Shulou(Shulou.com)06/03 Report--

This article focuses on "how to write an annotation-based static code enhancer / generator with golang". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor learn how to write an annotation-based static code enhancer / generator in golang.

The main features of SpringSpring: 1. Control inversion (Inversion of Control, IoC) 2. Facing Container 3. Aspect-oriented (AspectOriented Programming, AOP) source gitee address: https://gitee.com/ioly/learning.gooop original text link: https://my.oschina.net/ioly target

Refer to the common notes in spring boot and write "Annotation-based static Code Enhancer / Generator" in golang.

Subgoal (Day 7)

Continue the scan of the hard part:struct/field/method elements today

Common/Tokens.go: lexical parsing support for adding data types

Scanner/IStructScanner.go: interface and implementation of structure Scanner

Common/Tokens.go

Add lexical parsing support for data types:

Parsing basic types / custom types / pointer types / array types / map types respectively

Custom types need to be careful to exclude the 'map'' keyword

Pointers, arrays and map types are all compound types and need to be parsed recursively

Package commonimport ("regexp"strings"sync") type tTokens struct {cache map [string] * regexp.Regexp rwmutex * sync.RWMutex} var Tokens = newTokensLib () func newTokensLib () * tTokens {it: = new (tTokens) it.init () return it} func (me * tTokens) init () {me.cache = make (map [string] * regexp) .Regexp) me.rwmutex = new (sync.RWMutex)} func (me * tTokens) MatchString (s string P string) bool {return strings.HasPrefix (s, p)} func (me * tTokens) MatchRegexp (s string, p string) (bool, string) {me.rwmutex.RLock () r, ok: = me.cache [p] me.rwmutex.RUnlock () if! ok {me.rwmutex.Lock () if r, ok = me.cache [p] ! ok {r, _ = regexp.Compile (p)} me.rwmutex.Unlock ()} if r = = nil {return false, ""} if! r.MatchString (s) {return false, "} return true R.FindString (s)} func (me * tTokens) MatchIdentifier (s string) (bool, string) {return me.MatchRegexp (s, "^ [_ a-zA-Z]\\ w {0pime99}")} func (me * tTokens) MatchSpaces (s string) (bool, string) {return me.MatchRegexp (s, "^\\ s +")} func (me * tTokens) MatchDir (s string) (bool, string) {b, s: = me.MatchRegexp (s) "^ ([a-zA-Z]\:)? ([\ /] [^\] [^\] +) + [\\ /]?") If b {return b, s} b, s = me.MatchRegexp (s, "^\" ([a-zA-Z]\:)? ([\ /] [^ / *? |\\ "\\] +) + [\\]?\\") if b {return b, s} b, s = me.MatchRegexp (s "^'([a-zA-Z]\:)? ([\ /] [^'/: *? |\\"\] +) + [\ /]?'") If b {return b, s} return false, ""} func (me * tTokens) MatchDataType (s string) (bool, string) {if ok,t: = me.MatchBasicType (s); ok {return true, t} if ok,t: = me.MatchCustomType (s) Ok {return true, t} if ok,t: = me.MatchPointerType (s); ok {return true, t} if ok,t: = me.MatchArrayType (s); ok {return true, t} if ok,t: = me.MatchMapType (s) Ok {return true, t} return false, ""} func (me * tTokens) MatchBasicType (s string) (bool, string) {list: = [] string {"int", "string", "bool", "byte", "int32", "int64" "uint32", "uint64", "float32", "float64", "int8", "uint8", "int16", "uint16", "time.Time",} for _ It: = range list {if me.MatchString (s, it) {return true, it}} return false, ""} func (me * tTokens) MatchCustomType (s string) (bool, string) {t: = s b1, S1: = me.MatchRegexp (t `^\ w+\ .`) if b1 {t = t [len (S1):]} b2, S2: = me.MatchRegexp (t, `^\ w+ `) if! b2 {return false, ""} if S2 = = "map" {/ / map is reserved word return false "} return true, S1 + S2} func (me * tTokens) MatchPointerType (s string) (bool, string) {t: = s if t [0]! ='*'{return false,"} t = t [1:] b, s: = me.MatchDataType (t) if! b {return false "} return true," * "+ s} func (me * tTokens) MatchArrayType (s string) (bool, string) {t: = s b1, S1: = me.MatchRegexp (s, `^\ [\ s*\ d *\ s*\]\ s*`) if! b1 {return false,"} t = t [len (S1):] b2 S2: = me.MatchDataType (t) if! b2 {return false, "} return true, S1 + S2} func (me * tTokens) MatchMapType (s string) (bool, string) {t: = s S1: =" map "if! me.MatchString (t, S1) {return false ""} t = t [len (S1):] b2, S2: = me.MatchRegexp (t, `^\ s*\ [\ s* `) if! b2 {return false, ""} t = t [len (S2):] b3jue S3: = me.MatchDataType (t) if! b3 {return false ""} t = t [len (S3):] b4, s4: = me.MatchRegexp (t, `^\ s*\]\ s* `) if! b4 {return false, ""} t = t [len (S4):] b5, S5: = me.MatchDataType (t) if! b5 {return false ""} return true, S1 + S2 + S3 + S4 + S5} scanner/IStructScanner.go

Interface and implementation of structure Scanner

Package scannerimport ("errors"learning/gooop/spring/autogen/common"learning/gooop/spring/autogen/domain"regexp"strings") type IStructScanner interface {ScanStruct (file * domain.CodeFileInfo)} type tStructScanner intfunc (me * tStructScanner) ScanStruct (file * domain.CodeFileInfo) {bInStruct: = false var stru * domain.StructInfo for lineNO Line: = range file.CleanLines {if bInStruct {/ / end? If gStructEndRegexp.MatchString (line) {bInStruct = false me.scanMethod (stru, lineNO + 1) stru = nil continue}} / / start? If gStructStartRegexp.MatchString (line) {bInStruct = true ss: = gStructStartRegexp.FindAllString (line -1) stru: = domain.NewStructInfo () stru.LineNO = lineNO stru.CodeFile = file stru.Name = ss [1] continue} / / in struct block ok,fname Ftype: = me.scanField (line) if ok {stru.AppendField (lineNO, fname, ftype)}} func (me * tStructScanner) scanField (line string) (ok bool, fldName string, fldType string) {if! gFieldStartRegexp.MatchString (line) {return false, "" ""} fldName = strings.TrimSpace (gFieldStartRegexp.FindString (line)) fldType = strings.TrimSpace (line [len (fldName):]) return true, fldName, fldType} func (me * tStructScanner) scanMethod (stru * domain.StructInfo, fromLineNO int) {for iMax. = fromLineNO, len (stru.CodeFile.CleanLines) I

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