excel-formula-utilities

This project is a port of the excel-formula library to ES6.
It contains a set of functions that can be used to pretty print Excel formulas and convert them into JavaScript, C# or Python code.

Key Differences from excel-formula:

• Removed external dependencies (Bootstrap, jQuery)
• Removed jQuery methods and replaced them with ES6 equivalents
• Modularized the library with support for tree-shaking
• Does not expose a global (window) variable
• Added isEu as an option to the getTokens, formatFormula and formatFormulaHTML methods
• Provides ES, CJS, and UMD module formats

Install

npm install excel-formula-utilities

Usage

Module bundler

import { formatFormula } from 'excel-formula-utilities'

const formattedFormula = formatFormula('SUM(A1:A2)')

Browser

<script src="https://unpkg.com/excel-formula-utilities"></script>
<script>
  const formattedFormula = ExcelFormulaUtilities.formatFormula('SUM(A1:A2)')
</script>

Available methods

formatFormula

Formats an excel formula.

Signature:
formatFormula(formula: string, options): string

• formula - The excel formula to format
• options - An optional object with the following properties:

Name	Description	Default
tmplFunctionStart	Template for the start of a function, the {{token}} will contain the name of the function.	'{{autoindent}}{{token}}(\n'
tmplFunctionStop	Template for when the end of a function has been reached.	'\n{{autoindent}}{{token}})'
tmplOperandError	Template for errors.	' {{token}}'
tmplOperandRange	Template for ranges and variable names.	'{{autoindent}}{{token}}'
tmplLogical	Template for logical operators	'{{token}}{{autolinebreak}}'
tmplOperandLogical	Template for logical operators such as + - = ...	'{{autoindent}}{{token}}'
tmplOperandNumber	Template for numbers.	'{{autoindent}}{{token}}'
tmplOperandText	Template for text/strings.	'{{autoindent}}"{{token}}"'
tmplArgument	Template for argument separators such as ,.	'{{token}}\n'
tmplOperandOperatorInfix	-	' {{token}}{{autolinebreak}}'
tmplFunctionStartArray	Template for the start of an array.	''
tmplFunctionStartArrayRow	Template for the start of an array row.	'{'
tmplFunctionStopArrayRow	Template for the end of an array row.	'}'
tmplFunctionStopArray	Template for the end of an array.	''
tmplSubexpressionStart	Template for the sub expression start.	'{{autoindent}}(\n'
tmplSubexpressionStop	Template for the sub expression stop.	'\n)'
tmplIndentTab	Template for the tab char.	'\t'
tmplIndentSpace	Template for space char.	' '
autoLineBreak	When rendering line breaks automatically which types should it break on.	'TOK_TYPE_FUNCTION | TOK_TYPE_ARGUMENT | TOK_SUBTYPE_LOGICAL | TOK_TYPE_OP_IN'
newLine	Used for the {{autolinebreak}} replacement as well as some string parsing.	'\n'
trim	Trim the output.	true
customTokenRender	This is a call back to a custom token function.	null
prefix	Add a prefix to the formula.	''
postfix	Add a suffix to the formula.	''
isEu	If truethen ; is treated as list separator, if false then ; is treated as array row separator	false

Template Values

• {{autoindent}} - apply auto indent based on current tree level
• {{token}} - the named token such as FUNCTION_NAME or "string"
• {{autolinebreak}} - apply line break automatically. tests for next element only at this point

customTokenRender Example

function (tokenString, token, indent, lineBreak) {
  const outStr = token
  const useTemplate = true

  // In the return object "useTemplate" tells formatFormula()
  // weather or not to apply the template to what your return from the "tokenString".
  return { tokenString: outStr, useTemplate }
}

formatFormulaHTML

Formats an excel formula into HTML.

Signature:
formatFormulaHTML(formula: string, options): string

• formula - The excel formula to format
• options - An optional object with the following properties (inherits defaults from formatFormula):

Name	Description	Default
tmplFunctionStart	Template for the start of a function, the {{token}} will contain the name of the function.	'{{autoindent}}<span class="function">{{token}}</span><span class="function_start">(</span><br />'
tmplFunctionStop	Template for when the end of a function has been reached.	'<br />{{autoindent}}{{token}}<span class="function_stop">)</span>'
tmplOperandError	Template for errors.	' {{token}}'
tmplOperandRange	Template for ranges and variable names.	'{{autoindent}}{{token}}'
tmplLogical	Template for logical operators	'{{token}}{{autolinebreak}}'
tmplOperandLogical	Template for logical operators such as + - = ...	'{{autoindent}}{{token}}'
tmplOperandNumber	Template for numbers.	'{{autoindent}}{{token}}'
tmplOperandText	Template for text/strings.	'{{autoindent}}<span class="quote_mark">"</span><span class="text">{{token}}</span><span class="quote_mark">"</span>'
tmplArgument	Template for argument separators such as ,.	'{{token}}<br />'
tmplOperandOperatorInfix	-	' {{token}}{{autolinebreak}}'
tmplFunctionStartArray	Template for the start of an array.	''
tmplFunctionStartArrayRow	Template for the start of an array row.	'{'
tmplFunctionStopArrayRow	Template for the end of an array row.	'}'
tmplFunctionStopArray	Template for the end of an array.	''
tmplSubexpressionStart	Template for the sub expression start.	'{{autoindent}}('
tmplSubexpressionStop	Template for the sub expression stop.	' )'
tmplIndentTab	Template for the tab char.	'<span class="tabbed">&nbsp;&nbsp;&nbsp;&nbsp;</span>'
tmplIndentSpace	Template for space char.	'&nbsp;'
autoLineBreak	When rendering line breaks automatically which types should it break on.	'TOK_TYPE_FUNCTION | TOK_TYPE_ARGUMENT | TOK_SUBTYPE_LOGICAL | TOK_TYPE_OP_IN '
newLine	Used for the {{autolinebreak}} replacement as well as some string parsing.	'<br />'
trim	Trim the output.	true
customTokenRender	This is a call back to a custom token function.	Custom function for formatFormulaHTML
prefix	Add a prefix to the formula.	'='
postfix	Add a suffix to the formula.	''

