From b0f00c68a082e9b06fe01cfca0a49f89e77d9cb0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matt=C3=A9o=20Delabre?= <contact@matteodelabre.me>
Date: Tue, 3 Dec 2019 17:00:21 -0500
Subject: [PATCH] =?UTF-8?q?app:=20Autocompl=C3=A9tion=20&=20r=C3=A9=C3=A9c?=
 =?UTF-8?q?riture=20moteur=20de=20recherche?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/.eslintrc.json                 |  42 ++
 app/src/App.js                     |  17 -
 app/src/SearchResults.js           |  41 --
 app/src/TermInput.js               |  63 ---
 app/src/components/App.js          |  29 ++
 app/src/components/DiseaseGraph.js |  37 ++
 app/src/{ => components}/Graph.js  |   1 -
 app/src/components/TermInput.js    | 193 ++++++++
 app/src/data/mock.js               | 170 +++++++
 app/src/fetch.js                   | 330 +++++--------
 app/src/index.js                   |   2 +-
 app/src/util.js                    |  26 ++
 app/style/style.css                |  30 +-
 package-lock.json                  | 727 ++++++++++++++++++++++++-----
 package.json                       |   3 +
 15 files changed, 1253 insertions(+), 458 deletions(-)
 create mode 100644 app/.eslintrc.json
 delete mode 100644 app/src/App.js
 delete mode 100644 app/src/SearchResults.js
 delete mode 100644 app/src/TermInput.js
 create mode 100644 app/src/components/App.js
 create mode 100644 app/src/components/DiseaseGraph.js
 rename app/src/{ => components}/Graph.js (99%)
 create mode 100644 app/src/components/TermInput.js
 create mode 100644 app/src/data/mock.js
 create mode 100644 app/src/util.js

diff --git a/app/.eslintrc.json b/app/.eslintrc.json
new file mode 100644
index 0000000..7a6e58e
--- /dev/null
+++ b/app/.eslintrc.json
@@ -0,0 +1,42 @@
+{
+    "env": {
+        "browser": true,
+        "es6": true
+    },
+    "extends": [
+        "eslint:recommended",
+        "plugin:react/recommended"
+    ],
+    "globals": {
+        "Atomics": "readonly",
+        "SharedArrayBuffer": "readonly"
+    },
+    "parserOptions": {
+        "ecmaFeatures": {
+            "jsx": true
+        },
+        "ecmaVersion": 2018,
+        "sourceType": "module"
+    },
+    "plugins": [
+        "react"
+    ],
+    "rules": {
+        "indent": [
+            "error",
+            4
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "quotes": [
+            "error",
+            "single"
+        ],
+        "semi": [
+            "error",
+            "always"
+        ]
+    }
+}
\ No newline at end of file
diff --git a/app/src/App.js b/app/src/App.js
deleted file mode 100644
index 23f74f7..0000000
--- a/app/src/App.js
+++ /dev/null
@@ -1,17 +0,0 @@
-import React, {useState} from 'react';
-import TermInput from './TermInput.js';
-import SearchResults from './SearchResults.js';
-
-const App = () =>
-{
-    const [terms, setTerms] = useState([]);
-
-    return (
-        <div className="App">
-            <TermInput terms={terms} setTerms={setTerms} />
-            <SearchResults terms={terms} />
-        </div>
-    );
-};
-
-export default App;
diff --git a/app/src/SearchResults.js b/app/src/SearchResults.js
deleted file mode 100644
index 8728f68..0000000
--- a/app/src/SearchResults.js
+++ /dev/null
@@ -1,41 +0,0 @@
-import React, {useState, useEffect} from 'react';
-import Graph from './Graph.js';
-import {searchTerms} from './fetch.js';
-
-const useResults = terms =>
-{
-    const [results, setResults] = useState({
-        nodes: {},
-        edges: []
-    });
-
-    useEffect(() =>
-    {
-        const fetch = async () =>
-        {
-            setResults(await searchTerms(terms));
-        };
-
-        fetch();
-    }, [terms]);
-
-    return results;
-};
-
-const SearchResults = ({terms}) =>
-{
-    const {nodes, edges} = useResults(terms);
-    return (
-        <Graph
-            nodes={Object.keys(nodes)}
-            edges={edges}
-            render={id => <span className={[
-                'SearchResults_result',
-                terms.includes(nodes[id].name) ? 'SearchResults_result-term' : '',
-                nodes[id].types.includes('Maladie') ? 'SearchResults_result-disease' : '',
-            ].join(' ')}>{nodes[id].name}</span>}
-        />
-    );
-};
-
-export default SearchResults;
diff --git a/app/src/TermInput.js b/app/src/TermInput.js
deleted file mode 100644
index 63fe283..0000000
--- a/app/src/TermInput.js
+++ /dev/null
@@ -1,63 +0,0 @@
-import React, {useState} from 'react';
-
-const enterKey = 13;
-const backspaceKey = 8;
-
-const TermInput = ({terms, setTerms}) =>
-{
-    const [value, setValue] = useState('');
