Calculators

The calculator examples live in the org.parboiled.examples.calculators package and are a series of example parsers show-casing various parboiled solution approaches around a simple calculator language.

The first one, the CalculatorParser0 is a simple recognizer for the following basic grammar, without any parser actions:

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

The calculator examples 1 through 4 gradually add more functionality to the parser and are a worthy source of inspiration for parboiled newbies and advanced users alike.

Content

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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Calculators

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