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Unicode Variation Selector Code Point Tag Tool

Compute unicode variation selector code point tag from explicit bounded inputs.

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Description

Classify a valid scalar within U+FE00–FE0F or U+E0100–E01EF and return selector, supplementary, and ordinal one through 256 across those ranges; use ordinal zero otherwise.

Text positions can be measured in UTF-16 code units, Unicode code points, grapheme clusters, or modeled display columns. These coordinates are not interchangeable. Invisible markers and delimiter policies can also affect interpretation even when a string looks unchanged, so the chosen representation needs to stay explicit.

Classify a valid scalar within U+FE00–FE0F or U+E0100–E01EF and return selector, supplementary, and ordinal one through 256 across those ranges; use ordinal zero otherwise.

When to use this tool

Use Unicode Variation Selector Code Point Tag when you need the stated marker, coordinate, delimiter, or normalization operation under an explicit text representation.

How to use the tool and how it works

  1. Enter point. Use the units and conventions below.
  2. Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
  3. Read selector, supplementary, ordinal. Inspect selector, supplementary before interpreting the associated values.

Classify a valid scalar within U+FE00–FE0F or U+E0100–E01EF and return selector, supplementary, and ordinal one through 256 across those ranges; use ordinal zero otherwise.1

Input fieldMeaning and unitsAccepted input
pointPointRequired. Safe integer.
Output fieldInterpretationReturned shape
selectorSelectorRequired. Boolean.
supplementarySupplementaryRequired. Boolean.
ordinalSelector number one through 256 for the supported ranges; zero when not recognized.Required. Safe integer.
json
{
  "input": {
    "point": 65039
  },
  "output": {
    "selector": true,
    "supplementary": false,
    "ordinal": 16
  }
}

Limitations and assumptions

  • This range lookup excludes Mongolian free variation selectors. It does not validate a base/selector pairing, registry assignment, or rendered appearance.
  • The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.

Alternative or Complementary methods

Choose the coordinate system required by the consumer. Use a full parser, renderer, or segmentation method when a local marker or delimiter rule cannot determine the complete text behavior.

References

  1. Calculation and input contract: text/unicode-variation-selector-code-point-tag — tool.io

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