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/* valaccodewriter.vala
*
* Copyright (C) 2006-2007 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
/**
* Represents a writer to write C source files.
*/
public class Vala.CCodeWriter : Object {
/**
* Specifies the file to be written.
*/
public string filename {
get {
return _filename;
}
construct {
_filename = value;
file_exists = FileUtils.test (_filename, FileTest.EXISTS);
if (file_exists) {
temp_filename = "%s.valatmp".printf (_filename);
stream = FileStream.open (temp_filename, "w");
} else {
stream = FileStream.open (_filename, "w");
}
}
}
/**
* Specifies whether to emit line directives.
*/
public bool line_directives { get; set; }
/**
* Specifies whether the output stream is at the beginning of a line.
*/
public bool bol {
get { return _bol; }
}
private string _filename;
private string temp_filename;
private bool file_exists;
private FileStream stream;
private int indent;
/* at begin of line */
private bool _bol = true;
public CCodeWriter (string! _filename) {
filename = _filename;
}
/**
* Closes the file.
*/
public void close () {
stream = null;
if (file_exists) {
var changed = true;
try {
var old_file = new MappedFile (_filename, false);
var new_file = new MappedFile (temp_filename, false);
var len = old_file.get_length ();
if (len == new_file.get_length ()) {
if (Memory.cmp (old_file.get_contents (), new_file.get_contents (), len) == 0) {
changed = false;
}
}
old_file = null;
new_file = null;
} catch (FileError e) {
// assume changed if mmap comparison doesn't work
}
if (changed) {
FileUtils.rename (temp_filename, _filename);
} else {
FileUtils.unlink (temp_filename);
}
}
}
/**
* Writes tabs according to the current indent level.
*/
public void write_indent (CCodeLineDirective line = null) {
if (line_directives && line != null) {
line.write (this);
}
if (!bol) {
stream.putc ('\n');
}
for (int i = 0; i < indent; i++) {
stream.putc ('\t');
}
_bol = false;
}
/**
* Writes the specified string.
*
* @param s a string
*/
public void write_string (string! s) {
stream.printf ("%s", s);
_bol = false;
}
/**
* Writes a newline.
*/
public void write_newline () {
stream.putc ('\n');
_bol = true;
}
/**
* Opens a new block, increasing the indent level.
*/
public void write_begin_block () {
if (!bol) {
stream.putc (' ');
} else {
write_indent ();
}
stream.putc ('{');
write_newline ();
indent++;
}
/**
* Closes the current block, decreasing the indent level.
*/
public void write_end_block () {
assert (indent > 0);
indent--;
write_indent ();
stream.printf ("}");
}
/**
* Writes the specified text as comment.
*
* @param text the comment text
*/
public void write_comment (string! text) {
write_indent ();
stream.printf ("/*");
bool first = true;
/* separate declaration due to missing memory management in foreach statements */
var lines = text.split ("\n");
foreach (string line in lines) {
if (!first) {
write_indent ();
} else {
first = false;
}
stream.printf ("%s", line);
}
stream.printf ("*/");
write_newline ();
}
}
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