/*
   +----------------------------------------------------------------------+
   | PHP Version 5                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2014 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Felipe Pena <felipe@php.net>                                |
   | Authors: Joe Watkins <joe.watkins@live.co.uk>                        |
   | Authors: Bob Weinand <bwoebi@php.net>                                |
   | Authors: Terry Ellison <terry@ellisons.org.uk>                       |
   +----------------------------------------------------------------------+
*/

#include "phpdbg.h"
#include "phpdbg_help.h"
#include "phpdbg_prompt.h"
#include "zend.h"

ZEND_EXTERN_MODULE_GLOBALS(phpdbg);

/* {{{ Commands Table */
#define PHPDBG_COMMAND_HELP_D(name, tip, alias, action) \
	{PHPDBG_STRL(#name), tip, sizeof(tip)-1, alias, action, NULL, 0}

const phpdbg_command_t phpdbg_help_commands[] = {
	PHPDBG_COMMAND_HELP_D(aliases,    "show alias list", 'a', phpdbg_do_help_aliases),
	PHPDBG_COMMAND_HELP_D(options,    "command line options", 0, NULL),
	PHPDBG_COMMAND_HELP_D(overview,   "help overview", 0, NULL),
	PHPDBG_COMMAND_HELP_D(phpdbginit, "phpdbginit file format", 0, NULL),
	PHPDBG_COMMAND_HELP_D(syntax,     "syntax overview", 0, NULL),
	PHPDBG_END_COMMAND
};  /* }}} */

/* {{{ pretty_print.  Formatting escapes and wrapping text in a string before printing it. */
void pretty_print(char *text TSRMLS_DC)
{
	char *new, *p, *q;

	const char  *prompt_escape = phpdbg_get_prompt(TSRMLS_C);
	unsigned int prompt_escape_len = strlen(prompt_escape);
	unsigned int prompt_len = strlen(PHPDBG_G(prompt)[0]);

	const char  *bold_on_escape  = PHPDBG_G(flags) & PHPDBG_IS_COLOURED ? "\033[1m" : "";
	const char  *bold_off_escape = PHPDBG_G(flags) & PHPDBG_IS_COLOURED ? "\033[0m" : "";
	unsigned int bold_escape_len = strlen(bold_on_escape);

	unsigned int term_width = phpdbg_get_terminal_width(TSRMLS_C);
	unsigned int size = 0;

	int in_bold = 0;

	char *last_new_blank = NULL;          /* position in new buffer of last blank char */
	unsigned int last_blank_count = 0;    /* printable char offset of last blank char */
	unsigned int line_count = 0;          /* number printable chars on current line */

	if (PHPDBG_G(flags) & PHPDBG_WRITE_XML) {
		phpdbg_xml("<help msg=\"%s\" />", text);
		return;
	}

	/* First pass calculates a safe size for the pretty print version */
	for (p = text; *p; p++) {
		if (UNEXPECTED(p[0] == '*') && p[1] == '*') {
			size += bold_escape_len - 2;
			p++;
		} else if (UNEXPECTED(p[0] == '$') && p[1] == 'P') {
			size += prompt_escape_len - 2;
			p++;
		} else if (UNEXPECTED(p[0] == '\\')) {
			p++;
		}
	}
	size += (p-text)+1;

	new = emalloc(size);
	/*
	 * Second pass substitutes the bold and prompt escape sequences and line wrap
	 *
	 * ** toggles bold on and off if PHPDBG_IS_COLOURED flag is set
	 * $P substitutes the prompt sequence
	 * Lines are wrapped by replacing the last blank with a CR before <term width>
	 * characters.  (This defaults to 100 if the width can't be detected).  In the
	 * pathelogical case where no blanks are found, then the wrap occurs at the
	 * first blank.
	 */
	for (p = text, q = new; *p; p++) {
		if (UNEXPECTED(*p == ' ')) {
			last_new_blank = q;
			last_blank_count = line_count++;
			*q++ = ' ';
		} else if (UNEXPECTED(*p == '\n')) {
			last_new_blank = NULL;
			*q++ = *p;
			last_blank_count = 0;
			line_count = 0;
		} else if (UNEXPECTED(p[0] == '*') && p[1] == '*') {
			if (bold_escape_len) {
				in_bold = !in_bold;
				memcpy (q, in_bold ? bold_on_escape : bold_off_escape, bold_escape_len);
				q += bold_escape_len;
				/* bold on/off has zero print width so line count is unchanged */
			}
			p++;
		} else if (UNEXPECTED(p[0] == '$') && p[1] == 'P') {
			memcpy (q, prompt_escape, prompt_escape_len);
			q += prompt_escape_len;
			line_count += prompt_len;
			p++;
		} else if (UNEXPECTED(p[0] == '\\')) {
			p++;
			*q++ = *p;
			line_count++;
		} else {
			*q++ = *p;
			line_count++;
		}

