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14  * Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
15  * Copyright (C) 2002-2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
16  * Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
17  * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
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31 package org.jruby.parser;
32
33 import java.io.Reader JavaDoc;
34 import java.io.StringReader JavaDoc;
35
36 import org.jruby.Ruby;
37 import org.jruby.RubyFile;
38 import org.jruby.ast.Node;
39 import org.jruby.lexer.yacc.LexerSource;
40 import org.jruby.lexer.yacc.SyntaxException;
41 import org.jruby.runtime.DynamicScope;
42 import org.jruby.runtime.ThreadContext;
43 import org.jruby.util.collections.SinglyLinkedList;
44
45 /**
46  * Serves as a simple facade for all the parsing magic.
47  */
48 public class Parser {
49     private final Ruby runtime;
50
51     public Parser(Ruby runtime) {
52         this.runtime = runtime;
53     }
54
55     public Node parse(String JavaDoc file, String JavaDoc content, DynamicScope blockScope) {
56         return parse(file, new StringReader JavaDoc(content), blockScope);
57     }
58
59     public Node parse(String JavaDoc file, Reader JavaDoc content, DynamicScope blockScope) {
60         RubyParserConfiguration configuration = new RubyParserConfiguration();
61         SinglyLinkedList cref = runtime.getObject().getCRef();
62         ThreadContext tc = runtime.getCurrentContext();
63
64         // We only need to pass in current scope if we are evaluating as a block (which
65 // is only done for evals). We need to pass this in so that we can appropriately scope
66 // down to captured scopes when we are parsing.
67 if (blockScope != null) {
68             configuration.parseAsBlock(blockScope);
69         }
70         
71         DefaultRubyParser parser = null;
72         RubyParserResult result = null;
73         try {
74             parser = RubyParserPool.getInstance().borrowParser();
75             parser.setWarnings(runtime.getWarnings());
76             tc.setCRef(cref);
77             LexerSource lexerSource = LexerSource.getSource(file, content);
78             result = parser.parse(configuration, lexerSource);
79             if (result.isEndSeen()) {
80                 org.jruby.runtime.builtin.IRubyObject verbose = runtime.getVerbose();
81                 runtime.setVerbose(runtime.getNil());
82                 runtime.defineGlobalConstant("DATA", new RubyFile(runtime, file, content));
83                 runtime.setVerbose(verbose);
84                 result.setEndSeen(false);
85             }
86         } catch (SyntaxException e) {
87             StringBuffer JavaDoc buffer = new StringBuffer JavaDoc(100);
88             buffer.append(e.getPosition().getFile()).append(':');
89             buffer.append(e.getPosition().getEndLine()).append(": ");
90             buffer.append(e.getMessage());
91             throw runtime.newSyntaxError(buffer.toString());
92         } finally {
93             RubyParserPool.getInstance().returnParser(parser);
94             tc.unsetCRef();
95         }
96         
97         // If variables were added then we may need to grow the dynamic scope to match the static
98 // one.
99 // FIXME: Make this so we only need to check this for blockScope != null. We cannot
100 // currently since we create the DynamicScope for a LocalStaticScope before parse begins.
101 // Refactoring should make this fixable.
102 if (result.getScope() != null) {
103             result.getScope().growIfNeeded();
104         }
105
106         // FIXME: We should move this into ParserSupport.addRootNode since actual parser should do this.
107 result.addAppendBeginAndEndNodes();
108         return result.getAST();
109     }
110 }
111
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