ZoneBuilder/Source/Core/IO/UniversalParser.cs
2016-04-07 15:29:47 +02:00

847 lines
24 KiB
C#

#region ================== Copyright (c) 2007 Pascal vd Heiden
/*
* Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
* This program is released under GNU General Public License
*
* This program 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 General Public License for more details.
*
*/
#endregion
#region ================== Namespaces
using System;
using System.IO;
using System.Text;
using System.Globalization;
using System.Collections.Generic;
#endregion
namespace CodeImp.DoomBuilder.IO
{
public sealed class UniversalParser
{
#region ================== Constants
// Path seperator
//public const string DEFAULT_SEPERATOR = ".";
// Allowed characters in a key
private const string KEY_CHARACTERS = "abcdefghijklmnopqrstuvwxyz0123456789_";
// Parse mode constants
private const int PM_NOTHING = 0;
private const int PM_ASSIGNMENT = 1;
private const int PM_NUMBER = 2;
private const int PM_STRING = 3;
private const int PM_KEYWORD = 4;
// Error strings
private const string ERROR_KEYMISSING = "Missing key name in assignment or scope.";
private const string ERROR_KEYCHARACTERS = "Invalid characters in key name.";
//private const string ERROR_ASSIGNINVALID = "Invalid assignment. Missing a previous terminator symbol?";
private const string ERROR_VALUEINVALID = "Invalid value in assignment. Missing a previous terminator symbol?";
private const string ERROR_VALUETOOBIG = "Value too big.";
private const string ERROR_KEYWITHOUTVALUE = "Key has no value assigned.";
private const string ERROR_KEYWORDUNKNOWN = "Unknown keyword in assignment. Missing a previous terminator symbol?";
#endregion
#region ================== Variables
// Error result
private int cpErrorResult;
private string cpErrorDescription = "";
private int cpErrorLine;
// Configuration root
private UniversalCollection root;
private const string newline = "\n";
private StringBuilder key; //mxd
private StringBuilder val; //mxd
private Dictionary<string, UniversalEntry> matches; //mxd
// Settings
private bool strictchecking = true;
#endregion
#region ================== Properties
// Properties
public int ErrorResult { get { return cpErrorResult; } }
public string ErrorDescription { get { return cpErrorDescription; } }
public int ErrorLine { get { return cpErrorLine; } }
public UniversalCollection Root { get { return root; } }
public bool StrictChecking { get { return strictchecking; } set { strictchecking = value; } }
#endregion
#region ================== Constructor / Destructor
// Constructor
public UniversalParser()
{
// Standard new configuration
NewConfiguration();
// We have no destructor
GC.SuppressFinalize(this);
}
// Constructor to load a file immediately
public UniversalParser(string filename)
{
// Load configuration from file
LoadConfiguration(filename);
// We have no destructor
GC.SuppressFinalize(this);
}
#endregion
#region ================== Private Methods
// This returns a string added with escape characters
private static string EscapedString(string str)
{
// Replace the \ with \\ first!
str = str.Replace("\\", "\\\\");
str = str.Replace(newline, "\\n");
str = str.Replace("\r", "\\r");
str = str.Replace("\t", "\\t");
str = str.Replace("\"", "\\\"");
// Return result
return str;
}
// This raises an error
private void RaiseError(int line, string description)
{
// Raise error
cpErrorResult = 1;
cpErrorDescription = description;
cpErrorLine = line + 1; //mxd
}
// This validates a given key and sets
// error properties if key is invalid and errorline > -1
private bool ValidateKey(string key, int errorline)
{
// Check if key is an empty string
if(key.Length == 0)
{
// ERROR: Missing key name in statement
if(errorline > -1) RaiseError(errorline, ERROR_KEYMISSING);
return false;
}
//Only when strict checking
if(strictchecking)
{
// Check if all characters are valid
string keylc = key.ToLowerInvariant(); //mxd. UDMF key names are case-insensitive
foreach(char c in keylc)
{
if(KEY_CHARACTERS.IndexOf(c) == -1)
{
// ERROR: Invalid characters in key name
if(errorline > -1) RaiseError(errorline, ERROR_KEYCHARACTERS);
return false;
}
}
}
// Key is valid
return true;
}
// This parses a structure in the given data starting
// from the given pos and line and updates pos and line.
