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# Ogre::Compiler2Pass Class Reference

Compiler2Pass is a generic 2 pass compiler/assembler. More...

`#include <OgreCompiler2Pass.h>`

Inheritance diagram for Ogre::Compiler2Pass:
[legend]

List of all members.

## Public Member Functions
| Compiler2Pass ()
| constructor
virtual | ~Compiler2Pass ()
bool | compile (const String &source, const String &sourceName)
| compile the source - performs 2 passes.
virtual const String & | getClientBNFGrammer (void) const =0
| gets BNF Grammer.
virtual const String & | getClientGrammerName (void) const =0
| get the name of the BNF grammer.
## Protected Types
enum | OperationType { otUNKNOWN, otRULE, otAND, otOR, otOPTIONAL, otREPEAT, otDATA, otNOT_TEST, otINSERT_TOKEN, otEND }
enum | SystemRuleToken { _no_token_ = SystemTokenBase, _character_, _value_, _no_space_skip_ }
enum | BNF_ID { BNF_UNKOWN = 0, BNF_SYNTAX, BNF_RULE, BNF_IDENTIFIER, BNF_IDENTIFIER_RIGHT, BNF_IDENTIFIER_CHARACTERS, BNF_ID_BEGIN, BNF_ID_END, BNF_CONSTANT_BEGIN, BNF_SET_RULE, BNF_EXPRESSION, BNF_AND_TERM, BNF_OR_TERM, BNF_TERM, BNF_TERM_ID, BNF_CONSTANT, BNF_OR, BNF_TERMINAL_SYMBOL, BNF_TERMINAL_START, BNF_REPEAT_EXPRESSION, BNF_REPEAT_BEGIN, BNF_REPEAT_END, BNF_SET, BNF_SET_BEGIN, BNF_SET_END, BNF_NOT_TEST, BNF_NOT_TEST_BEGIN, BNF_CONDITIONAL_TOKEN_INSERT, BNF_OPTIONAL_EXPRESSION, BNF_NOT_EXPRESSION, BNF_NOT_CHK, BNF_OPTIONAL_BEGIN, BNF_OPTIONAL_END, BNF_NO_TOKEN_START, BNF_SINGLEQUOTE, BNF_SINGLE_QUOTE_EXC, BNF_SET_END_EXC, BNF_ANY_CHARACTER, BNF_SPECIAL_CHARACTERS1, BNF_SPECIAL_CHARACTERS2, BNF_WHITE_SPACE_CHK, BNF_LETTER, BNF_LETTER_DIGIT, BNF_DIGIT, BNF_WHITE_SPACE, BNF_ALPHA_SET, BNF_NUMBER_SET, BNF_SPECIAL_CHARACTER_SET1, BNF_SPECIAL_CHARACTER_SET2, BNF_SPECIAL_CHARACTER_SET3, BNF_NOT_CHARS, BNF_AUTOTOKENSTART }
typedef std::vector < TokenRule > | TokenRuleContainer
typedef TokenRuleContainer::iterator | TokenRuleIterator
typedef std::vector < LexemeTokenDef > | LexemeTokenDefContainer
typedef LexemeTokenDefContainer::iterator | LexemeTokenDefIterator
typedef std::map < std::string, size_t > | LexemeTokenMap
typedef LexemeTokenMap::iterator | TokenKeyIterator
typedef std::vector < TokenInst > | TokenInstContainer
typedef TokenInstContainer::iterator | TokenInstIterator
typedef std::map < size_t, String > | LabelContainer
| storage container for string labels defined in source container uses Token index as a key associated with a label
## Protected Member Functions
bool | doPass1 ()
| perform pass 1 of compile process scans source for lexemes that can be tokenized and then performs general semantic and context verification on each lexeme before it is tokenized.
bool | doPass2 ()
| performs Pass 2 of compile process which is execution of the tokens
virtual void | executeTokenAction (const size_t tokenID)=0
| execute the action associated with the token pointed to by the Pass 2 token instruction position.
virtual size_t | getAutoTokenIDStart () const =0
| Get the start ID for auto generated token IDs.
virtual void | setupTokenDefinitions (void)=0
| setup client token definitions.
const TokenInst & | getNextToken (const size_t expectedTokenID=0) const
| Gets the next token from the instruction que.
const TokenInst & | getCurrentToken (const size_t expectedTokenID=0) const
| Gets the current token from the instruction que.
bool | testNextTokenID (const size_t expectedTokenID) const
| If a next token instruction exist then test if its token ID matches.
bool | testCurrentTokenID (const size_t expectedTokenID) const
| If a current token instruction exist then test if its token ID matches.
void | skipToken (void) const
| skip to the next token in the pass2 queue.
void | replaceToken (void)
| go back to the previous token in the pass2 queue.
float | getNextTokenValue (void) const
| Gets the next token's associated floating point value in the instruction que that was parsed from the text source.
float | getCurrentTokenValue (void) const
| Gets the current token's associated floating point value in the instruction que that was parsed from the text source.
const String & | getNextTokenLabel (void) const
| Gets the next token's associated text label in the instruction que that was parsed from the text source.
const String & | getCurrentTokenLabel (void) const
| Gets the next token's associated text label in the instruction que that was parsed from the text source.
size_t | getNextTokenID (void) const
| Get the next token's ID value.
size_t | getCurrentTokenID (void) const
| Get the current token's ID value.
const String & | getNextTokenLexeme (void) const
| Get the next token's lexeme string.
const String & | getCurrentTokenLexeme (void) const
| Get the current token's lexeme string.
size_t | getPass2TokenQueCount (void) const
| Gets the number of tokens waiting in the instruction que that need to be processed by an token action in pass 2.
size_t | getRemainingTokensForAction (void) const
| Get the number of tokens not processed by action token.
void | setPass2TokenQuePosition (size_t pos, const bool activateAction=false)
| Manualy set the Pass2 Token que position.
size_t | getPass2TokenQuePosition (void) const
| Get the current position in the Pass2 Token Que.
bool | setNextActionQuePosition (size_t pos, const bool search=false)
| Set the position of the next token action in the Pass2 Token Que.
size_t | addLexemeToken (const String &lexeme, const size_t token, const bool hasAction=false, const bool caseSensitive=false)
