| 1 |
/* |
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* Copyright (c) 2014-2017 Christian Schoenebeck and Andreas Persson |
| 3 |
* |
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* http://www.linuxsampler.org |
| 5 |
* |
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* This file is part of LinuxSampler and released under the same terms. |
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* See README file for details. |
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*/ |
| 9 |
|
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/* Token scanner for NKSP real-time instrument script language. */ |
| 11 |
|
| 12 |
%{ |
| 13 |
|
| 14 |
#include "parser_shared.h" |
| 15 |
#include <math.h> |
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// reentrant scanner data context |
| 17 |
#define YY_EXTRA_TYPE ParserContext* |
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// set line number each time a token is recognized |
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#define YY_USER_ACTION \ |
| 20 |
{ \ |
| 21 |
yylloc->first_line = yylineno; \ |
| 22 |
yylloc->last_line = yylineno; \ |
| 23 |
yylloc->first_column = yycolumn; \ |
| 24 |
yylloc->first_byte = yyextra->nbytes; \ |
| 25 |
yylloc->length_bytes = (int) yyleng; \ |
| 26 |
yycolumn += yyleng; \ |
| 27 |
yyextra->nbytes += (int) yyleng; \ |
| 28 |
yylloc->last_column = yycolumn - 1; \ |
| 29 |
/*printf("lex: line '%s'\n", yytext);*/ \ |
| 30 |
} |
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// custom (f)lex input for reading from std::istream object |
| 32 |
#define YY_INPUT(buf,result,max_size) \ |
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{ \ |
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char c = yyextra->is->get(); \ |
| 35 |
if (yyextra->is->eof()) \ |
| 36 |
result = YY_NULL; \ |
| 37 |
else { \ |
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buf[0] = c; \ |
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result = 1; \ |
| 40 |
} \ |
| 41 |
} |
| 42 |
|
| 43 |
static void scanner_error(YYLTYPE* locp, LinuxSampler::ParserContext* context, const char* err) { |
| 44 |
context->addErr(locp->first_line, locp->last_line, locp->first_column, |
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locp->last_column, locp->first_byte, locp->length_bytes, |
| 46 |
err); |
| 47 |
} |
| 48 |
|
| 49 |
static void scanner_warning(YYLTYPE* locp, LinuxSampler::ParserContext* context, const char* txt) { |
| 50 |
context->addWrn(locp->first_line, locp->last_line, locp->first_column, |
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locp->last_column, locp->first_byte, locp->length_bytes, |
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txt); |
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} |
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|
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#define SCANNER_ERR(txt) scanner_error(yylloc, yyextra, txt) |
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#define SCANNER_WRN(txt) scanner_warning(yylloc, yyextra, txt) |
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|
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// shut up warning that 'register' keyword is deprecated as of C++11 |
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#if defined(__cplusplus) && __cplusplus >= 201103L |
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# define register |
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#endif |
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|
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using namespace LinuxSampler; |
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|
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static int countNewLineChars(const char* txt) { |
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int n = 0; |
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for (int i = 0; txt[i]; ++i) |
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if (txt[i] == '\n') ++n; |
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return n; |
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} |
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|
| 72 |
static int countCharsPastLastNewLine(const char* txt) { |
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const int n = (int)strlen(txt); |
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for (int i = n - 1; i >= 0; --i) |
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if (txt[i] == '\n') |
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return n - i - 1; |
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return n; |
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} |
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|
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#define processLocation() { \ |
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const int nl = countNewLineChars(yytext); \ |
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yylineno += nl; \ |
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if (nl) yycolumn = countCharsPastLastNewLine(yytext); \ |
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} |
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|
| 86 |
// if compiled for debugging, throw an exception instead of exiting on fatal |
