1 | import LodashWrapper from './_LodashWrapper';
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2 | import baseFlatten from './_baseFlatten';
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3 | import getData from './_getData';
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4 | import getFuncName from './_getFuncName';
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5 | import isArray from './isArray';
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6 | import isLaziable from './_isLaziable';
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7 | import rest from './rest';
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8 |
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9 |
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10 | var LARGE_ARRAY_SIZE = 200;
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11 |
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12 |
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13 | var FUNC_ERROR_TEXT = 'Expected a function';
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14 |
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15 |
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16 | var CURRY_FLAG = 8,
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17 | PARTIAL_FLAG = 32,
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18 | ARY_FLAG = 128,
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19 | REARG_FLAG = 256;
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20 |
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21 |
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22 |
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23 |
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24 |
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25 |
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26 |
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27 |
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28 | function createFlow(fromRight) {
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29 | return rest(function(funcs) {
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30 | funcs = baseFlatten(funcs, 1);
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31 |
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32 | var length = funcs.length,
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33 | index = length,
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34 | prereq = LodashWrapper.prototype.thru;
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35 |
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36 | if (fromRight) {
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37 | funcs.reverse();
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38 | }
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39 | while (index--) {
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40 | var func = funcs[index];
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41 | if (typeof func != 'function') {
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42 | throw new TypeError(FUNC_ERROR_TEXT);
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43 | }
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44 | if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
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45 | var wrapper = new LodashWrapper([], true);
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46 | }
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47 | }
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48 | index = wrapper ? index : length;
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49 | while (++index < length) {
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50 | func = funcs[index];
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51 |
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52 | var funcName = getFuncName(func),
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53 | data = funcName == 'wrapper' ? getData(func) : undefined;
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54 |
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55 | if (data && isLaziable(data[0]) &&
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56 | data[1] == (ARY_FLAG | CURRY_FLAG | PARTIAL_FLAG | REARG_FLAG) &&
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57 | !data[4].length && data[9] == 1
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58 | ) {
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59 | wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
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60 | } else {
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61 | wrapper = (func.length == 1 && isLaziable(func))
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62 | ? wrapper[funcName]()
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63 | : wrapper.thru(func);
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64 | }
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65 | }
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66 | return function() {
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67 | var args = arguments,
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68 | value = args[0];
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69 |
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70 | if (wrapper && args.length == 1 &&
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71 | isArray(value) && value.length >= LARGE_ARRAY_SIZE) {
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72 | return wrapper.plant(value).value();
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73 | }
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74 | var index = 0,
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75 | result = length ? funcs[index].apply(this, args) : value;
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76 |
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77 | while (++index < length) {
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78 | result = funcs[index].call(this, result);
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79 | }
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80 | return result;
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81 | };
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82 | });
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83 | }
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84 |
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85 | export default createFlow;
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