This repository has been archived on 2024-02-27. You can view files and clone it, but cannot push or open issues or pull requests.
arf/analyzer/type.go

112 lines
2.4 KiB
Go

package analyzer
// import "git.tebibyte.media/arf/arf/types"
import "git.tebibyte.media/arf/arf/parser"
import "git.tebibyte.media/arf/arf/infoerr"
// TypeKind represents what kind of type a type is.
type TypeKind int
const (
// TypeKindBasic means it's a single value.
TypeKindBasic TypeKind = iota
// TypeKindPointer means it's a pointer
TypeKindPointer
// TypeKindVariableArray means it's an array of variable length.
TypeKindVariableArray
// TypeKindObject means it's a structured type with members.
TypeKindObject
)
// Type represents a description of a type. It must eventually point to a
// TypeSection.
type Type struct {
// one of these must be nil.
actual Section
points *Type
mutable bool
kind TypeKind
// if this is greater than 1, it means that this is a fixed-length array
// of whatever the type is. even if the type is a variable length array.
// because literally why not.
length uint64
}
// ToString returns all data stored within the type, in string form.
func (what Type) ToString (indent int) (output string) {
output += doIndent(indent, "type ", what.length)
if what.mutable {
output += " mutable"
}
switch what.kind {
case TypeKindBasic:
output += " basic"
case TypeKindPointer:
output += " pointer"
case TypeKindVariableArray:
output += " variableArray"
case TypeKindObject:
output += " object"
}
if what.points != nil {
output += " {\n"
output += what.points.ToString(indent + 1)
output += doIndent(indent, "}")
}
if what.actual != nil {
output += " " + what.actual.Name()
}
output += "\n"
return
}
// analyzeType analyzes a type specifier.
func (analyzer AnalysisOperation) analyzeType (
inputType parser.Type,
) (
outputType Type,
err error,
) {
outputType.mutable = inputType.Mutable()
outputType.length = inputType.Length()
if outputType.length < 1 {
err = inputType.NewError (
"cannot specify a length of zero",
infoerr.ErrorKindError)
return
}
// analyze type this type points to, if it exists
if inputType.Kind() != parser.TypeKindBasic {
var points Type
points, err = analyzer.analyzeType(inputType.Points())
outputType.points = &points
} else {
var bitten parser.Identifier
outputType.actual,
bitten,
err = analyzer.fetchSectionFromIdentifier(inputType.Name())
if bitten.Length() > 0 {
err = bitten.NewError(
"cannot use member selection in this context",
infoerr.ErrorKindError)
return
}
}
// TODO
return
}