diff options
Diffstat (limited to 'sources/ch/epfl')
-rw-r--r-- | sources/ch/epfl/lamp/util/Position.java | 142 | ||||
-rw-r--r-- | sources/ch/epfl/lamp/util/SourceFile.java | 217 |
2 files changed, 359 insertions, 0 deletions
diff --git a/sources/ch/epfl/lamp/util/Position.java b/sources/ch/epfl/lamp/util/Position.java new file mode 100644 index 0000000000..91c9d702a3 --- /dev/null +++ b/sources/ch/epfl/lamp/util/Position.java @@ -0,0 +1,142 @@ +/* ____ ____ ____ ____ ______ *\ +** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala ** +** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL ** +** /_____/\____/\___/\____/____/ ** +\* */ + +// $Id$ + +package ch.epfl.lamp.util; + +public class Position { + + //######################################################################## + // Public Constants + + /** Number of bits used to encode the file */ + public static final int FILE_BITS = 6; + /** Number of bits used to encode the line number */ + public static final int LINE_BITS = 16; + /** Number of bits used to encode the column number */ + public static final int COLUMN_BITS = 32 - LINE_BITS - FILE_BITS; + + /** Mask to decode the file */ + public static final int FILE_MASK = (1 << FILE_BITS) - 1; + /** Mask to decode the line number */ + public static final int LINE_MASK = (1 << LINE_BITS) - 1; + /** Mask to decode the column number */ + public static final int COLUMN_MASK = (1 << COLUMN_BITS) - 1; + + /** The undefined position */ + public static final int NOPOS = 0; + + /** The first position in a source file */ + public static final int FIRSTPOS = encode(null, 1, 1); + + //######################################################################## + // Public Functions + + /** Encodes a position into a single int. */ + public static int encode(SourceFile file, int line, int column) { + int fileId = file == null ? 0 : file.id() & FILE_MASK; + if (fileId < 0 || FILE_MASK < fileId) fileId = 0; + if (line < 0 || LINE_MASK < line) line = 0; + if (column < 0 || COLUMN_MASK < column) column = 0; + return (((fileId << LINE_BITS) | line) << COLUMN_BITS) | column; + } + + /** Returns the file of the encoded position. */ + public static SourceFile file(int position) { + int fileId = (position >> (COLUMN_BITS + LINE_BITS)) & FILE_MASK; + return SourceFile.fromId(fileId); + } + + /** Returns the line number of the encoded position. */ + public static int line(int position) { + return (position >> COLUMN_BITS) & LINE_MASK; + } + + /** Returns the column number of the encoded position. */ + public static int column(int position) { + return position & COLUMN_MASK; + } + + //######################################################################## + // Private Fields + + /** The position's file */ + private final SourceFile file; + + /** The position's line number */ + private final int line; + + /** The position's column number */ + private final int column; + + //######################################################################## + // Public Constructors + + /** Initializes a new instance. */ + public Position(int position) { + this(file(position), line(position), column(position)); + } + + /** Initializes a new instance. */ + public Position(String source) { + this(new SourceFile(source, new byte[0])); + } + + /** Initializes a new instance. */ + public Position(SourceFile file) { + this(file, 0, 0); + } + + /** Initializes a new instance. */ + public Position(SourceFile file, int line, int column) { + this.file = file; + this.line = line; + this.column = column; + } + + //######################################################################## + // Public Methods + + /** Returns an int encoding this position. */ + public int encode() { + return encode(file, line, column); + } + + /** Returns the file of this position. */ + public SourceFile file() { + return file; + } + + /** Returns the line number of this position. */ + public int line() { + return line; + } + + /** Returns the column number of this position. */ + public int column() { + return column; + } + + /** Returns a string representation of this position. */ + public String toString() { + return file.name() + ":" + line + ":" + column; + } + + /** Returns the hash code of this position. */ + public int hashCode() { + return encode(); + } + + /** Returns true iff the given object represents the same position. */ + public boolean equals(Object object) { + if (!(object instanceof Position)) return false; + Position that = (Position)object; + return file == that.file && line == that.line && column == that.column; + } + + //######################################################################## +} 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 @@ -0,0 +1,217 @@ +/* ____ ____ ____ ____ ______ *\ +** / __// __ \/ __// __ \/ ____/ 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; + } + + //######################################################################## +} |