1. ANTLR 3的if~else~歧义警告问题
ANTLR - Introduction
(ANother Tool for Language Recognition)
VB HC4 http://fmt.cs.utwente.nl/courses/vertalerbouw/
http://fmt.cs.utwente.nl/courses/vertalerbouw/sheets/vb-04-antlr-1-4up.pdf
（这个ppt对ANTLR的原理和技巧总结得很好，很值得一看）
另外，官方教程称，此警告其实可以无视掉（不需要消除），原文见
http://www.antlr.org/wiki/display/ANTLR3/Pie
To build this interpreter, run ANTLR on Pie.g and then compile all of the Java files in the directory:
$ java org.antlr.Tool Pie.g
warning(200): Pie.g:51:39: Decision can match input such as "'else'"
using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
$ javac *.java
$
You can ignore the warning message from ANTLR; it's the standard if-then-else ambiguity. (See Subsection Nondeterministic Decisions of Section 11.5 in The Definitive ANTLR Reference for more details.)
$ java org.antlr.Tool Pie.g
warning(200): Pie.g:51:39: Decision can match input such as "'else'"
using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
$ javac *.java
$
You can ignore the warning message from ANTLR; it's the standard if-then-else ambiguity. (See Subsection Nondeterministic Decisions of Section 11.5 in The Definitive ANTLR Reference for more details.)
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