formula2CSharp

Converts an excel formula into C# code.

Signature:
formula2CSharp(formula: string, options): string

• formula - The excel formula to format
• options - An optional object with the following properties (inherits defaults from formatFormula):

Name	Description	Default
tmplFunctionStart	Template for the start of a function, the {{token}} will contain the name of the function.	'{{token}}('
tmplFunctionStop	Template for when the end of a function has been reached.	'{{token}})'
tmplOperandError	Template for errors.	'{{token}}'
tmplOperandRange	Template for ranges and variable names.	'{{token}}'
tmplOperandLogical	Template for logical operators such as + - = ...	'{{token}}'
tmplOperandNumber	Template for numbers.	'{{token}}'
tmplOperandText	Template for text/strings.	'"{{token}}"'
tmplArgument	Template for argument separators such as ,.	'{{token}}'
tmplOperandOperatorInfix	-	'{{token}}'
tmplFunctionStartArray	Template for the start of an array.	''
tmplFunctionStartArrayRow	Template for the start of an array row.	'{'
tmplFunctionStopArrayRow	Template for the end of an array row.	'}'
tmplFunctionStopArray	Template for the end of an array.	''
tmplSubexpressionStart	Template for the sub expression start.	'('
tmplSubexpressionStop	Template for the sub expression stop.	')'
tmplIndentTab	Template for the tab char.	'\t'
tmplIndentSpace	Template for space char.	' '
autoLineBreak	When rendering line breaks automatically which types should it break on.	'TOK_SUBTYPE_STOP | TOK_SUBTYPE_START | TOK_TYPE_ARGUMENT'
trim	Trim the output.	true
customTokenRender	This is a call back to a custom token function.	Custom function for formula2CSharp

formula2JavaScript

Signature: formula2JavaScript(formula: string, options): string

• formula - The excel formula to format
• options - An optional object with the following properties (inherits options from formula2CSharp):

formula2Python

Signature: formula2Python(formula: string, options): string

• formula - The excel formula to format
• options - An optional object with the following properties (inherits defaults from formatFormula):

Name	Description	Default
tmplFunctionStart	Template for the start of a function, the {{token}} will contain the name of the function.	'{{token}}('
tmplFunctionStop	Template for when the end of a function has been reached.	'{{token}})'
tmplOperandError	Template for errors.	'{{token}}'
tmplOperandRange	Template for ranges and variable names.	'{{token}}'
tmplOperandLogical	Template for logical operators such as + - = ...	'{{token}}'
tmplOperandNumber	Template for numbers.	'{{token}}'
tmplOperandText	Template for text/strings.	'"{{token}}"'
tmplArgument	Template for argument separators such as ,.	'{{token}}'
tmplOperandOperatorInfix	-	'{{token}}'
tmplFunctionStartArray	Template for the start of an array.	''
tmplFunctionStartArrayRow	Template for the start of an array row.	'{'
tmplFunctionStopArrayRow	Template for the end of an array row.	'}'
tmplFunctionStopArray	Template for the end of an array.	''
tmplSubexpressionStart	Template for the sub expression start.	'('
tmplSubexpressionStop	Template for the sub expression stop.	')'
tmplIndentTab	Template for the tab char.	'\t'
tmplIndentSpace	Template for space char.	' '
autoLineBreak	When rendering line breaks automatically which types should it break on.	'TOK_SUBTYPE_STOP | TOK_SUBTYPE_START | TOK_TYPE_ARGUMENT'
trim	Trim the output.	true
customTokenRender	This is a call back to a custom token function.	Custom function for formula2CSharp

getTokens

Tokenizes an excel formula.

Signature: getTokens(formula: string isEu: boolean): F_token[]

• formula - The excel formula to format
• isEu - If truethen ; is treated as list separator, if false then ; is treated as array row separator

Returns an array of tokens, e.g. given the formula A1+1000 the output would be:

[
  {
    "subtype": "range",
    "type": "operand",
    "value": "A1"
  },
  {
    "subtype": "math",
    "type": "operator-infix",
    "value": "+"
  },
  {
    "subtype": "number",
    "type": "operand",
    "value": "1000"
  }
]