Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/jinja2/nativetypes.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 from ast import literal_eval |
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2 from itertools import chain |
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3 from itertools import islice |
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4 |
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5 from . import nodes |
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6 from ._compat import text_type |
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7 from .compiler import CodeGenerator |
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8 from .compiler import has_safe_repr |
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9 from .environment import Environment |
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10 from .environment import Template |
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11 |
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12 |
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13 def native_concat(nodes): |
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14 """Return a native Python type from the list of compiled nodes. If |
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15 the result is a single node, its value is returned. Otherwise, the |
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16 nodes are concatenated as strings. If the result can be parsed with |
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17 :func:`ast.literal_eval`, the parsed value is returned. Otherwise, |
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18 the string is returned. |
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19 |
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20 :param nodes: Iterable of nodes to concatenate. |
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21 """ |
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22 head = list(islice(nodes, 2)) |
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23 |
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24 if not head: |
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25 return None |
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26 |
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27 if len(head) == 1: |
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28 raw = head[0] |
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29 else: |
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30 raw = u"".join([text_type(v) for v in chain(head, nodes)]) |
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31 |
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32 try: |
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33 return literal_eval(raw) |
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34 except (ValueError, SyntaxError, MemoryError): |
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35 return raw |
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36 |
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37 |
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38 class NativeCodeGenerator(CodeGenerator): |
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39 """A code generator which renders Python types by not adding |
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40 ``to_string()`` around output nodes. |
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41 """ |
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42 |
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43 @staticmethod |
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44 def _default_finalize(value): |
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45 return value |
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46 |
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47 def _output_const_repr(self, group): |
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48 return repr(u"".join([text_type(v) for v in group])) |
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49 |
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50 def _output_child_to_const(self, node, frame, finalize): |
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51 const = node.as_const(frame.eval_ctx) |
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52 |
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53 if not has_safe_repr(const): |
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54 raise nodes.Impossible() |
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55 |
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56 if isinstance(node, nodes.TemplateData): |
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57 return const |
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58 |
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59 return finalize.const(const) |
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60 |
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61 def _output_child_pre(self, node, frame, finalize): |
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62 if finalize.src is not None: |
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63 self.write(finalize.src) |
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64 |
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65 def _output_child_post(self, node, frame, finalize): |
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66 if finalize.src is not None: |
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67 self.write(")") |
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68 |
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69 |
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70 class NativeEnvironment(Environment): |
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71 """An environment that renders templates to native Python types.""" |
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72 |
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73 code_generator_class = NativeCodeGenerator |
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74 |
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75 |
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76 class NativeTemplate(Template): |
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77 environment_class = NativeEnvironment |
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78 |
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79 def render(self, *args, **kwargs): |
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80 """Render the template to produce a native Python type. If the |
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81 result is a single node, its value is returned. Otherwise, the |
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82 nodes are concatenated as strings. If the result can be parsed |
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83 with :func:`ast.literal_eval`, the parsed value is returned. |
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84 Otherwise, the string is returned. |
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85 """ |
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86 vars = dict(*args, **kwargs) |
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87 |
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88 try: |
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89 return native_concat(self.root_render_func(self.new_context(vars))) |
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90 except Exception: |
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91 return self.environment.handle_exception() |
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92 |
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93 |
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94 NativeEnvironment.template_class = NativeTemplate |