Sha256: ce2cce659adf31b16ac2ae189c6eac88780d15a17c52004c4dfe09e22da02416
Contents?: true
Size: 1.76 KB
Versions: 7
Compression:
Stored size: 1.76 KB
Contents
var Jison = require("../setup").Jison,
Lexer = require("../setup").Lexer,
assert = require("assert");
var lexData = {
rules: [
["x", "return 'x';"],
["y", "return 'y';"]
]
};
exports["test left-recursive nullable grammar"] = function () {
var grammar = {
tokens: [ 'x' ],
startSymbol: "A",
bnf: {
"A" :[ 'A x',
'' ]
}
};
var parser = new Jison.Parser(grammar, {type: "lr0"});
parser.lexer = new Lexer(lexData);
assert.ok(parser.parse('xxx'), "parse 3 x's");
assert.ok(parser.parse("x"), "parse single x");
assert["throws"](function () {parser.parse("y")}, "throws parse error on invalid token");
};
exports["test right-recursive nullable grammar"] = function () {
var grammar = {
tokens: [ 'x' ],
startSymbol: "A",
bnf: {
"A" :[ 'x A',
'' ]
}
};
var gen = new Jison.Generator(grammar, {type: "lr0"});
assert.ok(gen.table.length == 4, "table has 4 states");
assert.ok(gen.conflicts == 2, "encountered 2 conflicts");
};
exports["test 0+0 grammar"] = function () {
var lexData2 = {
rules: [
["0", "return 'ZERO';"],
["\\+", "return 'PLUS';"]
]
};
var grammar = {
tokens: [ "ZERO", "PLUS"],
startSymbol: "E",
bnf: {
"E" :[ "E PLUS T",
"T" ],
"T" :[ "ZERO" ]
}
};
var parser = new Jison.Parser(grammar, {type: "lr0"});
parser.lexer = new Lexer(lexData2);
assert.ok(parser.parse("0+0+0"), "parse");
assert.ok(parser.parse("0"), "parse single 0");
assert["throws"](function () {parser.parse("+")}, "throws parse error on invalid");
};
Version data entries
7 entries across 7 versions & 1 rubygems