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Add parsing routines for bare commands and REM statements
author William Astle <lost@l-w.ca>
date Tue, 09 Jan 2024 22:47:11 -0700
parents ac183a519439
children d5886daa4f65
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1 *pragmapush list
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2 *pragma list
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3 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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4 ; This is the overall parsing package. This is responsible for converting program text into the internal byte code and
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5 ; reporting any syntax errors and anything else reasonably detectable at parse time without having overly complicated
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6 ; code analysis.
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7 ;
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8 ; This is a recursive descent parser.
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9 ;
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10 ; Entry:
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11 ; X Points to the text to encode
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12 ; B Nonzero to prevent generating any output (error check/length calculation only)
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13 ;
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14 ; Exit:
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15 ; U Points to the encoded line
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16 ; D Length of the encoded line
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17 ; CC.C clear
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18
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19 ; Error Exit:
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20 ; B Error code
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21 ; U Offset to error input
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22 ; CC.C set
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23 parse stb parse_noout ; save no-output flag
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24 leay ,x ; save input pointer in a less useful register
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25 ldu freestart ; point to start of free memory where we will build the output
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26 pshs u ; save original free memory location
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27 parse_nextstmt jsr parse_nexttok ; fetch the next token, return type in D
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28 bcc parse0 ; brif we succeeded in parsing a token
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29 parse_error puls u ; restore original free memory location - deallocate any encoding
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30 stu freestart
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31 ldu parse_tokenst ; get start location we started parsing the token at
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32 rts ; return error condition
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33 parse0 ldx #parsetab_cmd ; point to jump table for token type handler
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34 cmpb #token_stmtsep ; is it a statement separator?
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35 beq parse_nextstmt ; brif so - we can just skip it
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36 parse1 cmpb ,x ; did we match a valid command token?
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37 beq parse3 ; brif so
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38 leax 3,x ; move to next entry
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39 cmpx #parsetab_cmde ; end of table?
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40 blo parse1 ; brif not
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41 parse2 ldb #err_sn ; flag syntax error
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42 bra parse_error ; and return the error
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43 parse3 jsr [1,x] ; call the handler
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44 bcs parse_error ; brif the handler indicated error
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45 bsr parse_curtoken ; fetch the token we left off on
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46 cmpb #token_eot ; end of input?
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47 bne parse4 ; brif not
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48 ldb #bc_eol ; stash an end of line op
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49 bsr parse_write
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50 bcs parse_error ; brif we errored out writing to the result (OM?)
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51 tfr u,d ; calculate the length of the result
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52 subd ,s
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53 puls u,pc ; get pointer to start of encoded result and return (C is already clear)
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54 parse4 cmpb #token_stmtsep ; statement separator?
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55 beq parse_nextstmt ; brif so - do another statement
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56 cmpb #token_remabbr ; ' token?
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57 beq parse0 ; brif so - parse it as a new statement
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58 bra parse2 ; raise a syntax error
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59 parse_write lda parse_noout ; are we doing output?
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60 beq parse_write0 ; brif so
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61 leau 1,u ; just count up the output and don't do anything
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62 rts
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63 parse_write0 leax -stackheadroom,s ; calculate bottom of stack with headroom
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64 cmpx freestart ; did the stack run into the end of the output?
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65 bhs parse_write1 ; brif not - we're good
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66 ldb #err_om ; raise out of memory error, C already set from comparison
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67 rts
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68 parse_write1 stb ,u+ ; save output byte
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69 stu freestart ; save new to of used memory
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70 list_noop
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71 parse_noop rts ; return all clear - C clear from comparison above
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72 parse_curtoken ldb parse_curtok ; fetch token code of current token
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73 rts
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74 parse_tokerr comb ; flag error - unexpected token
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75 ldb #err_sn ; raise syntax error
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76 rts
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77 parse_nextchar lda ,y ; at end of input already?
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78 beq parse_curchar ; brif so
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79 leay 1,y ; move to next input character
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80 parse_curchar lda ,y ; fetch input character
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81 rts
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82 parse_nexttok bsr parse_curchar ; fetch current input
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83 beq parse_nexttok1 ; brif end of input
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84 parse_nexttok0 cmpa #0x20 ; space?
