blob: f6e1208514e0fea1597883f7be31ce8fafe70f22 (
plain)
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
|
package com.jantuomi.interpreter.main.core.parser;
import com.jantuomi.interpreter.main.core.parser.ast.ASTNode;
import com.jantuomi.interpreter.main.core.tokenizer.token.ArgumentInfo;
import com.jantuomi.interpreter.main.core.tokenizer.token.Token;
import com.jantuomi.interpreter.main.exception.ExceptionManager;
import com.jantuomi.interpreter.main.exception.InterpreterException;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
/**
* Created by jan on 11.6.2016.
*/
public class Parser {
private static final Parser instance = new Parser();
private List<Token> tokens;
private List<ASTNode> statementSequence;
public static Parser getInstance() {
return instance;
}
private Parser() {
}
private Stack<Token> stack;
public List<Token> parse(List<Token> tokens) throws InterpreterException {
this.tokens = tokens;
this.stack = new Stack<>();
List<Token> args;
List<Token> output = new ArrayList<>();
for (Token t : tokens) {
if (t.getTokenType() == Token.Type.NewlineToken) {
// if (stack.size() > 0) {
// output.add(stack.pop());
// }
continue;
}
args = new ArrayList<>();
ArgumentInfo argumentInfo = t.getArgumentInfo();
/*
This branch is executed if the token has a variable list of arguments
*/
if (argumentInfo.getVarargs()) {
while (true) {
if (stack.size() > 0) {
Token arg = stack.pop();
if (arg.getTokenType() != argumentInfo.getTerminator()) {
args.add(arg);
}
else {
args.add(arg);
break;
}
}
}
}
/*
If the token has an optional argument type (it is only an argument if
it is of certain type)
*/
else if (argumentInfo.getOptionalArgument() != null) {
if (stack.size() > 0 && stack.peek().getTokenType() == argumentInfo.getOptionalArgument()) {
args.add(stack.pop());
}
}
/* Normal cases with a fixed list of arguments */
else {
for (int i = 0; i < argumentInfo.getCount(); i++) {
if (stack.size() > 0) {
args.add(stack.pop());
} else {
ExceptionManager.raise(InterpreterException.ExceptionType.ArgumentError, t.getLine(),
t.toString(), Integer.toString(argumentInfo.getCount()));
return null;
}
}
}
Token result = t.setArguments(args);
stack.push(result);
}
while (stack.size() > 0) {
output.add(stack.pop());
}
return output;
}
public void printTree(Token e) {
System.out.println("### Token Tree begin ###");
e.print(0);
System.out.println("### Token Tree end ###");
}
public void printAllTrees(List<Token> trees) {
for (Token tree : trees) {
printTree(tree);
}
}
}
|
