├── .idea ├── .name ├── .gitignore ├── yacc_bison_practice.iml ├── codeStyles │ └── codeStyleConfig.xml ├── vcs.xml ├── misc.xml └── modules.xml ├── cmake-build-debug ├── CMakeFiles │ ├── progress.marks │ ├── clion-environment.txt │ ├── test.dir │ │ ├── link.txt │ │ ├── progress.make │ │ ├── test.c.o │ │ ├── depend.make │ │ ├── flags.make │ │ ├── depend.internal │ │ ├── cmake_clean.cmake │ │ ├── C.includecache │ │ ├── DependInfo.cmake │ │ └── build.make │ ├── cmake.check_cache │ ├── 3.16.5 │ │ ├── CompilerIdC │ │ │ └── a.out │ │ ├── CompilerIdCXX │ │ │ └── a.out │ │ ├── CMakeDetermineCompilerABI_C.bin │ │ ├── CMakeDetermineCompilerABI_CXX.bin │ │ ├── CMakeSystem.cmake │ │ ├── CMakeCCompiler.cmake │ │ └── CMakeCXXCompiler.cmake │ ├── clion-log.txt │ ├── CMakeDirectoryInformation.cmake │ ├── TargetDirectories.txt │ └── Makefile.cmake ├── ch2 │ ├── 3.txt │ ├── CMakeFiles │ │ ├── progress.marks │ │ ├── 2.03_read_files.dir │ │ │ ├── progress.make │ │ │ ├── link.txt │ │ │ ├── depend.make │ │ 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/home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch1/1.06/1.06_calculator_with_bison.tab.c 10 | stdio.h 11 | - 12 | stddef.h 13 | - 14 | libintl.h 15 | - 16 | alloca.h 17 | - 18 | malloc.h 19 | - 20 | stdlib.h 21 | - 22 | stdlib.h 23 | - 24 | stdio.h 25 | - 26 | 27 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch1/1.06/1.06_calculator_with_bison.tab.h 28 | 29 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch1/1.06/1.06lexer.c 30 | stdio.h 31 | - 32 | string.h 33 | - 34 | errno.h 35 | - 36 | stdlib.h 37 | - 38 | inttypes.h 39 | - 40 | 1.06_calculator_with_bison.tab.h 41 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch1/1.06/1.06_calculator_with_bison.tab.h 42 | unistd.h 43 | - 44 | 45 | -------------------------------------------------------------------------------- /cmake-build-debug/ch1/1.06/CMakeFiles/1.06.dir/DependInfo.cmake: 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21 | 22 | # Fortran module output directory. 23 | set(CMAKE_Fortran_TARGET_MODULE_DIR "") 24 | -------------------------------------------------------------------------------- /ch3/3.05/scanner.h: -------------------------------------------------------------------------------- 1 | // file: scanner.h 2 | // Created by cmp on 2020/5/11. 3 | // 4 | 5 | #ifndef FLEX_BISON_SCANNER_H 6 | #define FLEX_BISON_SCANNER_H 7 | 8 | /***********************************/ 9 | /*对yyFlexLexer进行继承，获得更多的控制 10 | * 11 | ***********************************/ 12 | 13 | /* 重要 */ 14 | #if !defined(yyFlexLexerOnce) 15 | #undef yyFlexLexer 16 | #define yyFlexLexer Marker_FlexLexer // 根据prefix修改 17 | 18 | #include 19 | 20 | #endif 21 | /* 替换默认的get_next_token定义 */ 22 | #undef YY_DECL 23 | #define YY_DECL Marker::Parser::symbol_type Marker::Scanner::nextToken() 24 | 25 | #include "parser.hpp" 26 | 27 | namespace Marker { 28 | class Driver; 29 | 30 | class Scanner : public yyFlexLexer { 31 | private: 32 | /* data */ 33 | Driver &_driver; 34 | 35 | public: 36 | Scanner(Marker::Driver &driver) : _driver(driver) {} 37 | 38 | virtual Marker::Parser::symbol_type nextToken(); // 不需要手动实现这个函数，Flex会生成YY_DECL宏定义的代码来实现这个函数 39 | 40 | virtual ~Scanner() {} 41 | }; 42 | } /* Marker */ 43 | 44 | 45 | #endif //FLEX_BISON_SCANNER_H 46 | -------------------------------------------------------------------------------- /ch1/1.05_first_calculator_with_bison.y: -------------------------------------------------------------------------------- 1 | /* 2 | // file: 1.05_first_calculator_with_bison.y 3 | // 利用Bison实现四则运算的语法解析器 4 | */ 5 | 6 | %{ 7 | #include 8 | %} 9 | 10 | /* 声明tokens记号，以便于告诉bison在语法分析程序中记号的名称。 11 | // 通常这些记号总是使用大写字母，虽然bison本身并没有这个要求。 */ 12 | %token NUMBER 13 | %token ADD SUB MUL DIV ABS 14 | %token EOL 15 | 16 | 17 | // 没有任何声明的记号的语法符号必须规则的左边出现至少一次。 18 | // 如果一个语法符号既不是声明过的记号，也没有出现在任何规则的左边， 19 | // 它将导致出现一个未声明的错误。 20 | %% 21 | calclist: /* 空规则 -- 起始符号（start symbol）有时也称为目标符号（goal symbol） */ 22 | | calclist exp EOL { printf("- %d\n", $2); } // EOL 代表一个表达式的结束。像flex一样，大括号中的表示规则的动作 23 | ; 24 | 25 | exp: factor // default $$ = $1 26 | | exp ADD factor { $$ = $1 + $3; } 27 | | exp SUB factor { $$ = $1 - $3; } 28 | ; // represent the termination of this rule. 29 | 30 | factor: term // default $$ = $1 31 | | factor MUL term { $$ = $1 * $3; } 32 | | factor DIV term { $$ = $1 / $3; } 33 | ; 34 | 35 | term: NUMBER // default $$ = $1 36 | | ABS term { $$ = $2 >= 0? $2 : - $2; } 37 | ; 38 | %% 39 | int main(int argc, char **argv) 40 | { 41 | return yyparse(); 42 | } 43 | void yyerror(char *s) 44 | { 45 | fprintf(stderr, "error: %s\n", s); 46 | } -------------------------------------------------------------------------------- /ch2/CMakeLists.txt: -------------------------------------------------------------------------------- 1 | include(${PROJECT_SOURCE_DIR}/cmake/clean_flex_bison_generate_code.cmake) 2 | 3 | execute_process(COMMAND 4 | flex -o ${CMAKE_CURRENT_BINARY_DIR}/2.01_usual_lang_lex_re.c 5 | ${CMAKE_CURRENT_SOURCE_DIR}/2.01_usual_lang_lex_re.l) 6 | 7 | add_executable(2.01_usual_lang_lex_re 8 | 2.01_usual_lang_lex_re.c) 9 | 10 | target_link_libraries(2.01_usual_lang_lex_re PUBLIC 11 | -lfl) 12 | 13 | 14 | execute_process(COMMAND 15 | flex -o ${CMAKE_CURRENT_BINARY_DIR}/2.02_use_yyin_to_read_data_from_file.c 16 | ${CMAKE_CURRENT_SOURCE_DIR}/2.02_use_yyin_to_read_data_from_file.l) 17 | 18 | add_executable(2.02_use_yyin_to_read_data_from_file 19 | 2.02_use_yyin_to_read_data_from_file.c) 20 | 21 | 22 | execute_process(COMMAND 23 | flex -o ${CMAKE_CURRENT_BINARY_DIR}/2.03_read_files.c 24 | ${CMAKE_CURRENT_SOURCE_DIR}/2.03_read_files.l) 25 | 26 | add_executable(2.03_read_files 27 | 2.03_read_files.c) 28 | 29 | 30 | execute_process(COMMAND 31 | flex -o ${CMAKE_CURRENT_BINARY_DIR}/2.06_include_file_and_start_state.c 32 | ${CMAKE_CURRENT_SOURCE_DIR}/2.06_include_file_and_start_state.l) 33 | 34 | add_executable(2.06_include_file_and_start_state 35 | 2.06_include_file_and_start_state.c) -------------------------------------------------------------------------------- /CMakeLists.txt: -------------------------------------------------------------------------------- 1 | 2 | cmake_minimum_required(VERSION 3.14) 3 | project(Flex_Bison) 4 | 5 | 6 | # --- 提交代码前，可以使用这些命令来清除flex和bison生成的文件 --- 7 | #execute_process(COMMAND find ${CMAKE_CURRENT_BINARY_DIR} -type f -perm -111 -name "[1-9].