Intel XENIX 286 Programmers Guide (86) - Tenox.tc

XENIX Programming
CONTENTS
Starting a Loop at a Terminal
Using Braces with Arguments
Substituting Commands
Special Characters
CHAPTER 9
lex: LEXICAL ANALYZER GENERATOR
lex Source Format
lex Regular Expressions
Invoking lex
Specifying Character Classes
Specifying an Arbitrary Character
Specifying Optional Expressions
Specifying Repeated Expressions
Specifying Alternation and Grouping
Specifying Context Sensitivity
Specifying Expression Repetition
Specifying Definitions
Specifying Actions
Handling Ambiguous Source Rules
Specifying Left Context Sensitivity
Specifying Source Definitions
lex and yacc
Specifying Character Sets
Source Format
CHAPTER 10
yacc: COMPILER-COMPILER
Specifications
Actions
Lexical Analysis
How the Parser Works
Ambiguity and Conflicts
Precedence
Error Handling
The yacc Environment
Preparing Specifications
Input Style
Left Recursion
Lexical Tie-ins
Handling Reserved Words
Simulating Error and Accept in Actions
Accessing Values in Enclosing Rules
Supporting Arbitrary Value Types
A Small Desk Calculator
yacc Input Syntax
An Advanced Example
Old Features
Table of Contents
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8-19
8-20
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8-21
9-2
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