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larsbrubaker
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362
Community.CsharpSqlite/src/complete_c.cs
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362
Community.CsharpSqlite/src/complete_c.cs
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using System.Diagnostics;
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namespace Community.CsharpSqlite
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{
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using u8 = System.Byte;
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public partial class Sqlite3
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{
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/*
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** 2001 September 15
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** An tokenizer for SQL
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**
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** This file contains C code that implements the sqlite3_complete() API.
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** This code used to be part of the tokenizer.c source file. But by
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** separating it out, the code will be automatically omitted from
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** static links that do not use it.
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*************************************************************************
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** Included in SQLite3 port to C#-SQLite; 2008 Noah B Hart
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** C#-SQLite is an independent reimplementation of the SQLite software library
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**
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** SQLITE_SOURCE_ID: 2010-08-23 18:52:01 42537b60566f288167f1b5864a5435986838e3a3
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**
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*************************************************************************
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*/
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//#include "sqliteInt.h"
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#if !SQLITE_OMIT_COMPLETE
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/*
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** This is defined in tokenize.c. We just have to import the definition.
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*/
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#if !SQLITE_AMALGAMATION
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#if SQLITE_ASCII
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//#define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0)
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static bool IdChar( u8 C )
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{
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return ( sqlite3CtypeMap[(char)C] & 0x46 ) != 0;
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}
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#endif
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//#if SQLITE_EBCDIC
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//extern const char sqlite3IsEbcdicIdChar[];
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//#define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40]))
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//#endif
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#endif // * SQLITE_AMALGAMATION */
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/*
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** Token types used by the sqlite3_complete() routine. See the header
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** comments on that procedure for additional information.
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*/
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const int tkSEMI = 0;
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const int tkWS = 1;
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const int tkOTHER = 2;
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#if !SQLITE_OMIT_TRIGGER
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const int tkEXPLAIN = 3;
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const int tkCREATE = 4;
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const int tkTEMP = 5;
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const int tkTRIGGER = 6;
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const int tkEND = 7;
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#endif
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/*
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** Return TRUE if the given SQL string ends in a semicolon.
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**
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** Special handling is require for CREATE TRIGGER statements.
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** Whenever the CREATE TRIGGER keywords are seen, the statement
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** must end with ";END;".
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**
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** This implementation uses a state machine with 8 states:
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**
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** (0) INVALID We have not yet seen a non-whitespace character.
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**
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** (1) START At the beginning or end of an SQL statement. This routine
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** returns 1 if it ends in the START state and 0 if it ends
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** in any other state.
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**
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** (2) NORMAL We are in the middle of statement which ends with a single
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** semicolon.
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**
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** (3) EXPLAIN The keyword EXPLAIN has been seen at the beginning of
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** a statement.
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**
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** (4) CREATE The keyword CREATE has been seen at the beginning of a
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** statement, possibly preceeded by EXPLAIN and/or followed by
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** TEMP or TEMPORARY
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**
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** (5) TRIGGER We are in the middle of a trigger definition that must be
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** ended by a semicolon, the keyword END, and another semicolon.
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**
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** (6) SEMI We've seen the first semicolon in the ";END;" that occurs at
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** the end of a trigger definition.
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**
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** (7) END We've seen the ";END" of the ";END;" that occurs at the end
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** of a trigger difinition.
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**
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** Transitions between states above are determined by tokens extracted
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** from the input. The following tokens are significant:
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**
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** (0) tkSEMI A semicolon.
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** (1) tkWS Whitespace.
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** (2) tkOTHER Any other SQL token.
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** (3) tkEXPLAIN The "explain" keyword.
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** (4) tkCREATE The "create" keyword.
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** (5) tkTEMP The "temp" or "temporary" keyword.
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** (6) tkTRIGGER The "trigger" keyword.
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** (7) tkEND The "end" keyword.
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**
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** Whitespace never causes a state transition and is always ignored.
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** This means that a SQL string of all whitespace is invalid.
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**
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** If we compile with SQLITE_OMIT_TRIGGER, all of the computation needed
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** to recognize the end of a trigger can be omitted. All we have to do
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** is look for a semicolon that is not part of an string or comment.
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*/
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static public int sqlite3_complete( string zSql )
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{
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int state = 0; /* Current state, using numbers defined in header comment */
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int token; /* Value of the next token */
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#if !SQLITE_OMIT_TRIGGER
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/* A complex statement machine used to detect the end of a CREATE TRIGGER
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** statement. This is the normal case.
