Nez Language Specification (Version 1.0)

Table of Contents

• Productions
• Expressions

Productions

A production is a mapping of a nonterminal name A into an parsing expression e.

A = e

Expressions

Terminals

• 'abc' - match the exactly same string 'abc'
• . - match any single byte characters
• [A-Z] - match characters ranging from 'A' to 'Z'
• [Aa] - match either 'A' or 'a'

NonTerminals

• NonTerminal
• "string"

PEG operators

• e1 e2- sequence
• e2 / e2 - choice
• e? - option
• e* - repetition
• e+ - one more repetition (e e*)
• &e - and lookahead predicate
• !e - not lookahead predicate

AST constructors

• {e} - creating a new node with capturing a substring that is matched with e.
• @e - linking a child node that is constructed with e to the left node
• {@ e}
• #Tag - tagging #Tag to the left node
• str - replacing a captured string of the left node with the specified string str

Symbol table

(TBA)

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