path: root/tests/foreach.test

# Commands covered:  foreach, continue, break
#
# This file contains a collection of tests for one or more of the Tcl
# built-in commands.  Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# Copyright (c) 1991-1993 The Regents of the University of California.
# Copyright (c) 1994-1997 Sun Microsystems, Inc.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.

if {[lsearch [namespace children] ::tcltest] == -1} {
    package require tcltest
    namespace import -force ::tcltest::*
}

catch {unset a}
catch {unset x}

# Basic "foreach" operation.

test foreach-1.1 {basic foreach tests} {
    set a {}
    foreach i {a b c d} {
	set a [concat $a $i]
    }
    set a
} {a b c d}
test foreach-1.2 {basic foreach tests} {
    set a {}
    foreach i {a b {{c d} e} {123 {{x}}}} {
	set a [concat $a $i]
    }
    set a
} {a b {c d} e 123 {{x}}}
test foreach-1.3 {basic foreach tests} {catch {foreach} msg} 1
test foreach-1.4 {basic foreach tests} {
    catch {foreach} msg
    set msg
} {wrong # args: should be "foreach varList list ?varList list ...? command"}
test foreach-1.5 {basic foreach tests} {catch {foreach i} msg} 1
test foreach-1.6 {basic foreach tests} {
    catch {foreach i} msg
    set msg
} {wrong # args: should be "foreach varList list ?varList list ...? command"}
test foreach-1.7 {basic foreach tests} {catch {foreach i j} msg} 1
test foreach-1.8 {basic foreach tests} {
    catch {foreach i j} msg
    set msg
} {wrong # args: should be "foreach varList list ?varList list ...? command"}
test foreach-1.9 {basic foreach tests} {catch {foreach i j k l} msg} 1
test foreach-1.10 {basic foreach tests} {
    catch {foreach i j k l} msg
    set msg
} {wrong # args: should be "foreach varList list ?varList list ...? command"}
test foreach-1.11 {basic foreach tests} {
    set a {}
    foreach i {} {
	set a [concat $a $i]
    }
    set a
} {}
test foreach-1.12 {foreach errors} {
    list [catch {foreach {{a}{b}} {1 2 3} {}} msg] $msg
} {1 {list element in braces followed by "{b}" instead of space}}
test foreach-1.13 {foreach errors} {
    list [catch {foreach a {{1 2}3} {}} msg] $msg
} {1 {list element in braces followed by "3" instead of space}}
catch {unset a}
test foreach-1.14 {foreach errors} {
    catch {unset a}
    set a(0) 44
    list [catch {foreach a {1 2 3} {}} msg o] $msg $::errorInfo
} {1 {can't set "a": variable is array} {can't set "a": variable is array
    (setting foreach loop variable "a")
    invoked from within
"foreach a {1 2 3} {}"}}
test foreach-1.15 {foreach errors} {
    list [catch {foreach {} {} {}} msg] $msg
} {1 {foreach varlist is empty}}
catch {unset a}

test foreach-2.1 {parallel foreach tests} {
    set x {}
    foreach {a b} {1 2 3 4} {
	append x $b $a
    }
    set x
} {2143}
test foreach-2.2 {parallel foreach tests} {
    set x {}
    foreach {a b} {1 2 3 4 5} {
	append x $b $a
    }
    set x
} {21435}
test foreach-2.3 {parallel foreach tests} {
    set x {}
    foreach a {1 2 3} b {4 5 6} {
	append x $b $a
    }
    set x
} {415263}
test foreach-2.4 {parallel foreach tests} {
    set x {}
    foreach a {1 2 3} b {4 5 6 7 8} {
	append x $b $a
    }
    set x
} {41526378}
test foreach-2.5 {parallel foreach tests} {
    set x {}
    foreach {a b} {a b A B aa bb} c {c C cc CC} {
	append x $a $b $c
    }
    set x
} {abcABCaabbccCC}
test foreach-2.6 {parallel foreach tests} {
    set x {}
    foreach a {1 2 3} b {1 2 3} c {1 2 3} d {1 2 3} e {1 2 3} {
	append x $a $b $c $d $e
    }
    set x
} {111112222233333}
test foreach-2.7 {parallel foreach tests} {
    set x {}
    foreach a {} b {1 2 3} c {1 2} d {1 2 3 4} e {{1 2}} {
	append x $a $b $c $d $e
    }
    set x
} {1111 2222334}
test foreach-2.8 {foreach only sets vars if repeating loop} {
    proc foo {} {
        set rgb {65535 0 0}
        foreach {r g b} [set rgb] {}
        return "r=$r, g=$g, b=$b"
    }
    foo
} {r=65535, g=0, b=0}
test foreach-2.9 {foreach only supports local scalar variables} {
    proc foo {} {
        set x {}
        foreach {a(3)} {1 2 3 4} {lappend x [set {a(3)}]}
        set x
    }
    foo
} {1 2 3 4}

