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1
12
13 package com.lowagie.text.pdf.codec.postscript;
14
15 import java.lang.*;
16 import java.lang.reflect.*;
17 import java.util.*;
18 import java.awt.*;
19 import java.awt.geom.*;
20 import java.awt.color.*;
21 import java.awt.font.*;
22
23
24 public class PAEngine extends Object {
25
26 static public final int MODE_STACK = 0;
27 static public final int MODE_PROCEDURE = 1;
28 static public final int MODE_ARRAY = 2;
29
30 protected PAContext context;
31 protected int mode;
32 protected Stack procedure;
33 protected int innerProcedures;
34
35 public PAEngine(PAContext context){
36 super();
37 this.context = context;
38 this.mode = PAEngine.MODE_STACK;
39 }
40
41 public void startProcedure() throws PainterException {
42 this.procedure = new Stack();
43 this.mode = PAEngine.MODE_PROCEDURE;
44 this.innerProcedures = 0;
45 }
46
47 public void endProcedure() throws PainterException {
48 this.context.operands.push(new PAToken(this.procedure, PAToken.PROCEDURE));
49 this.mode = PAEngine.MODE_STACK;
50 }
51
52 public void bindProcedure(PAToken patoken){
53 Stack oldStack = (Stack) patoken.value;
54 Stack newStack = new Stack();
55 int i,n;
56 n = oldStack.size();
57 for(i = 0; i < n; i++){
58 Object token = oldStack.elementAt(i);
59 if((token instanceof PAToken) && ((PAToken) token).type == PAToken.IDENTIFIER){
60 Object foundToken = this.context.findIdentifier(((PAToken) token).value);
61 if(foundToken == null){
62 newStack.push(token);
63 } else {
64 newStack.push(foundToken);
65 }
66 } else {
67 newStack.push(token);
68 }
69 }
70 patoken.value = newStack;
71 }
72
73 public void process(Object token) throws PainterException {
74 if(token == null){
75 throw new IllegalStateException("Null token encountered; last unknown identifier was " + this.context.getLastUnknownIdentifier());
76 }
77 if(token instanceof PAToken && ((PAToken) token).type == PAToken.IMMEDIATE){
79 Object foundValue = this.context.findIdentifier(((PAToken) token).value);
80 this.process(foundValue);
81 return;
82 }
83 if(this.mode == MODE_STACK){
84 if(token instanceof PACommand){
85 ((PACommand) token).execute(this.context);
86 } else if(token instanceof PAToken){
87 PAToken patoken = (PAToken) token;
88
89 switch(patoken.type){
90 case PAToken.IDENTIFIER:
91 this.process(this.context.findIdentifier(patoken.value));
92 break;
93 case PAToken.KEY:
94 case PAToken.MARK:
95 case PAToken.START_ARRAY:
96 this.context.operands.push(token);
97 break;
98 case PAToken.PROCEDURE:
99 Enumeration enumx = ((Vector) patoken.value).elements();
100 while(enumx.hasMoreElements()){
101 this.process(enumx.nextElement());
102 }
103 break;
104 case PAToken.START_PROCEDURE:
105 this.startProcedure();
106 break;
107 case PAToken.END_ARRAY:
108 this.context.collectArray();
109 break;
110 default:
111 throw new IllegalStateException("Unknown token encountered" + token);
112 }
113 } else {
114 this.context.operands.push(token);
115 }
116 } else if(this.mode == MODE_PROCEDURE){
117 if(token instanceof PAToken){
118 PAToken patoken = (PAToken) token;
119
120 switch(patoken.type){
121 case PAToken.START_PROCEDURE:
122 this.innerProcedures++;
123 this.procedure.push(token);
124 break;
125 case PAToken.END_PROCEDURE:
126 if(this.innerProcedures > 0){
127 this.innerProcedures--;
128 this.procedure.push(token);
129 } else {
130 this.endProcedure();
131 }
132 break;
133 default:
134 this.procedure.push(token);
135 }
136 } else {
137 this.procedure.push(token);
138 }
139 }
140 }
141
142 }
143
144
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