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import { A_START_CHAR, B_START_CHAR, C_START_CHAR, A_CHARS, B_CHARS, C_CHARS } from './constants'; |
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// Match Set functions |
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const matchSetALength = (string) => string.match(new RegExp(`^${A_CHARS}*`))[0].length; |
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const matchSetBLength = (string) => string.match(new RegExp(`^${B_CHARS}*`))[0].length; |
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const matchSetC = (string) => string.match(new RegExp(`^${C_CHARS}*`))[0]; |
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// CODE128A or CODE128B |
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function autoSelectFromAB(string, isA){ |
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const ranges = isA ? A_CHARS : B_CHARS; |
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const untilC = string.match(new RegExp(`^(${ranges}+?)(([0-9]{2}){2,})([^0-9]|$)`)); |
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if (untilC) return ( |
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untilC[1] + |
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String.fromCharCode(204) + |
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autoSelectFromC(string.substring(untilC[1].length)) |
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); |
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const chars = string.match(new RegExp(`^${ranges}+`))[0]; |
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if (chars.length === string.length) return string; |
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return ( |
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chars + |
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String.fromCharCode(isA ? 205 : 206) + |
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autoSelectFromAB(string.substring(chars.length), !isA) |
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); |
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} |
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// CODE128C |
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function autoSelectFromC(string) { |
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const cMatch = matchSetC(string); |
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const length = cMatch.length; |
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if (length === string.length) return string; |
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string = string.substring(length); |
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// Select A/B depending on the longest match |
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const isA = matchSetALength(string) >= matchSetBLength(string); |
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return cMatch + String.fromCharCode(isA ? 206 : 205) + autoSelectFromAB(string, isA); |
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} |
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// Detect Code Set (A, B or C) and format the string |
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export default (string) => { |
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let newString; |
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const cLength = matchSetC(string).length; |
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// Select 128C if the string start with enough digits |
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if (cLength >= 2) { |
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newString = C_START_CHAR + autoSelectFromC(string); |
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} else { |
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// Select A/B depending on the longest match |
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const isA = matchSetALength(string) > matchSetBLength(string); |
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newString = (isA ? A_START_CHAR : B_START_CHAR) + autoSelectFromAB(string, isA); |
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} |
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return newString.replace( |
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/[\xCD\xCE]([^])[\xCD\xCE]/, // Any sequence between 205 and 206 characters |
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(match, char) => String.fromCharCode(203) + char |
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); |
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}; |
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Consider adding curly braces around all statements when they are executed conditionally. This is optional if there is only one statement, but leaving them out can lead to unexpected behaviour if another statement is added later.
Consider:
If you or someone else later decides to put another statement in, only the first statement will be executed.
In this case the statement
b = 42
will always be executed, while the logging statement will be executed conditionally.ensures that the proper code will be executed conditionally no matter how many statements are added or removed.