State Transition Table for Graph::Easy::Marpa V 1.02

This is the STT for the dialect of Graph::Easy's graph description language recognized by Graph::Easy::Marpa V 1.02.

This table has been exported from an OpenOffice Calc spreadsheet as a CSV file, with the latter being incorporated into this HTML.

The lexer which reads the STT does not use the last 2 columns, Regexp and Interpretation.

The Regexp column is referred to in the spreadsheet by formulas, and the Interpretation column is just for the reader.

Clearly, this table does not quite cover all of the syntax supported by Graph::Easy.

Graph::Easy::Marpa::Lexer reads this STT, and outputs tokens in an intermediary language.

The STT is actually at the end of Lexer.pm, but options to new() allow you to override that source for the STT.

The lexer uses Set::FA::Element to actually process the graph definition.

Graph::Easy::Marpa::Parser reads lexed tokens and builds a data structure in memory representing the graph.

Lastly, the default rendering engine Graph::Easy::Marpa::Renderer::GraphViz2 uses this data structure to create input for GraphViz2.

Note: The regexp for attribute values simply means the real processing takes place in sub validate_attribute_value within Graph::Easy::Marpa::Lexer::DFA, and, specifically, attribute values can be quoted with either "..." or '...'. Such quotes are stripped.

Start
Accept
State
Event
Next
Entry
Exit
Regexp
Interpretation
Yes
.
global
(?:edge|global|graph|group|node)(?:\.[a-z]+)?
class
.
save_class_name
[a-z]+\s*:
Attribute name
.
.
.
(?:->|--)
start_edge
.
.
[^}]+}
Attribute value
.
.
.
\(
start_group
.
.
(?:edge|global|graph|group|node)(?:\.[a-z]+)?
Class name
.
.
.
\[
start_node
.
.
(?:->|--)
Edge name
.
.
.
\s+
global
.
.
[a-zA-Z_][a-zA-Z_0-9]*
Event name
.
.
.
.
.
.
.
[a-zA-Z_.][a-zA-Z_0-9. ]*:
Group name
.
.
.
.
.
.
.
[^\]]*]
Node name
.
.
class
,
daisy_chain_class
validate_class_name
.
[a-zA-Z_][a-zA-Z_0-9]*
State name
.
.
.
{
start_class_attribute
.
.
.
.
.
.
.
\(
start_group
.
.
[a-zA-Z_0-9. ]
Real node name
.
.
.
\[
start_node
.
.
.
.
.
.
.
(?:->|--)
start_edge
.
.
.
.
.
.
.
\s+
class
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
start_class_attribute
[a-z]+\s*:
class_attribute_value
.
save_class_attribute_name
.
.
.
.
.
.
.
.
.
.
.
.
.
class_attribute_value
[^}]+}
post_class_attribute
validate_class_attribute_name
save_class_attribute_value
.
.
.
.
.
.
.
.
.
.
.
.
.
daisy_chain_class
(?:edge|global|graph|group|node)(?:\.[a-z]+)?
class
.
save_class_name
.
.
.
.
.
\s+
daisy_chain_class
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
post_class_attribute
(?:edge|global|graph|group|node)(?:\.[a-z]+)?
class
validate_class_attribute_value
save_class_name
.
.
.
.
.
\(
start_group
.
.
.
.
.
.
.
\[
start_node
.
.
.
.
.
.
.
(?:->|--)
start_edge
.
.
.
.
.
.
.
\s+
post_class_attribute
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
start_group
[a-zA-Z_.][a-zA-Z_0-9. ]*:
group
push_group
save_group_name
.
.
.
.
.
(?:->|--)
start_edge
.
.
.
.
.
.
.
\)
post_group
.
.
.
.
.
.
.
\s+
start_group
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
group
(?:edge|global|graph|group|node)(?:\.[a-z]+)?
class
validate_group_name
.
.
.
.
.
.
\[
start_node
.
.
.
.
.
.
.
(?:->|--)
start_edge
.
.
.
.
.
.
.
\s+
group
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Yes
post_group
{
start_attribute
pop_group
.
.
.
.
.
.
\[
start_node
.
.
.
.
.
.
.
\(
start_group
.
.
.
.
.
.
.
(?:->|--)
start_edge
.
.
.
.
.
.
.
\s+
post_group
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Yes
start_node
[^\]]*]
post_node
.
save_node_name
.
.
.
.
.
\s+
start_node
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Yes
post_node
{
start_attribute
validate_node_name
.
.
.
.
.
.
\(
start_group
.
.
.
.
.
.
.
\)
post_group
.
.
.
.
.
.
.
\[
start_node
.
.
.
.
.
.
.
(?:->|--)
start_edge
.
.
.
.
.
.
.
,
daisy_chain_node
.
.
.
.
.
.
.
\s+
post_node
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
start_attribute
[a-z]+\s*:
attribute_value
.
save_attribute_name
.
.
.
.
.
\s+
start_attribute
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
attribute_value
[^}]+}
post_attribute
validate_attribute_name
save_attribute_value
.
.
.
.
.
.
.
.
.
.
.
.
Yes
post_attribute
\(
start_group
validate_attribute_value
.
.
.
.
.
.
\)
post_group
.
.
.
.
.
.
.
\[
start_node
.
.
.
.
.
.
.
(?:->|--)
start_edge
.
.
.
.
.
.
.
,
post_attribute
.
.
.
.
.
.
.
\s+
post_attribute
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Yes
start_edge
{
start_attribute
save_edge_name
validate_edge_name
.
.
.
.
.
\(
start_group
.
.
.
.
.
.
.
\)
post_group
.
.
.
.
.
.
.
\[
start_node
.
.
.
.
.
.
.
,
daisy_chain_edge
.
.
.
.
.
.
.
\s+
start_edge
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Yes
daisy_chain_node
\[
start_node
.
.
.
.
.
.
.
\s+
daisy_chain_node
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Yes
daisy_chain_edge
(?:->|--)
start_edge
.
.
.
.
.
.
.
\s+
daisy_chain_edge
.
.
.
.
Start
Accept
State
Event
Next
Entry
Exit
Regexp
Interpretation