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/* |
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* Copyright (c) 2014-2016 Christian Schoenebeck and Andreas Persson |
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* |
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* http://www.linuxsampler.org |
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* |
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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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*/ |
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|
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/* Token scanner for NKSP real-time instrument script language. */ |
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|
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%{ |
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|
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#include "parser_shared.h" |
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#include <math.h> |
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// reentrant scanner data context |
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#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 \ |
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{ \ |
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yylloc->first_line = yylineno; \ |
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yylloc->last_line = yylineno; \ |
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yylloc->first_column = yycolumn; \ |
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yycolumn += yyleng; \ |
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yylloc->last_column = yycolumn - 1; \ |
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/*printf("lex: line '%s'\n", yytext);*/ \ |
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} |
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// custom (f)lex input for reading from std::istream object |
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#define YY_INPUT(buf,result,max_size) \ |
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{ \ |
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char c = yyextra->is->get(); \ |
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if (yyextra->is->eof()) \ |
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result = YY_NULL; \ |
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else { \ |
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buf[0] = c; \ |
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result = 1; \ |
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} \ |
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} |
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|
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static void scanner_error(YYLTYPE* locp, LinuxSampler::ParserContext* context, const char* err) { |
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context->addErr(locp->first_line, locp->first_column, err); |
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} |
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|
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static void scanner_warning(YYLTYPE* locp, LinuxSampler::ParserContext* context, const char* txt) { |
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context->addWrn(locp->first_line, locp->first_column, 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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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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|
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static int countCharsPastLastNewLine(const char* txt) { |
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const int n = 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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|
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%} |
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|
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/* use Flex's built-in support for line numbers |
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(disabled, because it seems to be unreliable, so we are using our own |
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tracking code in the respective scanner rules below) */ |
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/*%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_" |
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/* bison-bridge adds an argument yylval to yylex, and bison-locations adds an |
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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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|
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/* 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-Z0-9_]* |
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|
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%% |
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|
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\"[^"]*\" { |
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yylval->sValue = strdup(yytext + 1); |
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yylval->sValue[strlen(yylval->sValue) - 1] = '\0'; |
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return STRING; |
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} |
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|
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{DIGIT}+ { |
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yylval->iValue = atoi(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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printf("A float: %s (%g)\n", yytext, atof(yytext)); |
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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) */ |
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|
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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); |
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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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|
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|
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/* Preprocessor conditional statements: |
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|
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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("USE_CODE_IF\n"); |
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yy_push_state(PREPROC_IF, yyscanner); |
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} |
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<*>"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_IF>{ID} { |
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//printf("preproc use code if '%s'\n", yytext); |
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yy_pop_state(yyscanner); |
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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); |
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} |
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<PREPROC_IF_NOT>{ID} { |
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//printf("preproc use code if not '%s'\n", yytext); |
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yy_pop_state(yyscanner); |
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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); |
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} |
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<PREPROC_PRE_BODY_USE>[ \t]*")" { |
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yy_pop_state(yyscanner); |
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yy_push_state(PREPROC_BODY_USE, yyscanner); |
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} |
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<PREPROC_PRE_BODY_EAT>[ \t]*")" { |
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//printf("PREPROCESSOR EAT : \n"); |
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yy_pop_state(yyscanner); |
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yy_push_state(PREPROC_BODY_EAT, yyscanner); |
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} |
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<*>.*"END_USE_CODE" { |
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//printf("-->END_USE_CODE\n"); |
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yy_pop_state(yyscanner); |
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} |
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<PREPROC_BODY_EAT>[ \t\r\n]* { /* eat up code block filtered out by preprocessor */ |
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processLocation(); |
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} |
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<PREPROC_BODY_EAT>.* { /* eat up code block filtered out by preprocessor */ |
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processLocation(); |
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} |
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|
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|
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/* Language keywords */ |
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|
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"on" return ON; |
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"end" return END; |
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"note" return NOTE; |
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"init" return INIT; |
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"declare" return DECLARE; |
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"while" return WHILE; |
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"if" return IF; |
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"or" return OR; |
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"release" return RELEASE; |
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"and" return AND; |
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"not" return NOT; |
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"else" return ELSE; |
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"controller" return CONTROLLER; |
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"case" return CASE; |
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"select" return SELECT; |
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"to" return TO; |
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"<=" return LE; |
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">=" return GE; |
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"const" return CONST_; // note: "CONST" is already defined for C/C++ compilers on Windows by default |
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"polyphonic" return POLYPHONIC; |
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"mod" return MOD; |
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|
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on|end|note|init|declare|if|then|begin|end|procedure|function { |
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printf("A keyword: %s\n", yytext); |
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} |
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|
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[&,()[\]<>=*+#/-] { return *yytext; } |
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|
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("$"|"@"){ID} { |
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yylval->sValue = strdup(yytext); |
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return VARIABLE; |
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} |
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|
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"%"{ID} { |
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yylval->sValue = strdup(yytext); |
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return VARIABLE; |
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} |
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|
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{ID} { |
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yylval->sValue = strdup(yytext); |
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return IDENTIFIER; |
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} |
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|
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":=" return ASSIGNMENT; |
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|
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\n+ { |
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yylineno += countNewLineChars(yytext); |
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yycolumn = 0; |
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//printf("lex: new line %d\n", yylineno, yytext); |
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//return LF; |
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} |
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|
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"{"[^}]*"}" { /* eat up comments */ |
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processLocation(); |
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} |
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|
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[ \t\r]+ /* eat up whitespace */ |
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|
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"..." /* eat up */ |
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|
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. printf( "Unrecognized character: %s\n", yytext ); |
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|
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%% |
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|
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namespace LinuxSampler { |
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|
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void ParserContext::createScanner(std::istream* is) { |
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if (scanner) destroyScanner(); |
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this->is = is; |
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yylex_init(&scanner); |
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yyset_extra(this, scanner); |
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} |
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|
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void ParserContext::destroyScanner() { |
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if (!scanner) return; |
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yylex_destroy(scanner); |
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scanner = NULL; |
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} |
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|
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} // namespace LinuxSampler |
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