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This document describes the changes made to the Parsetools application.

Parsetools 2.0.3
Fixed Bugs and Malfunctions

Yecc failed to report reduce/reduce conflicts where one of the reductions involved the root symbol. This bug has been fixed. (Thanks to Manolis Papadakis.)

Own Id: OTP-8483

A bug introduced in Parsetools 1.4.4 (R12B-2) has been fixed. (Thanks to Manolis Papadakis.)

Own Id: OTP-8486
Parsetools 2.0.2
Improvements and New Features

Cleanups suggested by tidier and modernization of types and specs.

Own Id: OTP-8455
Parsetools 2.0.1
Improvements and New Features

Leex no longer uses the deprecated regexp module. (Thanks to Robert Virding.).

Own Id: OTP-8231
Fixed Bugs and Malfunctions

A minor bug in leex(3) has been fixed.

Own Id: OTP-8197
Parsetools 2.0
Improvements and New Features

Leex, a lexical analyzer generator for Erlang, has been added to Parsetools. This initial version should be considered experimental; it is known that there will be changes and additions. (Thanks to Robert Virding.).

Own Id: OTP-8013
Fixed Bugs and Malfunctions

The parsers generated by Yecc now report correct error lines when possible.

Own Id: OTP-7969
Parsetools 1.4.7
Fixed Bugs and Malfunctions

A bug in yeccpre.hrl introduced in R13A has been fixed.

Own Id: OTP-7945
Parsetools 1.4.6
Improvements and New Features

Updated file headers.

Own Id: OTP-7798
Parsetools 1.4.5
Improvements and New Features

The yecc grammar has been augmented with an optional header section. (Thanks to Richard Carlsson.)

Own Id: OTP-7292
Parsetools 1.4.4
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
Parsetools 1.4.3
Improvements and New Features

tuple_size/1 and byte_size/1 have been substituted for size/1.

Own Id: OTP-7009
Parsetools 1.4.2
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
Parsetools 1.4.1.1
Improvements and New Features

Minor Makefile changes.

Own Id: OTP-6689
Parsetools 1.4.1
Fixed Bugs and Malfunctions

A bug concerning precedence declarations of non-terminals "one level up" has been fixed in yecc.

Own Id: OTP-6362
Parsetools 1.4
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

Parsetools 1.3.2
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
Parsetools 1.3.1
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