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|
package pkglint
// Checks concerning single lines in Makefiles.
import (
"fmt"
"netbsd.org/pkglint/regex"
"netbsd.org/pkglint/textproc"
"path"
"strings"
)
// MkLine is a line from a Makefile fragment.
// There are several types of lines.
// The most common types in pkgsrc are variable assignments,
// shell commands and directives like .if and .for.
type MkLine = *MkLineImpl
type MkLineImpl struct {
Line
data interface{} // One of the following mkLine* types
}
type mkLineAssign = *mkLineAssignImpl // See https://github.com/golang/go/issues/28045
type mkLineAssignImpl struct {
commented bool // Whether the whole variable assignment is commented out
varname string // e.g. "HOMEPAGE", "SUBST_SED.perl"
varcanon string // e.g. "HOMEPAGE", "SUBST_SED.*"
varparam string // e.g. "", "perl"
op MkOperator //
valueAlign string // The text up to and including the assignment operator, e.g. VARNAME+=\t
value string // The trimmed value
valueMk []*MkToken // The value, sent through splitIntoMkWords
valueMkRest string // nonempty in case of parse errors
fields []string // The value, space-separated according to shell quoting rules
comment string
}
type mkLineShell struct {
command string
}
type mkLineComment struct{} // See mkLineAssignImpl.commented for another type of comment line
type mkLineEmpty struct{}
type mkLineDirective = *mkLineDirectiveImpl // See https://github.com/golang/go/issues/28045
type mkLineDirectiveImpl struct {
indent string // the space between the leading "." and the directive
directive string // "if", "else", "for", etc.
args string
comment string // mainly interesting for .endif and .endfor
elseLine MkLine // for .if (filled in later)
cond MkCond // for .if and .elif (filled in on first access)
fields []string // the arguments for the .for loop (filled in on first access)
}
type mkLineInclude = *mkLineIncludeImpl // See https://github.com/golang/go/issues/28045
type mkLineIncludeImpl struct {
mustExist bool // for .sinclude, nonexistent files are ignored
sys bool // whether the include uses <file.mk> (very rare) instead of "file.mk"
indent string // the space between the leading "." and the directive
includedFile string // the text between the <brackets> or "quotes"
conditionalVars []string // variables on which this inclusion depends (filled in later, as needed)
}
type mkLineDependency struct {
targets string
sources string
}
// NewMkLine parses the text of a Makefile line to see what kind of line
// it is: variable assignment, include, comment, etc.
//
// See devel/bmake/parse.c:/^Parse_File/
func NewMkLine(line Line) *MkLineImpl {
text := line.Text
// XXX: This check should be moved somewhere else. NewMkLine should only be concerned with parsing.
if hasPrefix(text, " ") && line.Basename != "bsd.buildlink3.mk" {
line.Warnf("Makefile lines should not start with space characters.")
G.Explain(
"If this line should be a shell command connected to a target, use a tab character for indentation.",
"Otherwise remove the leading whitespace.")
}
if m, commented, varname, spaceAfterVarname, op, valueAlign, value, spaceAfterValue, comment := MatchVarassign(text); m {
if spaceAfterVarname != "" {
switch {
case hasSuffix(varname, "+") && op == "=":
break
case matches(varname, `^[a-z]`) && op == ":=":
break
default:
// XXX: This check should be moved somewhere else. NewMkLine should only be concerned with parsing.
fix := line.Autofix()
fix.Notef("Unnecessary space after variable name %q.", varname)
fix.Replace(varname+spaceAfterVarname+op, varname+op)
fix.Apply()
}
}
// XXX: This check should be moved somewhere else. NewMkLine should only be concerned with parsing.
if comment != "" && value != "" && spaceAfterValue == "" {
line.Warnf("The # character starts a Makefile comment.")
G.Explain(
"In a variable assignment, an unescaped # starts a comment that",
"continues until the end of the line.",
"To escape the #, write \\#.")
}
return &MkLineImpl{line, &mkLineAssignImpl{
commented,
varname,
varnameCanon(varname),
varnameParam(varname),
NewMkOperator(op),
valueAlign,
strings.Replace(value, "\\#", "#", -1),
nil,
"",
nil,
comment}}
}
if hasPrefix(text, "\t") {
shellcmd := text[1:]
return &MkLineImpl{line, mkLineShell{shellcmd}}
}
trimmedText := trimHspace(text)
if strings.HasPrefix(trimmedText, "#") {
return &MkLineImpl{line, mkLineComment{}}
}
if trimmedText == "" {
return &MkLineImpl{line, mkLineEmpty{}}
}
if m, indent, directive, args, comment := matchMkDirective(text); m {
return &MkLineImpl{line, &mkLineDirectiveImpl{indent, directive, args, comment, nil, nil, nil}}
}
if m, indent, directive, includedFile := MatchMkInclude(text); m {
return &MkLineImpl{line, &mkLineIncludeImpl{directive == "include", false, indent, includedFile, nil}}
}
if m, indent, directive, includedFile := match3(text, `^\.([\t ]*)(s?include)[\t ]+<([^>]+)>[\t ]*(?:#.*)?$`); m {
return &MkLineImpl{line, &mkLineIncludeImpl{directive == "include", true, indent, includedFile, nil}}
}
// XXX: Replace this regular expression with proper parsing.