-
-    const handleKeyDown = ev =>
-    {
-        if (ev.keyCode === enterKey && value)
-        {
-            ev.preventDefault();
-
-            if (!terms.includes(value))
-            {
-                setTerms(terms.concat([value]));
-            }
-
-            setValue('');
-            return;
-        }
-
-        if (ev.keyCode === backspaceKey && !value)
-        {
-            ev.preventDefault();
-            setTerms(terms.slice(0, -1));
-            return;
-        }
-    };
-
-    const handleChange = ev =>
-    {
-        setValue(ev.target.value);
-    };
-
-    const handleRemove = removedTerm =>
-    {
-        console.log(removedTerm);
-        console.log(terms);
-        setTerms(terms.filter(term => term !== removedTerm));
-    };
-
-    return (
-        <div className="TermInput">
-            {terms.map(term => 
-                <span
-                    key={term}
-                    className="TermInput_term"
-                    onClick={handleRemove.bind(null, term)}
-                >{term}</span>
-            )}
-            <input
-                autoFocus={true} type="text" className="TermInput_input"
-                placeholder="Rechercher un symptôme, un signe ou une maladie…"
-                value={value}
-                onChange={handleChange} onKeyDown={handleKeyDown} />
-        </div>
-    );
-}
-
-export default TermInput;
diff --git a/app/src/components/App.js b/app/src/components/App.js
new file mode 100644
index 0000000..b181659
--- /dev/null
+++ b/app/src/components/App.js
@@ -0,0 +1,29 @@
+import React, {useState} from 'react';
+import TermInput from './TermInput.js';
+import DiseaseGraph from './DiseaseGraph.js';
+import {useAsync} from '../util.js';
+import {
+    diseasesBySymptoms,
+    exploreSymptoms
+} from '../fetch.js';
+
+const App = () =>
+{
+    const [terms, setTerms] = useState([]);
+
+    const diseases = useAsync([], diseasesBySymptoms, terms);
+    const results = useAsync([], exploreSymptoms, diseases);
+
+    return (
+        <div className="App">
+            <TermInput
+                terms={terms}
+                availableTerms={results}
+                setTerms={setTerms}
+            />
+            <DiseaseGraph terms={terms} results={results} />
+        </div>
+    );
+};
+
+export default App;
diff --git a/app/src/components/DiseaseGraph.js b/app/src/components/DiseaseGraph.js
new file mode 100644
index 0000000..d7baf4b
--- /dev/null
+++ b/app/src/components/DiseaseGraph.js
@@ -0,0 +1,37 @@
+import React from 'react';
+import Graph from './Graph.js';
+import {types} from '../data/mock.js';
+import {useAsync} from '../util.js';
+import {symptomsSubgraph} from '../fetch.js';
+
+const DiseaseGraph = ({terms, results}) =>
+{
+    const {nodes, edges} = useAsync({
+        nodes: {},
+        edges: []
+    }, symptomsSubgraph, results);
+
+    const render = id =>
+    {
+        const isTerm = terms.some(({id: termId}) => termId === id);
+        const isDisease = nodes[id].types.includes(types.disease);
+
+        return (
+            <span className={[
+                'SearchResults_result',
+                isTerm ? 'SearchResults_result-term' : '',
+                isDisease ? 'SearchResults_result-disease' : '',
+            ].join(' ')}>{nodes[id].name}</span>
+        );
+    };
+
+    return (
+        <Graph
+            nodes={Object.keys(nodes)}
+            edges={edges}
+            render={render}
+        />
+    );
+};
+
+export default DiseaseGraph;
diff --git a/app/src/Graph.js b/app/src/components/Graph.js
similarity index 99%
rename from app/src/Graph.js
rename to app/src/components/Graph.js
index 00b0abc..bcb5a76 100644
--- a/app/src/Graph.js
+++ b/app/src/components/Graph.js
@@ -153,7 +153,6 @@ const Graph = ({nodes, edges, render}) =>
     // Rendu de l’animation du graphe
     useEffect(() =>
     {
-
         const center = () => new Springy.Vector(
             window.innerWidth / 2,
             window.innerHeight / 2
diff --git a/app/src/components/TermInput.js b/app/src/components/TermInput.js
new file mode 100644
index 0000000..125bd81
--- /dev/null
+++ b/app/src/components/TermInput.js
@@ -0,0 +1,193 @@
+import React, {useState, useRef} from 'react';
+import * as fetch from '../fetch.js';
+
+/**
+ * Codes des touches du clavier par nom.
+ */
+const keys = Object.assign(Object.create(null), {
+    'backspace': 8,
+    'enter': 13,
+    'left': 37,
+    'up': 38,
+    'right': 39,
+    'down': 40,
+});
+
+/**
+ * Zone de saisie des termes de recherche.
