|
#############################################################################
##
## tools/utils.gi
## Copyright (C) 2013-2022 James D. Mitchell
##
## Licensing information can be found in the README file of this package.
##
#############################################################################
##
## This file contains utilities for use with the Semigroups package.
# No attempt has been made to get good test coverage for this file, since it
# will hopefully be binned in the near future.
# The file is organised as follows:
#
# 1. Tests - functions relating to testing Semigroups
#
# 2. Documentation - functions relating to compiling and verifying the
# documentation.
InstallGlobalFunction(ToBeat,
function(list, arg...)
local rank, rank_to_beat;
Assert(1, IsList(list));
rank := Sum(list, RankFilter);
rank_to_beat := Maximum(List(arg, x -> Sum(x, RankFilter)));
if rank > rank_to_beat then
return 0;
else
return rank_to_beat - rank + 1;
fi;
end);
#############################################################################
# 1. Tests - internal stuff . . .
#############################################################################
SEMIGROUPS.TestRec := rec();
SEMIGROUPS.TestRec.reportDiff := function(inp, expout, found, fnam, line, _)
Print("######## > Diff in:\n");
if IsStream(fnam) then
Print("test stream, line ", line, "\n");
else
Print(fnam, ":", line, "\n");
fi;
Print("# Input is:\n", inp);
Print("# Expected output:\n\033[30;42m", Chomp(expout), "\033[0m\n");
Print("# But found:\n\033[30;41m", Chomp(found), "\033[0m\n");
Print("########\n");
return;
end;
SEMIGROUPS.StartTest := function()
local record;
record := SEMIGROUPS.TestRec;
# store current info levels
record.InfoLevelInfoWarning := InfoLevel(InfoWarning);
record.InfoLevelInfoSemigroups := InfoLevel(InfoSemigroups);
record.InfoLevelInfoOrb := InfoLevel(InfoOrb);
record.InfoLevelInfoGenSS := InfoLevel(InfoGenSS);
record.InfoLevelInfoPackageLoading := InfoLevel(InfoPackageLoading);
# store current user preferences
record.PartialPermDisplayLimit :=
UserPreference("PartialPermDisplayLimit");
record.TransformationDisplayLimit :=
UserPreference("TransformationDisplayLimit");
record.NotationForPartialPerms :=
UserPreference("NotationForPartialPerms");
record.NotationForTransformations :=
UserPreference("NotationForTransformations");
record.FreeInverseSemigroupElementDisplay :=
UserPreference("semigroups", "FreeInverseSemigroupElementDisplay");
record.ViewObj :=
UserPreference("semigroups", "ViewObj");
# store current default options
record.SEMIGROUPS_DefaultOptionsRec :=
ShallowCopy(SEMIGROUPS.DefaultOptionsRec);
# set info levels
SetInfoLevel(InfoWarning, 0);
SetInfoLevel(InfoSemigroups, 0);
SetInfoLevel(InfoOrb, 0);
SetInfoLevel(InfoGenSS, 0);
SetInfoLevel(InfoPackageLoading, 0);
# set user preferences
SetUserPreference("PartialPermDisplayLimit",
100);
SetUserPreference("TransformationDisplayLimit",
100);
SetUserPreference("NotationForPartialPerms",
"component");
SetUserPreference("NotationForTransformations",
"input");
SetUserPreference("semigroups",
"FreeInverseSemigroupElementDisplay",
"minimal");
SetUserPreference("semigroups",
"ViewObj",
"semigroups-pkg");
# set default options
libsemigroups.set_report(false);
return;
end;
SEMIGROUPS.StopTest := function()
local record;
record := SEMIGROUPS.TestRec;
# restore info levels
SetInfoLevel(InfoWarning, record.InfoLevelInfoWarning);
SetInfoLevel(InfoSemigroups, record.InfoLevelInfoSemigroups);
SetInfoLevel(InfoOrb, record.InfoLevelInfoOrb);
SetInfoLevel(InfoGenSS, record.InfoLevelInfoGenSS);
SetInfoLevel(InfoSemigroups, record.InfoLevelInfoPackageLoading);