		if (UNEXPECTED(line_count>=term_width) && last_new_blank) {
			*last_new_blank = '\n';
			last_new_blank = NULL;
			line_count -= last_blank_count;
			last_blank_count = 0;
		}
	}
	*q++ = '\0';

	if ((q-new)>size) {
		phpdbg_error("help", "overrun=\"%lu\"", "Output overrun of %lu bytes", ((q-new) - size));
	}

	phpdbg_out("%s", new);
	efree(new);
}  /* }}} */

/* {{{ summary_print.  Print a summary line giving, the command, its alias and tip */
void summary_print(phpdbg_command_t const * const cmd TSRMLS_DC)
{
	char *summary;
	spprintf(&summary, 0, "Command: **%s**  Alias: **%c**  **%s**\n", cmd->name, cmd->alias, cmd->tip);
	pretty_print(summary TSRMLS_CC);
	efree(summary);
}

/* {{{ get_help. Retries and formats text from the phpdbg help text table */
static char *get_help(const char * const key TSRMLS_DC)
{
	phpdbg_help_text_t *p;

	/* Note that phpdbg_help_text is not assumed to be collated in key order.  This is an
	   inconvience that means that help can't be logically grouped Not worth
	   the savings */

	for (p = phpdbg_help_text; p->key; p++) {
		if (!strcmp(p->key, key)) {
			return p->text;
		}
	}
	return "";   /* return empty string to denote no match found */
} /* }}} */

/* {{{ get_command.  Return number of matching commands from a command table.
 * Unlike the command parser, the help search is sloppy that is partial matches can occur
 *   * Any single character key is taken as an alias.
 *   * Other keys are matched again the table on the first len characters.
 *   * This means that non-unique keys can generate multiple matches.
 *   * The first matching command is returned as an OUT parameter. *
 * The rationale here is to assist users in finding help on commands. So unique matches
 * will be used to generate a help message but non-unique one will be used to list alternatives.
 */
static int get_command(
	const char *key, size_t len,      /* pointer and length of key */
	phpdbg_command_t const **command, /* address of first matching command  */
	phpdbg_command_t const * commands /* command table to be scanned */
	TSRMLS_DC)
{
	const phpdbg_command_t *c;
	unsigned int num_matches = 0;

	if (len == 1) {
		for (c=commands; c->name; c++) {
			if (c->alias == key[0]) {
				num_matches++;
				if ( num_matches == 1 && command) {
					*command = c;
				}
			}
		}
	} else {
		for (c=commands; c->name; c++) {
			if (!strncmp(c->name, key, len)) {
				++num_matches;
				if ( num_matches == 1 && command) {
					*command = c;
				}
			}
		}
	}

	return num_matches;

} /* }}} */

PHPDBG_COMMAND(help) /* {{{ */
{
	phpdbg_command_t const *cmd;
	int n;

	if (!param || param->type == EMPTY_PARAM) {
		pretty_print(get_help("overview!" TSRMLS_CC) TSRMLS_CC);
		return SUCCESS;
	}

	if (param && param->type == STR_PARAM) {
	    n = get_command(param->str, param->len, &cmd, phpdbg_prompt_commands TSRMLS_CC);

		if (n==1) {
			summary_print(cmd TSRMLS_CC);
			pretty_print(get_help(cmd->name TSRMLS_CC) TSRMLS_CC);
			return SUCCESS;

		} else if (n>1) {
			if (param->len > 1) {
				for (cmd=phpdbg_prompt_commands; cmd->name; cmd++) {
					if (!strncmp(cmd->name, param->str, param->len)) {
						summary_print(cmd TSRMLS_CC);
					}
				}
				pretty_print(get_help("duplicate!" TSRMLS_CC) TSRMLS_CC);
				return SUCCESS;
			} else {
				phpdbg_error("help", "type=\"ambiguousalias\" alias=\"%s\"", "Internal help error, non-unique alias \"%c\"", param->str[0]);
				return FAILURE;
			}

