-
Notifications
You must be signed in to change notification settings - Fork 4
/
Copy pathParser.frame
156 lines (124 loc) · 3.86 KB
/
Parser.frame
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
/*----------------------------------------------------------------------
Compiler Generator Coco/R,
Copyright (c) 1990, 2004 Hanspeter Moessenboeck, University of Linz
extended by M. Loeberbauer & A. Woess, Univ. of Linz
with improvements by Pat Terry, Rhodes University
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
As an exception, it is allowed to write an extension of Coco/R that is
used as a plugin in non-free software.
If not otherwise stated, any source code generated by Coco/R (other than
Coco/R itself) does not fall under the GNU General Public License.
----------------------------------------------------------------------*/
-->begin
using System;
-->namespace
public class Parser {
-->constants
const bool _T = true;
const bool _x = false;
const int minErrDist = 2;
public Scanner scanner;
public Errors errors;
public Token t; // last recognized token
public Token la; // lookahead token
int errDist = minErrDist;
-->declarations
public Parser(Scanner scanner) {
this.scanner = scanner;
errors = new Errors();
}
void SynErr (int n) {
if (errDist >= minErrDist) errors.SynErr(la.line, la.col, n);
errDist = 0;
}
public void SemErr (string msg) {
if (errDist >= minErrDist) errors.SemErr(t.line, t.col, msg);
errDist = 0;
}
void Get () {
for (;;) {
t = la;
la = scanner.Scan();
if (la.kind <= maxT) { ++errDist; break; }
-->pragmas
la = t;
}
}
void Expect (int n) {
if (la.kind==n) Get(); else { SynErr(n); }
}
bool StartOf (int s) {
return set[s, la.kind];
}
void ExpectWeak (int n, int follow) {
if (la.kind == n) Get();
else {
SynErr(n);
while (!StartOf(follow)) Get();
}
}
bool WeakSeparator(int n, int syFol, int repFol) {
int kind = la.kind;
if (kind == n) {Get(); return true;}
else if (StartOf(repFol)) {return false;}
else {
SynErr(n);
while (!(set[syFol, kind] || set[repFol, kind] || set[0, kind])) {
Get();
kind = la.kind;
}
return StartOf(syFol);
}
}
-->productions
public void Parse() {
la = new Token();
la.val = "";
Get();
-->parseRoot
}
static readonly bool[,] set = {
-->initialization
};
} // end Parser
public class Errors {
public int count = 0; // number of errors detected
public System.IO.TextWriter errorStream = Console.Out; // error messages go to this stream
public string errMsgFormat = "-- line {0} col {1}: {2}"; // 0=line, 1=column, 2=text
public virtual void SynErr (int line, int col, int n) {
string s;
switch (n) {
-->errors
default: s = "error " + n; break;
}
errorStream.WriteLine(errMsgFormat, line, col, s);
count++;
}
public virtual void SemErr (int line, int col, string s) {
errorStream.WriteLine(errMsgFormat, line, col, s);
count++;
}
public virtual void SemErr (string s) {
errorStream.WriteLine(s);
count++;
}
public virtual void Warning (int line, int col, string s) {
errorStream.WriteLine(errMsgFormat, line, col, s);
}
public virtual void Warning(string s) {
errorStream.WriteLine(s);
}
} // Errors
public class FatalError: Exception {
public FatalError(string m): base(m) {}
}