prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Add "now" to the timestamp detector
  https://github.com/crytic/slither/blob/7cb6cf4870036f780088fa7dfec83ae3220322e2/slither/detectors/operations/block_timestamp.py#L39-L44
  
  This could also warns about the use of `now`
  
  </issue>
  <code>
  [start of slither/detectors/operations/block_timestamp.py]
  1 """
  2     Module detecting dangerous use of block.timestamp
  3 
  4 """
  5 from slither.core.declarations import Function
  6 from slither.analyses.data_dependency.data_dependency import is_tainted, is_dependent
  7 from slither.core.declarations.solidity_variables import (SolidityFunction,
  8                                                           SolidityVariableComposed)
  9 from slither.detectors.abstract_detector import (AbstractDetector,
  10                                                  DetectorClassification)
  11 from slither.slithir.operations import Binary, BinaryType
  12 
  13 
  14 class Timestamp(AbstractDetector):
  15     """
  16     """
  17 
  18     ARGUMENT = 'timestamp'
  19     HELP = 'Dangerous usage of `block.timestamp`'
  20     IMPACT = DetectorClassification.LOW
  21     CONFIDENCE = DetectorClassification.MEDIUM
  22 
  23     WIKI = 'https://github.com/crytic/slither/wiki/Detector-Documentation#block-timestamp'
  24 
  25 
  26     WIKI_TITLE = 'Block timestamp'
  27     WIKI_DESCRIPTION = 'Dangerous usage of `block.timestamp`. `block.timestamp` can be manipulated by miners.'
  28     WIKI_EXPLOIT_SCENARIO = '''"Bob's contract relies on `block.timestamp` for its randomness. Eve is a miner and manipulates `block.timestamp` to exploit Bob's contract.'''
  29     WIKI_RECOMMENDATION = 'Avoid relying on `block.timestamp`.'
  30 
  31     def timestamp(self, func):
  32         """
  33         """
  34 
  35         ret = set()
  36         for node in func.nodes:
  37             if node.contains_require_or_assert():
  38                 for var in node.variables_read:
  39                     if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):
  40                         ret.add(node)
  41             for ir in node.irs:
  42                 if isinstance(ir, Binary) and BinaryType.return_bool(ir.type):
  43                     for var in ir.read:
  44                         if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):
  45                             ret.add(node)
  46         return list(ret)
  47 
  48 
  49     def detect_dangerous_timestamp(self, contract):
  50         """
  51         Args:
  52             contract (Contract)
  53         Returns:
  54             list((Function), (list (Node)))
  55         """
  56         ret = []
  57         for f in [f for f in contract.functions if f.contract_declarer == contract]:
  58             nodes = self.timestamp(f)
  59             if nodes:
  60                 ret.append((f, nodes))
  61         return ret
  62 
  63     def _detect(self):
  64         """
  65         """
  66         results = []
  67 
  68         for c in self.contracts:
  69             dangerous_timestamp = self.detect_dangerous_timestamp(c)
  70             for (func, nodes) in dangerous_timestamp:
  71 
  72                 info = [func, " uses timestamp for comparisons\n"]
  73 
  74                 info += ['\tDangerous comparisons:\n']
  75                 for node in nodes:
  76                     info += ['\t- ', node, '\n']
  77 
  78                 res = self.generate_result(info)
  79 
  80                 results.append(res)
  81 
  82         return results
  83
  [end of slither/detectors/operations/block_timestamp.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/slither/detectors/operations/block_timestamp.py b/slither/detectors/operations/block_timestamp.py
  --- a/slither/detectors/operations/block_timestamp.py
  +++ b/slither/detectors/operations/block_timestamp.py
  @@ -2,15 +2,51 @@
       Module detecting dangerous use of block.timestamp
   
   """
  -from slither.core.declarations import Function
  -from slither.analyses.data_dependency.data_dependency import is_tainted, is_dependent
  -from slither.core.declarations.solidity_variables import (SolidityFunction,
  -                                                          SolidityVariableComposed)
  +from typing import List, Tuple
  +
  +from slither.analyses.data_dependency.data_dependency import is_dependent
  +from slither.core.cfg.node import Node
  +from slither.core.declarations import Function, Contract
  +from slither.core.declarations.solidity_variables import (SolidityVariableComposed, SolidityVariable)
   from slither.detectors.abstract_detector import (AbstractDetector,
                                                    DetectorClassification)
   from slither.slithir.operations import Binary, BinaryType
   
   
  +def _timestamp(func: Function) -> List[Node]:
  +    ret = set()
  +    for node in func.nodes:
  +        if node.contains_require_or_assert():
  +            for var in node.variables_read:
  +                if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):
  +                    ret.add(node)
  +                if is_dependent(var, SolidityVariable('now'), func.contract):
  +                    ret.add(node)
  +        for ir in node.irs:
  +            if isinstance(ir, Binary) and BinaryType.return_bool(ir.type):
  +                for var in ir.read:
  +                    if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):
  +                        ret.add(node)
  +                    if is_dependent(var, SolidityVariable('now'), func.contract):
  +                        ret.add(node)
  +    return list(ret)
  +
  +
  +def _detect_dangerous_timestamp(contract: Contract) -> List[Tuple[Function, List[Node]]]:
  +    """
  +    Args:
  +        contract (Contract)
  +    Returns:
  +        list((Function), (list (Node)))
  +    """
  +    ret = []
  +    for f in [f for f in contract.functions if f.contract_declarer == contract]:
  +        nodes = _timestamp(f)
  +        if nodes:
  +            ret.append((f, nodes))
  +    return ret
  +
  +
   class Timestamp(AbstractDetector):
       """
       """
  @@ -22,51 +58,18 @@
   
