1 files changed, 230 insertions, 0 deletions
diff --git a/demo/DemoAppCodeGen/functionDefinitionExtract.h b/demo/DemoAppCodeGen/functionDefinitionExtract.h
new file mode 100644
index 0000000..ca08253
--- /dev/null
+++ b/demo/DemoAppCodeGen/functionDefinitionExtract.h
@@ -0,0 +1,230 @@
+/*
+* Copyright (c) 2014-2017, NVIDIA CORPORATION.  All rights reserved.
+*
+* NVIDIA CORPORATION and its licensors retain all intellectual property
+* and proprietary rights in and to this software, related documentation
+* and any modifications thereto.  Any use, reproduction, disclosure or
+* distribution of this software and related documentation without an express
+* license agreement from NVIDIA CORPORATION is strictly prohibited.
+*/
+
+#pragma once
+
+struct StrHeap
+{
+	char* data;
+	unsigned int size;
+	unsigned int allocIdx;
+};
+
+StrHeap allocateStrHeap(const char** definitions, unsigned int numFunctions)
+{
+	unsigned int count = 0u;
+	for (unsigned int functionIdx = 0u; functionIdx < numFunctions; functionIdx++)
+	{
+		count += (unsigned int)strlen(definitions[functionIdx]);
+	}
+
+	// offset count to cover null terminators
+	count += numFunctions * (2 * maxFunctionParams + 1 + 1);
+
+	StrHeap heap = {};
+	heap.data = (char*)malloc(count);
+	heap.size = count;
+	heap.allocIdx = 0u;
+	return heap;
+}
+
+void freeStrHeap(StrHeap* heap)
+{
+	free(heap->data);
+	heap->data = nullptr;
+	heap->size = 0u;
+	heap->allocIdx = 0u;
+}
+
+inline bool isSpace(char c)
+{
+	return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == '\f' || c == '\v';
+}
+
+inline bool isAlphaNum(char c)
+{
+	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || (c == '_');
+}
+
+void skipSpace(unsigned int* readIdx, const char* definition)
+{
+	while (definition[*readIdx] != '\0')
+	{
+		if (isSpace(definition[*readIdx]))
+		{
+			*readIdx = *readIdx + 1;
+		}
+		else
+		{
+			break;
+		}
+	}
+}
+
+void findChar(unsigned int* readIdx, const char* definition, char c)
+{
+	while (definition[*readIdx] != '\0')
+	{
+		if (definition[*readIdx] == c)
+		{
+			break;
+		}
+		else
+		{
+			*readIdx = *readIdx + 1;
+		}
+	}
+}
+
+unsigned int findParamDelimiter(unsigned int readIdx, const char* definition)
+{
+	while (definition[readIdx] != '\0')
+	{
+		if (definition[readIdx] == ',' || definition[readIdx] == ')')
+		{
+			return readIdx;
+		}
+		else
+		{
+			readIdx = readIdx + 1;
+		}
+	}
+	return readIdx;
+}
+
+unsigned int reverseFindAlphaNum(unsigned int maxReadIdx, const char* definition)
+{
+	int readIdx = (int)maxReadIdx;
+	readIdx--;
+	bool hitAlphaNum = false;
+	while (readIdx >= 0)
+	{
+		if (isAlphaNum(definition[readIdx]))
+		{
+			hitAlphaNum = true;
+			readIdx--;
+		}
+		else if (definition[readIdx] == '(' || definition[readIdx] == ',')
+		{
+			if (hitAlphaNum)
+			{
+				return (unsigned int)(readIdx + 1);
+			}
+			else
+			{
+				return maxReadIdx;
+			};
+		}
+		else if (isSpace(definition[readIdx]))
+		{
+			if (hitAlphaNum)
+			{
+				return (unsigned int)(readIdx + 1);
+			}
+			else
+			{
+				readIdx--;
+			}
+		}
+		else
+		{
+			break;
+		}
+	}
+	return maxReadIdx;
+}
+
+void extractAlphaNum(StrHeap* heap, const char** dstPtr, unsigned int* readIdx, const char* definition)
+{
+	skipSpace(readIdx, definition);
+
+	*dstPtr = heap->data + heap->allocIdx;
+
+	while (heap->allocIdx < heap->size)
+	{
+		if (isAlphaNum(definition[(*readIdx)]))
+		{
+			heap->data[heap->allocIdx++] = definition[(*readIdx)++];
+		}
+		else
+		{
+			break;
+		}
+	}
+	heap->data[heap->allocIdx++] = '\0';
+}
+
+void extractRegion(StrHeap* heap, const char** dstPtr, unsigned char readIdx, unsigned char maxReadIdx, const char* definition)
+{
+	*dstPtr = heap->data + heap->allocIdx;
+
+	while (heap->allocIdx < heap->size)
+	{
+		if (readIdx < maxReadIdx)
+		{
+			heap->data[heap->allocIdx++] = definition[readIdx++];
+		}
+		else
+		{
+			break;
+		}
+	}
+	heap->data[heap->allocIdx++] = '\0';
+}
+
+Function genFunction(StrHeap* heap, const char* definition)
+{
+	Function function = {};
+
+	unsigned int readIdx = 0u;
+	unsigned int tempReadIdx = 0u;
+
+	unsigned int paramStartReadIdx = readIdx;
+	findChar(&paramStartReadIdx, definition, '(');
+
+	unsigned int methodReadIdx = reverseFindAlphaNum(paramStartReadIdx, definition);
+
+	extractRegion(heap, &function.retType, readIdx, methodReadIdx, definition);
+
+	tempReadIdx = methodReadIdx;
+	extractAlphaNum(heap, &function.method, &tempReadIdx, definition);
+
+	readIdx = paramStartReadIdx;
+
+	function.numParams = 0;
+	while (function.numParams < maxFunctionParams)
+	{
+		unsigned int maxReadIdx = findParamDelimiter(readIdx, definition);
+
+		unsigned int instNameReadIdx = reverseFindAlphaNum(maxReadIdx, definition);
+
+		// break if no name found
+		if (instNameReadIdx == maxReadIdx)
+		{
+			break;
+		}
+
+		FunctionParams funcParams = {};
+
+		// extract type name, found on interval readIdx to instNameReadIdx
+		extractRegion(heap, &funcParams.typeName, readIdx + 1, instNameReadIdx, definition);
+
+		// extract inst name, found on interval instNameReadIdx to maxReadIdx
+		tempReadIdx = instNameReadIdx;
+		extractAlphaNum(heap, &funcParams.instName, &tempReadIdx, definition);
+
+		// advance read index
+		readIdx = maxReadIdx + 1;
+
+		function.params[function.numParams++] = funcParams;
+	}
+
+	return function;
+}
+\ No newline at end of file