| # 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]+ |
