Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Globalization / HebrewNumber.cs / 1305376 / HebrewNumber.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System.Globalization {
using System;
using System.Text;
using System.Diagnostics.Contracts;
////////////////////////////////////////////////////////////////////////////
//
// Used in HebrewNumber.ParseByChar to maintain the context information (
// the state in the state machine and current Hebrew number values, etc.)
// when parsing Hebrew number character by character.
//
////////////////////////////////////////////////////////////////////////////
internal struct HebrewNumberParsingContext {
// The current state of the state machine for parsing Hebrew numbers.
internal HebrewNumber.HS state;
// The current value of the Hebrew number.
// The final value is determined when state is FoundEndOfHebrewNumber.
internal int result;
public HebrewNumberParsingContext(int result) {
// Set the start state of the state machine for parsing Hebrew numbers.
state = HebrewNumber.HS.Start;
this.result = result;
}
}
////////////////////////////////////////////////////////////////////////////
//
// Please see ParseByChar() for comments about different states defined here.
//
////////////////////////////////////////////////////////////////////////////
internal enum HebrewNumberParsingState {
InvalidHebrewNumber,
NotHebrewDigit,
FoundEndOfHebrewNumber,
ContinueParsing,
}
////////////////////////////////////////////////////////////////////////////
//
// class HebrewNumber
//
// Provides static methods for formatting integer values into
// Hebrew text and parsing Hebrew number text.
//
// Limitations:
// Parse can only handles value 1 ~ 999.
// ToString() can only handles 1 ~ 999. If value is greater than 5000,
// 5000 will be subtracted from the value.
//
////////////////////////////////////////////////////////////////////////////
internal class HebrewNumber {
// This class contains only static methods. Add a private ctor so that
// compiler won't generate a default one for us.
private HebrewNumber() {
}
////////////////////////////////////////////////////////////////////////////
//
// ToString
//
// Converts the given number to Hebrew letters according to the numeric
// value of each Hebrew letter. Basically, this converts the lunar year
// and the lunar month to letters.
//
// The character of a year is described by three letters of the Hebrew
// alphabet, the first and third giving, respectively, the days of the
// weeks on which the New Year occurs and Passover begins, while the
// second is the initial of the Hebrew word for defective, normal, or
// complete.
//
// Defective Year : Both Heshvan and Kislev are defective (353 or 383 days)
// Normal Year : Heshvan is defective, Kislev is full (354 or 384 days)
// Complete Year : Both Heshvan and Kislev are full (355 or 385 days)
//
////////////////////////////////////////////////////////////////////////////
internal static String ToString(int Number) {
char cTens = '\x0';
char cUnits; // tens and units chars
int Hundreds, Tens; // hundreds and tens values
StringBuilder szHebrew = new StringBuilder();
//
// Adjust the number if greater than 5000.
//
if (Number > 5000) {
Number -= 5000;
}
Contract.Assert(Number > 0 && Number <= 999, "Number is out of range.");;
//
// Get the Hundreds.
//
Hundreds = Number / 100;
if (Hundreds > 0) {
Number -= Hundreds * 100;
// \x05e7 = 100
// \x05e8 = 200
// \x05e9 = 300
// \x05ea = 400
// If the number is greater than 400, use the multiples of 400.
for (int i = 0; i < (Hundreds / 4) ; i++) {
szHebrew.Append('\x05ea');
}
int remains = Hundreds % 4;
if (remains > 0) {
szHebrew.Append((char)((int)'\x05e6' + remains));
}
}
//
// Get the Tens.
