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<h1> words/number.asm </h1> |
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<p> |
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<a href="../WordList.en.html">Jump to Vocabulary</a> |
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<pre> |
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; (addr -- n ) Numeric IO |
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; R( -- ) |
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; convert a word to a number, throw exception -1 on error |
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VE_NUMBER: |
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.db $06, "number",0 |
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.dw VE_HEAD |
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.set VE_HEAD = VE_NUMBER |
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XT_NUMBER: |
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.dw DO_COLON |
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PFA_NUMBER: |
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; sign flag |
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.dw XT_DOLITERAL |
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.dw 1 ; ( -- addr 1) |
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.dw XT_ZERO ; ( -- addr 1 0) |
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.dw XT_ROT ; ( -- 1 0 addr) |
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.dw XT_COUNT ; ( -- 1 0 addr' len) |
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.dw XT_ZERO |
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.dw XT_DODO |
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.dw PFA_NUMBER6 |
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PFA_NUMBER1: ; ( n addr -- ) |
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.dw XT_DUP |
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.dw XT_I |
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.dw XT_PLUS |
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.dw XT_CFETCH |
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; now check for +/- signs |
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.dw XT_DUP |
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.dw XT_DOLITERAL |
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.dw $2d ; '-' |
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.dw XT_EQUAL |
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.dw XT_DOCONDBRANCH |
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.dw PFA_NUMBER2 |
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.dw XT_DROP |
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; replace the sign flag |
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.dw XT_ROT |
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.dw XT_DROP |
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.dw XT_DOLITERAL |
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.dw -1 |
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.dw XT_ROT |
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.dw XT_ROT |
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.dw XT_DOBRANCH |
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.dw PFA_NUMBER4 |
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PFA_NUMBER2: |
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.dw XT_BASE |
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.dw XT_FETCH |
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.dw XT_DIGIT |
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.dw XT_EQUALZERO |
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; check for non number characters and stop converting if found |
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.dw XT_DOCONDBRANCH |
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.dw PFA_NUMBER3 |
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.dw XT_DOLITERAL |
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.dw -13 |
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.dw XT_THROW |
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PFA_NUMBER3: |
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.dw XT_ROT |
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.dw XT_BASE |
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.dw XT_FETCH |
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.dw XT_MUL |
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.dw XT_PLUS |
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.dw XT_SWAP |
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PFA_NUMBER4: |
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.dw XT_DOLOOP |
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.dw PFA_NUMBER1 |
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PFA_NUMBER6: |
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.dw XT_DROP |
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; incorporate sign into number |
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.dw XT_SWAP |
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.dw XT_LESSZERO |
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.dw XT_DOCONDBRANCH |
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.dw PFA_NUMBER5 |
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.dw XT_NEGATE |
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PFA_NUMBER5: |
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.dw XT_EXIT |
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</pre> |
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