		} else { /* no prompt command found so try help topic */
		    n = get_command( param->str, param->len, &cmd, phpdbg_help_commands TSRMLS_CC);

			if (n>0) {
				if (cmd->alias == 'a') {   /* help aliases executes a canned routine */ 
					return cmd->handler(param TSRMLS_CC);
				} else {
					pretty_print(get_help(cmd->name TSRMLS_CC) TSRMLS_CC);
					return SUCCESS;
				}
			}
		}
	}

	return FAILURE;

} /* }}} */

PHPDBG_HELP(aliases) /* {{{ */
{
	const phpdbg_command_t *c, *c_sub;
	int len;

	/* Print out aliases for all commands except help as this one comes last */
	phpdbg_writeln("help", "", "Below are the aliased, short versions of all supported commands");
	phpdbg_xml("<helpcommands>");
	for(c = phpdbg_prompt_commands; c->name; c++) {
		if (c->alias && c->alias != 'h') {
			phpdbg_writeln("command", "name=\"%s\" alias=\"%c\" tip=\"%s\"", " %c     %-20s  %s", c->alias, c->name, c->tip);
			if (c->subs) {
				len = 20 - 1 - c->name_len;
				for(c_sub = c->subs; c_sub->alias; c_sub++) {
					if (c_sub->alias) {
						phpdbg_writeln("subcommand", "parent_alias=\"%c\" alias=\"%c\" parent=\"%s\" name=\"%-*s\" tip=\"%s\"", " %c %c   %s %-*s  %s",
							c->alias, c_sub->alias, c->name, len, c_sub->name, c_sub->tip);
					}
				}
			}
		}
	}

	phpdbg_xml("</helpcommands>");

	/* Print out aliases for help as this one comes last, with the added text on how aliases are used */
	get_command("h", 1, &c, phpdbg_prompt_commands TSRMLS_CC);
	phpdbg_writeln("aliasinfo", "alias=\"%c\" name=\"%-*s\" tip=\"%s\"", " %c     %-20s  %s\n", c->alias, c->name, c->tip);

	phpdbg_xml("<helpaliases>");

	len = 20 - 1 - c->name_len;
	for(c_sub = c->subs; c_sub->alias; c_sub++) {
		if (c_sub->alias) {
			phpdbg_writeln("alias", "parent_alias=\"%c\" alias=\"%c\" parent=\"%s\" name=\"%-*s\" tip=\"%s\"", " %c %c   %s %-*s  %s",
				c->alias, c_sub->alias, c->name, len, c_sub->name, c_sub->tip);
		}
	}

	phpdbg_xml("</helpaliases>");

	pretty_print(get_help("aliases!" TSRMLS_CC) TSRMLS_CC);
	return SUCCESS;
} /* }}} */


/* {{{ Help Text Table
 * Contains help text entries keyed by a lowercase ascii key.
 * Text is in ascii and enriched by a simple markup:
 *   ** toggles bold font emphasis.
 *   $P insert an bold phpdbg> prompt.
 *   \  escapes the following character. Note that this is itself escaped inside string
 *      constants so \\\\ is required to output a single \ e.g. as in namespace names.
 *
 * Text will be wrapped according to the STDOUT terminal width, so paragraphs are
 * flowed using the C stringizing and the CR definition.  Also note that entries
 * are collated in alphabetic order on key.
 *
 * Also note the convention that help text not directly referenceable as a help param
 * has a key ending in !
 */
#define CR "\n"
phpdbg_help_text_t phpdbg_help_text[] = {

/******************************** General Help Topics ********************************/
{"overview!", CR
"**phpdbg** is a lightweight, powerful and easy to use debugging platform for PHP5.4+" CR
"It supports the following commands:" CR CR

"**Information**" CR
"  **list**     list PHP source" CR
"  **info**     displays information on the debug session" CR
"  **print**    show opcodes" CR
"  **frame**    select a stack frame and print a stack frame summary" CR 
"  **back**     shows the current backtrace" CR
"  **help**     provide help on a topic" CR CR

"**Starting and Stopping Execution**" CR
"  **exec**     set execution context" CR
"  **run**      attempt execution" CR
"  **step**     continue execution until other line is reached" CR
"  **continue** continue execution" CR
"  **until**    continue execution up to the given location" CR
"  **finish**   continue up to end of the current execution frame" CR
"  **leave**    continue up to end of the current execution frame and halt after the calling instruction" CR
"  **break**    set a breakpoint at the specified target" CR
"  **watch**    set a watchpoint on $variable" CR
"  **clear**    clear one or all breakpoints" CR
"  **clean**    clean the execution environment" CR CR