// There might be a ${VAR:M*.c} in these variables, which the below regular expression cannot handle.
if m, targets, whitespace, sources := match3(text, `^([^\t :]+(?:[\t ]*[^\t :]+)*)([\t ]*):[\t ]*([^#]*?)(?:[\t ]*#.*)?$`); m {
// XXX: This check should be moved somewhere else. NewMkLine should only be concerned with parsing.
if whitespace != "" {
line.Notef("Space before colon in dependency line.")
}
return &MkLineImpl{line, mkLineDependency{targets, sources}}
}
if matches(text, `^(<<<<<<<|=======|>>>>>>>)`) {
return &MkLineImpl{line, nil}
}
// The %q is deliberate here since it shows possible strange characters.
line.Errorf("Unknown Makefile line format: %q.", text)
return &MkLineImpl{line, nil}
}
func (mkline *MkLineImpl) String() string {
return sprintf("%s:%s", mkline.Filename, mkline.Linenos())
}
// IsVarassign returns true for variable assignments of the form VAR=value.
//
// See IsCommentedVarassign.
func (mkline *MkLineImpl) IsVarassign() bool {
data, ok := mkline.data.(mkLineAssign)
return ok && !data.commented
}
// IsCommentedVarassign returns true for commented-out variable assignments.
// In most cases these are treated as ordinary comments, but in some others
// they are treated like variable assignments, just inactive ones.
func (mkline *MkLineImpl) IsCommentedVarassign() bool {
data, ok := mkline.data.(mkLineAssign)
return ok && data.commented
}
// IsShellCommand returns true for tab-indented lines that are assigned to a Make
// target. Example:
//
// pre-configure: # IsDependency
// ${ECHO} # IsShellCommand
func (mkline *MkLineImpl) IsShellCommand() bool {
_, ok := mkline.data.(mkLineShell)
return ok
}
// IsComment returns true for lines that consist entirely of a comment.
func (mkline *MkLineImpl) IsComment() bool {
_, ok := mkline.data.(mkLineComment)
return ok || mkline.IsCommentedVarassign()
}
func (mkline *MkLineImpl) IsEmpty() bool {
_, ok := mkline.data.(mkLineEmpty)
return ok
}
// IsDirective returns true for conditionals (.if/.elif/.else/.if) or loops (.for/.endfor).
//
// See IsInclude.
func (mkline *MkLineImpl) IsDirective() bool {
_, ok := mkline.data.(mkLineDirective)
return ok
}
// IsInclude returns true for lines like: .include "other.mk"
//
// See IsSysinclude for lines like: .include <sys.mk>
func (mkline *MkLineImpl) IsInclude() bool {
incl, ok := mkline.data.(mkLineInclude)
return ok && !incl.sys
}
// IsSysinclude returns true for lines like: .include <sys.mk>
//
// See IsInclude for lines like: .include "other.mk"
func (mkline *MkLineImpl) IsSysinclude() bool {
incl, ok := mkline.data.(mkLineInclude)
return ok && incl.sys
}
// IsDependency returns true for dependency lines like "target: source".
func (mkline *MkLineImpl) IsDependency() bool {
_, ok := mkline.data.(mkLineDependency)
return ok
}
// Varname applies to variable assignments and returns the name
// of the variable that is assigned or appended to.
//
// Example:
// VARNAME.${param}?= value # Varname is "VARNAME.${param}"
func (mkline *MkLineImpl) Varname() string { return mkline.data.(mkLineAssign).varname }
// Varcanon applies to variable assignments and returns the canonicalized variable name for parameterized variables.
// Examples:
// HOMEPAGE => "HOMEPAGE"
// SUBST_SED.anything => "SUBST_SED.*"
// SUBST_SED.${param} => "SUBST_SED.*"
func (mkline *MkLineImpl) Varcanon() string { return mkline.data.(mkLineAssign).varcanon }
// Varparam applies to variable assignments and returns the parameter for parameterized variables.
// Examples:
// HOMEPAGE => ""
// SUBST_SED.anything => "anything"
// SUBST_SED.${param} => "${param}"
func (mkline *MkLineImpl) Varparam() string { return mkline.data.(mkLineAssign).varparam }
// Op applies to variable assignments and returns the assignment operator.
func (mkline *MkLineImpl) Op() MkOperator { return mkline.data.(mkLineAssign).op }
// ValueAlign applies to variable assignments and returns all the text
// before the variable value, e.g. "VARNAME+=\t".
func (mkline *MkLineImpl) ValueAlign() string { return mkline.data.(mkLineAssign).valueAlign }
func (mkline *MkLineImpl) Value() string { return mkline.data.(mkLineAssign).value }
// VarassignComment applies to variable assignments and returns the comment.
//
// Example:
// VAR=value # comment
//
// In the above line, the comment is "# comment".
