| 1 | #!/usr/bin/python
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| 2 | """
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| 3 | ast_lib.py
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| 4 |
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| 5 | Helpers for osh/osh.asdl
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| 6 | """
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| 7 |
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| 8 | import sys
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| 9 |
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| 10 | from asdl import format as fmt
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| 11 | from osh.meta import Id
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| 12 |
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| 13 |
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| 14 | _ColoredString = fmt._ColoredString
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| 15 | MakeTree = fmt.MakeTree
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| 16 | _STRING_LITERAL = fmt._STRING_LITERAL
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| 17 | _OTHER_TYPE = fmt._OTHER_TYPE
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| 18 |
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| 19 |
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| 20 | def _AbbreviateToken(token, out):
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| 21 | if token.id != Id.Lit_Chars:
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| 22 | c = _ColoredString(str(token.id), _OTHER_TYPE)
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| 23 | out.append(c)
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| 24 |
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| 25 | out.append(_ColoredString(token.val, _STRING_LITERAL))
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| 26 |
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| 27 |
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| 28 | def _GetFieldNames(node):
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| 29 | # Don't let the 'spids' field disable abbreviation
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| 30 | return [n for n, _ in node.fields if n != 'spids']
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| 31 |
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| 32 |
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| 33 | def AbbreviateNodes(obj, node):
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| 34 | """
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| 35 | Args:
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| 36 | obj: py_meta.Obj to print
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| 37 | node: homogeneous node after MakeTree prints it; can be mutated
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| 38 | """
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| 39 | if node.node_type == 'token':
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| 40 | node.abbrev = True
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| 41 | node.node_type = 'T'
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| 42 | node.show_node_type = False
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| 43 | node.left = '<'
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| 44 | node.right = '>'
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| 45 | _AbbreviateToken(obj, node.unnamed_fields)
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| 46 |
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| 47 | elif node.node_type == 'LiteralPart':
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| 48 | node.abbrev = True
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| 49 | node.node_type = 'L'
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| 50 | node.show_node_type = False
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| 51 |
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| 52 | _AbbreviateToken(obj.token, node.unnamed_fields)
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| 53 |
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| 54 | elif node.node_type == 'SimpleVarSub':
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| 55 | node.abbrev = True
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| 56 | node.node_type = '$'
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| 57 | _AbbreviateToken(obj.token, node.unnamed_fields)
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| 58 |
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| 59 | elif node.node_type == 'BracedVarSub':
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| 60 | if _GetFieldNames(node) != ['token']:
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| 61 | return # we have other fields to display; don't abbreviate
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| 62 |
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| 63 | node.abbrev = True
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| 64 | node.node_type = '${'
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| 65 | _AbbreviateToken(obj.token, node.unnamed_fields)
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| 66 |
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| 67 | elif node.node_type == 'DoubleQuotedPart':
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| 68 | node.abbrev = True
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| 69 | node.node_type = 'DQ'
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| 70 |
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| 71 | for part in obj.parts:
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| 72 | node.unnamed_fields.append(MakeTree(part, AbbreviateNodes))
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| 73 |
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| 74 | # Only abbreviate 'foo', not $'foo\n'
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| 75 | elif (node.node_type == 'SingleQuotedPart' and
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| 76 | obj.left.id == Id.Left_SingleQuote):
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| 77 | node.abbrev = True
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| 78 | node.node_type = 'SQ'
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| 79 |
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| 80 | for token in obj.tokens:
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| 81 | node.unnamed_fields.append(MakeTree(token, AbbreviateNodes))
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| 82 |
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| 83 | elif node.node_type == 'CompoundWord':
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| 84 | node.abbrev = True
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| 85 | node.node_type = 'W'
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| 86 | node.show_node_type = False
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| 87 | node.left = '{'
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| 88 | node.right = '}'
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| 89 |
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| 90 | for part in obj.parts:
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| 91 | node.unnamed_fields.append(MakeTree(part, AbbreviateNodes))
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| 92 |
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| 93 | elif node.node_type == 'SimpleCommand':
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| 94 | if _GetFieldNames(node) != ['words']:
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| 95 | return # we have other fields to display; don't abbreviate
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| 96 |
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| 97 | node.abbrev = True
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| 98 | node.node_type = 'C'
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| 99 |
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| 100 | for w in obj.words:
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| 101 | # Recursively call MakeTree here?
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| 102 | # Well actually then the printer needs to recursively handle it
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| 103 | node.unnamed_fields.append(MakeTree(w, AbbreviateNodes))
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| 104 |
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| 105 |
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| 106 | def PrettyPrint(node, f=sys.stdout):
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| 107 | ast_f = fmt.DetectConsoleOutput(f)
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| 108 | tree = fmt.MakeTree(node, AbbreviateNodes)
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| 109 | fmt.PrintTree(tree, ast_f)
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| 110 | f.write('\n')
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