/[svn]/linuxsampler/trunk/src/scriptvm/scanner.l
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revision 2887 by schoenebeck, Sun Jun 1 14:44:38 2014 UTC revision 2888 by schoenebeck, Sun Apr 24 18:16:10 2016 UTC
# Line 1  Line 1 
1  /*  /*
2   * Copyright (c) 2014 Christian Schoenebeck and Andreas Persson   * Copyright (c) 2014-2016 Christian Schoenebeck and Andreas Persson
3   *   *
4   * http://www.linuxsampler.org   * http://www.linuxsampler.org
5   *   *
# Line 7  Line 7 
7   * See README file for details.   * See README file for details.
8   */   */
9    
10  /* Token scanner for instrument script language. */  /* Token scanner for NKSP real-time instrument script language. */
   
 /* FIXME: line numbers (i.e. on error/warning messages) are incorrect, because  
    the current grammar does not process new line characters. \n is currently  
    filtered out in this lexer. Due to this, the parser will sometimes read  
    several lines before it matches the next complete grammar rule, causing the  
    incorrect lines in the error/warning messages. */  
11    
12  %{  %{
13    
# Line 26  Line 20 
20  {                                       \  {                                       \
21      yylloc->first_line = yylineno;      \      yylloc->first_line = yylineno;      \
22      yylloc->last_line  = yylineno;      \      yylloc->last_line  = yylineno;      \
23      /* first_column = TODO */           \      yylloc->first_column = yycolumn;    \
24      /* last_column  = TODO */           \      yycolumn += yyleng;                 \
25        yylloc->last_column = yycolumn - 1; \
26      /*printf("lex: line '%s'\n", yytext);*/  \      /*printf("lex: line '%s'\n", yytext);*/  \
27  }  }
28  // custom (f)lex input for reading from std::istream object  // custom (f)lex input for reading from std::istream object
# Line 43  Line 38 
38  }  }
39    
40  static void scanner_error(YYLTYPE* locp, LinuxSampler::ParserContext* context, const char* err) {  static void scanner_error(YYLTYPE* locp, LinuxSampler::ParserContext* context, const char* err) {
41      context->addErr(locp->first_line, err);      context->addErr(locp->first_line, locp->first_column, err);
42  }  }
43    
44  static void scanner_warning(YYLTYPE* locp, LinuxSampler::ParserContext* context, const char* txt) {  static void scanner_warning(YYLTYPE* locp, LinuxSampler::ParserContext* context, const char* txt) {
45      context->addWrn(locp->first_line, txt);      context->addWrn(locp->first_line, locp->first_column, txt);
46  }  }
47    
48  #define SCANNER_ERR(txt)  scanner_error(yylloc, yyextra, txt)  #define SCANNER_ERR(txt)  scanner_error(yylloc, yyextra, txt)
# Line 55  static void scanner_warning(YYLTYPE* loc Line 50  static void scanner_warning(YYLTYPE* loc
50    
51  using namespace LinuxSampler;  using namespace LinuxSampler;
52    
53    static int countNewLineChars(const char* txt) {
54        int n = 0;
55        for (int i = 0; txt[i]; ++i)
56            if (txt[i] == '\n') ++n;
57        return n;
58    }
59    
60    static int countCharsPastLastNewLine(const char* txt) {
61        const int n = strlen(txt);
62        for (int i = n - 1; i >= 0; --i)
63            if (txt[i] == '\n')
64                return n - i - 1;
65        return n;
66    }
67    
68    #define processLocation() { \
69        const int nl = countNewLineChars(yytext); \
70        yylineno += nl; \
71        if (nl) yycolumn = countCharsPastLastNewLine(yytext); \
72    }
73    
74  %}  %}
75    
76  /* use Flex's built-in support for line numbers */  /* use Flex's built-in support for line numbers
77  %option yylineno     (disabled, because it seems to be unreliable, so we are using our own
78       tracking code in the respective scanner rules below) */
79    /*%option yylineno*/
80  /* generate a reentrant safe scanner */  /* generate a reentrant safe scanner */
81  %option reentrant  %option reentrant
82  /* avoid symbol collision with other (i.e. future) scanner symbols */  /* avoid symbol collision with other (i.e. future) scanner symbols */
# Line 188  ID       [a-zA-Z0-9_]* Line 206  ID       [a-zA-Z0-9_]*
206      //printf("-->END_USE_CODE\n");      //printf("-->END_USE_CODE\n");
207      yy_pop_state(yyscanner);      yy_pop_state(yyscanner);
208  }  }
209  <PREPROC_BODY_EAT>[ \t\r\n]* /* eat up code block filtered out by preprocessor */  <PREPROC_BODY_EAT>[ \t\r\n]* { /* eat up code block filtered out by preprocessor */
210  <PREPROC_BODY_EAT>.* /* eat up code block filtered out by preprocessor */      processLocation();
211    }
212    <PREPROC_BODY_EAT>.* { /* eat up code block filtered out by preprocessor */
213        processLocation();
214    }
215    
216    
217   /* Language keywords */   /* Language keywords */
# Line 240  on|end|note|init|declare|if|then|begin|e Line 262  on|end|note|init|declare|if|then|begin|e
262  ":=" return ASSIGNMENT;  ":=" return ASSIGNMENT;
263    
264  \n+ {  \n+ {
265         yylineno += countNewLineChars(yytext);
266         yycolumn = 0;
267      //printf("lex: new line %d\n", yylineno, yytext);      //printf("lex: new line %d\n", yylineno, yytext);
268      //return LF;      //return LF;
269  }  }
270    
271  "{"[^}]*"}" /* eat up comments */  "{"[^}]*"}" { /* eat up comments */
272        processLocation();
273    }
274    
275  [ \t\r]+ /* eat up whitespace */  [ \t\r]+ /* eat up whitespace */
276    
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