//
// The leading "#" is included so that pkglint can distinguish between no comment at all and an empty comment.
func (mkline *MkLineImpl) VarassignComment() string { return mkline.data.(mkLineAssign).comment }
func (mkline *MkLineImpl) ShellCommand() string { return mkline.data.(mkLineShell).command }
func (mkline *MkLineImpl) Indent() string {
if mkline.IsDirective() {
return mkline.data.(mkLineDirective).indent
} else {
return mkline.data.(mkLineInclude).indent
}
}
// Directive returns the preprocessing directive, like "if", "for", "endfor", etc.
//
// See matchMkDirective.
func (mkline *MkLineImpl) Directive() string { return mkline.data.(mkLineDirective).directive }
// Args returns the arguments from an .if, .ifdef, .ifndef, .elif, .for, .undef.
func (mkline *MkLineImpl) Args() string { return mkline.data.(mkLineDirective).args }
// Cond applies to an .if or .elif line and returns the parsed condition.
//
// If a parse error occurs, it is silently swallowed, returning a
// best-effort part of the condition, or even nil.
func (mkline *MkLineImpl) Cond() MkCond {
cond := mkline.data.(mkLineDirective).cond
if cond == nil {
cond = NewMkParser(nil, mkline.Args(), false).MkCond()
mkline.data.(mkLineDirective).cond = cond
}
return cond
}
// DirectiveComment is the trailing end-of-line comment, typically at a deeply nested .endif or .endfor.
func (mkline *MkLineImpl) DirectiveComment() string { return mkline.data.(mkLineDirective).comment }
func (mkline *MkLineImpl) HasElseBranch() bool { return mkline.data.(mkLineDirective).elseLine != nil }
func (mkline *MkLineImpl) SetHasElseBranch(elseLine MkLine) {
data := mkline.data.(mkLineDirective)
data.elseLine = elseLine
mkline.data = data
}
func (mkline *MkLineImpl) MustExist() bool { return mkline.data.(mkLineInclude).mustExist }
func (mkline *MkLineImpl) IncludedFile() string { return mkline.data.(mkLineInclude).includedFile }
func (mkline *MkLineImpl) Targets() string { return mkline.data.(mkLineDependency).targets }
func (mkline *MkLineImpl) Sources() string { return mkline.data.(mkLineDependency).sources }
// ConditionalVars applies to .include lines and is a space-separated
// list of those variable names on which the inclusion depends.
// It is initialized later, step by step, when parsing other lines.
func (mkline *MkLineImpl) ConditionalVars() []string {
return mkline.data.(mkLineInclude).conditionalVars
}
func (mkline *MkLineImpl) SetConditionalVars(varnames []string) {
include := mkline.data.(mkLineInclude)
include.conditionalVars = varnames
mkline.data = include
}
// Tokenize extracts variable uses and other text from the given text.
//
// When used in IsVarassign lines, the given text must have the format
// after stripping the end-of-line comment. Such text is available from
// Value. A shell comment is therefore marked by a simple #, not an escaped
// \# like in Makefiles.
//
// When used in IsShellCommand lines, # does not mark a Makefile comment
// and may thus still appear in the text. Therefore, # marks a shell comment.
//
// Example:
// input: ${PREFIX}/bin abc
// output: [MkToken("${PREFIX}", MkVarUse("PREFIX")), MkToken("/bin abc")]
//
// See ValueTokens, which is the tokenized version of Value.
func (mkline *MkLineImpl) Tokenize(text string, warn bool) []*MkToken {
if trace.Tracing {
defer trace.Call(mkline, text)()
}
var tokens []*MkToken
var rest string
if (mkline.IsVarassign() || mkline.IsCommentedVarassign()) && text == mkline.Value() {
tokens, rest = mkline.ValueTokens()
} else {
p := NewMkParser(mkline.Line, text, true)
tokens = p.MkTokens()
rest = p.Rest()
}
if warn && rest != "" {
mkline.Warnf("Internal pkglint error in MkLine.Tokenize at %q.", rest)
}
return tokens
}
// ValueSplit splits the given value, taking care of variable references.
// Example:
//
// ValueSplit("${VAR:Udefault}::${VAR2}two:words", ":")
// => "${VAR:Udefault}"
// ""
// "${VAR2}two"
// "words"
//
// Note that even though the first word contains a colon, it is not split
// at that point since the colon is inside a variable use.
//
// When several separators are adjacent, this results in empty words in the output.
func (mkline *MkLineImpl) ValueSplit(value string, separator string) []string {
G.Assertf(separator != "", "Separator must not be empty; use ValueFields to split on whitespace")
tokens := mkline.Tokenize(value, false)
var split []string
cont := false
out := func(s string) {
if cont {
split[len(split)-1] += s
} else {
split = append(split, s)
}
}
for _, token := range tokens {
if token.Varuse != nil {
out(token.Text)
cont = true
} else {
lexer := textproc.NewLexer(token.Text)
for !lexer.EOF() {
if lexer.SkipString(separator) {
out("")
cont = false
}
idx := strings.Index(lexer.Rest(), separator)
if idx == -1 {
idx = len(lexer.Rest())
}
if idx > 0 {
out(lexer.NextString(lexer.Rest()[:idx]))
cont = true
}
}
}
}
return split
}
// ValueFields splits the given value, taking care of variable references.
