/* $Id: parse.y,v 1.27 2003/12/19 23:23:31 slobasso Exp $ */
%{
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif

#include "parse.h"
#include "textBuf.h"
#include "nedit.h"
#include "rbTree.h"
#include "interpret.h"

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <X11/Intrinsic.h>
#include <Xm/Xm.h>
#ifdef VMS
#include "../util/VMSparam.h"
#else
#ifndef __MVS__
#include <sys/param.h>
#endif
#endif /*VMS*/

#ifdef HAVE_DEBUG_H
#include "../debug.h"
#endif

/* Macros to add error processing to AddOp and AddSym calls */
#define ADD_OP(op) if (!AddOp(op, &ErrMsg)) return 1
#define ADD_SYM(sym) if (!AddSym(sym, &ErrMsg)) return 1
#define ADD_IMMED(val) if (!AddImmediate(val, &ErrMsg)) return 1
#define ADD_BR_OFF(to) if (!AddBranchOffset(to, &ErrMsg)) return 1
#define SET_BR_OFF(from, to) *((int *)(from)) = ((Inst *)(to)) - ((Inst *)(from))

/* Max. length for a string constant (... there shouldn't be a maximum) */
#define MAX_STRING_CONST_LEN 5000

static const char CVSID[] = "$Id: parse.y,v 1.27 2003/12/19 23:23:31 slobasso Exp $";
static int yyerror(char *s);
static int yylex(void);
int yyparse(void);
static int follow(char expect, int yes, int no);
static int follow2(char expect1, int yes1, char expect2, int yes2, int no);
static int follow_non_whitespace(char expect, int yes, int no);
static Symbol *matchesActionRoutine(char **inPtr);

static char *ErrMsg;
static char *InPtr;
extern Inst *LoopStack[]; /* addresses of break, cont stmts */
extern Inst **LoopStackPtr;  /*  to fill at the end of a loop */

%}

%union {
    Symbol *sym;
    Inst *inst;
    int nArgs;
}
%token <sym> NUMBER STRING SYMBOL
%token DELETE ARG_LOOKUP
%token IF WHILE ELSE FOR BREAK CONTINUE RETURN
%type <nArgs> arglist
%type <inst> cond comastmts for while else and or arrayexpr
%type <sym> evalsym

%nonassoc IF_NO_ELSE
%nonassoc ELSE

%nonassoc SYMBOL ARG_LOOKUP
%right    '=' ADDEQ SUBEQ MULEQ DIVEQ MODEQ ANDEQ OREQ
%left     CONCAT
%left     OR
%left     AND
%left     '|'
%left     '&'
%left     GT GE LT LE EQ NE IN
%left     '+' '-'
%left     '*' '/' '%'
%nonassoc UNARY_MINUS NOT
%nonassoc DELETE
%nonassoc INCR DECR
%right    POW
%nonassoc '['
%nonassoc '('

