332 lines
15 KiB
Plaintext
332 lines
15 KiB
Plaintext
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#*****************************************************************************
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#
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# Copyright (C) 2016 and later: Unicode, Inc. and others.
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# License & terms of use: http://www.unicode.org/copyright.html
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#
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#*****************************************************************************
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#
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# file: rbbirpt.txt
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# ICU Break Iterator Rule Parser State Table
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#
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# This state table is used when reading and parsing a set of RBBI rules
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# The rule parser uses a state machine; the data in this file define the
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# state transitions that occur for each input character.
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#
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# *** This file defines the RBBI rule grammar. This is it.
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# *** The determination of what is accepted is here.
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#
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# This file is processed by a perl script "rbbicst.pl" to produce initialized C arrays
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# that are then built with the rule parser.
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#
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# perl rbbicst.pl < rbbirpt.txt > rbbirpt.h
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#
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# Here is the syntax of the state definitions in this file:
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#
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#
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#StateName:
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# input-char n next-state ^push-state action
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# input-char n next-state ^push-state action
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# | | | | |
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# | | | | |--- action to be performed by state machine
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# | | | | See function RBBIRuleScanner::doParseActions()
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# | | | |
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# | | | |--- Push this named state onto the state stack.
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# | | | Later, when next state is specified as "pop",
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# | | | the pushed state will become the current state.
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# | | |
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# | | |--- Transition to this state if the current input character matches the input
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# | | character or char class in the left hand column. "pop" causes the next
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# | | state to be popped from the state stack.
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# | |
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# | |--- When making the state transition specified on this line, advance to the next
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# | character from the input only if 'n' appears here.
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# |
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# |--- Character or named character classes to test for. If the current character being scanned
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# matches, peform the actions and go to the state specified on this line.
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# The input character is tested sequentally, in the order written. The characters and
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# character classes tested for do not need to be mutually exclusive. The first match wins.
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#
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#
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# start state, scan position is at the beginning of the rules file, or in between two rules.
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#
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start:
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escaped term ^break-rule-end doExprStart
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white_space n start
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'^' n start-after-caret ^break-rule-end doNoChain
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'$' scan-var-name ^assign-or-rule doExprStart
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'!' n rev-option
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';' n start # ignore empty rules.
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eof exit
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default term ^break-rule-end doExprStart
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#
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# break-rule-end: Returned from doing a break-rule expression.
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#
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break-rule-end:
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';' n start doEndOfRule
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white_space n break-rule-end
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default errorDeath doRuleError
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#
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# start of a rule, after having seen a '^' (inhibits rule chain in).
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# Similar to the main 'start' state in most respects, except
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# - empty rule is an error.
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# - A second '^' is an error.
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#
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start-after-caret:
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escaped term doExprStart
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white_space n start-after-caret
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'^' errorDeath doRuleError # two '^'s
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'$' scan-var-name ^term-var-ref doExprStart
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';' errorDeath doRuleError # ^ ;
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eof errorDeath doRuleError
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default term doExprStart
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#
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# ! We've just scanned a '!', indicating either a !!key word flag or a
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# !Reverse rule.
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#
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rev-option:
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'!' n option-scan1
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default reverse-rule ^break-rule-end doReverseDir
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option-scan1:
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name_start_char n option-scan2 doOptionStart
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default errorDeath doRuleError
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option-scan2:
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name_char n option-scan2
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default option-scan3 doOptionEnd
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option-scan3:
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';' n start
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white_space n option-scan3
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default errorDeath doRuleError
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reverse-rule:
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default term ^break-rule-end doExprStart
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#
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# term. Eat through a single rule character, or a composite thing, which
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# could be a parenthesized expression, a variable name, or a Unicode Set.
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#
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term:
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escaped n expr-mod doRuleChar
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white_space n term
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rule_char n expr-mod doRuleChar
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'[' scan-unicode-set ^expr-mod
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'(' n term ^expr-mod doLParen
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'$' scan-var-name ^term-var-ref
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'.' n expr-mod doDotAny
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default errorDeath doRuleError
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#
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# term-var-ref We've just finished scanning a reference to a $variable.
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# Check that the variable was defined.
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# The variable name scanning is in common with assignment statements,
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# so the check can't be done there.
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term-var-ref:
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default expr-mod doCheckVarDef
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#
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# expr-mod We've just finished scanning a term, now look for the optional
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# trailing '*', '?', '+'
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#
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expr-mod:
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white_space n expr-mod
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'*' n expr-cont doUnaryOpStar
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'+' n expr-cont doUnaryOpPlus
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'?' n expr-cont doUnaryOpQuestion
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default expr-cont
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#
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# expr-cont Expression, continuation. At a point where additional terms are
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# allowed, but not required.
