src/stc/scintilla/src/LexAsn1.cxx

   1 // Scintilla source code edit control
   2 /** @file LexAsn1.cxx
   3  ** Lexer for ASN.1
   4  **/
   5 // Copyright 2004 by Herr Pfarrer rpfarrer <at> yahoo <dot> de
   6 // Last Updated: 20/07/2004
   7 // The License.txt file describes the conditions under which this software may be distributed.
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <ctype.h>
  11 #include <stdio.h>
  12 #include <stdarg.h>
  13
  14 #include "Platform.h"
  15
  16 #include "PropSet.h"
  17 #include "Accessor.h"
  18 #include "StyleContext.h"
  19 #include "KeyWords.h"
  20 #include "Scintilla.h"
  21 #include "SciLexer.h"
  22
  23 #ifdef SCI_NAMESPACE
  24 using namespace Scintilla;
  25 #endif
  26
  27 // Some char test functions
  28 static bool isAsn1Number(int ch)
  29 {
  30         return (ch >= '0' && ch <= '9');
  31 }
  32
  33 static bool isAsn1Letter(int ch)
  34 {
  35         return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z');
  36 }
  37
  38 static bool isAsn1Char(int ch)
  39 {
  40         return (ch == '-' ) || isAsn1Number(ch) || isAsn1Letter (ch);
  41 }
  42
  43 //
  44 //      Function determining the color of a given code portion
  45 //      Based on a "state"
  46 //
  47 static void ColouriseAsn1Doc(unsigned int startPos, int length, int initStyle, WordList *keywordLists[], Accessor &styler)
  48 {
  49         // The keywords
  50         WordList &Keywords = *keywordLists[0];
  51         WordList &Attributes = *keywordLists[1];
  52         WordList &Descriptors = *keywordLists[2];
  53         WordList &Types = *keywordLists[3];
  54
  55         // Parse the whole buffer character by character using StyleContext
  56         StyleContext sc(startPos, length, initStyle, styler);
  57         for (; sc.More(); sc.Forward())
  58         {
  59                 // The state engine
  60                 switch (sc.state)
  61                 {
  62                 case SCE_ASN1_DEFAULT:          // Plain characters
  63 asn1_default:
  64                         if (sc.ch == '-' && sc.chNext == '-')
  65                                 // A comment begins here
  66                                 sc.SetState(SCE_ASN1_COMMENT);
  67                         else if (sc.ch == '"')
  68                                 // A string begins here
  69                                 sc.SetState(SCE_ASN1_STRING);
  70                         else if (isAsn1Number (sc.ch))
  71                                 // A number starts here (identifier should start with a letter in ASN.1)
  72                                 sc.SetState(SCE_ASN1_SCALAR);
  73                         else if (isAsn1Char (sc.ch))
  74                                 // An identifier starts here (identifier always start with a letter)
  75                                 sc.SetState(SCE_ASN1_IDENTIFIER);
  76                         else if (sc.ch == ':')
  77                                 // A ::= operator starts here
  78                                 sc.SetState(SCE_ASN1_OPERATOR);
  79                         break;
  80                 case SCE_ASN1_COMMENT:          // A comment
  81                         if (sc.ch == '\r' || sc.ch == '\n')
  82                                 // A comment ends here
  83                                 sc.SetState(SCE_ASN1_DEFAULT);
  84                         break;
  85                 case SCE_ASN1_IDENTIFIER:       // An identifier (keyword, attribute, descriptor or type)
  86                         if (!isAsn1Char (sc.ch))
  87                         {
  88                                 // The end of identifier is here: we can look for it in lists by now and change its state
  89                                 char s[100];
  90                                 sc.GetCurrent(s, sizeof(s));
  91                                 if (Keywords.InList(s))
  92                                         // It's a keyword, change its state
  93                                         sc.ChangeState(SCE_ASN1_KEYWORD);
  94                                 else if (Attributes.InList(s))
  95                                         // It's an attribute, change its state
  96                                         sc.ChangeState(SCE_ASN1_ATTRIBUTE);
  97                                 else if (Descriptors.InList(s))
  98                                         // It's a descriptor, change its state
  99                                         sc.ChangeState(SCE_ASN1_DESCRIPTOR);
 100                                 else if (Types.InList(s))
