534 lines
17 KiB
C++
534 lines
17 KiB
C++
/**
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* Scintilla source code edit control
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* @file LexMySQL.cxx
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* Lexer for MySQL
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*
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* Improved by Mike Lischke <mike.lischke@sun.com>
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* Adopted from LexSQL.cxx by Anders Karlsson <anders@mysql.com>
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* Original work by Neil Hodgson <neilh@scintilla.org>
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* Copyright 1998-2005 by Neil Hodgson <neilh@scintilla.org>
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* The License.txt file describes the conditions under which this software may be distributed.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <ctype.h>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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#include "WordList.h"
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#include "LexAccessor.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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static inline bool IsAWordChar(int ch) {
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return (ch < 0x80) && (isalnum(ch) || ch == '_');
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}
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static inline bool IsAWordStart(int ch) {
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return (ch < 0x80) && (isalpha(ch) || ch == '_');
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}
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static inline bool IsADoxygenChar(int ch) {
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return (islower(ch) || ch == '$' || ch == '@' ||
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ch == '\\' || ch == '&' || ch == '<' ||
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ch == '>' || ch == '#' || ch == '{' ||
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ch == '}' || ch == '[' || ch == ']');
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}
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static inline bool IsANumberChar(int ch) {
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// Not exactly following number definition (several dots are seen as OK, etc.)
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// but probably enough in most cases.
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return (ch < 0x80) &&
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(isdigit(ch) || toupper(ch) == 'E' ||
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ch == '.' || ch == '-' || ch == '+');
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}
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//--------------------------------------------------------------------------------------------------
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/**
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* Check if the current content context represent a keyword and set the context state if so.
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*/
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static void CheckForKeyword(StyleContext& sc, WordList* keywordlists[])
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{
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int length = sc.LengthCurrent() + 1; // +1 for the next char
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char* s = new char[length];
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sc.GetCurrentLowered(s, length);
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if (keywordlists[0]->InList(s))
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sc.ChangeState(SCE_MYSQL_MAJORKEYWORD);
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else
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if (keywordlists[1]->InList(s))
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sc.ChangeState(SCE_MYSQL_KEYWORD);
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else
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if (keywordlists[2]->InList(s))
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sc.ChangeState(SCE_MYSQL_DATABASEOBJECT);
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else
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if (keywordlists[3]->InList(s))
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sc.ChangeState(SCE_MYSQL_FUNCTION);
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else
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if (keywordlists[5]->InList(s))
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sc.ChangeState(SCE_MYSQL_PROCEDUREKEYWORD);
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else
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if (keywordlists[6]->InList(s))
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sc.ChangeState(SCE_MYSQL_USER1);
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else
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if (keywordlists[7]->InList(s))
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sc.ChangeState(SCE_MYSQL_USER2);
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else
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if (keywordlists[8]->InList(s))
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sc.ChangeState(SCE_MYSQL_USER3);
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delete [] s;
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}
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//--------------------------------------------------------------------------------------------------
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static void ColouriseMySQLDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
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Accessor &styler)
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{
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StyleContext sc(startPos, length, initStyle, styler);
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for (; sc.More(); sc.Forward())
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{
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// Determine if the current state should terminate.
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switch (sc.state)
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{
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case SCE_MYSQL_OPERATOR:
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sc.SetState(SCE_MYSQL_DEFAULT);
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break;
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case SCE_MYSQL_NUMBER:
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// We stop the number definition on non-numerical non-dot non-eE non-sign char.
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if (!IsANumberChar(sc.ch))
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sc.SetState(SCE_MYSQL_DEFAULT);
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break;
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case SCE_MYSQL_IDENTIFIER:
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// Switch from identifier to keyword state and open a new state for the new char.
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if (!IsAWordChar(sc.ch))
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{
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CheckForKeyword(sc, keywordlists);
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// Additional check for function keywords needed.
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// A function name must be followed by an opening parenthesis.
