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Former-commit-id: 3cfe87da405d0ff749e1a1010660c556b047f333

_future/path_parser.go

@@ -0,0 +1,73 @@
+package router
+
+import (
+	"fmt"
+)
+
+type PathTmpl struct {
+	Params         []PathParamTmpl
+	SegmentsLength int
+}
+
+type PathParamTmpl struct {
+	SegmentIndex int
+	Param        ParamTmpl
+}
+
+const (
+	PathSeparator = '/'
+	// Out means that it doesn't being included in param.
+	ParamStartOut = '{'
+	ParamEndOut   = '}'
+)
+
+// /users/{id:int range(1,5)}/profile
+// parses only the contents inside {}
+// but it gives back the position so it will be '1'
+func ParsePath(source string) (*PathTmpl, error) {
+	t := new(PathTmpl)
+	cursor := 0
+	segmentIndex := -1
+
+	// error if path is empty
+	if len(source) < 1 {
+		return nil, fmt.Errorf("source cannot be empty ")
+	}
+	// error if not starts with '/'
+	if source[0] != PathSeparator {
+		return nil, fmt.Errorf("source '%s' should start with a path separator(%q)", source, PathSeparator)
+	}
+	// if path ends with '/' remove the last '/'
+	if source[len(source)-1] == PathSeparator {
+		source = source[0 : len(source)-1]
+	}
+
+	for i := range source {
+		if source[i] == PathSeparator {
+			segmentIndex++
+			t.SegmentsLength++
+			continue
+		}
+
+		if source[i] == ParamStartOut {
+			cursor = i + 1
+			continue
+		}
+
+		if source[i] == ParamEndOut {
+			// take the left part id:int range(1,5)
+			paramSource := source[cursor:i]
+			paramTmpl, err := ParseParam(paramSource)
+			if err != nil {
+				return nil, err
+			}
+
+			t.Params = append(t.Params, PathParamTmpl{SegmentIndex: segmentIndex, Param: *paramTmpl})
+
+			cursor = i + 1
+			continue
+		}
+	}
+
+	return t, nil
+}