| 1 | #!/usr/bin/env python2
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| 2 | """
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| 3 | func_reflect.py - Functions for reflecting on Oils code - OSH or YSH.
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| 4 | """
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| 5 | from __future__ import print_function
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| 6 |
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| 7 | from _devbuild.gen.runtime_asdl import (scope_e)
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| 8 | from _devbuild.gen.syntax_asdl import source
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| 9 | from _devbuild.gen.value_asdl import (value, value_t)
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| 10 |
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| 11 | from core import alloc
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| 12 | from core import error
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| 13 | from core import main_loop
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| 14 | from core import state
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| 15 | from core import vm
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| 16 | from frontend import location
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| 17 | from frontend import reader
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| 18 | from frontend import typed_args
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| 19 | from mycpp.mylib import log
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| 20 | from ysh import expr_eval
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| 21 |
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| 22 | from typing import TYPE_CHECKING
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| 23 | if TYPE_CHECKING:
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| 24 | from frontend import parse_lib
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| 25 | from display import ui
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| 26 |
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| 27 | _ = log
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| 28 |
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| 29 |
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| 30 | class Shvar_get(vm._Callable):
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| 31 | """Look up with dynamic scope."""
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| 32 |
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| 33 | def __init__(self, mem):
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| 34 | # type: (state.Mem) -> None
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| 35 | vm._Callable.__init__(self)
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| 36 | self.mem = mem
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| 37 |
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| 38 | def Call(self, rd):
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| 39 | # type: (typed_args.Reader) -> value_t
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| 40 | name = rd.PosStr()
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| 41 | rd.Done()
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| 42 | return state.DynamicGetVar(self.mem, name, scope_e.Dynamic)
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| 43 |
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| 44 |
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| 45 | class GetVar(vm._Callable):
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| 46 | """Look up a variable, with normal scoping rules."""
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| 47 |
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| 48 | def __init__(self, mem):
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| 49 | # type: (state.Mem) -> None
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| 50 | vm._Callable.__init__(self)
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| 51 | self.mem = mem
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| 52 |
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| 53 | def Call(self, rd):
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| 54 | # type: (typed_args.Reader) -> value_t
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| 55 | name = rd.PosStr()
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| 56 | rd.Done()
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| 57 | return state.DynamicGetVar(self.mem, name, scope_e.LocalOrGlobal)
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| 58 |
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| 59 |
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| 60 | class SetVar(vm._Callable):
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| 61 | """Set a variable in the local scope.
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| 62 |
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| 63 | We could have a separae setGlobal() too.
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| 64 | """
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| 65 |
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| 66 | def __init__(self, mem):
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| 67 | # type: (state.Mem) -> None
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| 68 | vm._Callable.__init__(self)
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| 69 | self.mem = mem
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| 70 |
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| 71 | def Call(self, rd):
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| 72 | # type: (typed_args.Reader) -> value_t
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| 73 | var_name = rd.PosStr()
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| 74 | val = rd.PosValue()
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| 75 | rd.Done()
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| 76 | self.mem.SetNamed(location.LName(var_name), val, scope_e.LocalOnly)
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| 77 | return value.Null
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| 78 |
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| 79 |
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| 80 | class ParseCommand(vm._Callable):
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| 81 |
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| 82 | def __init__(self, parse_ctx, errfmt):
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| 83 | # type: (parse_lib.ParseContext, ui.ErrorFormatter) -> None
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| 84 | self.parse_ctx = parse_ctx
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| 85 | self.errfmt = errfmt
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| 86 |
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| 87 | def Call(self, rd):
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| 88 | # type: (typed_args.Reader) -> value_t
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| 89 | code_str = rd.PosStr()
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| 90 | rd.Done()
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| 91 |
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| 92 | line_reader = reader.StringLineReader(code_str, self.parse_ctx.arena)
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| 93 | c_parser = self.parse_ctx.MakeOshParser(line_reader)
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| 94 |
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| 95 | # TODO: it would be nice to point to the location of the expression
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| 96 | # argument
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| 97 | src = source.Dynamic('parseCommand()', rd.LeftParenToken())
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| 98 | with alloc.ctx_SourceCode(self.parse_ctx.arena, src):
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| 99 | try:
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| 100 | cmd = main_loop.ParseWholeFile(c_parser)
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| 101 | except error.Parse as e:
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| 102 | # This prints the location
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| 103 | self.errfmt.PrettyPrintError(e)
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| 104 |
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| 105 | # TODO: add inner location info to this structured error
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| 106 | raise error.Structured(3, "Syntax error in parseCommand()",
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| 107 | rd.LeftParenToken())
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| 108 |
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| 109 | return value.Command(cmd)
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| 110 |
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| 111 |
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| 112 | class ParseExpr(vm._Callable):
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| 113 |
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| 114 | def __init__(self, parse_ctx, errfmt):
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| 115 | # type: (parse_lib.ParseContext, ui.ErrorFormatter) -> None
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| 116 | self.parse_ctx = parse_ctx
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| 117 | self.errfmt = errfmt
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| 118 |
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| 119 | def Call(self, rd):
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| 120 | # type: (typed_args.Reader) -> value_t
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| 121 | code_str = rd.PosStr()
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| 122 | rd.Done()
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| 123 |
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| 124 | return value.Null
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| 125 |
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| 126 |
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| 127 | class EvalExpr(vm._Callable):
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| 128 |
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| 129 | def __init__(self, expr_ev):
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| 130 | # type: (expr_eval.ExprEvaluator) -> None
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| 131 | self.expr_ev = expr_ev
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| 132 |
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| 133 | def Call(self, rd):
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| 134 | # type: (typed_args.Reader) -> value_t
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| 135 | lazy = rd.PosExpr()
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| 136 | rd.Done()
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| 137 |
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| 138 | result = self.expr_ev.EvalExpr(lazy, rd.LeftParenToken())
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| 139 |
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| 140 | return result
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