'''info complete''' ''command''

Returns '''1''' if ''command'' is a complete Tcl command in the sense of having no unclosed quotes, braces, brackets or array element names, If the command doesn't appear to be complete then '''0''' is returned. This command is typically used in line-oriented input environments to allow users to type in commands that span multiple lines; if the command isn't complete, the script can delay evaluating it until additional lines have been typed to complete the command.
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[RS]: Could it be that [info complete] can be used generally to check whether a string can be parsed as a list? I used to use
 expr {![catch {llength $x}]}
for that purpose...
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See also:

   * [info]

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[Category Command] - [Tcl syntax help]