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Specify that TabExpandedString only works on single lines

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This commit is contained in:
Riccardo Azzolini 2019-08-12 18:55:30 +02:00
parent 804fee4db0
commit c37f7f52b3
1 changed files with 16 additions and 9 deletions
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25
core/src/main/java/it/cavallium/warppi/math/rules/dsl/errorutils/TabExpandedString.java
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@ -3,7 +3,7 @@ package it.cavallium.warppi.math.rules.dsl.errorutils;
import java.util.Arrays;
/**
* Represents a string in which tabs have been expanded (replaced with spaces).
* Represents a line of text in which tabs have been expanded (replaced with spaces).
* <p>
* Each tab character is replaced with the number of spaces required to get to the next tab stop
* (that is, the next column which is a multiple of the tab stop width).
@ -15,8 +15,9 @@ public class TabExpandedString {
/**
* Constructs a tab-expanded string with the given tab stop width.
*
* @param string The string to expand.
* @param string The string to expand. Must not contain any line separator characters ('\r' or '\n').
* @param tabWidth The tab stop width.
* @throws IllegalArgumentException If <code>string</code> contains any line separator characters.
*/
public TabExpandedString(final String string, final int tabWidth) {
final StringBuilder builder = new StringBuilder();
@ -26,14 +27,20 @@ public class TabExpandedString {
final char c = string.charAt(i);
charWidths[i] = 1;
if (c == '\t') {
builder.append(' ');
while (builder.length() % tabWidth != 0) {
switch (c) {
case '\r':
case '\n':
throw new IllegalArgumentException("The string to expand is not a single line: " + string);
case '\t':
builder.append(' ');
charWidths[i]++;
}
} else {
builder.append(c);
while (builder.length() % tabWidth != 0) {
builder.append(' ');
charWidths[i]++;
}
break;
default:
builder.append(c);
break;
}
}