still.todo

# summary

* [ ] Summarize fields, infer data types

# schema

* [ ] Version
* [ ] Comments
* [ ] @rules (e.g. @ignoreCase)
* [ ] Configure functions to allow for explicit column references
* [ ] Figure out how to handle NA columns @ignoreNA ?
* [ ] Optional directive

# directives

* [ ] @explicit
* [ ] @ordered

# @vectorops
-> Enable vector operations and functions?
-> Loads entire dataset and passes vectors

* [ ] cum_mean
* [ ] last

# @bloom_uniq

# input

* [x] excel
* [x] gzipped files

# output

* [ ] Filter invalid records?
* [ ] JSON with invalids
* [ ] HTML with invalids
* [ ] Text file with invalids

# Data dictionary

* [ ] Sumarize fields and infer data types and output
* [ ] Output formats
    * [ ] HTML
    * [ ] Markdown
    * [ ] TSV
* [ ] Cardinality

# config

* [ ] Raise errors on malformed configuration

# CLI

* [ ] Enable multi-file running (still validate schema csv1 csv2 csv3...)
* [ ] ansi-style log (e.g. nextflow?)

# Performance

* [ ] Pre-process evaluation of rules
* [ ] Parallelize rules

# Functions

* [ ] VersionDecl	::=	("version 1.0" | "version 1.1")	
* [ ] QuotedDirective	::=	DirectivePrefix "quoted"	
* [ ] TotalColumnsDirective	::=	DirectivePrefix "totalColumns" PositiveNonZeroIntegerLiteral	
* [ ] PermitEmptyDirective	::=	DirectivePrefix "permitEmpty"	
* [ ] NoHeaderDirective	::=	DirectivePrefix "noHeader"	
* [ ] IgnoreColumnNameCaseDirective	::=	DirectivePrefix "ignoreColumnNameCase"	
* [x] Comment	::=	SingleLineComment | MultiLineComment	
* [ ] SingleLineComment	::=	//[\S\t ]*	/* xgc:regular-expression */
* [ ] MultiLineComment	::=	\/\*(?:[^*\r\n]+|(?:\r?\n))*\*\/	/* xgc:regular-expression */
* [ ] QuotedColumnIdentifier	::=	StringLiteral	
* [x] ColumnRule	::=	ColumnValidationExpr* ColumnDirectives	
* [ ] ColumnDirectives	::=	OptionalDirective? MatchIsFalseDirective? IgnoreCaseDirective? WarningDirective?	/* xgc:unordered */
* [ ] OptionalDirective	::=	DirectivePrefix "optional"	
* [ ] MatchIsFalseDirective	::=	DirectivePrefix "matchIsFalse"	
* [ ] IgnoreCaseDirective	::=	DirectivePrefix "ignoreCase"	
* [ ] WarningDirective	::=	DirectivePrefix "warningDirective"	
* [ ] ExplicitContextExpr	::=	ColumnRef "/"	
* [ ] NumericOrAny	::=	NumericLiteral | WildcardLiteral
* [ ] PositiveIntegerOrAny	::=	PositiveIntegerLiteral | WildcardLiteral	
* [ ] EmptyExpr	::=	"empty"	
* [ ] NotEmptyExpr	::=	"notEmpty"	

# Misc.

* [ ] Logo