*" -exec rm -f {} \;) 8 | #execute_process(COMMAND find ${CMAKE_CURRENT_BINARY_DIR} -type f -name "*.h" -exec rm -f {} \;) 9 | #execute_process(COMMAND find ${CMAKE_CURRENT_BINARY_DIR} -type f -name "*.c" -exec rm -f {} \;) 10 | #execute_process(COMMAND find ${CMAKE_CURRENT_BINARY_DIR} -type f -name "*.cc" -exec rm -f {} \;) 11 | #execute_process(COMMAND find ${CMAKE_CURRENT_BINARY_DIR} -type f -name "*.hh" -exec rm -f {} \;) 12 | #execute_process(COMMAND find ${CMAKE_CURRENT_BINARY_DIR} -type f -name "*.hpp" -exec rm -f {} \;) 13 | #execute_process(COMMAND find ${CMAKE_CURRENT_BINARY_DIR} -type f -name "*.cpp" -exec rm -f {} \;) 14 | # --- 提交代码前，可以使用这些命令来清除flex和bison生成的文件 --- 15 | 16 | add_subdirectory(ch1) 17 | add_subdirectory(ch2) 18 | add_subdirectory(ch3) 19 | 20 | 21 | #include(${PROJECT_SOURCE_DIR}/cmake/clean_flex_bison_generate_code.cmake) 22 | #execute_process(COMMAND 23 | # flex -o ${CMAKE_CURRENT_BINARY_DIR}/test.c ${CMAKE_CURRENT_SOURCE_DIR}/test.l) 24 | #add_executable(test ${CMAKE_CURRENT_BINARY_DIR}/test.c) 25 | -------------------------------------------------------------------------------- /ch2/2.02_use_yyin_to_read_data_from_file.l: -------------------------------------------------------------------------------- 1 | /* 2 | // file: 2.02_use_yyin_to_read_data_from_file.y 3 | // flex词法分析器默认从stdin读取输入 4 | // 5 | // 除非你对yyin另做安排，词法分析器总是通过yyin文件描述符读取输入，因此为了让flex从文件读取输入 6 | // 你只需要在第一次调用yylex之前重新设定yyin文件描述符 7 | // */ 8 | 9 | /* 10 | // flex和lex总是提供了一个小型的库，叫做-lfl，它定义了默认的main例程，同时也定义了早期lex遗留至今的鸡肋——默认版本的yywrap 11 | // flex的较新的版本允许你在词法分析器的开头设定%option noyywrap，来要求不使用yywrap 12 | // lfl库中的main函数，如下： 13 | // int main() 14 | // { 15 | // while (yylex() != 0); 16 | // return 0; 17 | // } 18 | // 如果你在flex程序使用%option noyywrap，并且定义了自己的main函数，你就不需要链接-lfl了。 19 | // */ 20 | %option noyywrap 21 | %{ 22 | int chars = 0; 23 | int words = 0; 24 | int lines = 0; 25 | %} 26 | 27 | %% 28 | [a-zA-Z]+ { words++; chars += strlen(yytext); } 29 | \n { chars++; lines++; } 30 | . { chars++;} 31 | 32 | %% 33 | 34 | int main(int argc, char ** argv) 35 | { 36 | if ( argc > 1 ) { 37 | if (! (yyin = fopen(argv[1], "r" ) )){ 38 | perror(argv[1]); 39 | return 1; 40 | } 41 | printf("[I]>>>Read data from file:%s\n", argv[1]); 42 | }else{ 43 | printf("[I]>>>Read data from stdin.\n"); 44 | } 45 | yylex(); 46 | printf("chars=%8d\n", chars ); 47 | printf("words=%8d\n", words ); 48 | printf("lines=%8d\n", lines ); 49 | return 0; 50 | } -------------------------------------------------------------------------------- /cmake-build-debug/ch3/3.02/CMakeFiles/3.02_create_AST_with_bison.dir/C.includecache: -------------------------------------------------------------------------------- 1 | #IncludeRegexLine: ^[ ]*[#%][ ]*(include|import)[ ]*[<"]([^">]+)([">]) 2 | 3 | #IncludeRegexScan: ^.*$ 4 | 5 | #IncludeRegexComplain: ^$ 6 | 7 | #IncludeRegexTransform: 8 | 9 | ../ch3/3.02/fb3.02.h 10 | 11 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.02/3.02_create_AST_with_bison.tab.c 12 | stdio.h 13 | - 14 | stdlib.h 15 | - 16 | fb3.02.h 17 | 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set(CMAKE_INSTALL_COMPONENT) 27 | endif() 28 | endif() 29 | 30 | # Install shared libraries without execute permission? 31 | if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE) 32 | set(CMAKE_INSTALL_SO_NO_EXE "1") 33 | endif() 34 | 35 | # Is this installation the result of a crosscompile? 36 | if(NOT DEFINED CMAKE_CROSSCOMPILING) 37 | set(CMAKE_CROSSCOMPILING "FALSE") 38 | endif() 39 | 40 | -------------------------------------------------------------------------------- /cmake-build-debug/ch5/cmake_install.cmake: -------------------------------------------------------------------------------- 1 | # Install script for directory: /home/cmp/work_dir/source_code/yacc_bison_practice/ch5 2 | 3 | # Set the install prefix 4 | if(NOT DEFINED CMAKE_INSTALL_PREFIX) 5 | set(CMAKE_INSTALL_PREFIX "/usr/local") 6 | endif() 7 | string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}") 8 | 9 | # Set the install configuration name. 10 | if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME) 11 | if(BUILD_TYPE) 12 | string(REGEX REPLACE "^[^A-Za-z0-9_]+" "" 13 | CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}") 14 | else() 15 | set(CMAKE_INSTALL_CONFIG_NAME "Debug") 16 | endif() 17 | message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"") 18 | endif() 19 | 20 | # Set the component getting installed. 21 | if(NOT CMAKE_INSTALL_COMPONENT) 22 | if(COMPONENT) 23 | message(STATUS "Install component: \"${COMPONENT}\"") 24 | set(CMAKE_INSTALL_COMPONENT "${COMPONENT}") 25 | else() 26 | set(CMAKE_INSTALL_COMPONENT) 27 | endif() 28 | endif() 29 | 30 | # Install shared libraries without execute permission? 31 | if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE) 32 | set(CMAKE_INSTALL_SO_NO_EXE "1") 33 | endif() 34 | 35 | # Is this installation the result of a crosscompile? 36 | if(NOT DEFINED CMAKE_CROSSCOMPILING) 37 | set(CMAKE_CROSSCOMPILING "FALSE") 38 | endif() 39 | 40 | -------------------------------------------------------------------------------- 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-------------------------------------------------------------------------------- 1 | /* 2 | // file: 2.03_read_files.y 3 | // 使用flex读取多个文件作为输入 4 | // 5 | // */ 6 | 7 | %option noyywrap 8 | %{ 9 | int chars = 0; 10 | int words = 0; 11 | int lines = 0; 12 | 13 | int totchars = 0; 14 | int totwords = 0; 15 | int totlines = 0; 16 | %} 17 | 18 | %% 19 | [a-zA-Z]+ { words++; chars += strlen(yytext); } 20 | \n { chars++; lines++; } 21 | . { chars++; } 22 | %% 23 | 24 | #define HEADLINE "file chars words lines \n" 25 | #define STREAMLINE "%-20s%-8d%-8d%-8d\n" 26 | 27 | int main(int argc, char ** argv) 28 | { 29 | int i; 30 | if ( argc < 2 ){ // 读取标准输入 31 | yylex(); 32 | printf(HEADLINE); 33 | printf(STREAMLINE, "STDIN", chars, words, lines); 34 | return 0; 35 | } 36 | printf(HEADLINE); 37 | for(i = 1; i < argc; i++){ 38 | FILE *f = fopen(argv[i], "r"); 39 | if (!f){ 40 | perror(argv[i]); 41 | return 1; 42 | } 43 | // 每打开一个文件，使用yyrestart()函数把打开的文件描述符指定给词法分析器， 44 | // 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/home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/cppcalc.tab.hh 28 | unistd.h 29 | - 30 | 31 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/cppcalc.tab.hh 32 | cstdlib 33 | - 34 | iostream 35 | - 36 | stdexcept 37 | - 38 | string 39 | - 40 | vector 41 | - 42 | stack.hh 43 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/stack.hh 44 | location.hh 45 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/location.hh 46 | 47 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/location.hh 48 | position.hh 49 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/position.hh 50 | 51 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/position.hh 52 | algorithm 53 | - 54 | iostream 55 | - 56 | string 57 | - 58 | 59 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/stack.hh 60 | vector 61 | - 62 | 63 | -------------------------------------------------------------------------------- /ch1/1.01_word_counter.l: -------------------------------------------------------------------------------- 1 | /* file: 1.01_word_counter.y */ 2 | /* 一个字数统计（word_counter）程序，程序读入一个文件然后报告这个文件的行数、单词树和字符数。