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querycolumn.go
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querycolumn.go
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package main
import (
"html/template"
"strings"
)
// QueryColumnGen QueryColumnGen
func QueryColumnGen(request QueryGenRequest) *QueryGenResponse {
args := request.args
line := request.pkg.FileSet().Position(request.expr.Pos()).String()
//解析第二个参数
secondArgValue := getContantStringValue(line, args[1].Value)
column := strings.Trim(secondArgValue, " ")
//解析第一个参数
firstArgSlice := getSliceType(line, args[0].Type)
firstArgElem := firstArgSlice.Elem()
columnArgExtract, columnArgType := getExtendFieldType(line, firstArgElem, column)
//生成函数
signature := getFunctionSignature(line, args, []bool{false, true})
if hasQueryColumnGenerate[signature] == true {
return nil
}
hasQueryColumnGenerate[signature] = true
importPackage := map[string]bool{}
setImportPackage(line, firstArgElem, importPackage)
setImportPackage(line, columnArgType, importPackage)
argumentDefine := getFunctionArgumentCode(line, args, []bool{false, true})
funcBody := excuteTemplate(queryColumnFuncTmpl, map[string]string{
"signature": signature,
"firstArgElemType": getTypeDeclareCode(line, firstArgElem),
"firstArgElemColumnType": getTypeDeclareCode(line, columnArgType),
"firstArgElemColumnExtract": columnArgExtract,
})
initBody := excuteTemplate(queryColumnInitTmpl, map[string]string{
"signature": signature,
"argumentDefine": argumentDefine,
})
return &QueryGenResponse{
importPackage: importPackage,
funcName: columnFuncPrefix + signature,
funcBody: funcBody,
initBody: initBody,
}
}
const (
columnFuncPrefix = "queryColumnV"
)
var (
queryColumnFuncTmpl *template.Template
queryColumnInitTmpl *template.Template
hasQueryColumnGenerate map[string]bool
)
func init() {
var err error
queryColumnFuncTmpl, err = template.New("name").Parse(`
func ` + columnFuncPrefix + `{{ .signature }}(data interface{},column string)interface{}{
dataIn := data.([]{{ .firstArgElemType }})
result := make([]{{ .firstArgElemColumnType }},len(dataIn),len(dataIn))
for i,single := range dataIn{
result[i] = single{{ .firstArgElemColumnExtract }}
}
return result
}
`)
if err != nil {
panic(err)
}
queryColumnInitTmpl, err = template.New("name").Parse(`
query.ColumnMacroRegister({{.argumentDefine}},` + columnFuncPrefix + `{{.signature}})
`)
if err != nil {
panic(err)
}
registerQueryGen("github.com/fishedee/tools/query.Column", QueryColumnGen)
hasQueryColumnGenerate = map[string]bool{}
}