2 files changed, 296 insertions, 0 deletions
diff --git a/pyGHDL/dom/formatting/__init__.py b/pyGHDL/dom/formatting/__init__.py
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/pyGHDL/dom/formatting/__init__.py
diff --git a/pyGHDL/dom/formatting/prettyprint.py b/pyGHDL/dom/formatting/prettyprint.py
new file mode 100644
index 000000000..a64f2a4f5
--- /dev/null
+++ b/pyGHDL/dom/formatting/prettyprint.py
@@ -0,0 +1,296 @@
+from typing import List, Union
+
+from pydecor import export
+
+from pyGHDL.dom.Object import Constant, Signal
+from pyVHDLModel.VHDLModel import GenericInterfaceItem, Expression, Direction, Mode, NamedEntity, PortInterfaceItem, BinaryExpression, IdentityExpression, \
+    UnaryExpression
+
+from pyGHDL import GHDLBaseException
+from pyGHDL.dom.Misc import Document
+from pyGHDL.dom.DesignUnit import Entity, Architecture, Package, PackageBody, Configuration, Context
+from pyGHDL.dom.InterfaceItem import GenericConstantInterfaceItem, PortSignalInterfaceItem
+from pyGHDL.dom.Symbol import SimpleSubTypeSymbol, ConstrainedSubTypeSymbol, SimpleObjectSymbol
+from pyGHDL.dom.Literal import IntegerLiteral, CharacterLiteral, FloatingPointLiteral
+
+from pyGHDL.dom.Expression import SubtractionExpression, AdditionExpression, MultiplyExpression, DivisionExpression, InverseExpression, AbsoluteExpression, \
+    NegationExpression, ExponentiationExpression
+
+StringBuffer = List[str]
+
+DirectionTranslation = {
+    Direction.To:     "to",
+    Direction.DownTo: "downto"
+}
+
+ModeTranslation = {
+    Mode.In:      "in",
+    Mode.Out:     "out",
+    Mode.InOut:   "inout",
+    Mode.Buffer:  "buffer",
+    Mode.Linkage: "linkage"
+}
+
+UnaryExpressionTranslation = {
+    IdentityExpression:    " +",
+    NegationExpression:    " -",
+    InverseExpression:     "not ",
+    AbsoluteExpression:    "abs ",
+}
+
+BinaryExpressionTranslation = {
+    AdditionExpression:       " + ",
+    SubtractionExpression:    " - ",
+    MultiplyExpression:       " * ",
+    DivisionExpression:       " / ",
+    ExponentiationExpression: "**"
+}
+
+@export
+class PrettyPrintException(GHDLBaseException):
+    pass
+
+@export
+class PrettyPrint:
+    # _buffer: StringBuffer
+    #
+    # def __init__(self):
+    #     self._buffer = []
+
+    def formatDocument(self, document: Document, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+        buffer.append("{prefix}Document '{doc!s}':".format(doc=document.Path, prefix=prefix))
+        buffer.append("{prefix}  Entities:".format(prefix=prefix))
+        for entity in document.Entities:
+            for line in self.formatEntity(entity, level+1):
+                buffer.append(line)
+        buffer.append("{prefix}  Architectures:".format(prefix=prefix))
+        for architecture in document.Architectures:
+            for line in self.formatArchitecture(architecture, level+1):
+                buffer.append(line)
+        buffer.append("{prefix}  Packages:".format(prefix=prefix))
+        for package in document.Packages:
+            for line in self.formatPackage(package, level+1):
+                buffer.append(line)
+        buffer.append("{prefix}  PackageBodies:".format(prefix=prefix))
+        for packageBodies in document.PackageBodies:
+            for line in self.formatPackageBody(packageBodies, level+1):
+                buffer.append(line)
+        buffer.append("{prefix}  Configurations:".format(prefix=prefix))
+        for configuration in document.Configurations:
+            for line in self.formatConfiguration(configuration, level+1):
+                buffer.append(line)
+        buffer.append("{prefix}  Contexts:".format(prefix=prefix))
+        for context in document.Contexts:
+            for line in self.formatContext(context, level+1):
+                buffer.append(line)
+
+        return buffer
+
+    def formatEntity(self, entity: Entity, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+        buffer.append("{prefix}- {name}".format(name=entity.Name, prefix=prefix))
+        buffer.append("{prefix}  Generics:".format(prefix=prefix))
+        for generic in entity.GenericItems:
+            for line in self.formatGeneric(generic, level + 1):
+                buffer.append(line)
+        buffer.append("{prefix}  Ports:".format(prefix=prefix))