| Add a lexeme token association.
void | setClientBNFGrammer (void)
| Sets up the parser rules for the client based on the BNF Grammer text passed in.
void | findEOL ()
| find the eol charater
bool | isFloatValue (float &fvalue, size_t &charsize) const
| check to see if the text at the present position in the source is a numerical constant
bool | isCharacterLabel (const size_t rulepathIDX)
| Check if source at current position is supposed to be a user defined character label.
bool | isLexemeMatch (const String &lexeme, const bool caseSensitive) const
| check to see if the text is in the lexeme text library
bool | isEndOfSource () const
| Check if pass 1 has parsed to the end of the source.
bool | positionToNextLexeme ()
| position to the next possible valid sysmbol
bool | processRulePath (size_t rulepathIDX)
| process input source text using rulepath to determine allowed tokens
void | setActiveContexts (const uint contexts)
| setup ActiveContexts - should be called by subclass to setup initial language contexts
void | skipComments ()
| comment specifiers are hard coded
void | skipEOL ()
| find end of line marker and move past it
void | skipWhiteSpace ()
| skip all the white space which includes spaces and tabs
bool | ValidateToken (const size_t rulepathIDX, const size_t activeRuleID)
| check if current position in source has the lexeme text equivalent to the TokenID
void | verifyTokenRuleLinks (const String &grammerName)
| scan through all the rules and initialize token definition with index to rules for non-terminal tokens.
void | checkTokenActionTrigger (void)
| Checks the last token instruction and if it has an action then it triggers the action of the previously found token having an action.
String | getBNFGrammerTextFromRulePath (size_t ruleID, const size_t level=0)
| Get the text representation of the rule path.
## Protected Attributes
TokenState * | mClientTokenState
TokenState * | mActiveTokenState
| Active token que, definitions, rules currntly being used by parser.
size_t | mPass2TokenQuePosition
| the location within the token instruction container where pass 2 is
size_t | mPreviousActionQuePosition
| the que position of the previous token that had an action.
size_t | mNextActionQuePosition
| the que position for the next token that has an action.
const String * | mSource
| pointer to the source to be compiled
String | mSourceName
| name of the source to be compiled
size_t | mEndOfSource
size_t | mCurrentLine
size_t | mCharPos
| current line number in source being tokenized
size_t | mErrorCharPos
| position in current line in source being tokenized
std::map< size_t, float > | mConstants
| character position in source where last error occured
LabelContainer | mLabels
bool | mLabelIsActive
| flag indicates when a label is being parsed.
size_t | mActiveLabelKey
| the key of the active label being built during pass 1.
String * | mActiveLabel
| The active label that is receiving characters during pass 1.
bool | mNoSpaceSkip
| flag being true indicates that spaces are not to be skipped automatically gets set to false when mLabelIsActive goes to false
bool | mNoTerminalToken
| if flag is true then next terminal token is not added to token que if found but does effect rule path flow
size_t | mInsertTokenID
| TokenID to insert if next rule finds a terminal token if zero then no token inserted.
uint | mActiveContexts
| Active Contexts pattern used in pass 1 to determine which tokens are valid for a certain context.
## Static Protected Attributes
static const size_t | SystemTokenBase = 1000
## Private Types
typedef std::map < String, TokenState > | TokenStateContainer
## Private Member Functions
void | activatePreviousTokenAction (void)
| if a previous token action was setup then activate it now
void | initBNFCompiler (void)
| initialize token definitions and rule paths
void | buildClientBNFRulePaths (void)
| Convert BNF grammer token que created in pass 1 into a BNF rule path.
void | modifyLastRule (const OperationType pendingRuleOp, const size_t tokenID)
| modify the last rule in the container. An end operation is added to the rule path.
size_t | getClientLexemeTokenID (const String &lexeme, const bool isCaseSensitive=false)
| get the token ID for a lexeme in the client state.
void | extractNonTerminal (const OperationType pendingRuleOp)
| Extract a Non Terminal identifier from the token que.
void | extractTerminal (const OperationType pendingRuleOp, const bool notoken=false)
| Extract a Terminal lexeme from the token que and add to current rule expression.
void | extractSet (const OperationType pendingRuleOp)
| Extract a set from the token que and add to current rule expression.
void | extractNumericConstant (const OperationType pendingRuleOp)
| Extract a numeric constant from the token que and add it to the current rule expression.
void | setConditionalTokenInsert (void)
| changes previous terminal token rule into a conditional terminal token insert rule
String | getLexemeText (size_t &ruleID, const size_t level=0)
| get the lexeme text of a rule.
## Static Private Attributes
static TokenState | mBNFTokenState
static TokenStateContainer | mClientTokenStates
## Classes
struct | LexemeTokenDef
| structure used to build lexeme Type library More...
struct | TokenInst
| map used to lookup client token based on previously defined lexeme More...
struct | TokenRule
| structure used to build rule paths More...
struct | TokenState

## Detailed Description

Compiler2Pass is a generic 2 pass compiler/assembler.

