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adding precedence to the Jison parser

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Jeremy Ashkenas
2010-01-31 12:55:00 -05:00
parent 3a748755df
commit db00cd6ed4
2 changed files with 139 additions and 3 deletions
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82
src/parser.coffee
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@@ -13,6 +13,31 @@ o: (pattern_string, func) ->
else
[pattern_string, '$$ = $1;']
# Precedence ===========================================================
operators: [
["left", '?']
["right", 'NOT', '!', '!!', '~', '++', '--']
["left", '*', '/', '%']
["left", '+', '-']
["left", '<<', '>>', '>>>']
["left", '&', '|', '^']
["left", '<=', '<', '>', '>=']
["right", '==', '!=', 'IS', 'ISNT']
["left", '&&', '||', 'AND', 'OR']
["right", '-=', '+=', '/=', '*=', '%=']
["right", 'DELETE', 'INSTANCEOF', 'TYPEOF']
["left", '.']
["right", 'INDENT']
["left", 'OUTDENT']
["right", 'WHEN', 'LEADING_WHEN', 'IN', 'OF', 'BY']
["right", 'THROW', 'FOR', 'NEW', 'SUPER']
["left", 'EXTENDS']
["left", '||=', '&&=', '?=']
["right", 'ASSIGN', 'RETURN']
["right", '->', '=>', 'UNLESS', 'IF', 'ELSE', 'WHILE']
]
# Grammar ==============================================================
grammar: {
@@ -167,6 +192,61 @@ grammar: {
o "Expression IN Expression", -> new OpNode($2, $1, $3)
]
# Try abbreviated expressions to make the grammar build faster:
# UnaryOp: [
# o "!"
# o "!!"
# o "NOT"
# o "~"
# o "--"
# o "++"
# o "DELETE"
# o "TYPEOF"
# ]
#
# BinaryOp: [
# o "*"
# o "/"
# o "%"
# o "+"
# o "-"
# o "<<"
# o ">>"
# o ">>>"
# o "&"
# o "|"
# o "^"
# o "<="
# o "<"
# o ">"
# o ">="
# o "=="
# o "!="
# o "IS"
# o "ISNT"
# o "&&"
# o "||"
# o "AND"
# o "OR"
# o "?"
# o "-="
# o "+="
# o "/="
# o "*="
# o "%="
# o "||="
# o "&&="
# o "?="
# o "INSTANCEOF"
# o "IN"
# ]
#
# Operation: [
# o "Expression BinaryOp Expression", -> new OpNode($2, $1, $3)
# o "UnaryOp Expression", -> new OpNode($1, $2)
# ]
# The existence operator.
Existence: [
o "Expression ?", -> new ExistenceNode($1)
@@ -426,7 +506,7 @@ for name, non_terminal of grammar
option[1] = "return " + option[1]
option
tokens: tokens.join(" ")
parser: new Parser({tokens: tokens, bnf: bnf}, {debug: false})
parser: new Parser({tokens: tokens, bnf: bnf, operators: operators}, {debug: false})
# Thin wrapper around the real lexer
parser.lexer: {