"**Miscellaneous**" CR
"  **set**      set the phpdbg configuration" CR
"  **source**   execute a phpdbginit script" CR
"  **register** register a phpdbginit function as a command alias" CR
"  **sh**       shell a command" CR
"  **ev**       evaluate some code" CR
"  **quit**     exit phpdbg" CR CR

"Type **help <command>** or (**help alias**) to get detailed help on any of the above commands, "
"for example **help list** or **h l**.  Note that help will also match partial commands if unique "
"(and list out options if not unique), so **help clea** will give help on the **clean** command, "
"but **help cl** will list the summary for **clean** and **clear**." CR CR

"Type **help aliases** to show a full alias list, including any registered phpdginit functions" CR
"Type **help syntax** for a general introduction to the command syntax." CR
"Type **help options** for a list of phpdbg command line options." CR
"Type **help phpdbginit** to show how to customise the debugger environment."
},
{"options", CR
"Below are the command line options supported by phpdbg" CR CR
                          /* note the extra 4 space index in because of the extra **** */
"**Command Line Options and Flags**" CR
"  **Option**  **Example Argument**    **Description**" CR
"  **-c**      **-c**/my/php.ini       Set php.ini file to load" CR
"  **-d**      **-d**memory_limit=4G   Set a php.ini directive" CR
"  **-n**                          Disable default php.ini" CR
"  **-q**                          Suppress welcome banner" CR
"  **-v**                          Enable oplog output" CR
"  **-s**                          Enable stepping" CR
"  **-b**                          Disable colour" CR
"  **-i**      **-i**my.init           Set .phpdbginit file" CR
"  **-I**                          Ignore default .phpdbginit" CR
"  **-O**      **-O**my.oplog          Sets oplog output file" CR
"  **-r**                          Run execution context" CR
"  **-rr**                         Run execution context and quit after execution" CR
"  **-E**                          Enable step through eval, careful!" CR
"  **-S**      **-S**cli               Override SAPI name, careful!" CR
"  **-l**      **-l**4000              Setup remote console ports" CR
"  **-a**      **-a**192.168.0.3       Setup remote console bind address" CR
"  **-V**                          Print version number" CR
"  **--**      **--** arg1 arg2        Use to delimit phpdbg arguments and php $argv; append any $argv "
"argument after it" CR CR

"**Remote Console Mode**" CR CR

"This mode is enabled by specifying the **-a** option.  Phpdbg will bind only to the loopback "
"interface by default, and this can only be overridden by explicitly setting the remote console "
"bind address using the **-a** option. If **-a** is specied without an argument, then phpdbg "
"will bind to all available interfaces.  You should be aware of the security implications of "
"doing this, so measures should be taken to secure this service if bound to a publicly accessible "
"interface/port."
},

{"phpdbginit", CR
"Phpdgb uses an debugger script file to initialize the debugger context.  By default, phpdbg looks "
"for the file named **.phpdbginit** in the current working directory.  This location can be "
"overridden on the command line using the **-i** switch (see **help options** for a more "
"details)." CR CR

"Debugger scripts can also be executed using the **source** command." CR CR

"A script file can contain a sequence of valid debugger commands, comments and embedded PHP "
"code. " CR CR 

"Comment lines are prefixed by the **#** character.  Note that comments are only allowed in script "
"files and not in interactive sessions." CR CR 

"PHP code is delimited by the start and end escape tags **<:** and **:>**. PHP code can be used "
"to define application context for a debugging session and also to extend the debugger by defining "
"and **register** PHP functions as new commands." CR CR

"Also note that executing a **clear** command will cause the current **phpdbginit** to be reparsed "
"/ reloaded."
},

{"syntax", CR
"Commands start with a keyword, and some (**break**, "
"**info**, **set**, **print** and **list**) may include a subcommand keyword.  All keywords are "
"lower case but also have a single letter alias that may be used as an alternative to typing in the"
"keyword in full.  Note some aliases are uppercase, and that keywords cannot be abbreviated other "
"than by substitution by the alias." CR CR

"Some commands take an argument.  Arguments are typed according to their format:" CR
"     *  **omitted**" CR
"     *  **address**      **0x** followed by a hex string" CR
"     *  **number**       an optionally signed number" CR
"     *  **method**       a valid **Class::methodName** expression" CR
"     *  **func#op**      a valid **Function name** follow by # and an integer" CR
"     *  **method#op**    a valid **Class::methodName** follow by # and an integer" CR
"     *  **string**       a general string" CR
"     *  **function**     a valid **Function name**" CR
"     *  **file:line**    a valid **filename** follow by : and an integer" CR CR