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if (sc.state == SCE_MYSQL_FUNCTION && sc.ch != '(')
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sc.ChangeState(SCE_MYSQL_DEFAULT);
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sc.SetState(SCE_MYSQL_DEFAULT);
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}
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break;
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case SCE_MYSQL_VARIABLE:
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if (!IsAWordChar(sc.ch))
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sc.SetState(SCE_MYSQL_DEFAULT);
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break;
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case SCE_MYSQL_SYSTEMVARIABLE:
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if (!IsAWordChar(sc.ch))
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{
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int length = sc.LengthCurrent() + 1;
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char* s = new char[length];
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sc.GetCurrentLowered(s, length);
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// Check for known system variables here.
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if (keywordlists[4]->InList(&s[2]))
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sc.ChangeState(SCE_MYSQL_KNOWNSYSTEMVARIABLE);
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delete [] s;
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sc.SetState(SCE_MYSQL_DEFAULT);
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}
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break;
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case SCE_MYSQL_QUOTEDIDENTIFIER:
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if (sc.ch == '`')
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{
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if (sc.chNext == '`')
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sc.Forward(); // Ignore it
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else
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sc.ForwardSetState(SCE_MYSQL_DEFAULT);
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}
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break;
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case SCE_MYSQL_COMMENT:
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case SCE_MYSQL_HIDDENCOMMAND:
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if (sc.Match('*', '/'))
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{
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sc.Forward();
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sc.ForwardSetState(SCE_MYSQL_DEFAULT);
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}
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break;
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case SCE_MYSQL_COMMENTLINE:
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if (sc.atLineStart)
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sc.SetState(SCE_MYSQL_DEFAULT);
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break;
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case SCE_MYSQL_SQSTRING:
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if (sc.ch == '\\')
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sc.Forward(); // Escape sequence
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else
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if (sc.ch == '\'')
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{
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// End of single quoted string reached?
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if (sc.chNext == '\'')
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sc.Forward();
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else
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sc.ForwardSetState(SCE_MYSQL_DEFAULT);
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}
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break;
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case SCE_MYSQL_DQSTRING:
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if (sc.ch == '\\')
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sc.Forward(); // Escape sequence
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else
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if (sc.ch == '\"')
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{
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// End of single quoted string reached?
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if (sc.chNext == '\"')
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sc.Forward();
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else
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sc.ForwardSetState(SCE_MYSQL_DEFAULT);
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}
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break;
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}
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// Determine if a new state should be entered.
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if (sc.state == SCE_MYSQL_DEFAULT)
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{
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switch (sc.ch)
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{
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case '@':
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if (sc.chNext == '@')
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{
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sc.SetState(SCE_MYSQL_SYSTEMVARIABLE);
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sc.Forward(2); // Skip past @@.
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}
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else
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if (IsAWordStart(sc.ch))
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{
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sc.SetState(SCE_MYSQL_VARIABLE);
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sc.Forward(); // Skip past @.
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}
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else
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sc.SetState(SCE_MYSQL_OPERATOR);
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break;
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case '`':
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sc.SetState(SCE_MYSQL_QUOTEDIDENTIFIER);
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break;
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case '#':
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sc.SetState(SCE_MYSQL_COMMENTLINE);
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break;
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case '\'':
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sc.SetState(SCE_MYSQL_SQSTRING);
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break;
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case '\"':
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sc.SetState(SCE_MYSQL_DQSTRING);
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break;
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default:
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if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext)))
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sc.SetState(SCE_MYSQL_NUMBER);
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else
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if (IsAWordStart(sc.ch))
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sc.SetState(SCE_MYSQL_IDENTIFIER);
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else
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if (sc.Match('/', '*'))
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{
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sc.SetState(SCE_MYSQL_COMMENT);
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// Skip comment introducer and check for hidden command.
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sc.Forward(2);
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if (sc.ch == '!')
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{
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sc.ChangeState(SCE_MYSQL_HIDDENCOMMAND);
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sc.Forward();
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}
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}
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else
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if (sc.Match("--"))
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{
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// Special MySQL single line comment.
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sc.SetState(SCE_MYSQL_COMMENTLINE);
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sc.Forward(2);
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// Check the third character too. It must be a space or EOL.
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if (sc.ch != ' ' && sc.ch != '\n' && sc.ch != '\r')
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sc.ChangeState(SCE_MYSQL_OPERATOR);
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}
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else
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if (isoperator(static_cast<char>(sc.ch)))
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sc.SetState(SCE_MYSQL_OPERATOR);
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}
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}
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}
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// Do a final check for keywords if we currently have an identifier, to highlight them
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// also at the end of a line.
