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io.n
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io.n
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/*
* Copyright (c) 2003-2008 The University of Wroclaw.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the University may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE UNIVERSITY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using StringTemplate;
using Nemerle;
using Nemerle.Compiler;
using Nemerle.Collections;
using Nemerle.Utility;
using Nemerle.Compiler.Parsetree;
using System;
using System.Diagnostics.Debug;
using System.Reflection;
using System.Text;
using TT = Nemerle.Compiler.Typedtree;
using TExpr = Nemerle.Compiler.Typedtree.TExpr;
using PT = Nemerle.Compiler.Parsetree;
using BF = System.Reflection.BindingFlags;
using SCG = System.Collections.Generic;
namespace Nemerle.IO
{
using Nemerle.IO.Helper;
macro printf (format, params parms : array [expr])
{
PrintfHelper(format, Macros.ImplicitCTX().Env, fun (strFormat) {
def (evals, refs) = make_evaluation_exprs (parse_format (strFormat), parms);
def seq = evals + refs.Map(x => <[ Console.Write ($x) ]>);
<[ { .. $seq } ]>
})
}
macro sprintf (format, params parms : array [expr])
{
when (parms.Length == 0)
Message.Warning ("sprintf with no parameters");
PrintfHelper(format, Macros.ImplicitCTX().Env, fun (strFormat) {
def format = parse_format (strFormat);
def (evals, refs) = make_evaluation_exprs (format, parms);
def exprs = match (refs)
{
| [] => Message.Warning ("empty format"); [<[ "" ]>]
| [expr] =>
if (format.Head.NeedsNullCheck)
evals + [<[ if ($expr == null) string.Empty else $expr.ToString () ]>]
else
evals + [<[ $expr.ToString () ]>]
| _ :: _ => evals + [<[ string.Concat (..$refs) ]>]
}
<[ { ..$exprs } ]>
})
}
/** Writes output to given System.IO.TextWriter */
macro fprintf (writer, format, params parms : array [expr])
{
PrintfHelper(format, Macros.ImplicitCTX().Env, fun (strFormat) {
def (evals, refs) = make_evaluation_exprs (parse_format (strFormat), parms);
def seq = evals + refs.Map(x => <[ writer_v.Write ($x) ]>);
<[
def writer_v = $writer : IO.TextWriter;
{.. $seq }
]>
})
}
macro scanf (format : string, params parms : array [expr])
{
def res = make_scan_expressions (format, parms, <[ stdin ]>);
<[
def stdin = Console.In;
$res
]>
}
macro fscanf (stream, format : string, params parms : array [expr])
{
def res = make_scan_expressions (format, parms, <[ stream_cached ]>);
<[
def stream_cached = $stream;
$res
]>
}
macro sscanf (str, format : string, params parms : array [expr])
{
def res = make_scan_expressions (format, parms, <[ stream_cached ]>);
<[
def stream_cached = IO.StringReader ($str);
$res
]>
}
macro sprint(str)
{
StringTemplate.Helper.SprintImpl(str, true, expr => expr, Macros.ImplicitCTX().Env)
}
// use writer.Write($"...") instade
// macro fprint (writer, str : string)
// {
// <[ $writer.Write(sprint($(str : string))) ]>
// }
/// If string literal is supplied, then prints it to System.Console, replacing all
/// occurences of $id with id.ToString () invocation
/// If any other expression is supplied, it is equivalent to System.Console.Write
macro print (value)
{
match (value)
{
| <[ $(_ : string) ]> => StringTemplate.Helper.SprintImpl(
value, false, expr => <[ Console.Write($expr) ]>, Macros.ImplicitCTX().Env)
| _ => <[ Console.Write ($value) ]>
}
}
// module internal to this assembly used for compile time analysis of string formatters, etc.
internal module Helper
{
public PrintfHelper(format : PExpr, env : GlobalEnv, makeExpr : string -> PExpr) : PExpr
{
match (ConstantFolder.FoldConstants(env, format))
{
| PExpr.Literal(Literal.String(strFormat)) => makeExpr(strFormat)
| _ => Message.Error ("The 'format' parameter mast be string literal.");
PExpr.Error ()
}
}
public variant FormatToken {
| Text { body : string; }
| Number { unsigned : bool; longformat : bool; }
| NumberFloat { longformat : bool; }
| Str
| Chr
| WhiteSpace
public NeedsNullCheck : bool {
get {
match (this) {
| Text | Str => true
| Number | NumberFloat | Chr | WhiteSpace => false
}
}
}
}
/// parse printf-style formatting string
/// http://www.gnu.org/software/libc/manual/html_node/Formatted-Output.html#Formatted%20Output
public parse_format (form : string, scan : bool = false) : list [FormatToken]
{
def buf = StringBuilder ();
mutable result = [];
mutable i = 0;
def n = form.Length;
/*
def parse_percent () : FormatToken {
match (form [i]) {
|
}
}
*/
def append_text ()
{
match (result) {
| FormatToken.Text (t) :: rest =>
result = FormatToken.Text (t + buf.ToString ()) :: rest
| _ =>
result = FormatToken.Text (buf.ToString ()) :: result
