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package pkglint
//go:generate goyacc -o shellyacc.go -v shellyacc.log -p shyy shell.y
type ShAtomType uint8
const (
shtSpace ShAtomType = iota
shtVaruse // ${PREFIX}
shtShVarUse // $${var:-pol}
shtText // while, cat, ENV=value
shtOperator // (, ;, |
shtComment // # ...
shtSubshell // $$(
)
func (t ShAtomType) String() string {
return [...]string{
"space",
"varuse",
"shvaruse",
"text",
"operator",
"comment",
"subshell",
}[t]
}
// IsWord checks whether the atom counts as text.
// Makefile variables, shell variables and other text counts,
// but keywords, operators and separators don't.
func (t ShAtomType) IsWord() bool {
switch t {
case shtVaruse, shtShVarUse, shtText:
return true
}
return false
}
type ShAtom struct {
Type ShAtomType
MkText string
Quoting ShQuoting // The quoting state at the end of the token
// * usually nil
// * for shtVaruse a *MkVarUse
// * for shtShVarUse a string
data interface{}
}
func (atom *ShAtom) String() string {
if atom.Type == shtText && atom.Quoting == shqPlain {
return sprintf("%q", atom.MkText)
}
if atom.Type == shtVaruse {
varuse := atom.VarUse()
return sprintf("varuse(%q)", varuse.varname+varuse.Mod())
}
return sprintf("ShAtom(%v, %q, %s)", atom.Type, atom.MkText, atom.Quoting)
}
// VarUse returns a read access to a Makefile variable, or nil for plain shell tokens.
func (atom *ShAtom) VarUse() *MkVarUse {
if atom.Type == shtVaruse {
return atom.data.(*MkVarUse)
}
return nil
}
// ShVarname applies to shell variable atoms like $$varname or $${varname:-modifier}
// and returns the name of the shell variable.
func (atom *ShAtom) ShVarname() string {
return atom.data.(string)
}
// ShQuoting describes the context in which a string appears
// and how it must be unescaped to get its literal value.
type ShQuoting uint8
const (
shqPlain ShQuoting = iota // e.g. word
shqDquot // e.g. "word"
shqSquot // e.g. 'word'
shqBackt // e.g. `word`
shqSubsh // e.g. $(word)
shqDquotBackt // e.g. "`word`"
shqBacktDquot // e.g. `"word"`
shqBacktSquot // e.g. `'word'`
shqSubshDquot // e.g. $("word")
shqSubshSquot // e.g. $('word')
shqSubshBackt // e.g. $(`word`)
shqDquotBacktDquot // e.g. "`"word"`"
shqDquotBacktSquot // e.g. "`'word'`"
)
// String returns a very short identifier for the quoting state.
// In this, d means double quotes, s means single quotes,
// b means backticks and S means subshell.
func (q ShQuoting) String() string {
return [...]string{
"plain",
"d", "s", "b", "S",
"db", "bd", "bs", "Sd", "Ss", "Sb",
"dbd", "dbs",
}[q]
}
func (q ShQuoting) ToVarUseContext() VucQuoting {
switch q {
case shqPlain:
return VucQuotPlain
case shqDquot:
return VucQuotDquot
case shqSquot:
return VucQuotSquot
case shqBackt:
return VucQuotBackt
}
return VucQuotUnknown
}
// ShToken is an operator or a keyword or some text intermingled with variables.
//
// Examples:
// ;
// then
// "The number of pkgsrc packages in ${PREFIX} is $$packages."
//
// See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_10_02
type ShToken struct {
MkText string // The text as it appeared in the Makefile, after replacing `\#` with `#`
Atoms []*ShAtom
}
func NewShToken(mkText string, atoms ...*ShAtom) *ShToken {
assert(mkText != "")
assert(len(atoms) > 0)
return &ShToken{mkText, atoms}
}
func (token *ShToken) String() string {
return sprintf("ShToken(%v)", token.Atoms)
}
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