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85 bne parse_nexttok2 ; brif not
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86 bsr parse_nextchar ; eat the space
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87 bne parse_nexttok0 ; brif not end of input
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88 parse_nexttok1 ldb #token_eot ; flag end of input
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89 bra parse_nexttok6 ; go return it
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90 parse_nexttok2 sty parse_tokenst ; save start of current token after skipping spaces
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91 bsr parse_toupper ; make sure we have upper case letters for matching
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92 ldx #parse_wt ; point to keyword parsing table
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93 bsr parse_wordtab ; go see if we have a match in the keyword table
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94 bcc parse_nexttok6 ; brif we do - return it
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95 ldy parse_tokenst ; return to the start of the token - pointer probably clobbered
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96 bsr parse_curchar ; get back input character (may have been clobbered)
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97 cmpa #'. ; leading decimal?
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98 beq parse_nexttok3 ; brif so - parse number
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99 cmpa #'0 ; is it a digit
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100 blo parse_nexttok10 ; brif not
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101 cmpa #'9 ; is it still a digit?
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102 bhi parse_nexttok10 ; brif not
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103 parse_nexttok3 jmp parse_number ; go parse a number
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104 parse_nexttok6 stb parse_curtok ; save token type
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105 leay 1,y ; eat the input character
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106 clra ; clear C to indicate no error (and clear Z also)
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107 rts
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108 parse_nexttok10 cmpa #'A ; is it alpha?
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109 blo parse_nexttok11 ; brif not
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110 cmpa #'Z ; is it still alpha?
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111 bls parse_nexttok12 ; brif so
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112 parse_nexttok11 comb ; flag error - unrecognized token
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113 ldb #token_error
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114 rts
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115 parse_nexttok12 bsr parse_nextcharu ; fetch next input character
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116 cmpa #'0 ; is it alphanumeric?
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117 blo parse_nexttok13 ; brif not
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118 cmpa #'9 ; is it numeric?
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119 bls parse_nexttok12 ; brif so - keep skipping it
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120 cmpa #'A ; is it alpha?
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121 blo parse_nexttok13 ; brif not
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122 cmpa #'Z ; is it still alpha?
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123 bls parse_nexttok12 ; brif so - keep skipping it
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124 parse_nexttok13 tfr y,d ; calculate length of identifier
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125 subd parse_tokenst
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126 std val0+val.strlen ; save it for reference
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127 ldb #token_ident ; indicate an identifier (variable name, etc.)
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128 rts ; return result (C will be clear from SUBD above)
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129 parse_nextcharu bsr parse_nextchar ; fetch next input character
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130 beq parse_toupper0 ; brif end of input
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131 parse_toupper cmpa #'a ; is it lower case alpha?
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132 blo parse_toupper0 ; brif not
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133 cmpa #'z ; is it still lower case alpha?
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134 bhi parse_toupper0 ; brif not
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135 suba #0x20 ; adjust to upper case alpha
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136 parse_toupper0 rts ; Z only set here if input was zero entering from parse_nextcharu
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137 parse_number jmp parse_tokerr
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138 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
127
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139 ; Parse a statement that consists of just the command token
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140 parse_cmdsingle equ parse_write ; just write the token out and bail
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141 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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142 ; Parse a REM or ' statement. We just copy the comment out after the REM or ' token.
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143 parse_rem jsr parse_write ; write the token/character out
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144 ldb ,y+ ; get next input character
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145 bne parse_rem ; brif not at the end of the input
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146 ldb #token_eot ; flag end of input for mainline parser
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147 stb parse_curtok
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148 rts ; return, pass back the C result from parse_write
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149 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
123
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150 ; This routine parses tokens using the table at parse_wordtab. The table is structured as follows:
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151 ;
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152 ; * two bytes which contain the length of the table less the two bytes for this length value
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153 ; * a sequence of entries consisting of a single byte matching character and a token code followed
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154 ; by an optional sub table, structured exactly the same way.
