(1). JavaCC介绍
在看Calcite时,有看到使用了JavaCC,所以,得先放下手里的Caclite,那么,什么是JavaCC呢? JavaCC是一个能生成词法和语法的分析器的生成程序.
词法分析器,就是对一串文本进行拆分,转换成一系列的Token.
语法分析器,就是对词法分析器产生的Token,进行校验.
给我感觉:MyBatis的动态SQL有这个功能来着的.
(2). JavaCC安装
lixin-macbook:~ lixin$ wget https://github.com/javacc/javacc/archive/javacc-7.0.9.tar.gz
lixin-macbook:~ lixin$ tar -zxvf javacc-7.0.9.tar.gz
lixin-macbook:~ lixin$ mv javacc-javacc-7.0.9 javacc-7.0.9
lixin-macbook:~ lixin$ mv javacc-7.0.9 ~/Developer/
lixin-macbook:~ lixin$ cd ~/Developer/javacc-7.0.9/
lixin-macbook:javacc-7.0.9 lixin$ ant
lixin-macbook:javacc-7.0.9 lixin$ chmod 755 ./scripts/javacc
(3). 设置环境变量
lixin-macbook:~ lixin$ vi ~/.bash_profile
JAVACC_HOME=/Users/lixin/Developer/javacc-7.0.9
PATH=$PATH:$JAVACC_HOME/scripts:
(4). 环境变量生效
lixin-macbook:~ lixin$ source ~/.bash_profile
(5). 运行javacc
lixin-macbook:~ lixin$ javacc
Java Compiler Compiler Version 7.0.9 (Parser Generator)
Usage:
javacc option-settings inputfile
"option-settings" is a sequence of settings separated by spaces.
Each option setting must be of one of the following forms:
-optionname=value (e.g., -STATIC=false)
-optionname:value (e.g., -STATIC:false)
-optionname (equivalent to -optionname=true. e.g., -STATIC)
-NOoptionname (equivalent to -optionname=false. e.g., -NOSTATIC)
Option settings are not case-sensitive, so one can say "-nOsTaTiC" instead
of "-NOSTATIC". Option values must be appropriate for the corresponding
option, and must be either an integer, a boolean, or a string value.
The integer valued options are:
CHOICE_AMBIGUITY_CHECK (default : 2)
DEPTH_LIMIT (default : 0)
LOOKAHEAD (default : 1)
OTHER_AMBIGUITY_CHECK (default : 1)
The boolean valued options are:
BUILD_PARSER (default : true)
BUILD_TOKEN_MANAGER (default : true)
CACHE_TOKENS (default : false)
COMMON_TOKEN_ACTION (default : false)
DEBUG_LOOKAHEAD (default : false)
DEBUG_PARSER (default : false)
DEBUG_TOKEN_MANAGER (default : false)
ERROR_REPORTING (default : true)
FORCE_LA_CHECK (default : false)
GENERATE_ANNOTATIONS (default : false)
GENERATE_BOILERPLATE (default : true)
GENERATE_CHAINED_EXCEPTION (default : false)
GENERATE_GENERICS (default : false)
GENERATE_STRING_BUILDER (default : false)
IGNORE_ACTIONS (default : false)
IGNORE_CASE (default : false)
JAVA_UNICODE_ESCAPE (default : false)
KEEP_LINE_COLUMN (default : true)
NO_DFA (default : false)
SANITY_CHECK (default : true)
STATIC (default : true)
STOP_ON_FIRST_ERROR (default : false)
SUPPORT_CLASS_VISIBILITY_PUBLIC (default : true)
TOKEN_MANAGER_USES_PARSER (default : false)
UNICODE_INPUT (default : false)
USER_CHAR_STREAM (default : false)
USER_TOKEN_MANAGER (default : false)
The string valued options are:
GRAMMAR_ENCODING (default : <<empty>>)
JAVA_TEMPLATE_TYPE (default : classic)
JDK_VERSION (default : 1.5)
NAMESPACE (default : <<empty>>)
OUTPUT_DIRECTORY (default : .)
OUTPUT_LANGUAGE (default : java)
PARSER_CODE_GENERATOR (default : <<empty>>)
PARSER_INCLUDE (default : <<empty>>)
PARSER_SUPER_CLASS
STACK_LIMIT (default : <<empty>>)
TOKEN_EXTENDS (default : <<empty>>)
TOKEN_FACTORY (default : <<empty>>)
TOKEN_INCLUDE (default : <<empty>>)
TOKEN_MANAGER_CODE_GENERATOR (default : <<empty>>)
TOKEN_MANAGER_INCLUDE (default : <<empty>>)
TOKEN_MANAGER_SUPER_CLASS
TOKEN_SUPER_CLASS
EXAMPLE:
javacc -STATIC=false -LOOKAHEAD:2 -debug_parser mygrammar.jj
(6). 总结
能显示上面的内容,代表javacc安装成功.