# restore user preferences
SetUserPreference("PartialPermDisplayLimit",
record.PartialPermDisplayLimit);
SetUserPreference("TransformationDisplayLimit",
record.TransformationDisplayLimit);
SetUserPreference("NotationForPartialPerms",
record.NotationForPartialPerms);
SetUserPreference("NotationForTransformations",
record.NotationForTransformations);
SetUserPreference("semigroups",
"FreeInverseSemigroupElementDisplay",
record.FreeInverseSemigroupElementDisplay);
SetUserPreference("semigroups",
"ViewObj",
record.ViewObj);
# restore default options
SEMIGROUPS.DefaultOptionsRec := record.SEMIGROUPS_DefaultOptionsRec;
GASMAN("collect");
return;
end;
SEMIGROUPS.RunTest := function(func)
local acting, passed;
if not (IsFunction(func) and NumberArgumentsFunction(func) = 0) then
ErrorNoReturn("the argument must be a 0-parameter function");
fi;
# Store global option
acting := SEMIGROUPS.DefaultOptionsRec.acting;
# Run tests with acting := true
Print("\033[1m");
Info(InfoWarning, 1, "Running tests with acting methods enabled");
Print("\033[0m");
SEMIGROUPS.DefaultOptionsRec.acting := true;
passed := func();
if not (IsBool(passed) and passed in [true, false]) then
ErrorNoReturn("the argument must be a function returning 'true'",
" or 'false'");
elif not passed then
SEMIGROUPS.DefaultOptionsRec.acting := acting;
return passed;
fi;
# Run tests with acting := false
Print("\033[1m");
Info(InfoWarning, 1, "Running tests with acting methods disabled");
Print("\033[0m");
SEMIGROUPS.DefaultOptionsRec.acting := false;
passed := func();
# Reset global options
SEMIGROUPS.DefaultOptionsRec.acting := acting;
return passed;
end;
SEMIGROUPS.TestDir := function(dir, arg)
local opts, name;
opts := rec(earlyStop := false,
testOptions := ShallowCopy(SEMIGROUPS.TestRec));
opts.testOptions.showProgress := false;
if Length(arg) = 1 and IsRecord(arg[1]) then
# Override default options with input ones.
for name in RecNames(arg[1]) do
opts.testOptions.(name) := arg[1].(name);
od;
# To allow the option from tst/teststandard.g to be processed
if "suppressStatusMessage" in RecNames(arg[1]) then
opts.suppressStatusMessage := arg[1].suppressStatusMessage;
fi;
elif Length(arg) <> 0 then
ErrorNoReturn("there must be no arguments, or the argument ",
"must be a record");
fi;
return SEMIGROUPS.RunTest({} -> TestDirectory(dir, opts));
end;
#############################################################################
# 1. Tests - user/global functions
#############################################################################
InstallGlobalFunction(SemigroupsTestInstall,
function(arg...)
local opts, name;
opts := ShallowCopy(SEMIGROUPS.TestRec);
if Length(arg) = 1 and IsRecord(arg[1]) then
# Override default options with input ones.
for name in RecNames(arg[1]) do
opts.(name) := arg[1].(name);
od;
elif Length(arg) <> 0 then
ErrorNoReturn("there must be no arguments, or the argument ",
"must be a record");
fi;
return SEMIGROUPS.RunTest(function()
return Test(Filename(DirectoriesPackageLibrary("semigroups",
"tst"),
"testinstall.tst"), opts);
end);
end);
InstallGlobalFunction(SemigroupsTestStandard,
function(arg...)
return SEMIGROUPS.TestDir(DirectoriesPackageLibrary("semigroups",
"tst/standard/")[1]![1],
arg);
end);
InstallGlobalFunction(SemigroupsTestExtreme,
function(arg...)
if IsEmpty(arg) then
arg := [rec(showProgress := "some")];
elif IsRecord(arg[1]) and not IsBound(arg[1].showProgress) then
arg[1].showProgress := "some";
fi;
return SEMIGROUPS.TestDir(DirectoriesPackageLibrary("semigroups",
"tst/extreme/"),
arg);
end);
InstallGlobalFunction(SemigroupsTestAll,
function(arg...)
