35 lines
946 B
Smalltalk
35 lines
946 B
Smalltalk
"
|
|
A PPStartOfLogicalLineParser is that does not fail, if the stream position is at the first non-blank character of a line. It does not consume anything.
|
|
|
|
"
|
|
Class {
|
|
#name : 'PPStartOfLogicalLineParser',
|
|
#superclass : 'PPParser',
|
|
#category : 'PetitParser-Parsers'
|
|
}
|
|
|
|
{ #category : 'testing' }
|
|
PPStartOfLogicalLineParser >> isBlank: character [
|
|
^ (character == Character space or: [character == Character tab])
|
|
|
|
]
|
|
|
|
{ #category : 'parsing' }
|
|
PPStartOfLogicalLineParser >> parseOn: aPPContext [
|
|
aPPContext peek isAlphaNumeric ifFalse: [
|
|
^ PPFailure message: 'Start of logical line expected' context: aPPContext
|
|
].
|
|
|
|
aPPContext isStartOfLine ifTrue: [ ^ #startOfLogicalLine ].
|
|
|
|
|
|
[ aPPContext position ~= 0 ] whileTrue: [
|
|
aPPContext back.
|
|
(self isBlank: aPPContext peek) ifFalse: [
|
|
^ PPFailure message: 'Start of logical line expected' context: aPPContext
|
|
].
|
|
aPPContext isStartOfLine ifTrue: [ ^ #startOfLogicalLine ].
|
|
]
|
|
|
|
]
|