OILS / builtin / io_ysh.py View on Github | oils.pub

291 lines, 181 significant
1#!/usr/bin/env python2
2"""
3builtin/io_ysh.py - YSH builtins that perform I/O
4"""
5from __future__ import print_function
6
7from _devbuild.gen import arg_types
8from _devbuild.gen.runtime_asdl import cmd_value
9from _devbuild.gen.value_asdl import value, value_e
10from asdl import format as fmt
11from builtin import method_other
12from core import error
13from core.error import e_usage
14from core import state
15from display import ui
16from core import vm
17from data_lang import j8
18from frontend import flag_util
19from frontend import match
20from frontend import typed_args
21from mycpp import mylib
22from mycpp.mylib import log, iteritems
23
24from typing import TYPE_CHECKING, cast
25if TYPE_CHECKING:
26 from core.alloc import Arena
27 from osh import cmd_eval
28 from ysh import expr_eval
29
30_ = log
31
32
33class _Builtin(vm._Builtin):
34
35 def __init__(self, mem, errfmt):
36 # type: (state.Mem, ui.ErrorFormatter) -> None
37 self.mem = mem
38 self.errfmt = errfmt
39
40
41class Pp(_Builtin):
42 """Given a list of variable names, print their values.
43
44 'pp cell a' is a lot easier to type than 'argv.py "${a[@]}"'.
45 """
46
47 def __init__(
48 self,
49 expr_ev, # type: expr_eval.ExprEvaluator
50 mem, # type: state.Mem
51 errfmt, # type: ui.ErrorFormatter
52 procs, # type: state.Procs
53 arena, # type: Arena
54 ):
55 # type: (...) -> None
56 _Builtin.__init__(self, mem, errfmt)
57 self.expr_ev = expr_ev
58 self.procs = procs
59 self.arena = arena
60 self.stdout_ = mylib.Stdout()
61
62 def _PrettyPrint(self, cmd_val):
63 # type: (cmd_value.Argv) -> int
64 rd = typed_args.ReaderForProc(cmd_val)
65 val = rd.PosValue()
66 rd.Done()
67
68 blame_tok = rd.LeftParenToken()
69
70 # Show it with location
71 # It looks like
72 # pp (42)
73 # ^
74 # [ stdin ]:5: (Int) 42
75 # We could also print with ! or -^-
76
77 self.stdout_.write('\n')
78 excerpt, prefix = ui.CodeExcerptAndPrefix(blame_tok)
79 self.stdout_.write(excerpt)
80 ui.PrettyPrintValue(prefix, val, self.stdout_)
81
82 return 0
83
84 def Run(self, cmd_val):
85 # type: (cmd_value.Argv) -> int
86 arg, arg_r = flag_util.ParseCmdVal('pp',
87 cmd_val,
88 accept_typed_args=True)
89
90 action, action_loc = arg_r.Peek2()
91
92 # Special cases
93 # pp (x) quotes its code location, can also be pp [x]
94 if action is None:
95 return self._PrettyPrint(cmd_val)
96
97 arg_r.Next()
98
99 if action == 'value':
100 # pp value (x) prints in the same way that '= x' does
101 rd = typed_args.ReaderForProc(cmd_val)
102 val = rd.PosValue()
103 rd.Done()
104
105 ui.PrettyPrintValue('', val, self.stdout_)
106 return 0
107
108 if action == 'asdl_':
109 # TODO: could be pp asdl_ (x, y, z)
110 rd = typed_args.ReaderForProc(cmd_val)
111 val = rd.PosValue()
112 rd.Done()
113
114 tree = val.PrettyTree(False)
115
116 # TODO: ASDL should print the IDs. And then they will be
117 # line-wrapped.
118 # The IDs should also be used to detect cycles, and omit values
119 # already printed.
