minpkg/core/scope.nim
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import
std/[strutils, critbits]
import
parser
proc copy*(s: ref MinScope): ref MinScope =
var scope = newScope(s.parent)
scope.symbols = s.symbols
scope.sigils = s.sigils
new(result)
result[] = scope
proc getDictionary(d: MinOperator): MinValue=
if d.kind == minValOp and d.val.kind == minQuotation and d.val.qVal.len ==
1 and d.val.qVal[0].kind == minDictionary:
return d.val.qVal[0]
elif d.kind == minValOp and d.val.kind == minDictionary:
return d.val
proc getSymbolFromPath(scope: ref MinScope, keys: var seq[
string], acc = 0): MinOperator
proc getSymbol*(scope: ref MinScope, key: string, acc = 0): MinOperator =
if scope.symbols.hasKey(key):
return scope.symbols[key]
elif key.contains ".":
var keys = key.split(".")
return getSymbolFromPath(scope, keys, acc)
else:
if scope.parent.isNil:
raiseUndefined("Unable to retrieve symbol '$1' (not found)." % key)
return scope.parent.getSymbol(key, acc + 1)
proc getSymbolFromPath(scope: ref MinScope, keys: var seq[
string], acc = 0): MinOperator =
let sym = keys[0]
keys.delete(0)
let d = scope.getSymbol(sym, acc)
let dict = d.getDictionary
if not dict.isNil:
if keys.len > 1:
return dict.scope.getSymbolFromPath(keys, acc + 1)
else:
return dict.scope.getSymbol(keys[0], acc + 1)
else:
raiseInvalid("Symbol '$1' is not a dictionary." % sym)
proc hasSymbolFromPath(scope: ref MinScope, keys: var seq[
string]): bool
proc hasSymbol*(scope: ref MinScope, key: string): bool =
if scope.isNil:
return false
elif scope.symbols.hasKey(key):
return true
elif key.contains("."):
var keys = key.split(".")
if keys[0] == "":
raiseInvalid("Symbols cannot start with a dot")
return hasSymbolFromPath(scope, keys)
elif not scope.parent.isNil:
return scope.parent.hasSymbol(key)
else:
return false
proc hasSymbolFromPath(scope: ref MinScope, keys: var seq[
string]): bool =
let sym = keys[0]
keys.delete(0)
let d = scope.getSymbol(sym)
let dict = d.getDictionary
if not dict.isNil:
if keys.len > 1:
return dict.scope.hasSymbolFromPath(keys)
else:
return dict.scope.hasSymbol(keys[0])
else:
raiseInvalid("Symbol '$1' is not a dictionary." % sym)
proc delSymbolFromPath(scope: ref MinScope, keys: var seq[
string]): bool
proc delSymbol*(scope: ref MinScope, key: string): bool {.discardable.} =
if scope.symbols.hasKey(key):
if scope.symbols[key].sealed:
raiseInvalid("Symbol '$1' is sealed." % key)
scope.symbols.excl(key)
return true
elif key.contains ".":
var keys = key.split(".")
return delSymbolFromPath(scope, keys)
return false
proc delSymbolFromPath(scope: ref MinScope, keys: var seq[
string]): bool =
let sym = keys[0]
keys.delete(0)
let d = scope.getSymbol(sym)
let dict = d.getDictionary
if not dict.isNil:
if keys.len > 1:
return dict.scope.delSymbolFromPath(keys)
else:
return dict.scope.delSymbol(keys[0])
else:
raiseInvalid("Symbol '$1' is not a dictionary." % sym)
proc setSymbolFromPath(scope: ref MinScope, keys: var seq[
string], value: MinOperator, override = false): bool {.discardable.}
proc setSymbol*(scope: ref MinScope, key: string, value: MinOperator,
override = false, define = false): bool {.discardable.} =
result = false
# check if a symbol already exists in current scope
if not scope.isNil and scope.symbols.hasKey(key):
if not override and scope.symbols[key].sealed:
raiseInvalid("Symbol '$1' is sealed ." % key)
scope.symbols[key] = value
result = true
elif key.contains ".":
var keys = key.split(".")
return setSymbolFromPath(scope, keys, value, override)
# define new symbol
elif not scope.isNil and define:
scope.symbols[key] = value
result = true
else:
# Go up the scope chain and attempt to find the symbol
if not scope.parent.isNil:
result = scope.parent.setSymbol(key, value, override)
proc setSymbolFromPath(scope: ref MinScope, keys: var seq[
string], value: MinOperator, override = false): bool {.discardable.} =
let sym = keys[0]
keys.delete(0)
let d = scope.getSymbol(sym)
let dict = d.getDictionary
if not dict.isNil:
if keys.len > 1:
return dict.scope.setSymbolFromPath(keys, value, override)
else:
return dict.scope.setSymbol(keys[0], value, override)
else:
raiseInvalid("Symbol '$1' is not a dictionary." % sym)
proc getSigil*(scope: ref MinScope, key: string): MinOperator =
if scope.sigils.hasKey(key):
return scope.sigils[key]
elif not scope.parent.isNil:
return scope.parent.getSigil(key)
else:
raiseUndefined("Sigil '$1' not found." % key)
proc hasSigil*(scope: ref MinScope, key: string): bool =
if scope.isNil:
return false
elif scope.sigils.hasKey(key):
return true
elif not scope.parent.isNil:
return scope.parent.hasSigil(key)
else:
return false
proc delSigil*(scope: ref MinScope, key: string): bool {.discardable.} =
if scope.sigils.hasKey(key):
if scope.sigils[key].sealed:
raiseInvalid("Sigil '$1' is sealed." % key)
scope.sigils.excl(key)
return true
return false
proc setSigil*(scope: ref MinScope, key: string, value: MinOperator,
override = false): bool {.discardable.} =
result = false
# check if a sigil already exists in current scope
if not scope.isNil and scope.sigils.hasKey(key):
if not override and scope.sigils[key].sealed:
raiseInvalid("Sigil '$1' is sealed." % key)
scope.sigils[key] = value
result = true
else:
# Go up the scope chain and attempt to find the sigil
if not scope.parent.isNil:
result = scope.parent.setSymbol(key, value)
proc previous*(scope: ref MinScope): ref MinScope =
if scope.parent.isNil:
return scope
else:
return scope.parent
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