# hi_latex() works without prompts

```{r}
hi_latex('1+1')
hi_latex('  1 +    1')
hi_latex(c('  if (TRUE ){', 'foo && bar}'))
```
```
\hlnum{1}\hlopt{+}\hlnum{1}
  \hlnum{1} \hlopt{+}    \hlnum{1}
  \hlkwa{if} \hldef{(}\hlnum{TRUE} \hldef{)\{}
\hldef{foo} \hlopt{&&} \hldef{bar\}}
```

# hi_latex() works with prompts

```{r}
hi_latex('1+1', prompt = TRUE)
hi_latex(c('  if (TRUE ){', 'foo && bar}'), prompt = TRUE)
```
```
\hldef{> }\hlnum{1}\hlopt{+}\hlnum{1}
\hldef{> }  \hlkwa{if} \hldef{(}\hlnum{TRUE} \hldef{)\{}
\hldef{+ }\hldef{foo} \hlopt{&&} \hldef{bar\}}
```

# hi_latex() preserves blank lines

```{r}
hi_latex(c('1+1', '', 'foo(x=3) # comm'))
```
```
\hlnum{1}\hlopt{+}\hlnum{1}

\hlkwd{foo}\hldef{(}\hlkwc{x}\hldef{=}\hlnum{3}\hldef{)} \hlcom{# comm}
```

# the fallback method recognizes comments, functions and strings

```{r}
hi_latex('1+1 # a comment', fallback = TRUE)
hi_latex('paste("STRING", \'string\')', fallback = TRUE)
```
```
1+1 \hlcom{# a comment}
\hlkwd{paste}(\hlsng{"STRING"}, \hlsng{'string'})
```

# the fallback mode is used when the code does not parse

```{r}
has_warning(res <- hi_latex('1+1+ # comment'))
res
```
```
[1] TRUE
1+1+ \hlcom{# comment}
```

# hilight() works even if code only contains comments

```{r}
hi_latex('# only comments')
```
```
\hlcom{# only comments}
```

# the right arrow -> is preserved

```{r}
hi_latex('1 ->x # foo')
```
```
\hlnum{1} \hlkwb{->}\hldef{x} \hlcom{# foo}
```

# blank lines before/after code are preserved

```{r}
hi_latex(c('', '', '1'))
hi_latex(c('', '', '1', ''))
```
```


\hlnum{1}


\hlnum{1}

```

# custom markup also works

```{r}
hi_html('1+ 1')
my_cmd = cmd_html
my_cmd['NUM_CONST', 1] = '<span class="my num">'
hi_html('1+ 1', markup = my_cmd)
rm(my_cmd)
```
```
<span class="hl num">1</span><span class="hl opt">+</span> <span class="hl num">1</span>
<span class="my num">1</span><span class="hl opt">+</span> <span class="my num">1</span>
```