/
parser.go
208 lines (184 loc) · 5.56 KB
/
parser.go
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package meta
import (
"github.com/antlr/antlr4/runtime/Go/antlr"
"github.com/gomelon/meta/parser"
"go/token"
"go/types"
"strconv"
"strings"
)
var defaultParser = NewParser(defaultPkgParser)
type Parser struct {
pkgParser *PkgParser
objectToParsedMetaGroups map[types.Object]map[string]Group
}
func NewParser(pkgParser *PkgParser) *Parser {
return &Parser{
pkgParser: pkgParser,
objectToParsedMetaGroups: map[types.Object]map[string]Group{},
}
}
func (p *Parser) FilterByMeta(metaName string, objects []types.Object) []types.Object {
filteredObjects := make([]types.Object, 0, 8)
for _, object := range objects {
if p.HasMeta(metaName, object) {
filteredObjects = append(filteredObjects, object)
}
}
return filteredObjects
}
func (p *Parser) HasMeta(metaName string, object types.Object) bool {
metas := p.ObjectMetaGroups(object, metaName)
return len(metas) > 0
}
func (p *Parser) FilterByMethodHasMeta(metaName string, objects []types.Object) []types.Object {
filteredObjects := make([]types.Object, 0, 8)
for _, object := range objects {
if p.HasMethodHasMeta(metaName, object) {
filteredObjects = append(filteredObjects, object)
}
}
return filteredObjects
}
func (p *Parser) HasMethodHasMeta(metaName string, object types.Object) bool {
methods := p.pkgParser.Methods(object)
for _, method := range methods {
if p.HasMeta(metaName, method) {
return true
}
}
return false
}
func (p *Parser) ObjectMetaGroups(object types.Object, metaNames ...string) (
parsedMetaGroups map[string]Group) {
parsedMetaGroups = map[string]Group{}
for _, metaName := range metaNames {
parsedMetaGroup := p.ObjectMetaGroup(object, metaName)
if len(parsedMetaGroup) == 0 {
continue
}
parsedMetaGroups[metaName] = parsedMetaGroup
}
return
}
func (p *Parser) ObjectMetaGroup(object types.Object, metaName string) (parsedMetaGroup Group) {
metaNameToParsedMetaGroup, ok := p.objectToParsedMetaGroups[object]
if ok {
parsedMetaGroup, ok = metaNameToParsedMetaGroup[metaName]
if ok {
return
}
}
comments := p.pkgParser.Comments(object.Pos())
for _, comment := range comments {
parsedMeta, parsed := parse(metaName, comment)
if !parsed {
continue
}
parsedMetaGroup = append(parsedMetaGroup, parsedMeta)
}
if metaNameToParsedMetaGroup == nil {
metaNameToParsedMetaGroup = map[string]Group{}
p.objectToParsedMetaGroups[object] = metaNameToParsedMetaGroup
}
metaNameToParsedMetaGroup[metaName] = parsedMetaGroup
return
}
func (p *Parser) ObjectMeta(object types.Object, metaName string) (m *Meta) {
group := p.ObjectMetaGroup(object, metaName)
if group != nil && len(group) > 0 {
return group[0]
} else {
return nil
}
}
func (p *Parser) filterComments(pos token.Pos, metaName string) []string {
var filteredComments []string
comments := p.pkgParser.Comments(pos)
for _, comment := range comments {
if strings.HasPrefix(comment, metaName) {
filteredComments = append(filteredComments, comment)
}
}
return filteredComments
}
func parse(qualifyName, comment string) (*Meta, bool) {
comment = strings.TrimSpace(comment)
//第一个字符为+号
if strings.Index(comment, qualifyName) != 1 {
return nil, false
}
is := antlr.NewInputStream(comment)
lexer := parser.NewMetaLexer(is)
stream := antlr.NewCommonTokenStream(lexer, antlr.TokenDefaultChannel)
p := parser.NewMetaParser(stream)
listener := newSpecMetaParserListener(qualifyName)
p.AddParseListener(listener)
p.MetaBody()
parsedMeta := listener.parsedMeta
return parsedMeta, parsedMeta != nil
}
type specMetaParserListener struct {
*parser.BaseMetaParserListener
specQualifyName string
parsedMeta *Meta
currentFieldName string
}
func newSpecMetaParserListener(specQualifyName string) *specMetaParserListener {
return &specMetaParserListener{
BaseMetaParserListener: &parser.BaseMetaParserListener{},
specQualifyName: specQualifyName,
}
}
func (listener *specMetaParserListener) ExitMetaQualifyName(ctx *parser.MetaQualifyNameContext) {
ctxText := ctx.GetText()
if strings.Index(ctxText, "+") != 0 || len(ctxText) <= 1 {
return
}
qualifyName := ctxText[1:]
if listener.specQualifyName != qualifyName {
return
}
listener.parsedMeta = New(qualifyName)
}
func (listener *specMetaParserListener) ExitFieldName(ctx *parser.FieldNameContext) {
if listener.parsedMeta == nil {
return
}
listener.currentFieldName = ctx.GetText()
}
func (listener *specMetaParserListener) ExitFieldNameExpr(ctx *parser.FieldNameExprContext) {
if listener.parsedMeta == nil {
return
}
listener.parsedMeta.properties[listener.currentFieldName] = true
}
func (listener *specMetaParserListener) ExitBoolValue(ctx *parser.BoolValueContext) {
if listener.parsedMeta == nil {
return
}
listener.parsedMeta.properties[listener.currentFieldName] = ctx.GetText() == "true"
}
func (listener *specMetaParserListener) ExitStrValue(ctx *parser.StrValueContext) {
if listener.parsedMeta == nil {
return
}
text := ctx.GetText()
listener.parsedMeta.properties[listener.currentFieldName] = text[1 : len(text)-1]
}
func (listener *specMetaParserListener) ExitFloatValue(ctx *parser.FloatValueContext) {
if listener.parsedMeta == nil {
return
}
text := ctx.GetText()
parseFloat, _ := strconv.ParseFloat(text, 64)
listener.parsedMeta.properties[listener.currentFieldName] = parseFloat
}
func (listener *specMetaParserListener) ExitIntegerValue(ctx *parser.IntegerValueContext) {
if listener.parsedMeta == nil {
return
}
text := ctx.GetText()
parseInt, _ := strconv.ParseInt(text, 10, 64)
listener.parsedMeta.properties[listener.currentFieldName] = parseInt
}