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codeql/shared/regex/codeql/regex/RegexTreeView.qll at codeql-cli-2.27.1 · github/codeql · GitHub
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/**
* This file contains a `RegexTreeViewSig` module describing the syntax tree of regular expressions.
*/
overlay
[
local?
]
module
;
/**
* A signature describing the syntax tree of regular expressions.
*/
signature
module
RegexTreeViewSig
{
/**
* An element used in some way as or in a regular expression.
* This class exists to have a common supertype that all languages can agree on.
*/
class
Top
;
/**
* An element containing a regular expression term, that is, either
* a string literal (parsed as a regular expression; the root of the parse tree)
* or another regular expression term (a descendant of the root).
*/
class
RegExpParent
extends
Top
;
/**
* A regular expression literal.
*
* Note that this class does not cover regular expressions constructed by calling the built-in
* `RegExp` function.
*
* Example:
*
* ```
* /(?i)ab*c(d|e)$/
* ```
*/
class
RegExpLiteral
extends
RegExpParent
;
/**
* A regular expression term, that is, a syntactic part of a regular expression.
* These are the tree nodes that form the parse tree of a regular expression literal.
*/
class
RegExpTerm
extends
Top
{
/** Gets a child term of this term. */
RegExpTerm
getAChild
(
)
;
/**
* Holds if this is the root term of a regular expression.
*/
predicate
isRootTerm
(
)
;
/**
* Gets the parent term of this regular expression term, or the
* regular expression literal if this is the root term.
*/
RegExpParent
getParent
(
)
;
/**
* Holds if this term is part of a regular expression literal, or a string literal
* that is interpreted as a regular expression.
*/
predicate
isUsedAsRegExp
(
)
;
/** Gets the outermost term of this regular expression. */
RegExpTerm
getRootTerm
(
)
;
/** Gets the raw source text of this term. */
string
getRawValue
(
)
;
/** Gets the `i`th child term of this term. */
RegExpTerm
getChild
(
int
i
)
;
/** Gets the number of child terms of this term. */
int
getNumChild
(
)
;
/** Gets the regular expression term that is matched (textually) after this one, if any. */
RegExpTerm
getSuccessor
(
)
;
/** Gets the last child term of this element. */
RegExpTerm
getLastChild
(
)
;
string
toString
(
)
;
predicate
hasLocationInfo
(
string
filepath
,
int
startline
,
int
startcolumn
,
int
endline
,
int
endcolumn
)
;
}
/**
* A quantified regular expression term.
*
* Example:
*
* ```
* ((ECMA|Java)[sS]cript)*
* ```
*/
class
RegExpQuantifier
extends
RegExpTerm
;
/**
* A star-quantified term.
*
* Example:
*
* ```
* \w*
* ```
*/
class
RegExpStar
extends
RegExpQuantifier
;
/**
* An optional term.
*
* Example:
*
* ```
* ;?
* ```
*/
class
RegExpOpt
extends
RegExpQuantifier
;
/**
* A plus-quantified term.
*
* Example:
*
* ```
* \w+
* ```
*/
class
RegExpPlus
extends
RegExpQuantifier
;
/**
* A range-quantified term
*
* Examples:
*
* ```
* \w{2,4}
* \w{2,}
* \w{2}
* ```
*/
class
RegExpRange
extends
RegExpQuantifier
{
/** Gets the lower bound of the range. */
int
getLowerBound
(
)
;
/**
* Gets the upper bound of the range, if any.
*
* If there is no upper bound, any number of repetitions is allowed.
* For a term of the form `r{lo}`, both the lower and the upper bound
* are `lo`.
*/
int
getUpperBound
(
)
;
}
/**
* A non-word boundary, that is, a regular expression term of the form `\B`.
*/
class
RegExpNonWordBoundary
extends
RegExpTerm
;
/**
* An escaped regular expression term, that is, a regular expression
* term starting with a backslash.
*
* Example:
*
* ```
* \.
* \w
* ```
*/
class
RegExpEscape
extends
RegExpTerm
;
/**
* A character class escape in a regular expression.
*
* Examples:
*
* ```
* \w
* \S
* ```
*/
class
RegExpCharacterClassEscape
extends
RegExpEscape
{
/** Gets the name of the character class; for example, `w` for `\w`. */
string
getValue
(
)
;
}
/**
* An alternative term, that is, a term of the form `a|b`.
*
* Example:
*
* ```
* ECMA|Java
* ```
*/
class
RegExpAlt
extends
RegExpTerm
;
/**
* A grouped regular expression.
*
* Examples:
*
* ```
* (ECMA|Java)
* (?:ECMA|Java)
* (?<quote>['"])
* ```
*/
class
RegExpGroup
extends
RegExpTerm
{
/**
* Gets the index of this capture group within the enclosing regular
* expression literal.
*
* For example, in the regular expression `/((a?).)(?:b)/`, the
* group `((a?).)` has index 1, the group `(a?)` nested inside it
* has index 2, and the group `(?:b)` has no index, since it is
* not a capture group.
*/
int
getNumber
(
)
;
/** Holds if this is a capture group. */
predicate
isCapture
(
)
;
}
/**
* A back reference, that is, a term of the form `\i` or `\k<name>`
* in a regular expression.
*
* Examples:
*
* ```
* \1
* \k<quote>
* ```
*/
class
RegExpBackRef
extends
RegExpTerm
{
/** Gets the capture group this back reference refers to. */
RegExpGroup
getGroup
(
)
;
}
/**
* A sequence term.
