diff options
Diffstat (limited to 'src/interp/lexing.boot')
| -rw-r--r-- | src/interp/lexing.boot | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/interp/lexing.boot b/src/interp/lexing.boot index 992239e3..712b1927 100644 --- a/src/interp/lexing.boot +++ b/src/interp/lexing.boot @@ -372,6 +372,18 @@ ungetTokens() == coreError '"How many tokens do you think you have?" +++ Returns length of X if X matches initial segment of IN-STREAM. +++ Otherwise, return nil. +matchString x == + ungetTokens() + skipBlankChars() + not linePastEnd? $spadLine and currentChar() ~= nil => + nx := #x + buf := lineBuffer $spadLine + idx := lineCurrentIndex $spadLine + nx + idx > #buf => nil + and/[stringChar(x,i) = stringChar(buf,idx + i) for i in 0..nx-1] and nx + nil --% --% Stack abstract datatype. |