Simple Calculator

The Simple Calculator example lives in the org.parboiled.examples.calculators package and is a set of two example parsers show-casing a simple recognizer and an actual calculator built with parboiled for Scala.

The first one, the SimpleCalculator0 is a simple recognizer for the following basic grammar, without any parser actions:

Expression ← Term ((‘+’ / ‘-’) Term)*
Term ← Factor ((‘*’ / ‘/’) Factor)*
Factor ← Number / Parens
Number ← Digit+
Parents ← ‘(’ expression ‘)’
Digit ← [0-9]

The SimpleCalculator1 examples adds parser actions that perform the actual calculations directly on the parsers value stack, without first creating an AST for the expression.
catch(err) {}

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Introduction
... Motivation
... Features
... Simple Java Example
... Simple Scala Example
... RegEx vs. parboiled vs. Parser Generators
... Projects using parboiled
Installation
Concepts
... The Big Picture
... The Rule Tree
... The Value Stack
... The Parse Tree
... AST Construction
... Parse Error Handling
parboiled for Java
... Rule Construction in Java
... Parser Action Expressions
... Working with the Value Stack
... Action Variables
... Parser Extension in Detail
... Style Guide
... Java Examples
...... ABC Grammar
...... Calculators
...... Time Parser
...... Java Parser
...... Markdown processor
parboiled for Scala
... Rule Construction in Scala
... Parser Actions in Scala
... Parser Testing in Scala
... Scala Examples
...... Simple Calculator
...... JSON Parser
Advanced Topics
... Handling Whitespace
... Parsing Performance Tuning
... Indentation Based Grammars
... The ProfilingParseRunner
... Grammar and Parser Debugging
... Thread Safety
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Simple Calculator

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