// Example:
//
// ValueFields("${VAR:Udefault value} ${VAR2}two words")
// => "${VAR:Udefault value}"
// "${VAR2}two"
// "words"
//
// Note that even though the first word contains a space, it is not split
// at that point since the space is inside a variable use.
func (mkline *MkLineImpl) ValueFields(value string) []string {
tokens := mkline.Tokenize(value, false)
var split []string
cont := false
out := func(s string) {
if cont {
split[len(split)-1] += s
} else {
split = append(split, s)
}
}
for _, token := range tokens {
if token.Varuse != nil {
out(token.Text)
cont = true
} else {
lexer := textproc.NewLexer(token.Text)
for !lexer.EOF() {
for lexer.NextBytesSet(textproc.Space) != "" {
cont = false
}
if word := lexer.NextBytesSet(textproc.Space.Inverse()); word != "" {
out(word)
cont = true
}
}
}
}
return split
}
func (mkline *MkLineImpl) ValueTokens() ([]*MkToken, string) {
value := mkline.Value()
if value == "" {
return nil, ""
}
assign := mkline.data.(mkLineAssign)
if assign.valueMk != nil || assign.valueMkRest != "" {
return assign.valueMk, assign.valueMkRest
}
p := NewMkParser(mkline.Line, value, true)
assign.valueMk = p.MkTokens()
assign.valueMkRest = p.Rest()
return assign.valueMk, assign.valueMkRest
}
// Fields applies to variable assignments and .for loops.
// For variable assignments, it returns the right-hand side, properly split into words.
// For .for loops, it returns all arguments (including variable names), properly split into words.
func (mkline *MkLineImpl) Fields() []string {
if mkline.IsVarassign() {
value := mkline.Value()
if value == "" {
return nil
}
assign := mkline.data.(mkLineAssign)
if assign.fields != nil {
return assign.fields
}
assign.fields = mkline.ValueFields(value)
return assign.fields
}
// For .for loops.
args := mkline.Args()
if args == "" {
return nil
}
directive := mkline.data.(mkLineDirective)
if directive.fields != nil {
return directive.fields
}
directive.fields = mkline.ValueFields(args)
return directive.fields
}
func (mkline *MkLineImpl) WithoutMakeVariables(value string) string {
valueNovar := ""
for _, token := range NewMkParser(nil, value, false).MkTokens() {
if token.Varuse == nil {
valueNovar += token.Text
}
}
return valueNovar
}
func (mkline *MkLineImpl) ResolveVarsInRelativePath(relativePath string) string {
var basedir string
if G.Pkg != nil {
basedir = G.Pkg.File(".")
} else {
basedir = path.Dir(mkline.Filename)
}
tmp := relativePath
if contains(tmp, "PKGSRCDIR") {
pkgsrcdir := relpath(basedir, G.Pkgsrc.File("."))
if G.Testing {
// Relative pkgsrc paths usually only contain two or three levels.
// A possible reason for reaching this assertion is a pkglint unit test
// that uses t.NewMkLines instead of the correct t.SetUpFileMkLines.
G.Assertf(!contains(pkgsrcdir, "../../../../.."),
"Relative path %q for %q is too deep below the pkgsrc root %q.",
pkgsrcdir, basedir, G.Pkgsrc.File("."))
}
tmp = strings.Replace(tmp, "${PKGSRCDIR}", pkgsrcdir, -1)
}
tmp = strings.Replace(tmp, "${.CURDIR}", ".", -1) // TODO: Replace with the "typical" os.Getwd().
tmp = strings.Replace(tmp, "${.PARSEDIR}", ".", -1) // FIXME
replaceLatest := func(varuse, category string, pattern regex.Pattern, replacement string) {
if contains(tmp, varuse) {
latest := G.Pkgsrc.Latest(category, pattern, replacement)
tmp = strings.Replace(tmp, varuse, latest, -1)
}
}
// These variables are only used in pkgsrc packages, therefore they
// are replaced with the fixed "../.." regardless of where the text appears.
replaceLatest("${LUA_PKGSRCDIR}", "lang", `^lua[0-9]+$`, "../../lang/$0")
replaceLatest("${PHPPKGSRCDIR}", "lang", `^php[0-9]+$`, "../../lang/$0")
replaceLatest("${PYPKGSRCDIR}", "lang", `^python[0-9]+$`, "../../lang/$0")
replaceLatest("${PYPACKAGE}", "lang", `^python[0-9]+$`, "$0")
replaceLatest("${SUSE_DIR_PREFIX}", "emulators", `^(suse[0-9]+)_base$`, "$1")
if G.Pkg != nil {
// XXX: Even if these variables are defined indirectly,
// pkglint should be able to resolve them properly.