SemigroupsMakeDoc();
if not CallFuncList(SemigroupsTestInstall, arg) then
Print("Abort: SemigroupsTestInstall failed . . . \n");
return false;
elif not CallFuncList(SemigroupsTestStandard, arg) then
Print("Abort: SemigroupsTestStandard failed . . . \n");
return false;
fi;
return SEMIGROUPS.TestManualExamples();
end);
################################################################################
# 2. Documentation - internal stuff
################################################################################
BindGlobal("SEMIGROUPS_DocXMLFiles",
function()
local dir;
dir := DirectoriesPackageLibrary("Semigroups", "doc")[1];
return Filtered(DirectoryContents(dir),
x -> (not StartsWith(x, "."))
and (not StartsWith(x, "z-"))
and EndsWith(x, ".xml"));
end);
InstallGlobalFunction(SemigroupsMakeDoc,
function()
local fname;
fname := Filename(DirectoriesPackageLibrary("Semigroups", ""), "makedoc.g");
Read(fname);
end);
SEMIGROUPS.ManualExamples := function()
if Filename(DirectoriesPackageLibrary("semigroups", "doc"),
"main.xml") = fail then
# The file main.xml only exists if AutoDoc has been run.
SemigroupsMakeDoc();
fi;
return ExtractExamples(DirectoriesPackageLibrary("semigroups", "doc"),
"main.xml",
SEMIGROUPS_DocXMLFiles(),
"Single");
end;
SEMIGROUPS.RunExamples := function(exlists, nums, excluded)
local oldscr, pad, total, fails, num, HighlightWS, l, sp, bad, s, start_time,
test, end_time, elapsed, pex, j, ex, i;
oldscr := SizeScreen();
SizeScreen([72, oldscr[2]]);
pad := function(nr)
nr := Length(String(Maximum(nums))) - Length(String(nr)) + 1;
return List([1 .. nr], x -> ' ');
end;
total := 0;
fails := [];
num := 0;
HighlightWS := function(str)
str := Chomp(str);
return ReplacedString(str, " \n", "~\n");
end;
for j in [1 .. Length(exlists)] do
if j in excluded then
Print("\033[44m# Skipping example ",
j,
pad(j),
" . . .\033[0m\n");
else
l := exlists[j];
Print("# Running example ", nums[j], pad(nums[j]), " . . .");
START_TEST("");
num := num + 1;
for ex in l do
sp := SplitString(ex[1], "\n", "");
bad := Filtered([1 .. Length(sp)], i -> Length(sp[i]) > 72);
s := InputTextString(ex[1]);
start_time := IO_gettimeofday();
test := Test(s, rec(compareFunction := "uptowhitespace",
ignoreComments := false,
width := 72,
EQ := \=,
reportDiff := Ignore,
showProgress := false));
end_time := IO_gettimeofday();
CloseStream(s);
elapsed := (end_time.tv_sec - start_time.tv_sec) * 1000
+ Int((end_time.tv_usec - start_time.tv_usec) / 1000);
total := total + elapsed;
pex := TEST.lastTestData;
Print(" msecs: ", elapsed, "\n");
if Length(bad) > 0 then
Print("\033[31m# WARNING: Overlong lines ",
bad,
" in ",
ex[2]{[1 .. 3]},
"\033[0m\n");
AddSet(fails, nums[j]);
fi;
if test = false then
for i in [1 .. Length(pex[1])] do
if pex[2][i] <> pex[4][i] then
Print("########> Diff in:\n",
"# ", ex[2][1], ":", ex[2][2],
"\n# Input is:\n");
PrintFormattedString(pex[1][i]);
Print("# Expected output:\n\033[30;42m");
PrintFormattedString(HighlightWS(pex[2][i]));
Print("\033[0m\n# But found:\n\033[30;41m");
PrintFormattedString(HighlightWS(pex[4][i]));
Print("\033[0m\n########\n");
AddSet(fails, nums[j]);
fi;
od;
fi;
od;
fi;
od;
SizeScreen(oldscr);
if Length(exlists) > 1 then
PrintFormatted("# {} failures in {} examples . . . msecs: {}\n",
Length(fails),
Sum(exlists, Length),
total);
fi;
if not IsEmpty(fails) then
Print("# Failed manual examples are:\n");
return fails;
fi;
return true;
end;
SEMIGROUPS.TestManualExamples := function(arg...)