private UniversalCollection InputStructure(ref string[] data, ref int pos, ref int line, bool topLevel)
{
int pm = PM_NOTHING; // current parse mode
key.Remove(0, key.Length);
val.Remove(0, val.Length);
bool escape = false; // escape sequence?
bool endofstruct = false; // true as soon as this level struct ends
UniversalCollection cs = new UniversalCollection();
// Go through all of the data until
// the end or until the struct closes
// or when an arror occurred
while((cpErrorResult == 0) && (endofstruct == false))
{
// Get current character
if(line == data.Length - 1) break;
if(pos > data[line].Length - 1)
{
pos = 0;
line++;
if(string.IsNullOrEmpty(data[line])) continue; //mxd. Skip empty lines here so correct line number is displayed on errors
}
char c = data[line][pos]; // current data character
// ================ What parse mode are we at?
if(pm == PM_NOTHING)
{
// Now check what character this is
switch(c)
{
case '{': // Begin of new struct
// Validate key
string s = key.ToString().Trim();
if(ValidateKey(s, line))
{
// Next character
pos++;
// Parse this struct and add it
cs.Add(new UniversalEntry(s.ToLowerInvariant(), InputStructure(ref data, ref pos, ref line, false)));
// Check the last character
pos--;
// Reset the key
key.Remove(0, key.Length);
}
// Leave switch
break;
case '}': // End of this struct
// Stop parsing in this struct
endofstruct = true;
// Leave the loop
break;
case '=': // Assignment
// Validate key
if(ValidateKey(key.ToString().Trim(), line))
{
// Now parsing assignment
pm = PM_ASSIGNMENT;
}
// Leave switch
break;
case ';': // Terminator
// Validate key
if(ValidateKey(key.ToString().Trim(), line))
{
// Error: No value
RaiseError(line, ERROR_KEYWITHOUTVALUE);
}
// Leave switch
break;
case '\n': // New line
// Count the line
line++;
pos = -1;
// Add this to the key as a space.
// Spaces are not allowed, but it will be trimmed
// when its the first or last character.
key.Append(" ");
// Leave switch
break;
case '\\': // Possible comment
case '/':
// Check for the line comment //
if(data[line].Substring(pos, 2) == "//")
{
// Skip everything on this line
pos = -1;
// Have next line?
if(line < data.Length - 1) line++;
}
// Check for the block comment /* */
else if(data[line].Substring(pos, 2) == "/*")
{
// Block comment closes on the same line?.. (mxd)
int np = data[line].IndexOf("*/", pos);
if(np > -1)
{
pos = np + 1;
}
else
{
// Find the next closing block comment
line++;
while((np = data[line].IndexOf("*/", 0)) == -1)
{
if(line == data.Length - 1) break;
line++;
}
// Closing block comment found?
if(np > -1)
{
// Skip everything in this block
pos = np + 1;
}
}
}
// Leave switch
break;
default: // Everything else
if(!topLevel && pos == 0)
{
while(matches.ContainsKey(data[line]))
{
cs.Add(matches[data[line]].Key, matches[data[line]].Value);
line++;
pos = -1;
}
}
// Add character to key
if(pos != -1) key.Append(c);
// Leave switch
break;
}
}
// ================ Parsing an assignment
else if(pm == PM_ASSIGNMENT)
{
// Check for string opening
if(c == '\"')
{
// Now parsing string
pm = PM_STRING; //numbers
}
// Check for numeric character numbers
else if(Configuration.NUMBERS2.IndexOf(c) > -1)
{
// Now parsing number
pm = PM_NUMBER;
// Go one byte back, because this
// byte is part of the number!
pos--;
}
// Check for new line
else if(c == '\n')
{
// Count the new line
line++;
}
// Check if assignment ends
else if(c == ';')
{
// End of assignment
pm = PM_NOTHING;
// Remove this if it causes problems
key.Remove(0, key.Length);
val.Remove(0, val.Length);
}
// Otherwise (if not whitespace) it will be a keyword
else if((c != ' ') && (c != '\t'))
{
// Now parsing a keyword
pm = PM_KEYWORD;
// Go one byte back, because this
// byte is part of the keyword!
pos--;
}
}
// ================ Parsing a number
else if(pm == PM_NUMBER)
{
// Check if number ends here
if(c == ';')
{
// Hexadecimal?
