20060303a

1 files changed, 65 insertions, 0 deletions

diff --git a/appl/lib/regexutils.b b/appl/lib/regexutils.b
new file mode 100644
index 00000000..4040f0bf
--- /dev/null
+++ b/appl/lib/regexutils.b
@@ -0,0 +1,65 @@
+implement RegexUtils;
+
+# matching and substitution functions
+# evb@lucent.com
+
+include "sys.m";
+	sys: Sys;
+	
+include "regexutils.m";
+
+init()
+{
+	if (sys == nil)
+		sys = load Sys Sys->PATH;
+		
+	regex = load Regex Regex->PATH;
+	if (regex == nil)
+		raise "fail: Regex not loaded";
+}
+
+match(pattern: Regex->Re, s: string): string
+{
+	pos := regex->execute(pattern, s);
+	if (pos == nil)
+		return "";
+	(beg, end) := pos[0];
+	
+	return s[beg:end];
+}
+
+match_mult(pattern: Regex->Re, s: string): array of (int, int)
+{
+	return regex->execute(pattern, s);
+}
+
+sub(text, pattern, new: string): string
+{
+	return sub_re(text, regex->compile(pattern, 0).t0, new);
+}
+
+sub_re(text: string, pattern: Regex->Re, new: string): string
+{
+	pos := regex->execute(pattern, text);
+	if (pos == nil) 
+		return text;
+	
+	(beg, end) := pos[0];
+	newline := text[:beg] + new + text[end:];
+	return newline;
+}
+
+subg(text, pattern, new: string): string
+{
+	return subg_re(text, regex->compile(pattern, 0).t0, new);
+}
+
+subg_re(text: string, pattern: Regex->Re, new: string): string
+{
+	oldtext := text;
+	while ( (text = sub_re(text, pattern, new)) != oldtext) {
+		oldtext = text;
+	}
+
+	return text;
+}