local ex, nums, doc, tree, mansect, tester, actual, omit, acting, passed,
str;
ex := SEMIGROUPS.ManualExamples();
if IsEmpty(arg) then
nums := [1 .. Length(ex)];
elif Length(arg) = 1 then
if IsPosInt(arg[1]) and arg[1] <= Length(ex) then
ex := [ex[arg[1]]];
nums := [arg[1]];
elif IsHomogeneousList(arg[1])
and ForAll(arg[1], x -> IsPosInt(x) and x <= Length(ex)) then
ex := SEMIGROUPS.ManualExamples(){arg[1]};
nums := arg[1];
elif IsString(arg[1]) then
doc := ComposedXMLString(Concatenation(SEMIGROUPS.PackageDir, "/doc"),
"main.xml",
SEMIGROUPS_DocXMLFiles(),
true);
tree := ParseTreeXMLString(doc[1]);
CheckAndCleanGapDocTree(tree);
mansect := XMLElements(tree, "ManSection");
tester := function(record)
return IsBound(record.content[1].attributes.Name)
and record.content[1].attributes.Name = arg[1];
end;
mansect := First(mansect, tester);
if mansect = fail then
ErrorNoReturn("did not find a man section named ", arg[1]);
fi;
actual := ExtractExamplesXMLTree(mansect, "Single");
nums := [PositionProperty(ex, x -> x[1][1] = actual[1][1][1])];
ex := actual;
else
ErrorNoReturn("the argument must be a pos int or list of pos ints");
fi;
elif Length(arg) > 1 then
ErrorNoReturn("there should be 0 or 1 arguments");
fi;
omit := SEMIGROUPS.OmitFromTests;
if Length(omit) > 0 then
Print("# not testing examples containing the strings");
for str in omit do
ex := Filtered(ex, x -> PositionSublist(x[1][1], str) = fail);
Print(", \"", str, "\"");
od;
Print(" . . .\n");
fi;
acting := SEMIGROUPS.DefaultOptionsRec.acting;
Apply(ex, function(x)
x[1][1] := StripBeginEnd(x[1][1], "\n");
return x;
end);
SEMIGROUPS.DefaultOptionsRec.acting := true;
SEMIGROUPS.StartTest();
passed := SEMIGROUPS.RunExamples(ex, nums, []);
SEMIGROUPS.StopTest();
SEMIGROUPS.DefaultOptionsRec.acting := acting;
return passed;
end;
# The following is based on doc/ref/testconsistency.g
# Detect which ManSection should be used to document obj. Returns one of
# "Func", "Oper", "Meth", "Filt", "Prop", "Attr", "Var", "Fam", "InfoClass"
#
# See PRINT_OPERATION where some of the code below is borrowed
SEMIGROUPS.ManSectionType := function(op)
local class, flags, types, catok, repok, propok, seenprop, t;
if IsInfoClass(op) then
return "InfoClass";
elif IsFamily(op) then
return "Fam";
elif not IsFunction(op) then
return "Var";
elif IsFunction(op) and not IsOperation(op) then
return "Func";
elif IsOperation(op) then
class := "Oper";
if IS_IDENTICAL_OBJ(op, IS_OBJECT) then
class := "Filt";
elif IS_CONSTRUCTOR(op) then
class := "Constructor";
# seem to never get one
elif IsFilter(op) then
class := "Filt";
flags := TRUES_FLAGS(FLAGS_FILTER(op));
types := INFO_FILTERS{flags};
catok := true;
repok := true;
propok := true;
seenprop := false;
for t in types do
if not t in FNUM_REPS then
repok := false;
fi;
if not t in FNUM_CATS then
catok := false;
fi;
if not t in FNUM_PROS and not t in FNUM_TPRS then
propok := false;
fi;
if t in FNUM_PROS then
seenprop := true;
fi;
od;
if seenprop and propok then
class := "Prop";
elif catok then
class := "Filt";
# in PRINT_OPERATION - "Category";
elif repok then
class := "Filt";
# in PRINT_OPERATION - "Representation";
fi;
elif Tester(op) <> false then
# op is an attribute
class := "Attr";
fi;
return class;
else
return fail;
fi;
end;
# Checks whether ManSections are using the right kind of elements
SEMIGROUPS.CheckManSectionTypes := function(doc, verbose...)