+ *
+ * @prop terms Ensemble de termes déjà validés.
+ * @param availableTerms Termes pouvant être ajoutés par l’utilisateur.
+ * @prop setTerms Fonction de rappel utilisée pour modifier l’ensemble des
+ * termes validés par l’utilisateur.
+ */
+const TermInput = ({terms, availableTerms, setTerms}) =>
+{
+    // Valeur actuellement saisie dans le champ de recherche de termes
+    const [value, setValue] = useState('');
+
+    // Liste des termes suggérés par autocomplétion
+    const [suggestions, setSuggestions] = useState([]);
+
+    // Terme ayant le focus parmi les suggestions
+    const [focusedSuggestion, setFocusedSuggestion] = useState(0);
+
+    // Référence au champ de saisie
+    const inputRef = useRef(null);
+
+    /**
+     * Ajoute un terme à l’ensemble des termes sélectionnés.
+     *
+     * @param term Terme à ajouter.
+     */
+    const addTerm = term =>
+    {
+        if (terms.some(({id}) => id === term.id))
+        {
+            // N’ajoute pas les termes déjà sélectionnés
+            return;
+        }
+
+        setTerms(terms.concat([term]));
+        setValue('');
+        setSuggestions([]);
+        setFocusedSuggestion(0);
+
+        if (inputRef.current !== null)
+        {
+            inputRef.current.focus();
+        }
+    };
+
+    /**
+     * Supprime un terme des termes sélectionnés.
+     *
+     * @param index Indice du terme à supprimer dans la liste.
+     */
+    const removeTerm = index =>
+    {
+        setTerms([
+            ...terms.slice(0, index),
+            ...terms.slice(index + 1)
+        ]);
+    };
+
+    /**
+     * Gère l’appui sur une touche dans le champ de saisie.
+     *
+     * @param ev Informations sur l’événement d’appui.
+     */
+    const handleInputKeyDown = ev =>
+    {
+        if (ev.keyCode === keys.enter && value)
+        {
+            // Touche Entrée : ajout de la suggestion ayant le focus
+            ev.preventDefault();
+
+            if (focusedSuggestion < suggestions.length)
+            {
+                addTerm(suggestions[focusedSuggestion]);
+            }
+        }
+        else if (
+            ev.keyCode === keys.backspace
+            && !value
+            && terms.length !== 0
+        )
+        {
+            // Touche Retour alors que le champ de saisie est vide :
+            // retrait du dernier terme
+            ev.preventDefault();
+            setTerms(terms.slice(0, -1));
+        }
+        else if (ev.keyCode === keys.up && focusedSuggestion > 0)
+        {
+            // Touche Haut : focus de la suggestion précédente
+            ev.preventDefault();
+            setFocusedSuggestion(focusedSuggestion - 1);
+        }
+        else if (
+            ev.keyCode === keys.down
+            && focusedSuggestion < suggestions.length - 1
+        )
+        {
+            // Touche Bas : focus de la suggestion suivante
+            ev.preventDefault();
+            setFocusedSuggestion(focusedSuggestion + 1);
+        }
+    };
+
+    /**
+     * Gère la modification du contenu du champ de saisie.
+     *
+     * @param ev Informations sur l’événement de modification.
+     */
+    const handleInputChange = ev =>
+    {
+        const nextValue = ev.target.value;
+        setValue(nextValue);
+
+        if (nextValue.length === 0)
+        {
+            // On ne fait pas de suggestion si la valeur saisie est trop courte
+            setSuggestions([]);
+        }
+        else
+        {
+            setSuggestions(availableTerms
+                // Sélectionne les termes qui n’ont pas déjà été choisis
+                .filter(({id: suggestionId}) =>
+                    !terms.some(({id: termId}) =>
+                        termId === suggestionId
+                    )
+                )
+                // Filtre ceux dont le nom correspond à la saisie
+                .filter(({name}) =>
+                    name.toLowerCase().startsWith(nextValue.toLowerCase())
+                )
+            );
+        }
+    };
+
+    return (
+        <div className="TermInput">
+            {terms.map((term, index) => 
+                <span
+                    key={term.id}
+                    className="TermInput_term"
+                    onClick={removeTerm.bind(null, index)}
+                >
+                    {term.name}
+                </span>
+            )}
+
+            <input
+                autoFocus={true}
+                type="text" className="TermInput_input"
+                placeholder="Rechercher un symptôme, un signe ou une maladie…"
+                value={value} ref={inputRef}
+                onChange={handleInputChange}
+                onKeyDown={handleInputKeyDown} />
+
+            <ul className="TermInput_suggestions">
+                {suggestions.map((suggestion, index) =>
+                    <li
+                        key={suggestion.id}
+                        className={[
+                            'TermInput_suggestion',
+                            index === focusedSuggestion
+                                ? 'TermInput_suggestion-focus'
+                                : ''
+                        ].join(' ')}
+                        onMouseEnter={setFocusedSuggestion.bind(null, index)}
+                        onClick={addTerm.bind(null, suggestion)}
+                    >
+                        {suggestion.name}
+                    </li>
+                )}
+            </ul>
+        </div>
+    );
+}
+
+export default TermInput;
diff --git a/app/src/data/mock.js b/app/src/data/mock.js
new file mode 100644
index 0000000..2a4a984
--- /dev/null
+++ b/app/src/data/mock.js
@@ -0,0 +1,170 @@
+/**
+ * Types de termes de la base.
