1package com.jme3.util.blockparser;
2
3import java.io.IOException;
4import java.io.InputStream;
5import java.io.InputStreamReader;
6import java.io.Reader;
7import java.util.ArrayList;
8import java.util.List;
9
10public class BlockLanguageParser {
11
12    private Reader reader;
13    private ArrayList<Statement> statementStack = new ArrayList<Statement>();
14    private Statement lastStatement;
15    private int lineNumber = 1;
16
17    private BlockLanguageParser(){
18    }
19
20    private void reset(){
21        statementStack.clear();
22        statementStack.add(new Statement(0, "<root>"));
23        lastStatement = null;
24        lineNumber = 1;
25    }
26
27    private void pushStatement(StringBuilder buffer){
28        String content = buffer.toString().trim();
29        if (content.length() > 0){
30            // push last statement onto the list
31            lastStatement = new Statement(lineNumber, content);
32
33            Statement parent = statementStack.get(statementStack.size()-1);
34            parent.addStatement(lastStatement);
35
36            buffer.setLength(0);
37        }
38    }
39
40    private void load(InputStream in) throws IOException{
41        reset();
42
43        reader = new InputStreamReader(in);
44
45        StringBuilder buffer = new StringBuilder();
46        boolean insideComment = false;
47        char lastChar = '\0';
48
49        while (true){
50            int ci = reader.read();
51            char c = (char) ci;
52            if (c == '\r'){
53                continue;
54            }
55            if (insideComment && c == '\n'){
56                insideComment = false;
57            }else if (c == '/' && lastChar == '/'){
58                buffer.deleteCharAt(buffer.length()-1);
59                insideComment = true;
60                pushStatement(buffer);
61                lastChar = '\0';
62            }else if (!insideComment){
63                if (ci == -1 || c == '{' || c == '}' || c == '\n' || c == ';'){
64                    pushStatement(buffer);
65                    lastChar = '\0';
66                    if (c == '{'){
67                        // push last statement onto the stack
68                        statementStack.add(lastStatement);
69                        continue;
70                    }else if (c == '}'){
71                        // pop statement from stack
72                        statementStack.remove(statementStack.size()-1);
73                        continue;
74                    }else if (c == '\n'){
75                        lineNumber++;
76                    }else if (ci == -1){
77                        break;
78                    }
79                }else{
80                    buffer.append(c);
81                    lastChar = c;
82                }
83            }
84        }
85    }
86
87    public static List<Statement> parse(InputStream in) throws IOException {
88        BlockLanguageParser parser = new BlockLanguageParser();
89        parser.load(in);
90        return parser.statementStack.get(0).getContents();
91    }
92}
93