| # Copyright (c) 2019, Google Inc. | |
| # | |
| # Permission to use, copy, modify, and/or distribute this software for any | |
| # purpose with or without fee is hereby granted, provided that the above | |
| # copyright notice and this permission notice appear in all copies. | |
| # | |
| # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
| # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY | |
| # SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION | |
| # OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN | |
| # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 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]+ |