+ */
+export const types = {
+    disease: 'Maladie',
+    symptom: 'Symptôme',
+    sign: 'Signe'
+};
+
+/**
+ * Liste des termes de la base de données, contenant des maladies, des signes
+ * et des symptômes.
+ */
+export const terms = {
+    Q2840: {
+        id: 'Q2840',
+        name: 'Grippe',
+        types: [types.disease],
+        weight: 0.000035
+    },
+    Q154882: {
+        id: 'Q154882',
+        name: 'Légionellose',
+        types: [types.disease],
+        weight: 0.000015
+    },
+    Q155098: {
+        id: 'Q155098',
+        name: 'Leptospirose',
+        types: [types.disease],
+        weight: 0.00001
+    },
+    Q326663: {
+        id: 'Q326663',
+        name: 'Encéphalite à tiques',
+        types: [types.disease],
+        weight: 0.000001
+    },
+    Q133780: {
+        id: 'Q133780',
+        name: 'Peste',
+        types: [types.disease],
+        weight: 0.000032
+    },
+    Q38933: {
+        id: 'Q38933',
+        name: 'Fièvre',
+        types: [types.symptom]
+    },
+    Q474959: {
+        id: 'Q474959',
+        name: 'Myalgie',
+        types: [types.symptom]
+    },
+    Q86: {
+        id: 'Q86',
+        name: 'Céphalée',
+        types: [types.sign]
+    },
+    Q1115038: {
+        id: 'Q1115038',
+        name: 'Rhinorrhée',
+        types: [types.symptom]
+    },
+    Q9690: {
+        id: 'Q9690',
+        name: 'Fatigue',
+        types: [types.symptom]
+    },
+    Q127076: {
+        id: 'Q127076',
+        name: 'Vomissement',
+        types: [types.symptom, types.sign]
+    },
+    Q178061: {
+        id: 'Q178061',
+        name: 'Choc circulatoire',
+        types: [types.disease],
+        weight: 0.000038
+    },
+    Q35805: {
+        id: 'Q35805',
+        name: 'Toux',
+        types: [types.symptom, types.sign]
+    },
+    Q647099: {
+        id: 'Q647099',
+        name: 'Hémoptysie',
+        types: [types.symptom]
+    },
+    Q653197: {
+        id: 'Q653197',
+        name: 'Rash',
+        types: [types.symptom, types.sign]
+    },
+    Q160796: {
+        id: 'Q160796',
+        name: 'Syndrome confusionnel',
+        types: [types.disease],
+        weight: 0.000004
+    },
+    Q186235: {
+        id: 'Q186235',
+        name: 'Myocardite',
+        types: [types.disease],
+        weight: 0.0000075
+    },
+    Q476921: {
+        id: 'Q476921',
+        name: 'Insuffisance rénale',
+        types: [types.disease],
+        weight: 0.0000046
+    },
+    Q281289: {
+        id: 'Q281289',
+        name: 'Photophobie',
+        types: [types.sign]
+    },
+    Q159557: {
+        id: 'Q159557',
+        name: 'Coma',
+        types: [types.sign]
+    }
+};
+
+/**
+ * Liste des relations de type « a pour symptôme » entre deux termes.
+ */
+export const hasSymptom = [
+    ['Q2840', 'Q38933'],
+    ['Q2840', 'Q1115038'],
+    ['Q2840', 'Q474959'],
+    ['Q2840', 'Q86'],
+    ['Q2840', 'Q9690'],
+
+    ['Q154882', 'Q86'],
+    ['Q154882', 'Q38933'],
+    ['Q154882', 'Q35805'],
+    ['Q154882', 'Q474959'],
+
+    ['Q155098', 'Q38933'],
+    ['Q155098', 'Q474959'],
+    ['Q155098', 'Q86'],
+    ['Q155098', 'Q476921'],
+    ['Q155098', 'Q186235'],
+    ['Q155098', 'Q653197'],
+
+    ['Q326663', 'Q86'],
+    ['Q326663', 'Q474959'],
+    ['Q326663', 'Q38933'],
+    ['Q326663', 'Q9690'],
+    ['Q326663', 'Q281289'],
+    ['Q326663', 'Q159557'],
+    ['Q326663', 'Q127076'],
+
+    ['Q133780', 'Q38933'],
+    ['Q133780', 'Q86'],
+    ['Q133780', 'Q127076'],
+    ['Q133780', 'Q474959'],
+    ['Q133780', 'Q178061'],
+    ['Q133780', 'Q35805'],
+    ['Q133780', 'Q647099'],
+    ['Q133780', 'Q653197'],
+    ['Q133780', 'Q160796']
+];
+
+/**
+ * Liste des relations de type « est un symptôme de » entre deux termes.