// There is already G.Pkg.Value, maybe that can be used here.
tmp = strings.Replace(tmp, "${FILESDIR}", G.Pkg.Filesdir, -1)
tmp = strings.Replace(tmp, "${PKGDIR}", G.Pkg.Pkgdir, -1)
}
tmp = cleanpath(tmp)
if trace.Tracing && relativePath != tmp {
trace.Step2("resolveVarsInRelativePath: %q => %q", relativePath, tmp)
}
return tmp
}
func (mkline *MkLineImpl) ExplainRelativeDirs() {
G.Explain(
"Directories in the form \"../../category/package\" make it easier to",
"move a package around in pkgsrc, for example from pkgsrc-wip to the",
"main pkgsrc repository.")
}
// RefTo returns a reference to another line,
// which can be in the same file or in a different file.
//
// If there is a type mismatch when calling this function, try to add ".line" to
// either the method receiver or the other line.
func (mkline *MkLineImpl) RefTo(other MkLine) string {
return mkline.Line.RefTo(other.Line)
}
var (
LowerDash = textproc.NewByteSet("a-z---")
AlnumDot = textproc.NewByteSet("A-Za-z0-9_.")
)
func matchMkDirective(text string) (m bool, indent, directive, args, comment string) {
lexer := textproc.NewLexer(text)
if !lexer.SkipByte('.') {
return
}
indent = lexer.NextHspace()
directive = lexer.NextBytesSet(LowerDash)
switch directive {
case "if", "else", "elif", "endif",
"ifdef", "ifndef",
"for", "endfor", "undef",
"error", "warning", "info",
"export", "export-env", "unexport", "unexport-env":
break
default:
// Intentionally not supported are: ifmake ifnmake elifdef elifndef elifmake elifnmake.
return
}
lexer.SkipHspace()
argsStart := lexer.Mark()
for !lexer.EOF() && lexer.PeekByte() != '#' {
switch {
case lexer.SkipString("[#"):
// See devel/bmake/files/parse.c:/as in modifier/
case lexer.PeekByte() == '\\' && len(lexer.Rest()) > 1:
lexer.Skip(2)
default:
lexer.Skip(1)
}
}
args = lexer.Since(argsStart)
args = strings.TrimFunc(args, func(r rune) bool { return isHspace(byte(r)) })
args = strings.Replace(args, "\\#", "#", -1)
if !lexer.EOF() {
lexer.Skip(1)
lexer.SkipHspace()
comment = lexer.Rest()
}
m = true
return
}
// VariableNeedsQuoting determines whether the given variable needs the :Q operator
// in the given context.
//
// This decision depends on many factors, such as whether the type of the context is
// a list of things, whether the variable is a list, whether it can contain only
// safe characters, and so on.
func (mkline *MkLineImpl) VariableNeedsQuoting(varname string, vartype *Vartype, vuc *VarUseContext) (needsQuoting YesNoUnknown) {
if trace.Tracing {
defer trace.Call(varname, vartype, vuc, trace.Result(&needsQuoting))()
}
// TODO: Systematically test this function, each and every case, from top to bottom.
// TODO: Re-check the order of all these if clauses whether it really makes sense.
vucVartype := vuc.vartype
if vartype == nil || vucVartype == nil || vartype.basicType == BtUnknown {
return unknown
}
if !vartype.basicType.NeedsQ() {
if vartype.kindOfList == lkNone {
if vartype.guessed {
return unknown
}
return no
}
if !vuc.IsWordPart {
return no
}
}
// A shell word may appear as part of a shell word, for example COMPILER_RPATH_FLAG.
if vuc.IsWordPart && vuc.quoting == VucQuotPlain {
if vartype.kindOfList == lkNone && vartype.basicType == BtShellWord {
return no
}
}
// Determine whether the context expects a list of shell words or not.
wantList := vucVartype.IsConsideredList()
haveList := vartype.IsConsideredList()
if trace.Tracing {
trace.Stepf("wantList=%v, haveList=%v", wantList, haveList)
}
// Both of these can be correct, depending on the situation:
// 1. echo ${PERL5:Q}
// 2. xargs ${PERL5}
if !vuc.IsWordPart && wantList && haveList {
return unknown
}
// Pkglint assumes that the tool definitions don't include very
// special characters, so they can safely be used inside any quotes.
if tool := G.ToolByVarname(varname); tool != nil {
switch vuc.quoting {
case VucQuotPlain:
if !vuc.IsWordPart {
return no
}
// XXX: Should there be a return here? It looks as if it could have been forgotten.
case VucQuotBackt:
return no
case VucQuotDquot, VucQuotSquot:
return unknown
}
}
// Variables that appear as parts of shell words generally need to be quoted.
//
// An exception is in the case of backticks, because the whole backticks expression
// is parsed as a single shell word by pkglint. (XXX: This comment may be outdated.)
if vuc.IsWordPart && vucVartype.IsShell() && vuc.quoting != VucQuotBackt {
return yes
}
// SUBST_MESSAGE.perl= Replacing in ${REPLACE_PERL}
if vucVartype.IsPlainString() {
return no
}
if wantList != haveList {
if vucVartype.basicType == BtFetchURL && vartype.basicType == BtHomepage {
return no
}
if vucVartype.basicType == BtHomepage && vartype.basicType == BtFetchURL {
return no // Just for HOMEPAGE=${MASTER_SITE_*:=subdir/}.
