-
Notifications
You must be signed in to change notification settings - Fork 94
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #442 from Ladicek/parse-type
Add Type.parse()
- Loading branch information
Showing
5 changed files
with
377 additions
and
6 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| package org.jboss.jandex; | ||
|
|
||
| import java.util.Objects; | ||
|
|
||
| // see Type.parse() for the grammar | ||
| class TypeParser { | ||
| private final String str; | ||
|
|
||
| private int pos = 0; | ||
|
|
||
| TypeParser(String str) { | ||
| this.str = Objects.requireNonNull(str); | ||
| } | ||
|
|
||
| Type parse() { | ||
| Type result; | ||
|
|
||
| String token = nextToken(); | ||
| if (token.isEmpty()) { | ||
| throw unexpected(token); | ||
| } else if (token.equals("void")) { | ||
| result = VoidType.VOID; | ||
| } else if (isPrimitiveType(token) && peekToken().isEmpty()) { | ||
| result = PrimitiveType.decode(token); | ||
| } else { | ||
| result = parseReferenceType(token); | ||
| } | ||
|
|
||
| expect(""); | ||
| return result; | ||
| } | ||
|
|
||
| private Type parseReferenceType(String token) { | ||
| if (isPrimitiveType(token)) { | ||
| PrimitiveType primitive = PrimitiveType.decode(token); | ||
| return parseArrayType(primitive); | ||
| } else if (isClassType(token)) { | ||
| Type result = ClassType.create(token); | ||
| if (peekToken().equals("<")) { | ||
| expect("<"); | ||
| ParameterizedType.Builder builder = ParameterizedType.builder(result.name()); | ||
| builder.addArgument(parseTypeArgument()); | ||
| while (peekToken().equals(",")) { | ||
| expect(","); | ||
| builder.addArgument(parseTypeArgument()); | ||
| } | ||
| expect(">"); | ||
| result = builder.build(); | ||
| } | ||
| if (peekToken().equals("[")) { | ||
| return parseArrayType(result); | ||
| } | ||
| return result; | ||
| } else { | ||
| throw unexpected(token); | ||
| } | ||
| } | ||
|
|
||
| private Type parseArrayType(Type elementType) { | ||
| expect("["); | ||
| expect("]"); | ||
| int dimensions = 1; | ||
| while (peekToken().equals("[")) { | ||
| expect("["); | ||
| expect("]"); | ||
| dimensions++; | ||
| } | ||
| return ArrayType.create(elementType, dimensions); | ||
| } | ||
|
|
||
| private Type parseTypeArgument() { | ||
| String token = nextToken(); | ||
| if (token.equals("?")) { | ||
| if (peekToken().equals("extends")) { | ||
| expect("extends"); | ||
| Type bound = parseReferenceType(nextToken()); | ||
| return WildcardType.createUpperBound(bound); | ||
| } else if (peekToken().equals("super")) { | ||
| expect("super"); | ||
| Type bound = parseReferenceType(nextToken()); | ||
| return WildcardType.createLowerBound(bound); | ||
| } else { | ||
| return WildcardType.UNBOUNDED; | ||
| } | ||
| } else { | ||
| return parseReferenceType(token); | ||
| } | ||
| } | ||
|
|
||
| private boolean isPrimitiveType(String token) { | ||
| return token.equals("boolean") | ||
| || token.equals("byte") | ||
| || token.equals("short") | ||
| || token.equals("int") | ||
| || token.equals("long") | ||
| || token.equals("float") | ||
| || token.equals("double") | ||
| || token.equals("char"); | ||
| } | ||
|
|
||
| private boolean isClassType(String token) { | ||
| return !token.isEmpty() && Character.isJavaIdentifierStart(token.charAt(0)); | ||
| } | ||
|
|
||
| // --- | ||
|
|
||
| private void expect(String expected) { | ||
| String token = nextToken(); | ||
| if (!expected.equals(token)) { | ||
| throw unexpected(token); | ||
| } | ||
| } | ||
|
|
||
| private IllegalArgumentException unexpected(String token) { | ||
| if (token.isEmpty()) { | ||
| throw new IllegalArgumentException("Unexpected end of input: " + str); | ||
| } | ||
| return new IllegalArgumentException("Unexpected token '" + token + "' at position " + (pos - token.length()) | ||
| + ": " + str); | ||
| } | ||
|
|
||
| private String peekToken() { | ||
| // skip whitespace | ||
| while (pos < str.length() && Character.isWhitespace(str.charAt(pos))) { | ||
| pos++; | ||
| } | ||
|
|
||
| // end of input | ||
| if (pos == str.length()) { | ||
| return ""; | ||
| } | ||
|
|
||
| int pos = this.pos; | ||
|
|
||
| // current char is a token on its own | ||
| if (isSpecial(str.charAt(pos))) { | ||
| return str.substring(pos, pos + 1); | ||
| } | ||
|
|
||
| // token is a keyword or fully qualified name | ||
| int begin = pos; | ||
| while (pos < str.length() && Character.isJavaIdentifierStart(str.charAt(pos))) { | ||
| do { | ||
| pos++; | ||
| } while (pos < str.length() && Character.isJavaIdentifierPart(str.charAt(pos))); | ||
|
|
||
| if (pos < str.length() && str.charAt(pos) == '.') { | ||
| pos++; | ||
| } else { | ||
| return str.substring(begin, pos); | ||
| } | ||
| } | ||
|
|
||
| if (pos == str.length()) { | ||
| throw new IllegalArgumentException("Unexpected end of input: " + str); | ||
| } | ||
| throw new IllegalArgumentException("Unexpected character '" + str.charAt(pos) + "' at position " + pos + ": " + str); | ||
| } | ||
|
|
||
| private String nextToken() { | ||
| String result = peekToken(); | ||
| pos += result.length(); | ||
| return result; | ||
| } | ||
|
|
||
| private boolean isSpecial(char c) { | ||
| return c == ',' || c == '?' || c == '<' || c == '>' || c == '[' || c == ']'; | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.