ducky/devices

Paddy 2016-01-02 Parent:a700ede02f91

19:51ad0db105c8 Go to Latest

ducky/devices/vendor/code.secondbit.org/pqarrays.hg/parser.go

Update trout to fix routing bug. Update to tip on trout to fix the routing bug that was causing us such issues. See the commit message of trout at 3df515f0cec5 for more details.

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paddy@16 1 package pqarrays
paddy@16 2
paddy@16 3 import (
paddy@16 4 "errors"
paddy@16 5 )
paddy@16 6
paddy@16 7 func parse(l *lexer) ([]*string, error) {
paddy@16 8 var parsed []*string
paddy@16 9 pchan := make(chan *string)
paddy@16 10 errchan := make(chan error)
paddy@16 11 done := make(chan struct{})
paddy@16 12 go runParse(l, pchan, errchan, done)
paddy@16 13 for {
paddy@16 14 select {
paddy@16 15 case err := <-errchan:
paddy@16 16 return parsed, err
paddy@16 17 case item := <-pchan:
paddy@16 18 parsed = append(parsed, item)
paddy@16 19 case <-done:
paddy@16 20 return parsed, nil
paddy@16 21 }
paddy@16 22 }
paddy@16 23 }
paddy@16 24
paddy@16 25 func runParse(l *lexer, parsed chan *string, err chan error, done chan struct{}) {
paddy@16 26 var state parseFunc = parseStart
paddy@16 27 for {
paddy@16 28 var e error
paddy@16 29 state, e = state(l, parsed)
paddy@16 30 if e != nil {
paddy@16 31 err <- e
paddy@16 32 break
paddy@16 33 }
paddy@16 34 if state == nil {
paddy@16 35 break
paddy@16 36 }
paddy@16 37 }
paddy@16 38 close(done)
paddy@16 39 }
paddy@16 40
paddy@16 41 type parseFunc func(*lexer, chan *string) (parseFunc, error)
paddy@16 42
paddy@16 43 func parseEOF(l *lexer, parsed chan *string) (parseFunc, error) {
paddy@16 44 tok := l.nextToken()
paddy@16 45 if tok.typ == tokenWhitespace {
paddy@16 46 tok = l.nextToken()
paddy@16 47 }
paddy@16 48 if tok.typ != tokenEOF {
paddy@16 49 return nil, errors.New("expected EOF, got " + tok.typ.String())
paddy@16 50 }
paddy@16 51 return nil, nil
paddy@16 52 }
paddy@16 53
paddy@16 54 func parseStringOrNull(l *lexer, parsed chan *string) (parseFunc, error) {
paddy@16 55 tok := l.nextToken()
paddy@16 56 if tok.typ == tokenWhitespace {
paddy@16 57 tok = l.nextToken()
paddy@16 58 } else if tok.typ == tokenString {
paddy@16 59 parsed <- &tok.val
paddy@16 60 return parseSeparatorOrDelim, nil
paddy@16 61 } else if tok.typ == tokenNull {
paddy@16 62 parsed <- nil
paddy@16 63 return parseSeparatorOrDelim, nil
paddy@16 64 }
paddy@16 65 return nil, errors.New("expected string, got " + tok.typ.String())
paddy@16 66 }
paddy@16 67
paddy@16 68 func parseSeparatorOrDelim(l *lexer, parsed chan *string) (parseFunc, error) {
paddy@16 69 tok := l.nextToken()
paddy@16 70 if tok.typ == tokenWhitespace {
paddy@16 71 return parseSeparatorOrDelim, nil
paddy@16 72 } else if tok.typ == tokenSeparator {
paddy@16 73 return parseStringOrNull, nil
paddy@16 74 } else if tok.typ == tokenArrayEnd {
paddy@16 75 return parseEOF, nil
paddy@16 76 }
paddy@16 77 return nil, errors.New("expected separator or delim, got " + tok.typ.String())
paddy@16 78 }
paddy@16 79
paddy@16 80 func parseStart(l *lexer, parsed chan *string) (parseFunc, error) {
paddy@16 81 tok := l.nextToken()
paddy@16 82 if tok.typ == tokenWhitespace {
paddy@16 83 return parseStart, nil
paddy@16 84 } else if tok.typ == tokenArrayStart {
paddy@16 85 return parseStringOrNull, nil
paddy@16 86 }
paddy@16 87 return nil, errors.New("expected separator or delim, got " + tok.typ.String())
paddy@16 88 }