Tagged parsing | F# Snippets

Snippets tagged parsing

Parsing string expressions, the lazy way

Sometimes you'd be surprised at what functionality you can find inside the .Net framework. Apparently the DataTable object can compute string expressions. Nice for testing your own parser implementation, and/or for lazy coders like me. Note that the DataTable is created only once and reused with each function call.
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Posted: 13 years ago by Arjen Kopinga
Uri Parser

A Uri parser using the Cashel library [1]. This implementation is using ArraySegment as the underlying state, as I'm using it within a server, but it would be trivial to switch it to using a list. Also, note that I am not parsing the Uri into any specific structure, though that, too, would be trivial. For my current purposes, I just needed to validate the Uri. [1] https://github.com/panesofglass/cashel
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Posted: 13 years ago by Ryan Riley
Yet another command-line parser

The snippet shows a parser for command-line arguments supporting value lists for single commands. Calling with the following arguments: "Arg 1" "Arg 2" -test "Case 1" "Case 2" -show -skip "tag" produces the following map: map [("", seq ["Arg 1"; "Arg 2"]); ("show", seq []); ("skip", seq ["tag"]);("test", seq ["Case 1"; "Case 2"])] which can be used to find what data have been sent along with different commands. Calling with the following: "Arg 1" "Arg 2" /test="Case 1" "Case 2" --show /skip:tag produces the same result.
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Posted: 13 years ago by Gennady Loskutov
JSON parsing with monads

JSON parsing with monads. See also "Expression parsing with monads" (http://fssnip.net/bi). Author URL: http://www.zbray.com
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Posted: 12 years ago by Zach Bray
Parse locale files

This uses fparsec to parse locale files of hte form Id = text {arg:type} = newline = newlne For use with localization.
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Posted: 11 years ago by devshorts
Log file parsing

File parsing, based on multiple lines, using recursive pattern matching with many :: (cons) operator
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Posted: 11 years ago by Tuomas Hietanen
Log file parser for log4Net files

Log file parser for log4Net files
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Posted: 11 years ago by Tuomas Hietanen
A Simple Parser

This is a basic parser that I wrote which takes heavily from the examples in Dom Syme's Expert F# book and http://fsharpforfunandprofit.com/posts/pattern-matching-command-line/
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Posted: 10 years ago by Joe C
Simple AST parser

Parsers a minimal expression tree allowing for functions of the form "func(arg1,arg2,...)->{body}"
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Posted: 7 years ago by devshorts
Small Basic Parser

Small Basic abstract syntax tree, parser and interpreter. Supports Small Basic's keywords and arithmetic, logical and comparison operators.
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Posted: 6 years ago by Phillip Trelford
Simple FParsec int32 parser

Like FParsec's pint32, but accepts only optionally-signed base-10 input
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Posted: 5 years ago by Mark Laws
Functional wrappers for TryParse APIs

Exemplary convenience wrappers for some of the System..TryParse APIs, using the combined power of F#' return value deconstruction mechanism via pattern matching, active patterns and option types instead of "out/ref" parameters. Added support for newest versions of F# to determine which overload of TryParse should be used.
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Posted: 5 years ago by Novox
10 PRINT CHR$(205.5+RND(1)); : GOTO 10

Inspired by https://10print.org, this is a small incomplete BASIC interpreter that can generate a maze.
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Posted: 4 years ago by Tomas Petricek
Parse bindingRedirects with Linq2Xml

Find binding-redirects with linq-to-xml from a .config file. This might be useful for then parsing config-changes e.g. by System.Linq.Enumerable.Except
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Posted: 1 year ago by Tuomas Hietanen

Lazily split string

Splits strings lazily, instead of splitting entire string into an array like System.String.Split. Especially useful for very large strings.
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Posted: 13 years ago by Daniel Robinson
sscanf - parsing with format strings

A more complete version of sscanf, as proposed on stackoverflow by kvb: http://stackoverflow.com/questions/2415705/read-from-console-in-f Fixed bug in previous version to work with visual studio '13
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Posted: 13 years ago by Wolfgang Meyer
Loading .fs files

This script facilitates to load all the .fs files in the specified F# project in correct compilation order.
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Posted: 12 years ago by nagat01
Speech Stackoverflow article automatically

This snippet automatically speeches text of question,answers and comments in a Stackoverflow article. It requires HtmlAgilityPack(available from Nuget package manager).(Attention: You need reset F# interactive to stop the speech)
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Posted: 12 years ago by nagat01
Extract script blocks from html page (FP)

A bit more functional version of this: http://fssnip.net/iR
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Posted: 11 years ago by @kot_2010
A minimalist XML Parser

A minimalist XML Parser
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Posted: 11 years ago by Fabio Galuppo
KataBankOCR

See: http://codingdojo.org/cgi-bin/wiki.pl?KataBankOCR Prog. F# 2013 - London
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Posted: 11 years ago by Zach Bray
Simple four function calculator

This is a simple four function calculator using FParsec. It would be easy to replace the FParsec combinators with simple parsing combinators to produce the same results, but without the nice error messages produced by FParsec.
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Posted: 9 years ago by Vesa Karvonen
Int32.tryParse

Converts the string representation of a number in-place to an Int32. A return value of None indicates the conversion failed.
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Posted: 7 years ago by Phillip Trelford
Parsing UserAgent strings with FSharp

Identify user's browser, Os and device by the browser's UserAgent string.
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Posted: 5 years ago by Tuomas Hietanen
Complete lambda calculus interpreter with example of Y-combinator recursion

Calculate triangle numbers in the most inefficient way possible!
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Posted: 5 years ago by Brian Berns
Simple C# Parser

Simple prototype C# AST and parser using the FParsec parser combinator library. Parses a subset of C# 1.1 constructs.
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Posted: 4 years ago by Phillip Trelford
Extract script blocks from html page

This module extracts all the blocks out of an html page's header. This can be useful if you are writing tools to merge all the js for future minifaction, or for otherwise manipulating the files.
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Posted: 3 years ago by devshorts
Using Utf8JsonReader from System.Text.Json with FSharp

High-performance JSON parsing with System.Text.Json and F#
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Posted: 1 year ago by Tuomas Hietanen