%%      /* Rules */

program:    blank stmts {
                ADD_OP(OP_RETURN_NO_VAL); return 0;
            }
            | blank '{' blank stmts '}' {
                ADD_OP(OP_RETURN_NO_VAL); return 0;
            }
            | blank '{' blank '}' {
                ADD_OP(OP_RETURN_NO_VAL); return 0;
            }
            | error {
                return 1;
            }
            ;
block:      '{' blank stmts '}' blank
            | '{' blank '}' blank
            | stmt
            ;
stmts:      stmt
            | stmts stmt
            ;
stmt:       simpstmt '\n' blank
            | IF '(' cond ')' blank block %prec IF_NO_ELSE {
                SET_BR_OFF($3, GetPC());
            }
            | IF '(' cond ')' blank block else blank block %prec ELSE {
                SET_BR_OFF($3, ($7+1)); SET_BR_OFF($7, GetPC());
            }
            | while '(' cond ')' blank block {
                ADD_OP(OP_BRANCH); ADD_BR_OFF($1);
                SET_BR_OFF($3, GetPC()); FillLoopAddrs(GetPC(), $1);
            }
            | for '(' comastmts ';' cond ';' comastmts ')' blank block {
                FillLoopAddrs(GetPC()+2+($7-($5+1)), GetPC());
                SwapCode($5+1, $7, GetPC());
                ADD_OP(OP_BRANCH); ADD_BR_OFF($3); SET_BR_OFF($5, GetPC());
            }
            | for '(' SYMBOL IN arrayexpr ')' {
                Symbol *iterSym = InstallIteratorSymbol();
                ADD_OP(OP_BEGIN_ARRAY_ITER); ADD_SYM(iterSym);
                ADD_OP(OP_ARRAY_ITER); ADD_SYM($3); ADD_SYM(iterSym); ADD_BR_OFF(0);
            }
                blank block {
                    ADD_OP(OP_BRANCH); ADD_BR_OFF($5+2);
                    SET_BR_OFF($5+5, GetPC());
                    FillLoopAddrs(GetPC(), $5+2);
            }
            | BREAK '\n' blank {
                ADD_OP(OP_BRANCH); ADD_BR_OFF(0);
                if (AddBreakAddr(GetPC()-1)) {
                    yyerror("break outside loop"); YYERROR;
                }
            }
            | CONTINUE '\n' blank {
                ADD_OP(OP_BRANCH); ADD_BR_OFF(0);
                if (AddContinueAddr(GetPC()-1)) {
                    yyerror("continue outside loop"); YYERROR;
                }
            }
            | RETURN expr '\n' blank {
                ADD_OP(OP_RETURN);
            }
            | RETURN '\n' blank {
                ADD_OP(OP_RETURN_NO_VAL);
            }
            ;
simpstmt:   SYMBOL '=' expr {
                ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | evalsym ADDEQ expr {
                ADD_OP(OP_ADD); ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | evalsym SUBEQ expr {
                ADD_OP(OP_SUB); ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | evalsym MULEQ expr {
                ADD_OP(OP_MUL); ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | evalsym DIVEQ expr {
                ADD_OP(OP_DIV); ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | evalsym MODEQ expr {
                ADD_OP(OP_MOD); ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | evalsym ANDEQ expr {
                ADD_OP(OP_BIT_AND); ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | evalsym OREQ expr {
                ADD_OP(OP_BIT_OR); ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | DELETE arraylv '[' arglist ']' {
                ADD_OP(OP_ARRAY_DELETE); ADD_IMMED((void *)$4);
            }
            | initarraylv '[' arglist ']' '=' expr {
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | initarraylv '[' arglist ']' ADDEQ expr {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)1); ADD_IMMED((void *)$3);
                ADD_OP(OP_ADD);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | initarraylv '[' arglist ']' SUBEQ expr {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)1); ADD_IMMED((void *)$3);
                ADD_OP(OP_SUB);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | initarraylv '[' arglist ']' MULEQ expr {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)1); ADD_IMMED((void *)$3);