//
Tens = Number / 10;
Number %= 10;
switch (Tens) {
case ( 0 ) :
cTens = '\x0';
break;
case ( 1 ) :
cTens = '\x05d9'; // Hebrew Letter Yod
break;
case ( 2 ) :
cTens = '\x05db'; // Hebrew Letter Kaf
break;
case ( 3 ) :
cTens = '\x05dc'; // Hebrew Letter ----d
break;
case ( 4 ) :
cTens = '\x05de'; // Hebrew Letter Mem
break;
case ( 5 ) :
cTens = '\x05e0'; // Hebrew Letter Nun
break;
case ( 6 ) :
cTens = '\x05e1'; // Hebrew Letter Samekh
break;
case ( 7 ) :
cTens = '\x05e2'; // Hebrew Letter Ayin
break;
case ( 8 ) :
cTens = '\x05e4'; // Hebrew Letter Pe
break;
case ( 9 ) :
cTens = '\x05e6'; // Hebrew Letter Tsadi
break;
}
//
// Get the Units.
//
cUnits = (char)(Number > 0 ? ((int)'\x05d0' + Number - 1) : 0);
if ((cUnits == '\x05d4') && // Hebrew Letter He (5)
(cTens == '\x05d9')) { // Hebrew Letter Yod (10)
cUnits = '\x05d5'; // Hebrew Letter Vav (6)
cTens = '\x05d8'; // Hebrew Letter Tet (9)
}
if ((cUnits == '\x05d5') && // Hebrew Letter Vav (6)
(cTens == '\x05d9')) { // Hebrew Letter Yod (10)
cUnits = '\x05d6'; // Hebrew Letter Zayin (7)
cTens = '\x05d8'; // Hebrew Letter Tet (9)
}
//
// Copy the appropriate info to the given buffer.
//
if (cTens != '\x0') {
szHebrew.Append(cTens);
}
if (cUnits != '\x0') {
szHebrew.Append(cUnits);
}
if (szHebrew.Length > 1) {
szHebrew.Insert(szHebrew.Length - 1, '"');
} else {
szHebrew.Append('\'');
}
//
// Return success.
//
return (szHebrew.ToString());
}
////////////////////////////////////////////////////////////////////////////
//
// Token used to tokenize a Hebrew word into tokens so that we can use in the
// state machine.
//
////////////////////////////////////////////////////////////////////////////
enum HebrewToken {
Invalid = -1,
Digit400 = 0,
Digit200_300 = 1,
Digit100 = 2,
Digit10 = 3, // 10 ~ 90
Digit1 = 4, // 1, 2, 3, 4, 5, 8,
Digit6_7 = 5,
Digit7 = 6,
Digit9 = 7,
SingleQuote = 8,
DoubleQuote = 9,
};
////////////////////////////////////////////////////////////////////////////
//
// This class is used to map a token into its Hebrew digit value.
//
////////////////////////////////////////////////////////////////////////////
class HebrewValue {
internal HebrewToken token;
internal int value;
internal HebrewValue(HebrewToken token, int value) {
this.token = token;
this.value = value;
}
}
//
// Map a Hebrew character from U+05D0 ~ U+05EA to its digit value.
// The value is -1 if the Hebrew character does not have a associated value.
//
static HebrewValue[] HebrewValues = {
new HebrewValue(HebrewToken.Digit1, 1) , // '\x05d0
new HebrewValue(HebrewToken.Digit1, 2) , // '\x05d1
new HebrewValue(HebrewToken.Digit1, 3) , // '\x05d2
new HebrewValue(HebrewToken.Digit1, 4) , // '\x05d3
new HebrewValue(HebrewToken.Digit1, 5) , // '\x05d4
new HebrewValue(HebrewToken.Digit6_7,6) , // '\x05d5
new HebrewValue(HebrewToken.Digit6_7,7) , // '\x05d6
new HebrewValue(HebrewToken.Digit1, 8) , // '\x05d7
new HebrewValue(HebrewToken.Digit9, 9) , // '\x05d8
new HebrewValue(HebrewToken.Digit10, 10) , // '\x05d9; // Hebrew Letter Yod
new HebrewValue(HebrewToken.Invalid, -1) , // '\x05da;
new HebrewValue(HebrewToken.Digit10, 20) , // '\x05db; // Hebrew Letter Kaf
new HebrewValue(HebrewToken.Digit10, 30) , // '\x05dc; // Hebrew Letter ----d
new HebrewValue(HebrewToken.Invalid, -1) , // '\x05dd;
new HebrewValue(HebrewToken.Digit10, 40) , // '\x05de; // Hebrew Letter Mem
