File size: 3,527 Bytes
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* Copyright by the contributors to the Dafny Project
* SPDX-License-Identifier: MIT
*******************************************************************************/
// RUN: %verify "%s"
// RUN: %run --no-verify --unicode-char:false --target:cs "%s" --input "%S/../../src/FileIO/FileIO.cs" -- "%t_cs" "System.ArgumentException:"
// RUN: %run --no-verify --unicode-char:false --target:java "%s" --input "%S/../../src/FileIO/FileIO.java" -- "%t_java" "java.nio.file.FileSystemException:"
// RUN: %run --no-verify --unicode-char:false --target:js "%s" --input "%S/../../src/FileIO/FileIO.js" -- "%t_js" "Error: ENOENT"
//// Check that written files match expectations
// RUN: %diff "%S/data.txt" "%t_cs/output_plain"
// RUN: %diff "%S/data.txt" "%t_cs/foo/bar/output_nested"
// RUN: %diff "%S/data.txt" "%t_cs/foo/output_up"
// RUN: %diff "%S/data.txt" "%t_java/output_plain"
// RUN: %diff "%S/data.txt" "%t_java/foo/bar/output_nested"
// RUN: %diff "%S/data.txt" "%t_java/foo/output_up"
// RUN: %diff "%S/data.txt" "%t_js/output_plain"
// RUN: %diff "%S/data.txt" "%t_js/foo/bar/output_nested"
// RUN: %diff "%S/data.txt" "%t_js/foo/output_up"
include "../../src/dafny/FileIO/FileIO.dfy"
module WriteBytesToFile {
import Dafny.FileIO
method Main(args: seq<string>) {
expect |args| > 0;
expect |args| == 3, "usage: " + args[0] + " OUTPUT_DIR EXPECTED_ERROR_PREFIX";
var outputDir := args[1];
var expectedErrorPrefix := args[2];
// Happy paths: write files to the output dir. (The %diff LIT commands check that we wrote the correct content.)
{
// Ideally we would define `str` as a constant and compute `bytes` automatically.
// To do so, we would need to convert each `char` in `str` to a `bv8` value, by using `as bv8`.
// But that triggers a bug in the Java compiler: <https://github.com/dafny-lang/dafny/issues/2942>.
// So for now we settle for manually writing out the desired `bytes`,
// and statically verifying that these values match the characters of `str`.
ghost var str := "Hello world\nGoodbye\n";
var bytes: seq<bv8> := [
// "Hello world\n"
0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x0a,
// "Goodbye\n"
0x47, 0x6f, 0x6f, 0x64, 0x62, 0x79, 0x65, 0x0a
];
assert forall i | 0 <= i < |bytes| :: bytes[i] as int == str[i] as int;
// Write directly into the output directory
{
var res := FileIO.WriteBytesToFile(outputDir + "/output_plain", bytes);
expect res.Success?, "unexpected failure writing to output_plain: " + res.error;
}
// Ensure that nonexistent parent directories are created as necessary
{
var res := FileIO.WriteBytesToFile(outputDir + "/foo/bar/output_nested", bytes);
expect res.Success?, "unexpected failure writing to output_nested: " + res.error;
}
// Ensure that file paths with .. are handled correctly
{
var res := FileIO.WriteBytesToFile(outputDir + "/foo/bar/../output_up", bytes);
expect res.Success?, "unexpected failure writing to output_up: " + res.error;
}
}
// Failure path: attempting to write to a blank file path should never work.
{
var res := FileIO.WriteBytesToFile("", []);
expect res.Failure?, "unexpected success";
expect expectedErrorPrefix <= res.error, "unexpected error message: " + res.error;
}
}
}
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