filter - 2020.2 English

Filter a list, resulting in new list

Syntax

filter [‑regexp] [‑nocase] [‑quiet] [‑verbose] [<objects>] [<filter>]

Returns

new list

Usage

Name	Description
`[-regexp]`	Operators =~ and !~ use regular expressions
`[-nocase]`	Perform case-insensitive matching (valid only when -regexp specified)
`[-quiet]`	Ignore command errors
`[-verbose]`	Suspend message limits during command execution
`[<objects>]`	List of objects to filter
`[<filter>]`	Filter list with expression

Description

Takes a list of objects, and returns a reduced list of objects that match the specified filter search pattern.

Arguments

-regexp - (Optional) Specifies that the search <patterns> are written as regular expressions. Both search <patterns> and -filter expressions must be written as regular expressions when this argument is used. Xilinx regular expression Tcl commands are always anchored to the start of the search string. You can add ".*" to the beginning or end of a search string to widen the search to include a substring. See http://perldoc.perl.org/perlre.html for help with regular expression syntax.

Note: The Tcl built-in command regexp is not anchored, and works as a standard Tcl command. For more information refer to http://www.tcl.tk/man/tcl8.5/TclCmd/regexp.htm.

-nocase - (Optional) Perform case-insensitive matching when a pattern has been specified. This argument applies to the use of -regexp only.

-quiet - (Optional) Execute the command quietly, returning no messages from the command. The command also returns TCL_OK regardless of any errors encountered during execution.

Note: Any errors encountered on the command-line, while launching the command, will be returned. Only errors occurring inside the command will be trapped.

-verbose - (Optional) Temporarily override any message limits and return all messages from this command.

Note: Message limits can be defined with the set_msg_config command.

<objects> - (Optional) A list of objects that should be filtered to reduce the set to the desired results. The list of objects can be obtained by using one of the many get_* commands such as get_parts.

<filter> - (Optional) The expression to use for filtering. The specified pattern filters the list of objects returned based on property values on the objects. You can find out which properties are on an object with the report_property or list_property command. Any property/value pair can be used as a filter. For example, in the case of the "part" object, "DEVICE", "FAMILY" and "SPEED" are some of the properties that can be used to filter results.

The filter search pattern should be quoted to avoid having to escape special characters that may be found in net, pin, or cell names, or other properties. String matching is case-sensitive and is always anchored to the start and to the end of the search string. The wildcard “*” character can be used at the beginning or at the end of a search string to widen the search to include a substring of the property value.

Note: The filter returns an object if a specified property exists on the object, and the specified pattern matches the property value on the object. In the case of the "*" wildcard character, this will match a property with a defined value of "".

For string comparison, the specific operators that can be used in filter expressions are "equal" (==), "not-equal" (!=), "match" (=~), and "not-match" (!~). Numeric comparison operators <, >, <=, and >= can also be used. Multiple filter expressions can be joined by AND and OR (&& and ||). The following gets input pins that do NOT contain the “RESET” substring within their name:

get_pins * -filter {DIRECTION == IN && NAME !~ "*RESET*"}

Boolean (bool) type properties can be directly evaluated in filter expressions as true or not true:

-filter {IS_PRIMITIVE && !IS_LOC_FIXED}

Examples

The following example returns a list of parts filtered for the specified speed grade:

filter [get_parts] {speed == -3}

The following example filters parts based according to speed grade -3 OR speed grade -2. All parts matching either speed grade will be returned.

filter [get_parts] {speed == -3  ||  speed == -2}

The following example uses regular expression and returns a list of VStatus ports in the design, with zero or more wildcards, and the numbers 0 to 9 appearing one or more times within square brackets:

filter -regexp [get_ports] {NAME =~ VStatus.*\[[0-9]+\]}