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// lexer errors (so the debugger may pause with the appropriate back trace) |
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#if DEBUG |
| 89 |
# include <stdexcept> |
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# define YY_FATAL_ERROR(msg) throw std::runtime_error(msg) |
| 91 |
#endif |
| 92 |
|
| 93 |
%} |
| 94 |
|
| 95 |
/* use Flex's built-in support for line numbers |
| 96 |
(disabled, because it seems to be unreliable, so we are using our own |
| 97 |
tracking code in the respective scanner rules below) */ |
| 98 |
/*%option yylineno*/ |
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/* generate a reentrant safe scanner */ |
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%option reentrant |
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/* avoid symbol collision with other (i.e. future) scanner symbols */ |
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%option prefix="InstrScript_" |
| 103 |
/* bison-bridge adds an argument yylval to yylex, and bison-locations adds an |
| 104 |
argument code yylloc for location tracking. */ |
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%option bison-bridge |
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%option bison-locations |
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/* yywrap() would be called at EOF, we don't need it */ |
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%option noyywrap |
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/* enable functions yy_push_state(), yy_pop_state(), yy_top_state() */ |
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%option stack |
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|
| 112 |
/* inclusive scanner conditions */ |
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%s PREPROC_BODY_USE |
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/* exclusive scanner conditions */ |
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%x PREPROC_SET_COND PREPROC_RESET_COND PREPROC_IF PREPROC_IF_NOT PREPROC_BODY_EAT PREPROC_PRE_BODY_USE PREPROC_PRE_BODY_EAT |
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|
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DIGIT [0-9] |
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ID [a-zA-Z][a-zA-Z0-9_]* |
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METRIC (k|h|(da)|d|c|m|u) |
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UNIT (s|(Hz)|B) |
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|
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%% |
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|
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\"[^"]*\" { |
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char* s = strdup(yytext + 1); |
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s[strlen(s) - 1] = '\0'; |
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yylval->sValue = s; |
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yyextra->autoFreeAfterParse(s); |
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return STRING; |
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} |
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|
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{DIGIT}+ { |
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if (sizeof(vmint) < 8) |
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yylval->iValue = atoi(yytext); |
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else |
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yylval->iValue = atoll(yytext); |
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return INTEGER; |
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} |
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|
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{DIGIT}+"."{DIGIT}+ { |
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yylval->fValue = atof(yytext); |
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return REAL; |
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} |
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|
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{DIGIT}+({METRIC}{1,2}|({METRIC}{0,2}{UNIT}?)) { |
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int pos = 0; |
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|
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// parse number portion |
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vmint value = 0; |
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for (; yytext[pos] >= '0' && yytext[pos] <= '9'; ++pos) { |
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value *= 10; |
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value += yytext[pos] - '0'; |
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} |
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yylval->iUnitValue.iValue = value; |
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|
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// parse metric prefix portion |
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for (int i = 0; i < 2; ++i, ++pos) { |
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switch (yytext[pos]) { |
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case 'k': yylval->iUnitValue.prefix[i] = VM_KILO; continue; |