}
return yes
}
// Bad: LDADD+= -l${LIBS}
// Good: LDADD+= ${LIBS:S,^,-l,}
if wantList {
return yes
}
if trace.Tracing {
trace.Step1("Don't know whether :Q is needed for %q", varname)
}
return unknown
}
func (mkline *MkLineImpl) DetermineUsedVariables() []string {
// TODO: It would be good to have these variables as MkVarUse objects
// including the context in which they are used.
var varnames []string
add := func(varname string) {
varnames = append(varnames, varname)
}
var searchIn func(text string) // mutually recursive with searchInVarUse
searchInVarUse := func(varuse *MkVarUse) {
varname := varuse.varname
if !varuse.IsExpression() {
add(varname)
}
searchIn(varname)
for _, mod := range varuse.modifiers {
searchIn(mod.Text)
}
}
searchIn = func(text string) {
if !contains(text, "$") {
return
}
for _, token := range NewMkParser(nil, text, false).MkTokens() {
if token.Varuse != nil {
searchInVarUse(token.Varuse)
}
}
}
switch {
case mkline.IsVarassign():
searchIn(mkline.Varname())
searchIn(mkline.Value())
case mkline.IsDirective() && mkline.Directive() == "for":
searchIn(mkline.Args())
case mkline.IsDirective() && mkline.Cond() != nil:
mkline.Cond().Walk(&MkCondCallback{VarUse: searchInVarUse})
case mkline.IsShellCommand():
searchIn(mkline.ShellCommand())
case mkline.IsDependency():
searchIn(mkline.Targets())
searchIn(mkline.Sources())
case mkline.IsInclude():
searchIn(mkline.IncludedFile())
}
return varnames
}
func (mkline *MkLineImpl) UnquoteShell(str string) string {
var sb strings.Builder
n := len(str)
outer:
for i := 0; i < n; i++ {
switch str[i] {
case '"':
for i++; i < n; i++ {
switch str[i] {
case '"':
continue outer
case '\\':
i++
if i < n {
sb.WriteByte(str[i])
}
default:
sb.WriteByte(str[i])
}
}
case '\'':
for i++; i < n && str[i] != '\''; i++ {
sb.WriteByte(str[i])
}
case '\\':
i++
if i < n {
sb.WriteByte(str[i])
}
default:
sb.WriteByte(str[i])
}
}
return sb.String()
}
type MkOperator uint8
const (
opAssign MkOperator = iota // =
opAssignShell // !=
opAssignEval // :=
opAssignAppend // +=
opAssignDefault // ?=
opUseCompare // A variable is compared to a value, e.g. in a condition.
opUseMatch // A variable is matched using the :M or :N modifier.
)
func NewMkOperator(op string) MkOperator {
switch op {
case "=":
return opAssign
case "!=":
return opAssignShell
case ":=":
return opAssignEval
case "+=":
return opAssignAppend
case "?=":
return opAssignDefault
}
panic("Invalid operator: " + op)
}
func (op MkOperator) String() string {
return [...]string{"=", "!=", ":=", "+=", "?=", "use", "use-loadtime", "use-match"}[op]
}
// VarUseContext defines the context in which a variable is defined
// or used. Whether that is allowed depends on:
//
// * The variable's data type, as defined in vardefs.go.
//
// * When used on the right-hand side of an assigment, the variable can
// represent a list of words, a single word or even only part of a
// word. This distinction decides upon the correct use of the :Q
// operator.
//
// * When used in preprocessing statements like .if or .for, the other
// operands of that statement should fit to the variable and are
// checked against the variable type. For example, comparing OPSYS to
// x86_64 doesn't make sense.
type VarUseContext struct {
vartype *Vartype
time vucTime
quoting VucQuoting
IsWordPart bool // Example: LOCALBASE=${LOCALBASE}
}
// vucTime is the time at which a variable is used.
//
// See ToolTime, which is the same except that there is no unknown.
type vucTime uint8
const (
vucTimeUnknown vucTime = iota
// When Makefiles are loaded, the operators := and != evaluate their
// right-hand side, as well as the directives .if, .elif and .for.
// During loading, not all variables are available yet.
// Variable values are still subject to change, especially lists.
vucTimeParse
// All files have been read, all variables can be referenced.
// Variable values don't change anymore.
//
// Well, except for the ::= modifier.
// But that modifier is usually not used in pkgsrc.
vucTimeRun
)
func (t vucTime) String() string { return [...]string{"unknown", "parse", "run"}[t] }
// VucQuoting describes in what level of quoting the variable is used.
// Depending on this context, the modifiers :Q or :M can be allowed or not.
//
// The shell tokenizer knows multi-level quoting modes (see ShQuoting),
// but for deciding whether :Q is necessary or not, a single level is enough.
type VucQuoting uint8
const (
VucQuotUnknown VucQuoting = iota
VucQuotPlain // Example: echo LOCALBASE=${LOCALBASE}
VucQuotDquot // Example: echo "The version is ${PKGVERSION}."
VucQuotSquot // Example: echo 'The version is ${PKGVERSION}.'
