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node_modules/chardet/lib/encoding/iso2022.js

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+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ISO_2022_CN = exports.ISO_2022_KR = exports.ISO_2022_JP = void 0;
+const match_1 = __importDefault(require("../match"));
+class ISO_2022 {
+    constructor() {
+        this.escapeSequences = [];
+    }
+    name() {
+        return 'ISO_2022';
+    }
+    match(det) {
+        let i, j;
+        let escN;
+        let hits = 0;
+        let misses = 0;
+        let shifts = 0;
+        let confidence;
+        const text = det.inputBytes;
+        const textLen = det.inputLen;
+        scanInput: for (i = 0; i < textLen; i++) {
+            if (text[i] == 0x1b) {
+                checkEscapes: for (escN = 0; escN < this.escapeSequences.length; escN++) {
+                    const seq = this.escapeSequences[escN];
+                    if (textLen - i < seq.length)
+                        continue checkEscapes;
+                    for (j = 1; j < seq.length; j++)
+                        if (seq[j] != text[i + j])
+                            continue checkEscapes;
+                    hits++;
+                    i += seq.length - 1;
+                    continue scanInput;
+                }
+                misses++;
+            }
+            if (text[i] == 0x0e || text[i] == 0x0f)
+                shifts++;
+        }
+        if (hits == 0)
+            return null;
+        confidence = (100 * hits - 100 * misses) / (hits + misses);
+        if (hits + shifts < 5)
+            confidence -= (5 - (hits + shifts)) * 10;
+        return confidence <= 0 ? null : (0, match_1.default)(det, this, confidence);
+    }
+}
+class ISO_2022_JP extends ISO_2022 {
+    constructor() {
+        super(...arguments);
+        this.escapeSequences = [
+            [0x1b, 0x24, 0x28, 0x43],
+            [0x1b, 0x24, 0x28, 0x44],
+            [0x1b, 0x24, 0x40],
+            [0x1b, 0x24, 0x41],
+            [0x1b, 0x24, 0x42],
+            [0x1b, 0x26, 0x40],
+            [0x1b, 0x28, 0x42],
+            [0x1b, 0x28, 0x48],
+            [0x1b, 0x28, 0x49],
+            [0x1b, 0x28, 0x4a],
+            [0x1b, 0x2e, 0x41],
+            [0x1b, 0x2e, 0x46],
+        ];
+    }
+    name() {
+        return 'ISO-2022-JP';
+    }
+    language() {
+        return 'ja';
+    }
+}
+exports.ISO_2022_JP = ISO_2022_JP;
+class ISO_2022_KR extends ISO_2022 {
+    constructor() {
+        super(...arguments);
+        this.escapeSequences = [[0x1b, 0x24, 0x29, 0x43]];
+    }
+    name() {
+        return 'ISO-2022-KR';
+    }
+    language() {
+        return 'kr';
+    }
+}
+exports.ISO_2022_KR = ISO_2022_KR;
+class ISO_2022_CN extends ISO_2022 {
+    constructor() {
+        super(...arguments);
+        this.escapeSequences = [
+            [0x1b, 0x24, 0x29, 0x41],
+            [0x1b, 0x24, 0x29, 0x47],
+            [0x1b, 0x24, 0x2a, 0x48],
+            [0x1b, 0x24, 0x29, 0x45],
+            [0x1b, 0x24, 0x2b, 0x49],
+            [0x1b, 0x24, 0x2b, 0x4a],
+            [0x1b, 0x24, 0x2b, 0x4b],
+            [0x1b, 0x24, 0x2b, 0x4c],
+            [0x1b, 0x24, 0x2b, 0x4d],
+            [0x1b, 0x4e],
+            [0x1b, 0x4f],
+        ];
+    }
+    name() {
+        return 'ISO-2022-CN';
+    }
+    language() {
+        return 'zh';
+    }
+}
+exports.ISO_2022_CN = ISO_2022_CN;
+//# sourceMappingURL=iso2022.js.map