*/ 3 | /* 以下是Flex的第一部分为定义部分，包含选项、文字块、起始条件和转换等。 */ 4 | /* 文字块存在与%{和%}之间，它们将被原样拷贝到生成文件中。 */ 5 | /* 以空白字符开头的行会被原样拷贝到C文件中。通常用于"\/**\/"之间的多行注释，在每行前面需要有空白字符。 */ 6 | /* 例如：用于声明选项（%option），以及起始条件start condition（使用%x、%s声明） */ 7 | %option noyywrap 8 | 9 | /* %{ 和 %}之间的代码被认为是文字块，会被原样拷贝到生成的文件的开头部分。*/ 10 | %{ 11 | int chars = 0; // 定义变量，用于计数有多少个字符 12 | int words = 0; // 定义变量，用于计数有多少个单词 13 | int lines = 0; // 定义变量，用于计数有多少行 14 | %} 15 | 16 | 17 | /* 以下%%和%%之间是Flex的第二部分为规则部分，该部分定义一些匹配模式（每个模式必须放在行首）和动作（模式匹配成功是所执行的C代码，使用{}括号括住的一行或多行语句）。 18 | 注意： 19 | 在该部分也有%{和%}定义的C代码语句，它们会被原封不动地拷贝到yylex()中。 20 | 在规则部分开头出现的C代码也会出现在yylex的开头，它可以包含词法分析器使用的变量，以及每次yylex()调用时所需运行的代码。 21 | 在其他部分出现的C代码必须仅仅包含注释，因为你无法预知它出现在词法分析器的什么位置。*/ 22 | %% 23 | [a-zA-Z]+ { 24 | words++; 25 | chars += strlen(yytext); // yytext变量总是指向本次匹配的输入文本字符串 26 | } // 当满足正则表达式：[a-zA-Z]+，表示成功识别到了一个单词。words++并且chars增加单词的字符长度 27 | \n {chars++; lines++; } // 当满足正则表达式：\n，表示识别到了换行符。chars++并且lines++ 28 | . {chars++; } // 当满足正则表达式：.，表示识别到了任意一个单词。chars++ 29 | %% 30 | /* 以下是Flex的第三部分为用户子例程部分，该部分会被拷贝到生成的词法分析器里面的C代码。 31 | 它们通常是一些与动作相关的程序代码。 32 | */ 33 | int main(int argc, char **argv) 34 | { 35 | yylex(); // 该函数是词法分析器的主要函数，调用它将进行词法分析 36 | printf("chars=%8d\n",chars); // 打印有多少个字符 37 | printf("words=%8d\n",words); // 打印有多少个单词 38 | printf("lines=%8d\n",lines); // 打印有多少行 39 | return 0; 40 | } 41 | 42 | /* 43 | 注意： 44 | Q：上面的例子可以发现，第三条规则会匹配所有的字符， 45 | 难道它不会也匹配第一个模式所能匹配的单词字母吗？ 46 | A：如果两个模式都匹配的话，flex会选择在程序里面首先出现的那个模式。 47 | */ -------------------------------------------------------------------------------- /ch1/CMakeLists.txt: -------------------------------------------------------------------------------- 1 | include(${PROJECT_SOURCE_DIR}/cmake/clean_flex_bison_generate_code.cmake) 2 | 3 | 4 | execute_process(COMMAND 5 | flex -o ${CMAKE_CURRENT_BINARY_DIR}/1.01_word_counter.c ${CMAKE_CURRENT_SOURCE_DIR}/1.01_word_counter.l) 6 | add_executable(1.01_word_counter ${CMAKE_CURRENT_BINARY_DIR}/1.01_word_counter.c) 7 | target_link_libraries(1.01_word_counter PUBLIC 8 | -lfl) 9 | 10 | execute_process(COMMAND 11 | flex -o ${CMAKE_CURRENT_BINARY_DIR}/1.02_BritishEn_to_AmericanEn.c ${CMAKE_CURRENT_SOURCE_DIR}/1.02_BritishEn_to_AmericanEn.l) 12 | add_executable(1.02_BritishEn_to_AmericanEn ${CMAKE_CURRENT_BINARY_DIR}/1.02_BritishEn_to_AmericanEn.c) 13 | target_link_libraries(1.02_BritishEn_to_AmericanEn PUBLIC 14 | -lfl) 15 | 16 | execute_process(COMMAND 17 | flex -o ${CMAKE_CURRENT_BINARY_DIR}/1.03_recognize_calculator_tokens.c ${CMAKE_CURRENT_SOURCE_DIR}/1.03_recognize_calculator_tokens.l) 18 | add_executable(1.03_recognize_calculator_tokens ${CMAKE_CURRENT_BINARY_DIR}/1.03_recognize_calculator_tokens.c) 19 | target_link_libraries(1.03_recognize_calculator_tokens PUBLIC 20 | -lfl) 21 | 22 | include_directories(${CMAKE_CURRENT_BINARY_DIR}/) 23 | execute_process(COMMAND 24 | flex -o ${CMAKE_CURRENT_BINARY_DIR}/1.04_NextToken_with_Flex.h ${CMAKE_CURRENT_SOURCE_DIR}/1.04_NextToken_with_Flex.l) 25 | add_executable(1.04_NextToken_with_Flex 1.04_main.c) 26 | target_link_libraries(1.04_NextToken_with_Flex PUBLIC 27 | -lfl) 28 | 29 | 30 | execute_process(COMMAND 31 | bison -o ${CMAKE_CURRENT_BINARY_DIR}/1.05_first_calculator_with_bison.c ${CMAKE_CURRENT_SOURCE_DIR}/1.05_first_calculator_with_bison.y) 32 | 33 | 34 | add_subdirectory(1.06) 35 | -------------------------------------------------------------------------------- /ch1/1.06/1.06_calculator_with_bison.y: -------------------------------------------------------------------------------- 1 | /* 2 | // file: 1.05_first_calculator_with_bison.y 3 | // 使用Flex和Bison手写词法分析器和语法分析器，实现一个简单的计算器 4 | // 这是语法解析器部分 5 | */ 6 | 7 | %{ 8 | #include 9 | %} 10 | 11 | /* 声明tokens记号，以便于告诉bison在语法分析程序中记号的名称。 12 | // 通常这些记号总是使用大写字母，虽然bison本身并没有这个要求。 */ 13 | %token NUMBER 14 | %token ADD SUB MUL DIV ABS 15 | %token L_PARENTHESIS R_PARENTHESIS 16 | %token EOL 17 | 18 | %start calclist /* 指定起始符号（start symbol）有时也称为目标符号（goal symbol） */ 19 | 20 | // 下面%%之后的是bison的语法规则部分，语法规则使用的是BNF文法。BNF文法是上下文无关文法（Context-Free Grammar，CFG）的标准格式。 21 | // 注意： 22 | // 没有任何声明的记号的语法符号必须规则的左边出现至少一次。如果一个语法符号既不是声明过的记号，也没有出现在任何规则的左边，它将导致出现一个未声明的错误。 23 | // 24 | %% 25 | calclist: /* -- 空规则，起始符号必须具备一个空规则，旨在让起始符号必须匹配整个输入 -- */ 26 | | calclist exp EOL { printf("= %d\n", $2); } // EOL 代表一个表达式的结束。像flex一样，大括号中的表示规则的动作 27 | ; 28 | 29 | exp: exp ADD factor { $$ = $1 + $3; } // 加法语法规则 30 | | exp SUB factor { $$ = $1 - $3; } // 减法语法规则 31 | | factor 32 | ; // represent the termination of this rule. 33 | 34 | factor: factor MUL term { $$ = $1 * $3; } // 乘法语法规则 35 | | factor DIV term { $$ = $1 / $3; } // 除法语法规则 36 | | term 37 | ; 38 | 39 | term: NUMBER 40 | | ABS exp ABS { $$ = $2 >= 0? $2 : - $2; } // 增加使用绝对值符号的语法规则 41 | | L_PARENTHESIS exp R_PARENTHESIS { $$ = $2; } // 增加使用圆括号的语法规则 42 | ; 43 | %% 44 | int main(int argc, char **argv) 45 | { 46 | // yyparse是语法解析函数，调用yyparse将开始语法解析。 47 | // 该函数读取tokens并语法规则匹配，匹配成功后，执行相应的动作，直到文件的读取结束或者发生不可恢复的错误函数将返回。 48 | // 此外，你也可以在action中使yyparse直接提前返回。 49 | yyparse(); 50 | return 0; 51 | } 52 | int yyerror(char *s) 53 | { 54 | return fprintf(stderr, "error: %s\n", s); 55 | } -------------------------------------------------------------------------------- /cmake-build-debug/ch3/cmake_install.cmake: -------------------------------------------------------------------------------- 1 | # Install script for directory: /home/cmp/work_dir/source_code/yacc_bison_practice/ch3 2 | 3 | # Set the install prefix 4 | if(NOT DEFINED CMAKE_INSTALL_PREFIX) 5 | set(CMAKE_INSTALL_PREFIX "/usr/local") 6 | endif() 7 | string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}") 8 | 9 | # Set the install configuration name. 10 | if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME) 11 | if(BUILD_TYPE) 12 | string(REGEX REPLACE "^[^A-Za-z0-9_]+" "" 13 | CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}") 14 | else() 15 | set(CMAKE_INSTALL_CONFIG_NAME "Debug") 16 | endif() 17 | message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"") 18 | endif() 19 | 20 | # Set the component getting installed. 21 | if(NOT CMAKE_INSTALL_COMPONENT) 22 | if(COMPONENT) 23 | message(STATUS "Install component: \"${COMPONENT}\"") 24 | set(CMAKE_INSTALL_COMPONENT "${COMPONENT}") 25 | else() 26 | set(CMAKE_INSTALL_COMPONENT) 27 | endif() 28 | endif() 29 | 30 | # Install shared libraries without execute permission? 31 | if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE) 32 | set(CMAKE_INSTALL_SO_NO_EXE "1") 33 | endif() 34 | 35 | # Is this installation the result of a crosscompile? 