local display_warnings, types, r, x, errcount, name, pos, obj, man, y, yint,
referrcount, warncount, type, matches, match, matches2, stats,
elt, t, s;
if IsEmpty(verbose) then
display_warnings := false;
else
display_warnings := verbose[1];
fi;
types := ["Func", "Oper", "Meth", "Filt", "Prop", "Attr", "Var", "Fam",
"InfoClass"];
r := ParseTreeXMLString(doc[1]);
CheckAndCleanGapDocTree(r);
x := XMLElements(r, types);
errcount := 0;
Print("****************************************************************\n");
Print("*** Checking types in ManSections \n");
Print("****************************************************************\n");
for elt in x do
name := elt.attributes.Name;
if not name in ["IsBound", "Unbind", "Info", "Assert", "TryNextMethod",
"QUIT", "-infinity"] then
if not IsBoundGlobal(name) then
pos := OriginalPositionDocument(doc[2], elt.start);
Print(pos[1], ":", pos[2], " : ", name, " is unbound \n");
errcount := errcount + 1;
else
obj := ValueGlobal(name);
man := SEMIGROUPS.ManSectionType(obj);
# we allow to use "Meth" for "Oper" but probably should issue a warning
# if there is no at least one "Oper" for any "Meth"
if (man <> elt.name) and
not (man in ["Attr", "Prop", "Oper"] and elt.name = "Meth") then
pos := OriginalPositionDocument(doc[2], elt.start);
Print(pos[1], ":", pos[2], " : ", name, " uses ", elt.name,
" instead of ", man, "\n");
errcount := errcount + 1;
fi;
fi;
fi;
od;
Print("****************************************************************\n");
Print("*** Checking types in cross-references \n");
Print("****************************************************************\n");
y := XMLElements(r, ["Ref"]);
Print("Found ", Length(y), " Ref elements ");
yint := Filtered(y, elt -> not IsBound(elt.attributes.BookName)
or (IsBound(elt.attributes.BookName)
and elt.attributes.BookName = "ref"));
Print("including ", Length(yint), " within the Reference manual\n");
y := Filtered(yint, elt -> ForAny(types, t -> IsBound(elt.attributes.(t))));
referrcount := 0;
warncount := 0;
for elt in y do
type := First(types, t -> IsBound(elt.attributes.(t)));
if type <> fail then
matches := Filtered(x, t -> t.attributes.Name = elt.attributes.(type));
if IsEmpty(matches) then
pos := OriginalPositionDocument(doc[2], elt.start);
Print(pos[1], ":", pos[2], " : no match for ", type, " := ",
elt.attributes.(type), "\n");
referrcount := referrcount + 1;
continue;
elif Length(matches) = 1 then
match := matches[1];
elif IsBound(elt.attributes.Label) then
matches := Filtered(matches, t -> IsBound(t.attributes.Label));
matches := Filtered(matches, t -> t.attributes.Label =
elt.attributes.Label);
if Length(matches) > 1 then
ErrorNoReturn("Multiple labels - this should not happen!");
fi;
match := matches[1];
else
matches2 := Filtered(matches, t -> not IsBound(t.attributes.Label));
if IsEmpty(matches2) then
pos := OriginalPositionDocument(doc[2], elt.start);
Print(pos[1], ":", pos[2],
" : no match (wrong type or missing label?) for ", type, " := ",
elt.attributes.(type), "\n");
Print(" Suggestions: \n");
matches := Filtered(matches, t -> IsBound(t.attributes.Label));
for t in matches do
Print("Use ", t.name, " with Label := \"", t.attributes.Label,
"\" (for Arg := \"", t.attributes.Arg, "\")\n");
od;
referrcount := referrcount + 1;
continue;
elif Length(matches2) > 1 then
ErrorNoReturn("Multiple labels - this should not happen!");
else
match := matches[1];
fi;
fi;
if match.name <> type then
pos := OriginalPositionDocument(doc[2], elt.start);
if display_warnings then
Print(pos[1], ":", pos[2], " : Ref to ", elt.attributes.(type),
" uses ", type, " instead of ", match.name, "\n");
fi;
warncount := warncount + 1;
fi;
fi;
od;
Print("****************************************************************\n");
stats := Collected(List(x, elt -> elt.name));
Print("Selected ", Length(x), " ManSections of the following types:\n");
for s in stats do
