Refactors some stuff and adds lexing and parsing

1 files changed, 56 insertions, 0 deletions

diff --git a/main/pathfilterast.go b/main/pathfilterast.go
new file mode 100644
index 0000000..c2ddc7f
--- /dev/null
+++ b/main/pathfilterast.go
@@ -0,0 +1,56 @@
+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{}),
+	}
+}