test foreach-3.1 {compiled foreach backward jump works correctly} {
    catch {unset x}
    proc foo {arrayName} {
        upvar 1 $arrayName a
        set l {}
        foreach member [array names a] {
            lappend l [list $member [set a($member)]]
        }
        return $l
    }
    array set x {0 zero 1 one 2 two 3 three}
    lsort [foo x]
} [lsort {{0 zero} {1 one} {2 two} {3 three}}]

test foreach-4.1 {noncompiled foreach and shared variable or value list objects that are converted to another type} {
    catch {unset x}
    foreach {12.0} {a b c} {
        set x 12.0
        set x [expr $x + 1]
    }
    set x
} 13.0

# Check "continue".

test foreach-5.1 {continue tests} {catch continue} 4
test foreach-5.2 {continue tests} {
    set a {}
    foreach i {a b c d} {
	if {[string compare $i "b"] == 0} continue
	set a [concat $a $i]
    }
    set a
} {a c d}
test foreach-5.3 {continue tests} {
    set a {}
    foreach i {a b c d} {
	if {[string compare $i "b"] != 0} continue
	set a [concat $a $i]
    }
    set a
} {b}
test foreach-5.4 {continue tests} {catch {continue foo} msg} 1
test foreach-5.5 {continue tests} {
    catch {continue foo} msg
    set msg
} {wrong # args: should be "continue"}

# Check "break".

test foreach-6.1 {break tests} {catch break} 3
test foreach-6.2 {break tests} {
    set a {}
    foreach i {a b c d} {
	if {[string compare $i "c"] == 0} break
	set a [concat $a $i]
    }
    set a
} {a b}
test foreach-6.3 {break tests} {catch {break foo} msg} 1
test foreach-6.4 {break tests} {
    catch {break foo} msg
    set msg
} {wrong # args: should be "break"}
# Check for bug #406709
test foreach-6.5 {break tests} {
    proc a {} {
	set a 1
	foreach b b {list [concat a; break]; incr a}
	incr a
    }
    a
} {2}

# Test for incorrect "double evaluation" semantics
test foreach-7.1 {delayed substitution of body} {
    proc foo {} {
       set a 0
       foreach a [list 1 2 3] "
           set x $a
       "
       set x
    }
    foo
} {0}

# Test for [Bug 1189274]; crash on failure
test foreach-8.1 {empty list handling} {
    proc crash {} {
	rename crash {}
	set a "x y z"
	set b ""
	foreach aa $a bb $b { set x "aa = $aa bb = $bb" }
    }
    crash
} {}

# [Bug 1671138]; infinite loop with empty var list in bytecompiled version
test foreach-9.1 {compiled empty var list} {
    proc foo {} {
	foreach {} x {
	    error "reached body"
	}
    }
    list [catch { foo } msg] $msg
} {1 {foreach varlist is empty}}

test foreach-10.1 {foreach: [Bug 1671087]} -setup {
    proc demo {} {
	set vals {1 2 3 4}
	trace add variable x write {string length $vals ;# }
	foreach {x y} $vals {format $y}
    }
} -body {
    demo
} -cleanup {
    rename demo {}
} -result {}

# cleanup
catch {unset a}
catch {unset x}
catch {rename foo {}}
::tcltest::cleanupTests
return