"In some cases the type of the argument enables the second keyword to be omitted." CR CR

"Type **help** for an overview of all commands and type **help <command>** to get detailed help "
"on any specific command." CR CR

"**Valid Examples**" CR CR

"     $P quit" CR
"     $P q" CR
"     Quit the debugger" CR CR

"     $P ev $total[2]" CR
"     Evaluate and print the variable $total[2] in the current stack frame" CR
"    " CR
"     $P break 200" CR
"     $P b my_source.php:200" CR
"     Break at line 200 in the current source and in file **my_source.php**. " CR CR

"     $P b @ ClassX::get_args if $arg[0] == \"fred\"" CR
"     $P b ~ 3" CR
"     Break at ClassX::get_args() if $arg[0] == \"fred\" and delete breakpoint 3" CR CR

"**Examples of invalid commands**" CR

"     $P #This is a comment" CR
"     Comments introduced by the **#** character are only allowed in **phpdbginit** script files."
},

/******************************** Help Codicils ********************************/
{"aliases!", CR
"Note that aliases can be used for either command or sub-command keywords or both, so **info b** "
"is a synomyn for **info break** and **l func** for **list func**, etc." CR CR

"Note that help will also accept any alias as a parameter and provide help on that command, for example **h p** will provide help on the print command."
},

{"duplicate!", CR
"Parameter is not unique. For detailed help select help on one of the above commands."
},

/******************************** Help on Commands ********************************/
{"back",
"Provide a formatted backtrace using the standard debug_backtrace() functionality.  An optional "
"unsigned integer argument specifying the maximum number of frames to be traced; if omitted then "
"a complete backtrace is given." CR CR

"**Examples**" CR CR
"    $P back 5" CR
"    $P t " CR
" " CR
"A backtrace can be executed at any time during execution."
},

{"break",
"Breakpoints can be set at a range of targets within the execution environment.  Execution will "
"be paused if the program flow hits a breakpoint.  The break target can be one of the following "
"types:" CR CR

"  **Target**   **Alias** **Purpose**" CR
"  **at**       **A**     specify breakpoint by location and condition" CR
"  **del**      **d**     delete breakpoint by breakpoint identifier number" CR CR

"**Break at** takes two arguments. The first is any valid target. The second "
"is a valid PHP expression which will trigger the break in "
"execution, if evaluated as true in a boolean context at the specified target." CR CR

"Note that breakpoints can also be disabled and re-enabled by the **set break** command." CR CR

"**Examples**" CR CR
"    $P break test.php:100" CR
"    $P b test.php:100" CR
"    Break execution at line 100 of test.php" CR CR

"    $P break 200" CR
"    $P b 200" CR
"    Break execution at line 200 of the currently PHP script file" CR CR

"    $P break \\\\mynamespace\\\\my_function" CR
"    $P b \\\\mynamespace\\\\my_function" CR
"    Break execution on entry to \\\\mynamespace\\\\my_function" CR CR

"    $P break classX::method" CR
"    $P b classX::method" CR
"    Break execution on entry to classX::method" CR CR

"    $P break 0x7ff68f570e08" CR
"    $P b 0x7ff68f570e08" CR
"    Break at the opline at the address 0x7ff68f570e08" CR CR

"    $P break my_function#14" CR
"    $P b my_function#14" CR
"    Break at the opline #14 of the function my_function" CR CR

"    $P break \\\\my\\\\class::method#2" CR
"    $P b \\\\my\\\\class::method#2" CR
"    Break at the opline #2 of the method \\\\my\\\\class::method" CR CR

"    $P break test.php:#3" CR
"    $P b test.php:#3" CR
"    Break at opline #3 in test.php" CR CR

"    $P break if $cnt > 10" CR
"    $P b if $cnt > 10" CR
"    Break when the condition ($cnt > 10) evaluates to true" CR CR

"    $P break at phpdbg::isGreat if $opt == 'S'" CR
"    $P break @ phpdbg::isGreat if $opt == 'S'" CR
"    Break at any opcode in phpdbg::isGreat when the condition ($opt == 'S') is true" CR CR

"    $P break at test.php:20 if !isset($x)" CR
"    Break at every opcode on line 20 of test.php when the condition evaluates to true" CR CR

"    $P break ZEND_ADD" CR
"    $P b ZEND_ADD" CR
"    Break on any occurrence of the opcode ZEND_ADD" CR CR

