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/* |
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* Copyright (c) 2015-2019 Christian Schoenebeck |
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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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/* Token scanner used for generating syntax highlighting for NKSP instrument |
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script language code (this is not used by the sampler itself, but rather |
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provided for external script editor applications). */ |
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%{ |
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#include "NkspScanner.h" |
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// reentrant scanner data context |
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#define YY_EXTRA_TYPE NkspScanner* |
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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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// handle position (line, column) for each recognized token |
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#define YY_USER_ACTION \ |
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yyextra->line = yylineno - 1; \ |
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yyextra->column = yycolumn; \ |
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yycolumn += yyleng; |
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using namespace LinuxSampler; |
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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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// 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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// Since this parser is solely used by script code editors, thus not used in a |
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// real-time context, always 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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#include <stdexcept> |
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#define YY_FATAL_ERROR(msg) throw std::runtime_error(msg) |
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%} |
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/* generate a reentrant safe scanner */ |
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%option reentrant |
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/* avoid symbol collision with ones of other scanners */ |
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%option prefix="Nksp_" |
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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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/* 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 PREPROC_EVENT_NAME PREPROC_END_NAME |
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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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END_ID on|while|if|select|function|synchronized |
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%% |
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\"[^"]*\" { |
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yyextra->token = StringLiteralToken(yytext); |
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return yyextra->token.baseType; |
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} |
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{DIGIT}+ { |
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yyextra->token = NumberLiteralToken(yytext); |
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return yyextra->token.baseType; |
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} |
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{DIGIT}+({METRIC}{1,2}|({METRIC}{0,2}{UNIT}?)) { |
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yyextra->token = NumberLiteralToken(yytext); |
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return yyextra->token.baseType; |
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} |
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/* there is currently no support for floating point numbers in NKSP yet */ |
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/*{DIGIT}+"."{DIGIT}* { |
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yyextra->token = NumberLiteralToken(yytext); |
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return yyextra->token.baseType; |
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}*/ |
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/* Preprocessor statement: SET_CONDITION(name) */ |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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} |
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/* Preprocessor statement: RESET_CONDITION(name) */ |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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} |
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/* Preprocessor conditional statements: |
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USE_CODE_IF(name) |
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... |
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END_USE_CODE |
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and: |
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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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<*>"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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yy_push_state(PREPROC_PRE_BODY_USE, yyscanner); |
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//yy_push_state(PREPROC_PRE_BODY_EAT, yyscanner); |
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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yy_push_state(PREPROC_PRE_BODY_USE, yyscanner); |
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//yy_push_state(PREPROC_PRE_BODY_EAT, yyscanner); |
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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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yyextra->token = PreprocessorToken(yytext); |
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return yyextra->token.baseType; |
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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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<PREPROC_BODY_EAT>.* /* eat up code block filtered out by preprocessor */ |
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/* Event Handler Names (only if they occur alone in a document!) */ |
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^\s*(init|note|release|controller) { |
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yyextra->token = EventHandlerNameToken(yytext); |
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return yyextra->token.baseType; |
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} |
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/* Language keywords */ |
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on { |
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yy_push_state(PREPROC_EVENT_NAME, yyscanner); |
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yyextra->token = KeywordToken(yytext); |
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return yyextra->token.baseType; |
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} |
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<PREPROC_EVENT_NAME>[ \t]*{ID} { |
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yy_pop_state(yyscanner); |
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yyextra->token = EventHandlerNameToken(yytext); |
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return yyextra->token.baseType; |
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} |
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end { |
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yy_push_state(PREPROC_END_NAME, yyscanner); |
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yyextra->token = KeywordToken(yytext); |
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return yyextra->token.baseType; |
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} |
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<PREPROC_END_NAME>[ \t]*{END_ID}? { |
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yy_pop_state(yyscanner); |
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yyextra->token = KeywordToken(yytext); |
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return yyextra->token.baseType; |
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} |
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".or."|".and."|".not." { |
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yyextra->token = KeywordToken(yytext); |
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return yyextra->token.baseType; |
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} |
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declare|while|if|or|and|not|else|case|select|to|mod|const|polyphonic|function|call|synchronized { |
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yyextra->token = KeywordToken(yytext); |
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return yyextra->token.baseType; |
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} |
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/* Variables */ |
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"$"{ID} { |
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yyextra->token = IntegerVariableToken(yytext); |
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return yyextra->token.baseType; |
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} |
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"@"{ID} { |
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yyextra->token = StringVariableToken(yytext); |
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return yyextra->token.baseType; |
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} |
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"%"{ID} { |
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yyextra->token = ArrayVariableToken(yytext); |
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return yyextra->token.baseType; |
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} |
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{ID} { |
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yyextra->token = IdentifierToken(yytext); |
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return yyextra->token.baseType; |
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} |
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/* other */ |
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<*>\n { |
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yyextra->token = NewLineToken(); |
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++yylineno; |
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yycolumn = 0; |
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return yyextra->token.baseType; |
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} |
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"{"[^}]*"}" { |
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yyextra->token = CommentToken(yytext); |
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yylineno += countNewLineChars(yytext); |
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return yyextra->token.baseType; |
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} |
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<*>\t { |
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yyextra->token = OtherToken(" "); |
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return yyextra->token.baseType; |
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} |
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\r+ /* eat up \r */ |
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<<EOF>> { |
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yyextra->token = EofToken(); |
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yyterminate(); |
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} |
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<*>. { |
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yyextra->token = OtherToken(yytext); |
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return yyextra->token.baseType; |
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} |
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%% |
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namespace LinuxSampler { |
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int NkspScanner::processScanner() { |
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return Nksp_lex(scanner); |
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} |
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void NkspScanner::createScanner(std::istream* is) { |
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if (scanner) destroyScanner(); |
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this->is = is; |
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Nksp_lex_init(&scanner); |
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Nksp_set_extra(this, scanner); |
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} |
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void NkspScanner::destroyScanner() { |
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if (!scanner) return; |
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Nksp_lex_destroy(scanner); |
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scanner = NULL; |
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} |
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} // namespace LinuxSampler |