}
ignore (buf.Remove (0, buf.Length));
}
while (i < n)
{
match (form[i])
{
| '%' =>
// % occured - first, dump text from buffer
when ( buf.Length > 0 ) append_text ();
mutable longform = false;
def next_char () {
// now analyze next character
++i;
if ( i < n ) {
match (form[i]) {
| 'd' | 'i' => result = FormatToken.Number (false, longform) :: result
| 'u' => result = FormatToken.Number (true, longform) :: result
| 'f' => result = FormatToken.NumberFloat (longform) :: result
| 's' => result = FormatToken.Str () :: result
| 'c' => result = FormatToken.Chr () :: result
| '%' => ignore (buf.Append ('%'))
| 'l' =>
if (longform)
Message.Error ("`l' in printf-format specified twice")
else {
longform = true; next_char ();
}
| _ =>
Message.Error ("Unsupported formatting sequence after % character")
}
}
else
Message.Error ("Unexpected end of format after % character")
}
next_char ();
| c when scan && Char.IsWhiteSpace (c) => result = FormatToken.WhiteSpace () :: result
| c => ignore (buf.Append (c))
}
++i;
}
when (buf.Length > 0) append_text ();
// the result is reversed, but function using it will reverse it again
result
}
public make_evaluation_exprs (toks : list [FormatToken], parms : array [PT.PExpr])
: list [PT.PExpr] * list [PT.PExpr]
{
def make_expressions (toks, i, acc_eval, acc_ref)
{
def continue (x, xs) {
def sym = Macros.NewSymbol ();
make_expressions (xs, i - 1, <[ def $(sym : name) = $x ]> :: acc_eval,
<[ $(sym : name) ]> :: acc_ref)
}
match (toks) {
| [] when i == 0 => (acc_eval, acc_ref)
| FormatToken.Text (t) :: xs =>
make_expressions (xs, i, acc_eval, <[ $(t : string) ]> :: acc_ref)
| _ when i == 0 =>
Message.Error ("not enough arguments for printf macro");
(acc_eval, acc_ref)
| FormatToken.Number (false, false) :: xs => continue (<[ $(parms[i - 1]) : int ]>, xs)
| FormatToken.Number (true, false) :: xs => continue (<[ $(parms[i - 1]) : uint ]>, xs)
| FormatToken.Number (false, true) :: xs => continue (<[ $(parms[i - 1]) : long ]>, xs)
| FormatToken.Number (true, true) :: xs => continue (<[ $(parms[i - 1]) : ulong ]>, xs)
| FormatToken.NumberFloat (false) :: xs =>
continue (<[ Convert.ToString (($(parms[i - 1]) : float),
Globalization.NumberFormatInfo.InvariantInfo) ]>, xs)
| FormatToken.NumberFloat (true) :: xs =>
continue (<[ Convert.ToString (($(parms[i - 1]) : double),
Globalization.NumberFormatInfo.InvariantInfo) ]>, xs)
| FormatToken.Str :: xs => continue (<[ $(parms[i - 1]) : string ]>, xs)
| FormatToken.Chr :: xs => continue (<[ $(parms[i - 1]) : char ]>, xs)
| [] =>
Message.Error ("too many arguments for printf macro");
(acc_eval, acc_ref)
| FormatToken.WhiteSpace :: _ => assert(false)
}
}
make_expressions (toks, parms.Length, [], []);
}
public make_scan_results (format : string, stream : PT.PExpr) : list[PT.PExpr] * PT.PExpr {
def format = parse_format (format).Rev ();
def eat_space = <[ ConsumeWhiteSpace ($stream) ]>;
def (read, res) = format.FoldLeft (([], []), fun (fmt, (acc_read, res)) {
match (fmt : FormatToken) {
| Text (t) =>
(<[ CheckInput ($(t : string), $stream) ]> :: acc_read, res)
| WhiteSpace =>
(eat_space :: acc_read, res)
| Number (usig, lng) =>
def acc_read = acc_read.Rev ();
def conv = match ((usig, lng)) {
| (false, false) => <[ Convert.ToInt32 ]>
| (false, true) => <[ Convert.ToInt64 ]>
| (true, false) => <[ Convert.ToUInt32 ]>
| (true, true) => <[ Convert.ToUInt64 ]>
}
([], <[ { ..$acc_read }; $eat_space; $conv (ReadIntDigits ($stream)) ]> :: res)
| Str =>
def acc_read = acc_read.Rev ();
([], <[
{ ..$acc_read };
$eat_space;
def res = ReadString ($stream);
when (res.Length == 0)
throw Nemerle.IO.InvalidInput ();
res
]> :: res)
| Chr =>
def acc_read = acc_read.Rev ();
([], <[ { ..$acc_read }; Convert.ToChar ($stream.Read ()) ]> :: res)
| NumberFloat =>
Message.FatalError ("scaning floats not supported")
}
});
(res.Rev (), <[ {..$(read.Rev ())} ]>)
}
public make_scan_expressions (format : string, parms : array [PT.PExpr],
stream : PT.PExpr) : PT.PExpr {
def (lst, read) = make_scan_results (format, stream);
def lstLen = lst.Length;
if (parms.Length == 0 && lstLen > 0) { // return tuple of results
def res = Macros.NewSymbol ();
def lst = match (lst) {
| [e] => e
| _ => <[ (..$lst) ]>
}
<[
def $(res : name) = $lst;
$read;
$(res : name);
]>
} else if (parms.Length < lstLen) {
Message.Error ("not enough arguments for scanf-style macro");
<[ () ]>
} else if (parms.Length > lstLen) {
Message.Error ("too many arguments for scanf macro");
<[ () ]>
} else {
def (lst, _) = lst.FoldLeft (([], 0), fun (e, (acc, i)) {
(<[ $(parms[i]) = $e ]> :: acc, i + 1)
});
def lst = lst.Rev ();
<[ { ..$lst }; $read ]>
}
}
}
}