Remarks:
  provides a tokenizer in pass 1 and relies on the subclass to provide the virtual method for pass 2

PASS 1 - tokenize source: this is a simple brute force lexical scanner/analyzer that also parses the formed token for proper semantics and context in one pass it uses top down (recursive descent) ruling based on Backus - Naur Form (BNF) notation for semantic checking.

During Pass1, if a terminal token is identified as having an action then that action gets triggered when the next terminal token is uncountered that has an action.

PASS 2 - generate application specific instructions ie native instructions based on the tokens in the instruction container.

  this class must be subclassed with the subclass providing some implementation details for Pass 2. The subclass is responsible for setting up the token libraries along with defining the language syntax and handling token actions during the second pass.

  The sub class normally supplies a simplified BNF text description in its constructor prior to doing any parsing/tokenizing of source. The simplified BNF text description defines the language syntax and rule structure. The meta-symbols used in the BNF text description are:

  ::= meaning "is defined as". "::=" starts the definition of a rule. The left side of ::= must contain an <identifier>

  <> angle brackets are used to surround syntax rule names. A syntax rule name is also called a non-terminal in that it does not generate a terminal token in the instruction container for pass 2 processing.

  | meaning "or". if the item on the left of the | fails then the item on the right is tested. Example: <true_false> ::= 'true' | 'false'; whitespace is used to imply AND operation between left and right items. Example: <terrain_shadaws> ::= 'terrain_shadows' <true_false> the 'terrain_shadows' terminal token must be found and <true_false> rule must pass in order for <terrain_shadows> rule to pass.

  [] optional rule identifier is enclosed in meta symbols [ and ]. Note that only one identifier or terminal token can take [] modifier.

  {} repetitive identifier (zero or more times) is enclosed in meta symbols { and } Note that only one identifier or terminal token can take {} modifier.

  '' terminal tokens are surrounded by single quotes. A terminal token is always one or more characters. For example: 'Colour' defines a character sequence that must be matched in whole. Note that matching is case sensitive.

  @ turn on single character scanning and don't skip white space. Mainly used for label processing that allow white space. Example: '@ ' prevents the white space between the quotes from being skipped

  -'' no terminal token is generated when a - precedes the first single quote but the text in between the quotes is still tested against the characters in the source being parsed.

  (?! ) negative lookahead (not test) inspired by Perl 5. Scans ahead for a non-terminal or terminal expression that should fail in order to make the rule production pass. Does not generate a token or advance the cursur. If the lookahead result fails ie token is found, then the current rule fails and rollback occurs. Mainly used to solve multiple contexts of a token. An Example of where not test is used to solve multiple contexts:

<rule> ::= <identifier> "::=" <expression>
<expression> ::= <and_term> { <or_term> }
<or_term> ::= "|" <and_term>
<and_term> ::= { }
::= <identifier_right> | <terminal_symbol> | <repeat_expression> | <optional_expression>
<identifier_right> ::= <identifier> (?!"::=")

<identiefier> appears on both sides of the ::= so (?!"::=") test to make sure that ::= is not on the right which would indicate that a new rule was being formed.

Works on both terminals and non-terminals. Note: lookahead failure causes the whole rule to fail and rollback to occur

  <name> # indicates that a numerical value is to be parsed to form a terminal token. Name is optional and is just a descriptor to help with understanding what the value will be used for. Example: <Colour> ::= <red> <green> <blue>

  () parentheses enclose a set of characters that can be used to generate a user identifier. for example: (0123456789) matches a single character found in that set. An example of a user identifier:

  <Label> ::= <Character> {<Character>}
  <Character> ::= (abcdefghijklmnopqrstuvwxyz)

This will generate a rule that accepts one or more lowercase letters to make up the Label. The User identifier stops collecting the characters into a string when a match cannot be found in the rule.

  (! ) if the first character in the set is a ! then any input character not found in the set will be accepted. An example:

<Label> ::= <AnyCharacter_NoLineBreak> {<AnyCharacter_NoLineBreak>}
<AnyCharacter_NoLineBreak> ::= (!
)

any character but
or is accepted in the input.

  : Insert the terminal token on the left before the next terminal token on the right if the next terminal token on right parses. Usefull for when terminal tokens don't have a definate text state but only context state based on another terminal or character token. An example:

<Last_Resort> ::= 'external_command' : <Special_Label>
<Special_Label> ::= (!
)

In the example, <Last_Resort> gets processed when all other rules fail to parse. if <Special_Label> parses (reads in any character but
) then the terminal token 'external_command' is inserted prior to the Special_Label for pass 2 processing. 'external_command' does not have have an explicit text representation but based on the context of no other rules matching and <Special_Label> parsing, 'external_command' is considered parsed.

Definition at line 152 of file OgreCompiler2Pass.h.

