Added SVF grammar parser

Using modgrammar (can be installed with pip)
TODO: PIO, PIOMAP

diff --git a/sim/cocotb/c4m_jtag_svfgrammar.py b/sim/cocotb/c4m_jtag_svfgrammar.py
new file mode 100644 (file)
index 0000000..faf3aeb
--- /dev/null
+++ b/sim/cocotb/c4m_jtag_svfgrammar.py
@@ -0,0 +1,96 @@
+from modgrammar import *
+
+grammar_whitespace_mode = 'explicit'
+grammar_whitespace = WS_NOEOL
+
+class SVFEol(Grammar):
+    grammar = (OPTIONAL(SPACE), EOL)
+    grammar_collapse = True
+
+class SemicolonEol(Grammar):
+    grammar = (OPTIONAL(SPACE), L(";"), SVFEol)
+    grammar_collapse = True
+
+class Integer(Grammar):
+    grammar = WORD("0-9")
+    grammar_collapse = True
+
+class Float(Grammar):
+    grammar = (Integer, (L("."), OPTIONAL(Integer)), OPTIONAL(L("E"), Integer))
+
+class Hexadecimal(Grammar):
+    grammar = (L("("), WORD("0-9A-F"), L(")"))
+    grammar_collapse = True
+
+class StableState(Grammar):
+    grammar = (L("IRPAUSE") | L("DRPAUSE") | L("RESET") | L("IDLE"))
+    grammar_collapse = True
+
+
+class ScanSpec(Grammar):
+    """The specification of Scan In/Scan out data"""
+    grammar = (SPACE, Integer, SPACE,
+               OPTIONAL(L("TDI"), OPTIONAL(SPACE), Hexadecimal),
+               OPTIONAL(OPTIONAL(SPACE), L("TDO"), OPTIONAL(SPACE), Hexadecimal),
+               OPTIONAL(OPTIONAL(SPACE), L("MASK"), OPTIONAL(SPACE), Hexadecimal),
+               OPTIONAL(OPTIONAL(SPACE), L("SMASK"), OPTIONAL(SPACE), Hexadecimal)
+              )
+    grammar_collapse = True
+
+
+class EmptyLine(Grammar):
+    grammar = SVFEol
+
+class Comment(Grammar):
+    grammar = (L("!"), REST_OF_LINE, SVFEol)
+
+class EndDR(Grammar):
+    grammar = (L("ENDDR"), SPACE, StableState, SemicolonEol)
+
+class EndIR(Grammar):
+    grammar = (L("ENDIR"), SPACE, StableState, SemicolonEol)
+
+class Frequency(Grammar):
+    grammar = (L("FREQUENCY"), OPTIONAL(SPACE, Float, OPTIONAL(SPACE), L("HZ")), OPTIONAL(SPACE), SemicolonEol)
+
+class HDR(Grammar):
+    grammar = (L("HDR"), ScanSpec, SemicolonEol)
+
+class HIR(Grammar):
+    grammar = (L("HIR"), ScanSpec, SemicolonEol)
+
+#TODO: PIO, PIOMAP
+
+class Runtest(Grammar):
+    grammar = (
+        L("RUNTEST"),
+        OPTIONAL(SPACE, StableState),
+        OPTIONAL(SPACE, Integer, OPTIONAL(SPACE), (L("TCK") | L("SCK"))),
+        OPTIONAL(SPACE, Float, OPTIONAL(SPACE), L("SEC")),
+        OPTIONAL(SPACE, L("MAXIMUM"), SPACE, Float, OPTIONAL(SPACE), L("SEC")),
+        OPTIONAL(SPACE, L("ENDSTATE"), SPACE, StableState),
+        SemicolonEol
+    )
+
+class SDR(Grammar):
+    grammar = (L("SDR"), ScanSpec, SemicolonEol)
+
+class SIR(Grammar):
+    grammar = (L("SIR"), ScanSpec, SemicolonEol)
+
+class State(Grammar):
+    # TODO: Path to reach state
+    grammar = (L("STATE"), SPACE, StableState, SemicolonEol)
+
+class TDR(Grammar):
+    grammar = (L("TDR"), ScanSpec, SemicolonEol)
+
+class TIR(Grammar):
+    grammar = (L("TIR"), ScanSpec, SemicolonEol)
+
+class Trst(Grammar):
+    grammar = (L("TRST"), SPACE, (L("ON") | L("OFF") | L("Z") | L("ABSENT")), SemicolonEol)
+
+
+class SVFFile(Grammar):
+    grammar = ONE_OR_MORE(EmptyLine | Comment | Trst | EndDR | EndIR | SIR | SDR | Runtest | State)