[Indigo]<CaminoReal>ParserImpl.mesa!9

ParserImpl.mesa

Last Edited by: Arnon, July 19, 1985 2:54:46 pm PDT

DIRECTORY

Rope,

IO,

Convert,

MathDisplayExpr,

Parser;

ParserImpl: CEDAR PROGRAM

IMPORTS Convert, Rope

EXPORTS Parser

= BEGIN OPEN Parser;

Signals & Errors

parseError: PUBLIC ERROR = CODE;

Type Abbreviations From Imported Interfaces

ROPE: TYPE ~ Rope.ROPE;

DisplayExpr: TYPE ~ MathDisplayExpr.DisplayExpr;

Procs

LexChar: PUBLIC PROC[c: CHAR] RETURNS[LexType] ~ {

effects: Returns the lexical type of c

RETURN[

SELECT c FROM

IN ['0..'9] => digit,

IN ['a..'z] => lcAlpha,

IN ['A..'Z], '%, '$, '@, '\134 => ucAlpha,

'. => decimalPoint,

'? => templateDelimiter,

'[, '\005 => leftBracket,

'% => symbolDelimiter,

'+, '— , '-, '*, '/, '^, '←, '{, '(, '!, '$, '@, '&, '|, '~, '=, '>, '<, '#, '' => singleCharTemplate,

'\010 => backSpace,

ENDCASE => other

];

};

1/15/87 - Control characters typed by holding down the control key will be processed through the tip table, but hitting the backspace key should bring us through here

this pointless extra level of indirection proves that variants LOSE BIG TIME in Cedar

oh, what I'd give for CLU oneof's...

ParseKBChar: PUBLIC PROC[c: CHAR, inBuffer: KbBuffer, primaryActive, keyboardActive: BOOL ← FALSE] RETURNS [outBuffer: KbBuffer, action: ParseAction ← NIL] ~ {

modifies: kbBuffer, message window, $keyboard selection

effects: Parses c w.r.t contents of kbBuffer.

Updates kbBuffer, message window, and $keyboard selection (viewer & expr).

local declarations

lexC: LexType ← LexChar[c]; -- lexical type of character c

ropeC: Rope.ROPE ← Convert.RopeFromChar[c, FALSE]; -- rope equivalent of char c

kbBuffer: KbBuffer ← inBuffer;

SELECT lexC FROM

singleCharTemplate => {

wrapAround: ATOM ← IF primaryActive THEN $primary ELSE $keyboard;

SELECT c FROM

'+ => action ← NEW[WrapAction ← [wrap[wrapAround, $sum]]];

'— => action ← NEW[WrapAction ← [wrap[wrapAround, $difference]]];

'- => action ← NEW[WrapAction ← [wrap[wrapAround, $negation]]];

'* => action ← NEW[WrapAction ← [wrap[wrapAround, $product]]];

'/ => action ← NEW[WrapAction ← [wrap[wrapAround, $fraction]]];

'^ => action ← NEW[WrapAction ← [wrap[wrapAround, $pow]]];

'← => action ← NEW[WrapAction ← [wrap[wrapAround, $assign]]];

'' => action ← NEW[WrapAction ← [wrap[wrapAround, $quote]]];

'{ => action ← NEW[WrapAction ← [wrap[wrapAround, $curly]]];

'( => action ← NEW[WrapAction ← [wrap[wrapAround, $paren]]];

'[ => action ← NEW[WrapAction ← [wrap[wrapAround, $square]]];

'! => action ← NEW[WrapAction ← [wrap[wrapAround, $factorial]]];

'$ => action ← NEW[WrapAction ← [wrap[wrapAround, $exists]]];

'@ => action ← NEW[WrapAction ← [wrap[wrapAround, $forAll]]];

'& => action ← NEW[WrapAction ← [wrap[wrapAround, $and]]];

'| => action ← NEW[WrapAction ← [wrap[wrapAround, $or]]];

'~ => action ← NEW[WrapAction ← [wrap[wrapAround, $not]]];

'= => action ← NEW[WrapAction ← [wrap[wrapAround, $eqFormula]]];

'> => action ← NEW[WrapAction ← [wrap[wrapAround, $gtFormula]]];

'< => action ← NEW[WrapAction ← [wrap[wrapAround, $ltFormula]]];

'# => action ← NEW[WrapAction ← [wrap[wrapAround, $notEqFormula]]];

ENDCASE => ERROR; -- check consistency with defn of singleCharTemplate

kbBuffer ← [type: none, data: "", savedWrapArg: NIL]; -- reset kbBuffer

};

templateDelimiter => SELECT kbBuffer.type FROM

templateName => { -- finishing a multiChar templateName

action ← NEW[FinishMultiCharTemplateAction ← [finishMultiCharTemplate[class]] ];