"    $P break del 2" CR
"    $P b ~ 2" CR
"    Remove breakpoint 2" CR CR

"Note: Conditional breaks are costly in terms of runtime overhead. Use them only when required "
"as they significantly slow execution." CR CR

"Note: An address is only valid for the current compilation."
},

{"clean",
"Classes, constants or functions can only be declared once in PHP.  You may experience errors "
"during a debug session if you attempt to recompile a PHP source.  The clean command clears "
"the Zend runtime tables which holds the sets of compiled classes, constants and functions, "
"releasing any associated storage back into the storage pool.  This enables recompilation to "
"take place." CR CR

"Note that you cannot selectively trim any of these resource pools. You can only do a complete "
"clean."
},

{"clear",
"Clearing breakpoints means you can once again run code without interruption." CR CR

"Note: use break delete N to clear a specific breakpoint." CR CR

"Note: if all breakpoints are cleared, then the PHP script will run until normal completion."
},

{"ev",
"The **ev** command takes a string expression which it evaluates and then displays. It "
"evaluates in the context of the lowest (that is the executing) frame, unless this has first "
"been explicitly changed by issuing a **frame** command. " CR CR

"**Examples**" CR CR
"    $P ev $variable" CR
"    Will print_r($variable) on the console, if it is defined" CR CR

"    $P ev $variable = \"Hello phpdbg :)\"" CR
"    Will set $variable in the current scope" CR CR

"Note that **ev** allows any valid PHP expression including assignments, function calls and "
"other write statements.  This enables you to change the environment during execution, so care "
"is needed here.  You can even call PHP functions which have breakpoints defined. " CR CR

"Note: **ev** will always show the result, so do not prefix the code with **return**"
},

{"exec",
"The **exec** command sets the execution context, that is the script to be executed.  The " 
"execution context must be defined either by executing the **exec** command or by using the "
"**-e** command line option." CR CR

"Note that the **exec** command also can be used to replace a previously defined execution "
"context." CR CR

"**Examples**" CR CR

"    $P exec /tmp/script.php" CR
"    $P e /tmp/script.php" CR
"    Set the execution context to **/tmp/script.php**"
},

//*********** Does F skip any breakpoints lower stack frames or only the current??
{"finish",
"The **finish** command causes control to be passed back to the vm, continuing execution.  Any "
"breakpoints that are encountered within the current stack frame will be skipped.  Execution "
"will then continue until the next breakpoint after leaving the stack frame or until "
"completion of the script" CR CR

"Note when **step**ping is enabled, any opcode steps within the current stack frame are also "
"skipped. "CR CR

"Note **finish** will trigger a \"not executing\" error if not executing."
},

{"frame",
"The **frame** takes an optional integer argument. If omitted, then the current frame is displayed "
"If specified then the current scope is set to the corresponding frame listed in a **back** trace. " "This can be used to allowing access to the variables in a higher stack frame than that currently "
"being executed." CR CR

"**Examples**" CR CR
"    $P frame 2" CR
"    $P ev $count" CR
"    Go to frame 2 and print out variable **$count** in that frame" CR CR

"Note that this frame scope is discarded when execution continues, with the execution frame "
"then reset to the lowest executiong frame."
},

{"info",
"**info** commands provide quick access to various types of information about the PHP environment" CR
"Specific info commands are show below:" CR CR

"  **Target**   **Alias**  **Purpose**" CR
"  **break**    **b**      show current breakpoints" CR
"  **files**    **F**      show included files" CR
"  **classes**  **c**      show loaded classes" CR
"  **funcs**    **f**      show loaded functions" CR
"  **error**    **e**      show last error" CR
"  **vars**     **v**      show active variables" CR
"  **globals**  **g**      show superglobal variables" CR
"  **literal**  **l**      show active literal constants" CR
"  **memory**   **m**      show memory manager stats"
},

// ******** same issue about breakpoints in called frames
{"leave",
"The **leave** command causes control to be passed back to the vm, continuing execution.  Any "
"breakpoints that are encountered within the current stack frame will be skipped.  In effect a "
"temporary breakpoint is associated with any return opcode, so that a break in execution occurs "
"before leaving the current stack frame. This allows inspection / modification of any frame "
"variables including the return value before it is returned" CR CR

"**Examples**" CR CR

"    $P leave" CR
"    $P L" CR CR

"Note when **step**ping is enabled, any opcode steps within the current stack frame are also "
"skipped. "CR CR