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case 'h': yylval->iUnitValue.prefix[i] = VM_HECTO; continue; |
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case 'c': yylval->iUnitValue.prefix[i] = VM_CENTI; continue; |
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case 'm': yylval->iUnitValue.prefix[i] = VM_MILLI; continue; |
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case 'u': yylval->iUnitValue.prefix[i] = VM_MICRO; continue; |
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case 'd': |
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if (yytext[pos+1] == 'a') { |
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yylval->iUnitValue.prefix[i] = VM_DECA; |
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++pos; |
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} else { |
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yylval->iUnitValue.prefix[i] = VM_DECI; |
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} |
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continue; |
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default: |
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yylval->iUnitValue.prefix[i] = VM_NO_PREFIX; |
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goto parseIntStdUnit; |
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} |
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} |
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|
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parseIntStdUnit: |
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|
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// parse standard measurement unit |
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switch (yytext[pos]) { |
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case 's': yylval->iUnitValue.unit = VM_SECOND; break; |
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case 'H': yylval->iUnitValue.unit = VM_HERTZ; break; |
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case 'B': yylval->iUnitValue.unit = VM_BEL; break; |
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default: yylval->iUnitValue.unit = VM_NO_UNIT; break; |
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} |
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|
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return INTEGER_UNIT; |
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} |
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|
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{DIGIT}+"."{DIGIT}+({METRIC}{1,2}|({METRIC}{0,2}{UNIT}?)) { |
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int pos = 0; |
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|
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// parse number portion |
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for (; (yytext[pos] >= '0' && yytext[pos] <= '9') || yytext[pos] == '.'; ++pos) { |
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} |
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{ |
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const char tmp = yytext[pos]; |
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yytext[pos] = 0; // mark temporary end of string |
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yylval->fUnitValue.fValue = atof(yytext); |
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yytext[pos] = tmp; // restore |
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} |
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|
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// parse metric prefix portion |
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for (int i = 0; i < 2; ++i, ++pos) { |
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switch (yytext[pos]) { |
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case 'k': yylval->fUnitValue.prefix[i] = VM_KILO; continue; |
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case 'h': yylval->fUnitValue.prefix[i] = VM_HECTO; continue; |
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case 'c': yylval->fUnitValue.prefix[i] = VM_CENTI; continue; |
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case 'm': yylval->fUnitValue.prefix[i] = VM_MILLI; continue; |
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case 'u': yylval->fUnitValue.prefix[i] = VM_MICRO; continue; |
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case 'd': |
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if (yytext[pos+1] == 'a') { |
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yylval->fUnitValue.prefix[i] = VM_DECA; |
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++pos; |
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} else { |
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yylval->fUnitValue.prefix[i] = VM_DECI; |
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} |
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continue; |
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default: |
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yylval->fUnitValue.prefix[i] = VM_NO_PREFIX; |
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goto parseRealStdUnit; |
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} |
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} |
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|
