90 lines
2.2 KiB
Plaintext
90 lines
2.2 KiB
Plaintext
ANTLR v4
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Terence Parr, parrt at cs usfca edu
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ANTLR project lead and supreme dictator for life
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University of San Francisco
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INTRODUCTION
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Hi and welcome to the Honey Badger 4.0b2 release of ANTLR!
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INSTALLATION
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$ cd /usr/local/lib
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$ curl -O --silent http://www.antlr.org/download/antlr-4.0b2-complete.jar
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Or just download from http://www.antlr.org/download/antlr-4.0b2-complete.jar
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and put it somewhere rational for your operating system.
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You can either add to your CLASSPATH:
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$ export CLASSPATH=".:/usr/local/lib/antlr-4.0b2-complete.jar:$CLASSPATH"
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and launch org.antlr.v4.Tool directly:
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$ java org.antlr.v4.Tool
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ANTLR Parser Generator Version 4.0b2
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-o ___ specify output directory where all output is generated
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-lib ___ specify location of .tokens files
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...
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or use -jar option on java:
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$ java -jar /usr/local/lib/antlr-4.0b2-complete.jar
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ANTLR Parser Generator Version 4.0b2
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-o ___ specify output directory where all output is generated
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-lib ___ specify location of .tokens files
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...
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You can make a script, /usr/local/bin/antlr4:
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#!/bin/sh
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java -cp "/usr/local/lib/antlr4-complete.jar:$CLASSPATH" org.antlr.v4.Tool $*
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On Windows, you can do something like this (assuming you put the
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jar in C:\libraries) for antlr4.bat:
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java -cp C:\libraries\antlr-4.0b2-complete.jar;%CLASSPATH% org.antlr.v4.Tool %*
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You can also use an alias
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$ alias antlr4='java -jar /usr/local/lib/antlr-4.0b2-complete.jar'
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Either way, say just antlr4 to run ANTLR now.
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The TestRig class is very useful for testing your grammars:
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$ alias grun='java org.antlr.v4.runtime.misc.TestRig'
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EXAMPLE
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In /tmp/Hello.g4, paste this:
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// Define a grammar called Hello
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// match keyword hello followed by an identifier
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// match lower-case identifiers
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grammar Hello;
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r : 'hello' ID ;
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ID : [a-z]+ ;
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WS : [ \t\n]+ -> skip ; // skip spaces, tabs, newlines
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Then run ANTLR the tool on it:
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$ cd /tmp
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$ antlr4 Hello.g4
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$ javac Hello*.java
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Now test it:
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$ grun Hello r -tree
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hello parrt
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^D
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(r hello parrt)
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(That ^D means EOF on unix; it's ^Z in Windows.) The -tree option prints
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the parse tree in LISP notation.
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BOOK SOURCE CODE
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http://pragprog.com/titles/tpantlr2/source_code
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