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backend/node_modules/imapflow/lib/handler/imap-formal-syntax.js

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+/* eslint object-shorthand:0, new-cap: 0, no-useless-concat: 0 */
+
+'use strict';
+
+// IMAP Formal Syntax
+// http://tools.ietf.org/html/rfc3501#section-9
+
+function expandRange(start, end) {
+    let chars = [];
+    for (let i = start; i <= end; i++) {
+        chars.push(i);
+    }
+    return String.fromCharCode(...chars);
+}
+
+function excludeChars(source, exclude) {
+    let sourceArr = Array.prototype.slice.call(source);
+    for (let i = sourceArr.length - 1; i >= 0; i--) {
+        if (exclude.indexOf(sourceArr[i]) >= 0) {
+            sourceArr.splice(i, 1);
+        }
+    }
+    return sourceArr.join('');
+}
+
+module.exports = {
+    CHAR() {
+        let value = expandRange(0x01, 0x7f);
+        this.CHAR = function () {
+            return value;
+        };
+        return value;
+    },
+
+    CHAR8() {
+        let value = expandRange(0x01, 0xff);
+        this.CHAR8 = function () {
+            return value;
+        };
+        return value;
+    },
+
+    SP() {
+        return ' ';
+    },
+
+    CTL() {
+        let value = expandRange(0x00, 0x1f) + '\x7F';
+        this.CTL = function () {
+            return value;
+        };
+        return value;
+    },
+
+    DQUOTE() {
+        return '"';
+    },
+
+    ALPHA() {
+        let value = expandRange(0x41, 0x5a) + expandRange(0x61, 0x7a);
+        this.ALPHA = function () {
+            return value;
+        };
+        return value;
+    },
+
+    DIGIT() {
+        let value = expandRange(0x30, 0x39);
+        this.DIGIT = function () {
+            return value;
+        };
+        return value;
+    },
+
+    'ATOM-CHAR'() {
+        let value = excludeChars(this.CHAR(), this['atom-specials']());
+        this['ATOM-CHAR'] = function () {
+            return value;
+        };
+        return value;
+    },
+
+    'ASTRING-CHAR'() {
+        let value = this['ATOM-CHAR']() + this['resp-specials']();
+        this['ASTRING-CHAR'] = function () {
+            return value;
+        };
+        return value;
+    },
+
+    'TEXT-CHAR'() {
+        let value = excludeChars(this.CHAR(), '\r\n');
+        this['TEXT-CHAR'] = function () {
+            return value;
+        };
+        return value;
+    },
+
+    'atom-specials'() {
+        let value = '(' + ')' + '{' + this.SP() + this.CTL() + this['list-wildcards']() + this['quoted-specials']() + this['resp-specials']();
+        this['atom-specials'] = function () {
+            return value;
+        };
+        return value;
+    },
+
+    'list-wildcards'() {
+        return '%' + '*';
+    },
+
+    'quoted-specials'() {
+        let value = this.DQUOTE() + '\\';
+        this['quoted-specials'] = function () {
+            return value;
+        };
+        return value;
+    },
+
+    'resp-specials'() {
+        return ']';
+    },
+
+    tag() {
+        let value = excludeChars(this['ASTRING-CHAR'](), '+');
+        this.tag = function () {
+            return value;
+        };
+        return value;
+    },
+
+    command() {
+        let value = this.ALPHA() + this.DIGIT() + '-';
+        this.command = function () {
+            return value;
+        };
+        return value;
+    },
+
+    verify(str, allowedChars) {
+        for (let i = 0, len = str.length; i < len; i++) {
+            if (allowedChars.indexOf(str.charAt(i)) < 0) {
+                return i;
+            }
+        }
+        return -1;
+    }
+};