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language.ebnf
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184 lines (157 loc) · 3.11 KB
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(* ================================================================= *)
(* BRIDGE LANGUAGE V1.5 (ISO/IEC 14977 COMPLIANT) *)
(* ================================================================= *)
(* --- 1. TOP LEVEL BLOCKS --- *)
program
= "version 1.5", { const
| bridge
| define
| tool };
const
= "const", identifier, "=", json;
bridge
= "bridge", identifier, "{", { statement }, "}";
define
= "define", identifier, "{", { statement }, "}";
tool
= "tool", identifier, "from", identifier, "{", { statement }, [ "on error", "=", json ], "}";
(* --- 2. STATEMENTS & SCOPE --- *)
statement
= with
| wire
| wire_alias
| scope
| spread
| force;
with
= "with", identifier, [ "as", identifier ];
scope
= target, "{", { statement }, "}";
(* Standard assignment *)
wire
= target, ( routing
| "=", json );
(* Local memory assignment *)
wire_alias
= "alias", identifier, routing;
(* Merge into current scope object *)
spread
= "...", routing;
(* Eager side-effect evaluation *)
force
= "force", identifier, [ "catch", "null" ];
(* --- 3. SHARED PATHS & ROUTING --- *)
target
= [ "." ], identifier, { ".", identifier };
(* The Right-Hand Side Evaluation Chain *)
routing
= "<-", expression, { ( "||"
| "??" ), expression }, [ "catch", expression ];
(* --- 4. EXPRESSIONS & REFERENCES --- *)
ref
= identifier, [ [ "?" ], ".", identifier ], { [ "?" ], ".", identifier };
(* An expression is a piped value, optionally followed by a ternary gate *)
expression
= pipe_chain, [ "?", expression, ":", expression ];
(* A pipe chain allows infinite routing: handle:handle:source *)
pipe_chain
= { identifier, [ ".", identifier ], ":" }, base_expression;
base_expression
= json
| ref, "[]", "as", identifier, "{", { statement }, "}"
| ref
| ( "throw"
| "panic" ), [ string ]
| ( "continue"
| "break" ), [ integer ];
(* --- 5. EMBEDDED JSON (RFC 8259) --- *)
json
= object
| array
| string
| number
| "true"
| "false"
| "null";
object
= "{", [ string, ":", json, { ",", string, ":", json } ], "}";
array
= "[", [ json, { ",", json } ], "]";
(* --- 6. LEXICAL RULES (TOKENS) --- *)
identifier
= letter, { letter
| digit
| "_" };
string
= '"', { character - '"' }, '"'
| "'", { character - "'" }, "'";
number
= [ "-" ], integer, [ ".", integer ];
integer
= digit, { digit };
letter
= "a"
| "b"
| "c"
| "d"
| "e"
| "f"
| "g"
| "h"
| "i"
| "j"
| "k"
| "l"
| "m"
| "n"
| "o"
| "p"
| "q"
| "r"
| "s"
| "t"
| "u"
| "v"
| "w"
| "x"
| "y"
| "z"
| "A"
| "B"
| "C"
| "D"
| "E"
| "F"
| "G"
| "H"
| "I"
| "J"
| "K"
| "L"
| "M"
| "N"
| "O"
| "P"
| "Q"
| "R"
| "S"
| "T"
| "U"
| "V"
| "W"
| "X"
| "Y"
| "Z";
digit
= "0"
| "1"
| "2"
| "3"
| "4"
| "5"
| "6"
| "7"
| "8"
| "9";
character
= ? any valid unicode character ?;