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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
//
// ExpressionParserManual.cs
//
// Author:
// Atsushi Enomoto (atsushi@xamarin.com)
//
// Copyright (C) 2013 Xamarin Inc. (http://www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Build.Exceptions;
namespace Microsoft.Build.Internal.Expressions
{
class ExpressionParserManual
{
// FIXME: we are going to not need ExpressionValidationType for this; always LaxString.
public ExpressionParserManual (string source, ExpressionValidationType validationType)
{
if (source == null)
throw new ArgumentNullException ("source");
this.source = source;
validation_type = validationType;
}
string source;
ExpressionValidationType validation_type;
public ExpressionList Parse ()
{
return Parse (0, source.Length);
}
ExpressionList Parse (int start, int end)
{
if (string.IsNullOrWhiteSpace (source))
return new ExpressionList ();
var ret = new ExpressionList ();
while (start < end) {
int bak = start;
ret.Add (ParseSingle (ref start, end));
if (bak == start)
throw new Exception ("Parser failed to progress token position: " + source);
}
return ret;
}
static readonly char [] token_starters = "$@%(),'\"".ToCharArray ();
Expression ParseSingle (ref int start, int end)
{
char token = source [start];
switch (token) {
case '$':
case '@':
case '%':
if (start == end || start + 1 == source.Length || source [start + 1] != '(') {
if (validation_type == ExpressionValidationType.StrictBoolean)
throw new InvalidProjectFileException (string.Format ("missing '(' after '{0}' at {1} in \"{2}\"", source [start], start, source));
else
goto default; // treat as raw literal to the section end
}
start += 2;
int last = FindMatchingCloseParen (start, end);
if (last < 0) {
if (validation_type == ExpressionValidationType.StrictBoolean)
throw new InvalidProjectFileException (string.Format ("expression did not have matching ')' since index {0} in \"{1}\"", start, source));
else {
start -= 2;
goto default; // treat as raw literal to the section end
}
}
Expression ret;
if (token == '$')
ret = EvaluatePropertyExpression (start, last);
else if (token == '%')
ret = EvaluateMetadataExpression (start, last);
else
ret = EvaluateItemExpression (start, last);
start = last + 1;
return ret;
case '\'':
case '"':
var quoteChar = source [start];
start++;
last = FindMatchingCloseQuote (quoteChar, start, end);
if (last < 0) {
if (validation_type == ExpressionValidationType.StrictBoolean)
throw new InvalidProjectFileException (string.Format ("expression did not have matching ')' since index {0} in \"{1}\"", start, source));
else {
start--;
goto default; // treat as raw literal to the section end
}
}
ret = new QuotedExpression () { QuoteChar = quoteChar, Contents = Parse (start, last) };
start = last + 1;
return ret;
// Below (until default) are important only for Condition evaluation
case '(':
if (validation_type == ExpressionValidationType.LaxString)
goto default;
start++;
last = FindMatchingCloseParen (start, end);
if (last < 0) {
if (validation_type == ExpressionValidationType.StrictBoolean)
throw new InvalidProjectFileException (string.Format ("expression did not have matching ')' since index {0} in \"{1}\"", start, source));
else {
start--;
goto default; // treat as raw literal to the section end
}
}
var contents = Parse (start, last).ToArray ();
if (contents.Length > 1)
throw new InvalidProjectFileException (string.Format ("unexpected continuous expression within (){0} in \"{1}\"", contents [1].Column > 0 ? " at " + contents [1].Column : null, source));
return contents.First ();
default:
int idx = source.IndexOfAny (token_starters, start + 1);
string name = idx < 0 ? source.Substring (start, end - start) : source.Substring (start, idx - start);
var val = new NameToken () { Name = name };
ret = new RawStringLiteral () { Value = val };
if (idx >= 0)
start = idx;
else
start = end;
return ret;
}
}
int FindMatchingCloseParen (int start, int end)
{
int n = 0;
for (int i = start; i < end; i++) {
if (source [i] == '(')
n++;
else if (source [i] == ')') {
if (n-- == 0)
return i;
}
}
return -1; // invalid
}
int FindMatchingCloseQuote (char quote, int start, int end)
{
int n = 0;
for (int i = start; i < end; i++) {
if (i < end + 1 && source [i] == '\\' && (source [i + 1] == quote || source [i + 1] == '\\'))
n += 2;
else if (source [i] == quote) {
if (n-- == 0)
return i;
}
}
return -1; // invalid
}
static readonly string spaces = " \t\r\n";
