org.checkerframework.framework.util

Class FlowExpressionParseUtil

java.lang.Object

org.checkerframework.framework.util.FlowExpressionParseUtil

public class FlowExpressionParseUtil
extends java.lang.Object

A collection of helper methods to parse a string that represents a restricted Java expression. Such expressions can be found in annotations (e.g., to specify a pre- or postcondition).

Author:

Stefan Heule

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FlowExpressionParseUtil.FlowExpressionContext Context used to parse a flow expression.
static class	FlowExpressionParseUtil.FlowExpressionParseException An exception that indicates a parse error.

Field Summary

Fields

Modifier and Type	Field and Description
protected static java.util.regex.Pattern	identifierPattern Matches an identifier
protected static java.lang.String	identifierRegex Regular expression for an identifier.
protected static java.util.regex.Pattern	intPattern Matches integer literals
protected static java.util.regex.Pattern	longPattern Matches long literals
protected static java.util.regex.Pattern	parameterPattern Matches a parameter
protected static java.lang.String	parameterRegex Regular expression for a formal parameter use.
protected static java.util.regex.Pattern	parenthesesPattern Matches an expression contained in matching start and end parentheses
protected static java.util.regex.Pattern	stringPattern Matches string literals
protected static java.lang.String	stringRegex Regular expression for a string literal.
protected static java.util.regex.Pattern	unanchoredParameterPattern Unanchored; can be used to find all formal parameter uses.

Constructor Summary

Constructors

Constructor and Description
FlowExpressionParseUtil()

Method Summary

Modifier and Type	Method and Description
static FlowExpressions.Receiver	internalReprOfVariable(AnnotatedTypeFactory provider, com.sun.source.tree.VariableTree tree)
static java.util.List<java.lang.Integer>	parameterIndices(java.lang.String s)
static FlowExpressions.Receiver	parse(java.lang.String expression, FlowExpressionParseUtil.FlowExpressionContext context, com.sun.source.util.TreePath localScope, boolean useLocalScope) Parse a string and return its representation as a FlowExpressions.Receiver, or throw an FlowExpressionParseUtil.FlowExpressionParseException.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

identifierRegex

protected static final java.lang.String identifierRegex

Regular expression for an identifier. Permits '$' in the name, though that character never appears in Java source code.

See Also:

Constant Field Values

parameterRegex

protected static final java.lang.String parameterRegex

Regular expression for a formal parameter use.

See Also:

Constant Field Values

stringRegex

protected static final java.lang.String stringRegex

Regular expression for a string literal.

See Also:

Constant Field Values

unanchoredParameterPattern

protected static final java.util.regex.Pattern unanchoredParameterPattern

Unanchored; can be used to find all formal parameter uses.

parameterPattern

protected static final java.util.regex.Pattern parameterPattern

Matches a parameter

identifierPattern

protected static final java.util.regex.Pattern identifierPattern

Matches an identifier

intPattern

protected static final java.util.regex.Pattern intPattern

Matches integer literals

longPattern

protected static final java.util.regex.Pattern longPattern

Matches long literals

stringPattern

protected static final java.util.regex.Pattern stringPattern

Matches string literals

parenthesesPattern

protected static final java.util.regex.Pattern parenthesesPattern

Matches an expression contained in matching start and end parentheses

Constructor Detail

FlowExpressionParseUtil

public FlowExpressionParseUtil()

Method Detail

parse

public static FlowExpressions.Receiver parse(java.lang.String expression,
                                             FlowExpressionParseUtil.FlowExpressionContext context,
                                             com.sun.source.util.TreePath localScope,
                                             boolean useLocalScope)
                                      throws FlowExpressionParseUtil.FlowExpressionParseException

Parse a string and return its representation as a FlowExpressions.Receiver, or throw an FlowExpressionParseUtil.FlowExpressionParseException.

Parameters:

expression - flow expression to parse

context - information about any receiver and arguments

localScope - path to local scope to use

useLocalScope - whether localScope should be used to resolve identifiers

Throws:

FlowExpressionParseUtil.FlowExpressionParseException

parameterIndices

public static java.util.List<java.lang.Integer> parameterIndices(java.lang.String s)

Returns:

a list of 1-based indices of all formal parameters that occur in s. Each formal parameter occurs in s as a string like "#1" or "#4". This routine does not do proper parsing; for instance, if "#2" appears within a string in s, then 2 would still be in the result list.

internalReprOfVariable

public static FlowExpressions.Receiver internalReprOfVariable(AnnotatedTypeFactory provider,
                                                              com.sun.source.tree.VariableTree tree)
                                                       throws FlowExpressionParseUtil.FlowExpressionParseException

Throws:

FlowExpressionParseUtil.FlowExpressionParseException