string s = val.ToString();
if((s.Length > 2) && s.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
{
// Convert to int
try
{
// Convert to value
int ival = Convert.ToInt32(s.Substring(2).Trim(), 16);
// Add it to struct
UniversalEntry entry = new UniversalEntry(key.ToString().Trim().ToLowerInvariant(), ival);
cs.Add(entry);
if(!matches.ContainsKey(data[line])) matches.Add(data[line], entry);
}
catch(OverflowException)
{
// Too large for Int32, try Int64
try
{
// Convert to value
long lval = Convert.ToInt64(s.Substring(2).Trim(), 16);
// Add it to struct
UniversalEntry entry = new UniversalEntry(key.ToString().Trim().ToLowerInvariant(), lval);
cs.Add(entry);
if(!matches.ContainsKey(data[line])) matches.Add(data[line], entry);
}
catch(OverflowException)
{
// Too large for Int64, return error
RaiseError(line, ERROR_VALUETOOBIG);
}
catch(FormatException)
{
// ERROR: Invalid value in assignment
RaiseError(line, ERROR_VALUEINVALID + "\n\nUnrecognized token: '" + s.Trim() + "'");
}
}
catch(FormatException)
{
// ERROR: Invalid value in assignment
RaiseError(line, ERROR_VALUEINVALID + "\n\nUnrecognized token: '" + s.Trim() + "'");
}
}
// Floating point?
//mxd. Can be in scientific notation (like "1E-06")
else if(s.IndexOf('.') > -1 || s.ToLowerInvariant().Contains("e-"))
{
float fval = 0;
// Convert to float (remove the f first)
try { fval = Convert.ToSingle(s.Trim(), CultureInfo.InvariantCulture); }
catch(FormatException)
{
// ERROR: Invalid value in assignment
RaiseError(line, ERROR_VALUEINVALID + "\n\nUnrecognized token: '" + s.Trim() + "'");
}
// Add it to struct
UniversalEntry entry = new UniversalEntry(key.ToString().Trim().ToLowerInvariant(), fval);
cs.Add(entry);
if(!matches.ContainsKey(data[line])) matches.Add(data[line], entry);
}
else
{
// Convert to int
try
{
// Convert to value
int ival = Convert.ToInt32(s.Trim(), CultureInfo.InvariantCulture);
// Add it to struct
UniversalEntry entry = new UniversalEntry(key.ToString().Trim().ToLowerInvariant(), ival);
cs.Add(entry);
if(!matches.ContainsKey(data[line])) matches.Add(data[line], entry);
}
catch(OverflowException)
{
// Too large for Int32, try Int64
try
{
// Convert to value
long lval = Convert.ToInt64(s.Trim(), CultureInfo.InvariantCulture);
// Add it to struct
UniversalEntry entry = new UniversalEntry(key.ToString().Trim().ToLowerInvariant(), lval);
cs.Add(entry);
if(!matches.ContainsKey(data[line])) matches.Add(data[line], entry);
}
catch(OverflowException)
{
// Too large for Int64, return error
RaiseError(line, ERROR_VALUETOOBIG);
}
catch(FormatException)
{
// ERROR: Invalid value in assignment
RaiseError(line, ERROR_VALUEINVALID + "\n\nUnrecognized token: '" + s.Trim() + "'");
}
}
catch(FormatException)
{
// ERROR: Invalid value in assignment
RaiseError(line, ERROR_VALUEINVALID + "\n\nUnrecognized token: '" + s.Trim() + "'");
}
}
// Reset key and value
key.Remove(0, key.Length);
val.Remove(0, val.Length);
// End of assignment
pm = PM_NOTHING;
}
// Check for new line
else if(c == '\n')
{
// Count the new line
line++;
pos = -1;
}
// Everything else is part of the value
else
{
val.Append(c);
}
}
// ================ Parsing a string
else if(pm == PM_STRING)
{
// Check if in an escape sequence
if(escape)
{
// What character?
switch(c)
{
case '\\': val.Append('\\'); break;
case 'n': val.Append(newline); break;
case '\"': val.Append('\"'); break;
case 'r': val.Append('\r'); break;
case 't': val.Append('\t'); break;
default:
// Is it a number?
