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1 package ppg;
2
3 import java.io.*;
4 import ppg.cmds.*;
5 import ppg.lex.*;
6 import ppg.parse.*;
7 import ppg.spec.*;
8 import ppg.util.*;
9
10 public class PPG
11 {
12 public static final String  HEADER = "ppg: ";
13 public static final String DEBUG_HEADER = "ppg [debug]: ";
14 public static boolean debug = false;
15 public static String SYMBOL_CLASS_NAME = "sym";
16 public static String OUTPUT_FILE = null;
17
18 public static void DEBUG (String s)
19 {
20 if (debug)
21 System.out.println (DEBUG_HEADER + s);
22 }
23
24 public static void main (String args[])
25 {
26 FileInputStream fileInput;
27 String filename = null;
28
29 try
30 {
31 for (int i = 0; i < args.length; i++)
32 {
33 if (args[i].charAt (0) == '-')
35 {
36 if (args[i].equals ("-symbols"))
37 {
38 if (args.length > i)
39 SYMBOL_CLASS_NAME = args[++i];
40 else
41 throw new
42 Exception
43 ("No filename specified after -symbols");
44 }
45 else if (args[i].equals ("-o"))
46 {
47 if (args.length > i)
48 OUTPUT_FILE = args[++i];
49 else
50 throw new
51 Exception
52 ("No filename specified after -o");
53 }
54 else throw new Exception ("Invalid switch: " +
56 args[i]);
57 }
58 else
59 {
60 if (filename == null)
63 filename = args[i];
64 else
65 throw new
66 Exception
67 ("Error: multiple source files specified.");
68 }
69 }
70 }
71 catch (Exception e)
72 {
73 System.err.println (HEADER + e.getMessage ());
74 usage ();
75 }
76
77
78 if (filename == null)
79 {
80 System.err.println ("Error: no filename specified.");
81 usage ();
82 }
83
84 try
85 {
86 fileInput = new FileInputStream (filename);
87 }
88 catch (FileNotFoundException e)
89 {
90 System.out.println ("Error: " + filename + " is not found.");
91 return;
92 }
93 catch (ArrayIndexOutOfBoundsException e)
94 {
95 System.out.println (HEADER + "Error: No file name given.");
96 return;
97 }
98
99 Lexer lex = new Lexer (fileInput, filename);
100
101 Parser parser = new Parser (filename, lex);
102 try
103 {
104 parser.parse ();
105 }
106 catch (Exception e)
107 {
108 System.out.println (HEADER + "Exception: " + e.getMessage ());
109 return;
110 }
111 Spec spec = (Spec) parser.getProgramNode ();
112
113 File file = new File(filename);
114 String parent = file.getParent ();
115 spec.parseChain (parent == null ? "" : parent);
116
117 PrintStream out = System.out;
118
119
120
124 try
125 {
126 if (OUTPUT_FILE != null) {
127 out = new PrintStream(new FileOutputStream(OUTPUT_FILE));
128 }
129
130 CUPSpec combined = spec.coalesce ();
131 CodeWriter cw = new CodeWriter (out, 72);
132 combined.unparse (cw);
133 cw.flush ();
134 }
135 catch (PPGError e)
136 {
137 System.out.println (e.getMessage ());
138 System.exit (1);
139 }
140 catch (IOException e)
141 {
142 System.out.println (HEADER + "exception: " + e.getMessage ());
143 System.exit (1);
144 }
145 }
146
147
148 public static void usage ()
149 {
150 System.err.
151 println ("Usage: ppg [-symbols ConstClass] <input file>\nwhere:\n" +
152 "\t-c <Class>\tclass prepended to token names to pass to <func>\n"
153 + "\t<input>\ta PPG or CUP source file\n");
154 System.exit (1);
155 }
156 }
157 |
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