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155 ;
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156 ; The optional subtable will be present if the token code is token_eot
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157 ;
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158 ; If the character match is negative, it means a lookahead failed. The negative value is the number
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159 ; of characters to unget and the token code is the token value to return. No other entries after this
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160 ; in a table will be considered since thie negative match is a global match.
121
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161 ;
123
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162 ; When a token_eot match is found, if there are no further characters in the input, the match is
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163 ; determined to be invalid and processing continues with the next entry.
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164 parse_wordtab0 leas 3,s ; clean up stack for sub table handling
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165 parse_wordtab pshs a,x ; save input character and start of table
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166 ldd ,x++ ; get length of this table
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167 addd 1,s ; calculate the address of the end of the table
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168 std 1,s ; save end address for comparison later
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169 lda ,s ; get back input character
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170 parse_wordtab1 ldb 1,x ; fetch token code for this entry
123
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171 cmpa ,x++ ; does this entry match?
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172 bne parse_wordtab4 ; brif not
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173 cmpb #token_eot ; is it indicating a sub table?
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174 bne parse_wordtab6 ; brif not
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175 bsr parse_nextcharu ; fetch next input character (for sub table match)
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176 bne parse_wordtab0 ; brif we are going to check the sub table
126
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177 parse_wordtab2 ldd ,x ; fetch length of sub table
123
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178 leax d,x ; move past sub table
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179 parse_wordtab3 lda ,s ; get back input character
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180 cmpx 1,s ; are we at the end of the table?
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181 blo parse_wordtab1 ; brif not - check another entry
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182 comb ; indicate no match
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183 puls a,x,pc ; clean up stack and return
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184 parse_wordtab4 lda -2,x ; get the match character
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185 bmi parse_wordtab5 ; brif negative - lookahead fail
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186 cmpb #token_eot ; is there a sub table to skip?
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187 beq parse_wordtab2 ; brif so - skip sub table
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188 bra parse_wordtab3 ; otherwise just move to the next entry
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189 parse_wordtab5 leay a,y ; move back the specified number of characters
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190 parse_wordtab6 clra ; clear C to indicate a match
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191 puls a,x,pc ; clean up stack and return
126
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192 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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193 ; Convert a token number back to its keyword. This will use the same table used by parse_wordtab. Enter with a character
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194 ; output routine pointer in U which takes the character in A. The routine can assume that Y is preserved. Will return
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195 ; with C set if the token does not exist in the word table and clear otherwise.
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196 parse_wtdc pshs u ; save routine pointer
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197 ldu #strbuff+20 ; point to temporary string buffer
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198 clr ,-u ; put a NUL at the end of the string
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199 ldx #parse_wt ; point to keyword parse table
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200 bsr parse_wtdc2 ; call the tree walker function
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201 bcc parse_wtdc1 ; brif we do have a match
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202 puls u,pc ; clean stack and return
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203 parse_wtdc0 jsr [,s] ; output the character
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204 parse_wtdc1 lda ,u+ ; get output byte
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205 bne parse_wtdc0 ; brif we're not at the end yet
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206 clra ; make sure C is clear
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207 puls u,pc ; clean stack and return
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208 parse_wtdc2 pshs a,x ; save the token match value and the table pointer
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209 ldd ,x++ ; get table length
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210 addd 1,s ; calculate end address
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211 std 1,s ; save it
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212 parse_wtdc3 ldd ,x++ ; get this table entry
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213 bmi parse_wtdc6 ; brif it's a backtracking entry - skip it
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214 cmpa ,s ; does the token match here?
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215 bne parse_wtdc5 ; brif not
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216 parse_wtdc4 sta ,-y ; add the character to the output buffer
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217 puls a,x,pc ; return up the call stack - C is clear from CMPA above
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218 parse_wtdc5 cmpb #token_eot ; does this entry have a sub table?