if(Configuration.NUMBERS.IndexOf(c) > -1)
{
int vv = 0;
char vc = '0';
// Convert the next 3 characters to a number
string v = data[line].Substring(pos, 3);
try { vv = Convert.ToInt32(v.Trim(), CultureInfo.InvariantCulture); }
catch(FormatException)
{
// ERROR: Invalid value in assignment
RaiseError(line, ERROR_VALUEINVALID + "\n\nUnrecognized token: '" + v.Trim() + "'");
}
// Convert the number to a char
try { vc = Convert.ToChar(vv, CultureInfo.InvariantCulture); }
catch(FormatException)
{
// ERROR: Invalid value in assignment
RaiseError(line, ERROR_VALUEINVALID + "\n\nUnrecognized token: '" + v.Trim() + "'");
}
// Add the char
val.Append(vc);
}
else
{
// Add the character as it is
val.Append(c);
}
// Leave switch
break;
}
// End of escape sequence
escape = false;
}
else
{
// Check for sequence start
if(c == '\\')
{
// Next character is of escape sequence
escape = true;
}
// Check if string ends
else if(c == '\"')
{
// Add string to struct
UniversalEntry entry = new UniversalEntry(key.ToString().Trim().ToLowerInvariant(), val.ToString());
cs.Add(entry);
if(!matches.ContainsKey(data[line])) matches.Add(data[line], entry);
// End of assignment
pm = PM_ASSIGNMENT;
// Reset key and value
key.Remove(0, key.Length);
val.Remove(0, val.Length);
}
// Check for new line
else if(c == '\n')
{
// Count the new line
line++;
pos = -1;
}
// Everything else is just part of string
else
{
// Add to value
val.Append(c);
}
}
}
// ================ Parsing a keyword
else if(pm == PM_KEYWORD)
{
// Check if keyword ends
if(c == ';')
{
// Add to the struct depending on the keyword
switch(val.ToString().Trim().ToLowerInvariant())
{
case "true":
// Add boolean true
UniversalEntry t = new UniversalEntry(key.ToString().Trim().ToLowerInvariant(), true);
cs.Add(t);
if(!matches.ContainsKey(data[line])) matches.Add(data[line], t);
break;
case "false":
// Add boolean false
UniversalEntry f = new UniversalEntry(key.ToString().Trim().ToLowerInvariant(), false);
cs.Add(f);
if(!matches.ContainsKey(data[line])) matches.Add(data[line], f);
break;
default:
// Unknown keyword
RaiseError(line, ERROR_KEYWORDUNKNOWN + "\n\nUnrecognized token: '" + val.ToString().Trim() + "'");
break;
}
// End of assignment
pm = PM_NOTHING;
// Reset key and value
key.Remove(0, key.Length);
val.Remove(0, val.Length);
}
// Check for new line
else if(c == '\n')
{
// Count the new line
line++;
pos = -1;
}
// Everything else is just part of keyword
else
{
// Add to value
val.Append(c);
}
}
// Next character
pos++;
}
// Return the parsed result
return cs;
}
// This will create a data structure from the given object
private string OutputStructure(UniversalCollection cs, int level, string newline, bool whitespace)
{
string leveltabs = "";
string spacing = "";
StringBuilder db = new StringBuilder("");
// Check if this ConfigStruct is not empty
if(cs.Count > 0)
{
// Create whitespace
if(whitespace)
{
for(int i = 0; i < level; i++) leveltabs += "\t";
spacing = " ";
}
// Go for each item
for(int i = 0; i < cs.Count; i++)
{
// Check if the value if of collection type
if(cs[i].Value is UniversalCollection)
{
UniversalCollection c = (UniversalCollection)cs[i].Value;
// Output recursive structure
if(whitespace) { db.Append(leveltabs); db.Append(newline); }
db.Append(leveltabs); db.Append(cs[i].Key);
if(!string.IsNullOrEmpty(c.Comment))
{
if(whitespace) db.Append("\t");
db.Append("// " + c.Comment);
}
db.Append(newline);
db.Append(leveltabs); db.Append("{"); db.Append(newline);
db.Append(OutputStructure(c, level + 1, newline, whitespace));
db.Append(leveltabs); db.Append("}"); db.Append(newline);
//if(whitespace) { db.Append(leveltabs); db.Append(newline); } //mxd. Let's save a few Kbs by using single line breaks...
