package main

type Statement Peg {}

Statement <- WS? (Assignment / Action / Expression) WS? !.
Assignment <- Variable WS? '=' WS? Expression
Variable <- [a-zA-Z_][a-zA-Z0-9_]*
Expression <- (StringLiteral / Indexing / Search / Variable)
StringLiteral <- '"' QuotedText '"'
QuotedText <- (EscapedChar / [^\\"])*
EscapedChar <- '\\' [\\n"]
Indexing <- Variable ('[' Index ']')+
Index <- [0-9a-z]+
Search <- Variable '[' WS? 'where' WS Query ']'
Action <- Expression '.' Command
Command <- Function '(' Args? ')'
Function <- [a-zA-Z]+
Args <- StringLiteral (WS? ',' WS? Args)
Query <- Conjunctions (WS? '||' WS? Conjunctions)?
Conjunctions <- Conjunction (WS? '&&' WS? Conjunctions)?
Conjunction <- Field WS? Relation WS? StringLiteral
Field <- [a-z][a-zA-Z0-9]*
Relation <- ('==' / '!=' / 'contains' / 'startsWith' / 'endsWith')

WS <- [ \t]+