36 | if(NOT DEFINED CMAKE_CROSSCOMPILING) 37 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-------------------------------------------------------------------------------- /cmake-build-debug/cmake_install.cmake: -------------------------------------------------------------------------------- 1 | # Install script for directory: /home/cmp/work_dir/source_code/yacc_bison_practice 2 | 3 | # Set the install prefix 4 | if(NOT DEFINED CMAKE_INSTALL_PREFIX) 5 | set(CMAKE_INSTALL_PREFIX "/usr/local") 6 | endif() 7 | string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}") 8 | 9 | # Set the install configuration name. 10 | if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME) 11 | if(BUILD_TYPE) 12 | string(REGEX REPLACE "^[^A-Za-z0-9_]+" "" 13 | CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}") 14 | else() 15 | set(CMAKE_INSTALL_CONFIG_NAME "Debug") 16 | endif() 17 | message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"") 18 | endif() 19 | 20 | # Set the component getting installed. 21 | if(NOT CMAKE_INSTALL_COMPONENT) 22 | if(COMPONENT) 23 | message(STATUS "Install component: \"${COMPONENT}\"") 24 | set(CMAKE_INSTALL_COMPONENT "${COMPONENT}") 25 | else() 26 | set(CMAKE_INSTALL_COMPONENT) 27 | endif() 28 | endif() 29 | 30 | # Install shared libraries without execute permission? 31 | if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE) 32 | set(CMAKE_INSTALL_SO_NO_EXE "1") 33 | endif() 34 | 35 | # Is this installation the result of a crosscompile? 36 | if(NOT DEFINED CMAKE_CROSSCOMPILING) 37 | set(CMAKE_CROSSCOMPILING "FALSE") 38 | endif() 39 | 40 | if(NOT CMAKE_INSTALL_LOCAL_ONLY) 41 | # Include the install script for the subdirectory. 42 | include("/home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch1/cmake_install.cmake") 43 | endif() 44 | 45 | if(NOT CMAKE_INSTALL_LOCAL_ONLY) 46 | # Include the install script for the subdirectory. 47 | include("/home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch2/cmake_install.cmake") 48 | endif() 49 | 50 | if(NOT CMAKE_INSTALL_LOCAL_ONLY) 51 | # Include the install script for the subdirectory. 52 | include("/home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/cmake_install.cmake") 53 | endif() 54 | 55 | if(CMAKE_INSTALL_COMPONENT) 56 | set(CMAKE_INSTALL_MANIFEST "install_manifest_${CMAKE_INSTALL_COMPONENT}.txt") 57 | else() 58 | set(CMAKE_INSTALL_MANIFEST "install_manifest.txt") 59 | endif() 60 | 61 | string(REPLACE ";" "\n" CMAKE_INSTALL_MANIFEST_CONTENT 62 | "${CMAKE_INSTALL_MANIFEST_FILES}") 63 | file(WRITE "/home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/${CMAKE_INSTALL_MANIFEST}" 64 | "${CMAKE_INSTALL_MANIFEST_CONTENT}") 65 | -------------------------------------------------------------------------------- /ch3/3.05/lexer.l: -------------------------------------------------------------------------------- 1 | /* file: lexer.h*/ 2 | 3 | %{ 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | 10 | #include "parser.hpp" //包含由parser.y生成的头文件 11 | #include "scanner.h" //包含yyFlexLexer子类的头文件 12 | #include "location.hh" //包含位置调试信息头文件 13 | 14 | static Marker::location loc;//声明位置实例 15 | #define YY_USER_ACTION loc.columns (yyleng); /* 定义了YY_USER_ACTION，该宏在每个记号的语义动作之前被调用，来根据记号的长度设置位置的信息 */ 16 | 17 | #undef yywrap 18 | #define yywrap() 1 19 | 20 | using namespace Marker; 21 | #define yyterminate() Parser::make_END(loc); 22 | %} 23 | /* 声明使用C++版本FLEXER，c++是大小写不敏感的 */ 24 | %option c++ 25 | 26 | /* 支持调试 */ 27 | %option noyywrap debug 28 | 29 | /* 使用Scanner::yylex() */ 30 | %option yyclass="Scanner" 31 | 32 | /* 一些与编译常量使用该前缀否则为yy */ 33 | %option prefix="Marker_" 34 | 35 | /*正则式的各种简写，使程序有层次感而显得明晰 */ 36 | string \"[^\n"]+\" 37 | /**/ 38 | ws [ \t]+ 39 | alpha [A-Za-z] 40 | dig [0-9] 41 | name ({alpha}|{dig}|\$)({alpha}|{dig}|[_.\-/$])* 42 | num1 {dig}+\.?([eE][-]?{dig}+)? 43 | num2 {dig}*\.{dig}+([eE][-]?{dig}+)? 44 | number {num1}|{num2} 45 | id ({alpha})+ 46 | 47 | 48 | %% 49 | %{ 50 | // C++ 兼容的词法分析器的规则，step函数把位置的起始值设置为与结束值相等，这样位置就指向了上一个极少的结束位置。 51 | loc.step(); 52 | %} 53 | 54 | 55 | {number} { 56 | return Parser::make_NUMBER(std::strtof(yytext,(&yytext+yyleng)),loc); // strtof函数将字符串转换为浮点数 57 | } 58 | 59 | "//".* | 60 | [ \t] { 61 | /* 跳过注释和空白符号 */ 62 | // step函数把位置的起始值设置为与结束值相等，这样位置就指向了上一个极少的结束位置。 63 | // 由于注释和空白符号识别后并不会返回，而前一个step的调用是在上一次yylex返回时，所以此处需要手动更新记号的起始位置 64 | loc.step(); 65 | } 66 | 67 | \n { 68 | loc.lines(yyleng); // 使用lines函数来更新位置信息中的行号 69 | loc.step(); 70 | return Parser::make_EOL(loc); 71 | } 72 | "+" { return Parser::make_ADD(loc); } 73 | "-" { return Parser::make_SUB(loc); } 74 | "*" { return Parser::make_MUL(loc); } 75 | "/" { return Parser::make_DIV(loc); } 76 | "(" { return Parser::make_LPAREN(yytext,loc); } 77 | ")" { return Parser::make_RPAREN(yytext,loc); } 78 | "|" { return Parser::make_ABS(loc); } 79 | {id} { return Parser::make_IDENTIFIER(yytext,loc); } 80 | <> { return yyterminate(); } 81 | . { 82 | printf("Mystery character %c\n", *yytext); 83 | loc.step(); 84 | } 85 | %% 86 | //这里可以放一些C或者C++代码 -------------------------------------------------------------------------------- /cmake-build-debug/ch1/1.06/1.06_calculator_with_bison.tab.h: -------------------------------------------------------------------------------- 1 | /* A Bison parser, made by GNU Bison 3.0.4. */ 2 | 3 | /* Bison interface for Yacc-like parsers in C 4 | 5 | Copyright (C) 1984, 1989-1990, 2000-2015 Free Software Foundation, Inc. 6 | 7 | This program is free software: you can redistribute it and/or modify 8 | it under the terms of the GNU General Public License as published by 9 | the Free Software Foundation, either version 3 of the License, or 10 | (at your option) any later version. 11 | 12 | This program is distributed in the hope that it will be useful, 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 | GNU General Public License for more details. 16 | 17 | You should have received a copy of the GNU General Public License 18 | along with this program. If not, see . */ 19 | 20 | /* As a special exception, you may create a larger work that contains 21 | part or all of the Bison parser skeleton and distribute that work 22 | under terms of your choice, so long as that work isn't itself a 23 | parser generator using the skeleton or a modified version thereof 24 | as a parser skeleton. Alternatively, if you modify or redistribute 25 | the parser skeleton itself, you may (at your option) remove this 26 | special exception, which will cause the skeleton and the resulting 27 | Bison output files to be licensed under the GNU General Public 28 | License without this special exception. 