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tokenise_keep.go
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tokenise_keep.go
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// vi: sw=4 ts=4:
/*
---------------------------------------------------------------------------
Copyright (c) 2013-2015 AT&T Intellectual Property
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at:
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
---------------------------------------------------------------------------
*/
package token
import (
"strings";
)
/*
---------------------------------------------------------------------------------------
Mnemonic: tokenise_keep (split and keep separators as individual tokens)
Date: 22 Apr 2012
Author: E. Scott Daniels
Mods: 01 May 2012 : Added escape character support
03 Feb 2015 : Removed unreachable code.
07 Jun 2018 : Remove unreachable code (keep vet happy)
---------------------------------------------------------------------------------------
*/
/*
Tokensise_keep takes a string and slices it into tokens using the characters in sepchrs
as the breaking points. The separation characters are returned as
individual tokens in the list. Separater characters escaped with a backslant
are NOT treated like separators.
The return values are ntokens (int) and the list of tokens and separators.
*/
func Tokenise_keep( buf string, sepchrs string ) (int, []string) {
var (
tokens []string;
idx int;
)
idx = 0;
tokens = make( []string, 2048 );
sepchrs += "\\"; // escape character is a separator
subbuf := buf;
tokens[idx] = ""; // prime the first one
for {
if i := strings.IndexAny( subbuf, sepchrs ); i >= 0 {
if subbuf[i:i+1] == "\\" { // next character is escaped
tokens[idx] += subbuf[0:i]; // add everything before slant
tokens[idx] += subbuf[i+1:i+2]; // add escaped char
subbuf = subbuf[i+2:]; // advance past escaped char
} else {
if i > 0 { // characters before the sep, capture them
tokens[idx] += subbuf[0:i]; // add everything before separator
idx++;
} else {
if tokens[idx] != "" { // finish previous token
idx++;
}
}
tokens[idx] = subbuf[i:i+1]; // keep the sep as a separate token
idx++;
subbuf = subbuf[i+1:]; // advance past
tokens[idx] = ""; // initialise next when advancing idx
}
} else { // no more seps, just complete the list with remaining stuff and return
tokens[idx] = subbuf[:len( subbuf )]; // capture last bit in tokens and go
return idx+1, tokens[0:idx+1];
}
if len( subbuf ) < 1 {
return idx, tokens[0:idx];
}
}
}