Some bug fixes, syntax tweaks, added ^^/$$/__, and bpeg meta grammar.

1 files changed, 59 insertions, 0 deletions

diff --git a/bpeg.bpeg b/bpeg.bpeg
new file mode 100644
index 0000000..b90f7d0
--- /dev/null
+++ b/bpeg.bpeg
@@ -0,0 +1,59 @@
+# This is a file defining the BPEG grammar using BPEG syntax
+
+grammar;
+grammar = __ @[mainPattern]extendedPat __ (*def % (__`;__)) ?(__ `;) __;
+def = @[name]ref __ `= __ @[definition]extendedPat;
+
+# This is used for command line arguments:
+stringGrammar = *(`\ pat ?`; / .);
+
+pat = empty / dot / string / charRange / char / escape / no / anythingBut
+    / uptoAnd / repeat / after / before / capture / replace / ref / parens;
+
+empty = `/ >(__ (`}/`}));
+dot = `.;
+string = (
+        `" @[s]*(escape / ~`") `"
+      / `' @[s]*(escape / ~`') `'
+    );
+charRange = `` @[low]. `- @[high].;
+char = `` @[s].;
+escape = `\ @[s](
+        1-3 `0-7
+      / `x 2 (`0-9/`a-f/`A-F)
+      /`a/`b/`e/`n/`r/`t/`v / . / \n
+    );
+no = `! _ @pat;
+anythingBut = `~ _ @pat;
+uptoAnd = `& _ @pat;
+repeat = (
+           @[min]int _ `- _ @[max]int
+      /    @[min]{->"0"}    @[max]int _ `-
+      /    @[min]int _ `+   @[max](/)
+      /    @[min]           @[max]int
+      / `+ @[min]{->"1"}    @[max](/)
+      / `* @[min]{->"0"}    @[max](/)
+      / `? @[min]{->"0"}    @[max]{->"1"}
+    ) _ @[repeatPat]pat ?( __ `% __ @[sep]pat);
+after = `< _ pat;
+before = `> _ pat;
+capture = `@ ?(_ `[ @[captureName]ref `]) _ @[capture]pat;
+replace = `{ __ (
+      ?(@[replacePat]extendedPat __) "=>" ?(__ @[replacement]string)
+    ) __ `};
+ref = @[name](
+        "^^" / "^" / "__" / "_" / "$$" / "$" /
+        (`a-z/`A-Z) *(`a-z/`A-Z/`0-9));
+
+parens = `( __ extendedPat __ `);
+
+chain = +@pat % (__);
+otherwise = +@(chain/pat) % (__`/__);
+extendedPat = otherwise / chain / pat;
+
+_ = *(`  / \t);
+__ = *(`  / \t / \r / \n / comment);
+hashComment = `# *.;
+
+# Note: comments are undefined by default in regular BPEG
+comment = hashComment;