#136: Start working on database persistence

vendor/modernc.org/ccgo/v3/lib/etc.go

@@ -0,0 +1,110 @@
+// Copyright 2020 The CCGO Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ccgo // import "modernc.org/ccgo/v3/lib"
+
+import (
+	"fmt"
+	"math"
+	"math/big"
+
+	"modernc.org/cc/v3"
+)
+
+var (
+	reservedNames = map[string]bool{
+		"bool":        false, // ccgo can use
+		"break":       true,  // keyword
+		"case":        true,  // keyword
+		"chan":        true,  // keyword
+		"const":       true,  // keyword
+		"continue":    true,  // keyword
+		"default":     true,  // keyword
+		"defer":       true,  // keyword
+		"else":        true,  // keyword
+		"fallthrough": true,  // keyword
+		"false":       false, // ccgo can use
+		"float32":     false, // ccgo can use
+		"float64":     false, // ccgo can use
+		"for":         true,  // keyword
+		"func":        true,  // keyword
+		"go":          true,  // keyword
+		"goto":        true,  // keyword
+		"if":          true,  // keyword
+		"import":      true,  // keyword
+		"init":        false, // special name
+		"int16":       false, // ccgo can use
+		"int32":       false, // ccgo can use
+		"int64":       false, // ccgo can use
+		"int8":        false, // ccgo can use
+		"interface":   true,  // keyword
+		"map":         true,  // keyword
+		"math":        false, // package name
+		"nil":         false, // ccgo can use
+		"package":     true,  // keyword
+		"range":       true,  // keyword
+		"return":      true,  // keyword
+		"select":      true,  // keyword
+		"struct":      true,  // keyword
+		"switch":      true,  // keyword
+		"true":        false, // ccgo can use
+		"type":        true,  // keyword
+		"types":       false, // package name
+		"uint16":      false, // ccgo can use
+		"uint32":      false, // ccgo can use
+		"uint64":      false, // ccgo can use
+		"uint8":       false, // ccgo can use
+		"uintptr":     false, // ccgo can use
+		"unsafe":      false, // package name
+		"var":         true,  // keyword
+	}
+
+	reservedIds []cc.StringID
+
+	maxInt32  = big.NewInt(math.MaxInt32)
+	maxInt64  = big.NewInt(math.MaxInt64)
+	maxUint32 = big.NewInt(math.MaxUint32)
+	maxUint64 = big.NewInt(0).SetUint64(math.MaxUint64)
+	minInt32  = big.NewInt(math.MinInt32)
+	minInt64  = big.NewInt(math.MinInt64)
+)
+
+func init() {
+	for k := range reservedNames {
+		reservedIds = append(reservedIds, cc.String(k))
+	}
+}
+
+type scope map[cc.StringID]int32
+
+func newScope() scope {
+	s := scope{}
+	for _, k := range reservedIds {
+		s[k] = 0
+	}
+	return s
+}
+
+func (s scope) take(t cc.StringID) string {
+	if t == 0 {
+		panic(todo("internal error"))
+	}
+
+	n, ok := s[t]
+	if !ok {
+		s[t] = 0
+		return t.String()
+	}
+
+	for {
+		n++
+		s[t] = n
+		r := fmt.Sprintf("%s%d", t, n)
+		id := cc.String(r)
+		if _, ok := s[id]; !ok {
+			s[id] = 0
+			return r
+		}
+	}
+}