}
// Check if the value is of boolean type
else if(cs[i].Value is bool)
{
db.Append(leveltabs); db.Append(cs[i].Key); db.Append(spacing); db.Append("="); db.Append(spacing);
db.Append((bool)cs[i].Value ? "true;" : "false;"); db.Append(newline);
}
// Check if value is of float type
else if(cs[i].Value is float)
{
// Output the value as float (3 decimals)
float f = (float)cs[i].Value;
db.Append(leveltabs); db.Append(cs[i].Key); db.Append(spacing); db.Append("=");
db.Append(spacing); db.Append(f.ToString("0.000", CultureInfo.InvariantCulture)); db.Append(";"); db.Append(newline);
}
//mxd. Check if value is of double type
else if(cs[i].Value is double)
{
// Output the value as double (7 decimals)
double d = (double)cs[i].Value;
db.Append(leveltabs); db.Append(cs[i].Key); db.Append(spacing); db.Append("=");
db.Append(spacing); db.Append(d.ToString("0.0000000", CultureInfo.InvariantCulture)); db.Append(";"); db.Append(newline);
}
// Check if value is of other numeric type
else if(cs[i].Value.GetType().IsPrimitive)
{
// Output the value unquoted
db.Append(leveltabs); db.Append(cs[i].Key); db.Append(spacing); db.Append("=");
db.Append(spacing); db.Append(String.Format(CultureInfo.InvariantCulture, "{0}", cs[i].Value)); db.Append(";"); db.Append(newline);
}
else
{
// Output the value with quotes and escape characters
db.Append(leveltabs); db.Append(cs[i].Key); db.Append(spacing); db.Append("=");
db.Append(spacing); db.Append("\""); db.Append(EscapedString(cs[i].Value.ToString())); db.Append("\";"); db.Append(newline);
}
}
}
// Return the structure
return db.ToString();
}
#endregion
#region ================== Public Methods
// This clears the last error
public void ClearError()
{
// Clear error
cpErrorResult = 0;
cpErrorDescription = "";
cpErrorLine = 0;
}
// This creates a new configuration
public void NewConfiguration()
{
// Create new configuration
root = new UniversalCollection();
}
// This will save the current configuration to the specified file
public bool SaveConfiguration(string filename) { return SaveConfiguration(filename, "\r\n", true); }
public bool SaveConfiguration(string filename, string newline) { return SaveConfiguration(filename, newline, true); }
public bool SaveConfiguration(string filename, string newline, bool whitespace)
{
// Kill the file if it exists
if(File.Exists(filename)) File.Delete(filename);
// Open file stream for writing
FileStream fstream = File.OpenWrite(filename);
// Create output structure and write to file
string data = OutputConfiguration(newline, whitespace);
byte[] baData= Encoding.ASCII.GetBytes(data);
fstream.Write(baData, 0, baData.Length);
fstream.Flush();
fstream.Close();
// Return true when done, false when errors occurred
return cpErrorResult == 0;
}
// This will output the current configuration as a string
public string OutputConfiguration() { return OutputConfiguration("\r\n", true); }
public string OutputConfiguration(string newline) { return OutputConfiguration(newline, true); }
public string OutputConfiguration(string newline, bool whitespace)
{
// Simply return the configuration structure as string
return OutputStructure(root, 0, newline, whitespace);
}
// This will load a configuration from file
public bool LoadConfiguration(string filename)
{
// Check if the file is missing
if(!File.Exists(filename))
{
throw(new FileNotFoundException("File not found \"" + filename + "\"", filename));
}
else
{
// Load the file contents
List<string> data = new List<string>(100);
using(FileStream stream = File.OpenRead(filename))
{
StreamReader reader = new StreamReader(stream, Encoding.ASCII);
while(!reader.EndOfStream)
{
string line = reader.ReadLine();
if(string.IsNullOrEmpty(line)) continue;
data.Add(line);
}
}
// Load the configuration from this data
return InputConfiguration(data.ToArray());
}
}
// This will load a configuration from string
public bool InputConfiguration(string[] data)
{
// Clear errors
ClearError();
// Parse the data to the root structure
int pos = 0;
int line = 0; //mxd
matches = new Dictionary<string, UniversalEntry>(StringComparer.Ordinal); //mxd
key = new StringBuilder(16); //mxd
val = new StringBuilder(16); //mxd
root = InputStructure(ref data, ref pos, ref line, true);
// Return true when done, false when errors occurred
return (cpErrorResult == 0);
}
#endregion
}
}