+ */
+export const symptomOf = hasSymptom.map(([from, to]) => [to, from]);
diff --git a/app/src/fetch.js b/app/src/fetch.js
index 9db8dff..2bf1ea9 100644
--- a/app/src/fetch.js
+++ b/app/src/fetch.js
@@ -1,230 +1,138 @@
-const mockNodes = {
-    Q2840: {
-        id: 'Q2840',
-        name: 'Grippe',
-        types: ['Maladie'],
-        weight: 0.000035
-    },
-    Q154882: {
-        id: 'Q154882',
-        name: 'Légionellose',
-        types: ['Maladie'],
-        weight: 0.000015
-    },
-    Q155098: {
-        id: 'Q155098',
-        name: 'Leptospirose',
-        types: ['Maladie'],
-        weight: 0.00001
-    },
-    Q326663: {
-        id: 'Q326663',
-        name: 'Encéphalite à tiques',
-        types: ['Maladie'],
-        weight: 0.000001
-    },
-    Q133780: {
-        id: 'Q133780',
-        name: 'Peste',
-        types: ['Maladie'],
-        weight: 0.000032
-    },
-    Q38933: {
-        id: 'Q38933',
-        name: 'Fièvre',
-        types: ['Symptôme']
-    },
-    Q474959: {
-        id: 'Q474959',
-        name: 'Myalgie',
-        types: ['Symptôme']
-    },
-    Q86: {
-        id: 'Q86',
-        name: 'Céphalée',
-        types: ['Signe']
-    },
-    Q1115038: {
-        id: 'Q1115038',
-        name: 'Rhinorrhée',
-        types: ['Symptôme']
-    },
-    Q9690: {
-        id: 'Q9690',
-        name: 'Fatigue',
-        types: ['Symptôme']
-    },
-    Q127076: {
-        id: 'Q127076',
-        name: 'Vomissement',
-        types: ['Symptôme', 'Signe']
-    },
-    Q178061: {
-        id: 'Q178061',
-        name: 'Choc circulatoire',
-        types: ['Maladie'],
-        weight: 0.000038
-    },
-    Q35805: {
-        id: 'Q35805',
-        name: 'Toux',
-        types: ['Symptôme', 'Signe']
-    },
-    Q647099: {
-        id: 'Q647099',
-        name: 'Hémoptysie',
-        types: ['Symptôme']
-    },
-    Q653197: {
-        id: 'Q653197',
-        name: 'Rash',
-        types: ['Symptôme', 'Signe']
-    },
-    Q160796: {
-        id: 'Q160796',
-        name: 'Syndrome confusionnel',
-        types: ['Maladie'],
-        weight: 0.000004
-    },
-    Q186235: {
-        id: 'Q186235',
-        name: 'Myocardite',
-        types: ['Maladie'],
-        weight: 0.0000075
-    },
-    Q476921: {
-        id: 'Q476921',
-        name: 'Insuffisance rénale',
-        types: ['Maladie'],
-        weight: 0.0000046
-    },
-    Q281289: {
-        id: 'Q281289',
-        name: 'Photophobie',
-        types: ['Signe']
-    },
-    Q159557: {
-        id: 'Q159557',
-        name: 'Coma',
-        types: ['Signe']
-    }
-};
-
-const mockEdges = [
-    ['Q2840', 'Q38933'],
-    ['Q2840', 'Q1115038'],
-    ['Q2840', 'Q474959'],
-    ['Q2840', 'Q86'],
-    ['Q2840', 'Q9690'],
-
-    ['Q154882', 'Q86'],
-    ['Q154882', 'Q38933'],
-    ['Q154882', 'Q35805'],
-    ['Q154882', 'Q474959'],
-
-    ['Q155098', 'Q38933'],
-    ['Q155098', 'Q474959'],
-    ['Q155098', 'Q86'],
-    ['Q155098', 'Q476921'],
-    ['Q155098', 'Q186235'],
-    ['Q155098', 'Q653197'],
-
-    ['Q326663', 'Q86'],
-    ['Q326663', 'Q474959'],
-    ['Q326663', 'Q38933'],
-    ['Q326663', 'Q9690'],
-    ['Q326663', 'Q281289'],
-    ['Q326663', 'Q159557'],
-    ['Q326663', 'Q127076'],
-
-    ['Q133780', 'Q38933'],
-    ['Q133780', 'Q86'],
-    ['Q133780', 'Q127076'],
-    ['Q133780', 'Q474959'],
-    ['Q133780', 'Q178061'],
-    ['Q133780', 'Q35805'],
-    ['Q133780', 'Q647099'],
-    ['Q133780', 'Q653197'],
-    ['Q133780', 'Q160796']
-];
+import * as mock from './data/mock.js';
 
 /**
- * Vérifie si une liste d’arêtes contient une arête donnée, dans un sens ou
- * dans l’autre.
