Package com.singularsys.extensions.structure

package com.singularsys.extensions.structure

Provides limited support for block style programming with for, if and while statements.

The structure package provides limited support for block style programming with if, for and while statements. The exact syntax can be configurable to give a Java, Pascal or Basic like syntax. It is not intended to be a fully featured parser more a way to add some structured programming elements like simple loops to Jep code.

The StandardStructuredParser provides a ready made parser with a java-like syntax. It supports:

• Statements separated by semi-colons x=5; y=x^2;
• Blocks enclosed in curly-brackets { x=5; y=6; }
• If statements if(x==5) {y=6;} else {y=7;}
• For statements for(j=0;j<=10;++j) x+=j;
• While statements while(x<10) x+=2;
• Break and continue statements inside looks.

Alternative syntaxes can be built up using the StructuredGrammarParser and a set of GrammaticalRuleI. Rules are provided for most types of statements.

The StructuredEvaluator is used to evaluate sequences of expressions after parsing.

Since:

Jep 3.5 / Extensions 2.0

See Also:

• StructuredConsole
• Documentation

Related Packages

Package	Description
com.singularsys.extensions	Extensions to the main Jep package.
com.singularsys.extensions.structure.fieldJavaOps	Provides field aware versions of the com.singularsys.jep.misc.javaops pre and post increment and decrement functions.

Class	Description
BlockRule	Parse a statement block { sequence }.
ControlNode	A node representing a control statement such as break or continue.
ControlRule	Parses break and continue statements
ExpressionRule	Parses an expression.
GrammaticalRuleI	Indicates rules for parsing structured code.
IfNode	A node representing an if statement.
JavaForRule	Parses a java-style for loop for(i=0;i<10;++i) x+=i;.
JavaIfRule	Parse a java style if statement: if(expr) statement [ else statement ]
JavaWhileRule	Parse a Java-style while loop while(x<10) x=x+1;
LoopNode	A node represents a looping construct such as a for or while loop.
LoopNode.ControlValues	Special values to indicate break and continue statements Used by ControlRule and ControlNode.
PossiblyTerminatedExpressionRule	Parse an expression followed by an optional separator.
SequenceNode	A node representing a sequence of expressions.
SequenceRule	Parses a sequence of statements
SequenceSeparatorRule	Parses a sequence of statements separated by a separator
StandardStructuredParser	A structured parser with a java like grammar.
StatementRule	Parse a single statement from a list of possibilities.
StructuredEvaluator	An evaluator which works with structured programming.
StructuredGrammarParser	A grammar parser which works with structured programming.
StructuredParser	Base class for defining a parser for structured code.
StructureNode	Base class for all structure nodes, defines an eval method.
TerminatedExpressionRule	Parse an expression followed by a separator.