This adds control of Stream::parseInt/float lookahead.

Its default is SKIP_ALL which reflects previous versions.
However SKIP_NONE, and SKIP_WHITESPACE can refine this behaviour.

A parameter used in the protected overloads of parseInt/Float has been
changed from `skipChar` to `ignore`.

Author: Chris--A

cores/arduino/Stream.cpp

@@ -54,7 +54,7 @@ int Stream::timedPeek()
 
 // returns peek of the next digit in the stream or -1 if timeout
 // discards non-numeric characters
-int Stream::peekNextDigit( bool detectDecimal )
+int Stream::peekNextDigit(LookaheadMode lookahead, bool detectDecimal )
 {
   int c;
   while (1) {
@@ -65,6 +65,17 @@ int Stream::peekNextDigit( bool detectDecimal )
         c >= '0' && c <= '9' ||
         detectDecimal && c == '.') return c;
 
+    switch( lookahead ){
+        case SKIP_NONE: return -1; // Fail code.
+        case SKIP_WHITESPACE:
+            switch( c ){
+                case ' ':
+                case '\t':
+                case '\r':
+                case '\n': break;
+                default: return -1; // Fail code.
+            }
+    }
     read();  // discard non-numeric
   }
 }
@@ -114,35 +125,35 @@ bool Stream::findUntil(char *target, size_t targetLen, char *terminator, size_t
 // returns the first valid (long) integer value from the current position.
 // initial characters that are not digits (or the minus sign) are skipped
 // function is terminated by the first character that is not a digit.
-long Stream::parseInt()
+long Stream::parseInt(LookaheadMode lookahead)
 {
-  return parseInt(NO_SKIP_CHAR); // terminate on first non-digit character (or timeout)
+  return parseInt(lookahead, NO_SKIP_CHAR); // terminate on first non-digit character (or timeout)
 }
 
-// as above but a given skipChar is ignored
+// as above but 'ignore' is ignored
 // this allows format characters (typically commas) in values to be ignored
-long Stream::parseInt(char skipChar)
+long Stream::parseInt(LookaheadMode lookahead, char ignore)
 {
   bool isNegative = false;
   long value = 0;
   int c;
 
-  c = peekNextDigit(false);
+  c = peekNextDigit(lookahead, false);
   // ignore non numeric leading characters
   if(c < 0)
     return 0; // zero returned if timeout
 
   do{
-    if(c == skipChar)
-      ; // ignore this charactor
+    if(c == ignore)
+      ; // ignore this character
     else if(c == '-')
       isNegative = true;
     else if(c >= '0' && c <= '9')        // is c a digit?
       value = value * 10 + c - '0';
     read();  // consume the character we got with peek
     c = timedPeek();
   }
-  while( (c >= '0' && c <= '9') || c == skipChar );
+  while( (c >= '0' && c <= '9') || c == ignore );
 
   if(isNegative)
     value = -value;
@@ -151,27 +162,27 @@ long Stream::parseInt(char skipChar)
 
 
 // as parseInt but returns a floating point value
-float Stream::parseFloat()
+float Stream::parseFloat(LookaheadMode lookahead)
 {
-  return parseFloat(NO_SKIP_CHAR);
+  return parseFloat(lookahead, NO_SKIP_CHAR);
 }
 
-// as above but the given skipChar is ignored
+// as above but the given ignore is ignored
 // this allows format characters (typically commas) in values to be ignored
-float Stream::parseFloat(char skipChar){
+float Stream::parseFloat(LookaheadMode lookahead, char ignore){
   bool isNegative = false;
   bool isFraction = false;
   long value = 0;
   char c;
   float fraction = 1.0;
 