VucQuotBackt // Example: echo `sed 1q ${WRKSRC}/README`
)
func (q VucQuoting) String() string {
return [...]string{"unknown", "plain", "dquot", "squot", "backt", "mk-for"}[q]
}
func (vuc *VarUseContext) String() string {
typename := "no-type"
if vuc.vartype != nil {
typename = vuc.vartype.String()
}
return sprintf("(%s time:%s quoting:%s wordpart:%v)", typename, vuc.time, vuc.quoting, vuc.IsWordPart)
}
// Indentation remembers the stack of preprocessing directives and their
// indentation. By convention, each directive is indented by 2 spaces.
// An excepting are multiple-inclusion guards, they don't increase the
// indentation.
type Indentation struct {
levels []indentationLevel
}
func NewIndentation() *Indentation {
ind := Indentation{}
ind.Push(nil, 0, "") // Dummy
return &ind
}
func (ind *Indentation) String() string {
var s strings.Builder
for _, level := range ind.levels[1:] {
_, _ = fmt.Fprintf(&s, " %d", level.depth)
if len(level.conditionalVars) > 0 {
_, _ = fmt.Fprintf(&s, " (%s)", strings.Join(level.conditionalVars, " "))
}
}
return "[" + trimHspace(s.String()) + "]"
}
func (ind *Indentation) RememberUsedVariables(cond MkCond) {
cond.Walk(&MkCondCallback{
VarUse: func(varuse *MkVarUse) { ind.AddVar(varuse.varname) }})
}
type indentationLevel struct {
mkline MkLine // The line in which the indentation started; the .if/.for
depth int // Number of space characters; always a multiple of 2
args string // The arguments from the .if or .for, or the latest .elif
conditionalVars []string // Variables on which the current path depends
// Files whose existence has been checked in an if branch that is
// related to the current indentation. After a .if exists(fname),
// pkglint will happily accept .include "fname" in both the then and
// the else branch. This is ok since the primary job of this file list
// is to prevent wrong pkglint warnings about missing files.
checkedFiles []string
}
func (ind *Indentation) Len() int {
return len(ind.levels)
}
func (ind *Indentation) top() *indentationLevel {
return &ind.levels[ind.Len()-1]
}
// Depth returns the number of space characters by which the directive
// should be indented.
//
// This is typically two more than the surrounding level, except for
// multiple-inclusion guards.
func (ind *Indentation) Depth(directive string) int {
switch directive {
case "if", "elif", "else", "endfor", "endif":
return ind.levels[imax(0, ind.Len()-2)].depth
}
return ind.top().depth
}
func (ind *Indentation) Pop() {
ind.levels = ind.levels[:ind.Len()-1]
}
func (ind *Indentation) Push(mkline MkLine, indent int, condition string) {
ind.levels = append(ind.levels, indentationLevel{mkline, indent, condition, nil, nil})
}
// AddVar remembers that the current indentation depends on the given variable,
// most probably because that variable is used in a .if directive.
//
// Variables named *_MK are ignored since they are usually not interesting.
func (ind *Indentation) AddVar(varname string) {
if hasSuffix(varname, "_MK") {
return
}
vars := &ind.top().conditionalVars
for _, existingVarname := range *vars {
if varname == existingVarname {
return
}
}
*vars = append(*vars, varname)
}
func (ind *Indentation) DependsOn(varname string) bool {
for _, level := range ind.levels {
for _, levelVarname := range level.conditionalVars {
if varname == levelVarname {
return true
}
}
}
return false
}
// IsConditional returns whether the current line depends on evaluating
// any variable in an .if or .elif expression or from a .for loop.
//
// Variables named *_MK are excluded since they are usually not interesting.
func (ind *Indentation) IsConditional() bool {
for _, level := range ind.levels {
if len(level.conditionalVars) > 0 {
return true
}
}
return false
}
// Varnames returns the list of all variables that are mentioned in any
// condition or loop surrounding the current line.
//
// Variables named *_MK are excluded since they are usually not interesting.
func (ind *Indentation) Varnames() []string {
var varnames []string
for _, level := range ind.levels {
for _, levelVarname := range level.conditionalVars {
G.Assertf(
!hasSuffix(levelVarname, "_MK"),
"multiple-inclusion guard must be filtered out earlier.")
varnames = append(varnames, levelVarname)
}
}
return varnames
}
// Args returns the arguments of the innermost .if, .elif or .for.
func (ind *Indentation) Args() string {
return ind.top().args
}
func (ind *Indentation) AddCheckedFile(filename string) {
top := ind.top()
top.checkedFiles = append(top.checkedFiles, filename)
}
func (ind *Indentation) IsCheckedFile(filename string) bool {
for _, level := range ind.levels {
for _, levelFilename := range level.checkedFiles {
if filename == levelFilename {
return true
}
}
}
return false
}
func (ind *Indentation) TrackBefore(mkline MkLine) {
if !mkline.IsDirective() {
return
}
if trace.Tracing {
trace.Stepf("Indentation before line %s: %s", mkline.Linenos(), ind)
}
switch mkline.Directive() {
case "for", "if", "ifdef", "ifndef":
ind.Push(mkline, ind.top().depth, mkline.Args())
}
}
func (ind *Indentation) TrackAfter(mkline MkLine) {
if !mkline.IsDirective() {
return
}
directive := mkline.Directive()
args := mkline.Args()
switch directive {
case "if":
cond := mkline.Cond()
// For multiple-inclusion guards, the indentation stays at the same level.