       WIKI = 'https://github.com/crytic/slither/wiki/Detector-Documentation#block-timestamp'
   
  -
       WIKI_TITLE = 'Block timestamp'
       WIKI_DESCRIPTION = 'Dangerous usage of `block.timestamp`. `block.timestamp` can be manipulated by miners.'
       WIKI_EXPLOIT_SCENARIO = '''"Bob's contract relies on `block.timestamp` for its randomness. Eve is a miner and manipulates `block.timestamp` to exploit Bob's contract.'''
       WIKI_RECOMMENDATION = 'Avoid relying on `block.timestamp`.'
   
  -    def timestamp(self, func):
  -        """
  -        """
  -
  -        ret = set()
  -        for node in func.nodes:
  -            if node.contains_require_or_assert():
  -                for var in node.variables_read:
  -                    if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):
  -                        ret.add(node)
  -            for ir in node.irs:
  -                if isinstance(ir, Binary) and BinaryType.return_bool(ir.type):
  -                    for var in ir.read:
  -                        if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):
  -                            ret.add(node)
  -        return list(ret)
  -
  -
  -    def detect_dangerous_timestamp(self, contract):
  -        """
  -        Args:
  -            contract (Contract)
  -        Returns:
  -            list((Function), (list (Node)))
  -        """
  -        ret = []
  -        for f in [f for f in contract.functions if f.contract_declarer == contract]:
  -            nodes = self.timestamp(f)
  -            if nodes:
  -                ret.append((f, nodes))
  -        return ret
  -
       def _detect(self):
           """
           """
           results = []
   
           for c in self.contracts:
  -            dangerous_timestamp = self.detect_dangerous_timestamp(c)
  +            dangerous_timestamp = _detect_dangerous_timestamp(c)
               for (func, nodes) in dangerous_timestamp:
   
                   info = [func, " uses timestamp for comparisons\n"]
  