## Member Typedef Documentation

typedef std::vector<TokenRule> Ogre::Compiler2Pass::TokenRuleContainer`[protected]`

Definition at line 174 of file OgreCompiler2Pass.h.

typedef TokenRuleContainer::iterator Ogre::Compiler2Pass::TokenRuleIterator`[protected]`

Definition at line 175 of file OgreCompiler2Pass.h.

typedef std::vector<LexemeTokenDef> Ogre::Compiler2Pass::LexemeTokenDefContainer`[protected]`

Definition at line 228 of file OgreCompiler2Pass.h.

typedef LexemeTokenDefContainer::iterator Ogre::Compiler2Pass::LexemeTokenDefIterator`[protected]`

Definition at line 229 of file OgreCompiler2Pass.h.

typedef std::map<std::string, size_t> Ogre::Compiler2Pass::LexemeTokenMap`[protected]`

Definition at line 231 of file OgreCompiler2Pass.h.

typedef LexemeTokenMap::iterator Ogre::Compiler2Pass::TokenKeyIterator`[protected]`

Definition at line 232 of file OgreCompiler2Pass.h.

typedef std::vector<TokenInst> Ogre::Compiler2Pass::TokenInstContainer`[protected]`

Definition at line 246 of file OgreCompiler2Pass.h.

typedef TokenInstContainer::iterator Ogre::Compiler2Pass::TokenInstIterator`[protected]`

Definition at line 247 of file OgreCompiler2Pass.h.

typedef std::map<size_t, String> Ogre::Compiler2Pass::LabelContainer`[protected]`

storage container for string labels defined in source container uses Token index as a key associated with a label

Definition at line 287 of file OgreCompiler2Pass.h.

typedef std::map<String, TokenState> Ogre::Compiler2Pass::TokenStateContainer`[private]`

Definition at line 607 of file OgreCompiler2Pass.h.

## Member Enumeration Documentation

enum Ogre::Compiler2Pass::OperationType`[protected]`

Enumerator:

  otUNKNOWN |
  otRULE |
  otAND |
  otOR |
  otOPTIONAL |
  otREPEAT |
  otDATA |
  otNOT_TEST |
  otINSERT_TOKEN |
  otEND |

Definition at line 158 of file OgreCompiler2Pass.h.

enum Ogre::Compiler2Pass::SystemRuleToken`[protected]`

Enumerator:

  _no_token_ |
  _character_ |
  _value_ |
  _no_space_skip_ |

Definition at line 178 of file OgreCompiler2Pass.h.

enum Ogre::Compiler2Pass::BNF_ID`[protected]`

Enumerator:

  BNF_UNKOWN |
  BNF_SYNTAX |
  BNF_RULE |
  BNF_IDENTIFIER |
  BNF_IDENTIFIER_RIGHT |
  BNF_IDENTIFIER_CHARACTERS |
  BNF_ID_BEGIN |
  BNF_ID_END |
  BNF_CONSTANT_BEGIN |
  BNF_SET_RULE |
  BNF_EXPRESSION |
  BNF_AND_TERM |
  BNF_OR_TERM |
  BNF_TERM |
  BNF_TERM_ID |
  BNF_CONSTANT |
  BNF_OR |
  BNF_TERMINAL_SYMBOL |
  BNF_TERMINAL_START |
  BNF_REPEAT_EXPRESSION |
  BNF_REPEAT_BEGIN |
  BNF_REPEAT_END |
  BNF_SET |
  BNF_SET_BEGIN |
  BNF_SET_END |
  BNF_NOT_TEST |
  BNF_NOT_TEST_BEGIN |
  BNF_CONDITIONAL_TOKEN_INSERT |
  BNF_OPTIONAL_EXPRESSION |
  BNF_NOT_EXPRESSION |
  BNF_NOT_CHK |
  BNF_OPTIONAL_BEGIN |
  BNF_OPTIONAL_END |
  BNF_NO_TOKEN_START |
  BNF_SINGLEQUOTE |
  BNF_SINGLE_QUOTE_EXC |
  BNF_SET_END_EXC |
  BNF_ANY_CHARACTER |
  BNF_SPECIAL_CHARACTERS1 |
  BNF_SPECIAL_CHARACTERS2 |
  BNF_WHITE_SPACE_CHK |
  BNF_LETTER |
  BNF_LETTER_DIGIT |
  BNF_DIGIT |
  BNF_WHITE_SPACE |
  BNF_ALPHA_SET |
  BNF_NUMBER_SET |
  BNF_SPECIAL_CHARACTER_SET1 |
  BNF_SPECIAL_CHARACTER_SET2 |
  BNF_SPECIAL_CHARACTER_SET3 |
  BNF_NOT_CHARS |
  BNF_AUTOTOKENSTART |

Definition at line 185 of file OgreCompiler2Pass.h.

## Constructor & Destructor Documentation

Ogre::Compiler2Pass::Compiler2Pass | ( |  | ) |

constructor

virtual Ogre::Compiler2Pass::~Compiler2Pass | ( |  | ) | `[virtual]`

Definition at line 640 of file OgreCompiler2Pass.h.

## Member Function Documentation

bool Ogre::Compiler2Pass::doPass1 | ( |  | ) | `[protected]`

perform pass 1 of compile process scans source for lexemes that can be tokenized and then performs general semantic and context verification on each lexeme before it is tokenized.

