1 files changed, 217 insertions, 0 deletions
diff --git a/sources/ch/epfl/lamp/util/SourceFile.java b/sources/ch/epfl/lamp/util/SourceFile.java
new file mode 100644
index 0000000000..44dbf82506
--- /dev/null
+++ b/sources/ch/epfl/lamp/util/SourceFile.java
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+/*     ____ ____  ____ ____  ______                                     *\
+**    / __// __ \/ __// __ \/ ____/    SOcos COmpiles Scala             **
+**  __\_ \/ /_/ / /__/ /_/ /\_ \       (c) 2002, LAMP/EPFL              **
+** /_____/\____/\___/\____/____/                                        **
+\*                                                                      */
+
+// $Id$
+
+package ch.epfl.lamp.util;
+
+import java.io.File;
+import java.io.InputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+
+/**
+ * This class represents a single source file.
+ */
+public class SourceFile {
+
+    //########################################################################
+    // Public Constants
+
+    /** Constants used for source parsing */
+    public static final byte LF = 0x0A;
+    public static final byte FF = 0x0C;
+    public static final byte CR = 0x0D;
+    public static final byte SU = 0x1A;
+
+    //########################################################################
+    // Public Functions
+
+    /** Returns the source file with the given id. */
+    public static SourceFile fromId(int id) {
+        if (id <= 0 || files.size() < id) return UNKNOWN;
+        return (SourceFile)files.get(id - 1);
+    }
+
+    /** Releases all source file. */
+    public static void releaseAll() {
+        files.clear();
+    }
+
+    //########################################################################
+    // Private Variables
+
+    /** The unknown source file */
+    private static final SourceFile UNKNOWN = new SourceFile();
+
+    /** The list containing all source files */
+    private static final ArrayList files = new ArrayList();
+
+    //########################################################################
+    // Private Fields
+
+    /** The name of this source file */
+    private final String name;
+
+    /** The content of source this file */
+    private final byte[] bytes;
+
+    /** The id of this source file */
+    private final int id;
+
+    /** The encoding of this source file or null if unspecified */
+    private String encoding;
+
+    /** The position of the last line returned by getLine */
+    private int lineNumber = 0;
+    private int lineStart  = 0;
+    private int lineLength = 0;
+    private int nextIndex  = 0;
+
+    //########################################################################
+    // Private Constructors
+
+    /** Initializes a new instance. */
+    private SourceFile() {
+        this.name = "<<unknown source file>>";
+        this.bytes = normalize(new byte[0]);
+        this.id = 0;
+    }
+
+    //########################################################################
+    // Public Constructors
+
+    /** Initializes a new instance. */
+    public SourceFile(String name) throws IOException {
+        this(new File(name));
+    }
+
+    /** Initializes a new instance. */
+    public SourceFile(File name) throws IOException {
+        this(name.toString(), read(name));
+    }
+
+    /** Initializes a new instance. */
+    public SourceFile(String name, InputStream input) throws IOException {
+        this(name, read(name, input));
+    }
+
+    /** Initializes a new instance. */
+    public SourceFile(String name, byte[] bytes) {
+        this.name = name;
+        this.bytes = normalize(bytes);
+        this.id = files.size() + 1;
+        files.add(this);
+    }
+
+    //########################################################################
+    // Public Methods
+
+    /** Returns the name of this source file. */
+    public String name() {
+        return name;
+    }
+
+    /** Returns the content of this source file. */
+    public byte[] bytes() {
+        return bytes;
+    }
+
+    /** Returns the id of this source file. */
+    public int id() {
+        return id;
+    }
+
+    /** Sets the encoding of the file. */
+    public void setEncoding(String encoding) {
+        this.encoding = encoding;
+    }
+
+    /** Returns the content of the given line. */
+    public String getLine(int line) {
+        int index = lineNumber <= line ? nextIndex : (lineNumber = 0);
+        for (; index < bytes.length && lineNumber < line; lineNumber++) {
+            lineStart = index;
+            for (; index < bytes.length; index++) {
+                if (bytes[index] == CR) break;
+                if (bytes[index] == LF) break;
+                if (bytes[index] == FF) break;
+            }
+            lineLength = index - lineStart;
+            if (index < bytes.length) index++;
+            if (index < bytes.length)
+                if (bytes[index - 1] == CR && bytes[index] == LF) index++;
+        }
+        nextIndex = index;
+        try {
+            return encoding != null ?
+                new String(bytes, lineStart, lineLength, encoding) :
+                new String(bytes, lineStart, lineLength);
+        } catch (UnsupportedEncodingException exception) {
+            throw new Error(exception); // !!! use ApplicationError
+        }
+    }
+
+    /**
+     * Returns an instance of Position representing the given line and
+     * column of this source file.
+     */
+    public Position getPosition(int line, int column) {
+        return new Position(this, line, column);
+    }
+
+    /**
+     * Returns the integer encoding the position of the given line and
+     * column of this source file.
+     */
+    public int getEncodedPosition(int line, int column) {
+        return Position.encode(this, line, column);
+    }
+
+    public String toString() {
+        return name;
+    }
+
+    //########################################################################
+    // Private Methods
+
+    /** Reads the file and returns its content as a byte array. */
+    private static byte[] read(File file) throws IOException {
+        InputStream input = new FileInputStream(file);
+        try {
+            return read(file.toString(), input);
+        } finally {
+            input.close();
+        }
+    }
+
+    /** Reads the InputStream and returns its content as a byte array. */
+    private static byte[] read(String name, InputStream input)
+        throws IOException
+    {
+        try {
+            byte[] bytes = new byte[input.available() + 1];
+            if (input.read(bytes) != bytes.length - 1) throw new IOException();
+            bytes[bytes.length - 1] = SU;
+            return bytes;
+        } catch (IOException exception) {
+            throw new IOException("cannot read '" + name + "'");
+        }
+    }
+
+    /** Ensures that the last byte of the array is SU. */
+    private static byte[] normalize(byte[] input) {
+        if (input.length > 0 && input[input.length - 1] == SU) return input;
+        byte[] bytes = new byte[input.length + 1];
+        System.arraycopy(input, 0, bytes, 0, input.length);
+        bytes[input.length] = SU;
+        return bytes;
+    }
+
+    //########################################################################
+}