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219 bne parse_wtdc6 ; brif not
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220 pshs a ; save the matched character
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221 lda 1,s ; get back the token we need
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222 bsr parse_wtdc2 ; go handle the sub table
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223 puls a ; get back the matched character
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224 bcc parse_wtdc6 ; brif it did match - record it and return
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225 parse_wtdc6 cmpx 1,s ; are we at the end of this table?
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226 bne parse_wtdc3 ; brif not - handle another table entry
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227 coma ; make sure C is set for no match
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228 puls a,x,pc ; clean up stack and return
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229 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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230 ; This table defines the various handler routines for the various bytecode tokens. Each token is defined as follows:
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231 ; parse_tokdefT <sym>,<parse>,<list>,<exec>
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232 ; where:
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233 ; T: c for command, f for function, p for particle
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234 ; <sym>: the symbol name without the "token_" prefix
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235 ; <parse>: parse handler for the type, ignored for particles
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236 ; <list>: list handler for the type, ingored for particles
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237 ; <exec>: execution handler for the type, ignored for particles
121
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238 *pragmapush list
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239 *pragma nolist
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240 __toknump set 0
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241 __toknumc set 0x40
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242 __toknumf set 0xc0
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243 setstr __cmdparset=""
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244 setstr __cmdlistt=""
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245 setstr __cmdexect=""
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246 setstr __fnparset=""
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247 setstr __fnlistt=""
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248 setstr __fnexect=""
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249 parse_tokendefp macro noexpand
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250 token_\1 equ __toknump
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251 __toknump set __toknump+1
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252 endm
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253 parse_tokendefc macro noexpand
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254 token_\1 equ __toknumc
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255 __toknumc set __toknumc+1
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256 ifstr ne,"{2}",""
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257 setstr __cmdparset="%(__cmdparset)\tfcb\ttoken_\1\n\tfdb {2}\n"
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258 endc
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259 ifstr ne,"{3}",""
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260 setstr __cmdlistt="%(__cmdlistt)\tfcb\ttoken_\1\n\tfdb {3}\n"
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261 endc
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262 ifstr ne,"{4}",""
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263 setstr __cmdexect="%(__cmdexect)\tfdb {3}\n"
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264 else
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265 setstr __cmdexect="%(__cmdexect)\tfdb SNERROR\n"
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266 endc
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267 endm
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268 parse_tokendeff macro noexpand
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269 token_\1 equ __toknumf
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270 __toknumf set __toknumf+1
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271 ifstr ne,"{2}",""
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272 setstr __fnparset="%(__fnparset)\tfcb\ttoken_\1\n\tfdb {2}\n"
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273 endc
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274 ifstr ne,"{3}",""
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275 setstr __fnlistt="%(__fnlistt)\tfcb\ttoken_\1\n\tfdb {3}\n"
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276 endc
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277 ifstr ne,"{4}",""
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278 setstr __fnexect="%(__fnexect)\tfdb {3}\n"
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279 else
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280 setstr __fnexect="%(__fnexect)\tfdb SNERROR\n"
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281 endc
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282 endm
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283 token_cmdparse macro
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284 *pragmapush nolist
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285 *pragma nolist
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286 includestr "%(__cmdparset)"
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287 *pragmapop nolist
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288 endm
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289 token_cmdlist macro
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290 *pragmapush nolist
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291 *pragma nolist
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292 includestr "%(__cmdlistt)"
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293 *pragmapop nolist
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294 endm
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295 token_cmdexec macro
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296 *pragmapush nolist
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297 *pragma nolist
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298 includestr "%(__cmdexect)"
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299 token__maxcmd equ __toknumc-1
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300 *pragmapop nolist
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301 endm
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302 token_fnparse macro
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303 *pragmapush nolist
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304 *pragma nolist
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305 includestr "%(__fnparset)"
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306 *pragmapop nolist
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307 endm
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308 token_fnlist macro
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309 *pragmapush nolist
