## 1 Parsetools Release Notes

This document describes the changes made to the Parsetools application.

### 1.1 Parsetools 1.4.5

#### 1.1.1 Improvements and New Features

- The yecc grammar has been augmented with an optional header section. (Thanks to Richard Carlsson.)
  Own Id: OTP-7292

### 1.2 Parsetools 1.4.4

#### 1.2.1 Improvements and New Features

- The size of the code generated by Yecc has been reduced. The code is also faster.
  Macros can now be used in actions.
  Own Id: OTP-7224

### 1.3 Parsetools 1.4.3

#### 1.3.1 Improvements and New Features

- tuple_size/1 and byte_size/1 have been substituted for size/1.
  Own Id: OTP-7009

### 1.4 Parsetools 1.4.2

#### 1.4.1 Improvements and New Features

- The size of the code generated by yecc has been reduced.
  A note regarding the includefile option: although yecc can cope with includefiles based on some earlier yeccpre.hrl it is recommended for efficiency reasons to update includefiles as to follow the pattern in the latest yeccpre.hrl.
  Own Id: OTP-6851

### 1.5 Parsetools 1.4.1.1

#### 1.5.1 Improvements and New Features

- Minor Makefile changes.
  Own Id: OTP-6689

### 1.6 Parsetools 1.4.1

#### 1.6.1 Fixed Bugs and Malfunctions

- A bug concerning precedence declarations of non-terminals "one level up" has been fixed in yecc.
  Own Id: OTP-6362

### 1.7 Parsetools 1.4

#### 1.7.1 Improvements and Fixed Bugs

Several modifications of Yecc have been made:

- The new functions file/1,2 take the role of the old functions yecc/2,3,4. The latter functions are no longer documented but are kept for backward compatibility.
- More checks of the grammar file have been implemented. Examples are warnings for unused non-terminals and duplicated declarations.
- Invalid pseudo variables are no longer replaced by '$undefined' but cause a failure.
- Reserved words no longer need to be quoted when used as terminals or non-terminals.
- When compiling the generated parser file errors and warnings concerning user code refer to the grammar file, not the parser file.
- Yecc emits a warning if there are conflicts in the grammar. The new declaration Expect can be used to suppress this warning.
- The new operator precedence declaration Nonassoc can be used to declare operators with no associativity.
- Precedence can be given to more than one operator with one single operator precedence declaration.
- The function parse_and_scan/1 in the default includefile accepts {Function, A} as well as {{M,F}, A} as tokenizer function. Exceptions in the tokenizer are never caught.
- The functions yecc:file/1,2 can be accessed from the Erlang shell via the new functions c:y/1,2 in STDLIB.

See yecc(3) for further details.

Own Id: OTP-5366

### 1.8 Parsetools 1.3.2

#### 1.8.1 Fixed Bugs and Malfunctions

- A bug in Yecc that was introduced in R9B has been removed. Another bug concerning precedence declaration "one level up" has been fixed.
  Own Id: OTP-5461

### 1.9 Parsetools 1.3.1

#### 1.9.1 Fixed Bugs and Malfunctions

- A bug in the file parsetools/include/yeccpre.hrl caused yecc:parse_and_scan/1 to always report a parse failure when the lexer reported end-of-file. This problem has been fixed.
  Own Id: OTP-5369

parsetools 1.4.5
Copyright © 1991-2008 Ericsson AB