ifdef X11

x11_lower_terminal_group();

#endif

#ifdef _WIN32

win_lower_terminal_group();

#endif

#ifdef WXWIDGETS

wxt_lower_terminal_group();

#endif

} else {

#ifdef OS2

pm_raise_terminal_window();

#endif

#ifdef X11

x11_raise_terminal_group();

#endif

#ifdef _WIN32

win_raise_terminal_group();

#endif

#ifdef WXWIDGETS

wxt_raise_terminal_group();

#endif

}

return;

} else {

int number;

int negative = equals(c_token, "-");

if (negative || equals(c_token, "+")) c_token++;

if (!END_OF_COMMAND && isanumber(c_token)) {

number = real_expression();

if (negative)

number = -number;

if (lower) {

#ifdef OS2

pm_lower_terminal_window();

#endif

#ifdef X11

x11_lower_terminal_window(number);

#endif

#ifdef _WIN32

win_lower_terminal_window(number);

#endif

#ifdef WXWIDGETS

wxt_lower_terminal_window(number);

#endif

} else {

#ifdef OS2

pm_raise_terminal_window();

#endif

#ifdef X11

x11_raise_terminal_window(number);

#endif

#ifdef _WIN32

win_raise_terminal_window(number);

#endif

#ifdef WXWIDGETS

wxt_raise_terminal_window(number);

#endif

}

++c_token;

return;

}

if (lower)

int_error(c_token, "usage: lower {plot_id}");

else

int_error(c_token, "usage: raise {plot_id}");

}

void

raise_command(void)

{

raise_lower_command(0);

}

void

lower_command(void)

{

raise_lower_command(1);

}

* Arrays are declared using the syntax

* array A[size] { = [ element, element, ... ] }

* array A = [ .., .. ]

* array A = <expression> (only valid if <expression> returns an array)

* where size is an integer and space is reserved for elements A[1] through A[size]

* The size itself is stored in A[0].v.int_val.A

* The list of initial values is optional.

* Any element that is not initialized is set to NOTDEFINED.

* Elements in an existing array can be accessed like any other gnuplot variable.

* Each element can be one of INTGR, CMPLX, STRING.

void

array_command()

{

int nsize = 0; /* Size of array when we leave */

int est_size = 0; /* Estimated size */

TBOOLEAN empty_array = FALSE;

struct udvt_entry *array;

struct value *A;

int i;

/* Create or recycle a udv containing an array with the requested name */

if (!isletter(++c_token))

int_error(c_token, "illegal variable name");

array = add_udv(c_token++);

if (equals(c_token, "[")) {

c_token++;

nsize = int_expression();

if (!equals(c_token++,"]"))

int_error(c_token-1, "expecting array[size>0]");

} else if (equals(c_token, "=") && equals(c_token+1, "[")) {

if (equals(c_token+2,"]"))

empty_array = TRUE;

/* Estimate size of array by counting commas in the initializer */

for ( i = c_token+2; i < num_tokens; i++) {

if (equals(i,",") || equals(i,"]"))

est_size++;

if (equals(i,"]"))

break;

}

nsize = est_size;

} else if (equals(c_token, "=")) {

/* array A = <expression> */

struct value a;

int save_token = ++c_token;

const_express(&a);

if (a.type != ARRAY) {

free_value(&a);

int_error(save_token, "not an array expression");

}

make_array_permanent(&a);

array->udv_value = a;

return;

}

if (nsize > 0)

init_array(array, nsize);

else

int_error(c_token-1, "expecting array[size>0]");

/* Element zero can also hold an indicator that this is a colormap */

A = array->udv_value.v.value_array;

if (equals(c_token, "colormap")) {

c_token++;

if (nsize >= 2) /* Need at least 2 entries to calculate range */

A[0].type = COLORMAP_ARRAY;

}

/* Initializer syntax: array A[10] = [x,y,z,,"foo",] */

if (equals(c_token, "=") && equals(c_token+1, "[")) {

int initializers = 0;

c_token += 2;

for (i = 1; i <= nsize; i++) {

if (equals(c_token, "]"))

break;

if (equals(c_token, ",")) {

initializers++;

c_token++;

continue;

}

const_express(&A[i]);

if (A[i].type == ARRAY) {

if (A[i].v.value_array[0].type == TEMP_ARRAY)

gpfree_array(&(A[i]));

A[i].type = NOTDEFINED;

int_error(c_token, "Cannot nest arrays");

}

initializers++;

if (equals(c_token, "]"))

break;

if (equals(c_token, ","))

c_token++;

else

int_error(c_token, "expecting Array[size] = [x,y,...]");

}

c_token++;

/* If the size is determined by the number of initializers */

if (empty_array)

A[0].v.int_val = 0;

else if (A[0].v.int_val == 0)

A[0].v.int_val = initializers;

}

return;

}

* Check for command line beginning with

* Array[<expr>] = <expr>

* This routine is modeled on command.c:define()

TBOOLEAN

is_array_assignment()

{

udvt_entry *udv;

struct value newvalue;

int index;

TBOOLEAN looks_OK = FALSE;

int brackets;

if (!isletter(c_token) || !equals(c_token+1, "["))

return FALSE;

/* There are other legal commands where the 2nd token is [

* e.g. "plot [min:max] foo"

* so we check that the closing ] is immediately followed by =.

for (index=c_token+2, brackets=1; index < num_tokens; index++) {

if (equals(index,";"))

return FALSE;

if (equals(index,"["))

brackets++;

if (equals(index,"]"))

brackets--;

if (brackets == 0) {

if (!equals(index+1,"="))

return FALSE;

looks_OK = TRUE;

break;

}

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gnuplot/src/command.c at master · gnuplot/gnuplot · GitHub

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