29 | 30 | This special exception was added by the Free Software Foundation in 31 | version 2.2 of Bison. */ 32 | 33 | #ifndef YY_YY_1_06_CALCULATOR_WITH_BISON_TAB_H_INCLUDED 34 | # define YY_YY_1_06_CALCULATOR_WITH_BISON_TAB_H_INCLUDED 35 | /* Debug traces. */ 36 | #ifndef YYDEBUG 37 | # define YYDEBUG 0 38 | #endif 39 | #if YYDEBUG 40 | extern int yydebug; 41 | #endif 42 | 43 | /* Token type. */ 44 | #ifndef YYTOKENTYPE 45 | # define YYTOKENTYPE 46 | enum yytokentype 47 | { 48 | NUMBER = 258, 49 | ADD = 259, 50 | SUB = 260, 51 | MUL = 261, 52 | DIV = 262, 53 | ABS = 263, 54 | L_PARENTHESIS = 264, 55 | R_PARENTHESIS = 265, 56 | EOL = 266 57 | }; 58 | #endif 59 | 60 | /* Value type. */ 61 | #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED 62 | typedef int YYSTYPE; 63 | # define YYSTYPE_IS_TRIVIAL 1 64 | # define YYSTYPE_IS_DECLARED 1 65 | #endif 66 | 67 | 68 | extern YYSTYPE yylval; 69 | 70 | int yyparse (void); 71 | 72 | #endif /* !YY_YY_1_06_CALCULATOR_WITH_BISON_TAB_H_INCLUDED */ 73 | -------------------------------------------------------------------------------- /cmake-build-debug/ch3/3.02/3.02_create_AST_with_bison.tab.h: -------------------------------------------------------------------------------- 1 | /* A Bison parser, made by GNU Bison 3.0.4. */ 2 | 3 | /* Bison interface for Yacc-like parsers in C 4 | 5 | Copyright (C) 1984, 1989-1990, 2000-2015 Free Software Foundation, Inc. 6 | 7 | This program is free software: you can redistribute it and/or modify 8 | it under the terms of the GNU General Public License as published by 9 | the Free Software Foundation, either version 3 of the License, or 10 | (at your option) any later version. 11 | 12 | This program is distributed in the hope that it will be useful, 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 | GNU General Public License for more details. 16 | 17 | You should have received a copy of the GNU General Public License 18 | along with this program. If not, see . */ 19 | 20 | /* As a special exception, you may create a larger work that contains 21 | part or all of the Bison parser skeleton and distribute that work 22 | under terms of your choice, so long as that work isn't itself a 23 | parser generator using the skeleton or a modified version thereof 24 | as a parser skeleton. Alternatively, if you modify or redistribute 25 | the parser skeleton itself, you may (at your option) remove this 26 | special exception, which will cause the skeleton and the resulting 27 | Bison output files to be licensed under the GNU General Public 28 | License without this special exception. 29 | 30 | This special exception was added by the Free Software Foundation in 31 | version 2.2 of Bison. */ 32 | 33 | #ifndef YY_YY_3_02_CREATE_AST_WITH_BISON_TAB_H_INCLUDED 34 | # define YY_YY_3_02_CREATE_AST_WITH_BISON_TAB_H_INCLUDED 35 | /* Debug traces. */ 36 | #ifndef YYDEBUG 37 | # define YYDEBUG 0 38 | #endif 39 | #if YYDEBUG 40 | extern int yydebug; 41 | #endif 42 | 43 | /* Token type. */ 44 | #ifndef YYTOKENTYPE 45 | # define YYTOKENTYPE 46 | enum yytokentype 47 | { 48 | NUMBER = 258, 49 | EOL = 259 50 | }; 51 | #endif 52 | 53 | /* Value type. */ 54 | #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED 55 | 56 | union YYSTYPE 57 | { 58 | #line 10 "/home/cmp/work_dir/source_code/yacc_bison_practice/ch3/3.02/3.02_create_AST_with_bison.y" /* yacc.c:1909 */ 59 | 60 | struct ASTNode *a; 61 | double d; 62 | 63 | #line 64 "3.02_create_AST_with_bison.tab.h" /* yacc.c:1909 */ 64 | }; 65 | 66 | typedef union YYSTYPE YYSTYPE; 67 | # define YYSTYPE_IS_TRIVIAL 1 68 | # define YYSTYPE_IS_DECLARED 1 69 | #endif 70 | 71 | 72 | extern YYSTYPE yylval; 73 | 74 | int yyparse (void); 75 | 76 | #endif /* !YY_YY_3_02_CREATE_AST_WITH_BISON_TAB_H_INCLUDED */ 77 | -------------------------------------------------------------------------------- /cmake-build-debug/CMakeFiles/TargetDirectories.txt: -------------------------------------------------------------------------------- 1 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/CMakeFiles/rebuild_cache.dir 2 | /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/CMakeFiles/edit_cache.dir 3 | 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1) 28 | set(CMAKE_C_COMPILER_WORKS TRUE) 29 | set(CMAKE_C_ABI_COMPILED TRUE) 30 | set(CMAKE_COMPILER_IS_MINGW ) 31 | set(CMAKE_COMPILER_IS_CYGWIN ) 32 | if(CMAKE_COMPILER_IS_CYGWIN) 33 | set(CYGWIN 1) 34 | set(UNIX 1) 35 | endif() 36 | 37 | set(CMAKE_C_COMPILER_ENV_VAR "CC") 38 | 39 | if(CMAKE_COMPILER_IS_MINGW) 40 | set(MINGW 1) 41 | endif() 42 | set(CMAKE_C_COMPILER_ID_RUN 1) 43 | set(CMAKE_C_SOURCE_FILE_EXTENSIONS c;m) 44 | set(CMAKE_C_IGNORE_EXTENSIONS h;H;o;O;obj;OBJ;def;DEF;rc;RC) 45 | set(CMAKE_C_LINKER_PREFERENCE 10) 46 | 47 | # Save compiler ABI information. 48 | set(CMAKE_C_SIZEOF_DATA_PTR "8") 49 | set(CMAKE_C_COMPILER_ABI "ELF") 50 | set(CMAKE_C_LIBRARY_ARCHITECTURE "x86_64-linux-gnu") 51 | 52 | if(CMAKE_C_SIZEOF_DATA_PTR) 53 | set(CMAKE_SIZEOF_VOID_P "${CMAKE_C_SIZEOF_DATA_PTR}") 54 | endif() 55 | 56 | if(CMAKE_C_COMPILER_ABI) 57 | set(CMAKE_INTERNAL_PLATFORM_ABI "${CMAKE_C_COMPILER_ABI}") 58 | endif() 59 | 60 | if(CMAKE_C_LIBRARY_ARCHITECTURE) 61 | set(CMAKE_LIBRARY_ARCHITECTURE "x86_64-linux-gnu") 62 | endif() 63 | 64 | set(CMAKE_C_CL_SHOWINCLUDES_PREFIX "") 65 | if(CMAKE_C_CL_SHOWINCLUDES_PREFIX) 66 | set(CMAKE_CL_SHOWINCLUDES_PREFIX "${CMAKE_C_CL_SHOWINCLUDES_PREFIX}") 67 | endif() 68 | 69 | 70 | 71 | 72 | 73 | set(CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES "/usr/lib/gcc/x86_64-linux-gnu/7/include;/usr/local/include;/usr/lib/gcc/x86_64-linux-gnu/7/include-fixed;/usr/include/x86_64-linux-gnu;/usr/include") 74 | set(CMAKE_C_IMPLICIT_LINK_LIBRARIES "gcc;gcc_s;c;gcc;gcc_s") 75 | set(CMAKE_C_IMPLICIT_LINK_DIRECTORIES "/usr/lib/gcc/x86_64-linux-gnu/7;/usr/lib/x86_64-linux-gnu;/usr/lib;/lib/x86_64-linux-gnu;/lib") 76 | set(CMAKE_C_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES "") 77 | -------------------------------------------------------------------------------- /ch3/3.02/fb3.02.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include "fb3.02.h" 5 | 6 | int yyparse(void); 7 | 8 | /* 为操作符，创建一个子树 */ 9 | struct ASTNode *newast(int NodeType, struct ASTNode *Lft, struct ASTNode *Rht) { 10 | struct ASTNode *a = malloc(sizeof(struct ASTNode)); 11 | if (!a) { 12 | yyerror("out of memory!"); 13 | exit(0); 14 | } 15 | a->NodeType = NodeType; 16 | a->Lft = Lft; 17 | a->Rht = Rht; 18 | return a; 19 | } 20 | 21 | /* 为一个值，创建一个叶子节点 */ 22 | struct ASTNode *newnum(double d) { 23 | struct numval *a = malloc(sizeof(struct numval)); 24 | if (!a) { 25 | yyerror("out of memory!"); 26 | exit(0); 27 | } 28 | a->NodeType = NT_NUM; 29 | a->number = d; 30 | 31 | // 此处将"struct numval"的类型强制转换为"struct ASTNode"类型，是因为能够统一适配eval函数的入参类型； 32 | // 而eval函数能够正确运行得益于"struct numval"类型和"struct ASTNode"类型中nodetype字段在内存中的相对位置是一致的。 