func CollectLValues(node build.Expr) []*build.Ident
CollectLValues returns the list of identifiers that are assigned (assuming that node is a valid LValue). For example, it returns `a`, `b` and `c` for the input `a, (b, c)`.
func WalkOnceWithEnvironment(node build.Expr, env *Environment, fct func(e *build.Expr, env *Environment))
WalkOnceWithEnvironment calls fct on every child of node, while maintaining the Environment of all available symbols.
Environment represents a static environment (e.g. information about all available symbols).
type Environment struct {
Blocks []block
Function *build.DefStmt // enclosing function (or nil on top-level)
Stack []build.Expr // parents of the current node
// contains filtered or unexported fields
}
func NewEnvironment() *Environment
NewEnvironment creates a new empty Environment.
func (e *Environment) Get(name string) *NameInfo
Get resolves the name and resolves information about the binding (or nil if it's not defined).
NameInfo represents information about a symbol name.
type NameInfo struct {
ID int // unique identifier
Name string // name of the variable (not unique)
Kind ValueKind
Definition build.Expr // node that defines the value
}
ValueKind describes how a binding was declared.
type ValueKind int
List of ValueKind values.
const (
Builtin ValueKind = iota // language builtin
Imported // declared with load()
Global // declared with assignment on top-level
Function // declared with a def
Parameter // function parameter
Local // local variable, defined with assignment or as a loop variable
)
func (k ValueKind) String() string