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310 *pragma nolist
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311 includestr "%(__fnlistt)"
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312 *pragmapop nolist
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313 endm
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314 token_fnexec macro
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315 *pragmapush nolist
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316 *pragma nolist
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317 includestr "%(__fnexect)"
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318 token__maxfn equ __toknumf-1
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319 *pragmapop nolist
121
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320 endm
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321 *pragmapop list
126
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322 parse_tokendefp error ; Used to mark errors; should always be first so it's token #0
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323 parse_tokendefp eot ; End of input marker or special handling in word tables
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324 parse_tokendefp stmtsep ; statement separator
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325 parse_tokendefp times ; times (multiplication) operator (*)
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326 parse_tokendefp plus ; addition operator
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327 parse_tokendefp divide ; division operator (/)
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328 parse_tokendefp minus ; subtraction operator
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329 parse_tokendefp exp ; exponentiation operator (^)
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330 parse_tokendefp lt ; less than operator
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331 parse_tokendefp le ; less than or equal operateor
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332 parse_tokendefp gt ; greater than operator
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333 parse_tokendefp ge ; greater than or equal operator
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334 parse_tokendefp eq ; equality operator
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335 parse_tokendefp ne ; inequality operator
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336 parse_tokendefp not ; boolean NOT operator
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337 parse_tokendefp and ; boolean AND operator
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338 parse_tokendefp or ; boolean OR operator
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339 parse_tokendefp bang ; exclamation mark
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340 parse_tokendefp hash ; number sign
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341 parse_tokendefp dollar ; dollar sign (string sigil)
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342 parse_tokendefp percent ; percent sign (integer sigil)
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343 parse_tokendefp amp ; ampersand
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344 parse_tokendefp oparen ; opening paren
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345 parse_tokendefp cparen ; closing paren
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346 parse_tokendefp sep ; comma (separator)
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347 parse_tokendefp semi ; semicolon
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348 parse_tokendefp at ; @ symbol
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349 parse_tokendefp ident ; identifier (has special parsing)
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350 parse_tokendefp else ; ELSE
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351 parse_tokendefp then ; THEN
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352 parse_tokendefp to ; TO
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353 parse_tokendefp sub ; SUB
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354 parse_tokendefp as ; AS
121
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355
127
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356 parse_tokendefc remabbr,parse_rem,list_noop,exec_noop ; abbreviated REM (')
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357 parse_tokendefc rem,parse_rem,list_noop,exec_noop ; REM
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358 parse_tokendefc return,parse_cmdsingle,parse_noop,parse_noop ; RETURN
126
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359 parse_tokendefc run,parse_noop,parse_noop,parse_noop ; RUN
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360 parse_tokendefc data,parse_noop,parse_noop,parse_noop ; DATA
127
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361 parse_tokendefc end,parse_cmdsingle,parse_noop,parse_noop ; END
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362 parse_tokendefc stop,parse_cmdsingle,parse_noop,parse_noop ; STOP
126
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363 parse_tokendefc let,parse_noop,parse_noop,parse_noop ; LET
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364 parse_tokendefc list,parse_noop,parse_noop,parse_noop ; LIST
127
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365 parse_tokendefc new,parse_cmdsingle,parse_noop,parse_noop ; NEW
126
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366 parse_tokendefc print,parse_noop,parse_noop,parse_noop ; PRINT
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367 parse_tokendefc pop,parse_cmdsingle,parse_noop,parse_noop ; POP
126
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368 parse_tokendefc goto,parse_noop,parse_noop,parse_noop ; GOTO
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369 parse_tokendefc gosub,parse_noop,parse_noop,parse_noop ; GOSUB
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370 parse_tokendefc go,parse_noop,parse_noop,parse_noop ; GO
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371
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372 parse_tokendeff asc,parse_noop,parse_noop,parse_noop ; ASC()
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373 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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374 ; Parse handling tables
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375 parsetab_cmd token_cmdparse
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376 parsetab_cmde
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377 parsetab_fn token_fnparse
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378 parsetab_fne
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379 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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380 ; List handling tables
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381 listtab_cmd token_cmdlist
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382 listtab_cmde
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383 listtab_fn token_fnlist
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384 listtab_fne
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385 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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386 ; Execution handling tables
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387 exectab_cmd token_cmdexec
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388 exectab_fn token_fnexec
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389 *pragmapop list