*
* Example:
*
* ```
* (ECMA|Java)Script
* ```
*
* This is a sequence with the elements `(ECMA|Java)` and `Script`.
*/
class
RegExpSequence
extends
RegExpTerm
;
/**
* A zero-width lookahead or lookbehind assertion.
*
* Examples:
*
* ```
* (?=\w)
* (?!\n)
* (?<=\.)
* (?<!\\)
* ```
*/
class
RegExpSubPattern
extends
RegExpTerm
{
/** Gets the lookahead term. */
RegExpTerm
getOperand
(
)
;
}
/**
* A zero-width lookahead assertion.
*
* Examples:
*
* ```
* (?=\w)
* (?!\n)
* ```
*/
class
RegExpLookahead
extends
RegExpSubPattern
;
/**
* A positive-lookahead assertion.
*
* Examples:
*
* ```
* (?=\w)
* ```
*/
class
RegExpPositiveLookahead
extends
RegExpLookahead
;
/**
* A zero-width lookbehind assertion.
*
* Examples:
*
* ```
* (?<=\.)
* (?<!\\)
* ```
*/
class
RegExpLookbehind
extends
RegExpSubPattern
;
/**
* A positive-lookbehind assertion.
*
* Examples:
*
* ```
* (?<=\.)
* ```
*/
class
RegExpPositiveLookbehind
extends
RegExpLookbehind
;
/**
* A constant regular expression term, that is, a regular expression
* term matching a single string.
*
* Example:
*
* ```
* abc
* ```
*/
class
RegExpConstant
extends
RegExpTerm
{
/** Gets the string matched by this constant term. */
string
getValue
(
)
;
/**
* Holds if this constant represents a valid Unicode character (as opposed
* to a surrogate code point that does not correspond to a character by itself.)
*/
predicate
isCharacter
(
)
;
}
/**
* A character escape in a regular expression.
*
* Example:
*
* ```
* \.
* ```
*/
class
RegExpCharEscape
extends
RegExpEscape
{
/** Gets the string matched by this term. */
string
getValue
(
)
;
}
/**
* A character class in a regular expression.
*
* Examples:
*
* ```
* [a-z_]
* [^<>&]
* ```
*/
class
RegExpCharacterClass
extends
RegExpTerm
{
/**
* Holds if this character class matches any character.
*/
predicate
isUniversalClass
(
)
;
/** Holds if this is an inverted character class, that is, a term of the form `[^...]`. */
predicate
isInverted
(
)
;
}
/**
* A character range in a character class in a regular expression.
*
* Example:
*
* ```
* a-z
* ```
*/
class
RegExpCharacterRange
extends
RegExpTerm
{
/** Holds if `lo` is the lower bound of this character range and `hi` the upper bound. */
predicate
isRange
(
string
lo
,
string
hi
)
;
}
/**
* A dot regular expression.
*
* Example:
*
* ```
* .
* ```
*/
class
RegExpDot
extends
RegExpTerm
;
/**
* A term that matches a specific position between characters in the string.
*
* Example:
*
* ```
* \A
* ```
*/
class
RegExpAnchor
extends
RegExpTerm
{
/** Gets the char for this term. */
string
getChar
(
)
;
}
/**
* A dollar assertion `$` matching the end of a line.
*
* Example:
*
* ```
* $
* ```
*/
class
RegExpDollar
extends
RegExpAnchor
;
/**
* A caret assertion `^` matching the beginning of a line.
*
* Example:
*
* ```
* ^
* ```
*/
class
RegExpCaret
extends
RegExpAnchor
;
/**
* A word boundary assertion.
*
* Example:
*
* ```
* \b
* ```
*/
class
RegExpWordBoundary
extends
RegExpTerm
;
/**
* A regular expression term that permits unlimited repetitions.
*/
class
InfiniteRepetitionQuantifier
extends
RegExpQuantifier
;
/**
* Holds if the regular expression should not be considered.
*
* For javascript we make the pragmatic performance optimization to ignore minified files.
*/
predicate
isExcluded
(
RegExpParent
parent
)
;
/**
* Holds if `term` is a possessive quantifier.
* As javascript's regexes do not support possessive quantifiers, this never holds, but is used by the shared library.
*/
predicate
isPossessive
(
RegExpQuantifier
term
)
;
/**
* Holds if the regex that `term` is part of is used in a way that ignores any leading prefix of the input it's matched against.
* Not yet implemented for JavaScript.
*/
predicate
matchesAnyPrefix
(
RegExpTerm
term
)
;
/**
* Holds if the regex that `term` is part of is used in a way that ignores any trailing suffix of the input it's matched against.
* Not yet implemented for JavaScript.
*/
predicate
matchesAnySuffix
(
RegExpTerm
term
)
;
/**
* Holds if `term` is an escape class representing e.g. `\d`.
* `clazz` is which character class it represents, e.g. "d" for `\d`.
*/
predicate
isEscapeClass
(
RegExpTerm
term
,
string
clazz
)
;
/**
* Holds if `root` has the `i` flag for case-insensitive matching.
*/
predicate
isIgnoreCase
(
RegExpTerm
root
)
;
/**
* Holds if `root` has the `s` flag for multi-line matching.
*/
predicate
isDotAll
(
RegExpTerm
root
)
;
}
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