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50 lines
2.3 KiB
JavaScript
50 lines
2.3 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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// Explicit travel/intercardinal forms — safe on free-form text (a street
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// name almost never contains "NORTHBOUND" or a lone "NB" token).
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if (/\bNORTHBOUND\b|\bNB\b/.test(text)) return 0;
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if (/\bSOUTHBOUND\b|\bSB\b/.test(text)) return 180;
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if (/\bEASTBOUND\b|\bEB\b/.test(text)) return 90;
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if (/\bWESTBOUND\b|\bWB\b/.test(text)) return 270;
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if (/\bNORTHEAST\b|\bNE\b/.test(text)) return 45;
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if (/\bNORTHWEST\b|\bNW\b/.test(text)) return 315;
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if (/\bSOUTHEAST\b|\bSE\b/.test(text)) return 135;
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if (/\bSOUTHWEST\b|\bSW\b/.test(text)) return 225;
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// Bare cardinals — dedicated direction fields only.
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if (allowBare) {
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if (/\bNORTH\b/.test(text)) return 0;
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if (/\bSOUTH\b/.test(text)) return 180;
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if (/\bEAST\b/.test(text)) return 90;
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if (/\bWEST\b/.test(text)) return 270;
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}
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return NaN;
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}
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