1 files changed, 165 insertions, 0 deletions
diff --git a/interface/input/parsers.py b/interface/input/parsers.py
new file mode 100755
index 0000000..5e53e03
--- /dev/null
+++ b/interface/input/parsers.py
@@ -0,0 +1,165 @@
+def parse_interval(s):
+    if not s:
+        return None, s
+    dash = False
+    init_s = s
+    buff = ""
+    r = [-1, -1]
+    i = 0
+    while s:
+        if not dash and s[0] == '-':
+            if buff:
+                r[0] = int(buff)
+                buff = ""
+            dash = True
+        elif s[0] in "0123456789":
+            buff += s[0]
+        else:
+            break
+        s = s[1:]
+        i += 1
+
+    if buff:
+        r[1 if dash else 0] = int(buff)
+    elif not buff and not dash:
+        return None, s, None
+    
+    if not dash:
+        r[1] = r[0]
+
+    return tuple(r), s, init_s[:i]
+
+def parse_range(s):
+    if not s:
+        return None, s, None
+
+    rs = []
+    disp = []
+    tc = False
+    while s:
+        r, s, d = parse_interval(s)
+        if r is None:
+            break
+        tc = False
+        rs.append(r)
+        disp.append(d)
+        if s and s[0] == ',':
+            s = s[1:]
+            tc = True
+        else:
+            break
+
+    if not rs:
+        return None, s, None
+    return tuple(rs), s, ", ".join(disp) + (", " if tc else "")
+
+def parse_channelrange(s):
+    if not s:
+        return None, s, None
+
+    f, s, d1 = parse_range(s)
+    if f is None:
+        return None, s, None
+    elif not s or s[0] != ';':
+        return (f, ((-1,-1),)), s, d1
+
+
+    s = s[1:]
+    c, s, d2 = parse_range(s)
+    if c is None:
+        return (f, ((-1, -1),)), s, d1 + "; "
+
+    return (f, c), s, d1+"; "+d2
+
+def parse_value(s):
+    if not s:
+        return None, s
+    
+    buff = ""
+    while s:
+        if s[0] in "0123456789" and int(buff+s[0]) < 256:
+            buff += s[0]
+            s = s[1:]
+        else:
+            break
+
+    return (None if not buff else int(buff)), s, buff
+
+def parse_num(s):
+    if not s:
+        return None, s
+    
+    buff = ""
+    while s:
+        if s[0] in "0123456789":
+            buff += s[0]
+            s = s[1:]
+        else:
+            break
+
+    return (None if not buff else int(buff)), s, buff
+
+def make_parse_letter(letter, display):
+    def inner(s):
+        if not s or s[0] != letter:
+            return None, s, None
+        return True, s[1:], display
+
+    return inner
+
+def parse_null(s):
+    return True, s, ""
+
+def parse_string(s):
+    if not s:
+        return None, s, None
+
+    buff = ""
+    while s:
+        if s[0] != ' ':
+            buff += s[0]
+            s = s[1:]
+        else:
+            if not buff:
+                return None, s, None
+            break
+
+    return buff, s, buff
+
+def parse_quotedstring(s):
+    if not s:
+        return None, s, None
+
+    if s[0] != "'":
+        return None, s, None 
+    s = s[1:]
+
+    buff = ""
+    bs = False
+    while s:
+        if s[0] == '\\':
+            buff += s[0]
+            bs = not bs
+        elif s[0] == "'":
+            if bs:
+                buff += s[0]
+                bs = False
+            else:
+                s = s[1:]
+                break
+        else:
+            buff += s[0]
+            bs = False
+        s = s[1:]
+    else:
+        return buff, s, "'"+buff
+    return buff, s, "'"+buff+"'"
+
+PARSE_MAP = {
+    "$channel_range": parse_channelrange,
+    "$value": parse_value,
+    "$null": parse_null,
+    "$string": parse_string,
+    "$num": parse_num,
+    "$quoted_string": parse_quotedstring,
+}