新版IP库管理阶段性提交（未完成）

pkg/iplibrary/parser.go

@@ -0,0 +1,64 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package iplibrary
+
+import (
+	"bytes"
+	"errors"
+)
+
+type Parser struct {
+	config *ParserConfig
+
+	data []byte
+}
+
+func NewParser(config *ParserConfig) (*Parser, error) {
+	if config == nil {
+		config = &ParserConfig{}
+	}
+
+	if config.Template == nil {
+		return nil, errors.New("template must not be nil")
+	}
+
+	return &Parser{
+		config: config,
+	}, nil
+}
+
+func (this *Parser) Write(data []byte) {
+	this.data = append(this.data, data...)
+}
+
+func (this *Parser) Parse() error {
+	if len(this.data) == 0 {
+		return nil
+	}
+	for {
+		var index = bytes.IndexByte(this.data, '\n')
+		if index >= 0 {
+			var line = this.data[:index+1]
+			values, found := this.config.Template.Extract(string(line), this.config.EmptyValues)
+			if found {
+				if this.config.Iterator != nil {
+					err := this.config.Iterator(values)
+					if err != nil {
+						return err
+					}
+				}
+			} else {
+				// 防止错误信息太长
+				if len(line) > 256 {
+					line = line[:256]
+				}
+				return errors.New("invalid line '" + string(line) + "'")
+			}
+
+			this.data = this.data[index+1:]
+		} else {
+			break
+		}
+	}
+	return nil
+}