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if (sc.state == SCE_MYSQL_IDENTIFIER)
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{
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CheckForKeyword(sc, keywordlists);
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// Additional check for function keywords needed.
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// A function name must be followed by an opening parenthesis.
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if (sc.state == SCE_MYSQL_FUNCTION && sc.ch != '(')
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sc.ChangeState(SCE_MYSQL_DEFAULT);
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}
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sc.Complete();
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}
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//--------------------------------------------------------------------------------------------------
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/**
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* Helper function to determine if we have a foldable comment currently.
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*/
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static bool IsStreamCommentStyle(int style)
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{
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return style == SCE_MYSQL_COMMENT;
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}
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//--------------------------------------------------------------------------------------------------
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/**
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* Code copied from StyleContext and modified to work here. Should go into Accessor as a
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* companion to Match()...
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*/
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bool MatchIgnoreCase(Accessor &styler, int currentPos, const char *s)
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{
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for (int n = 0; *s; n++)
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{
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if (*s != tolower(styler.SafeGetCharAt(currentPos + n)))
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return false;
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s++;
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}
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return true;
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}
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//--------------------------------------------------------------------------------------------------
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// Store both the current line's fold level and the next lines in the
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// level store to make it easy to pick up with each increment.
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static void FoldMySQLDoc(unsigned int startPos, int length, int initStyle, WordList *[], Accessor &styler)
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{
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bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
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bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
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bool foldOnlyBegin = styler.GetPropertyInt("fold.sql.only.begin", 0) != 0;
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int visibleChars = 0;
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int lineCurrent = styler.GetLine(startPos);
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int levelCurrent = SC_FOLDLEVELBASE;
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if (lineCurrent > 0)
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levelCurrent = styler.LevelAt(lineCurrent - 1) >> 16;
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int levelNext = levelCurrent;
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int styleNext = styler.StyleAt(startPos);
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int style = initStyle;
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bool endPending = false;
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bool whenPending = false;
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bool elseIfPending = false;
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char nextChar = styler.SafeGetCharAt(startPos);
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for (unsigned int i = startPos; length > 0; i++, length--)
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{
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int stylePrev = style;
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style = styleNext;
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styleNext = styler.StyleAt(i + 1);
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char currentChar = nextChar;
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nextChar = styler.SafeGetCharAt(i + 1);
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bool atEOL = (currentChar == '\r' && nextChar != '\n') || (currentChar == '\n');
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switch (style)
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{
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case SCE_MYSQL_COMMENT:
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if (foldComment)
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{
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// Multiline comment style /* .. */.
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if (IsStreamCommentStyle(style))
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{
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// Increase level if we just start a foldable comment.
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if (!IsStreamCommentStyle(stylePrev))
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levelNext++;
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else
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// If we are in the middle of a foldable comment check if it ends now.
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// Don't end at the line end, though.
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if (!IsStreamCommentStyle(styleNext) && !atEOL)
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levelNext--;
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}
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}
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break;
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case SCE_MYSQL_COMMENTLINE:
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if (foldComment)
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{
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// Not really a standard, but we add support for single line comments
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// with special curly braces syntax as foldable comments too.
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// MySQL needs -- comments to be followed by space or control char
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if (styler.Match(i, "--"))
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{
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char chNext2 = styler.SafeGetCharAt(i + 2);
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char chNext3 = styler.SafeGetCharAt(i + 3);
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if (chNext2 == '{' || chNext3 == '{')
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levelNext++;
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else
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if (chNext2 == '}' || chNext3 == '}')
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levelNext--;
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}
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}
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break;
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case SCE_MYSQL_HIDDENCOMMAND:
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if (endPending)
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{
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// A conditional command is not a white space so it should end the current block
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// before opening a new one.