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parseRealStdUnit: |
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|
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// parse standard measurement unit |
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switch (yytext[pos]) { |
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case 's': yylval->fUnitValue.unit = VM_SECOND; break; |
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case 'H': yylval->fUnitValue.unit = VM_HERTZ; break; |
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case 'B': yylval->fUnitValue.unit = VM_BEL; break; |
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default: yylval->fUnitValue.unit = VM_NO_UNIT; break; |
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} |
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|
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return REAL_UNIT; |
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} |
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|
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|
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/* Preprocessor statement: SET_CONDITION(name) */ |
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|
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<*>"SET_CONDITION"[ \t]*"(" { |
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//printf("SET_CONDITION\n"); |
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yy_push_state(PREPROC_SET_COND, yyscanner); |
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} |
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<PREPROC_SET_COND>{ID} { |
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//printf("preproc set condition '%s'\n", yytext); |
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bool success = yyextra->setPreprocessorCondition(yytext); |
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if (!success) { |
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SCANNER_WRN((String("Preprocessor: Condition '") + |
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yytext + "' is already set.").c_str()); |
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} |
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} |
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<PREPROC_SET_COND>[ \t]*")" { |
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//printf("End of PREPROC_SET_COND\n"); |
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yy_pop_state(yyscanner); |
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} |
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|
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|
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/* Preprocessor statement: RESET_CONDITION(name) */ |
| 261 |
|
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<*>"RESET_CONDITION"[ \t]*"(" { |
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//printf("RESET_CONDITION\n"); |
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yy_push_state(PREPROC_RESET_COND, yyscanner); |
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} |
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<PREPROC_RESET_COND>{ID} { |
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//printf("preproc reset condition '%s'\n", yytext); |
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bool success = yyextra->resetPreprocessorCondition(yytext); |
| 269 |
if (!success) { |
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SCANNER_ERR((String("Preprocessor: could not reset condition '") + |
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yytext + "' (either not set or a built-in condition).").c_str()); |
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} |
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} |
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<PREPROC_RESET_COND>[ \t]*")" { |
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//printf("End of RESET_CONDITION\n"); |
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yy_pop_state(yyscanner); |
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} |
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|
| 279 |
|
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/* Preprocessor conditional statements: |
| 281 |
|
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USE_CODE_IF(name) |
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... |
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END_USE_CODE |
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|
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and: |
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|
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USE_CODE_IF_NOT(name) |
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... |
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END_USE_CODE |
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*/ |
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|
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<*>"USE_CODE_IF"[ \t]*"(" { |
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//printf("{%s}\n", yytext); |
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yy_push_state(PREPROC_IF, yyscanner); |
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} |
