mirror of
https://github.com/golang/go
synced 2024-11-12 09:30:25 -07:00
more comment work.
got rid of regexps. primary bug fix is that // inside /* */ do not get stripped anymore, so that the text inside /* int a; // int b; int c; */ is int a; // int b; int c; before, the "int b;" line was being uncommented too. R=gri DELTA=65 (13 added, 42 deleted, 10 changed) OCL=35334 CL=35404
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@ -9,36 +9,12 @@ package doc
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import (
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"go/ast";
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"io";
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"once";
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"regexp";
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"strings";
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"template"; // for htmlEscape
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)
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// Comment extraction
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var (
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comment_markers *regexp.Regexp;
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trailing_whitespace *regexp.Regexp;
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comment_junk *regexp.Regexp;
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)
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func makeRex(s string) *regexp.Regexp {
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re, err := regexp.Compile(s);
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if err != nil {
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panic("MakeRegexp ", s, " ", err.String());
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}
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return re;
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}
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// TODO(rsc): Cannot use var initialization for regexps,
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// because Regexp constructor needs threads.
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func setupRegexps() {
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comment_markers = makeRex("^/[/*] ?");
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trailing_whitespace = makeRex("[ \t\r]+$");
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comment_junk = makeRex("^[ \t]*(/\\*|\\*/)[ \t]*$");
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}
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// CommentText returns the text of comment,
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// with the comment markers - //, /*, and */ - removed.
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func CommentText(comment *ast.CommentGroup) string {
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@ -50,39 +26,34 @@ func CommentText(comment *ast.CommentGroup) string {
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comments[i] = string(c.Text);
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}
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once.Do(setupRegexps);
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lines := make([]string, 0, 20);
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for _, c := range comments {
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// split on newlines
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// Remove comment markers.
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// The parser has given us exactly the comment text.
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switch n := len(c); {
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case n >= 4 && c[0:2] == "/*" && c[n-2:n] == "*/":
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c = c[2:n-2];
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case n >= 2 && c[0:2] == "//":
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c = c[2:n];
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// Remove leading space after //, if there is one.
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if len(c) > 0 && c[0] == ' ' {
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c = c[1:len(c)];
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}
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}
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// Split on newlines.
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cl := strings.Split(c, "\n", 0);
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// walk lines, stripping comment markers
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w := 0;
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// Walk lines, stripping trailing white space and adding to list.
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for _, l := range cl {
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// remove /* and */ lines
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if comment_junk.MatchString(l) {
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continue;
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// Strip trailing white space
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m := len(l);
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for m > 0 && (l[m-1] == ' ' || l[m-1] == '\n' || l[m-1] == '\t' || l[m-1] == '\r') {
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m--;
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}
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l = l[0 : m];
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// strip trailing white space
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m := trailing_whitespace.ExecuteString(l);
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if len(m) > 0 {
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l = l[0 : m[1]];
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}
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// strip leading comment markers
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m = comment_markers.ExecuteString(l);
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if len(m) > 0 {
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l = l[m[1] : len(l)];
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}
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cl[w] = l;
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w++;
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}
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cl = cl[0:w];
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// Add this comment to total list.
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for _, l := range cl {
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// Add to list.
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n := len(lines);
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if n+1 >= cap(lines) {
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newlines := make([]string, n, 2*cap(lines));
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