"Note **leave** will trigger a \"not executing\" error if not executing."
},

{"list",
"The list command displays source code for the given argument.  The target type is specficied by "
"a second subcommand keyword:" CR CR

"  **Type**     **Alias**  **Purpose**" CR
"  **lines**    **l**      List N lines from the current execution point" CR
"  **func**     **f**      List the complete source for a specified function" CR
"  **method**   **m**      List the complete source for a specified class::method" CR
"  **class**    **c**      List the complete source for a specified class" CR CR

"Note that the context of **lines**, **func** and **method** can be determined by parsing the "
"argument, so these subcommands are optional.  However, you must specify the **class** keyword "
"to list off a class." CR CR

"**Examples**" CR CR
"    $P list 2" CR
"    $P l l 2" CR
"    List the next 2 lines from the current file" CR CR

"    $P list my_function" CR
"    $P l f my_function" CR
"    List the source of the function **my_function**" CR CR

//************ ????
"    $P list func .mine" CR
"    $P l f .mine" CR
"    List the source of the method **mine** from the active class in scope" CR CR

"    $P list m my::method" CR
"    $P l my::method" CR
"    List the source of **my::method**" CR CR

"    $P list c myClass" CR
"    $P l c myClass" CR
"    List the source of **myClass**" CR CR

"Note that functions and classes can only be listed if the corresponding classes and functions "
"table in the Zend executor has a corresponding entry.  You can use the compile command to "
"populate these tables for a given execution context."
},

{"continue",
"Continue with execution after hitting a break or watchpoint" CR CR

"**Examples**" CR CR
"    $P continue" CR
"    $P c" CR
"    Continue executing until the next break or watchpoint" CR CR

"Note **continue** will trigger a \"not running\" error if not executing."
},

{"print",
"By default, print will show information about the current execution context." CR
"Other printing commands give access to instruction information." CR
"Specific printers loaded are show below:" CR CR

"  **Type**    **Alias**  **Purpose**" CR
"  **exec**    **e**      print out the instructions in the execution context" CR
"  **opline**  **o**      print out the instruction in the current opline" CR
"  **class**   **c**      print out the instructions in the specified class" CR
"  **method**  **m**      print out the instructions in the specified method" CR
"  **func**    **f**      print out the instructions in the specified function" CR
"  **stack**   **s**      print out the instructions in the current stack" CR CR

"**Examples**" CR CR
"    $P print class \\\\my\\\\class" CR
"    $P p c \\\\my\\\\class" CR
"    Print the instructions for the methods in \\\\my\\\\class" CR CR

"    $P print method \\\\my\\\\class::method" CR
"    $P p m \\\\my\\\\class::method" CR
"    Print the instructions for \\\\my\\\\class::method" CR CR

"    $P print func .getSomething" CR
"    $P p f .getSomething" CR
//************* Check this local method scope
"    Print the instructions for ::getSomething in the active scope" CR CR

"    $P print func my_function" CR
"    $P p f my_function" CR
"    Print the instructions for the global function my_function" CR CR

"    $P print opline" CR
"    $P p o" CR
"    Print the instruction for the current opline" CR CR

"    $P print exec" CR
"    $P p e" CR
"    Print the instructions for the execution context" CR CR

"    $P print stack" CR
"    $P p s" CR
"    Print the instructions for the current stack"
},

{"register",
//******* Needs a general explanation of the how registered functions work
"Register any global function for use as a command in phpdbg console" CR CR

"**Examples**" CR CR
"    $P register scandir" CR
"    $P R scandir" CR
"    Will register the scandir function for use in phpdbg" CR CR

"Note: arguments passed as strings, return (if present) print_r'd on console"
},

{"run",
"Enter the vm, startinging execution. Execution will then continue until the next breakpoint "
"or completion of the script. Add parameters you want to use as $argv"
"**Examples**" CR CR
"    $P run" CR
"    $P r" CR
"    Will cause execution of the context, if it is set" CR CR
"    $P r test" CR
"    Will execute with $argv[1] == \"test\"" CR CR

"Note that the execution context must be set. If not previously compiled, then the script will "
"be compiled before execution." CR CR

"Note that attempting to run a script that is already executing will result in an \"execution "
"in progress\" error."
},

{"set",
"The **set** command is used to configure how phpdbg looks and behaves.  Specific set commands "
"are as follows:" CR CR