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<PREPROC_BODY_EAT>"USE_CODE_IF"[ \t]*"("{ID}")" { |
| 298 |
//printf("[EAT{%s}\n", yytext); |
| 299 |
yy_push_state(PREPROC_BODY_EAT, yyscanner); |
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} |
| 301 |
<*>"USE_CODE_IF_NOT"[ \t]*"(" { |
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//printf("USE_CODE_IF_NOT\n"); |
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yy_push_state(PREPROC_IF_NOT, yyscanner); |
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} |
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<PREPROC_BODY_EAT>"USE_CODE_IF_NOT"[ \t]*"("{ID}")" { |
| 306 |
//printf("[EAT{%s}\n", yytext); |
| 307 |
yy_push_state(PREPROC_BODY_EAT, yyscanner); |
| 308 |
} |
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<PREPROC_IF>{ID} { |
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//printf("preproc use code if '%s'\n", yytext); |
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yy_pop_state(yyscanner); |
| 312 |
if (yyextra->isPreprocessorConditionSet(yytext)) |
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yy_push_state(PREPROC_PRE_BODY_USE, yyscanner); |
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else |
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yy_push_state(PREPROC_PRE_BODY_EAT, yyscanner); |
| 316 |
} |
| 317 |
<PREPROC_IF_NOT>{ID} { |
| 318 |
//printf("preproc use code if not '%s'\n", yytext); |
| 319 |
yy_pop_state(yyscanner); |
| 320 |
if (!yyextra->isPreprocessorConditionSet(yytext)) |
| 321 |
yy_push_state(PREPROC_PRE_BODY_USE, yyscanner); |
| 322 |
else |
| 323 |
yy_push_state(PREPROC_PRE_BODY_EAT, yyscanner); |
| 324 |
} |
| 325 |
<PREPROC_PRE_BODY_USE>[ \t]*")" { |
| 326 |
yy_pop_state(yyscanner); |
| 327 |
yy_push_state(PREPROC_BODY_USE, yyscanner); |
| 328 |
} |
| 329 |
<PREPROC_PRE_BODY_EAT>[ \t]*")" { |
| 330 |
//printf("PREPROCESSOR EAT : {%s}\n", yytext); |
| 331 |
yy_pop_state(yyscanner); |
| 332 |
yy_push_state(PREPROC_BODY_EAT, yyscanner); |
| 333 |
} |
| 334 |
<PREPROC_BODY_EAT,PREPROC_BODY_USE>"END_USE_CODE" { |
| 335 |
//printf("-->END_USE_CODE\n"); |
| 336 |
yy_pop_state(yyscanner); |
| 337 |
} |
| 338 |
<PREPROC_BODY_EAT>[ \t\r\n]* { /* eat up code block filtered out by preprocessor */ |
| 339 |
//printf("PREPROCESSOR EAT2 : {%s}\n", yytext); |
| 340 |
processLocation(); |
| 341 |
} |
| 342 |
<PREPROC_BODY_EAT>.* { /* eat up code block filtered out by preprocessor */ |
| 343 |
//printf("PREPROCESSOR EAT3 : {%s}\n", yytext); |
| 344 |
yyextra->addPreprocessorComment(yylloc->first_line, yylloc->last_line, |
| 345 |
yylloc->first_column+1, yylloc->last_column+1, |
| 346 |
yylloc->first_byte, yylloc->length_bytes); |
| 347 |
} |
| 348 |
|
| 349 |
|
| 350 |
/* Language keywords */ |
| 351 |
|
| 352 |
"on" return ON; |
| 353 |
"end" return END; |
| 354 |
"note" return NOTE; |
| 355 |
"init" return INIT; |
| 356 |
"declare" return DECLARE; |
| 357 |
"while" return WHILE; |
| 358 |
"if" return IF; |
| 359 |
".or." return BITWISE_OR; |
| 360 |
"or" return OR; |
| 361 |
"release" return RELEASE; |
| 362 |
".and." return BITWISE_AND; |
| 363 |
"and" return AND; |
| 364 |
".not." return BITWISE_NOT; |
| 365 |
"not" return NOT; |
| 366 |
"else" return ELSE; |
| 367 |
"controller" return CONTROLLER; |
| 368 |
"rpn" return RPN; |
| 369 |
"nrpn" return NRPN; |
| 370 |
"case" return CASE; |
| 371 |
"select" return SELECT; |
| 372 |
"to" return TO; |
| 373 |
"<=" return LE; |
| 374 |
">=" return GE; |
| 375 |
"const" return CONST_; // note: "CONST" is already defined for C/C++ compilers on Windows by default |
| 376 |
"polyphonic" return POLYPHONIC; |
| 377 |
"patch" return PATCH; |
| 378 |
"mod" return MOD; |
| 379 |
"function" return FUNCTION; |
| 380 |
"call" return CALL; |
| 381 |
"synchronized" return SYNCHRONIZED; |
| 382 |
|
| 383 |
[&,!()[\]<>=*+#\/-] { |
| 384 |
return *yytext; |
| 385 |
} |
| 386 |
|
| 387 |
("$"|"@"|"%"|"~"|"?"){ID} { |
| 388 |
yylval->sValue = strdup(yytext); |
| 389 |
yyextra->autoFreeAfterParse(yylval->sValue); |
| 390 |
return VARIABLE; |
| 391 |
} |
| 392 |
|
| 393 |
{ID} { |
| 394 |
yylval->sValue = strdup(yytext); |
| 395 |
yyextra->autoFreeAfterParse(yylval->sValue); |
| 396 |
return IDENTIFIER; |
| 397 |
} |
| 398 |
|
| 399 |
":=" return ASSIGNMENT; |
| 400 |
|
| 401 |
\n+ { |
| 402 |
yylineno += countNewLineChars(yytext); |
| 403 |
yycolumn = 0; |
| 404 |
//printf("lex: new line %d\n", yylineno, yytext); |
| 405 |
//return LF; |
| 406 |
} |
| 407 |
|
| 408 |
"{"[^}]*"}" { /* eat up comments */ |
| 409 |
processLocation(); |
| 410 |
} |
| 411 |
|
| 412 |
[ \t\r]+ /* eat up whitespace */ |
| 413 |
|
| 414 |
. { |
| 415 |
printf( "Unrecognized character: '%s' (line %d, column %d)\n", yytext, yylineno, yycolumn); |
| 416 |
return UNKNOWN_CHAR; |
| 417 |
} |
| 418 |
|
| 419 |
%% |
| 420 |
|
| 421 |
namespace LinuxSampler { |
| 422 |
|
| 423 |
void ParserContext::createScanner(std::istream* is) { |
| 424 |
if (scanner) destroyScanner(); |
| 425 |
this->is = is; |
| 426 |
yylex_init(&scanner); |
| 427 |
yyset_extra(this, scanner); |
| 428 |
} |
| 429 |
|
| 430 |
void ParserContext::destroyScanner() { |
| 431 |
if (!scanner) return; |
| 432 |
yylex_destroy(scanner); |
| 433 |
scanner = NULL; |
| 434 |
} |
| 435 |
|
| 436 |
} // namespace LinuxSampler |
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