NAME¶
grammar::me::util - AST utilities
SYNOPSIS¶
package require
Tcl 8.4
package require
grammar::me::util ?0.1?
::grammar::me::util::ast2tree ast tree ?
root?
::grammar::me::util::ast2etree ast mcmd tree
?
root?
mcmd lc location
mcmd tok from ?
to?
::grammar::me::util::tree2ast tree ?
root?
DESCRIPTION¶
This package provides a number of utility command for the conversion between the
various representations of abstract syntax trees as specified in the document
grammar::me_ast.
- ::grammar::me::util::ast2tree ast tree
?root?
- This command converts an ast from value to object representation.
All nodes in the ast will be converted into nodes of this
tree, with the root of the AST a child of the node root. If
this node is not explicitly specified the root of the tree is used.
Existing content of tree is not touched, i.e. neither removed nor changed,
with the exception of the specified root node, which will gain a new
child.
- ::grammar::me::util::ast2etree ast mcmd tree
?root?
- This command is like ::grammar::me::util::ast2tree, except that the
result is in the extended object representation of the input AST. The
source of the extended information is the command prefix mcmd. It
has to understand two methods, lc, and tok, with the
semantics specified below.
- mcmd lc location
- Takes the location of a token given as offset in the input stream and
return a 2-element list containing the associated line number and column
index, in this order.
- mcmd tok from ?to?
- Takes one or two locations from and to as offset in the
input stream and returns a Tcl list containing the specified part of the
input stream. Both location are inclusive. If to is not specified
it will default to the value of from.
Each element of the returned list is a list containing the token, its
associated lexeme, the line number, and column index, in this order.
Both the ensemble command
::grammar::me::tcl provided by the package
grammar::me::tcl and the objects command created by the package
::grammar::me::cpu fit the above specification.
- ::grammar::me::util::tree2ast tree ?root?
- This command converts an ast in (extended) object representation
into a value and returns it. If a root node is specified the AST is
generated from that node downward. Otherwise the root of the tree object
is used as the starting point.
BUGS, IDEAS, FEEDBACK¶
This document, and the package it describes, will undoubtedly contain bugs and
other problems. Please report such in the category
grammar_me of the
Tcllib Trackers [
http://core.tcl.tk/tcllib/reportlist]. Please also
report any ideas for enhancements you may have for either package and/or
documentation.
KEYWORDS¶
abstract syntax tree, syntax tree, tree
CATEGORY¶
Grammars and finite automata
COPYRIGHT¶
Copyright (c) 2005 Andreas Kupries <andreas_kupries@users.sourceforge.net>