                ADD_OP(OP_MUL);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | initarraylv '[' arglist ']' DIVEQ expr {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)1); ADD_IMMED((void *)$3);
                ADD_OP(OP_DIV);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | initarraylv '[' arglist ']' MODEQ expr {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)1); ADD_IMMED((void *)$3);
                ADD_OP(OP_MOD);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | initarraylv '[' arglist ']' ANDEQ expr {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)1); ADD_IMMED((void *)$3);
                ADD_OP(OP_BIT_AND);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | initarraylv '[' arglist ']' OREQ expr {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)1); ADD_IMMED((void *)$3);
                ADD_OP(OP_BIT_OR);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | initarraylv '[' arglist ']' INCR {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)0); ADD_IMMED((void *)$3);
                ADD_OP(OP_INCR);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | initarraylv '[' arglist ']' DECR {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)0); ADD_IMMED((void *)$3);
                ADD_OP(OP_DECR);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$3);
            }
            | INCR initarraylv '[' arglist ']' {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)0); ADD_IMMED((void *)$4);
                ADD_OP(OP_INCR);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$4);
            }
            | DECR initarraylv '[' arglist ']' {
                ADD_OP(OP_ARRAY_REF_ASSIGN_SETUP); ADD_IMMED((void *)0); ADD_IMMED((void *)$4);
                ADD_OP(OP_DECR);
                ADD_OP(OP_ARRAY_ASSIGN); ADD_IMMED((void *)$4);
            }
            | SYMBOL '(' arglist ')' {
                ADD_OP(OP_SUBR_CALL);
                ADD_SYM(PromoteToGlobal($1)); ADD_IMMED((void *)$3);
            }
            | INCR SYMBOL {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($2); ADD_OP(OP_INCR);
                ADD_OP(OP_ASSIGN); ADD_SYM($2);
            }
            | SYMBOL INCR {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($1); ADD_OP(OP_INCR);
                ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | DECR SYMBOL {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($2); ADD_OP(OP_DECR);
                ADD_OP(OP_ASSIGN); ADD_SYM($2);
            }
            | SYMBOL DECR {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($1); ADD_OP(OP_DECR);
                ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            ;
evalsym:    SYMBOL {
                $$ = $1; ADD_OP(OP_PUSH_SYM); ADD_SYM($1);
            }
            ;
comastmts:  /* nothing */ {
                $$ = GetPC();
            }
            | simpstmt {
                $$ = GetPC();
            }
            | comastmts ',' simpstmt {
                $$ = GetPC();
            }
            ;
arglist:    /* nothing */ {
                $$ = 0;
            }
            | expr {
                $$ = 1;
            }
            | arglist ',' expr {
                $$ = $1 + 1;
            }
            ;
expr:       numexpr %prec CONCAT
            | expr numexpr %prec CONCAT {
                ADD_OP(OP_CONCAT);
            }
            ;
initarraylv:    SYMBOL {
                    ADD_OP(OP_PUSH_ARRAY_SYM); ADD_SYM($1); ADD_IMMED((void *)1);
                }
                | initarraylv '[' arglist ']' {
                    ADD_OP(OP_ARRAY_REF); ADD_IMMED((void *)$3);
                }
                ;
arraylv:    SYMBOL {
                ADD_OP(OP_PUSH_ARRAY_SYM); ADD_SYM($1); ADD_IMMED((void *)0);
            }
            | arraylv '[' arglist ']' {
                ADD_OP(OP_ARRAY_REF); ADD_IMMED((void *)$3);
            }
            ;
arrayexpr:  numexpr {
                $$ = GetPC();
            }
            ;