new HebrewValue(HebrewToken.Invalid, -1) , // '\x05df;
new HebrewValue(HebrewToken.Digit10, 50) , // '\x05e0; // Hebrew Letter Nun
new HebrewValue(HebrewToken.Digit10, 60) , // '\x05e1; // Hebrew Letter Samekh
new HebrewValue(HebrewToken.Digit10, 70) , // '\x05e2; // Hebrew Letter Ayin
new HebrewValue(HebrewToken.Invalid, -1) , // '\x05e3;
new HebrewValue(HebrewToken.Digit10, 80) , // '\x05e4; // Hebrew Letter Pe
new HebrewValue(HebrewToken.Invalid, -1) , // '\x05e5;
new HebrewValue(HebrewToken.Digit10, 90) , // '\x05e6; // Hebrew Letter Tsadi
new HebrewValue(HebrewToken.Digit100, 100) , // '\x05e7;
new HebrewValue(HebrewToken.Digit200_300, 200) , // '\x05e8;
new HebrewValue(HebrewToken.Digit200_300, 300) , // '\x05e9;
new HebrewValue(HebrewToken.Digit400, 400) , // '\x05ea;
};
const int minHebrewNumberCh = 0x05d0;
static char maxHebrewNumberCh = (char)(minHebrewNumberCh + HebrewValues.Length - 1);
////////////////////////////////////////////////////////////////////////////
//
// Hebrew number parsing State
// The current state and the next token will lead to the next state in the state machine.
// DQ = Double Quote
//
////////////////////////////////////////////////////////////////////////////
internal enum HS {
_err = -1, // an error state
Start = 0,
S400 = 1, // a Hebrew digit 400
S400_400 = 2, // Two Hebrew digit 400
S400_X00 = 3, // Two Hebrew digit 400 and followed by 100
S400_X0 = 4, // Hebrew digit 400 and followed by 10 ~ 90
X00_DQ = 5, // A hundred number and followed by a double quote.
S400_X00_X0 = 6,
X0_DQ = 7, // A two-digit number and followed by a double quote.
X = 8, // A single digit Hebrew number.
X0 = 9, // A two-digit Hebrew number
X00 = 10, // A three-digit Hebrew number
S400_DQ = 11, // A Hebrew digit 400 and followed by a double quote.
S400_400_DQ = 12,
S400_400_100 = 13,
S9 = 14, // Hebrew digit 9
X00_S9 = 15, // A hundered number and followed by a digit 9
S9_DQ = 16, // Hebrew digit 9 and followed by a double quote
END = 100, // A terminial state is reached.
}
//
// The state machine for Hebrew number pasing.
//
readonly static HS[][] NumberPasingState = {
// 400 300/200 100 90~10 8~1 6, 7, 9, ' "
/* 0 */ new HS[] {HS.S400, HS.X00, HS.X00, HS.X0, HS.X, HS.X, HS.X, HS.S9, HS._err, HS._err},
/* 1: S400 */ new HS[] {HS.S400_400, HS.S400_X00, HS.S400_X00, HS.S400_X0, HS._err, HS._err, HS._err, HS.X00_S9 ,HS.END, HS.S400_DQ},
/* 2: S400_400 */ new HS[] {HS._err, HS._err, HS.S400_400_100,HS.S400_X0, HS._err, HS._err, HS._err, HS.X00_S9 ,HS._err, HS.S400_400_DQ},
/* 3: S400_X00 */ new HS[] {HS._err, HS._err, HS._err, HS.S400_X00_X0, HS._err, HS._err, HS._err, HS.X00_S9 ,HS._err, HS.X00_DQ},
/* 4: S400_X0 */ new HS[] {HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS.X0_DQ},
/* 5: X00_DQ */ new HS[] {HS._err, HS._err, HS._err, HS.END, HS.END, HS.END, HS.END, HS.END, HS._err, HS._err},
/* 6: S400_X00_X0 */new HS[] {HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS.X0_DQ},
/* 7: X0_DQ */ new HS[] {HS._err, HS._err, HS._err, HS._err, HS.END, HS.END, HS.END, HS.END, HS._err, HS._err},
/* 8: X */ new HS[] {HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS.END, HS._err},
/* 9: X0 */ new HS[] {HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS.END, HS.X0_DQ},