120 #id_str = vm.ValueIdString(val)
121 #f.write(' <%s%s>\n' % (ysh_type, id_str))
122
123 max_width = ui._GetMaxWidth()
124 fmt.HNodePrettyPrint(tree, self.stdout_, max_width=max_width)
125 #self.stdout_.write('\n')
126
127 return 0
128
129 if action == 'test_': # Print format for spec tests
130 # TODO: could be pp test_ (x, y, z)
131 rd = typed_args.ReaderForProc(cmd_val)
132 val = rd.PosValue()
133 rd.Done()
134
135 if ui.TypeNotPrinted(val):
136 ysh_type = ui.ValType(val)
137 self.stdout_.write('(%s) ' % ysh_type)
138
139 j8.PrintLine(val, self.stdout_)
140
141 return 0
142
143 if action == 'cell_': # Format may change
144 argv, locs = arg_r.Rest2()
145
146 status = 0
147 for i, name in enumerate(argv):
148
149 if not match.IsValidVarName(name):
150 raise error.Usage('got invalid variable name %r' % name,
151 locs[i])
152
153 cell = self.mem.GetCell(name)
154 if cell is None:
155 self.errfmt.Print_("Couldn't find a variable named %r" %
156 name,
157 blame_loc=locs[i])
158 status = 1
159 else:
160 self.stdout_.write('%s = ' % name)
161 fmt.HNodePrettyPrint(cell.PrettyTree(False), self.stdout_)
162 return status
163
164 if action == 'stacks_': # Format may change
165 if mylib.PYTHON:
166 var_stack, argv_stack, unused = self.mem.Dump()
167 print(var_stack)
168 print('===')
169 print(argv_stack)
170 if 0:
171 var_stack = self.mem.var_stack
172 for i, frame in enumerate(var_stack):
173 print('=== Frame %d' % i)
174 for name, cell in iteritems(frame):
175 print('%s = %s' % (name, cell))
176
177 return 0
178
179 if action == 'frame_vars_': # Print names in current frame, for testing
180 top = self.mem.var_stack[-1]
181 print(' [frame_vars_] %s' % ' '.join(top.keys()))
182 return 0
183
184 if action == 'gc-stats_':
185 print('TODO')
186 return 0
187
188 if action == 'proc':
189 names, locs = arg_r.Rest2()
190 if len(names):
191 for i, name in enumerate(names):
192 node, _ = self.procs.GetInvokable(name)
193 if node is None:
194 self.errfmt.Print_('Invalid proc %r' % name,
195 blame_loc=locs[i])
196 return 1
197 else:
198 names = self.procs.InvokableNames()
199
200 # TSV8 header
201 # TODO: should be #.qtt8
202 print('proc_name\tdoc_comment')
203 for name in names:
204 proc_val, _ = self.procs.GetInvokable(name) # must exist
205 if proc_val.tag() != value_e.Proc:
206 continue # can't be value.BuiltinProc
207 user_proc = cast(value.Proc, proc_val)
208
209 doc = method_other.GetDocComment(user_proc.body)
210 if doc is None:
211 doc = ''
212
213 # Note: these should be attributes on value.Proc
214 buf = mylib.BufWriter()
215 j8.EncodeString(name, buf, unquoted_ok=True)
216 buf.write('\t')
217 j8.EncodeString(doc, buf, unquoted_ok=True)
218 print(buf.getvalue())
219
220 return 0
221
222 e_usage('got invalid action %r' % action, action_loc)
223 #return status
224
225
226class Write(_Builtin):
227 """
228 write -- @strs
229 write --sep ' ' --end '' -- @strs
230 write -n -- @
231 write --j8 -- @strs # argv serialization
232 write --j8 --sep $'\t' -- @strs # this is like TSV8
233 """
234
235 def __init__(self, mem, errfmt):
236 # type: (state.Mem, ui.ErrorFormatter) -> None
237 _Builtin.__init__(self, mem, errfmt)
238 self.stdout_ = mylib.Stdout()
239
240 def Run(self, cmd_val):
241 # type: (cmd_value.Argv) -> int
242 attrs, arg_r = flag_util.ParseCmdVal('write', cmd_val)
243 arg = arg_types.write(attrs.attrs)
244 #print(arg)
245
246 i = 0
247 while not arg_r.AtEnd():
248 if i != 0:
249 self.stdout_.write(arg.sep)
250 s = arg_r.Peek()
251
252 if arg.json:
253 s = j8.MaybeEncodeJsonString(s)
254
255 elif arg.j8:
256 s = j8.MaybeEncodeString(s)
257
258 self.stdout_.write(s)
259
260 arg_r.Next()
261 i += 1
262
263 if arg.n:
264 pass
265 elif len(arg.end):
266 self.stdout_.write(arg.end)
267
268 return 0
269
270
271class RunBlock(vm._Builtin):
272 """Used for 'redir' builtin
273
274 It's used solely for its redirects.
275 redir >out.txt { echo hi }
276 """
277
278 def __init__(self, mem, cmd_ev):
279 # type: (state.Mem, cmd_eval.CommandEvaluator) -> None
280 self.mem = mem
281 self.cmd_ev = cmd_ev # To run blocks
282
283 def Run(self, cmd_val):
284 # type: (cmd_value.Argv) -> int
285 _, arg_r = flag_util.ParseCmdVal('redir',
286 cmd_val,
287 accept_typed_args=True)
288
289 cmd_frag = typed_args.RequiredBlockAsFrag(cmd_val)
290 unused = self.cmd_ev.EvalCommandFrag(cmd_frag)
291 return 0