guard := cond != nil && cond.Not != nil && hasSuffix(cond.Not.Defined, "_MK")
if !guard {
ind.top().depth += 2
}
case "for", "ifdef", "ifndef":
ind.top().depth += 2
case "elif":
// Handled here instead of TrackBefore to allow the action to access the previous condition.
ind.top().args = args
case "else":
top := ind.top()
if top.mkline != nil {
top.mkline.SetHasElseBranch(mkline)
}
case "endfor", "endif":
if ind.Len() > 1 { // Can only be false in unbalanced files.
ind.Pop()
}
}
switch directive {
case "if", "elif":
cond := mkline.Cond()
if cond == nil {
break
}
ind.RememberUsedVariables(cond)
cond.Walk(&MkCondCallback{
Call: func(name string, arg string) {
if name == "exists" {
ind.AddCheckedFile(arg)
}
}})
}
if trace.Tracing {
trace.Stepf("Indentation after line %s: %s", mkline.Linenos(), ind)
}
}
func (ind *Indentation) CheckFinish(filename string) {
if ind.Len() <= 1 {
return
}
eofLine := NewLineEOF(filename)
for ind.Len() > 1 {
openingMkline := ind.levels[ind.Len()-1].mkline
eofLine.Errorf(".%s from %s must be closed.", openingMkline.Directive(), eofLine.RefTo(openingMkline.Line))
ind.Pop()
}
}
// VarnameBytes contains characters that may be used in variable names.
// The bracket is included only for the tool of the same name, e.g. "TOOLS_PATH.[".
//
// This approach differs from the one in devel/bmake/files/parse.c:/^Parse_IsVar,
// but in practice it works equally well. Luckily there aren't many situations
// where a complicated variable name contains unbalanced parentheses or braces,
// which would confuse the devel/bmake parser.
var VarnameBytes = textproc.NewByteSet("A-Za-z_0-9*+---.[")
func MatchVarassign(text string) (m, commented bool, varname, spaceAfterVarname, op, valueAlign, value, spaceAfterValue, comment string) {
lexer := textproc.NewLexer(text)
commented = lexer.SkipByte('#')
for !commented && lexer.SkipByte(' ') {
}
varnameStart := lexer.Mark()
for !lexer.EOF() {
switch {
case lexer.NextBytesSet(VarnameBytes) != "":
continue
case lexer.PeekByte() == '$':
parser := NewMkParser(nil, lexer.Rest(), false)
varuse := parser.VarUse()
if varuse == nil {
return
}
varuseLen := len(lexer.Rest()) - len(parser.Rest())
lexer.Skip(varuseLen)
continue
}
break
}
varname = lexer.Since(varnameStart)
if varname == "" {
return
}
spaceAfterVarname = lexer.NextHspace()
opStart := lexer.Mark()
switch lexer.PeekByte() {
case '!', '+', ':', '?':
lexer.Skip(1)
}
if !lexer.SkipByte('=') {
return
}
op = lexer.Since(opStart)
if hasSuffix(varname, "+") && op == "=" && spaceAfterVarname == "" {
varname = varname[:len(varname)-1]
op = "+="
}
lexer.SkipHspace()
valueAlign = text[:len(text)-len(lexer.Rest())]
valueStart := lexer.Mark()
// FIXME: This is the same code as in matchMkDirective.
for !lexer.EOF() && lexer.PeekByte() != '#' {
switch {
case lexer.SkipString("[#"):
break
case lexer.PeekByte() == '\\' && len(lexer.Rest()) > 1:
lexer.Skip(2)
default:
lexer.Skip(1)
}
}
rawValueWithSpace := lexer.Since(valueStart)
spaceAfterValue = rawValueWithSpace[len(strings.TrimRight(rawValueWithSpace, " \t")):]
value = trimHspace(strings.Replace(lexer.Since(valueStart), "\\#", "#", -1))
comment = lexer.Rest()
m = true
return
}
func MatchMkInclude(text string) (m bool, indentation, directive, filename string) {
lexer := textproc.NewLexer(text)
if lexer.SkipByte('.') {
indentation = lexer.NextHspace()
directive = lexer.NextString("include")
if directive == "" {
directive = lexer.NextString("sinclude")
}
if directive != "" {
lexer.NextHspace()
if lexer.SkipByte('"') {
// Note: strictly speaking, the full MkVarUse would have to be parsed
// here. But since these usually don't contain double quotes, it has
// worked fine up to now.
filename = lexer.NextBytesFunc(func(c byte) bool { return c != '"' })
if filename != "" && lexer.SkipByte('"') {
lexer.NextHspace()
if lexer.EOF() || lexer.SkipByte('#') {
m = true
return
}
}
}
}
}
return false, "", "", ""
}
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