/* 10: X00 */ new HS[] {HS._err, HS._err, HS._err, HS.S400_X0, HS._err, HS._err, HS._err, HS.X00_S9, HS.END, HS.X00_DQ},
/* 11: S400_DQ */ new HS[] {HS.END, HS.END, HS.END, HS.END, HS.END, HS.END, HS.END, HS.END, HS._err, HS._err},
/* 12: S400_400_DQ*/new HS[] {HS._err, HS._err, HS.END, HS.END, HS.END, HS.END, HS.END, HS.END, HS._err, HS._err},
/* 13: S400_400_100*/new HS[]{HS._err, HS._err, HS._err, HS.S400_X00_X0, HS._err, HS._err, HS._err, HS.X00_S9, HS._err, HS.X00_DQ},
/* 14: S9 */ new HS[] {HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err,HS.END, HS.S9_DQ},
/* 15: X00_S9 */ new HS[] {HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS._err, HS.S9_DQ},
/* 16: S9_DQ */ new HS[] {HS._err, HS._err, HS._err, HS._err, HS._err, HS.END, HS.END, HS._err, HS._err, HS._err},
};
////////////////////////////////////////////////////////////////////////
//
// Actions:
// Parse the Hebrew number by passing one character at a time.
// The state between characters are maintained at HebrewNumberPasingContext.
// Returns:
// Return a enum of HebrewNumberParsingState.
// NotHebrewDigit: The specified ch is not a valid Hebrew digit.
// InvalidHebrewNumber: After parsing the specified ch, it will lead into
// an invalid Hebrew number text.
// FoundEndOfHebrewNumber: A terminal state is reached. This means that
// we find a valid Hebrew number text after the specified ch is parsed.
// ContinueParsing: The specified ch is a valid Hebrew digit, and
// it will lead into a valid state in the state machine, we should
// continue to parse incoming characters.
//
////////////////////////////////////////////////////////////////////////
internal static HebrewNumberParsingState ParseByChar(char ch, ref HebrewNumberParsingContext context) {
HebrewToken token;
if (ch == '\'') {
token = HebrewToken.SingleQuote;
} else if (ch == '\"') {
token = HebrewToken.DoubleQuote;
} else {
int index = (int)ch - minHebrewNumberCh;
if (index >= 0 && index < HebrewValues.Length ) {
token = HebrewValues[index].token;
if (token == HebrewToken.Invalid) {
return (HebrewNumberParsingState.NotHebrewDigit);
}
context.result += HebrewValues[index].value;
} else {
// Not in valid Hebrew digit range.
return (HebrewNumberParsingState.NotHebrewDigit);
}
}
context.state = NumberPasingState[(int)context.state][(int)token];
if (context.state == HS._err) {
// Invalid Hebrew state. This indicates an incorrect Hebrew number.
return (HebrewNumberParsingState.InvalidHebrewNumber);
}
if (context.state == HS.END) {
// Reach a terminal state.
return (HebrewNumberParsingState.FoundEndOfHebrewNumber);
}
// We should continue to parse.
return (HebrewNumberParsingState.ContinueParsing);
}
////////////////////////////////////////////////////////////////////////
//
// Actions:
// Check if the ch is a valid Hebrew number digit.
// This function will return true if the specified char is a legal Hebrew
// digit character, single quote, or double quote.
// Returns:
// true if the specified character is a valid Hebrew number character.
//
////////////////////////////////////////////////////////////////////////
internal static bool IsDigit(char ch) {
if (ch >= minHebrewNumberCh && ch <= maxHebrewNumberCh) {
return (HebrewValues[ch - minHebrewNumberCh].value >= 0);
}
return (ch == '\'' || ch == '\"');
}
}
}
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