1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
#
#
# The Nim Compiler
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## Implements the dispatcher for the different parsers.
import
strutils, llstream, ast, astalgo, idents, lexer, options, msgs, parser,
filters, filter_tmpl, renderer, lineinfos, pathutils
type
TFilterKind* = enum
filtNone, filtTemplate, filtReplace, filtStrip
TParserKind* = enum
skinStandard, skinEndX
const
parserNames*: array[TParserKind, string] = ["standard",
"endx"]
filterNames*: array[TFilterKind, string] = ["none", "stdtmpl", "replace",
"strip"]
type
TParsers* = object
skin*: TParserKind
parser*: TParser
template config(p: TParsers): ConfigRef = p.parser.lex.config
proc parseAll*(p: var TParsers): PNode =
case p.skin
of skinStandard:
result = parser.parseAll(p.parser)
of skinEndX:
internalError(p.config, "parser to implement")
proc parseTopLevelStmt*(p: var TParsers): PNode =
case p.skin
of skinStandard:
result = parser.parseTopLevelStmt(p.parser)
of skinEndX:
internalError(p.config, "parser to implement")
proc utf8Bom(s: string): int =
if s.len >= 3 and s[0] == '\xEF' and s[1] == '\xBB' and s[2] == '\xBF':
result = 3
else:
result = 0
proc containsShebang(s: string, i: int): bool =
if i+1 < s.len and s[i] == '#' and s[i+1] == '!':
var j = i + 2
while j < s.len and s[j] in Whitespace: inc(j)
result = s[j] == '/'
proc parsePipe(filename: AbsoluteFile, inputStream: PLLStream; cache: IdentCache;
config: ConfigRef): PNode =
result = newNode(nkEmpty)
var s = llStreamOpen(filename, fmRead)
if s != nil:
var line = newStringOfCap(80)
discard llStreamReadLine(s, line)
var i = utf8Bom(line)
var linenumber = 1
if containsShebang(line, i):
discard llStreamReadLine(s, line)
i = 0
inc linenumber
if i+1 < line.len and line[i] == '#' and line[i+1] == '?':
when defined(nimpretty):
# XXX this is a bit hacky, but oh well...
quit "can't nimpretty a source code filter"
else:
inc(i, 2)
while i < line.len and line[i] in Whitespace: inc(i)
var q: TParser
parser.openParser(q, filename, llStreamOpen(substr(line, i)), cache, config)
result = parser.parseAll(q)
parser.closeParser(q)
llStreamClose(s)
proc getFilter(ident: PIdent): TFilterKind =
for i in low(TFilterKind) .. high(TFilterKind):
if cmpIgnoreStyle(ident.s, filterNames[i]) == 0:
return i
result = filtNone
proc getParser(conf: ConfigRef; n: PNode; ident: PIdent): TParserKind =
for i in low(TParserKind) .. high(TParserKind):
if cmpIgnoreStyle(ident.s, parserNames[i]) == 0:
return i
localError(conf, n.info, "unknown parser: " & ident.s)
proc getCallee(conf: ConfigRef; n: PNode): PIdent =
if n.kind in nkCallKinds and n.sons[0].kind == nkIdent:
result = n.sons[0].ident
elif n.kind == nkIdent:
result = n.ident
else:
localError(conf, n.info, "invalid filter: " & renderTree(n))
proc applyFilter(p: var TParsers, n: PNode, filename: AbsoluteFile,
stdin: PLLStream): PLLStream =
var ident = getCallee(p.config, n)
var f = getFilter(ident)
case f
of filtNone:
p.skin = getParser(p.config, n, ident)
result = stdin
of filtTemplate:
result = filterTmpl(stdin, filename, n, p.config)
of filtStrip:
result = filterStrip(p.config, stdin, filename, n)
of filtReplace:
result = filterReplace(p.config, stdin, filename, n)
if f != filtNone:
assert p.config != nil
if hintCodeBegin in p.config.notes:
rawMessage(p.config, hintCodeBegin, [])
msgWriteln(p.config, result.s)
rawMessage(p.config, hintCodeEnd, [])
proc evalPipe(p: var TParsers, n: PNode, filename: AbsoluteFile,
start: PLLStream): PLLStream =
assert p.config != nil
result = start
if n.kind == nkEmpty: return
if n.kind == nkInfix and n[0].kind == nkIdent and n[0].ident.s == "|":
for i in 1 .. 2:
if n.sons[i].kind == nkInfix:
result = evalPipe(p, n.sons[i], filename, result)
else:
result = applyFilter(p, n.sons[i], filename, result)
elif n.kind == nkStmtList:
result = evalPipe(p, n.sons[0], filename, result)
else:
result = applyFilter(p, n, filename, result)
proc openParsers*(p: var TParsers, fileIdx: FileIndex, inputstream: PLLStream;
cache: IdentCache; config: ConfigRef) =
assert config != nil
var s: PLLStream
p.skin = skinStandard
let filename = toFullPathConsiderDirty(config, fileIdx)
var pipe = parsePipe(filename, inputstream, cache, config)
p.config() = config
if pipe != nil: s = evalPipe(p, pipe, filename, inputstream)
else: s = inputstream
case p.skin
of skinStandard, skinEndX:
parser.openParser(p.parser, fileIdx, s, cache, config)
proc closeParsers*(p: var TParsers) =
parser.closeParser(p.parser)
proc setupParsers*(p: var TParsers; fileIdx: FileIndex; cache: IdentCache;
config: ConfigRef): bool =
var f: File
let filename = toFullPathConsiderDirty(config, fileIdx)
if not open(f, filename.string):
rawMessage(config, errGenerated, "cannot open file: " & filename.string)
return false
openParsers(p, fileIdx, llStreamOpen(f), cache, config)
result = true
proc parseFile*(fileIdx: FileIndex; cache: IdentCache; config: ConfigRef): PNode {.procvar.} =
var p: TParsers
if setupParsers(p, fileIdx, cache, config):
result = parseAll(p)
closeParsers(p)
|