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#
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expr-cont:
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escaped term doExprCatOperator
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white_space n expr-cont
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rule_char term doExprCatOperator
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'[' term doExprCatOperator
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'(' term doExprCatOperator
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'$' term doExprCatOperator
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'.' term doExprCatOperator
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'/' look-ahead doExprCatOperator
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'{' n tag-open doExprCatOperator
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'|' n term doExprOrOperator
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')' n pop doExprRParen
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default pop doExprFinished
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#
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# look-ahead Scanning a '/', which identifies a break point, assuming that the
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# remainder of the expression matches.
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#
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# Generate a parse tree as if this was a special kind of input symbol
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# appearing in an otherwise normal concatenation expression.
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#
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look-ahead:
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'/' n expr-cont-no-slash doSlash
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default errorDeath
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#
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# expr-cont-no-slash Expression, continuation. At a point where additional terms are
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# allowed, but not required. Just like
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# expr-cont, above, except that no '/'
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# look-ahead symbol is permitted.
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#
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expr-cont-no-slash:
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escaped term doExprCatOperator
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white_space n expr-cont
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rule_char term doExprCatOperator
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'[' term doExprCatOperator
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'(' term doExprCatOperator
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'$' term doExprCatOperator
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'.' term doExprCatOperator
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'|' n term doExprOrOperator
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')' n pop doExprRParen
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default pop doExprFinished
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#
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# tags scanning a '{', the opening delimiter for a tag that identifies
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# the kind of match. Scan the whole {dddd} tag, where d=digit
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#
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tag-open:
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white_space n tag-open
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digit_char tag-value doStartTagValue
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default errorDeath doTagExpectedError
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tag-value:
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white_space n tag-close
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'}' tag-close
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digit_char n tag-value doTagDigit
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default errorDeath doTagExpectedError
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tag-close:
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white_space n tag-close
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'}' n expr-cont-no-tag doTagValue
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default errorDeath doTagExpectedError
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#
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# expr-cont-no-tag Expression, continuation. At a point where additional terms are
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# allowed, but not required. Just like
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# expr-cont, above, except that no "{ddd}"
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# tagging is permitted.
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#
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expr-cont-no-tag:
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escaped term doExprCatOperator
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white_space n expr-cont-no-tag
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rule_char term doExprCatOperator
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'[' term doExprCatOperator
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'(' term doExprCatOperator
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'$' term doExprCatOperator
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'.' term doExprCatOperator
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'/' look-ahead doExprCatOperator
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'|' n term doExprOrOperator
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')' n pop doExprRParen
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default pop doExprFinished
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#
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# Variable Name Scanning.
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#
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# The state that branched to here must have pushed a return state
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# to go to after completion of the variable name scanning.
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#
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# The current input character must be the $ that introduces the name.
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# The $ is consummed here rather than in the state that first detected it
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# so that the doStartVariableName action only needs to happen in one
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# place (here), and the other states don't need to worry about it.
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#
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scan-var-name:
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'$' n scan-var-start doStartVariableName
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default errorDeath
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scan-var-start:
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name_start_char n scan-var-body
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default errorDeath doVariableNameExpectedErr
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scan-var-body:
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name_char n scan-var-body
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default pop doEndVariableName
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#
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# scan-unicode-set Unicode Sets are parsed by the the UnicodeSet class.
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# Within the RBBI parser, after finding the first character
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# of a Unicode Set, we just hand the rule input at that
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# point of to the Unicode Set constructor, then pick
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# up parsing after the close of the set.
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#
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# The action for this state invokes the UnicodeSet parser.
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#
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scan-unicode-set:
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'[' n pop doScanUnicodeSet
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'p' n pop doScanUnicodeSet
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'P' n pop doScanUnicodeSet
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default errorDeath
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#
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# assign-or-rule. A $variable was encountered at the start of something, could be
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# either an assignment statement or a rule, depending on whether an '='
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# follows the variable name. We get to this state when the variable name
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# scanning does a return.
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#
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assign-or-rule:
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white_space n assign-or-rule
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'=' n term ^assign-end doStartAssign # variable was target of assignment
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default term-var-ref ^break-rule-end # variable was a term in a rule
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#
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# assign-end This state is entered when the end of the expression on the
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# right hand side of an assignment is found. We get here via
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# a pop; this state is pushed when the '=' in an assignment is found.
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#
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# The only thing allowed at this point is a ';'. The RHS of an
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# assignment must look like a rule expression, and we come here
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# when what is being scanned no longer looks like an expression.
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#
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assign-end:
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';' n start doEndAssign
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default errorDeath doRuleErrorAssignExpr
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#
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# errorDeath. This state is specified as the next state whenever a syntax error
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# in the source rules is detected. Barring bugs, the state machine will never
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# actually get here, but will stop because of the action associated with the error.
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# But, just in case, this state asks the state machine to exit.
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errorDeath:
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default n errorDeath doExit
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