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Update active pseudo-grammar of the bicep language #19169

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Merged
anthony-c-martin merged 1 commit into from
Mar 11, 2026
Merged

Update active pseudo-grammar of the bicep language #19169

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18 changes: 13 additions & 5 deletions docs/grammar.md
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Original file line number Diff line number Diff line change
Expand Up @@ -49,15 +49,15 @@ parameterDefaultValue -> "=" expression

typeDecl -> decorator* "type" IDENTIFIER(name) "=" typeExpression NL

varDecl -> decorator* "var" IDENTIFIER(name) "=" expression NL
varDecl -> decorator* "var" IDENTIFIER(name) typeExpression? "=" expression NL

resourceDecl -> decorator* "resource" IDENTIFIER(name) interpString(type) "existing"? "=" (ifCondition | object | forExpression) NL

moduleDecl -> decorator* "module" IDENTIFIER(name) interpString(type) "=" (ifCondition | object | forExpression) NL

testDecl -> "test" IDENTIFIER(name) interpString(type) "=" (object) NL

assertDecl -> decorator* "assert" IDENTIFIER(name) "=" expression NL
assertDecl -> "assert" IDENTIFIER(name) "=" expression NL

outputDecl ->
decorator* "output" IDENTIFIER(name) IDENTIFIER(type) "=" expression NL
Expand Down Expand Up @@ -127,7 +127,7 @@ primaryExpression ->
functionCall |
literalValue |
interpString |
multilineString |
interpMultilineString |
array |
forExpression |
object |
Expand Down Expand Up @@ -155,13 +155,18 @@ forExpression -> "[" "for" (IDENTIFIER(item) | forVariableBlock) "in" expression
forVariableBlock -> "(" IDENTIFIER(item) "," IDENTIFIER(index) ")"
forBody -> expression(body) | ifCondition

interpString -> stringLeftPiece ( expression stringMiddlePiece )* expression stringRightPiece | stringComplete
interpString -> ( stringLeftPiece ( expression stringMiddlePiece )* expression stringRightPiece ) | stringComplete
stringLeftPiece -> "'" STRINGCHAR* "${"
stringMiddlePiece -> "}" STRINGCHAR* "${"
stringRightPiece -> "}" STRINGCHAR* "'"
stringComplete -> "'" STRINGCHAR* "'"

multilineString -> "'''" + MULTILINESTRINGCHAR+ + "'''"
interpMultilineString -> ( interpMultilineStringLeftPiece ( expression interpMultilineStringMiddlePiece )* expression interpMultilineStringRightPiece ) | multilineString
interpMultilineStringLeftPiece -> "$"+ "'''" MULTILINESTRINGCHAR* "$"+ "{"
interpMultilineStringMiddlePiece -> "}" MULTILINESTRINGCHAR* "$"+ "{"
interpMultilineStringRightPiece -> "}" MULTILINESTRINGCHAR* "'''"

multilineString -> "'''" MULTILINESTRINGCHAR* "'''"

literalValue -> NUMBER | "true" | "false" | "null"

Expand Down Expand Up @@ -198,6 +203,7 @@ primaryTypeExpression ->
typeReference ->
ambientTypeReference |
fullyQualifiedAmbientTypeReference |
resourceDerivedType |
IDENTIFIER(type) |
IDENTIFIER(importedType) |
IDENTIFIER(wildcardImport) "." IDENTIFIER(type) |
Expand All @@ -209,6 +215,8 @@ ambientTypeReference -> "string" | "int" | "bool" | "array" | "object"

fullyQualifiedAmbientTypeReference -> IDENTIFIER(sysNamespace) "." ambientTypeReference

resourceDerivedType -> ( "resourceInput" | "resourceOutput" ) "<" interpString(type) ">"

objectType -> "{" (NL+ ((objectTypeProperty | objectTypeAdditionalPropertiesMatcher) NL+ )* )? "}"
objectTypeProperty -> decorator* ( IDENTIFIER(name) | stringComplete | multilineString ) ":" typeExpression
objectTypeAdditionalPropertiesMatcher -> decorator* "*:" typeExpression
Expand Down
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