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Viewing file:     Util.js (8.49 KB)      -rwxrwxr-x

'use strict';

var Util = {
    noop: function () {
    },

    strip: function (value, re) {
        return value.replace(re, '');
    },

    getPostDelimiter: function (value, delimiter, delimiters) {
        // single delimiter
        if (delimiters.length === 0) {
            return value.slice(-delimiter.length) === delimiter ? delimiter : '';
        }

        // multiple delimiters
        var matchedDelimiter = '';
        delimiters.forEach(function (current) {
            if (value.slice(-current.length) === current) {
                matchedDelimiter = current;
            }
        });

        return matchedDelimiter;
    },

    getDelimiterREByDelimiter: function (delimiter) {
        return new RegExp(delimiter.replace(/([.?*+^$[\]\\(){}|-])/g, '\\$1'), 'g');
    },

    getNextCursorPosition: function (prevPos, oldValue, newValue, delimiter, delimiters) {
      // If cursor was at the end of value, just place it back.
      // Because new value could contain additional chars.
      if (oldValue.length === prevPos) {
          return newValue.length;
      }

      return prevPos + this.getPositionOffset(prevPos, oldValue, newValue, delimiter ,delimiters);
    },

    getPositionOffset: function (prevPos, oldValue, newValue, delimiter, delimiters) {
        var oldRawValue, newRawValue, lengthOffset;

        oldRawValue = this.stripDelimiters(oldValue.slice(0, prevPos), delimiter, delimiters);
        newRawValue = this.stripDelimiters(newValue.slice(0, prevPos), delimiter, delimiters);
        lengthOffset = oldRawValue.length - newRawValue.length;

        return (lengthOffset !== 0) ? (lengthOffset / Math.abs(lengthOffset)) : 0;
    },

    stripDelimiters: function (value, delimiter, delimiters) {
        var owner = this;

        // single delimiter
        if (delimiters.length === 0) {
            var delimiterRE = delimiter ? owner.getDelimiterREByDelimiter(delimiter) : '';

            return value.replace(delimiterRE, '');
        }

        // multiple delimiters
        delimiters.forEach(function (current) {
            current.split('').forEach(function (letter) {
                value = value.replace(owner.getDelimiterREByDelimiter(letter), '');
            });
        });

        return value;
    },

    headStr: function (str, length) {
        return str.slice(0, length);
    },

    getMaxLength: function (blocks) {
        return blocks.reduce(function (previous, current) {
            return previous + current;
        }, 0);
    },

    // strip prefix
    // Before type  |   After type    |     Return value
    // PEFIX-...    |   PEFIX-...     |     ''
    // PREFIX-123   |   PEFIX-123     |     123
    // PREFIX-123   |   PREFIX-23     |     23
    // PREFIX-123   |   PREFIX-1234   |     1234
    getPrefixStrippedValue: function (value, prefix, prefixLength, prevResult, delimiter, delimiters, noImmediatePrefix, tailPrefix, signBeforePrefix) {
        // No prefix
        if (prefixLength === 0) {
          return value;
        }

        // Value is prefix
        if (value === prefix && value !== '') {
          return '';
        }

        if (signBeforePrefix && (value.slice(0, 1) == '-')) {
            var prev = (prevResult.slice(0, 1) == '-') ? prevResult.slice(1) : prevResult;
            return '-' + this.getPrefixStrippedValue(value.slice(1), prefix, prefixLength, prev, delimiter, delimiters, noImmediatePrefix, tailPrefix, signBeforePrefix);
        }

        // Pre result prefix string does not match pre-defined prefix
        if (prevResult.slice(0, prefixLength) !== prefix && !tailPrefix) {
            // Check if the first time user entered something
            if (noImmediatePrefix && !prevResult && value) return value;
            return '';
        } else if (prevResult.slice(-prefixLength) !== prefix && tailPrefix) {
            // Check if the first time user entered something
            if (noImmediatePrefix && !prevResult && value) return value;
            return '';
        }

        var prevValue = this.stripDelimiters(prevResult, delimiter, delimiters);

