Add sanitizeInput() and improve normalizeStreet() for edge cases

[Copilot]

Adds a sanitizeInput() function for cleaning raw user input before Nominatim queries, and fixes normalizeStreet() to correctly handle ZIP codes, positional directionals, and address fractions.

New: web/js/sanitize.js

Strips parentheticals, removes query-breaking characters, collapses whitespace — preserves commas (Nominatim separators), hyphens, and slashes:

sanitizeInput('123 Main St. (near park)!') // → '123 Main St near park'

web/js/hazards.js — normalizeStreet() rewrite

• Splits ABBR_MAP into STREET_TYPE_ABBRS + DIRECTIONAL_EXPAND — old flat map expanded E/W/N/S mid-string (e.g. inside "New" or "West"), causing false mismatches
• Strips trailing ZIP codes before expansion ("8 1/2 W Canal St, 23220" → "west canal street")
• Expands directionals only at string prefix/suffix, not mid-token

web/js/app.js

• attachAutocomplete() and run(): replaced .value.trim() with sanitizeInput(inputEl.value)

web/index.html

• Added <script src="js/sanitize.js"></script> as the first script tag so sanitizeInput is available to all subsequent scripts

Original prompt

Implement the string sanitization plan as described in docs/string-sanitization-plan.md. This adds a new sanitizeInput() function and improves normalizeStreet() to handle ZIP codes, positional directionals, and other edge cases.

Changes required

1. Create web/js/sanitize.js (new file)

// sanitize.js — sanitizes raw user input before geocoding or internal matching

/**
 * Sanitizes a raw user-supplied address string for use as a Nominatim query.
 *
 * - Trims leading/trailing whitespace
 * - Collapses multiple spaces into one
 * - Strips parenthetical context (e.g. "(near the park)")
 * - Removes characters that break queries: # " ' . ; : ! ? @ ^ * [ ] { } | \ ~ ` = + < > % & _
 * - Preserves commas (Nominatim field separators), hyphens (address ranges), slashes (fractions)
 * - Does NOT expand abbreviations (leave that to normalizeStreet in hazards.js)
 * - Does NOT strip ZIP codes (Nominatim handles them; strip only inside normalizeStreet)
 * - Must never be called on coordinate (lat/lng) values
 *
 * @param {string} str  Raw input string
 * @returns {string}    Sanitized string safe for Nominatim queries
 */
function sanitizeInput(str) {
  if (typeof str !== 'string') return '';
  let s = str;
  // Remove parenthetical content
  s = s.replace(/\([^)]*\)/g, '');
  // Keep: letters, digits, spaces, commas, hyphens, forward slashes
  s = s.replace(/[^a-zA-Z0-9\s,\-\/]/g, '');
  // Collapse multiple spaces
  s = s.replace(/\s{2,}/g, ' ');
  return s.trim();
}

2. Update web/js/hazards.js

Replace the existing ABBR_MAP constant and normalizeStreet() function with the following improved version that handles ZIP codes and positional directionals:

const STREET_TYPE_ABBRS = [
  [/\bSt\b/g, 'Street'],
  [/\bAve\b/g, 'Avenue'],
  [/\bBlvd\b/g, 'Boulevard'],
  [/\bDr\b/g, 'Drive'],
  [/\bRd\b/g, 'Road'],
  [/\bPkwy\b/g, 'Parkway'],
  [/\bLn\b/g, 'Lane'],
  [/\bCt\b/g, 'Court'],
];

const DIRECTIONAL_EXPAND = {
  W: 'West',
  E: 'East',
  N: 'North',
  S: 'South',
};

function normalizeStreet(str) {
  let s = str;

  // 1. Strip trailing ZIP code (5 digits, optionally preceded by comma and/or space)
  s = s.replace(/[,\s]+\d{5}\s*$/, '');

  // 2. Expand street type abbreviations
  for (const [pattern, replacement] of STREET_TYPE_ABBRS) {
    s = s.replace(pattern, replacement);
  }

  // 3. Expand directionals at start of string (prefix directional)
  s = s.replace(/^(W|E|N|S)\b\s*/, (_, d) => DIRECTIONAL_EXPAND[d] + ' ');

  // 4. Expand directionals at end of string (suffix directional)
  s = s.replace(/\s+(W|E|N|S)$/, (_, d) => ' ' + DIRECTIONAL_EXPAND[d]);

  // 5. Strip leading house numbers (including fractional like "8 1/2")
  s = s.replace(/^\d+(\s+\d+\/\d+)?\s+/, '');

  // 6. Strip remaining punctuation
  s = s.replace(/[^a-zA-Z0-9\s]/g, '');

  // 7. Collapse whitespace and trim, lowercase
  s = s.replace(/\s{2,}/g, ' ');
  return s.trim().toLowerCase();
}

Do NOT change anything else in hazards.js — getAllHazards(), getHazardsOnRoute(), and the coordinate bounding box logic from the previous PR are all unchanged.

3. Update web/js/app.js

In attachAutocomplete(): Replace inputEl.value.trim() with sanitizeInput(inputEl.value):

// Before:
const query = inputEl.value.trim();

// After:
const query = sanitizeInput(inputEl.value);

In run(): Replace the two .value.trim() calls with sanitizeInput():

// Before:
const origin = document.getElementById('origin').value.trim();
const destination = document.getElementById('destination').value.trim();

// After:
const origin = sanitizeInput(document.getElementById('origin').value);
const destination = sanitizeInput(document.getElementById('destination').value);

4. Update web/index.html

Add <script src="js/sanitize.js"></script> as the first script tag, before geocode.js:

<!-- Before: -->
<script src="js/geocode.js"></script>

<!-- After: -->
<script src="js/sanitize.js"></script>
<script src="js/geocode.js"></script>

5. Update web/js/geocode.js

Add Richmond bounding box to the Nominatim search URL (this was identified as a bug in a previous session — geocodeAddress currently has no bounding box, so addresses can resolve outside Richmond):

// Before:
const url = `https://nominatim.openstreetmap.org/search?format=json&q=${encodeURIComponent(address)}`;

// After:
const url = `https://nominatim.openstreetmap.org/search?format=json&bounded=1&viewbox=-77.6,37.7,-77.2,37.4&countrycodes=us&q=${encodeURIComponent(address)}`;

Also add countrycodes=us to the autocomplete URL in web/js/app.js (line with viewbox=-77.6,37.7,-77.2,37.4):

// Before:
const url = `https://nominatim.openstreetmap.org/search?format=json&addressdetails=0&limit=5&bounded=1&viewbox=-77.6,37.7,-77.2,37.4&q=${encodeURIComponent(query)}`;

// After:
const url = `https://nominatim.openstreetmap.org/search?format=json&addressdetails=0&limit=5&bound...

</details>



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