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Add exception description on PDT parsing error.

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PopSlime
2023-01-24 23:10:52 +08:00
parent 02794d88b9
commit 2304257201
6 changed files with 68 additions and 28 deletions
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2
Assets/Cryville/Common/Pdt/PdtExpression.cs
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@@ -91,7 +91,7 @@ namespace Cryville.Common.Pdt {
}
}
}
public partial class PdtInterpreter<T> {
public partial class PdtInterpreter {
readonly static Dictionary<char, int> OP_PRIORITY = new Dictionary<char, int> {
{ '@', 7 },
{ '*', 6 }, { '/', 6 }, { '%', 6 },

82
Assets/Cryville/Common/Pdt/PdtInterpreter.cs
View File

@@ -1,6 +1,7 @@
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text.RegularExpressions;
@@ -8,8 +9,7 @@ namespace Cryville.Common.Pdt {
/// <summary>
/// Interpreter for Property Definition Tree (PDT) file format.
/// </summary>
/// <typeparam name="T">The object type represented by the PDT.</typeparam>
public partial class PdtInterpreter<T> {
public partial class PdtInterpreter {
/// <summary>
/// The character category map.
/// </summary>
@@ -44,34 +44,35 @@ namespace Cryville.Common.Pdt {
/// </summary>
/// <param name="src">The source string.</param>
/// <returns>The interpreted object.</returns>
public static T Interpret(string src) {
return Interpret(src, BinderAttribute.CreateBinderOfType(typeof(T)));
public static T Interpret<T>(string src) {
return Interpret<T>(src, BinderAttribute.CreateBinderOfType(typeof(T)));
}
/// <summary>
/// Interprets a source string to an object of type <typeparamref name="T" /> with a binder.
/// Interprets a source string to an object of type <typeparamref name="T"/> with a binder.
/// </summary>
/// <param name="src">The source string.</param>
/// <param name="binder">The binder.</param>
/// <returns>The interpreted object.</returns>
public static T Interpret(string src, Binder binder) {
return new PdtInterpreter<T>(src, binder).Interpret();
public static T Interpret<T>(string src, Binder binder) {
return (T)new PdtInterpreter(src, typeof(T), binder).Interpret();
}
readonly string _src;
public string Source { get; private set; }
readonly Type _type;
readonly Binder _binder;
protected int Position { get; private set; }
public int Position { get; private set; }
#pragma warning disable IDE1006
protected char cc { get { return _src[Position]; } }
protected char cc { get { return Source[Position]; } }
protected int ct { get { return cm[cc]; } }
protected string tokenb(int flag) { // Token Whitelist
int sp = Position;
while ((ct & flag) == 0) Position++;
return _src.Substring(sp, Position - sp);
return Source.Substring(sp, Position - sp);
}
protected string tokenw(int flag) { // Token Whitelist
int sp = Position;
while ((ct & flag) != 0) Position++;
return _src.Substring(sp, Position - sp);
return Source.Substring(sp, Position - sp);
}
protected void ws() {
while ((ct & 0x0001) != 0) Position++;
@@ -97,7 +98,7 @@ namespace Cryville.Common.Pdt {
Position++;
} while (ct != 0x0100);
Position++;
return Regex.Replace(_src.Substring(sp + 1, Position - sp - 2), @"\\(.)", "$1");
return Regex.Replace(Source.Substring(sp + 1, Position - sp - 2), @"\\(.)", "$1");
}
protected PdtExpression GetExp() {
var ins = new LinkedList<PdtInstruction>();
@@ -108,23 +109,30 @@ namespace Cryville.Common.Pdt {
readonly Dictionary<string, PdtExpression> defs = new Dictionary<string, PdtExpression>();
/// <summary>
/// Creates an instance of the <see cref="PdtInterpreter{T}" /> class.
/// Creates an instance of the <see cref="PdtInterpreter" /> class.
/// </summary>
/// <param name="src">The source string.</param>
/// <param name="type">The destination type.</param>
/// <param name="binder">The binder. May be <c>null</c>.</param>
public PdtInterpreter(string src, Binder binder) {
_src = src;
public PdtInterpreter(string src, Type type, Binder binder) {
Source = src;
_type = type;
_binder = binder;
if (_binder == null)
_binder = BinderAttribute.CreateBinderOfType(typeof(T));
_binder = BinderAttribute.CreateBinderOfType(_type);
}
/// <summary>
/// Interprets the source to an object of type <typeparamref name="T" />.
/// Interprets the source to an object.
/// </summary>
/// <returns>The interpreted object.</returns>
public T Interpret() {
InterpretDirectives();
return (T)InterpretObject(typeof(T));
public object Interpret() {
try {
InterpretDirectives();
return InterpretObject(_type);
}
catch (Exception ex) {
throw new PdtParsingException(this, ex);
}
}
void InterpretDirectives() {
bool flag = false;
@@ -229,4 +237,36 @@ namespace Cryville.Common.Pdt {
return tokenb(0x1000).Trim();
}
}
/// <summary>
/// The exception that is thrown when the interpretation of a PDT fails.
/// </summary>
public class PdtParsingException : Exception {
public PdtParsingException(PdtInterpreter interpreter) : this(interpreter, null) { }
public PdtParsingException(PdtInterpreter interpreter, Exception innerException)
: base(GenerateMessage(interpreter, innerException), innerException) { }
static string GenerateMessage(PdtInterpreter interpreter, Exception innerException) {
string src = interpreter.Source;
int pos = interpreter.Position;
if (pos >= src.Length) return "Failed to interpret the PDT: There are some missing or redundant tokens";
int lineStartPos = src.LastIndexOf('\n', pos) + 1;
int previewStartPos = src.LastIndexOf('\n', pos, 64);
if (previewStartPos == -1) {
previewStartPos = pos - 64;
if (previewStartPos < 0) previewStartPos = 0;
}
else previewStartPos++;
int previewEndPos = src.IndexOf('\n', pos, 64);
if (previewEndPos == -1) {
previewEndPos = pos + 64;
if (previewEndPos > src.Length) previewEndPos = src.Length;
}
return string.Format(
"Failed to interpret the PDT at line {0}, position {1}: {2}\n{3}",
src.Take(interpreter.Position).Count(c => c == '\n') + 1,
pos - lineStartPos + 1,
innerException == null ? "Unknown error" : innerException.Message,
src.Substring(previewStartPos, previewEndPos - previewStartPos)
);
}
}
}