A tokenized instruction list is built to be used by Pass 2. A rule path can trigger Pass 2 execution if enough tokens have been generated in Pass 1. Pass 1 will then pass control to pass 2 temporarily until the current tokens have been consumed.

bool Ogre::Compiler2Pass::doPass2 | ( |  | ) | `[protected]`

performs Pass 2 of compile process which is execution of the tokens

Remarks:
  Pass 2 takes the token instructions generated in Pass 1 and builds the application specific instructions along with verifying symantic and context rules that could not be checked in Pass 1.

  Pass 2 execution consumes tokens and moves the Pass 2 token instruction position towards the end of the token container. Token execution can insert new tokens into the token container.

virtual void Ogre::Compiler2Pass::executeTokenAction | ( | const size_t | tokenID | ) | `[protected, pure virtual]`

execute the action associated with the token pointed to by the Pass 2 token instruction position.

Remarks:
  Its upto the child class to implement how it will associate a token key with and action. Actions should be placed at positions withing the BNF grammer (instruction que) that indicate enough tokens exist for pass 2 processing to take place.

Implemented in Ogre::MaterialScriptCompiler, Ogre::CompositorScriptCompiler, and Ogre::MaterialScriptCompiler.

virtual size_t Ogre::Compiler2Pass::getAutoTokenIDStart | ( |  | ) | const`[protected, pure virtual]`

Get the start ID for auto generated token IDs.

This is also one pass the end of manually set token IDs. Manually set Token ID are usually setup in the client code through an enum type so its best to make the last entry the auto ID start position and return this enum value. This method gets called automatically just prior to setupTokenDefinitions() to ensure that any tokens that are auto generated are placed after the manually set ones.

Implemented in Ogre::MaterialScriptCompiler, Ogre::CompositorScriptCompiler, and Ogre::MaterialScriptCompiler.

virtual void Ogre::Compiler2Pass::setupTokenDefinitions | ( | void |  | ) | `[protected, pure virtual]`

setup client token definitions.

Gets called when BNF grammer is being setup.

Implemented in Ogre::MaterialScriptCompiler, Ogre::CompositorScriptCompiler, and Ogre::MaterialScriptCompiler.

const TokenInst& Ogre::Compiler2Pass::getNextToken | ( | const size_t | expectedTokenID = `0` | ) | const`[protected]`

Gets the next token from the instruction que.

Remarks:
  If an unkown token is found then an exception is raised but the instruction pointer is still moved passed the unknown token. The subclass should catch the exception, provide an error message, and attempt recovery.

Parameters:

  | expectedTokenID | if greater than 0 then an exception is raised if tokenID does not match.

Definition at line 356 of file OgreCompiler2Pass.h.

const TokenInst& Ogre::Compiler2Pass::getCurrentToken | ( | const size_t | expectedTokenID = `0` | ) | const`[protected]`

Gets the current token from the instruction que.

Remarks:
  If an unkown token is found then an exception is raised. The subclass should catch the exception, provide an error message, and attempt recovery.

Parameters:

  | expectedTokenID | if greater than 0 then an exception is raised if tokenID does not match.

bool Ogre::Compiler2Pass::testNextTokenID | ( | const size_t | expectedTokenID | ) | const`[protected]`

If a next token instruction exist then test if its token ID matches.

Remarks:
  This method is usefull for peeking ahead during pass 2 to see if a certain token exists. If the tokens don't match or there is no next token (end of que) then false is returned.

Parameters:

  | expectedTokenID | is the ID of the token to match.

bool Ogre::Compiler2Pass::testCurrentTokenID | ( | const size_t | expectedTokenID | ) | const`[protected]`

If a current token instruction exist then test if its token ID matches.

Parameters:

  | expectedTokenID | is the ID of the token to match.

Definition at line 382 of file OgreCompiler2Pass.h.

void Ogre::Compiler2Pass::skipToken | ( | void |  | ) | const`[protected]`

skip to the next token in the pass2 queue.

void Ogre::Compiler2Pass::replaceToken | ( | void |  | ) | `[protected]`

go back to the previous token in the pass2 queue.

float Ogre::Compiler2Pass::getNextTokenValue | ( | void |  | ) | const`[protected]`

Gets the next token's associated floating point value in the instruction que that was parsed from the text source.

If an unkown token is found or no associated value was found then an exception is raised but the instruction pointer is still moved passed the unknown token. The subclass should catch the exception, provide an error message, and attempt recovery.

Definition at line 397 of file OgreCompiler2Pass.h.

float Ogre::Compiler2Pass::getCurrentTokenValue | ( | void |  | ) | const`[protected]`

Gets the current token's associated floating point value in the instruction que that was parsed from the text source.

Remarks:
  If an unkown token is found or no associated value was found then an exception is raised. The subclass should catch the exception, provide an error message, and attempt recovery.

const String& Ogre::Compiler2Pass::getNextTokenLabel | ( | void |  | ) | const`[protected]`

Gets the next token's associated text label in the instruction que that was parsed from the text source.

Remarks:
  If an unkown token is found or no associated label was found then an exception is raised but the instruction pointer is still moved passed the unknown token. The subclass should catch the exception, provide an error message, and attempt recovery.

Definition at line 416 of file OgreCompiler2Pass.h.

const String& Ogre::Compiler2Pass::getCurrentTokenLabel | ( | void |  | ) | const`[protected]`

Gets the next token's associated text label in the instruction que that was parsed from the text source.

If an unkown token is found or no associated label was found then an exception is raised. The subclass should catch the exception, provide an error message, and attempt recovery.

size_t Ogre::Compiler2Pass::getNextTokenID | ( | void |  | ) | const`[protected]`

Get the next token's ID value.