+        for port in entity.PortItems:
+            for line in self.formatPort(port, level + 1):
+                buffer.append(line)
+        buffer.append("{prefix}  Declared:".format(prefix=prefix))
+        for item in entity.DeclaredItems:
+            for line in self.formatDeclaredItems(item, level + 1):
+                buffer.append(line)
+
+        return buffer
+
+    def formatArchitecture(self, architecture: Architecture, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+        buffer.append("{prefix}- {name}".format(name=architecture.Name, prefix=prefix))
+        buffer.append("{prefix}  Declared:".format(prefix=prefix))
+        for item in architecture.DeclaredItems:
+            for line in self.formatDeclaredItems(item, level + 2):
+                buffer.append(line)
+
+        return buffer
+
+    def formatPackage(self, package: Package, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+        buffer.append("{prefix}- {name}".format(name=package.Name, prefix=prefix))
+        buffer.append("{prefix}  Declared:".format(prefix=prefix))
+        for item in package.DeclaredItems:
+            for line in self.formatDeclaredItems(item, level + 1):
+                buffer.append(line)
+
+        return buffer
+
+    def formatPackageBody(self, packageBody: PackageBody, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+        buffer.append("{prefix}- {name}".format(name=packageBody.Name, prefix=prefix))
+        buffer.append("{prefix}  Declared:".format(prefix=prefix))
+        for item in packageBody.DeclaredItems:
+            for line in self.formatDeclaredItems(item, level + 1):
+                buffer.append(line)
+
+        return buffer
+
+    def formatConfiguration(self, configuration: Configuration, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+        buffer.append("{prefix}- {name}".format(name=configuration.Name, prefix=prefix))
+
+        return buffer
+
+    def formatContext(self, context: Context, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+        buffer.append("{prefix}- {name}".format(name=context.Name, prefix=prefix))
+
+        return buffer
+
+    def formatGeneric(self, generic: Union[NamedEntity, GenericInterfaceItem], level: int = 0) -> StringBuffer:
+        if isinstance(generic, GenericConstantInterfaceItem):
+            return self.formatGenericConstant(generic, level)
+        else:
+            raise PrettyPrintException("Unhandled generic kind for generic '{name}'.".format(name=generic.Name))
+
+    def formatPort(self, port: Union[NamedEntity, PortInterfaceItem], level: int = 0) -> StringBuffer:
+        if isinstance(port, PortSignalInterfaceItem):
+            return self.formatPortSignal(port, level)
+        else:
+            raise PrettyPrintException("Unhandled port kind for port '{name}'.".format(name=port.Name))
+
+    def formatGenericConstant(self, generic: GenericConstantInterfaceItem, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+        subType = generic.SubType
+        if isinstance(subType, SimpleSubTypeSymbol):
+            buffer.append(
+                "{prefix}  - {name} : {mode} {type}".format(
+                    prefix=prefix,
+                    name=generic.Name,
+                    mode=ModeTranslation[generic.Mode],
+                    type=subType.SymbolName
+                )
+            )
+        elif isinstance(subType, ConstrainedSubTypeSymbol):
+            buffer.append(
+                "{prefix}  - {name} : {mode} {type}({constraints})".format(
+                    prefix=prefix,
+                    name=generic.Name,
+                    mode=ModeTranslation[generic.Mode],
+                    type=subType.SymbolName,
+                    constraints=", ".join(
+                        ["{left} {dir} {right}".format(
+                            left=self.formatExpression(constraint.Range.LeftBound),
+                            right=self.formatExpression(constraint.Range.RightBound),
+                            dir=DirectionTranslation[constraint.Range.Direction])
+                                for constraint in subType.Constraints])
+                )
+            )
+        else:
+            raise PrettyPrintException("Unhandled constraint kind for generic '{name}'.".format(name=generic.Name))