+ * Recherche l’ensemble des maladies liées par une relation « a pour symptôme »
+ * avec un ensemble de termes donné.
  *
- * @param list Liste d’arêtes.
- * @param from Premier nœud de l’arête.
- * @param to Second nœud de l’arête.
- * @return Vrai si et seulement si l’arête existe.
+ * @param query Ensemble de termes attendus.
+ * @return Liste des maladies correspondantes.
  */
-const includesEdge = (list, from, to) =>
-    list.some(([source, target]) => (
-        (source === from && target === to)
-        || (source === to && target === from)
-    ));
-
-export const searchTerms = terms => new Promise((res, rej) =>
+export const diseasesBySymptoms = async query =>
 {
-    // Fait attendre artificiellement pour simuler une requête
-    setTimeout(() =>
+    // Si aucun terme dans la requête, toutes les maladies correspondent
+    if (!query.length)
     {
-        const nodes = {};
-        const edges = [];
+        return Object.values(mock.terms);
+    }
 
-        // Récupération des identifiants correspondant aux termes de la requête
-        const termIds = terms.map(term =>
-            Object.keys(mockNodes)
-                .find(id => mockNodes[id].name === term)
-        );
+    // Marqueurs indiquant pour chaque terme l’ensemble des éléments de la
+    // requête qu’il a pour symptôme au travers d’une relation directe ou
+    // transitive
+    const matchingSymptoms = {};
 
-        // Si l’un des termes est inconnu, aucun résultat
-        if (!termIds.includes(undefined))
+    // Réalise un parcours en profondeur du graphe en partant de chaque terme
+    // de la requête pour marquer les résultats
+    for (let queryTerm of query)
+    {
+        const stack = [queryTerm.id];
+
+        while (stack.length)
         {
-            // Sélection des termes de la requête
-            for (let termId of termIds)
-            {
-                nodes[termId] = mockNodes[termId];
-            }
+            const current = stack.pop();
+            const neighbors = mock.symptomOf.filter(
+                ([from]) => from === current
+            ).map(
+                ([, to]) => to
+            );
 
-            // Sélection des nœuds liés à tous les éléments de la requête
-            const resultIds = [];
-
-            for (let [id, data] of Object.entries(mockNodes))
+            for (let neighbor of neighbors)
             {
-                if (termIds.every(
-                    termId => includesEdge(mockEdges, id, termId)
-                ))
+                if (!(neighbor in matchingSymptoms))
                 {
-                    nodes[id] = data;
-                    resultIds.push(id);
+                    matchingSymptoms[neighbor] = [];
                 }
-            }
 
-            // Sélection des voisins des résultats de la requête
-            for (let [id, data] of Object.entries(mockNodes))
-            {
-                for (let resultId of resultIds)
+                if (!matchingSymptoms[neighbor].includes(queryTerm.id))
                 {
-                    if (includesEdge(mockEdges, resultId, id))
-                    {
-                        nodes[id] = data;
-                    }
-                }
-            }
-
-            // Sélection des arêtes liant les nœuds sélectionnés
-            for (let [from, to] of mockEdges)
-            {
-                if (
-                    (from in nodes && to in nodes)
-                    && !includesEdge(edges, from, to)
-                )
-                {
-                    edges.push([from, to]);
+                    matchingSymptoms[neighbor].push(queryTerm.id);
+                    stack.push(neighbor);
                 }
             }
         }
+    }
 
-        res({nodes, edges});
-    }, 500);
-});
+    // Seuls les termes ayant été visités par tous les éléments de la requête
+    // et qui sont des maladies constituent des résultats valides
+    return Object.entries(matchingSymptoms).filter(
+        ([id, matches]) => (
+            matches.length === query.length
+            && mock.terms[id].types.includes(mock.types.disease)
+        )
+    ).map(
+        ([id]) => mock.terms[id]
+    );
+};
+
+/**
+ * Récupère tous les termes liés à un ensemble de termes par une relation « a
+ * pour symptôme », directe ou transitive.
+ *
+ * @param terms Ensemble de termes initiaux.
+ * @return Termes de `terms` ainsi que leurs voisins par la relation symptôme.
