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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /third_party/rust/jsparagus/pgen.pgen | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/jsparagus/pgen.pgen')
-rw-r--r-- | third_party/rust/jsparagus/pgen.pgen | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/third_party/rust/jsparagus/pgen.pgen b/third_party/rust/jsparagus/pgen.pgen new file mode 100644 index 0000000000..36b7483bb0 --- /dev/null +++ b/third_party/rust/jsparagus/pgen.pgen @@ -0,0 +1,89 @@ +# Grammar for the pgen parser specification language +# +# This was used to bootstrap the parser for the emu-grammar parser +# specification language, and it's not clear why we should have two things. +# Ignore this for now. + +var token IDENT; +var token STR; +var token MATCH; +var token COMMENT; +token Eq = "="; +token Arrow = "=>"; +token Semi = ";"; +token Token = "token"; +token Var = "var"; +token Nt = "nt"; +token Goal = "goal"; +token Some = "Some"; +token None = "None"; +token OpenBrace = "{"; +token CloseBrace = "}"; +token OpenParen = "("; +token CloseParen = ")"; +token Comma = ","; +token QuestionMark = "?"; + +goal nt grammar { + token_defs? nt_defs => grammar($0, $1); +} + +nt token_defs { + token_def => single($0); + token_defs token_def => append($0, $1); +} + +nt token_def { + "token" IDENT "=" STR ";" => const_token($1, $3); + "var" "token" IDENT ";" => var_token($2); +} + +nt nt_defs { + nt_def => nt_defs_single($0); + nt_defs nt_def => nt_defs_append($0, $1); +} + +nt nt_def { + COMMENT? "goal"? "nt" IDENT "{" prods? "}" => nt_def($0, $1, $3, $5); +} + +nt prods { + prod => single($0); + prods prod => append($0, $1); + COMMENT => empty($0); +} + +nt prod { + terms reducer? ";" => prod($0, $1); +} + +nt terms { + term => single($0); + terms term => append($0, $1); +} + +nt term { + symbol; + symbol "?" => optional($0); +} + +nt symbol { + IDENT => ident($0); + STR => str($0); +} + +nt reducer { + "=>" expr => $1; +} + +nt expr { + MATCH => expr_match($0); + IDENT "(" expr_args? ")" => expr_call($0, $2); + "Some" "(" expr ")" => expr_some($2); + "None" => expr_none(); +} + +nt expr_args { + expr => args_single($0); + expr_args "," expr => args_append($0, $2); +} |