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endPending = false;
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levelNext--;
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if (levelNext < SC_FOLDLEVELBASE)
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levelNext = SC_FOLDLEVELBASE;
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}
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if (style != stylePrev)
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levelNext++;
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else
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if (style != styleNext)
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{
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levelNext--;
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if (levelNext < SC_FOLDLEVELBASE)
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levelNext = SC_FOLDLEVELBASE;
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}
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break;
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case SCE_MYSQL_OPERATOR:
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if (endPending)
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{
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endPending = false;
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levelNext--;
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if (levelNext < SC_FOLDLEVELBASE)
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levelNext = SC_FOLDLEVELBASE;
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}
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if (currentChar == '(')
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levelNext++;
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else
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if (currentChar == ')')
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{
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levelNext--;
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if (levelNext < SC_FOLDLEVELBASE)
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levelNext = SC_FOLDLEVELBASE;
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}
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break;
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case SCE_MYSQL_MAJORKEYWORD:
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case SCE_MYSQL_KEYWORD:
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case SCE_MYSQL_FUNCTION:
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case SCE_MYSQL_PROCEDUREKEYWORD:
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// Reserved and other keywords.
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if (style != stylePrev)
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{
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// END decreases the folding level, regardless which keyword follows.
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bool endFound = MatchIgnoreCase(styler, i, "end");
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if (endPending)
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{
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levelNext--;
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if (levelNext < SC_FOLDLEVELBASE)
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levelNext = SC_FOLDLEVELBASE;
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}
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else
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if (!endFound)
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{
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if (MatchIgnoreCase(styler, i, "begin"))
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levelNext++;
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else
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{
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if (!foldOnlyBegin)
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{
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bool whileFound = MatchIgnoreCase(styler, i, "while");
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bool loopFound = MatchIgnoreCase(styler, i, "loop");
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bool repeatFound = MatchIgnoreCase(styler, i, "repeat");
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bool caseFound = MatchIgnoreCase(styler, i, "case");
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if (whileFound || loopFound || repeatFound || caseFound)
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levelNext++;
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else
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{
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// IF alone does not increase the fold level as it is also used in non-block'ed
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// code like DROP PROCEDURE blah IF EXISTS.
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// Instead THEN opens the new level (if not part of an ELSEIF or WHEN (case) branch).
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if (MatchIgnoreCase(styler, i, "then"))
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{
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if (!elseIfPending && !whenPending)
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levelNext++;
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else
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{
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elseIfPending = false;
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whenPending = false;
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}
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}
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else
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{
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// Neither of if/then/while/loop/repeat/case, so check for
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// sub parts of IF and CASE.
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if (MatchIgnoreCase(styler, i, "elseif"))
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elseIfPending = true;
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if (MatchIgnoreCase(styler, i, "when"))
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whenPending = true;
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}
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}
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}
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}
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}
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// Keep the current end state for the next round.
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endPending = endFound;
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}
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break;
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default:
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if (!isspace(currentChar) && endPending)
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{
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// END followed by a non-whitespace character (not covered by other cases like identifiers)
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// also should end a folding block. Typical case: END followed by self defined delimiter.
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levelNext--;
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if (levelNext < SC_FOLDLEVELBASE)
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levelNext = SC_FOLDLEVELBASE;
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}
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break;
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}
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if (atEOL)
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{
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// Apply the new folding level to this line.
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// Leave pending states as they are otherwise a line break will de-sync
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// code folding and valid syntax.
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int levelUse = levelCurrent;
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int lev = levelUse | levelNext << 16;
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if (visibleChars == 0 && foldCompact)
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lev |= SC_FOLDLEVELWHITEFLAG;
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if (levelUse < levelNext)
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lev |= SC_FOLDLEVELHEADERFLAG;
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if (lev != styler.LevelAt(lineCurrent))
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styler.SetLevel(lineCurrent, lev);
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lineCurrent++;
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levelCurrent = levelNext;
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visibleChars = 0;
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}
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if (!isspacechar(currentChar))
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visibleChars++;
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}
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}
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//--------------------------------------------------------------------------------------------------
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static const char * const mysqlWordListDesc[] = {
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"Major Keywords",
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"Keywords",
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"Database Objects",
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"Functions",
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"System Variables",
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"Procedure keywords",
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"User Keywords 1",
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"User Keywords 2",
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"User Keywords 3",
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0
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};
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LexerModule lmMySQL(SCLEX_MYSQL, ColouriseMySQLDoc, "mysql", FoldMySQLDoc, mysqlWordListDesc);
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