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Rudy CelekliandClaude Sonnet 5.5
0555d99ea4
Rebased onto current main with review follow-ups folded in. Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
62 lines
2.2 KiB
JavaScript
62 lines
2.2 KiB
JavaScript
/**
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* Convert a cardinal/intercardinal direction string to a compass heading.
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*
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* Two matching modes, because the same text is parsed from two very different
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* kinds of source field:
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*
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* 1. Dedicated direction fields (Caltrans `location.direction`, Austin
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* `travel_direction`/`facing`, …) hold a real facing value. There, bare
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* cardinal words ("West", "North") ARE the answer — pass `allowBare=true`.
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*
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* 2. Free-form name/description text ("5TH ST / WEST AVE", "N LAMAR BLVD") is
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* full of STREET names that merely contain a cardinal word. Reading a bare
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* "West" there as a facing direction mis-orients the camera with false
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* confidence (59 of ~1000 Austin cameras hit this — owner adversarial review
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* 2026-07-04). There, only explicit travel forms ("WESTBOUND"/"WB") count —
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* leave `allowBare=false` (the default).
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*
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* Recognizes full travel words ("NORTHBOUND"), abbreviations ("NB"), and —
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* only when `allowBare` is set — bare cardinals ("NORTH").
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*
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* @param {string} value - Direction text (case-insensitive).
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* @param {boolean} [allowBare=false] - Match bare cardinal words. Use ONLY for
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* dedicated direction fields, never for free-form name inference.
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* @returns {number} Heading in degrees [0..360), or NaN if unrecognized.
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*/
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export function directionToHeading(value, allowBare = false) {
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const text = String(value || '')
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.trim()
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.toUpperCase();
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if (!text) return NaN;
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const tiers = [
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[
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[/\bNORTHBOUND\b|\bNB\b/, 0],
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[/\bSOUTHBOUND\b|\bSB\b/, 180],
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[/\bEASTBOUND\b|\bEB\b/, 90],
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[/\bWESTBOUND\b|\bWB\b/, 270],
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],
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[
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[/\bNORTHEAST\b|\bNE\b/, 45],
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[/\bNORTHWEST\b|\bNW\b/, 315],
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[/\bSOUTHEAST\b|\bSE\b/, 135],
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[/\bSOUTHWEST\b|\bSW\b/, 225],
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],
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];
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if (allowBare)
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tiers.push([
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[/\bNORTH\b/, 0],
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[/\bSOUTH\b/, 180],
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[/\bEAST\b/, 90],
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[/\bWEST\b/, 270],
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]);
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for (const forms of tiers) {
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const headings = new Set();
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for (const [pattern, heading] of forms) {
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if (pattern.test(text)) headings.add(heading);
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}
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if (headings.size)
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return headings.size === 1 ? headings.values().next().value : NaN;
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}
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return NaN;
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}
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