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31
32
33--% Functions to handle specific errors (mostly syntax)
34
35)package "BOOT"
36
37syGeneralErrorHere() ==
38   sySpecificErrorHere('S2CY0002, [])
39
40sySpecificErrorHere(key, args) ==
41   sySpecificErrorAtToken($stok, key, args)
42
43sySpecificErrorAtToken(tok, key, args) ==
44   pos := tokPosn tok
45   ncSoftError(pos, key, args)
46
47syIgnoredFromTo(pos1, pos2) ==
48  if pfGlobalLinePosn pos1 = pfGlobalLinePosn pos2 then
49      ncSoftError(FromTo(pos1,pos2), 'S2CY0005, [])
50  else
51      ncSoftError(From pos1, 'S2CY0003, [])
52      ncSoftError(To   pos2, 'S2CY0004, [])
53
54npMissingMate(close,open)==
55   ncSoftError(tokPosn open, 'S2CY0008, [])
56   npMissing close
57
58npMissing s==
59   ncSoftError(tokPosn $stok,'S2CY0007, [PNAME s])
60   THROW("TRAPPOINT","TRAPPED")
61
62npCompMissing s == npEqKey s or npMissing s
63
64pfSourceStok x==
65       if pfLeaf? x
66       then x
67       else if null pfParts x
68            then 'NoToken
69            else pfSourceStok pfFirst x
70
71npTrapForm(x)==
72   a:=pfSourceStok x
73   EQ(a,'NoToken)=>
74         syGeneralErrorHere()
75         THROW("TRAPPOINT","TRAPPED")
76   ncSoftError(tokPosn a, 'S2CY0002, [])
77   THROW("TRAPPOINT","TRAPPED")
78
79npTrap()==
80   ncSoftError(tokPosn $stok,'S2CY0002,[])
81   THROW("TRAPPOINT","TRAPPED")
82
83npRecoverTrap()==
84  npFirstTok()
85  pos1 := tokPosn $stok
86  npMoveTo 0
87  pos2 := tokPosn $stok
88  syIgnoredFromTo(pos1, pos2)
89  npPush [pfWrong(pfDocument ['"pile syntax error"],pfListOf [])]
90
91
92npListAndRecover(f)==
93   a:=$stack
94   b:=nil
95   $stack:=nil
96   done:=false
97   c:=$inputStream
98   while not done repeat
99     found:=CATCH("TRAPPOINT",APPLY(f,nil))
100     if found="TRAPPED"
101     then
102        $inputStream:=c
103        npRecoverTrap()
104     else if not found
105          then
106            $inputStream:=c
107            syGeneralErrorHere()
108            npRecoverTrap()
109     if npEqKey "BACKSET"
110     then
111        c:=$inputStream
112     else if npEqPeek "BACKTAB"
113          then
114             done:=true
115          else
116            $inputStream:=c
117            syGeneralErrorHere()
118            npRecoverTrap()
119            if npEqPeek "BACKTAB"
120            then done:=true
121            else
122                npNext()
123                c:=$inputStream
124     b:=cons(npPop1(),b)
125   $stack:=a
126   npPush NREVERSE b
127
128npMoveTo n==
129      if null $inputStream
130      then true
131      else
132           if npEqPeek "BACKTAB"
133           then if n=0
134                then true
135                else (npNext();npMoveTo(n-1))
136           else if npEqPeek "BACKSET"
137                then if n=0
138                     then true
139                     else (npNext();npMoveTo n)
140                 else if npEqKey "SETTAB"
141                      then npMoveTo(n+1)
142                      else (npNext();npMoveTo n)
143