33 | // 通过nodetype字段识别到"struct numval"类型的实例时，要使用该实例需要强制转换回来才行。 34 | return (struct ASTNode *) a; 35 | } 36 | 37 | /* 递归计算各个子树的值 */ 38 | double eval(struct ASTNode *a) { 39 | double v = 0; // result of eval 40 | 41 | switch (a->NodeType) { 42 | case NT_NUM: 43 | v = ((struct numval *) a)->number; 44 | break; 45 | case NT_ADD: 46 | v = eval(a->Lft) + eval(a->Rht); 47 | break; 48 | case NT_SUB: 49 | v = eval(a->Lft) - eval(a->Rht); 50 | break; 51 | case NT_MUL: 52 | v = eval(a->Lft) * eval(a->Rht); 53 | break; 54 | case NT_DIV: 55 | v = eval(a->Lft) / eval(a->Rht); 56 | break; 57 | case NT_ABS: 58 | v = eval(a->Lft); 59 | v = v < 0 ? v * -1.0f : v; 60 | break; 61 | case NT_NEG: // 处理负数求值 62 | v = eval(a->Lft) * -1.0f; 63 | break; 64 | 65 | default: 66 | printf("internal error:bad NodeType=%c,%d\n", 67 | a->NodeType, a->NodeType); 68 | break; 69 | } 70 | return v; 71 | } 72 | 73 | /* 递归释放各个树节点 */ 74 | void treefree(struct ASTNode *a) { 75 | switch (a->NodeType) { 76 | case NT_ADD:/* 2颗子树 */ 77 | case NT_SUB: 78 | case NT_MUL: 79 | case NT_DIV: 80 | treefree(a->Lft); 81 | treefree(a->Rht); 82 | break; 83 | case NT_ABS: /* 1颗子树 */ 84 | case NT_NEG: 85 | treefree(a->Lft); 86 | break; 87 | case NT_NUM:/* 没有子树 */ 88 | free(a); 89 | a = NULL; 90 | break; 91 | default: 92 | printf("internal error:bad NodeType=%c,%d\n", 93 | a->NodeType, a->NodeType); 94 | break; 95 | } 96 | } 97 | 98 | void yyerror(char *s, ...) { 99 | va_list ap; 100 | va_start(ap, s); 101 | fprintf(stderr, "%d: error: ", yylineno); 102 | vfprintf(stderr, s, ap); 103 | fprintf(stderr, "\n"); 104 | } 105 | 106 | int main(int argc, char **argv) { 107 | printf("> "); 108 | return yyparse(); 109 | } -------------------------------------------------------------------------------- /ch3/3.05/parser.y: -------------------------------------------------------------------------------- 1 | /* file: parser.y */ 2 | 3 | /* 使用指令％skeleton "lalr1.cc"选择C++解析器的骨架 */ 4 | %skeleton "lalr1.cc" 5 | 6 | /* 指定bison的版本 */ 7 | %require "3.0.4" 8 | 9 | %define api.namespace {Marker} //声明命名空间与下面声明的类名结合使用 Marker::Parser:: 在scanner.l中有体现 10 | %define parser_class_name { Parser } 11 | %define api.token.constructor 12 | %define api.value.type variant //使得类型与token定义可以使用各种复杂的结构与类型 13 | %define parse.assert //开启断言功能 14 | %defines //生成各种头文件 location.hh position.hh parser.hpp 15 | %code requires 16 | { 17 | /*requires中的内容会放在YYLTYPE与YYSTPYPE定义前*/ 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include 23 | using namespace std; 24 | 25 | namespace Marker { /*避免包含头文件时冲突*/ 26 | class Scanner; 27 | class Driver; 28 | } 29 | } 30 | 31 | %code top 32 | { 33 | /*尽可能放在parser.cpp靠近头部的地方，与requires相似*/ 34 | #include 35 | #include "scanner.h" 36 | #include "parser.hpp" 37 | #include "driver.h" 38 | #include "location.hh" 39 | 40 | /*注意：这里的参数由%parse-param决定*/ 41 | static Marker::Parser::symbol_type yylex(Marker::Scanner& scanner,Marker::Driver &driver){ 42 | return scanner.nextToken(); 43 | } 44 | using namespace Marker; 45 | } 46 | 47 | /*定义parser传给scanner的参数*/ 48 | %lex-param { Marker::Scanner& scanner } 49 | %lex-param { Marker::Driver& driver } 50 | 51 | /*定义driver传给parser的参数*/ 52 | %parse-param { Marker::Scanner& scanner } 53 | %parse-param { Marker::Driver& driver } 54 | 55 | %locations 56 | //%define parse-trace 57 | 58 | /*详细显示错误信息*/ 59 | %define parse.error verbose 60 | 61 | /*通过Marker::Parser::make_XXX(loc)给token添加前缀*/ 62 | %define api.token.prefix {TOKEN_} 63 | 64 | %token RPAREN 65 | %token IDENTIFIER 66 | %token NUMBER 67 | 68 | %token EOL 69 | %token END 0 70 | 71 | %left ADD "+" 72 | %left SUB "-" 73 | %left MUL "*" 74 | %left DIV "/" 75 | 76 | %nonassoc ABS "|" 77 | 78 | %nonassoc NEG // 负号具有最高优先级但没有结合性 79 | 80 | %left LPAREN 81 | 82 | %type exp calclist factor term 83 | 84 | %start calclist 85 | 86 | %% 87 | calclist: %empty { /* 使用%empty显示的声明该规则是一个空规则 */ } 88 | | calclist exp EOL { cout << "=" << $2 << "\n>"; } 89 | ; 90 | 91 | exp: factor { $$ = $1; } 92 | | exp ADD factor { $$ = $1 + $3; } 93 | | exp SUB factor { $$ = $1 - $3; } 94 | ; 95 | 96 | factor: term { $$ = $1; } 97 | | factor MUL term { $$ = $1 * $3; } 98 | | factor DIV term { 99 | if($3 == 0){ 100 | error(@3, "zero divide"); 101 | YYABORT; 102 | } 103 | $$ = $1 / $3; 104 | } 105 | ; 106 | 107 | term: NUMBER { $$ = $1; } 108 | | ABS exp ABS { $$ = $2 >= 0 ? $2 : -1 * $2; } 109 | | LPAREN exp RPAREN { $$ = $2; } 110 | | SUB exp %prec NEG { $$ = -1 * $2; } 111 | ; 112 | 113 | %% 114 | /*Parser实现错误处理接口*/ 115 | void Marker::Parser::error(const Marker::location& location,const std::string& message){ 116 | std::cout<<"msg:"< 6 | #include 7 | #include "1.04_NextToken_with_Flex.h" 8 | 9 | void printToken(int token) { 10 | switch (token) { 11 | case INTEGER : { 12 | printf("INTEGER %d\n", atoi(yytext)); 13 | break; 14 | } 15 | case DECIMAL : { 16 | printf("DECIMAL %f\n", atof(yytext)); 17 | break; 18 | } 19 | case IDENTIFIER : { 20 | printf("IDENTIFIER %s\n", yytext); 21 | break; 22 | } 23 | case OPERATOR : { 24 | printf("OPERATOR %s\n", yytext); 25 | break; 26 | } 27 | case KEYWORD : { 28 | printf("KEYWORD %s\n", yytext); 29 | break; 30 | } 31 | case L_PARENTHESIS : { 32 | printf("L_PARENTHESIS %s\n", yytext); 33 | break; 34 | } 35 | case R_PARENTHESIS : { 36 | printf("R_PARENTHESIS %s\n", yytext); 37 | break; 38 | } 39 | case L_SQUARE_BRACKET : { 40 | printf("L_SQUARE_BRACKET %s\n", yytext); 41 | break; 42 | } 43 | case R_SQUARE_BRACKET : { 44 | printf("R_SQUARE_BRACKET %s\n", yytext); 45 | break; 46 | } 47 | case L_BRACE : { 48 | printf("L_BRACE %s\n", yytext); 49 | break; 50 | } 51 | case R_BRACE : { 52 | printf("R_BRACE %s\n", yytext); 53 | break; 54 | } 55 | case QUESTION_SIGN : { 56 | printf("QUESTION_SIGN %s\n", yytext); 57 | break; 58 | } 59 | case COMMA : { 60 | printf("COMMA %s\n", yytext); 61 | break; 62 | } 63 | case COLON : { 64 | printf("COLON %s\n", yytext); 65 | break; 66 | } 67 | case SEMICOLON : { 68 | printf("SEMICOLON %s\n", yytext); 69 | break; 70 | } 71 | case POUND_SIGN : { 72 | printf("POUND_SIGN %s\n", yytext); 73 | break; 74 | } 75 | case LESS_THAN : { 76 | printf("LESS_THAN %s\n", yytext); 77 | break; 78 | } 79 | case LESS_EQUAL_THAN : { 80 | printf("LESS_EQUAL_THAN %s\n", yytext); 81 | break; 82 | } 83 | case GREAT_THAN : { 84 | printf("GREAT_THAN %s\n", yytext); 85 | break; 86 | } 87 | case GREAT_EQUAL_THAN : { 88 | printf("GREAT_EQUAL_THAN %s\n", yytext); 89 | break; 90 | } 91 | case QUOTATION : { 92 | printf("QUOTATION %s\n", yytext); 93 | break; 94 | } 95 | case STRING : { 96 | printf("STRING %s\n", yytext); 97 | break; 98 | } 99 | case ANNOTATION : { 100 | printf("ANNOTATION %s\n", yytext); 101 | break; 102 | } 103 | case MULTI_LINE_ANNOTATION : { 104 | printf("MULTI_LINE_ANNOTATION %s\n", yytext); 105 | break; 106 | } 107 | 108 | default: 109 | printf("[E]>>>Unknown TokenType %d\n", token); 110 | } 111 | } 112 | 113 | int main() { 114 | int token = 0; 115 | while (token = NextToken()) { 116 | printToken(token); 117 | } 118 | return 0; 119 | } -------------------------------------------------------------------------------- /ch2/2.01_usual_lang_lex_re.l: -------------------------------------------------------------------------------- 1 | /* 2 | // 【汇总】Flex实现词法分析器时常见的用于定义匹配模式的RE 3 | */ 4 | 5 | %{ 6 | #include 7 | enum TokenType 8 | { 9 | UNDEFINE = 1000, 10 | ANNOTATION = 1001, // 注释 11 | INTEGER = 1002, // 整数，123 12 | DECIMAL = 1003, // 小数，123.554 13 | IDENTIFIER = 1004, // 变量，adfa 14 | STRING = 1005, // 字符串 15 | ARITHMETIC_OPT = 1006, // 四则运算符 16 | BITWISE_OPT = 1007, // 位运算符 17 | MOD = 1008, // 取模运符 % 18 | POW = 1009, // 乘方运符 ** 19 | 20 | BOOL_OPT = 1010, // 布尔运符 && || ! 21 | 22 | MULTI_LINE_ANNOTATION = 1011, // 多行注释 /**/ 23 | }; 24 | %} 25 | 26 | %% 27 | [*/+-] { printf("ARITHMETIC_OPT\n"); return ARITHMETIC_OPT;} // 四则运算符 +-*/ 28 | "%" { printf("MOD\n"); return MOD;} // 取模运符 % 29 | "**" { printf("POW\n"); return POW;} // 乘方运符 ** 30 | 31 | 32 | [~|&^] { printf("BITWISE_OPT\n"); return BITWISE_OPT;} // 位运算符 ~|&^ 33 | ">>" { printf("BITWISE_OPT\n"); return BITWISE_OPT;} // 位运算符 >> 34 | "<<" { printf("BITWISE_OPT\n"); return BITWISE_OPT;} // 位运算符 << 35 | 36 | 37 | "&&" { printf("BOOL_OPT\n"); return BOOL_OPT;} // 布尔运符 && 38 | "||" { printf("BOOL_OPT\n"); return BOOL_OPT;} // 布尔运符 || 39 | "!" { printf("BOOL_OPT\n"); return BOOL_OPT;} // 布尔运符 ! 40 | 41 | 42 | [0-9]+ { printf("INTEGER\n"); return INTEGER; } // 识别整数 43 | [a-zA-Z_][a-zA-Z0-9_]* { printf("IDENTIFIER\n"); return IDENTIFIER; } // 识别标识符 44 | (([0-9]*\.?[0-9]+)|([0-9]+\.[0-9]*))(E[+-]?[0-9]+)? { printf("DECIMAL\n"); return DECIMAL; } // 识别小数，支持小数的科学计数法识别 45 | \"[^"]*\" { printf("STRING\n"); return STRING; } // 识别字符串 46 | 47 | 48 | "//"[^\n]*\n { printf("ANNOTATION\n"); return ANNOTATION; } // 识别单行注释 49 | "/*"([^*]|\*+[^/*])*"*/" { printf("MULTI_LINE_ANNOTATION\n"); return MULTI_LINE_ANNOTATION; } // 识别多行注释 50 | 51 | 52 | \n { printf("NEWLINE\n"); return UNDEFINE; } // 识别换行符号 53 | [ \t] { } // 忽略空格 54 | . { printf("Mystery character %s\n", yytext); } // 忽略未定义字符串 55 | %% 56 | 57 | /* 58 | // 细心的朋友已经发现，对于整数字符串（如："123"），能够同时匹配以上的第1个规则和第3个规则。 59 | // 下面一起来认识以下Flex是如何处理"相同的输入可能被多种不同的模式匹配"这种情况的： 60 | // 1. Flex将匹配尽可能多的的字符串 61 | // 2. 如果根据1处理后，仍然存在多个模式的话，Flex将选择更早定义的模式来匹配 62 | // 63 | */ 64 | 65 | 66 | //注意： 67 | // 对于识别多行注释： 68 | // "/*"([^*]|\*+[^/*])*"*/" { return MULTI_LINE_ANNOTATION; } // 识别多行注释 69 | // 是不对的，虽然能够满足大多的场景。 但有可能注释会很长，而flex的记号有一定的输入缓冲的长度限制，通常是16K。 70 | // 为了能够满足对注释的正确识别，应该使用起始条件（start condition）方法。 71 | -------------------------------------------------------------------------------- /ch2/2.06_include_file_and_start_state.l: -------------------------------------------------------------------------------- 1 | /* 2 | // file: 2.06_include_file_and_start_state.y 3 | // 使用Flex处理嵌套的包含文件（include files）与起始条件 4 | // 这个程序将处理嵌套包含文件，同时打印出这些文件中每一行的行号。 5 | // 这个程序需要维护一个包含嵌套输入文件和行号的堆栈，在每次遇到一个`#include `时压栈当前文件和行号等信息，在处理完包含文件后再把它们从堆栈弹出。 6 | // 此外本程序将使用flex一个很强大的特性——起始条件（start condition），它允许我们指定一个特定时刻哪些模式可以被用来匹配。 7 | // */ 8 | 9 | 10 | /* 不使用-lfl定义的默认main函数，使用自定义的main函数，你就不需要链接-lfl了。 */ 11 | %option noyywrap 12 | 13 | /* 把`IFILE`定义为起始条件，它将在我们寻找`#include`语句中的文件名时被使用。 */ 14 | %x IFILE 15 | 16 | %{ 17 | struct buffstack { 18 | struct buffstack *prev; /* 上一个文件信息 */ 19 | YY_BUFFER_STATE bufferstate; /* 保存的缓冲区 */ 20 | int lineno; /* 保存的行号 */ 21 | char *filename; /* 文件名 */ 22 | FILE *f; /* 当前文件 */ 23 | } *curbstk = 0; 24 | 25 | char *curfilename; /* 当前输入文件的名字 */ 26 | int newfile(char *fn); 27 | int popfile(void); 28 | %} 29 | 30 | %% 31 | ^"#"[ \t]*include[ \t]*[\"<] { // 匹配#include语句，直到双引号或者< 32 | BEGIN(IFILE); // 宏`BEGIN`用来切换到另外一个起始条件。 33 | } 34 | 35 | [^ \t\n\">]+ { // 匹配文件名，直到结束双引号、>或者换行符。 当模式紧随在<起始条件名字>之后()，表示这个模式只在该起始条件激活时才进行匹配。 36 | { // 当文件名匹配到这个模式时，#include的语句还有剩下的部分没有处理。使用下面简单的循环读完它并忽略它 37 | int c; 38 | while((c=input()) && c != '\n'); 39 | } 40 | yylineno++; 41 | if(!newfile(yytext)){ 42 | yyterminate(); // Error: no such file, or other failure. 43 | } 44 | printf("[INFO]开始读取include文件:%10s作为输入.\n", curbstk->filename); 45 | BEGIN(INITIAL); // flex本身会定义的`INITIAL`起始条件 46 | } 47 | 48 | .|\n { // 处理IFILE起始条件中错误输入的情况 49 | fprintf(stderr, "行号：%8d 错误的include语法\n", yylineno); 50 | yyterminate(); 51 | } 52 | 53 | <> { // <>是Flex定义的特殊模式，它匹配输入文件的结束。 54 | printf("[INFO]结束读取include文件:%10s.\n", curbstk->filename); 55 | if(!popfile()){ // 当文件结束时弹出文件堆栈，如果是最外层文件就结束 56 | yyterminate(); 57 | } 58 | } 59 | 60 | ^. { // 在每一行开始时，打印行号 61 | fprintf(yyout, "%8d %s", yylineno, yytext); // yylineno是Flex提供的记录行号的变量 62 | } 63 | 64 | ^\n { // 每遇到一个\n，需要把行号+1 65 | fprintf(yyout, "%8d %s", yylineno++, yytext); 66 | } 67 | 68 | \n { 69 | ECHO; 70 | yylineno++; 71 | } 72 | 73 | . { // 这是Flex定义的默认的规则，其中ECHO是Flex定义的默认输出宏，它会将字符原样输出到yyout。关于ECHO详见2.05，https://blog.csdn.net/weixin_46222091/article/details/105968391 74 | ECHO; 75 | } 76 | %% 77 | int main(int argc, char ** argv){ 78 | if(argc < 2){ 79 | fprintf(stderr, "need filename\n"); 80 | return 1; 81 | } 82 | if(newfile(argv[1])) yylex(); 83 | } 84 | 85 | int newfile(char *fn){ 86 | FILE *f = fopen(fn, "r"); 87 | struct buffstack *bstk = malloc(sizeof(struct buffstack)); 88 | 89 | /* 如果文件打开失败时，退出 */ 90 | if(!f) { 91 | 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the terms of the GNU General Public License as published by 9 | // the Free Software Foundation, either version 3 of the License, or 10 | // (at your option) any later version. 11 | 12 | // This program is distributed in the hope that it will be useful, 13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 | // GNU General Public License for more details. 16 | 17 | // You should have received a copy of the GNU General Public License 18 | // along with this program. If not, see . 19 | 20 | // As a special exception, you may create a larger work that contains 21 | // part or all of the Bison parser skeleton and distribute that work 22 | // under terms of your choice, so long as that work isn't itself a 23 | // parser generator using the skeleton or a modified version thereof 24 | // as a parser skeleton. Alternatively, if you modify or redistribute 25 | // the parser skeleton itself, you may (at your option) remove this 26 | // special exception, which will cause the skeleton and the resulting 27 | // Bison output files to be licensed under the GNU General Public 28 | // License without this special exception. 