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package main
type StringSegmentPathFilterAST struct {
index string
}
func (ast StringSegmentPathFilterAST) compileWith(next PathFilterState) PathFilterState {
return StringSegmentPathFilter {
index: ast.index,
next: next,
}
}
type IntegerSegmentPathFilterAST struct {
index int
}
func (ast IntegerSegmentPathFilterAST) compileWith(next PathFilterState) PathFilterState {
return IntegerSegmentPathFilter {
index: ast.index,
next: next,
}
}
type RepeatPathFilterAST struct {
content PathFilterAST
}
func (ast RepeatPathFilterAST) compileWith(next PathFilterState) PathFilterState {
nextGroup := &GroupPathFilter{}
repeatStart := ast.content.compileWith(nextGroup)
nextGroup.filters = []PathFilterState{next, repeatStart}
return nextGroup
}
type SequencePathFilterAST struct {
sequence []PathFilterAST
}
func (ast SequencePathFilterAST) compileWith(next PathFilterState) PathFilterState {
for i := len(ast.sequence) - 1; i >= 0; i -= 1 {
next = ast.sequence[i].compileWith(next)
}
return next
}
type AnySegmentPathFilterAST struct {}
func (ast AnySegmentPathFilterAST) compileWith(next PathFilterState) PathFilterState {
return AnySegmentPathFilter{next: next}
}
type PathFilterAST interface {
compileWith(PathFilterState) PathFilterState
}
func compilePathFilterAST(ast PathFilterAST) PathFilter {
return PathFilter{
initial: ast.compileWith(NonePathFilter{}),
}
}
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