+ */
+export const exploreSymptoms = async terms =>
+{
+    // Voisins des termes de la requête
+    const selected = terms.map(({id}) => id);
+
+    // Fait un parcours en profondeur issu de chaque résultat pour obtenir
+    // tous les voisins directs ou transitifs par la relation « a pour
+    // symptôme »
+    const stack = [...selected];
+
+    while (stack.length)
+    {
+        const current = stack.pop();
+        const neighbors = mock.hasSymptom.filter(
+            ([from]) => from === current
+        ).map(
+            ([, to]) => to
+        );
+
+        for (let neighbor of neighbors)
+        {
+            if (!selected.includes(neighbor))
+            {
+                selected.push(neighbor);
+                stack.push(neighbor);
+            }
+        }
+    }
+
+    return selected.map(id => mock.terms[id]);;
+};
+
+/**
+ * Calcule le sous-graphe issu d’un ensemble de termes.
+ *
+ * @param terms Ensemble de termes à mettre dans le sous-graphe.
+ * @return Objet contenant les nœuds et les arêtes du graphe.
+ */
+export const symptomsSubgraph = async terms =>
+{
+    const termsIds = terms.map(({id}) => id);
+
+    // Construction du graphe constitué des éléments sélectionnés et des
+    // arêtes qui les lient
+    const nodes = {};
+    const edges = [];
+
+    for (let term of terms)
+    {
+        nodes[term.id] = term;
+    }
+
+    // Sélection des arêtes liant les nœuds sélectionnés
+    for (let [from, to] of mock.hasSymptom)
+    {
+        if (
+            termsIds.includes(from)
+            && termsIds.includes(to)
+        )
+        {
+            edges.push([from, to]);
+        }
+    }
+
+    return {nodes, edges};
+};
diff --git a/app/src/index.js b/app/src/index.js
index 76744ba..dbf8a64 100644
--- a/app/src/index.js
+++ b/app/src/index.js
@@ -1,5 +1,5 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import App from './App.js';
+import App from './components/App.js';
 
 ReactDOM.render(<App />, document.querySelector('#root'));
diff --git a/app/src/util.js b/app/src/util.js
new file mode 100644
index 0000000..807b5e6
--- /dev/null
+++ b/app/src/util.js
@@ -0,0 +1,26 @@
+import {useState, useEffect} from 'react';
+
+/**
+ * Hook permettant d’obtenir des résultats asynchrones.
+ *
+ * @param initial Valeur initiale lorsque la promesse n’a pas répondu.
+ * @param func Fonction renvoyant une promesse.
+ * @param ...args Arguments à passer à `func` qui sont susceptibles de changer.
+ * @return Résultats de la promesse.
+ */
+export const useAsync = (initial, func, ...args) =>
+{
+    const [results, setResults] = useState(initial);
+
+    useEffect(() =>
+    {
+        const fetcher = async () =>
+        {
+            setResults(await func(...args));
+        };
+
+        fetcher();
+    }, args);
+
+    return results;
+};
diff --git a/app/style/style.css b/app/style/style.css
index 5fe2336..c6654c4 100644
--- a/app/style/style.css
+++ b/app/style/style.css
@@ -3,6 +3,7 @@
     --color-accent: #D80C49;
     --color-secondary: #AE1246;
     --color-light: #EEEEEE;
+    --color-light-darker: #E0E0E0;
     --color-dark-lighter: #6A6A6A;
     --color-dark: #1D1D1D;
 
@@ -53,8 +54,9 @@ input
     font-family: var(--font-family);
     font-size: var(--font-size);
 
-    padding: 0 calc(.6 * var(--base-size));
+    padding: 0 calc(.5 * var(--base-size));
     height: calc(2 * var(--base-size));
+    line-height: calc(2 * var(--base-size));
 }
 
 *, *::before, *::after
@@ -137,6 +139,32 @@ input
     border: none;
 }
 
+.TermInput_suggestions
+{
+    width: 100%;
+
+    margin: 0;
+    padding: 0;
+
+    list-style: none;
+}
+
+.TermInput_suggestion
+{
+    height: calc(2 * var(--base-size));
+    padding: 0 calc(.5 * var(--base-size));
+
+    cursor: pointer;
+    line-height: calc(2 * var(--base-size));
+
+    transition: background var(--animation-short) var(--animation-ease-out);
+}
+
+.TermInput_suggestion-focus
+{
+    background: var(--color-light-darker);
+}
+
 /**
  * Graph
  */
diff --git a/package-lock.json b/package-lock.json
index 6e34330..8715ca6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,7 +8,6 @@
       "version": "7.5.5",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
       "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
-      "dev": true,
       "requires": {
         "@babel/highlight": "^7.0.0"
       }
@@ -285,7 +284,6 @@
       "version": "7.5.0",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
       "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
-      "dev": true,
       "requires": {
         "chalk": "^2.0.0",
         "esutils": "^2.0.2",
@@ -1048,6 +1046,11 @@
         }
       }
     },
+    "acorn-jsx": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
+      "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw=="
+    },
     "acorn-walk": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.2.0.tgz",
@@ -1058,7 +1061,6 @@
       "version": "6.10.2",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
       "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
-      "dev": true,
       "requires": {
         "fast-deep-equal": "^2.0.1",
         "fast-json-stable-stringify": "^2.0.0",
@@ -1072,6 +1074,14 @@
       "integrity": "sha1-l6ERlkmyEa0zaR2fn0hqjsn74KM=",
       "dev": true
     },
+    "ansi-escapes": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.0.tgz",
+      "integrity": "sha512-EiYhwo0v255HUL6eDyuLrXEkTi7WwVCLAw+SeOQ7M7qdun1z1pum4DEm/nuqIVbPvi9RPPc9k9LbyBv6H0DwVg==",
+      "requires": {
+        "type-fest": "^0.8.1"
+      }
+    },
     "ansi-regex": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
@@ -1082,7 +1092,6 @@
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
       "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-      "dev": true,
       "requires": {
         "color-convert": "^1.9.0"