verification_info: {"golden_diff": "diff --git a/slither/detectors/operations/block_timestamp.py b/slither/detectors/operations/block_timestamp.py\n--- a/slither/detectors/operations/block_timestamp.py\n+++ b/slither/detectors/operations/block_timestamp.py\n@@ -2,15 +2,51 @@\n     Module detecting dangerous use of block.timestamp\n \n \"\"\"\n-from slither.core.declarations import Function\n-from slither.analyses.data_dependency.data_dependency import is_tainted, is_dependent\n-from slither.core.declarations.solidity_variables import (SolidityFunction,\n-                                                          SolidityVariableComposed)\n+from typing import List, Tuple\n+\n+from slither.analyses.data_dependency.data_dependency import is_dependent\n+from slither.core.cfg.node import Node\n+from slither.core.declarations import Function, Contract\n+from slither.core.declarations.solidity_variables import (SolidityVariableComposed, SolidityVariable)\n from slither.detectors.abstract_detector import (AbstractDetector,\n                                                  DetectorClassification)\n from slither.slithir.operations import Binary, BinaryType\n \n \n+def _timestamp(func: Function) -> List[Node]:\n+    ret = set()\n+    for node in func.nodes:\n+        if node.contains_require_or_assert():\n+            for var in node.variables_read:\n+                if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):\n+                    ret.add(node)\n+                if is_dependent(var, SolidityVariable('now'), func.contract):\n+                    ret.add(node)\n+        for ir in node.irs:\n+            if isinstance(ir, Binary) and BinaryType.return_bool(ir.type):\n+                for var in ir.read:\n+                    if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):\n+                        ret.add(node)\n+                    if is_dependent(var, SolidityVariable('now'), func.contract):\n+                        ret.add(node)\n+    return list(ret)\n+\n+\n+def _detect_dangerous_timestamp(contract: Contract) -> List[Tuple[Function, List[Node]]]:\n+    \"\"\"\n+    Args:\n+        contract (Contract)\n+    Returns:\n+        list((Function), (list (Node)))\n+    \"\"\"\n+    ret = []\n+    for f in [f for f in contract.functions if f.contract_declarer == contract]:\n+        nodes = _timestamp(f)\n+        if nodes:\n+            ret.append((f, nodes))\n+    return ret\n+\n+\n class Timestamp(AbstractDetector):\n     \"\"\"\n     \"\"\"\n@@ -22,51 +58,18 @@\n \n     WIKI = 'https://github.com/crytic/slither/wiki/Detector-Documentation#block-timestamp'\n \n-\n     WIKI_TITLE = 'Block timestamp'\n     WIKI_DESCRIPTION = 'Dangerous usage of `block.timestamp`. `block.timestamp` can be manipulated by miners.'\n     WIKI_EXPLOIT_SCENARIO = '''\"Bob's contract relies on `block.timestamp` for its randomness. Eve is a miner and manipulates `block.timestamp` to exploit Bob's contract.'''\n     WIKI_RECOMMENDATION = 'Avoid relying on `block.timestamp`.'\n \n-    def timestamp(self, func):\n-        \"\"\"\n-        \"\"\"\n-\n-        ret = set()\n-        for node in func.nodes:\n-            if node.contains_require_or_assert():\n-                for var in node.variables_read:\n-                    if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):\n-                        ret.add(node)\n-            for ir in node.irs:\n-                if isinstance(ir, Binary) and BinaryType.return_bool(ir.type):\n-                    for var in ir.read:\n-                        if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):\n-                            ret.add(node)\n-        return list(ret)\n-\n-\n-    def detect_dangerous_timestamp(self, contract):\n-        \"\"\"\n-        Args:\n-            contract (Contract)\n-        Returns:\n-            list((Function), (list (Node)))\n-        \"\"\"\n-        ret = []\n-        for f in [f for f in contract.functions if f.contract_declarer == contract]:\n-            nodes = self.timestamp(f)\n-            if nodes:\n-                ret.append((f, nodes))\n-        return ret\n-\n     def _detect(self):\n         \"\"\"\n         \"\"\"\n         results = []\n \n         for c in self.contracts:\n-            dangerous_timestamp = self.detect_dangerous_timestamp(c)\n+            dangerous_timestamp = _detect_dangerous_timestamp(c)\n             for (func, nodes) in dangerous_timestamp:\n \n                 info = [func, \" uses timestamp for comparisons\\n\"]\n", "issue": "Add \"now\" to the timestamp detector\nhttps://github.com/crytic/slither/blob/7cb6cf4870036f780088fa7dfec83ae3220322e2/slither/detectors/operations/block_timestamp.py#L39-L44\r\n\r\nThis could also warns about the use of `now`\n", "before_files": [{"content": "\"\"\"\n    Module detecting dangerous use of block.timestamp\n\n\"\"\"\nfrom slither.core.declarations import Function\nfrom slither.analyses.data_dependency.data_dependency import is_tainted, is_dependent\nfrom slither.core.declarations.solidity_variables import (SolidityFunction,\n                                                          SolidityVariableComposed)\nfrom slither.detectors.abstract_detector import (AbstractDetector,\n                                                 DetectorClassification)\nfrom slither.slithir.operations import Binary, BinaryType\n\n\nclass Timestamp(AbstractDetector):\n    \"\"\"\n    \"\"\"\n\n    ARGUMENT = 'timestamp'\n    HELP = 'Dangerous usage of `block.timestamp`'\n    IMPACT = DetectorClassification.LOW\n    CONFIDENCE = DetectorClassification.MEDIUM\n\n    WIKI = 'https://github.com/crytic/slither/wiki/Detector-Documentation#block-timestamp'\n\n\n    WIKI_TITLE = 'Block timestamp'\n    WIKI_DESCRIPTION = 'Dangerous usage of `block.timestamp`. `block.timestamp` can be manipulated by miners.'\n    WIKI_EXPLOIT_SCENARIO = '''\"Bob's contract relies on `block.timestamp` for its randomness. Eve is a miner and manipulates `block.timestamp` to exploit Bob's contract.'''\n    WIKI_RECOMMENDATION = 'Avoid relying on `block.timestamp`.'\n\n    def timestamp(self, func):\n        \"\"\"\n        \"\"\"\n\n        ret = set()\n        for node in func.nodes:\n            if node.contains_require_or_assert():\n                for var in node.variables_read:\n                    if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):\n                        ret.add(node)\n            for ir in node.irs:\n                if isinstance(ir, Binary) and BinaryType.return_bool(ir.type):\n                    for var in ir.read:\n                        if is_dependent(var, SolidityVariableComposed('block.timestamp'), func.contract):\n                            ret.add(node)\n        return list(ret)\n\n\n    def detect_dangerous_timestamp(self, contract):\n        \"\"\"\n        Args:\n            contract (Contract)\n        Returns:\n            list((Function), (list (Node)))\n        \"\"\"\n        ret = []\n        for f in [f for f in contract.functions if f.contract_declarer == contract]:\n            nodes = self.timestamp(f)\n            if nodes:\n                ret.append((f, nodes))\n        return ret\n\n    def _detect(self):\n        \"\"\"\n        \"\"\"\n        results = []\n\n        for c in self.contracts:\n            dangerous_timestamp = self.detect_dangerous_timestamp(c)\n            for (func, nodes) in dangerous_timestamp:\n\n                info = [func, \" uses timestamp for comparisons\\n\"]\n\n                info += ['\\tDangerous comparisons:\\n']\n                for node in nodes:\n                    info += ['\\t- ', node, '\\n']\n\n                res = self.generate_result(info)\n\n                results.append(res)\n\n        return results\n", "path": "slither/detectors/operations/block_timestamp.py"}]}