2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
4 \section[PrefixSyn]{``Prefix-form'' syntax}
6 This module contains an algebraic data type into which a prefix form
7 string from the current Haskell parser is converted. Given in an
8 order that follows the \tr{Prefix_Form} document.
11 #include "HsVersions.h"
31 #ifdef REALLY_HASKELL_1_3
32 ord = fromEnum :: Char -> Int
37 type SrcFile = FAST_STRING
44 | RdrAndBindings RdrBinding RdrBinding
46 | RdrTyDecl RdrNameTyDecl
47 | RdrFunctionBinding SrcLine [RdrMatch]
48 | RdrPatternBinding SrcLine [RdrMatch]
49 | RdrClassDecl RdrNameClassDecl
50 | RdrInstDecl RdrNameInstDecl
51 | RdrDefaultDecl RdrNameDefaultDecl
53 -- signatures are mysterious; we can't
54 -- tell if its a Sig or a ClassOpSig,
55 -- so we just save the pieces:
56 | RdrTySig [RdrName] -- vars getting sigs
57 RdrNamePolyType -- the type
60 -- user pragmas come in in a Sig-ish way/form...
61 | RdrSpecValSig [RdrNameSig]
62 | RdrInlineValSig RdrNameSig
63 | RdrDeforestSig RdrNameSig
64 | RdrMagicUnfoldingSig RdrNameSig
65 | RdrSpecInstSig RdrNameSpecInstSig
66 | RdrSpecDataSig RdrNameSpecDataSig
68 type SigConverter = RdrBinding {- a Sig -} -> [RdrNameSig]
82 [(RdrNameHsExpr, RdrNameHsExpr)]
87 Unscramble strings representing oct/dec/hex integer literals:
89 readInteger :: String -> Integer
91 readInteger ('-' : xs) = - (readInteger xs)
92 readInteger ('0' : 'o' : xs) = chk (stoo 0 xs)
93 readInteger ('0' : 'x' : xs) = chk (stox 0 xs)
94 readInteger ['0'] = 0 -- efficiency shortcut?
95 readInteger ['1'] = 1 -- ditto?
96 readInteger xs = chk (stoi 0 xs)
99 chk (i, junk) = panic ("readInteger: junk after reading:"++junk)
101 stoo, stoi, stox :: Integer -> String -> (Integer, String)
103 stoo a (c:cs) | is_oct c = stoo (a*8 + ord_ c - ord_0) cs
106 stoi a (c:cs) | isDigit c = stoi (a*10 + ord_ c - ord_0) cs
109 stox a (c:cs) | isDigit c = stox (a_16_ord_c - ord_0) cs
110 | is_hex c = stox (a_16_ord_c - ord_a + 10) cs
111 | is_Hex c = stox (a_16_ord_c - ord_A + 10) cs
112 where a_16_ord_c = a*16 + ord_ c
115 is_oct c = c >= '0' && c <= '7'
116 is_hex c = c >= 'a' && c <= 'f'
117 is_Hex c = c >= 'A' && c <= 'F'
119 ord_ c = toInteger (ord c)
121 ord_0, ord_a, ord_A :: Integer
122 ord_0 = ord_ '0'; ord_a = ord_ 'a'; ord_A = ord_ 'A'