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Add variableValues to CoerceListValue() #2

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Add variableValues to CoerceListValue() #2

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25 changes: 16 additions & 9 deletions spec/Section 3 -- Type System.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1772,29 +1772,33 @@ single value, a client can just pass that value directly rather than
constructing the list.

The result of coercion of a value {value} to a list type {listType} is
{CoerceListValue(value, listType)}.
{CoerceListValue(value, listType, variableValues)}.

CoerceListValue(value, listType):
CoerceListValue(value, listType, variableValues):

- If {value} is {null}, return {null}.
- Let {itemType} be the inner type of {listType}.
- Let {coercedList} be an empty list.
- If {value} is a list:
- For each {itemValue} in {value}:
- Let {coercedItemValue} be {CoerceListItemValue(itemValue, itemType)}.
- Let {coercedItemValue} be {CoerceListItemValue(itemValue, itemType,
variableValues)}.
- Append {coercedItemValue} to {coercedList}.
- Otherwise:
- Let {coercedItemValue} be {CoerceListItemValue(value, itemType)}.
- Let {coercedItemValue} be {CoerceListItemValue(value, itemType,
variableValues)}.
- Append {coercedItemValue} to {coercedList}.
- Return {coercedList}.

CoerceListItemValue(itemValue, itemType):
CoerceListItemValue(itemValue, itemType, variablesValues):

- If {itemValue} is a Variable:
- If the variable provides a runtime value:
- Let {coercedItemValue} be the runtime value of the variable.
- Otherwise, if the variable definition provides a default value:
- Let {coercedItemValue} be this default value.
- Let {variableName} be the name of {itemValue}.
- Let {hasValue} be true if {variableValues} provides a value for the name
{variableName}.
- If {hasValue} is true
- Let {coercedItemValue} be the value provided in {variableValues} for the
name {variableName}.
- Otherwise:
- Let {coercedItemValue} be {null}.
- If {coercedItemValue} is {null} and {itemType} is a non-null type, a _field
Expand All @@ -1803,6 +1807,9 @@ CoerceListItemValue(itemValue, itemType):
- Otherwise, return the result of coercing {itemValue} according to the input
coercion rules for {itemType}.

Note: {variableValues} is an empty Map when coercing variable values or the
result of {CoerceVariableValues} when coercing argument values.

Note: When a default value exists for a variable definition, the type of the
variable is allowed to be nullable even if it is used in a non-nullable
position, see
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