Print(s[1], " - ", s[2], "\n");
od;
Print("Found ", errcount, " errors in ManSection types \n");
Print("Selected ", Length(y), " Ref elements referring to ManSections \n");
Print("Found ", referrcount, " errors and ", warncount,
" warnings in Ref elements \n");
if display_warnings then
Print("To suppress warnings, use SEMIGROUPS.CheckManSectionTypes",
"(doc,false) or with one argument\n");
else
Print("To show warnings, use SEMIGROUPS.CheckManSectionTypes(doc,true);",
"\n");
fi;
Print("****************************************************************\n");
return errcount = 0;
end;
SEMIGROUPS.CheckDocCoverage := function(doc)
local r, x, with, without, mansect, pos, y;
r := ParseTreeXMLString(doc[1]);
CheckAndCleanGapDocTree(r);
x := XMLElements(r, ["ManSection"]);
with := 0;
without := 0;
Print("****************************************************************\n");
Print("*** Looking for ManSections having no examples \n");
Print("****************************************************************\n");
for mansect in x do
pos := OriginalPositionDocument(doc[2], mansect.start);
y := XMLElements(mansect, ["Example"]);
if IsEmpty(y) then
if IsBound(mansect.content[1].attributes) and
IsBound(mansect.content[1].attributes.Name) then
Print(pos[1], ":", pos[2], " : ", mansect.content[1].attributes.Name);
elif IsBound(mansect.content[2].attributes) and
IsBound(mansect.content[2].attributes.Name) then
Print(pos[1], ":", pos[2], " : ", mansect.content[2].attributes.Name);
else
Print(pos[1], ":", pos[2], " : ",
mansect.content[1].content[1].content);
fi;
without := without + 1;
Print("\n");
else
with := with + 1;
fi;
od;
Print("****************************************************************\n");
Print("*** Doc coverage report \n");
Print("****************************************************************\n");
Print(Length(x), " mansections \n");
Print(with, " with examples \n");
Print(without, " without examples \n");
end;
SEMIGROUPS.CheckManualConsistency := function()
local doc;
doc := ComposedXMLString(Concatenation(SEMIGROUPS.PackageDir, "/doc"),
"main.xml",
SEMIGROUPS_DocXMLFiles(),
true);
SEMIGROUPS.CheckDocCoverage(doc);
return SEMIGROUPS.CheckManSectionTypes(doc, true);
end;
SEMIGROUPS.DocumentedPackageVariables := function()
local doc, r, x, out, mansect, record;
doc := ComposedXMLString(Concatenation(SEMIGROUPS.PackageDir, "/doc"),
"main.xml",
SEMIGROUPS_DocXMLFiles(),
true);
r := ParseTreeXMLString(doc[1]);
CheckAndCleanGapDocTree(r);
x := XMLElements(r, ["ManSection"]);
out := [];
for mansect in x do
for record in mansect.content do
if IsBound(record.attributes) and IsBound(record.attributes.Name) then
AddSet(out, record.attributes.Name);
fi;
od;
od;
return out;
end;
# info := PackageVariablesInfo("semigroups", "3.0.0");;
# which must be run before loading Semigroups
SEMIGROUPS.UndocumentedPackageVariables := function(info)
local out, suppressions, obsoletes, documented, name, part, entry;
out := [];
suppressions := ["*", ".", "/", "<", "=", "[]", "^", "in", "{}",
"HTAdd_TreeHash_C", "HTValue_TreeHash_C"];
obsoletes := [];
documented := SEMIGROUPS.DocumentedPackageVariables();
for part in info do
if (part[1]{[1 .. 3]} = "new" or part[1]{[1 .. 9]} = "other new") and not
part[1] = "new methods" then
for entry in part[2] do
name := entry[1][1];
if not name in suppressions
and not name in obsoletes
and not name in documented
and not ForAll(name, x -> IsUpperAlphaChar(x) or x = '_')
and not (Length(name) >= 3 and name{[1 .. 3]} = "Has")
and not (Length(name) >= 3 and name{[1 .. 3]} = "Set")
and not (Length(name) >= 11 and name{[1 .. 11]} = "SEMIGROUPS_")
and not (Length(name) >= 2
and name{[Length(name) - 1, Length(name)]} = "NC") then
AddSet(out, [name, JoinStringsWithSeparator(entry[2], ":")]);
fi;
od;
fi;
od;
return out;
end;
[ Verzeichnis aufwärts0.59unsichere Verbindung
Übersetzung europäischer Sprachen durch Browser
]
|