pip-services3-expressions-nodex/obj/src/csv/CsvQuoteState.js

Tokenizers, parsers and expression calculators for Pip.Services in Node.js / ES2017

"use strict";
/** @module csv */
Object.defineProperty(exports, "__esModule", { value: true });
exports.CsvQuoteState = void 0;
const Token_1 = require("../tokenizers/Token");
const TokenType_1 = require("../tokenizers/TokenType");
const CharValidator_1 = require("../tokenizers/utilities/CharValidator");
/**
 * Implements a quote string state object for CSV streams.
 */
class CsvQuoteState {
    /**
     * Gets the next token from the stream started from the character linked to this state.
     * @param scanner A textual string to be tokenized.
     * @param tokenizer A tokenizer class that controls the process.
     * @returns The next token from the top of the stream.
     */
    nextToken(scanner, tokenizer) {
        let firstSymbol = scanner.read();
        let line = scanner.line();
        let column = scanner.column();
        let tokenValue = "";
        tokenValue = tokenValue + String.fromCharCode(firstSymbol);
        for (let nextSymbol = scanner.read(); !CharValidator_1.CharValidator.isEof(nextSymbol); nextSymbol = scanner.read()) {
            tokenValue = tokenValue + String.fromCharCode(nextSymbol);
            if (nextSymbol == firstSymbol) {
                if (scanner.peek() == firstSymbol) {
                    nextSymbol = scanner.read();
                    tokenValue = tokenValue + String.fromCharCode(nextSymbol);
                }
                else {
                    break;
                }
            }
        }
        return new Token_1.Token(TokenType_1.TokenType.Quoted, tokenValue, line, column);
    }
    /**
     * Encodes a string value.
     * @param value A string value to be encoded.
     * @param quoteSymbol A string quote character.
     * @returns An encoded string.
     */
    encodeString(value, quoteSymbol) {
        if (value != null) {
            let quoteString = String.fromCharCode(quoteSymbol);
            let result = quoteString
                + value.replace(quoteString, quoteString + quoteString)
                + quoteString;
            return result;
        }
        else {
            return null;
        }
    }
    /**
     * Decodes a string value.
     * @param value A string value to be decoded.
     * @param quoteSymbol A string quote character.
     * @returns An decoded string.
     */
    decodeString(value, quoteSymbol) {
        if (value == null)
            return null;
        if (value.length >= 2 && value.charCodeAt(0) == quoteSymbol
            && value.charCodeAt(value.length - 1) == quoteSymbol) {
            let quoteString = String.fromCharCode(quoteSymbol);
            return value.substring(1, value.length - 1).replace(quoteString + quoteString, quoteString);
        }
        return value;
    }
}
exports.CsvQuoteState = CsvQuoteState;
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