-  c = peekNextDigit(true);
+  c = peekNextDigit(lookahead, true);
     // ignore non numeric leading characters
   if(c < 0)
     return 0; // zero returned if timeout
 
   do{
-    if(c == skipChar)
+    if(c == ignore)
       ; // ignore
     else if(c == '-')
       isNegative = true;
@@ -185,7 +196,7 @@ float Stream::parseFloat(char skipChar){
     read();  // consume the character we got with peek
     c = timedPeek();
   }
-  while( (c >= '0' && c <= '9')  || c == '.' && !isFraction || c == skipChar );
+  while( (c >= '0' && c <= '9')  || c == '.' && !isFraction || c == ignore );
 
   if(isNegative)
     value = -value;

cores/arduino/Stream.h

@@ -28,21 +28,30 @@
 // compatability macros for testing
 /*
 #define   getInt()            parseInt()
-#define   getInt(skipChar)    parseInt(skipchar)
+#define   getInt(ignore)    parseInt(ignore)
 #define   getFloat()          parseFloat()
-#define   getFloat(skipChar)  parseFloat(skipChar)
+#define   getFloat(ignore)  parseFloat(ignore)
 #define   getString( pre_string, post_string, buffer, length)
 readBytesBetween( pre_string, terminator, buffer, length)
 */
 
+// This enumeration provides the lookahead options for parseInt(), parseFloat()
+// The rules set out here are used until either the first valid character is found
+// or a time out occurs due to lack of input.
+enum LookaheadMode{
+    SKIP_ALL,       // All invalid characters are ignored.
+    SKIP_NONE,      // Nothing is skipped, and the stream is not touched unless the first waiting character is valid.
+    SKIP_WHITESPACE // Only tabs, spaces, line feeds & carriage returns are skipped.
+};
+
 class Stream : public Print
 {
   protected:
     unsigned long _timeout;      // number of milliseconds to wait for the next char before aborting timed read
     unsigned long _startMillis;  // used for timeout measurement
     int timedRead();    // private method to read stream with timeout
     int timedPeek();    // private method to peek stream with timeout
-    int peekNextDigit( bool detectDecimal ); // returns the next numeric digit in the stream or -1 if timeout
+    int peekNextDigit(LookaheadMode lookahead, bool detectDecimal); // returns the next numeric digit in the stream or -1 if timeout
 
   public:
     virtual int available() = 0;
@@ -71,11 +80,11 @@ class Stream : public Print
   bool findUntil(uint8_t *target, size_t targetLen, char *terminate, size_t termLen) {return findUntil((char *)target, targetLen, terminate, termLen); }
 
 
-  long parseInt(); // returns the first valid (long) integer value from the current position.
+  long parseInt(LookaheadMode lookahead = SKIP_ALL); // returns the first valid (long) integer value from the current position.
   // initial characters that are not digits (or the minus sign) are skipped
   // integer is terminated by the first character that is not a digit.
 
-  float parseFloat();               // float version of parseInt
+  float parseFloat(LookaheadMode lookahead = SKIP_ALL);               // float version of parseInt
 
   size_t readBytes( char *buffer, size_t length); // read chars from stream into buffer
   size_t readBytes( uint8_t *buffer, size_t length) { return readBytes((char *)buffer, length); }
@@ -92,11 +101,13 @@ class Stream : public Print
   String readStringUntil(char terminator);
 
   protected:
-  long parseInt(char skipChar); // as above but the given skipChar is ignored
-  // as above but the given skipChar is ignored
+  long parseInt(char ignore) { return parseInt(SKIP_ALL, ignore); }
+  long parseInt(LookaheadMode lookahead, char ignore); // as above but the given ignore is ignored
+  // as above but 'ignore' is ignored
   // this allows format characters (typically commas) in values to be ignored
-
-  float parseFloat(char skipChar);  // as above but the given skipChar is ignored
+  
+  float parseFloat(char ignore) { return parseFloat(SKIP_ALL, ignore); }  
+  float parseFloat(LookaheadMode lookahead, char ignore);  // as above but the given ignore is ignored
 
   struct MultiTarget {
     const char *str;  // string you're searching for