+
+        return buffer
+
+    def formatPortSignal(self, port: PortSignalInterfaceItem, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+
+        buffer.append(
+            "{prefix}  - {name} : {mode} {subtypeindication}".format(
+                prefix=prefix,
+                name=port.Name,
+                mode=ModeTranslation[port.Mode],
+                subtypeindication=self.formatSubtypeIndication(port.SubType, "port", port.Name)
+            )
+        )
+
+        return buffer
+
+    def formatDeclaredItems(self, item, level: int = 0) -> StringBuffer:
+        buffer = []
+        prefix = "  " * level
+
+        if isinstance(item, Constant):
+            buffer.append(
+                "{prefix}- constant {name} : {subtype} := {expr}".format(
+                    prefix=prefix,
+                    name=item.Name,
+                    subtype=self.formatSubtypeIndication(item.SubType, "constant", item.Name),
+                    expr=self.formatExpression(item.DefaultExpression)
+                )
+            )
+        elif isinstance(item, Signal):
+            buffer.append(
+                "{prefix}- signal {name} : {subtype}{initValue}".format(
+                    prefix=prefix,
+                    name=item.Name,
+                    subtype=self.formatSubtypeIndication(item.SubType, "signal", item.Name),
+                    initValue=" := {expr}".format(
+                        expr=self.formatExpression(item.DefaultExpression)
+                    ) if item.DefaultExpression is not None else ""
+                )
+            )
+        else:
+            raise PrettyPrintException("Unhandled declared item kind.")
+
+        return buffer
+
+    def formatSubtypeIndication(self, subTypeIndication, entity: str, name: str) -> str:
+        if isinstance(subTypeIndication, SimpleSubTypeSymbol):
+            return "{type}".format(type=subTypeIndication.SymbolName)
+        elif isinstance(subTypeIndication, ConstrainedSubTypeSymbol):
+            constraints = ", ".join(
+                ["{left} {dir} {right}".format(
+                    left=self.formatExpression(constraint.Range.LeftBound),
+                    right=self.formatExpression(constraint.Range.RightBound),
+                    dir=DirectionTranslation[constraint.Range.Direction]
+                ) for constraint in subTypeIndication.Constraints]
+            )
+
+            return "{type}({constraints})".format(
+                type=subTypeIndication.SymbolName,
+                constraints=constraints
+            )
+        else:
+            raise PrettyPrintException("Unhandled constraint kind for {entity} '{name}'.".format(entity=entity, name=name))
+
+    def formatExpression(self, expression: Expression) -> str:
+        if isinstance(expression, SimpleObjectSymbol):
+            return "{name}".format(name=expression.SymbolName)
+        elif isinstance(expression, IntegerLiteral):
+            return "{value}".format(value=expression.Value)
+        elif isinstance(expression, FloatingPointLiteral):
+            return "{value}".format(value=expression.Value)
+        elif isinstance(expression, CharacterLiteral):
+            return "'{value}'".format(value=expression.Value)
+        elif isinstance(expression, UnaryExpression):
+            try:
+                operator = UnaryExpressionTranslation[type(expression)]
+            except KeyError:
+                raise PrettyPrintException("Unhandled operator for unary expression.")
+
+            return "{operator}{operand}".format(
+                operand=self.formatExpression(expression.Operand),
+                operator=operator
+            )
+        elif isinstance(expression, BinaryExpression):
+            try:
+                operator = BinaryExpressionTranslation[type(expression)]
+            except KeyError:
+                raise PrettyPrintException("Unhandled operator for binary expression.")
+
+            return "{left}{operator}{right}".format(
+                left=self.formatExpression(expression.LeftOperand),
+                right=self.formatExpression(expression.RightOperand),
+                operator=operator
+            )
+        else:
+            raise PrettyPrintException("Unhandled expression kind.")