Definition at line 428 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::getCurrentTokenID | ( | void |  | ) | const`[protected]`

Get the current token's ID value.

Definition at line 431 of file OgreCompiler2Pass.h.

const String& Ogre::Compiler2Pass::getNextTokenLexeme | ( | void |  | ) | const`[protected]`

Get the next token's lexeme string.

Handy when you don't want the ID but want the string representation.

Definition at line 435 of file OgreCompiler2Pass.h.

const String& Ogre::Compiler2Pass::getCurrentTokenLexeme | ( | void |  | ) | const`[protected]`

Get the current token's lexeme string.

Handy when you don't want the ID but want the string representation.

size_t Ogre::Compiler2Pass::getPass2TokenQueCount | ( | void |  | ) | const`[protected]`

Gets the number of tokens waiting in the instruction que that need to be processed by an token action in pass 2.

size_t Ogre::Compiler2Pass::getRemainingTokensForAction | ( | void |  | ) | const`[protected]`

Get the number of tokens not processed by action token.

Client Actions should use this method to retreive the number of parameters(tokens) remaining to be processed in the action.

void Ogre::Compiler2Pass::setPass2TokenQuePosition | ( | size_t | pos,
|  | const bool | activateAction = `false` |
| ) |  |  | `[protected]`

Manualy set the Pass2 Token que position.

Remarks:
  This method will also set the position of the next token in the pass2 que that has an action ensuring that getRemainingTokensForAction works currectly. This method is useful for when the token que must be reprocessed after pass1 and the position in the que must be changed so that an action will be triggered.

Parameters:

  | pos | is the new position within the Pass2 que
  | activateAction | if set true and the token at the new position has an action then the action is activated.

size_t Ogre::Compiler2Pass::getPass2TokenQuePosition | ( | void |  | ) | const`[protected]`

Get the current position in the Pass2 Token Que.

Definition at line 465 of file OgreCompiler2Pass.h.

bool Ogre::Compiler2Pass::setNextActionQuePosition | ( | size_t | pos,
|  | const bool | search = `false` |
| ) |  |  | `[protected]`

Set the position of the next token action in the Pass2 Token Que.

Remarks:
  If the position is not within the que or there is no action associated with the token at the position in the que then NextActionQuePosition is not set.

Parameters:

  | pos | is the position in the Pass2 Token Que where the next action is.
  | search | if true then the que is searched from pos until an action is found. If the end of the que is reached and no action has been found then NextActionQuePosition is set to the end of the que and false is returned.

size_t Ogre::Compiler2Pass::addLexemeToken | ( | const String & | lexeme,
|  | const size_t | token,
|  | const bool | hasAction = `false`,
|  | const bool | caseSensitive = `false` |
| ) |  |  | `[protected]`

Add a lexeme token association.

Remarks:
  The backend compiler uses the associations between lexeme and token when building the rule base from the BNF script so all associations must be done prior to compiling a source.

Parameters:

  | lexeme | is the name of the token and use when parsing the source to determin a match for a token.
  | token | is the ID associated with the lexeme. If token is 0 then the token ID is auto generated and returned.
  | hasAction | must be set true if the client wants an action triggered when this token is generated
  | caseSensitive | should be set true if lexeme match should use case sensitivity

Returns:
  the ID of the token. Useful when auto generating token IDs.

void Ogre::Compiler2Pass::setClientBNFGrammer | ( | void |  | ) | `[protected]`

Sets up the parser rules for the client based on the BNF Grammer text passed in.

Remarks:
  Raises an exception if the grammer did not compile successfully. This method gets called when a call to compile occurs and no compiled BNF grammer exists, otherwise nothing will happen since the compiler has no rules to work with. The grammer only needs to be set once during the lifetime of the compiler unless the grammer changes.

Note:
  BNF Grammer rules are cached once the BNF grammer source is compiled. The client should never have to call this method directly.

void Ogre::Compiler2Pass::findEOL | ( |  | ) | `[protected]`

find the eol charater

bool Ogre::Compiler2Pass::isFloatValue | ( | float & | fvalue,
|  | size_t & | charsize |
| ) |  |  | const`[protected]`

check to see if the text at the present position in the source is a numerical constant

Parameters:

  | fvalue | is a reference that will receive the float value that is in the source
  | charsize | reference to receive number of characters that make of the value in the source

Returns:
  true if characters form a valid float representation false if a number value could not be extracted

bool Ogre::Compiler2Pass::isCharacterLabel | ( | const size_t | rulepathIDX | ) | `[protected]`

Check if source at current position is supposed to be a user defined character label.

A new label is processed when previous operation was not _character_ otherwise the processed character (if match was found) is added to the current label. This allows _character_ operations to be chained together to form a crude regular expression to build a label.

Parameters:

  | rulepathIDX | index into rule path database of token to validate.

Returns:
  true if token was found for character label.

bool Ogre::Compiler2Pass::isLexemeMatch | ( | const String & | lexeme,
|  | const bool | caseSensitive |
| ) |  |  | const`[protected]`

check to see if the text is in the lexeme text library

Parameters:

  | lexeme | points to begining of text where a lexem token might exist
  | caseSensitive | set to true if match should be case sensitive

Returns:
  true if a matching token could be found in the token type library false if could not be tokenized

bool Ogre::Compiler2Pass::isEndOfSource | ( |  | ) | const`[protected]`

Check if pass 1 has parsed to the end of the source.

