Fix #9 wrap_result handles groups that start end at same index

Fixes issues with adding <span> and </span> around zero-length groups and more generally groups that start and end at the same index.

Ensures that g00 wraps all others, then at index with close/opens, closes open groups first before opening new groups.

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: regexplain
 Title: Rstudio Addin to Explain, Test and Build Regular Expressions
-Version: 0.2.1
+Version: 0.2.1.9000
 Date: 2018-04-04
 Authors@R: c(
     person("Garrick", "Aden-Buie", email = "g.adenbuie@gmail.com", role = c("aut", "cre")),

R/run_regex.R

@@ -60,12 +60,23 @@ wrap_result <- function(x, escape = FALSE, exact = FALSE) {
   inserts <- inserts %>%
     tidyr::gather(type, loc, start:end) %>%
     filter(!is.na(.data$loc)) %>%
+    dplyr::arrange(loc, class, desc(type)) %>%
     mutate(
       class = ifelse(.data$pad > 0, sprintf("%s pad%02d", .data$class, .data$pad), .data$class),
       insert = ifelse(.data$type == 'start', sprintf('<span class="%s">', .data$class), "</span>")
-    ) %>%
+    )
+  inserts_g0 <- filter(inserts, class == "group g00")
+  inserts_other <- filter(inserts, class != "group g00")
+  inserts <- dplyr::bind_rows(
+    filter(inserts_g0, type == "start"),
+    inserts_other,
+    filter(inserts_g0, type == "end")
+  ) %>%
+    mutate(type = sprintf("%05d%s", 1:nrow(.), type)) %>%
     group_by(.data$loc, .data$type) %>%
-    summarize(insert = paste(.data$insert, collapse = ''))
+    summarize(insert = paste(.data$insert, collapse = '')) %>%
+    dplyr::ungroup() %>%
+    mutate(type = sub("^\\d{5}", "", type))
 
   # inserts now gives html (span open and close) to insert and loc
   # first split text at inserts$loc locations,

tests/testthat/test-wrap_result.R

@@ -0,0 +1,35 @@
+context("test-wrap_result.R")
+
+test_that("wrap_result handles zero length groups", {
+  # Issue #9
+  # Type 'q()' to quit R.
+  # (?<=\()([^)]*)(?=\))
+  text <- "Type 'q()' to quit R."
+  pattern <- "(?<=\\()([^)]*)(?=\\))"
+  res <- wrap_result(run_regex(text, pattern, perl = TRUE)[[1]])
+  expect_equal(res, "Type 'q(<span class=\"group g00\"><span class=\"group g01\"></span></span>)' to quit R.")
+})
+
+test_that("wrap_results generally works", {
+  text <- "apples"
+  pattern <- "apples"
+  res <- wrap_result(run_regex(text, pattern, perl = TRUE)[[1]])
+  expect_equal(res, "<span class=\"group g00\">apples</span>")
+
+  text <- "He wheeled the bike past the winding road."
+  pattern <- "(a|the) ([^ ]+)"
+  res <- wrap_result(run_regex(text, pattern, perl = TRUE)[[1]])
+  expect_equal(res, "He wheeled <span class=\"group g00\"><span class=\"group g01\">the</span> <span class=\"group g02\">bike</span></span> past the winding road.")
+
+  text <- ".15in"
+  pattern <- "^(auto|inherit|((\\.\\d+)|(\\d+(\\.\\d+)?))(%|in|cm|mm|em|ex|pt|pc|px|vh|vw|vmin|vmax))$"
+  res <- wrap_result(run_regex(text, pattern, perl = TRUE)[[1]])
+  expect_equal(res, "<span class=\"group g00\"><span class=\"group g01\"><span class=\"group g02 pad01\"><span class=\"group g03 pad02\">.15</span></span><span class=\"group g06 pad01\">in</span></span></span>")
+})
+
+test_that("wrap_results works when groups start and end at same index", {
+  text <- "7282298386"
+  pattern <- "\\(?(\\d{3})[-). ]?(\\d{3})[- .]?(\\d{4})"
+  res <-  wrap_result(run_regex(text, pattern, perl = TRUE)[[1]])
+  expect_equal(res, "<span class=\"group g00\"><span class=\"group g01\">728</span><span class=\"group g02\">229</span><span class=\"group g03\">8386</span></span>")
+})