68 lines
2.1 KiB
Go
68 lines
2.1 KiB
Go
package eol
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import (
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"sourcecode.social/reiver/go-opt"
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)
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// internalCircumstance is primarily used to help to create informative error messages.
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//
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// internalCircumstance contains the end-of-line sequence and the character-number within that end-of-line sequence.
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//
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// Example end-of-line sequences are:
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//
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// • "\n"
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// • "\r"
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// • "\r\n"
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// • "\u0085"
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// • "\u2028"
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//
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// No end-of-line sequence can also be specified if it is unknown.
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// For example eol.ReadEOL() does NOT know the end-of-line sequence ahead of time.
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//
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// The character-number is 1-indexed.
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// Meaning that the 1st character is 1 (and not 0).
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//
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// Creating an internalCircumstance usually looks something like these:
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//
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// var circumstance internalCircumstance = specifyCircumstance(opt.Nothing[string](), 1)
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//
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// var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\n"), 1)
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//
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// var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\r"), 1)
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//
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// var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\r\n"), 1)
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//
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// var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\r\n"), 2)
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//
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// var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\u0085"), 1)
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//
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// var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\u2028"), 1)
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//
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// These would then be passed to some type of error.
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// For example:
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//
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// var err error = errNotFound(circumstance, expected, actual)
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//
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// var err error = errProblemReadingRune(circumstance, err)
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//
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// var err error = errProblemUnreadingRune(circumstance, err, r)
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type internalCircumstance struct {
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eolSequence opt.Optional[string]
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characterNumber uint64
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}
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func specifyCircumstance(eolSequence opt.Optional[string], characterNumber uint64) internalCircumstance {
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return internalCircumstance{
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eolSequence:eolSequence,
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characterNumber:characterNumber,
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}
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}
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func (receiver internalCircumstance) CharacterNumber() uint64 {
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return receiver.characterNumber
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}
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func (receiver internalCircumstance) EOLSequence() opt.Optional[string] {
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return receiver.eolSequence
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}
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