numexpr:    NUMBER {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($1);
            }
            | STRING {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($1);
            }
            | SYMBOL {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($1);
            }
            | SYMBOL '(' arglist ')' {
                ADD_OP(OP_SUBR_CALL);
                ADD_SYM(PromoteToGlobal($1)); ADD_IMMED((void *)$3);
                ADD_OP(OP_FETCH_RET_VAL);
            }
            | '(' expr ')'
            | ARG_LOOKUP '[' numexpr ']' {
               ADD_OP(OP_PUSH_ARG);
            }
            | ARG_LOOKUP '[' ']' {
               ADD_OP(OP_PUSH_ARG_COUNT);
            }
            | ARG_LOOKUP {
               ADD_OP(OP_PUSH_ARG_ARRAY);
            }
            | numexpr '[' arglist ']' {
                ADD_OP(OP_ARRAY_REF); ADD_IMMED((void *)$3);
            }
            | numexpr '+' numexpr {
                ADD_OP(OP_ADD);
            }
            | numexpr '-' numexpr {
                ADD_OP(OP_SUB);
            }
            | numexpr '*' numexpr {
                ADD_OP(OP_MUL);
            }
            | numexpr '/' numexpr {
                ADD_OP(OP_DIV);
            }
            | numexpr '%' numexpr {
                ADD_OP(OP_MOD);
            }
            | numexpr POW numexpr {
                ADD_OP(OP_POWER);
            }
            | '-' numexpr %prec UNARY_MINUS  {
                ADD_OP(OP_NEGATE);
            }
            | numexpr GT numexpr  {
                ADD_OP(OP_GT);
            }
            | numexpr GE numexpr  {
                ADD_OP(OP_GE);
            }
            | numexpr LT numexpr  {
                ADD_OP(OP_LT);
            }
            | numexpr LE numexpr  {
                ADD_OP(OP_LE);
            }
            | numexpr EQ numexpr  {
                ADD_OP(OP_EQ);
            }
            | numexpr NE numexpr  {
                ADD_OP(OP_NE);
            }
            | numexpr '&' numexpr {
                ADD_OP(OP_BIT_AND);
            }
            | numexpr '|' numexpr  {
                ADD_OP(OP_BIT_OR);
            }
            | numexpr and numexpr %prec AND {
                ADD_OP(OP_AND); SET_BR_OFF($2, GetPC());
            }
            | numexpr or numexpr %prec OR {
                ADD_OP(OP_OR); SET_BR_OFF($2, GetPC());
            }
            | NOT numexpr {
                ADD_OP(OP_NOT);
            }
            | INCR SYMBOL {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($2); ADD_OP(OP_INCR);
                ADD_OP(OP_DUP); ADD_OP(OP_ASSIGN); ADD_SYM($2);
            }
            | SYMBOL INCR {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($1); ADD_OP(OP_DUP);
                ADD_OP(OP_INCR); ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | DECR SYMBOL {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($2); ADD_OP(OP_DECR);
                ADD_OP(OP_DUP); ADD_OP(OP_ASSIGN); ADD_SYM($2);
            }
            | SYMBOL DECR {
                ADD_OP(OP_PUSH_SYM); ADD_SYM($1); ADD_OP(OP_DUP);
                ADD_OP(OP_DECR); ADD_OP(OP_ASSIGN); ADD_SYM($1);
            }
            | numexpr IN numexpr {
                ADD_OP(OP_IN_ARRAY);
            }
            ;
while:  WHILE {
            $$ = GetPC(); StartLoopAddrList();
        }
        ;
for:    FOR {
            StartLoopAddrList(); $$ = GetPC();
        }
        ;
else:   ELSE {
            ADD_OP(OP_BRANCH); $$ = GetPC(); ADD_BR_OFF(0);
        }
        ;
cond:   /* nothing */ {
            ADD_OP(OP_BRANCH_NEVER); $$ = GetPC(); ADD_BR_OFF(0);
        }
        | numexpr {
            ADD_OP(OP_BRANCH_FALSE); $$ = GetPC(); ADD_BR_OFF(0);
        }
        ;
and:    AND {
            ADD_OP(OP_DUP); ADD_OP(OP_BRANCH_FALSE); $$ = GetPC();
            ADD_BR_OFF(0);
        }
        ;
or:     OR {
            ADD_OP(OP_DUP); ADD_OP(OP_BRANCH_TRUE); $$ = GetPC();
            ADD_BR_OFF(0);
        }
        ;
blank:  /* nothing */
        | blank '\n'
        ;

