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1
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fast_replace = function(string, pattern, replacement, ...) {
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2
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#' @title Fast escape replace
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3
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#'
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4
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#' @description Fast escape function for limited case where only one pattern
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5
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#' provided actually matches anything
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6
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#'
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7
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#' @param string a character vector where replacements are sought
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8
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#' @param pattern Character string to be matched in the given character vector
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9
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#' @param replacement Character string equal in length to pattern or of length
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10
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#' one which are a replacement for matched pattern.
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11
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#' @param \dots arguments to pass to gsub
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12
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13
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6
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for (i in seq_along(pattern)) {
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14
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6
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string = gsub(pattern[i], replacement[i], string, ...)
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15
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}
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16
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6
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return(string)
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17
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}
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18
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19
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get_matches = function(string, pattern, i, ...) {
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20
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#' @title Get all matches
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21
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#'
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22
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#' @description Helper function to be used in a loop to check each pattern
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#' provided for matches
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24
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#'
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25
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#' @param string a character vector where replacements are sought
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#' @param pattern Character string to be matched in the given character vector
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#' @param i an iterator provided by a looping function
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#' @param \dots arguments to pass to gregexpr
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29
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30
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6
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tmp = gregexpr(pattern[i], string, ...)
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31
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6
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start = tmp[[1]]
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32
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6
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length = attr(tmp[[1]], "match.length")
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33
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return(matrix(cbind(i, start, length, start + length - 1), ncol = 4))
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34
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}
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35
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36
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filter_overlap = function(x) {
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37
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#' @title Filter overlaps from matches
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38
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#'
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39
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#' @description Helper function used to identify which results from gregexpr
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40
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#' overlap other matches and filter out shorter, overlapped results
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#'
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42
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#' @param x Matrix of gregexpr results, 4 columns, index of column matched,
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43
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#' start of match, length of match, end of match. Produced exclusively from
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44
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#' a worker function in mgsub
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45
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6
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for (i in nrow(x):2) {
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46
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6
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s = x[i, 2]
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47
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6
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ps = x[1:(i - 1), 2]
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48
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e = x[i, 4]
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49
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pe = x[1:(i - 1), 4]
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50
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6
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if (any(ps <= s & pe >= s)) {
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51
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x = x[-i, ]
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52
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6
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next
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53
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}
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54
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6
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if (any(ps <= e & pe >= e)) {
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55
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x = x[-i, ]
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56
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6
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next
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}
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58
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}
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59
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6
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return(matrix(x, ncol = 4))
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60
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}
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bmewing