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I have a project where a user needs to define a set of instructions for a ui that is completely written in javascript. I need to have the ability to parse a string of instructions and then translate them into instructions. Is there any libraries out there for parsing that are 100% javascript? Or a generator that will generate in javascript? Thanks!
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Lexing is conversion of text (stream of characters) to stream of tokens. One token can be represented by multiple characters. For example source code function a() { var a = 1; }
A lexer is the part of an interpreter that turns a sequence of characters (plain text) into a sequence of tokens. A parser, in turn, takes a sequence of tokens and produces an abstract syntax tree (AST) of a language. The rules by which a parser operates are usually specified by a formal grammar.
A lexer is basically a tokenizer, but it usually attaches extra context to the tokens -- this token is a number, that token is a string literal, this other token is an equality operator.
A lexer is a software program that performs lexical analysis. ... A parser goes one level further than thelexer and takes the tokens produced by the lexer and tries to determine if proper sentences have been formed. Parsers work at the grammatical level, lexerswork at the word level.
Something like http://jscc.phorward-software.com/, maybe?
JS/CC is the first available parser development system for JavaScript and ECMAScript-derivates. It has been developed, both, with the intention of building a productive compiler development system and with the intention of creating an easy-to-use academic environment for people interested in how parse table generation is done general in bottom-up parsing.
The platform-independent software unions both: A regular expression-based lexical analyzer generator matching individual tokens from the input character stream and a LALR(1) parser generator, computing the parse tables for a given context-free grammar specification and building a stand-alone, working parser. The context-free grammar fed to JS/CC is defined in a Backus-Naur-Form-based meta language, and allows the insertion of individual semantic code to be evaluated on a rule's reduction.
JS/CC itself has been entirely written in ECMAScript so it can be executed in many different ways: as platform-independent, browser-based JavaScript embedded on a Website, as a Windows Script Host Application, as a compiled JScript.NET executable, as a Mozilla/Rhino or Mozilla/Spidermonkey interpreted application, or a V8 shell script on Windows, *nix, Linux and Mac OSX. However, for productive execution, it is recommended to use the command-line versions. These versions are capable of assembling a complete compiler from a JS/CC parser specification, which is then stored to a .js JavaScript source file.
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