// 配备并重新组合查询语句, 给出QCnd对象
func (qb *QWBuilder) evalQCnd(fld string) *QCnd {
for _, rule := range qb.Rules {
if rule.Regex.MatchString(fld) {
z.DebugPrintf("fld [%s] match regex [%s]\n", fld, rule.Regex.String())
groups := rule.Regex.FindStringSubmatch(fld)
for _, grp := range groups {
z.DebugPrintf(" g_%s\n", grp)
}
extractStr := z.Trim(findMatchStr(rule.Seg, groups))
// 生成QCnd
qc := new(QCnd)
qc.Key = rule.Key
qc.Origin = fld
qc.Plain = extractStr
qc.Type = rule.Type
switch qc.Type {
case String:
qc.Value = extractStr
case Regex:
qc.Value = regexp.MustCompile(extractStr)
case IntRegion, LongRegion, DateRegion:
qc.Value = z.MakeRegion(extractStr)
case StringEnum:
senum := extractStr[1 : len(extractStr)-1]
qc.Value = z.SplitIgnoreBlank(senum, ",")
case IntEnum:
ienum := extractStr[1 : len(extractStr)-1]
iarray := make([]int, 0, 5)
for _, ie := range z.SplitIgnoreBlank(ienum, ",") {
ione, _ := strconv.Atoi(ie)
iarray = append(iarray, ione)
}
qc.Value = iarray
case Json:
jmap := new(map[string]interface{})
jerr := z.JsonFromString(extractStr, jmap)
if jerr != nil {
qc.Value = jmap
}
default:
// unsupport
qc.Value = nil
}
return qc
}
}
z.DebugPrintf("fld [%s] miss match\n", fld)
return nil
}
// 提取查询语句与连接符
func (qb *QWBuilder) extractFldsAndSeps(kwd string) (isGOr, isGAnd bool, flds []string, seps []byte) {
// 判断全局参数 (先强制认为 'xxx:')
// FIXME 后面改成正则匹配, 可以多加空格
isGOr = strings.HasPrefix(kwd, qb.GOr+":")
isGAnd = strings.HasPrefix(kwd, qb.GAnd+":")
if isGOr || isGAnd {
kwd = kwd[strings.Index(kwd, ":")+1:]
}
// 分割查询字符串
flds = make([]string, 0, 5)
seps = make([]byte, 0, 5)
// FIXME 这个地方需要在好好想想
// 保证一个特殊情况下的正确性, 比如或是" "与是"," kwd中有类似"xxx , yyy"这样的语句,需要把处理
// 这个特例是一搬在" "当做或的情况下
if z.IsInStrings(qb.SepOr, " ") {
for _, sAnd := range qb.SepAnd {
ss := " " + sAnd + " "
kwd = strings.Replace(kwd, ss, sAnd, -1)
}
}
// 开始解析
kszie := len(kwd)
fld := z.StringBuilder()
for i := 0; i < kszie; i++ {
c := kwd[i]
z.DebugPrintf("extract kwd %3d -> [%s]\n", i, string(c))
// 如果是引用
if pos := z.IndexOfStrings(qb.QuoteBegin, string(c)); pos > 0 {
// 这里面的空格啥的就不会被跳过了, 会一直取到引用结束, 逃逸字符会调整一下
for i++; i < kszie; i++ {
c = kwd[i]
if string(c) == qb.QuoteEnd[pos] {
break
} else if c == '\\' {
// FIXME 这里没有做防守
i++
fld.Append(kwd[i])
} else {
fld.Append(c)
}
}
continue
}
// 如果是括弧
if z.IsInStrings(qb.BracketBegin, string(c)) {
fld.Append(c)
for i++; i < kszie; i++ {
c = kwd[i]
fld.Append(c)
if z.IsInStrings(qb.BracketEnd, string(c)) {
break
}
}
continue
}
// 如果是分隔符
if z.IsInStrings(qb.SepAnd, string(c)) || z.IsInStrings(qb.SepOr, string(c)) {
cfld := z.Trim(fld.String())
if len(cfld) > 0 {
flds = append(flds, cfld)
seps = append(seps, c)
fld = z.StringBuilder()
}
continue
}
// 没什么特殊情况,那就加入到sb
fld.Append(c)
}
// 加入最后一个条件
lfld := z.Trim(fld.String())
if len(lfld) > 0 {
flds = append(flds, lfld)
}
// 打印一下
if z.IsDebugOn() && len(flds) > 0 {
z.DebugPrintf("kwd : %s\n", kwd)
for _, f := range flds {
z.DebugPrintf("fld : %s\n", f)
}
for _, s := range seps {
z.DebugPrintf("sep : '%s'\n", string(s))
}
}
return isGOr, isGAnd, flds, seps
}
// 读取解析规则, 传入一个实现了io.Reader的对象即可
func (qb *QWBuilder) LoadRules(reader io.Reader) *QWBuilder {
bufreader := bufio.NewReader(reader)
var line string
var lnum int
var err error
var rules []*QWordRule = make([]*QWordRule, 0)
for true {
line, err = bufreader.ReadString('\n')
if err == io.EOF {
err = nil
break
} else if err != nil {
break
}
lnum++
z.DebugPrintf("rule %2d : %s", lnum, line)
// 忽略空行与注释行
line = strings.TrimSpace(line)
if z.IsBlank(line) || strings.HasPrefix(line, "#") {
continue
}
// 解析行信息
if strings.HasPrefix(line, "$") {
qwRule := new(QWordRule)
// 获得key
var fpos int = strings.Index(line, ":")
if fpos < 0 {
err = errors.New(fmt.Sprintf("invalid rule line %d : %s", lnum, line))
break
}
qwRule.Key = strings.TrimSpace(line[1:fpos])
// 获得regex
var expr string
if line[fpos+1] == ':' {
// 简要模式
expr = "^(" + strings.TrimSpace(line[fpos+2:]) + ")(.*)$"
} else {
// 普通模式
expr = strings.TrimSpace(line[fpos+1:])
}
regex, regerr := regexp.Compile(expr)
if regerr != nil {
err = regerr
break
}
qwRule.Regex = regex
// 读取下一行,必须存在哟
line, err = bufreader.ReadString('\n')
if err == io.EOF {
err = errors.New(fmt.Sprintf("rule line(%d) miss next line", lnum))
break
} else if err != nil {
break
}
lnum++
z.DebugPrintf("rule %2d : %s", lnum, line)
line = strings.TrimSpace(line)
spos := strings.Index(line, "=")
if z.IsBlank(line) || !strings.HasPrefix(line, "$") || spos < 0 {
err = errors.New(fmt.Sprintf("invalid rule line %d : %s", lnum, line))
break
}
// 获得seg
qwRule.Seg = z.Trim(line[:spos])
// 获得type
qcType, qcterr := QCType(strings.TrimSpace(line[spos+1:]))
if qcterr != nil {
err = qcterr
break
}
qwRule.Type = qcType
// 加入到rules
rules = append(rules, qwRule)
}
}
// 是否有错误
if err != nil {
panic(err)
}
qb.Rules = rules
return qb
}