%% /* User Subroutines Section */


/*
** Parse a null terminated string and create a program from it (this is the
** parser entry point).  The program created by this routine can be
** executed using ExecuteProgram.  Returns program on success, or NULL
** on failure.  If the command failed, the error message is returned
** as a pointer to a static string in msg, and the length of the string up
** to where parsing failed in stoppedAt.
*/
Program *ParseMacro(char *expr, char **msg, char **stoppedAt)
{
    Program *prog;

    BeginCreatingProgram();

    /* call yyparse to parse the string and check for success.  If the parse
       failed, return the error message and string index (the grammar aborts
       parsing at the first error) */
    InPtr = expr;
    if (yyparse()) {
        *msg = ErrMsg;
        *stoppedAt = InPtr;
        FreeProgram(FinishCreatingProgram());
        return NULL;
    }

    /* get the newly created program */
    prog = FinishCreatingProgram();

    /* parse succeeded */
    *msg = "";
    *stoppedAt = InPtr;
    return prog;
}


static int yylex(void)
{
    int i, len;
    Symbol *s;
    static DataValue value = {NO_TAG, {0}};
    static char escape[] = "\\\"ntbrfav";
    static char replace[] = "\\\"\n\t\b\r\f\a\v";

    /* skip whitespace, backslash-newline combinations, and comments, which are
       all considered whitespace */
    for (;;) {
        if (*InPtr == '\\' && *(InPtr + 1) == '\n')
            InPtr += 2;
        else if (*InPtr == ' ' || *InPtr == '\t')
            InPtr++;
        else if (*InPtr == '#')
            while (*InPtr != '\n' && *InPtr != '\0') {
                /* Comments stop at escaped newlines */
                if (*InPtr == '\\' && *(InPtr + 1) == '\n') {
                    InPtr += 2;
                    break;
                }
                InPtr++;
            }        else
            break;
    }


    /* return end of input at the end of the string */
    if (*InPtr == '\0') {
        return 0;
    }

    /* process number tokens */
    if (isdigit((unsigned char)*InPtr))  { /* number */
        char name[28];
        sscanf(InPtr, "%d%n", &value.val.n, &len);
        sprintf(name, "const %d", value.val.n);
        InPtr += len;
        value.tag = INT_TAG;
        if ((yylval.sym=LookupSymbol(name)) == NULL)
            yylval.sym = InstallSymbol(name, CONST_SYM, value);
        return NUMBER;
    }

    /* process symbol tokens.  "define" is a special case not handled
       by this parser, considered end of input.  Another special case
       is action routine names which are allowed to contain '-' despite
       the ambiguity, handled in matchesActionRoutine. */
    if (isalpha((unsigned char)*InPtr) || *InPtr == '$') {
        if ((s=matchesActionRoutine(&InPtr)) == NULL) {
            char symName[MAX_SYM_LEN+1], *p = symName;
            *p++ = *InPtr++;
            while (isalnum((unsigned char)*InPtr) || *InPtr=='_') {
                if (p >= symName + MAX_SYM_LEN)
                    InPtr++;
                else
                    *p++ = *InPtr++;
            }
            *p = '\0';
            if (!strcmp(symName, "while")) return WHILE;
            if (!strcmp(symName, "if")) return IF;
            if (!strcmp(symName, "else")) return ELSE;
            if (!strcmp(symName, "for")) return FOR;
            if (!strcmp(symName, "break")) return BREAK;
            if (!strcmp(symName, "continue")) return CONTINUE;
            if (!strcmp(symName, "return")) return RETURN;
            if (!strcmp(symName, "in")) return IN;
            if (!strcmp(symName, "$args")) return ARG_LOOKUP;
            if (!strcmp(symName, "delete") && follow_non_whitespace('(', SYMBOL, DELETE) == DELETE) return DELETE;
            if (!strcmp(symName, "define")) {
                InPtr -= 6;
                return 0;
            }
            if ((s=LookupSymbol(symName)) == NULL) {
                s = InstallSymbol(symName, symName[0]=='$' ?
                        (((symName[1] > '0' && symName[1] <= '9') && symName[2] == 0) ?
                        ARG_SYM : GLOBAL_SYM) : LOCAL_SYM, value);
                s->value.tag = NO_TAG;
            }
        }
        yylval.sym = s;
        return SYMBOL;
    }