Definition at line 533 of file OgreCompiler2Pass.h.

bool Ogre::Compiler2Pass::positionToNextLexeme | ( |  | ) | `[protected]`

position to the next possible valid sysmbol

bool Ogre::Compiler2Pass::processRulePath | ( | size_t | rulepathIDX | ) | `[protected]`

process input source text using rulepath to determine allowed tokens

Remarks:
  the method is reentrant and recursive if a non-terminal token is encountered in the current rule path then the method is called using the new rule path referenced by the non-terminal token Tokens can have the following operation states which effects the flow path of the rule RULE: defines a rule path for the non-terminal token AND: the token is required for the rule to pass OR: if the previous tokens failed then try these ones OPTIONAL: the token is optional and does not cause the rule to fail if the token is not found REPEAT: the token is required but there can be more than one in a sequence DATA: Used by a previous token ie for character sets NOTTEST: performs negative lookahead ie make sure the next token is not of a certain type END: end of the rule path - the method returns the succuss of the rule

Parameters:

  | rulepathIDX | index into an array of Token Rules that define a rule path to be processed

Returns:
  true if rule passed - all required tokens found false if one or more tokens required to complete the rule were not found

void Ogre::Compiler2Pass::setActiveContexts | ( | const uint | contexts | ) | `[protected]`

setup ActiveContexts - should be called by subclass to setup initial language contexts

Definition at line 561 of file OgreCompiler2Pass.h.

void Ogre::Compiler2Pass::skipComments | ( |  | ) | `[protected]`

comment specifiers are hard coded

void Ogre::Compiler2Pass::skipEOL | ( |  | ) | `[protected]`

find end of line marker and move past it

void Ogre::Compiler2Pass::skipWhiteSpace | ( |  | ) | `[protected]`

skip all the white space which includes spaces and tabs

bool Ogre::Compiler2Pass::ValidateToken | ( | const size_t | rulepathIDX,
|  | const size_t | activeRuleID |
| ) |  |  | `[protected]`

check if current position in source has the lexeme text equivalent to the TokenID

Parameters:

  | rulepathIDX | index into rule path database of token to validate
  | activeRuleID | index of non-terminal rule that generated the token

Returns:
  true if token was found false if token lexeme text does not match the source text if token is non-terminal then processRulePath is called

void Ogre::Compiler2Pass::verifyTokenRuleLinks | ( | const String & | grammerName | ) | `[protected]`

scan through all the rules and initialize token definition with index to rules for non-terminal tokens.

Gets called when internal grammer is being verified or after client grammer has been parsed.

Parameters:

  | grammerName | is the name of the grammer the token rules are for

void Ogre::Compiler2Pass::checkTokenActionTrigger | ( | void |  | ) | `[protected]`

Checks the last token instruction and if it has an action then it triggers the action of the previously found token having an action.

String Ogre::Compiler2Pass::getBNFGrammerTextFromRulePath | ( | size_t | ruleID,
|  | const size_t | level = `0` |
| ) |  |  | `[protected]`

Get the text representation of the rule path.

This is a good way to way to visually verify that the BNF grammer did compile correctly.

Parameters:

  | ruleID | is the index into the rule path.
  | level | is the number of levels a non-terminal will expand to. Defaults to 0 if not set which will cause non-terminals to not expand.

void Ogre::Compiler2Pass::activatePreviousTokenAction | ( | void |  | ) | `[private]`

if a previous token action was setup then activate it now

void Ogre::Compiler2Pass::initBNFCompiler | ( | void |  | ) | `[private]`

initialize token definitions and rule paths

void Ogre::Compiler2Pass::buildClientBNFRulePaths | ( | void |  | ) | `[private]`

Convert BNF grammer token que created in pass 1 into a BNF rule path.

void Ogre::Compiler2Pass::modifyLastRule | ( | const OperationType | pendingRuleOp,
|  | const size_t | tokenID |
| ) |  |  | `[private]`

modify the last rule in the container. An end operation is added to the rule path.

size_t Ogre::Compiler2Pass::getClientLexemeTokenID | ( | const String & | lexeme,
|  | const bool | isCaseSensitive = `false` |
| ) |  |  | `[private]`

get the token ID for a lexeme in the client state.

If the lexeme is not found then it is added to the map and definition container and a new tokenID created.

Returns:
  the ID of the token.

void Ogre::Compiler2Pass::extractNonTerminal | ( | const OperationType | pendingRuleOp | ) | `[private]`

Extract a Non Terminal identifier from the token que.

void Ogre::Compiler2Pass::extractTerminal | ( | const OperationType | pendingRuleOp,
|  | const bool | notoken = `false` |
| ) |  |  | `[private]`

Extract a Terminal lexeme from the token que and add to current rule expression.

void Ogre::Compiler2Pass::extractSet | ( | const OperationType | pendingRuleOp | ) | `[private]`

Extract a set from the token que and add to current rule expression.

void Ogre::Compiler2Pass::extractNumericConstant | ( | const OperationType | pendingRuleOp | ) | `[private]`

Extract a numeric constant from the token que and add it to the current rule expression.

void Ogre::Compiler2Pass::setConditionalTokenInsert | ( | void |  | ) | `[private]`

changes previous terminal token rule into a conditional terminal token insert rule

String Ogre::Compiler2Pass::getLexemeText | ( | size_t & | ruleID,
|  | const size_t | level = `0` |
| ) |  |  | `[private]`

get the lexeme text of a rule.

bool Ogre::Compiler2Pass::compile | ( | const String & | source,
|  | const String & | sourceName |
| ) |  |  |

compile the source - performs 2 passes.

