84 lines
2.8 KiB
JavaScript
84 lines
2.8 KiB
JavaScript
var Generator = require("jison").Generator;
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var system = require("system");
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var fs = require("file");
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exports.grammar = {
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"comment": "ECMA-262 5th Edition, 15.12.1 The JSON Grammar. Parses JSON strings into objects.",
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"author": "Zach Carter",
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"lex": {
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"macros": {
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"digit": "[0-9]",
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"esc": "\\\\",
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"int": "-?(?:[0-9]|[1-9][0-9]+)",
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"exp": "(?:[eE][-+]?[0-9]+)",
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"frac": "(?:\\.[0-9]+)"
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},
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"rules": [
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["\\s+", "/* skip whitespace */"],
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["{int}{frac}?{exp}?\\b", "return 'NUMBER';"],
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["\"(?:{esc}[\"bfnrt/{esc}]|{esc}u[a-fA-F0-9]{4}|[^\"{esc}])*\"", "yytext = yytext.substr(1,yyleng-2); return 'STRING';"],
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["\\{", "return '{'"],
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["\\}", "return '}'"],
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["\\[", "return '['"],
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["\\]", "return ']'"],
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[",", "return ','"],
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[":", "return ':'"],
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["true\\b", "return 'TRUE'"],
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["false\\b", "return 'FALSE'"],
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["null\\b", "return 'NULL'"]
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]
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},
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"tokens": "STRING NUMBER { } [ ] , : TRUE FALSE NULL",
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"start": "JSONText",
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"bnf": {
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"JSONString": [[ "STRING", "$$ = yytext;" ]],
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"JSONNumber": [[ "NUMBER", "$$ = Number(yytext);" ]],
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"JSONNullLiteral": [[ "NULL", "$$ = null;" ]],
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"JSONBooleanLiteral": [[ "TRUE", "$$ = true;" ],
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[ "FALSE", "$$ = false;" ]],
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"JSONText": [[ "JSONValue", "return $$ = $1;" ]],
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"JSONValue": [[ "JSONNullLiteral", "$$ = $1;" ],
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[ "JSONBooleanLiteral", "$$ = $1;" ],
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[ "JSONString", "$$ = $1;" ],
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[ "JSONNumber", "$$ = $1;" ],
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[ "JSONObject", "$$ = $1;" ],
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[ "JSONArray", "$$ = $1;" ]],
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"JSONObject": [[ "{ }", "$$ = {};" ],
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[ "{ JSONMemberList }", "$$ = $2;" ]],
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"JSONMember": [[ "JSONString : JSONValue", "$$ = [$1, $3];" ]],
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"JSONMemberList": [[ "JSONMember", "$$ = {}; $$[$1[0]] = $1[1];" ],
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[ "JSONMemberList , JSONMember", "$$ = $1; $1[$3[0]] = $3[1];" ]],
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"JSONArray": [[ "[ ]", "$$ = [];" ],
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[ "[ JSONElementList ]", "$$ = $2;" ]],
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"JSONElementList": [[ "JSONValue", "$$ = [$1];" ],
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[ "JSONElementList , JSONValue", "$$ = $1; $1.push($3);" ]]
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}
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};
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var options = {type: "slr", moduleType: "commonjs", moduleName: "jsonparse"};
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exports.main = function main (args) {
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var cwd = fs.path(fs.cwd()),
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code = new Generator(exports.grammar, options).generate(),
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stream = cwd.join(options.moduleName+".js").open("w");
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stream.print(code).close();
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};
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if (require.main === module)
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exports.main(system.args);
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