    /* process quoted strings w/ embedded escape sequences */
    if (*InPtr == '\"') {
        char string[MAX_STRING_CONST_LEN], *p = string;
        InPtr++;
        while (*InPtr != '\0' && *InPtr != '\"' && *InPtr != '\n') {
            if (p >= string + MAX_STRING_CONST_LEN) {
                InPtr++;
                continue;
            }
            if (*InPtr == '\\') {
                InPtr++;
                if (*InPtr == '\n') {
                    InPtr++;
                    continue;
                }
                for (i=0; escape[i]!='\0'; i++) {
                    if (escape[i] == '\0') {
                        *p++= *InPtr++;
                        break;
                    } else if (escape[i] == *InPtr) {
                        *p++ = replace[i];
                        InPtr++;
                        break;
                    }
                }
            } else
                *p++= *InPtr++;
        }
        *p = '\0';
        InPtr++;
        yylval.sym = InstallStringConstSymbol(string);
        return STRING;
    }

    /* process remaining two character tokens or return single char as token */
    switch(*InPtr++) {
    case '>':   return follow('=', GE, GT);
    case '<':   return follow('=', LE, LT);
    case '=':   return follow('=', EQ, '=');
    case '!':   return follow('=', NE, NOT);
    case '+':   return follow2('+', INCR, '=', ADDEQ, '+');
    case '-':   return follow2('-', DECR, '=', SUBEQ, '-');
    case '|':   return follow2('|', OR, '=', OREQ, '|');
    case '&':   return follow2('&', AND, '=', ANDEQ, '&');
    case '*':   return follow2('*', POW, '=', MULEQ, '*');
    case '/':   return follow('=', DIVEQ, '/');
    case '%':   return follow('=', MODEQ, '%');
    case '^':   return POW;
    default:    return *(InPtr-1);
    }
}

/*
** look ahead for >=, etc.
*/
static int follow(char expect, int yes, int no)
{
    if (*InPtr++ == expect)
        return yes;
    InPtr--;
    return no;
}
static int follow2(char expect1, int yes1, char expect2, int yes2, int no)
{
    char next = *InPtr++;
    if (next == expect1)
        return yes1;
    if (next == expect2)
        return yes2;
    InPtr--;
    return no;
}

static int follow_non_whitespace(char expect, int yes, int no)
{
    char *localInPtr = InPtr;

    while (1) {
        if (*localInPtr == ' ' || *localInPtr == '\t') {
            ++localInPtr;
        }
        else if (*localInPtr == '\\' && *(localInPtr + 1) == '\n') {
            localInPtr += 2;
        }
        else if (*localInPtr == expect) {
            return(yes);
        }
        else {
            return(no);
        }
    }
}

/*
** Look (way) ahead for hyphenated routine names which begin at inPtr.  A
** hyphenated name is allowed if it is pre-defined in the global symbol
** table.  If a matching name exists, returns the symbol, and update "inPtr".
**
** I know this is horrible language design, but existing nedit action routine
** names contain hyphens.  Handling them here in the lexical analysis process
** is much easier than trying to deal with it in the parser itself.  (sorry)
*/
static Symbol *matchesActionRoutine(char **inPtr)
{
    char *c, *symPtr;
    int hasDash = False;
    char symbolName[MAX_SYM_LEN+1];
    Symbol *s;

    symPtr = symbolName;
    for (c = *inPtr; isalnum((unsigned char)*c) || *c=='_' ||
            ( *c=='-' && isalnum((unsigned char)(*(c+1)))); c++) {
        if (*c == '-')
            hasDash = True;
        *symPtr++ = *c;
    }
    if (!hasDash)
        return NULL;
    *symPtr = '\0';
    s = LookupSymbol(symbolName);
    if (s != NULL)
        *inPtr = c;
    return s;
}

/*
** Called by yacc to report errors (just stores for returning when
** parsing is aborted.  The error token action is to immediate abort
** parsing, so this message is immediately reported to the caller
** of ParseExpr)
*/
static int yyerror(char *s)
{
    ErrMsg = s;
    return 0;
}