void SkipSpaces (ref int start)
{
while (start < source.Length && spaces.Contains (source [start]))
start++;
}
PropertyAccessExpression EvaluatePropertyExpression (int start, int end)
{
// member access
int dotAt = source.LastIndexOf ('.', end, end - start);
int colonsAt = source.LastIndexOf ("::", end, end - start, StringComparison.Ordinal);
if (dotAt < 0 && colonsAt < 0) {
// property access without member specification
int parenAt = source.IndexOf ('(', start, end - start);
string name = parenAt < 0 ? source.Substring (start, end - start) : source.Substring (start, parenAt - start);
name = name.Trim ();
var access = new PropertyAccess () {
Name = new NameToken () { Name = name },
TargetType = PropertyTargetType.Object
};
if (parenAt > 0) { // method arguments
start = parenAt + 1;
access.Arguments = ParseFunctionArguments (ref start, end);
}
return new PropertyAccessExpression () { Access = access };
}
if (colonsAt < 0 || colonsAt < dotAt) {
// property access with member specification
int mstart = dotAt + 1;
int parenAt = source.IndexOf ('(', mstart, end - mstart);
string name = parenAt < 0 ? source.Substring (mstart, end - mstart) : source.Substring (mstart, parenAt - mstart);
name = name.Trim ();
var access = new PropertyAccess () {
Name = new NameToken () { Name = name },
TargetType = PropertyTargetType.Object,
Target = dotAt < 0 ? null : Parse (start, dotAt).FirstOrDefault ()
};
if (parenAt > 0) { // method arguments
start = parenAt + 1;
access.Arguments = ParseFunctionArguments (ref start, end);
}
return new PropertyAccessExpression () { Access = access };
} else {
// static type access
string type = source.Substring (start, colonsAt - start);
if (type.Length < 2 || type [0] != '[' || type [type.Length - 1] != ']')
throw new InvalidProjectFileException (string.Format ("Static function call misses appropriate type name surrounded by '[' and ']' at {0} in \"{1}\"", start, source));
type = type.Substring (1, type.Length - 2).Trim ();
start = colonsAt + 2;
int parenAt = source.IndexOf ('(', start, end - start);
string member = parenAt < 0 ? source.Substring (start, end - start) : source.Substring (start, parenAt - start);
member = member.Trim ();
if (member.Length == 0)
throw new InvalidProjectFileException ("Static member name is missing");
var access = new PropertyAccess () {
Name = new NameToken () { Name = member },
TargetType = PropertyTargetType.Type,
Target = new StringLiteral () { Value = new NameToken () { Name = type } }
};
if (parenAt > 0) { // method arguments
start = parenAt + 1;
access.Arguments = ParseFunctionArguments (ref start, end);
}
return new PropertyAccessExpression () { Access = access };
}
}
ExpressionList ParseFunctionArguments (ref int start, int end)
{
var args = new ExpressionList ();
do {
SkipSpaces (ref start);
if (start == source.Length)
throw new InvalidProjectFileException ("unterminated function call arguments.");
if (source [start] == ')')
break;
else if (args.Any ()) {
if (source [start] != ',')
throw new InvalidProjectFileException (string.Format ("invalid function call arguments specification. ',' is expected, got '{0}'", source [start]));
start++;
SkipSpaces (ref start);
}
args.Add (ParseSingle (ref start, end));
} while (true);
start++;
return args;
}
ItemAccessExpression EvaluateItemExpression (int start, int end)
{
// using property as context and evaluate
int idx = source.IndexOf ("->", start, StringComparison.Ordinal);
if (idx > 0) {
string name = source.Substring (start, idx - start);
return new ItemAccessExpression () {
Application = new ItemApplication () {
Name = new NameToken () { Name = name },
Expressions = Parse (idx + 2, end)
}
};
} else {
string name = source.Substring (start, end - start);
return new ItemAccessExpression () {
Application = new ItemApplication () { Name = new NameToken () { Name = name } }
};
}
}
MetadataAccessExpression EvaluateMetadataExpression (int start, int end)
{
int idx = source.IndexOf ('.', start, end - start);
string item = idx < 0 ? null : source.Substring (start, idx - start);
string meta = idx < 0 ? source.Substring (start, end - start) : source.Substring (idx + 1, end - idx - 1);
var access = new MetadataAccess () {
ItemType = item == null ? null : new NameToken () { Column = start, Name = item },
Metadata = new NameToken () { Column = idx < 0 ? start : idx + 1, Name = meta }
};
return new MetadataAccessExpression () { Access = access };
}
}
}
|