29 | 30 | // This special exception was added by the Free Software Foundation in 31 | // version 2.2 of Bison. 32 | 33 | /** 34 | ** \file /home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/stack.hh 35 | ** Define the Marker::stack class. 36 | */ 37 | 38 | #ifndef YY_YY_HOME_CMP_WORK_DIR_SOURCE_CODE_YACC_BISON_PRACTICE_CMAKE_BUILD_DEBUG_CH3_3_05_STACK_HH_INCLUDED 39 | # define YY_YY_HOME_CMP_WORK_DIR_SOURCE_CODE_YACC_BISON_PRACTICE_CMAKE_BUILD_DEBUG_CH3_3_05_STACK_HH_INCLUDED 40 | 41 | # include 42 | 43 | #line 9 "/home/cmp/work_dir/source_code/yacc_bison_practice/ch3/3.05/parser.y" // stack.hh:132 44 | namespace Marker { 45 | #line 46 "/home/cmp/work_dir/source_code/yacc_bison_practice/cmake-build-debug/ch3/3.05/stack.hh" // stack.hh:132 46 | template > 47 | class stack 48 | { 49 | public: 50 | // Hide our reversed order. 51 | typedef typename S::reverse_iterator iterator; 52 | typedef typename S::const_reverse_iterator const_iterator; 53 | 54 | stack () 55 | : seq_ () 56 | { 57 | seq_.reserve (200); 58 | } 59 | 60 | stack (unsigned int n) 61 | : seq_ (n) 62 | {} 63 | 64 | inline 65 | T& 66 | operator[] (unsigned int i) 67 | { 68 | return seq_[seq_.size () - 1 - i]; 69 | } 70 | 71 | inline 72 | const T& 73 | operator[] (unsigned int i) const 74 | { 75 | return seq_[seq_.size () - 1 - i]; 76 | } 77 | 78 | /// Steal the contents of \a t. 79 | /// 80 | /// Close to move-semantics. 81 | inline 82 | void 83 | push (T& t) 84 | { 85 | seq_.push_back (T()); 86 | operator[](0).move (t); 87 | } 88 | 89 | inline 90 | void 91 | pop (unsigned int n = 1) 92 | { 93 | for (; n; --n) 94 | seq_.pop_back (); 95 | } 96 | 97 | void 98 | clear () 99 | { 100 | seq_.clear (); 101 | } 102 | 103 | inline 104 | typename S::size_type 105 | size () const 106 | { 107 | return seq_.size (); 108 | } 109 | 110 | inline 111 | const_iterator 112 | begin () const 113 | { 114 | return seq_.rbegin (); 115 | } 116 | 117 | inline 118 | const_iterator 119 | end () const 120 | { 121 | return seq_.rend (); 122 | } 123 | 124 | private: 125 | stack (const stack&); 126 | stack& operator= (const stack&); 127 | /// The wrapped container. 128 | S seq_; 129 | }; 130 | 131 | /// Present a slice of the top of a stack. 132 | template > 133 | class slice 134 | { 135 | public: 136 | slice (const S& stack, unsigned int range) 137 | : stack_ (stack) 138 | , range_ (range) 139 | {} 140 | 141 | inline 142 | const T& 143 | operator [] (unsigned int i) const 144 | { 145 | return stack_[range_ - i]; 146 | } 147 | 148 | private: 149 | const S& stack_; 150 | unsigned int range_; 151 | }; 152 | 153 | #line 9 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enum TokenType 11 | { 12 | INTEGER = 1001, // 整数，123 13 | DECIMAL = 1002, // 小数，123.554 14 | IDENTIFIER = 1003, // 变量，adfa 15 | OPERATOR = 1004, // 操作符，+/* 16 | KEYWORD = 1005, // 关键字，if/for 17 | L_PARENTHESIS = 1006, // 左圆括号，( 18 | R_PARENTHESIS = 1007, // 右圆括号，) 19 | L_SQUARE_BRACKET = 1008, // 左方括号，[ 20 | R_SQUARE_BRACKET = 1009, // 右方括号，] 21 | L_BRACE = 1010, // 左大括号，{ 22 | R_BRACE = 1011, // 右大括号，} 23 | QUESTION_SIGN = 1012, // 问号，? 24 | COMMA = 1013, // 逗号，, 25 | COLON = 1014, // 冒号，: 26 | SEMICOLON = 1015, // 分号，; 27 | POUND_SIGN = 1016, // 井号，# 28 | LESS_THAN = 1017, // 小于，< 29 | LESS_EQUAL_THAN = 1018, // 小于等于，<= 30 | GREAT_THAN = 1019, // 大于，> 31 | GREAT_EQUAL_THAN = 1020, // 大于等于，>= 32 | 33 | QUOTATION = 1021, // 单引号，' 34 | 35 | STRING = 1022, // 字符串， 36 | ANNOTATION = 1023, // 单行注释，" 37 | MULTI_LINE_ANNOTATION = 1024, // 多行注释，" 38 | 39 | }; 40 | int yylval = 0; 41 | %} 42 | 43 | %% 44 | [*/+-] { return OPERATOR;} // 四则运算符 +-*/ 45 | "%" { return OPERATOR;} // 取模运符 % 46 | "**" { return OPERATOR;} // 乘方运符 ** 47 | [~|&^] { return OPERATOR;} // 位运算符 ~|&^ 48 | ">>" { return OPERATOR;} // 位运算符 >> 49 | "<<" { return OPERATOR;} // 位运算符 << 50 | "&&" { return OPERATOR;} // 布尔运符 && 51 | "||" { return OPERATOR;} // 布尔运符 || 52 | "!" { return OPERATOR;} // 布尔运符 ! 53 | "->" { return OPERATOR;} // 成员运算符号 54 | 55 | "[" { return L_SQUARE_BRACKET; } 56 | "]" { return R_SQUARE_BRACKET; } 57 | 58 | "(" { return L_PARENTHESIS; } 59 | ")" { return R_PARENTHESIS; } 60 | 61 | "{" { return L_BRACE; } 62 | "}" { return R_BRACE; } 63 | 64 | "<" { return LESS_THAN; } 65 | "<=" { return LESS_EQUAL_THAN; } 66 | ">" { return GREAT_THAN; } 67 | ">=" { return GREAT_EQUAL_THAN; } 68 | 69 | "?" { return QUESTION_SIGN; } 70 | "," { return COMMA; } 71 | ":" { return COLON; } 72 | ";" { return SEMICOLON; } 73 | "#" { return POUND_SIGN; } 74 | "'" { return QUOTATION; } 75 | 76 | 77 | "auto" { return KEYWORD; } 78 | "break" { return KEYWORD; } 79 | "case" { return KEYWORD; } 80 | "char" { return KEYWORD; } 81 | "const" { return KEYWORD; } 82 | "continue" { return KEYWORD; } 83 | "default" { return KEYWORD; } 84 | "do" { return KEYWORD; } 85 | "double" { return KEYWORD; } 86 | "else" { return KEYWORD; } 87 | "enum" { return KEYWORD; } 88 | "extern" { return KEYWORD; } 89 | "float" { return KEYWORD; } 90 | "for" { return KEYWORD; } 91 | "goto" { return KEYWORD; } 92 | "if" { return KEYWORD; } 93 | "int" { return KEYWORD; } 94 | "long" { return KEYWORD; } 95 | "register" { return KEYWORD; } 96 | "return" { return KEYWORD; } 97 | "short" { return KEYWORD; } 98 | "signed" { return KEYWORD; } 99 | "sizeof" { return KEYWORD; } 100 | "static" { return KEYWORD; } 101 | "struct" { return KEYWORD; } 102 | "switch" { return KEYWORD; } 103 | "typedef" { return KEYWORD; } 104 | "union" { return KEYWORD; } 105 | "unsigned" { return KEYWORD; } 106 | "void" { return KEYWORD; } 107 | "volatile" { return KEYWORD; } 108 | "while" { return KEYWORD; } 109 | 110 | 111 | [0-9]+ { return INTEGER; } // 识别整数。为什么不用"[-+]?[0-9]+"这样的规则去识别一个整数，是因为"-"是一个语义相关的。例如："-2"在表达式"1-2"中应该识别为减号和整数，而在"1--2"中"-2"应该识别为一个负整数 112 | [a-zA-Z_][a-zA-Z0-9_]* { return IDENTIFIER; } // 识别标识符 113 | (([0-9]*\.?[0-9]+)|([0-9]+\.[0-9]*))(E[+-]?[0-9]+)? { return DECIMAL; } // 识别小数，支持小数的科学计数法识别。为什么不用"[-+]?(([0-9]*\.?[0-9]+)|([0-9]+\.[0-9]*))(E[+-]?[0-9]+)?"这样的规则去识别一个整数，是因为"-"是一个语义相关的。 114 | 115 | \"[^"]*\" { return STRING; } // 识别字符串 116 | 117 | "//"[^\n]*\n { return ANNOTATION; } // 识别单行注释 118 | "/*"([^*]|\*+[^/*])*"*/" { return MULTI_LINE_ANNOTATION; } // 识别多行注释 119 | 120 | [ \t] { /*忽略空白字符*/ } 121 | %% 122 | 123 | int NextToken() 124 | { 125 | /* 126 | 每当调用yylex()时，它都会从全局输入文件yyin（默认为stdin）中扫描token。 127 | 它一直持续到到达文件结尾（此时它返回值0）或它的其中一个动作执行return语句为止。 128 | */ 129 | return yylex(); 130 | }; 131 | 132 | 133 | 134 | //注意： 135 | // 对于识别多行注释： 136 | // "/*"([^*]|\*+[^/*])*"*/" { return MULTI_LINE_ANNOTATION; } // 识别多行注释 137 | // 是不对的，虽然能够满足大多的场景。 但有可能注释会很长，而flex的记号有一定的输入缓冲的长度限制，通常是16K。 138 | // 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