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*/
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u8[][] trans = new u8[][] {
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/* Token: */
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/* State: ** SEMI WS OTHER EXPLAIN CREATE TEMP TRIGGER END */
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/* 0 INVALID: */ new u8[]{ 1, 0, 2, 3, 4, 2, 2, 2, },
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/* 1 START: */ new u8[]{ 1, 1, 2, 3, 4, 2, 2, 2, },
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/* 2 NORMAL: */ new u8[]{ 1, 2, 2, 2, 2, 2, 2, 2, },
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/* 3 EXPLAIN: */ new u8[]{ 1, 3, 3, 2, 4, 2, 2, 2, },
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/* 4 CREATE: */ new u8[]{ 1, 4, 2, 2, 2, 4, 5, 2, },
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/* 5 TRIGGER: */ new u8[]{ 6, 5, 5, 5, 5, 5, 5, 5, },
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/* 6 SEMI: */ new u8[]{ 6, 6, 5, 5, 5, 5, 5, 7, },
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/* 7 END: */ new u8[]{ 1, 7, 5, 5, 5, 5, 5, 5, },
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};
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#else
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/* If triggers are not supported by this compile then the statement machine
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** used to detect the end of a statement is much simplier
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*/
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u8[][] trans = new u8[][] {
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/* Token: */
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/* State: ** SEMI WS OTHER */
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/* 0 INVALID: */new u8[] { 1, 0, 2, },
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/* 1 START: */new u8[] { 1, 1, 2, },
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/* 2 NORMAL: */new u8[] { 1, 2, 2, },
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};
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#endif // * SQLITE_OMIT_TRIGGER */
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int zIdx = 0;
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while ( zIdx < zSql.Length )
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{
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switch ( zSql[zIdx] )
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{
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case ';':
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{ /* A semicolon */
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token = tkSEMI;
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break;
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}
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case ' ':
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case '\r':
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case '\t':
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case '\n':
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case '\f':
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{ /* White space is ignored */
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token = tkWS;
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break;
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}
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case '/':
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{ /* C-style comments */
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if ( zSql[zIdx + 1] != '*' )
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{
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token = tkOTHER;
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break;
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}
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zIdx += 2;
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while ( zIdx < zSql.Length && zSql[zIdx] != '*' || zIdx < zSql.Length - 1 && zSql[zIdx + 1] != '/' )
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{
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zIdx++;
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}
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if ( zIdx == zSql.Length )
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return 0;
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zIdx++;
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token = tkWS;
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break;
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}
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case '-':
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{ /* SQL-style comments from "--" to end of line */
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if ( zSql[zIdx + 1] != '-' )
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{
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token = tkOTHER;
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break;
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}
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while ( zIdx < zSql.Length && zSql[zIdx] != '\n' )
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{
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zIdx++;
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}
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if ( zIdx == zSql.Length )
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return state == 1 ? 1 : 0;//if( *zSql==0 ) return state==1;
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token = tkWS;
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break;
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}
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case '[':
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{ /* Microsoft-style identifiers in [...] */
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zIdx++;
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while ( zIdx < zSql.Length && zSql[zIdx] != ']' )
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{
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zIdx++;
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}
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if ( zIdx == zSql.Length )
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return 0;
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token = tkOTHER;
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break;
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}
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case '`': /* Grave-accent quoted symbols used by MySQL */
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case '"': /* single- and double-quoted strings */
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case '\'':
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{
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int c = zSql[zIdx];
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zIdx++;
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while ( zIdx < zSql.Length && zSql[zIdx] != c )
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{
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zIdx++;
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}
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if ( zIdx == zSql.Length )
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return 0;
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token = tkOTHER;
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break;
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}
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default:
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{
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//#if SQLITE_EBCDIC
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// unsigned char c;
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//#endif
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if ( IdChar( (u8)zSql[zIdx] ) )
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{
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/* Keywords and unquoted identifiers */
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int nId;
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for ( nId = 1; ( zIdx + nId ) < zSql.Length && IdChar( (u8)zSql[zIdx + nId] ); nId++ )
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{
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}
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#if SQLITE_OMIT_TRIGGER
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token = tkOTHER;
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#else
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switch ( zSql[zIdx] )
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{
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case 'c':
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case 'C':
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{
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if ( nId == 6 && sqlite3StrNICmp( zSql, zIdx, "create", 6 ) == 0 )
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{
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token = tkCREATE;
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}
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else
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{
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token = tkOTHER;
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}
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break;
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}
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case 't':
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case 'T':
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{
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if ( nId == 7 && sqlite3StrNICmp( zSql, zIdx, "trigger", 7 ) == 0 )
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{
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token = tkTRIGGER;
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}
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else if ( nId == 4 && sqlite3StrNICmp( zSql, zIdx, "temp", 4 ) == 0 )
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{
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token = tkTEMP;
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}
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else if ( nId == 9 && sqlite3StrNICmp( zSql, zIdx, "temporary", 9 ) == 0 )
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{
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token = tkTEMP;
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}
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else
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{
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token = tkOTHER;
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}
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break;
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}
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case 'e':
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case 'E':
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{
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if ( nId == 3 && sqlite3StrNICmp( zSql, zIdx, "end", 3 ) == 0 )
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{
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token = tkEND;
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}
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else
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#if !SQLITE_OMIT_EXPLAIN
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if ( nId == 7 && sqlite3StrNICmp( zSql, zIdx, "explain", 7 ) == 0 )
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{
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token = tkEXPLAIN;
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}
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else
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#endif
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{
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token = tkOTHER;
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}
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break;
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}
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default:
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{
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token = tkOTHER;
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break;
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}
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}
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#endif // * SQLITE_OMIT_TRIGGER */
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zIdx += nId - 1;
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}
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else
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{
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/* Operators and special symbols */
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token = tkOTHER;
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}
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break;
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}
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}
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state = trans[state][token];
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zIdx++;
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}
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return ( state == 1 ) ? 1 : 0;//return state==1;
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}
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#if !SQLITE_OMIT_UTF16
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/*
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** This routine is the same as the sqlite3_complete() routine described
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** above, except that the parameter is required to be UTF-16 encoded, not
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** UTF-8.
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*/
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int sqlite3_complete16(const void *zSql){
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sqlite3_value pVal;
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char const *zSql8;
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int rc = SQLITE_NOMEM;
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#if !SQLITE_OMIT_AUTOINIT
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rc = sqlite3_initialize();
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if( rc !=0) return rc;
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#endif
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pVal = sqlite3ValueNew(0);
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sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
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zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
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if( zSql8 ){
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rc = sqlite3_complete(zSql8);
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}else{
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rc = SQLITE_NOMEM;
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}
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sqlite3ValueFree(pVal);
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return sqlite3ApiExit(0, rc);
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}
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#endif // * SQLITE_OMIT_UTF16 */
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#endif // * SQLITE_OMIT_COMPLETE */
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}
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}
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