First pass is to tokinize, check semantics and context. The second pass is performed by using tokens to look up function implementors and executing them which convert tokens to application specific instructions.

Remarks:
  Pass 2 only gets executed if Pass 1 has built enough tokens to complete a rule path and found no errors

Parameters:

  | source | a pointer to the source text to be compiled

Returns:
  true if Pass 1 and Pass 2 are successfull false if any errors occur in Pass 1 or Pass 2

Referenced by Ogre::CompositorScriptCompiler::parseScript().

virtual const String& Ogre::Compiler2Pass::getClientBNFGrammer | ( | void |  | ) | const`[pure virtual]`

gets BNF Grammer.

Gets called when BNF grammer has to be compiled for the first time.

Implemented in Ogre::MaterialScriptCompiler, Ogre::CompositorScriptCompiler, and Ogre::MaterialScriptCompiler.

virtual const String& Ogre::Compiler2Pass::getClientGrammerName | ( | void |  | ) | const`[pure virtual]`

get the name of the BNF grammer.

Implemented in Ogre::MaterialScriptCompiler, Ogre::CompositorScriptCompiler, and Ogre::MaterialScriptCompiler.

## Member Data Documentation

const size_t Ogre::Compiler2Pass::SystemTokenBase = 1000`[static, protected]`

Definition at line 177 of file OgreCompiler2Pass.h.

TokenState* Ogre::Compiler2Pass::mClientTokenState`[protected]`

Definition at line 258 of file OgreCompiler2Pass.h.

TokenState* Ogre::Compiler2Pass::mActiveTokenState`[protected]`

Active token que, definitions, rules currntly being used by parser.

Definition at line 261 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::mPass2TokenQuePosition`[mutable, protected]`

the location within the token instruction container where pass 2 is

Definition at line 263 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::mPreviousActionQuePosition`[protected]`

the que position of the previous token that had an action.

A token's action is fired on the next token having an action.

Definition at line 267 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::mNextActionQuePosition`[protected]`

the que position for the next token that has an action.

Definition at line 270 of file OgreCompiler2Pass.h.

const String* Ogre::Compiler2Pass::mSource`[protected]`

pointer to the source to be compiled

Definition at line 273 of file OgreCompiler2Pass.h.

String Ogre::Compiler2Pass::mSourceName`[protected]`

name of the source to be compiled

Definition at line 275 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::mEndOfSource`[protected]`

Definition at line 276 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::mCurrentLine`[protected]`

Definition at line 278 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::mCharPos`[protected]`

current line number in source being tokenized

Definition at line 279 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::mErrorCharPos`[protected]`

position in current line in source being tokenized

Definition at line 280 of file OgreCompiler2Pass.h.

std::map<size_t, float> Ogre::Compiler2Pass::mConstants`[protected]`

character position in source where last error occured

storage container for constants defined in source container uses Token index as a key associated with a float constant

Definition at line 284 of file OgreCompiler2Pass.h.

LabelContainer Ogre::Compiler2Pass::mLabels`[protected]`

Definition at line 288 of file OgreCompiler2Pass.h.

bool Ogre::Compiler2Pass::mLabelIsActive`[protected]`

flag indicates when a label is being parsed.

It gets set false when a terminal token not of _character_ is encountered

Definition at line 291 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::mActiveLabelKey`[protected]`

the key of the active label being built during pass 1.

a new key is calculated when mLabelIsActive switches from false to true

Definition at line 294 of file OgreCompiler2Pass.h.

String* Ogre::Compiler2Pass::mActiveLabel`[protected]`

The active label that is receiving characters during pass 1.

Definition at line 296 of file OgreCompiler2Pass.h.

bool Ogre::Compiler2Pass::mNoSpaceSkip`[protected]`

flag being true indicates that spaces are not to be skipped automatically gets set to false when mLabelIsActive goes to false

Definition at line 299 of file OgreCompiler2Pass.h.

bool Ogre::Compiler2Pass::mNoTerminalToken`[protected]`

if flag is true then next terminal token is not added to token que if found but does effect rule path flow

Definition at line 302 of file OgreCompiler2Pass.h.

size_t Ogre::Compiler2Pass::mInsertTokenID`[protected]`

TokenID to insert if next rule finds a terminal token if zero then no token inserted.

Definition at line 305 of file OgreCompiler2Pass.h.

uint Ogre::Compiler2Pass::mActiveContexts`[protected]`

Active Contexts pattern used in pass 1 to determine which tokens are valid for a certain context.

Definition at line 308 of file OgreCompiler2Pass.h.

TokenState Ogre::Compiler2Pass::mBNFTokenState`[static, private]`

Definition at line 605 of file OgreCompiler2Pass.h.

TokenStateContainer Ogre::Compiler2Pass::mClientTokenStates`[static, private]`

Definition at line 608 of file OgreCompiler2Pass.h.

The documentation for this class was generated from the following file:

- OgreCompiler2Pass.h

Copyright © 2000-2005 by The OGRE Team
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Mon Jun 16 12:49:21 2008