"   **Type**    **Alias**    **Purpose**" CR
"   **prompt**     **p**     set the prompt" CR
"   **color**      **c**     set color  <element> <color>" CR
"   **colors**     **C**     set colors [<on|off>]" CR
"   **oplog**      **O**     set oplog [output]" CR
"   **break**      **b**     set break **id** <on|off>" CR
"   **breaks**     **B**     set breaks [<on|off>]" CR
"   **quiet**      **q**     set quiet [<on|off>]" CR
"   **stepping**   **s**     set stepping [<opcode|line>]" CR
"   **refcount**   **r**     set refcount [<on|off>] " CR CR

"Valid colors are **none**, **white**, **red**, **green**, **yellow**, **blue**, **purple**, "
"**cyan** and **black**.  All colours except **none** can be followed by an optional "
"**-bold** or **-underline** qualifier." CR CR

"Color elements can be one of **prompt**, **notice**, or **error**." CR CR

"**Examples**" CR CR
"     $P S C on" CR
"     Set colors on" CR CR

"     $P set p >" CR
"     $P set color prompt white-bold" CR
"     Set the prompt to a bold >" CR CR

"     $P S c error red-bold" CR
"     Use red bold for errors" CR CR

"     $P S refcount on" CR
"     Enable refcount display when hitting watchpoints" CR CR

"     $P S b 4 off" CR
"     Temporarily disable breakpoint 4.  This can be subsequently reenabled by a **s b 4 on**." CR
//*********** check oplog syntax
},

{"sh",
"Direct access to shell commands saves having to switch windows/consoles" CR CR

"**Examples**" CR CR
"    $P sh ls /usr/src/php-src" CR
"    Will execute ls /usr/src/php-src, displaying the output in the console"
//*********** what does this mean????Note: read only commands please!
},

{"source",
"Sourcing a **phpdbginit** script during your debugging session might save some time." CR CR

"**Examples**" CR CR

"    $P source /my/init" CR
"    $P < /my/init" CR
"    Will execute the phpdbginit file at /my/init" CR CR
},

{"export",
"Exporting breakpoints allows you to share, and or save your current debugging session" CR CR

"**Examples**" CR CR

"    $P export /my/exports" CR
"    $P > /my/exports" CR
"    Will export all breakpoints to /my/exports" CR CR
},

{"step",
"Execute opcodes until next line" CR CR

"**Examples**" CR CR

"    $P s" CR
"    Will continue and break again in the next encountered line" CR CR
},

{"until",
"The **until** command causes control to be passed back to the vm, continuing execution.  Any "
"breakpoints that are encountered before the next source line will be skipped.  Execution "
"will then continue until the next breakpoint or completion of the script" CR CR

"Note when **step**ping is enabled, any opcode steps within the current line are also skipped. "CR CR

"Note that if the next line is **not** executed then **all** subsequent breakpoints will be "
"skipped. " CR CR

"Note **until** will trigger a \"not executing\" error if not executing."

},
{"watch",
"Sets watchpoints on variables as long as they are defined" CR
"Passing no parameter to **watch**, lists all actually active watchpoints" CR CR

"**Format for $variable**" CR CR
"   **$var**      Variable $var" CR
"   **$var[]**    All array elements of $var" CR
"   **$var->**    All properties of $var" CR
"   **$var->a**   Property $var->a" CR
"   **$var[b]**   Array element with key b in array $var" CR CR

"Subcommands of **watch**:" CR CR

"   **Type**     **Alias**      **Purpose**" CR
"   **array**       **a**       Sets watchpoint on array/object to observe if an entry is added or removed" CR
"   **recursive**   **r**       Watches variable recursively and automatically adds watchpoints if some entry is added to an array/object" CR
"   **delete**      **d**       Removes watchpoint" CR CR

"Note when **recursive** watchpoints are removed, watchpoints on all the children are removed too" CR CR

"**Examples**" CR CR
"     $P watch" CR
"     List currently active watchpoints" CR CR

"     $P watch $array" CR
"     $P w $array" CR
"     Set watchpoint on $array" CR CR

"     $P watch recursive $obj->" CR
"     $P w r $obj->" CR
"     Set recursive watchpoint on $obj->" CR CR

"     $P watch delete $obj->a" CR
"     $P w d $obj->a" CR
"     Remove watchpoint $obj->a" CR CR

"Technical note: If using this feature with a debugger, you will get many segmentation faults, each time when a memory page containing a watched address is hit." CR
"                You then you can continue, phpdbg will remove the write protection, so that the program can continue." CR
"                If phpdbg could not handle that segfault, the same segfault is triggered again and this time phpdbg will abort."
},
{NULL, NULL /* end of table marker */}
};  /* }}} */