};

ENDCASE => { -- start multi-character templateName

wrapAround: ATOM ← IF primaryActive THEN $primary ELSE $keyboard;

action ← NEW[BeginMultiCharTemplateAction ← [beginMultiCharTemplate[wrapAround]] ];

};

backSpace => action ← NEW[UndoAction];

ENDCASE => SELECT keyboardActive FROM

FALSE => { -- newly active keyboard; should never be here with Templates

SELECT lexC FROM

digit => { -- replace $primary with keystroke digit

kbBuffer.type ← integer;

kbBuffer.data ← ropeC;

action ← NEW[ReplaceAction ← [replace[$primary, integer, kbBuffer.data, $keyboard]]];

};

lcAlpha, ucAlpha => { -- replace $primary with keystroke letter

kbBuffer.type ← variable;

kbBuffer.data ← ropeC;

action ← NEW[ReplaceAction ← [replace[$primary, variable, kbBuffer.data, $keyboard]]];

};

ENDCASE => action ← NEW[NoAction];

};

TRUE => { -- already active keyboard

SELECT kbBuffer.type FROM

integer => { -- extend the integer currently in KB buffer, or convert to real

SELECT lexC FROM

digit => {

kbBuffer.data ← kbBuffer.data.Cat[ropeC];

action ← NEW[ReplaceAction ←[replace[$keyboard, integer, kbBuffer.data, $keyboard]]];

};

decimalPoint => {

kbBuffer.type ← real;

kbBuffer.data ← kbBuffer.data.Cat[ropeC];

action ← NEW[ReplaceAction ← [replace[$keyboard, real, kbBuffer.data, $keyboard]]];

};

ENDCASE => action ← NEW[NoAction];

};

real => { -- extend the REAL currently in KB buffer

SELECT lexC FROM

digit => {

kbBuffer.data ← kbBuffer.data.Cat[ropeC];

action ← NEW[ReplaceAction ← [replace[$keyboard, real, kbBuffer.data, $keyboard]]];

};

ENDCASE => action ← NEW[NoAction];

};

variable => {

SELECT lexC FROM

ucAlpha, lcAlpha => { -- extend the var currently in KB buffer

kbBuffer.data ← kbBuffer.data.Cat[ropeC];

action ← NEW[ReplaceAction ← [replace[$keyboard, variable, kbBuffer.data, $keyboard]]];

};

leftBracket => { -- interpret the identifier currently in KB buffer as a (completed) templateName

action ← NEW[ReplaceAction ← [replace[$keyboard, template, name, $primary]]];

kbBuffer ← [type: none, data: "", savedWrapArg: NIL]; -- reset kbBuffer

};

ENDCASE => action ← NEW[NoAction];

};

templateName => { -- extend the templateName currently in KB buffer

SELECT lexC FROM

ucAlpha, lcAlpha, digit => {

kbBuffer.data ← kbBuffer.data.Cat[ropeC];

action ← NEW[ReplaceAction ← [replace[$keyboard, templateName, kbBuffer.data, $keyboard]]];

};

ENDCASE => action ← NEW[NoAction];

};

ENDCASE => ERROR;

};

ENDCASE => ERROR;

RETURN[kbBuffer, action];

};

ExpandAbbreviation: PUBLIC PROC [name: ROPE] RETURNS [ROPE] ~ {

SELECT TRUE FROM -- check for recognized abbreviations

Rope.Equal[name, "nRad"] => RETURN["nRadical"];

Rope.Equal[name, "partialderiv"] => RETURN["partialDeriv"];

Rope.Equal[name, "indefint"] => RETURN["indefInt"];

Rope.Equal[name, "sigma"] => RETURN["summation"];

Rope.Equal[name, "Pow"] => RETURN["pow"];

Rope.Equal[name, "Mult"] => RETURN["product"];

Rope.Equal[name, "Div"] => RETURN["fraction"];

Rope.Equal[name, "Plus"] => RETURN["sum"];

Rope.Equal[name, "Minus"] => RETURN["negation"]; -- for SMP

Rope.Equal[name, "mult"] => RETURN["product"];

Rope.Equal[name, "div"] => RETURN["fraction"];

Rope.Equal[name, "plus"] => RETURN["sum"];

Rope.Equal[name, "minus"] => RETURN["negation"]; -- for SMP

Rope.Equal[name, "Difference"] => RETURN["difference"]; -- for SMP

ENDCASE;

RETURN[name];

};

END.