        // New value has issue, someone typed in between prefix letters
        // Revert to pre value
        if (value.slice(0, prefixLength) !== prefix && !tailPrefix) {
            return prevValue.slice(prefixLength);
        } else if (value.slice(-prefixLength) !== prefix && tailPrefix) {
            return prevValue.slice(0, -prefixLength - 1);
        }

        // No issue, strip prefix for new value
        return tailPrefix ? value.slice(0, -prefixLength) : value.slice(prefixLength);
    },

    getFirstDiffIndex: function (prev, current) {
        var index = 0;

        while (prev.charAt(index) === current.charAt(index)) {
            if (prev.charAt(index++) === '') {
                return -1;
            }
        }

        return index;
    },

    getFormattedValue: function (value, blocks, blocksLength, delimiter, delimiters, delimiterLazyShow) {
        var result = '',
            multipleDelimiters = delimiters.length > 0,
            currentDelimiter = '';

        // no options, normal input
        if (blocksLength === 0) {
            return value;
        }

        blocks.forEach(function (length, index) {
            if (value.length > 0) {
                var sub = value.slice(0, length),
                    rest = value.slice(length);

                if (multipleDelimiters) {
                    currentDelimiter = delimiters[delimiterLazyShow ? (index - 1) : index] || currentDelimiter;
                } else {
                    currentDelimiter = delimiter;
                }

                if (delimiterLazyShow) {
                    if (index > 0) {
                        result += currentDelimiter;
                    }

                    result += sub;
                } else {
                    result += sub;

                    if (sub.length === length && index < blocksLength - 1) {
                        result += currentDelimiter;
                    }
                }

                // update remaining string
                value = rest;
            }
        });

        return result;
    },

    // move cursor to the end
    // the first time user focuses on an input with prefix
    fixPrefixCursor: function (el, prefix, delimiter, delimiters) {
        if (!el) {
            return;
        }

        var val = el.value,
            appendix = delimiter || (delimiters[0] || ' ');

        if (!el.setSelectionRange || !prefix || (prefix.length + appendix.length) <= val.length) {
            return;
        }

        var len = val.length * 2;

        // set timeout to avoid blink
        setTimeout(function () {
            el.setSelectionRange(len, len);
        }, 1);
    },

    // Check if input field is fully selected
    checkFullSelection: function(value) {
      try {
        var selection = window.getSelection() || document.getSelection() || {};
        return selection.toString().length === value.length;
      } catch (ex) {
        // Ignore
      }

      return false;
    },

    setSelection: function (element, position, doc) {
        if (element !== this.getActiveElement(doc)) {
            return;
        }

        // cursor is already in the end
        if (element && element.value.length <= position) {
          return;
        }

        if (element.createTextRange) {
            var range = element.createTextRange();

            range.move('character', position);
            range.select();
        } else {
            try {
                element.setSelectionRange(position, position);
            } catch (e) {
                // eslint-disable-next-line
                console.warn('The input element type does not support selection');
            }
        }
    },

    getActiveElement: function(parent) {
        var activeElement = parent.activeElement;
        if (activeElement && activeElement.shadowRoot) {
            return this.getActiveElement(activeElement.shadowRoot);
        }
        return activeElement;
    },

    isAndroid: function () {
        return navigator && /android/i.test(navigator.userAgent);
    },

    // On Android chrome, the keyup and keydown events
    // always return key code 229 as a composition that
    // buffers the user’s keystrokes
    // see https://github.com/nosir/cleave.js/issues/147
    isAndroidBackspaceKeydown: function (lastInputValue, currentInputValue) {
        if (!this.isAndroid() || !lastInputValue || !currentInputValue) {
            return false;
        }

        return currentInputValue === lastInputValue.slice(0, -1);
    }
};

module.exports = Util;