       }
@@ -1121,7 +1130,6 @@
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
       "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
-      "dev": true,
       "requires": {
         "sprintf-js": "~1.0.2"
       }
@@ -1150,6 +1158,15 @@
       "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
       "dev": true
     },
+    "array-includes": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.0.3.tgz",
+      "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
+      "requires": {
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.7.0"
+      }
+    },
     "array-unique": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
@@ -1215,6 +1232,11 @@
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "dev": true
     },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg=="
+    },
     "async-each": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
@@ -1312,8 +1334,7 @@
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-      "dev": true
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
     },
     "base": {
       "version": "0.11.2",
@@ -1416,7 +1437,6 @@
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
       "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "dev": true,
       "requires": {
         "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
@@ -1681,13 +1701,17 @@
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
       "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-      "dev": true,
       "requires": {
         "ansi-styles": "^3.2.1",
         "escape-string-regexp": "^1.0.5",
         "supports-color": "^5.3.0"
       }
     },
+    "chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA=="
+    },
     "chokidar": {
       "version": "2.1.8",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
@@ -1756,6 +1780,11 @@
       "integrity": "sha512-1QL4544moEsDVH9T/l6Cemov/37iv1RtoKf7NJ04A60+4MREXNfx/QvavbH6QoGdsD4N4Mwy49cmaINR/o2mdg==",
       "dev": true
     },
+    "cli-width": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
+      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk="
+    },
     "cliui": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
@@ -1825,7 +1854,6 @@
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
       "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
-      "dev": true,
       "requires": {
         "color-name": "1.1.3"
       }
@@ -1833,8 +1861,7 @@
     "color-name": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
-      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
-      "dev": true
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
     },
     "color-string": {
       "version": "1.5.3",
@@ -1876,8 +1903,7 @@
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-      "dev": true
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
     },
     "concat-stream": {
       "version": "1.6.2",
@@ -2001,7 +2027,6 @@
       "version": "6.0.5",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
       "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
-      "dev": true,
       "requires": {
         "nice-try": "^1.0.4",
         "path-key": "^2.0.1",
@@ -2368,7 +2393,6 @@
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
       "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
-      "dev": true,
       "requires": {
         "ms": "^2.1.1"
       }
@@ -2388,8 +2412,7 @@
     "deep-is": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
-      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
-      "dev": true
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ="
     },
     "defaults": {
       "version": "1.0.3",
@@ -2412,7 +2435,6 @@
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
       "integrity": "sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==",
-      "dev": true,
       "requires": {
         "object-keys": "^1.0.12"
       }
@@ -2497,6 +2519,14 @@
         "randombytes": "^2.0.0"
       }
     },
+    "doctrine": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
+      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
+      "requires": {
+        "esutils": "^2.0.2"
+      }
+    },
     "dom-helpers": {
       "version": "5.1.3",
       "resolved": "https://registry.npmjs.org/dom-helpers/-/dom-helpers-5.1.3.tgz",
@@ -2640,8 +2670,7 @@
     "emoji-regex": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
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       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
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-      "dev": true
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g=="
     },
     "vendors": {
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@@ -7364,7 +7840,6 @@
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
-      "dev": true,
       "requires": {
         "isexe": "^2.0.0"
       }
@@ -7378,8 +7853,7 @@
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
-      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
-      "dev": true
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ=="
     },
     "wrap-ansi": {
       "version": "5.1.0",
@@ -7412,8 +7886,15 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
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     "ws": {
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diff --git a/package.json b/package.json
index e31a215..8638469 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,7 @@
   "name": "wikimedica-disease-search",
   "version": "0.1.0",
   "private": true,
+  "type": "module",
   "main": "index.js",
   "scripts": {
     "dev": "parcel app/index.html"
@@ -15,6 +16,8 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.7.4",
+    "eslint": "^6.7.2",
+    "eslint-plugin-react": "^7.17.0",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",
     "react-transition-group": "^4.3.0",