 101                                         // It's a type, change its state
 102                                         sc.ChangeState(SCE_ASN1_TYPE);
 103
 104                                 // Set to default now
 105                                 sc.SetState(SCE_ASN1_DEFAULT);
 106                         }
 107                         break;
 108                 case SCE_ASN1_STRING:           // A string delimited by ""
 109                         if (sc.ch == '"')
 110                         {
 111                                 // A string ends here
 112                                 sc.ForwardSetState(SCE_ASN1_DEFAULT);
 113
 114                                 // To correctly manage a char sticking to the string quote
 115                                 goto asn1_default;
 116                         }
 117                         break;
 118                 case SCE_ASN1_SCALAR:           // A plain number
 119                         if (!isAsn1Number (sc.ch))
 120                                 // A number ends here
 121                                 sc.SetState(SCE_ASN1_DEFAULT);
 122                         break;
 123                 case SCE_ASN1_OPERATOR:         // The affectation operator ::= and wath follows (eg: ::= { org 6 } OID or ::= 12 trap)
 124                         if (sc.ch == '{')
 125                         {
 126                                 // An OID definition starts here: enter the sub loop
 127                                 for (; sc.More(); sc.Forward())
 128                                 {
 129                                         if (isAsn1Number (sc.ch) && (!isAsn1Char (sc.chPrev) || isAsn1Number (sc.chPrev)))
 130                                                 // The OID number is highlighted
 131                                                 sc.SetState(SCE_ASN1_OID);
 132                                         else if (isAsn1Char (sc.ch))
 133                                                 // The OID parent identifier is plain
 134                                                 sc.SetState(SCE_ASN1_IDENTIFIER);
 135                                         else
 136                                                 sc.SetState(SCE_ASN1_DEFAULT);
 137
 138                                         if (sc.ch == '}')
 139                                                 // Here ends the OID and the operator sub loop: go back to main loop
 140                                                 break;
 141                                 }
 142                         }
 143                         else if (isAsn1Number (sc.ch))
 144                         {
 145                                 // A trap number definition starts here: enter the sub loop
 146                                 for (; sc.More(); sc.Forward())
 147                                 {
 148                                         if (isAsn1Number (sc.ch))
 149                                                 // The trap number is highlighted
 150                                                 sc.SetState(SCE_ASN1_OID);
 151                                         else
 152                                         {
 153                                                 // The number ends here: go back to main loop
 154                                                 sc.SetState(SCE_ASN1_DEFAULT);
 155                                                 break;
 156                                         }
 157                                 }
 158                         }
 159                         else if (sc.ch != ':' && sc.ch != '=' && sc.ch != ' ')
 160                                 // The operator doesn't imply an OID definition nor a trap, back to main loop
 161                                 goto asn1_default; // To be sure to handle actually the state change
 162                         break;
 163                 }
 164         }
 165         sc.Complete();
 166 }
 167
 168 static void FoldAsn1Doc(unsigned int, int, int, WordList *[], Accessor &styler)
 169 {
 170         // No folding enabled, no reason to continue...
 171         if( styler.GetPropertyInt("fold") == 0 )
 172                 return;
 173
 174         // No folding implemented: doesn't make sense for ASN.1
 175 }
 176
 177 static const char * const asn1WordLists[] = {
 178         "Keywords",
 179         "Attributes",
 180         "Descriptors",
 181         "Types",
 182         0, };
 183
 184
 185 LexerModule lmAns1(SCLEX_ASN1, ColouriseAsn1Doc, "asn1", FoldAsn1Doc, asn1WordLists);