From 1fba999bec5a589e4785594fb1a6fbfab9129097 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Thu, 7 Dec 2017 12:12:59 +0100
Subject: o A start of a kicad_pcb parser.

---
 src/ee/kicad/__init__.py         |   8 ++-
 src/ee/kicad/_parse_kicad_pcb.py | 146 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 151 insertions(+), 3 deletions(-)
 create mode 100644 src/ee/kicad/_parse_kicad_pcb.py

(limited to 'src')

diff --git a/src/ee/kicad/__init__.py b/src/ee/kicad/__init__.py
index d949fbe..efc20a2 100644
--- a/src/ee/kicad/__init__.py
+++ b/src/ee/kicad/__init__.py
@@ -4,14 +4,16 @@ from ee import EeException
 from ee.kicad.read_schematic import read_schematic, read_schematics
 from ee.kicad.to_bom import to_bom, to_bom_xml
 from .model import *
+from ._parse_kicad_pcb import parse_kicad_pcb
 
 __all__ = [
-    "Position",
-    "ComponentField",
     "Component",
-    "Schematic",
+    "ComponentField",
+    "parse_kicad_pcb",
+    "Position",
     "read_schematic",
     "read_schematics",
+    "Schematic",
     "to_bom",
     "to_bom_xml",
     "to_pandas",
diff --git a/src/ee/kicad/_parse_kicad_pcb.py b/src/ee/kicad/_parse_kicad_pcb.py
new file mode 100644
index 0000000..5ea4d1b
--- /dev/null
+++ b/src/ee/kicad/_parse_kicad_pcb.py
@@ -0,0 +1,146 @@
+EVENT_START = 1
+EVENT_END = 2
+EVENT_LPAREN = 3
+EVENT_RPAREN = 4
+EVENT_TEXT = 5
+
+def state_to_str(s):
+    if s == EVENT_START:
+        return "EVENT_START"
+    if s == EVENT_END:
+        return "EVENT_END"
+    if s == EVENT_LPAREN:
+        return "EVENT_LPAREN"
+    if s == EVENT_RPAREN:
+        return "EVENT_RPAREN"
+    if s == EVENT_TEXT:
+        return "EVENT_TEXT"
+    return "UNKNOWN STATE"
+
+def parse_kicad_pcb(path):
+    class state(object):
+        def __init__(self):
+            self.f = open(path, "r")#, 128 * 1024)
+            self.state = EVENT_START
+            self.buffer = []
+
+        def text(self):
+            return self._text
+
+        def close(self):
+            if self.f:
+                f = self.f
+                self.f = None
+                f.close()
+
+        def _read_c(self):
+            # TODO: count lines and characters
+            if self.buffer:
+                c = self.buffer[0]
+                while c == '\n':
+                    del self.buffer[0]
+                    c = self.buffer[0]
+                return c
+
+            c = self.f.read(1024)
+            if not c:
+                return c
+
+            self.buffer.extend(c)
+            return self._read_c()
+
+#            if self.buffer:
+#                c = self.buffer[0]
+#                del self.buffer[0]
+#                return c
+#
+#            c = self.f.read(1)
+#            while c and c == '\n':
+#                c = self.f.read(1)
+#            return c
+
+        def _unread(self, s):
+            for c in s:
+                self.buffer.append(c)
+#            print("unreading: '{}', buffer={}".format(s, str(self.buffer)))
+
+        def _read_token(self):
+            s = ""
+            while True:
+                c = self._read_c()
+
+                if not c:
+                    return s if s else None
+
+                if c == " ":
+                    # Ignore leading blanks
+                    if not s:
+                        continue
+
+                if c == "(" or c == ")":
+                    if not s:
+                        return c
+                    self._unread(c)
+                    return s.rstrip()
+
+                if c == " ":
+                    return s
+
+                if c == "\"":
+                    while c:
+                        c = self._read_c()
+
+                        if c == "\"":
+                          break
+
+                        s += c
+                    return s
+                s += c
+
+            return s.rstrip()
+
+        def next(self):
+            s = self.state
+#            print("next: current state={}, buffer={}".format(self.state_to_str(s), self.buffer))
+            self._text = None
+            if s == EVENT_END:
+                raise Exception("Invalid state, state=END")
+
+            token = self._read_token()
+#            print("token={}".format(token))
+
+            if token is None:
+                self.state = EVENT_END
+                self.close()
+                return (EVENT_END, None)
+
+            if token == "(":
+                self.state = EVENT_LPAREN
+                return (EVENT_LPAREN, None)
+            if token == ")":
+                self.state = EVENT_RPAREN
+                return (EVENT_RPAREN, None)
+
+            self._text = token
+            self.state = EVENT_TEXT
+            return (EVENT_TEXT, token)
+
+    s = state()
+    (event, token) = s.next()
+    while event != EVENT_END:
+        yield (event, token)
+        (event, token) = s.next()
+
+#indent = 0
+#for (event_type, text) in parse_kicad_pcb("alpha.kicad_pcb"):
+#    if event_type == EVENT_LPAREN:
+#        prefix = " " * indent
+#        indent = indent + 1
+#        print(prefix + "(")
+#    elif event_type == EVENT_RPAREN:
+#        indent = indent - 1
+#        prefix = " " * indent
+#        print(prefix + ")")
+#    elif event_type == EVENT_TEXT:
+#        prefix = " " * indent
+#        print("{}{}".format(prefix, text))
-- 
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