reflection work so far...

internal/constmap/funcs.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	`errors`
+	`go/ast`
+	`go/token`
+	`log`
+	`strings`
+
+	`github.com/oriser/regroup`
+)
+
+/*
+	getParamSpec takes an ast.Decl d and returns a slice of
+	ParamConst found in it.
+
+	If no ParamConst are found, foundParams will be nil.
+*/
+func getValueSpec(d ast.Decl) (foundParams []*ParamConst) {
+
+	var ok bool
+	var idx int
+	var gd *ast.GenDecl
+	var spec ast.Spec
+	var vs *ast.ValueSpec
+	var vsId *ast.Ident
+	var nm *ast.Ident
+	var bl *ast.BasicLit
+
+	if gd, ok = d.(*ast.GenDecl); !ok || gd.Tok != token.CONST {
+		return
+	}
+
+	for _, spec = range gd.Specs {
+		if vs, ok = spec.(*ast.ValueSpec); !ok {
+			continue
+		}
+		if vs.Type != nil {
+			if vsId, ok = vs.Type.(*ast.Ident); !ok || vsId.Name != matchType {
+				continue
+			}
+		}
+		for idx, nm = range vs.Names {
+			if !strings.HasPrefix(nm.Name, pfx) {
+				continue
+			}
+			if bl, ok = vs.Values[idx].(*ast.BasicLit); !ok {
+				continue
+			}
+
+			foundParams = append(
+				foundParams,
+				&ParamConst{
+					ConstName: nm.Name,
+					// UriParamName: bl.Value,
+					UriParamName: stripQuotes(bl.Value),
+				},
+			)
+		}
+	}
+
+	return
+}
+
+/*
+	stripQuotes removes Golang-AST defining quotes.
+	This probably doesn't work for multiline, but should be fine for our purposes.
+*/
+func stripQuotes(inStr string) (outStr string) {
+
+	var err error
+	var matches map[string]string
+	var nomchErr *regroup.NoMatchFoundError = new(regroup.NoMatchFoundError)
+
+	outStr = inStr
+
+	if matches, err = stripQuotesPtrn.Groups(inStr); err != nil {
+		if errors.As(err, &nomchErr) {
+			err = nil
+			return
+		} else {
+			log.Panicln(err)
+		}
+	}
+
+	for _, v := range matches {
+		if v != "" {
+			outStr = v
+			return
+		}
+	}
+
+	return
+}